Initial commit

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/Dockerfile

@@ -0,0 +1,18 @@
+FROM composer:latest as setup
+
+RUN mkdir /guzzle
+
+WORKDIR /guzzle
+
+RUN set -xe \
+    && composer init --name=guzzlehttp/test --description="Simple project for testing Guzzle scripts" --author="Márk Sági-Kazár <mark.sagikazar@gmail.com>" --no-interaction \
+    && composer require guzzlehttp/guzzle
+
+
+FROM php:7.3
+
+RUN mkdir /guzzle
+
+WORKDIR /guzzle
+
+COPY --from=setup /guzzle /guzzle

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2011-2018 Michael Dowling, https://github.com/mtdowling <mtdowling@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Client.php

@@ -0,0 +1,422 @@
+<?php
+namespace GuzzleHttp;
+
+use GuzzleHttp\Cookie\CookieJar;
+use GuzzleHttp\Promise;
+use GuzzleHttp\Psr7;
+use Psr\Http\Message\UriInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * @method ResponseInterface get(string|UriInterface $uri, array $options = [])
+ * @method ResponseInterface head(string|UriInterface $uri, array $options = [])
+ * @method ResponseInterface put(string|UriInterface $uri, array $options = [])
+ * @method ResponseInterface post(string|UriInterface $uri, array $options = [])
+ * @method ResponseInterface patch(string|UriInterface $uri, array $options = [])
+ * @method ResponseInterface delete(string|UriInterface $uri, array $options = [])
+ * @method Promise\PromiseInterface getAsync(string|UriInterface $uri, array $options = [])
+ * @method Promise\PromiseInterface headAsync(string|UriInterface $uri, array $options = [])
+ * @method Promise\PromiseInterface putAsync(string|UriInterface $uri, array $options = [])
+ * @method Promise\PromiseInterface postAsync(string|UriInterface $uri, array $options = [])
+ * @method Promise\PromiseInterface patchAsync(string|UriInterface $uri, array $options = [])
+ * @method Promise\PromiseInterface deleteAsync(string|UriInterface $uri, array $options = [])
+ */
+class Client implements ClientInterface
+{
+    /** @var array Default request options */
+    private $config;
+
+    /**
+     * Clients accept an array of constructor parameters.
+     *
+     * Here's an example of creating a client using a base_uri and an array of
+     * default request options to apply to each request:
+     *
+     *     $client = new Client([
+     *         'base_uri'        => 'http://www.foo.com/1.0/',
+     *         'timeout'         => 0,
+     *         'allow_redirects' => false,
+     *         'proxy'           => '192.168.16.1:10'
+     *     ]);
+     *
+     * Client configuration settings include the following options:
+     *
+     * - handler: (callable) Function that transfers HTTP requests over the
+     *   wire. The function is called with a Psr7\Http\Message\RequestInterface
+     *   and array of transfer options, and must return a
+     *   GuzzleHttp\Promise\PromiseInterface that is fulfilled with a
+     *   Psr7\Http\Message\ResponseInterface on success. "handler" is a
+     *   constructor only option that cannot be overridden in per/request
+     *   options. If no handler is provided, a default handler will be created
+     *   that enables all of the request options below by attaching all of the
+     *   default middleware to the handler.
+     * - base_uri: (string|UriInterface) Base URI of the client that is merged
+     *   into relative URIs. Can be a string or instance of UriInterface.
+     * - **: any request option
+     *
+     * @param array $config Client configuration settings.
+     *
+     * @see \GuzzleHttp\RequestOptions for a list of available request options.
+     */
+    public function __construct(array $config = [])
+    {
+        if (!isset($config['handler'])) {
+            $config['handler'] = HandlerStack::create();
+        } elseif (!is_callable($config['handler'])) {
+            throw new \InvalidArgumentException('handler must be a callable');
+        }
+
+        // Convert the base_uri to a UriInterface
+        if (isset($config['base_uri'])) {
+            $config['base_uri'] = Psr7\uri_for($config['base_uri']);
+        }
+
+        $this->configureDefaults($config);
+    }
+
+    public function __call($method, $args)
+    {
+        if (count($args) < 1) {
+            throw new \InvalidArgumentException('Magic request methods require a URI and optional options array');
+        }
+
+        $uri = $args[0];
+        $opts = isset($args[1]) ? $args[1] : [];
+
+        return substr($method, -5) === 'Async'
+            ? $this->requestAsync(substr($method, 0, -5), $uri, $opts)
+            : $this->request($method, $uri, $opts);
+    }
+
+    public function sendAsync(RequestInterface $request, array $options = [])
+    {
+        // Merge the base URI into the request URI if needed.
+        $options = $this->prepareDefaults($options);
+
+        return $this->transfer(
+            $request->withUri($this->buildUri($request->getUri(), $options), $request->hasHeader('Host')),
+            $options
+        );
+    }
+
+    public function send(RequestInterface $request, array $options = [])
+    {
+        $options[RequestOptions::SYNCHRONOUS] = true;
+        return $this->sendAsync($request, $options)->wait();
+    }
+
+    public function requestAsync($method, $uri = '', array $options = [])
+    {
+        $options = $this->prepareDefaults($options);
+        // Remove request modifying parameter because it can be done up-front.
+        $headers = isset($options['headers']) ? $options['headers'] : [];
+        $body = isset($options['body']) ? $options['body'] : null;
+        $version = isset($options['version']) ? $options['version'] : '1.1';
+        // Merge the URI into the base URI.
+        $uri = $this->buildUri($uri, $options);
+        if (is_array($body)) {
+            $this->invalidBody();
+        }
+        $request = new Psr7\Request($method, $uri, $headers, $body, $version);
+        // Remove the option so that they are not doubly-applied.
+        unset($options['headers'], $options['body'], $options['version']);
+
+        return $this->transfer($request, $options);
+    }
+
+    public function request($method, $uri = '', array $options = [])
+    {
+        $options[RequestOptions::SYNCHRONOUS] = true;
+        return $this->requestAsync($method, $uri, $options)->wait();
+    }
+
+    public function getConfig($option = null)
+    {
+        return $option === null
+            ? $this->config
+            : (isset($this->config[$option]) ? $this->config[$option] : null);
+    }
+
+    private function buildUri($uri, array $config)
+    {
+        // for BC we accept null which would otherwise fail in uri_for
+        $uri = Psr7\uri_for($uri === null ? '' : $uri);
+
+        if (isset($config['base_uri'])) {
+            $uri = Psr7\UriResolver::resolve(Psr7\uri_for($config['base_uri']), $uri);
+        }
+
+        return $uri->getScheme() === '' && $uri->getHost() !== '' ? $uri->withScheme('http') : $uri;
+    }
+
+    /**
+     * Configures the default options for a client.
+     *
+     * @param array $config
+     */
+    private function configureDefaults(array $config)
+    {
+        $defaults = [
+            'allow_redirects' => RedirectMiddleware::$defaultSettings,
+            'http_errors'     => true,
+            'decode_content'  => true,
+            'verify'          => true,
+            'cookies'         => false
+        ];
+
+        // Use the standard Linux HTTP_PROXY and HTTPS_PROXY if set.
+
+        // We can only trust the HTTP_PROXY environment variable in a CLI
+        // process due to the fact that PHP has no reliable mechanism to
+        // get environment variables that start with "HTTP_".
+        if (php_sapi_name() == 'cli' && getenv('HTTP_PROXY')) {
+            $defaults['proxy']['http'] = getenv('HTTP_PROXY');
+        }
+
+        if ($proxy = getenv('HTTPS_PROXY')) {
+            $defaults['proxy']['https'] = $proxy;
+        }
+
+        if ($noProxy = getenv('NO_PROXY')) {
+            $cleanedNoProxy = str_replace(' ', '', $noProxy);
+            $defaults['proxy']['no'] = explode(',', $cleanedNoProxy);
+        }
+
+        $this->config = $config + $defaults;
+
+        if (!empty($config['cookies']) && $config['cookies'] === true) {
+            $this->config['cookies'] = new CookieJar();
+        }
+
+        // Add the default user-agent header.
+        if (!isset($this->config['headers'])) {
+            $this->config['headers'] = ['User-Agent' => default_user_agent()];
+        } else {
+            // Add the User-Agent header if one was not already set.
+            foreach (array_keys($this->config['headers']) as $name) {
+                if (strtolower($name) === 'user-agent') {
+                    return;
+                }
+            }
+            $this->config['headers']['User-Agent'] = default_user_agent();
+        }
+    }
+
+    /**
+     * Merges default options into the array.
+     *
+     * @param array $options Options to modify by reference
+     *
+     * @return array
+     */
+    private function prepareDefaults(array $options)
+    {
+        $defaults = $this->config;
+
+        if (!empty($defaults['headers'])) {
+            // Default headers are only added if they are not present.
+            $defaults['_conditional'] = $defaults['headers'];
+            unset($defaults['headers']);
+        }
+
+        // Special handling for headers is required as they are added as
+        // conditional headers and as headers passed to a request ctor.
+        if (array_key_exists('headers', $options)) {
+            // Allows default headers to be unset.
+            if ($options['headers'] === null) {
+                $defaults['_conditional'] = null;
+                unset($options['headers']);
+            } elseif (!is_array($options['headers'])) {
+                throw new \InvalidArgumentException('headers must be an array');
+            }
+        }
+
+        // Shallow merge defaults underneath options.
+        $result = $options + $defaults;
+
+        // Remove null values.
+        foreach ($result as $k => $v) {
+            if ($v === null) {
+                unset($result[$k]);
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Transfers the given request and applies request options.
+     *
+     * The URI of the request is not modified and the request options are used
+     * as-is without merging in default options.
+     *
+     * @param RequestInterface $request
+     * @param array            $options
+     *
+     * @return Promise\PromiseInterface
+     */
+    private function transfer(RequestInterface $request, array $options)
+    {
+        // save_to -> sink
+        if (isset($options['save_to'])) {
+            $options['sink'] = $options['save_to'];
+            unset($options['save_to']);
+        }
+
+        // exceptions -> http_errors
+        if (isset($options['exceptions'])) {
+            $options['http_errors'] = $options['exceptions'];
+            unset($options['exceptions']);
+        }
+
+        $request = $this->applyOptions($request, $options);
+        $handler = $options['handler'];
+
+        try {
+            return Promise\promise_for($handler($request, $options));
+        } catch (\Exception $e) {
+            return Promise\rejection_for($e);
+        }
+    }
+
+    /**
+     * Applies the array of request options to a request.
+     *
+     * @param RequestInterface $request
+     * @param array            $options
+     *
+     * @return RequestInterface
+     */
+    private function applyOptions(RequestInterface $request, array &$options)
+    {
+        $modify = [
+            'set_headers' => [],
+        ];
+
+        if (isset($options['headers'])) {
+            $modify['set_headers'] = $options['headers'];
+            unset($options['headers']);
+        }
+
+        if (isset($options['form_params'])) {
+            if (isset($options['multipart'])) {
+                throw new \InvalidArgumentException('You cannot use '
+                    . 'form_params and multipart at the same time. Use the '
+                    . 'form_params option if you want to send application/'
+                    . 'x-www-form-urlencoded requests, and the multipart '
+                    . 'option to send multipart/form-data requests.');
+            }
+            $options['body'] = http_build_query($options['form_params'], '', '&');
+            unset($options['form_params']);
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\_caseless_remove(['Content-Type'], $options['_conditional']);
+            $options['_conditional']['Content-Type'] = 'application/x-www-form-urlencoded';
+        }
+
+        if (isset($options['multipart'])) {
+            $options['body'] = new Psr7\MultipartStream($options['multipart']);
+            unset($options['multipart']);
+        }
+
+        if (isset($options['json'])) {
+            $options['body'] = \GuzzleHttp\json_encode($options['json']);
+            unset($options['json']);
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\_caseless_remove(['Content-Type'], $options['_conditional']);
+            $options['_conditional']['Content-Type'] = 'application/json';
+        }
+
+        if (!empty($options['decode_content'])
+            && $options['decode_content'] !== true
+        ) {
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\_caseless_remove(['Accept-Encoding'], $options['_conditional']);
+            $modify['set_headers']['Accept-Encoding'] = $options['decode_content'];
+        }
+
+        if (isset($options['body'])) {
+            if (is_array($options['body'])) {
+                $this->invalidBody();
+            }
+            $modify['body'] = Psr7\stream_for($options['body']);
+            unset($options['body']);
+        }
+
+        if (!empty($options['auth']) && is_array($options['auth'])) {
+            $value = $options['auth'];
+            $type = isset($value[2]) ? strtolower($value[2]) : 'basic';
+            switch ($type) {
+                case 'basic':
+                    // Ensure that we don't have the header in different case and set the new value.
+                    $modify['set_headers'] = Psr7\_caseless_remove(['Authorization'], $modify['set_headers']);
+                    $modify['set_headers']['Authorization'] = 'Basic '
+                        . base64_encode("$value[0]:$value[1]");
+                    break;
+                case 'digest':
+                    // @todo: Do not rely on curl
+                    $options['curl'][CURLOPT_HTTPAUTH] = CURLAUTH_DIGEST;
+                    $options['curl'][CURLOPT_USERPWD] = "$value[0]:$value[1]";
+                    break;
+                case 'ntlm':
+                    $options['curl'][CURLOPT_HTTPAUTH] = CURLAUTH_NTLM;
+                    $options['curl'][CURLOPT_USERPWD] = "$value[0]:$value[1]";
+                    break;
+            }
+        }
+
+        if (isset($options['query'])) {
+            $value = $options['query'];
+            if (is_array($value)) {
+                $value = http_build_query($value, null, '&', PHP_QUERY_RFC3986);
+            }
+            if (!is_string($value)) {
+                throw new \InvalidArgumentException('query must be a string or array');
+            }
+            $modify['query'] = $value;
+            unset($options['query']);
+        }
+
+        // Ensure that sink is not an invalid value.
+        if (isset($options['sink'])) {
+            // TODO: Add more sink validation?
+            if (is_bool($options['sink'])) {
+                throw new \InvalidArgumentException('sink must not be a boolean');
+            }
+        }
+
+        $request = Psr7\modify_request($request, $modify);
+        if ($request->getBody() instanceof Psr7\MultipartStream) {
+            // Use a multipart/form-data POST if a Content-Type is not set.
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\_caseless_remove(['Content-Type'], $options['_conditional']);
+            $options['_conditional']['Content-Type'] = 'multipart/form-data; boundary='
+                . $request->getBody()->getBoundary();
+        }
+
+        // Merge in conditional headers if they are not present.
+        if (isset($options['_conditional'])) {
+            // Build up the changes so it's in a single clone of the message.
+            $modify = [];
+            foreach ($options['_conditional'] as $k => $v) {
+                if (!$request->hasHeader($k)) {
+                    $modify['set_headers'][$k] = $v;
+                }
+            }
+            $request = Psr7\modify_request($request, $modify);
+            // Don't pass this internal value along to middleware/handlers.
+            unset($options['_conditional']);
+        }
+
+        return $request;
+    }
+
+    private function invalidBody()
+    {
+        throw new \InvalidArgumentException('Passing in the "body" request '
+            . 'option as an array to send a POST request has been deprecated. '
+            . 'Please use the "form_params" request option to send a '
+            . 'application/x-www-form-urlencoded request, or the "multipart" '
+            . 'request option to send a multipart/form-data request.');
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/ClientInterface.php

@@ -0,0 +1,84 @@
+<?php
+namespace GuzzleHttp;
+
+use GuzzleHttp\Promise\PromiseInterface;
+use GuzzleHttp\Exception\GuzzleException;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Client interface for sending HTTP requests.
+ */
+interface ClientInterface
+{
+    const VERSION = '6.4.1';
+
+    /**
+     * Send an HTTP request.
+     *
+     * @param RequestInterface $request Request to send
+     * @param array            $options Request options to apply to the given
+     *                                  request and to the transfer.
+     *
+     * @return ResponseInterface
+     * @throws GuzzleException
+     */
+    public function send(RequestInterface $request, array $options = []);
+
+    /**
+     * Asynchronously send an HTTP request.
+     *
+     * @param RequestInterface $request Request to send
+     * @param array            $options Request options to apply to the given
+     *                                  request and to the transfer.
+     *
+     * @return PromiseInterface
+     */
+    public function sendAsync(RequestInterface $request, array $options = []);
+
+    /**
+     * Create and send an HTTP request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string              $method  HTTP method.
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @return ResponseInterface
+     * @throws GuzzleException
+     */
+    public function request($method, $uri, array $options = []);
+
+    /**
+     * Create and send an asynchronous HTTP request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string              $method  HTTP method
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @return PromiseInterface
+     */
+    public function requestAsync($method, $uri, array $options = []);
+
+    /**
+     * Get a client configuration option.
+     *
+     * These options include default request options of the client, a "handler"
+     * (if utilized by the concrete client), and a "base_uri" if utilized by
+     * the concrete client.
+     *
+     * @param string|null $option The config option to retrieve.
+     *
+     * @return mixed
+     */
+    public function getConfig($option = null);
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Cookie/CookieJar.php

@@ -0,0 +1,314 @@
+<?php
+namespace GuzzleHttp\Cookie;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Cookie jar that stores cookies as an array
+ */
+class CookieJar implements CookieJarInterface
+{
+    /** @var SetCookie[] Loaded cookie data */
+    private $cookies = [];
+
+    /** @var bool */
+    private $strictMode;
+
+    /**
+     * @param bool $strictMode   Set to true to throw exceptions when invalid
+     *                           cookies are added to the cookie jar.
+     * @param array $cookieArray Array of SetCookie objects or a hash of
+     *                           arrays that can be used with the SetCookie
+     *                           constructor
+     */
+    public function __construct($strictMode = false, $cookieArray = [])
+    {
+        $this->strictMode = $strictMode;
+
+        foreach ($cookieArray as $cookie) {
+            if (!($cookie instanceof SetCookie)) {
+                $cookie = new SetCookie($cookie);
+            }
+            $this->setCookie($cookie);
+        }
+    }
+
+    /**
+     * Create a new Cookie jar from an associative array and domain.
+     *
+     * @param array  $cookies Cookies to create the jar from
+     * @param string $domain  Domain to set the cookies to
+     *
+     * @return self
+     */
+    public static function fromArray(array $cookies, $domain)
+    {
+        $cookieJar = new self();
+        foreach ($cookies as $name => $value) {
+            $cookieJar->setCookie(new SetCookie([
+                'Domain'  => $domain,
+                'Name'    => $name,
+                'Value'   => $value,
+                'Discard' => true
+            ]));
+        }
+
+        return $cookieJar;
+    }
+
+    /**
+     * @deprecated
+     */
+    public static function getCookieValue($value)
+    {
+        return $value;
+    }
+
+    /**
+     * Evaluate if this cookie should be persisted to storage
+     * that survives between requests.
+     *
+     * @param SetCookie $cookie Being evaluated.
+     * @param bool $allowSessionCookies If we should persist session cookies
+     * @return bool
+     */
+    public static function shouldPersist(
+        SetCookie $cookie,
+        $allowSessionCookies = false
+    ) {
+        if ($cookie->getExpires() || $allowSessionCookies) {
+            if (!$cookie->getDiscard()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Finds and returns the cookie based on the name
+     *
+     * @param string $name cookie name to search for
+     * @return SetCookie|null cookie that was found or null if not found
+     */
+    public function getCookieByName($name)
+    {
+        // don't allow a null name
+        if ($name === null) {
+            return null;
+        }
+        foreach ($this->cookies as $cookie) {
+            if ($cookie->getName() !== null && strcasecmp($cookie->getName(), $name) === 0) {
+                return $cookie;
+            }
+        }
+    }
+
+    public function toArray()
+    {
+        return array_map(function (SetCookie $cookie) {
+            return $cookie->toArray();
+        }, $this->getIterator()->getArrayCopy());
+    }
+
+    public function clear($domain = null, $path = null, $name = null)
+    {
+        if (!$domain) {
+            $this->cookies = [];
+            return;
+        } elseif (!$path) {
+            $this->cookies = array_filter(
+                $this->cookies,
+                function (SetCookie $cookie) use ($domain) {
+                    return !$cookie->matchesDomain($domain);
+                }
+            );
+        } elseif (!$name) {
+            $this->cookies = array_filter(
+                $this->cookies,
+                function (SetCookie $cookie) use ($path, $domain) {
+                    return !($cookie->matchesPath($path) &&
+                        $cookie->matchesDomain($domain));
+                }
+            );
+        } else {
+            $this->cookies = array_filter(
+                $this->cookies,
+                function (SetCookie $cookie) use ($path, $domain, $name) {
+                    return !($cookie->getName() == $name &&
+                        $cookie->matchesPath($path) &&
+                        $cookie->matchesDomain($domain));
+                }
+            );
+        }
+    }
+
+    public function clearSessionCookies()
+    {
+        $this->cookies = array_filter(
+            $this->cookies,
+            function (SetCookie $cookie) {
+                return !$cookie->getDiscard() && $cookie->getExpires();
+            }
+        );
+    }
+
+    public function setCookie(SetCookie $cookie)
+    {
+        // If the name string is empty (but not 0), ignore the set-cookie
+        // string entirely.
+        $name = $cookie->getName();
+        if (!$name && $name !== '0') {
+            return false;
+        }
+
+        // Only allow cookies with set and valid domain, name, value
+        $result = $cookie->validate();
+        if ($result !== true) {
+            if ($this->strictMode) {
+                throw new \RuntimeException('Invalid cookie: ' . $result);
+            } else {
+                $this->removeCookieIfEmpty($cookie);
+                return false;
+            }
+        }
+
+        // Resolve conflicts with previously set cookies
+        foreach ($this->cookies as $i => $c) {
+
+            // Two cookies are identical, when their path, and domain are
+            // identical.
+            if ($c->getPath() != $cookie->getPath() ||
+                $c->getDomain() != $cookie->getDomain() ||
+                $c->getName() != $cookie->getName()
+            ) {
+                continue;
+            }
+
+            // The previously set cookie is a discard cookie and this one is
+            // not so allow the new cookie to be set
+            if (!$cookie->getDiscard() && $c->getDiscard()) {
+                unset($this->cookies[$i]);
+                continue;
+            }
+
+            // If the new cookie's expiration is further into the future, then
+            // replace the old cookie
+            if ($cookie->getExpires() > $c->getExpires()) {
+                unset($this->cookies[$i]);
+                continue;
+            }
+
+            // If the value has changed, we better change it
+            if ($cookie->getValue() !== $c->getValue()) {
+                unset($this->cookies[$i]);
+                continue;
+            }
+
+            // The cookie exists, so no need to continue
+            return false;
+        }
+
+        $this->cookies[] = $cookie;
+
+        return true;
+    }
+
+    public function count()
+    {
+        return count($this->cookies);
+    }
+
+    public function getIterator()
+    {
+        return new \ArrayIterator(array_values($this->cookies));
+    }
+
+    public function extractCookies(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        if ($cookieHeader = $response->getHeader('Set-Cookie')) {
+            foreach ($cookieHeader as $cookie) {
+                $sc = SetCookie::fromString($cookie);
+                if (!$sc->getDomain()) {
+                    $sc->setDomain($request->getUri()->getHost());
+                }
+                if (0 !== strpos($sc->getPath(), '/')) {
+                    $sc->setPath($this->getCookiePathFromRequest($request));
+                }
+                $this->setCookie($sc);
+            }
+        }
+    }
+
+    /**
+     * Computes cookie path following RFC 6265 section 5.1.4
+     *
+     * @link https://tools.ietf.org/html/rfc6265#section-5.1.4
+     *
+     * @param RequestInterface $request
+     * @return string
+     */
+    private function getCookiePathFromRequest(RequestInterface $request)
+    {
+        $uriPath = $request->getUri()->getPath();
+        if (''  === $uriPath) {
+            return '/';
+        }
+        if (0 !== strpos($uriPath, '/')) {
+            return '/';
+        }
+        if ('/' === $uriPath) {
+            return '/';
+        }
+        if (0 === $lastSlashPos = strrpos($uriPath, '/')) {
+            return '/';
+        }
+
+        return substr($uriPath, 0, $lastSlashPos);
+    }
+
+    public function withCookieHeader(RequestInterface $request)
+    {
+        $values = [];
+        $uri = $request->getUri();
+        $scheme = $uri->getScheme();
+        $host = $uri->getHost();
+        $path = $uri->getPath() ?: '/';
+
+        foreach ($this->cookies as $cookie) {
+            if ($cookie->matchesPath($path) &&
+                $cookie->matchesDomain($host) &&
+                !$cookie->isExpired() &&
+                (!$cookie->getSecure() || $scheme === 'https')
+            ) {
+                $values[] = $cookie->getName() . '='
+                    . $cookie->getValue();
+            }
+        }
+
+        return $values
+            ? $request->withHeader('Cookie', implode('; ', $values))
+            : $request;
+    }
+
+    /**
+     * If a cookie already exists and the server asks to set it again with a
+     * null value, the cookie must be deleted.
+     *
+     * @param SetCookie $cookie
+     */
+    private function removeCookieIfEmpty(SetCookie $cookie)
+    {
+        $cookieValue = $cookie->getValue();
+        if ($cookieValue === null || $cookieValue === '') {
+            $this->clear(
+                $cookie->getDomain(),
+                $cookie->getPath(),
+                $cookie->getName()
+            );
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Cookie/CookieJarInterface.php

@@ -0,0 +1,84 @@
+<?php
+namespace GuzzleHttp\Cookie;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Stores HTTP cookies.
+ *
+ * It extracts cookies from HTTP requests, and returns them in HTTP responses.
+ * CookieJarInterface instances automatically expire contained cookies when
+ * necessary. Subclasses are also responsible for storing and retrieving
+ * cookies from a file, database, etc.
+ *
+ * @link http://docs.python.org/2/library/cookielib.html Inspiration
+ */
+interface CookieJarInterface extends \Countable, \IteratorAggregate
+{
+    /**
+     * Create a request with added cookie headers.
+     *
+     * If no matching cookies are found in the cookie jar, then no Cookie
+     * header is added to the request and the same request is returned.
+     *
+     * @param RequestInterface $request Request object to modify.
+     *
+     * @return RequestInterface returns the modified request.
+     */
+    public function withCookieHeader(RequestInterface $request);
+
+    /**
+     * Extract cookies from an HTTP response and store them in the CookieJar.
+     *
+     * @param RequestInterface  $request  Request that was sent
+     * @param ResponseInterface $response Response that was received
+     */
+    public function extractCookies(
+        RequestInterface $request,
+        ResponseInterface $response
+    );
+
+    /**
+     * Sets a cookie in the cookie jar.
+     *
+     * @param SetCookie $cookie Cookie to set.
+     *
+     * @return bool Returns true on success or false on failure
+     */
+    public function setCookie(SetCookie $cookie);
+
+    /**
+     * Remove cookies currently held in the cookie jar.
+     *
+     * Invoking this method without arguments will empty the whole cookie jar.
+     * If given a $domain argument only cookies belonging to that domain will
+     * be removed. If given a $domain and $path argument, cookies belonging to
+     * the specified path within that domain are removed. If given all three
+     * arguments, then the cookie with the specified name, path and domain is
+     * removed.
+     *
+     * @param string $domain Clears cookies matching a domain
+     * @param string $path   Clears cookies matching a domain and path
+     * @param string $name   Clears cookies matching a domain, path, and name
+     *
+     * @return CookieJarInterface
+     */
+    public function clear($domain = null, $path = null, $name = null);
+
+    /**
+     * Discard all sessions cookies.
+     *
+     * Removes cookies that don't have an expire field or a have a discard
+     * field set to true. To be called when the user agent shuts down according
+     * to RFC 2965.
+     */
+    public function clearSessionCookies();
+
+    /**
+     * Converts the cookie jar to an array.
+     *
+     * @return array
+     */
+    public function toArray();
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Cookie/FileCookieJar.php

@@ -0,0 +1,91 @@
+<?php
+namespace GuzzleHttp\Cookie;
+
+/**
+ * Persists non-session cookies using a JSON formatted file
+ */
+class FileCookieJar extends CookieJar
+{
+    /** @var string filename */
+    private $filename;
+
+    /** @var bool Control whether to persist session cookies or not. */
+    private $storeSessionCookies;
+
+    /**
+     * Create a new FileCookieJar object
+     *
+     * @param string $cookieFile        File to store the cookie data
+     * @param bool $storeSessionCookies Set to true to store session cookies
+     *                                  in the cookie jar.
+     *
+     * @throws \RuntimeException if the file cannot be found or created
+     */
+    public function __construct($cookieFile, $storeSessionCookies = false)
+    {
+        parent::__construct();
+        $this->filename = $cookieFile;
+        $this->storeSessionCookies = $storeSessionCookies;
+
+        if (file_exists($cookieFile)) {
+            $this->load($cookieFile);
+        }
+    }
+
+    /**
+     * Saves the file when shutting down
+     */
+    public function __destruct()
+    {
+        $this->save($this->filename);
+    }
+
+    /**
+     * Saves the cookies to a file.
+     *
+     * @param string $filename File to save
+     * @throws \RuntimeException if the file cannot be found or created
+     */
+    public function save($filename)
+    {
+        $json = [];
+        foreach ($this as $cookie) {
+            /** @var SetCookie $cookie */
+            if (CookieJar::shouldPersist($cookie, $this->storeSessionCookies)) {
+                $json[] = $cookie->toArray();
+            }
+        }
+
+        $jsonStr = \GuzzleHttp\json_encode($json);
+        if (false === file_put_contents($filename, $jsonStr, LOCK_EX)) {
+            throw new \RuntimeException("Unable to save file {$filename}");
+        }
+    }
+
+    /**
+     * Load cookies from a JSON formatted file.
+     *
+     * Old cookies are kept unless overwritten by newly loaded ones.
+     *
+     * @param string $filename Cookie file to load.
+     * @throws \RuntimeException if the file cannot be loaded.
+     */
+    public function load($filename)
+    {
+        $json = file_get_contents($filename);
+        if (false === $json) {
+            throw new \RuntimeException("Unable to load file {$filename}");
+        } elseif ($json === '') {
+            return;
+        }
+
+        $data = \GuzzleHttp\json_decode($json, true);
+        if (is_array($data)) {
+            foreach (json_decode($json, true) as $cookie) {
+                $this->setCookie(new SetCookie($cookie));
+            }
+        } elseif (strlen($data)) {
+            throw new \RuntimeException("Invalid cookie file: {$filename}");
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Cookie/SessionCookieJar.php

@@ -0,0 +1,72 @@
+<?php
+namespace GuzzleHttp\Cookie;
+
+/**
+ * Persists cookies in the client session
+ */
+class SessionCookieJar extends CookieJar
+{
+    /** @var string session key */
+    private $sessionKey;
+    
+    /** @var bool Control whether to persist session cookies or not. */
+    private $storeSessionCookies;
+
+    /**
+     * Create a new SessionCookieJar object
+     *
+     * @param string $sessionKey        Session key name to store the cookie
+     *                                  data in session
+     * @param bool $storeSessionCookies Set to true to store session cookies
+     *                                  in the cookie jar.
+     */
+    public function __construct($sessionKey, $storeSessionCookies = false)
+    {
+        parent::__construct();
+        $this->sessionKey = $sessionKey;
+        $this->storeSessionCookies = $storeSessionCookies;
+        $this->load();
+    }
+
+    /**
+     * Saves cookies to session when shutting down
+     */
+    public function __destruct()
+    {
+        $this->save();
+    }
+
+    /**
+     * Save cookies to the client session
+     */
+    public function save()
+    {
+        $json = [];
+        foreach ($this as $cookie) {
+            /** @var SetCookie $cookie */
+            if (CookieJar::shouldPersist($cookie, $this->storeSessionCookies)) {
+                $json[] = $cookie->toArray();
+            }
+        }
+
+        $_SESSION[$this->sessionKey] = json_encode($json);
+    }
+
+    /**
+     * Load the contents of the client session into the data array
+     */
+    protected function load()
+    {
+        if (!isset($_SESSION[$this->sessionKey])) {
+            return;
+        }
+        $data = json_decode($_SESSION[$this->sessionKey], true);
+        if (is_array($data)) {
+            foreach ($data as $cookie) {
+                $this->setCookie(new SetCookie($cookie));
+            }
+        } elseif (strlen($data)) {
+            throw new \RuntimeException("Invalid cookie data");
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Cookie/SetCookie.php

@@ -0,0 +1,403 @@
+<?php
+namespace GuzzleHttp\Cookie;
+
+/**
+ * Set-Cookie object
+ */
+class SetCookie
+{
+    /** @var array */
+    private static $defaults = [
+        'Name'     => null,
+        'Value'    => null,
+        'Domain'   => null,
+        'Path'     => '/',
+        'Max-Age'  => null,
+        'Expires'  => null,
+        'Secure'   => false,
+        'Discard'  => false,
+        'HttpOnly' => false
+    ];
+
+    /** @var array Cookie data */
+    private $data;
+
+    /**
+     * Create a new SetCookie object from a string
+     *
+     * @param string $cookie Set-Cookie header string
+     *
+     * @return self
+     */
+    public static function fromString($cookie)
+    {
+        // Create the default return array
+        $data = self::$defaults;
+        // Explode the cookie string using a series of semicolons
+        $pieces = array_filter(array_map('trim', explode(';', $cookie)));
+        // The name of the cookie (first kvp) must exist and include an equal sign.
+        if (empty($pieces[0]) || !strpos($pieces[0], '=')) {
+            return new self($data);
+        }
+
+        // Add the cookie pieces into the parsed data array
+        foreach ($pieces as $part) {
+            $cookieParts = explode('=', $part, 2);
+            $key = trim($cookieParts[0]);
+            $value = isset($cookieParts[1])
+                ? trim($cookieParts[1], " \n\r\t\0\x0B")
+                : true;
+
+            // Only check for non-cookies when cookies have been found
+            if (empty($data['Name'])) {
+                $data['Name'] = $key;
+                $data['Value'] = $value;
+            } else {
+                foreach (array_keys(self::$defaults) as $search) {
+                    if (!strcasecmp($search, $key)) {
+                        $data[$search] = $value;
+                        continue 2;
+                    }
+                }
+                $data[$key] = $value;
+            }
+        }
+
+        return new self($data);
+    }
+
+    /**
+     * @param array $data Array of cookie data provided by a Cookie parser
+     */
+    public function __construct(array $data = [])
+    {
+        $this->data = array_replace(self::$defaults, $data);
+        // Extract the Expires value and turn it into a UNIX timestamp if needed
+        if (!$this->getExpires() && $this->getMaxAge()) {
+            // Calculate the Expires date
+            $this->setExpires(time() + $this->getMaxAge());
+        } elseif ($this->getExpires() && !is_numeric($this->getExpires())) {
+            $this->setExpires($this->getExpires());
+        }
+    }
+
+    public function __toString()
+    {
+        $str = $this->data['Name'] . '=' . $this->data['Value'] . '; ';
+        foreach ($this->data as $k => $v) {
+            if ($k !== 'Name' && $k !== 'Value' && $v !== null && $v !== false) {
+                if ($k === 'Expires') {
+                    $str .= 'Expires=' . gmdate('D, d M Y H:i:s \G\M\T', $v) . '; ';
+                } else {
+                    $str .= ($v === true ? $k : "{$k}={$v}") . '; ';
+                }
+            }
+        }
+
+        return rtrim($str, '; ');
+    }
+
+    public function toArray()
+    {
+        return $this->data;
+    }
+
+    /**
+     * Get the cookie name
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->data['Name'];
+    }
+
+    /**
+     * Set the cookie name
+     *
+     * @param string $name Cookie name
+     */
+    public function setName($name)
+    {
+        $this->data['Name'] = $name;
+    }
+
+    /**
+     * Get the cookie value
+     *
+     * @return string
+     */
+    public function getValue()
+    {
+        return $this->data['Value'];
+    }
+
+    /**
+     * Set the cookie value
+     *
+     * @param string $value Cookie value
+     */
+    public function setValue($value)
+    {
+        $this->data['Value'] = $value;
+    }
+
+    /**
+     * Get the domain
+     *
+     * @return string|null
+     */
+    public function getDomain()
+    {
+        return $this->data['Domain'];
+    }
+
+    /**
+     * Set the domain of the cookie
+     *
+     * @param string $domain
+     */
+    public function setDomain($domain)
+    {
+        $this->data['Domain'] = $domain;
+    }
+
+    /**
+     * Get the path
+     *
+     * @return string
+     */
+    public function getPath()
+    {
+        return $this->data['Path'];
+    }
+
+    /**
+     * Set the path of the cookie
+     *
+     * @param string $path Path of the cookie
+     */
+    public function setPath($path)
+    {
+        $this->data['Path'] = $path;
+    }
+
+    /**
+     * Maximum lifetime of the cookie in seconds
+     *
+     * @return int|null
+     */
+    public function getMaxAge()
+    {
+        return $this->data['Max-Age'];
+    }
+
+    /**
+     * Set the max-age of the cookie
+     *
+     * @param int $maxAge Max age of the cookie in seconds
+     */
+    public function setMaxAge($maxAge)
+    {
+        $this->data['Max-Age'] = $maxAge;
+    }
+
+    /**
+     * The UNIX timestamp when the cookie Expires
+     *
+     * @return mixed
+     */
+    public function getExpires()
+    {
+        return $this->data['Expires'];
+    }
+
+    /**
+     * Set the unix timestamp for which the cookie will expire
+     *
+     * @param int $timestamp Unix timestamp
+     */
+    public function setExpires($timestamp)
+    {
+        $this->data['Expires'] = is_numeric($timestamp)
+            ? (int) $timestamp
+            : strtotime($timestamp);
+    }
+
+    /**
+     * Get whether or not this is a secure cookie
+     *
+     * @return bool|null
+     */
+    public function getSecure()
+    {
+        return $this->data['Secure'];
+    }
+
+    /**
+     * Set whether or not the cookie is secure
+     *
+     * @param bool $secure Set to true or false if secure
+     */
+    public function setSecure($secure)
+    {
+        $this->data['Secure'] = $secure;
+    }
+
+    /**
+     * Get whether or not this is a session cookie
+     *
+     * @return bool|null
+     */
+    public function getDiscard()
+    {
+        return $this->data['Discard'];
+    }
+
+    /**
+     * Set whether or not this is a session cookie
+     *
+     * @param bool $discard Set to true or false if this is a session cookie
+     */
+    public function setDiscard($discard)
+    {
+        $this->data['Discard'] = $discard;
+    }
+
+    /**
+     * Get whether or not this is an HTTP only cookie
+     *
+     * @return bool
+     */
+    public function getHttpOnly()
+    {
+        return $this->data['HttpOnly'];
+    }
+
+    /**
+     * Set whether or not this is an HTTP only cookie
+     *
+     * @param bool $httpOnly Set to true or false if this is HTTP only
+     */
+    public function setHttpOnly($httpOnly)
+    {
+        $this->data['HttpOnly'] = $httpOnly;
+    }
+
+    /**
+     * Check if the cookie matches a path value.
+     *
+     * A request-path path-matches a given cookie-path if at least one of
+     * the following conditions holds:
+     *
+     * - The cookie-path and the request-path are identical.
+     * - The cookie-path is a prefix of the request-path, and the last
+     *   character of the cookie-path is %x2F ("/").
+     * - The cookie-path is a prefix of the request-path, and the first
+     *   character of the request-path that is not included in the cookie-
+     *   path is a %x2F ("/") character.
+     *
+     * @param string $requestPath Path to check against
+     *
+     * @return bool
+     */
+    public function matchesPath($requestPath)
+    {
+        $cookiePath = $this->getPath();
+
+        // Match on exact matches or when path is the default empty "/"
+        if ($cookiePath === '/' || $cookiePath == $requestPath) {
+            return true;
+        }
+
+        // Ensure that the cookie-path is a prefix of the request path.
+        if (0 !== strpos($requestPath, $cookiePath)) {
+            return false;
+        }
+
+        // Match if the last character of the cookie-path is "/"
+        if (substr($cookiePath, -1, 1) === '/') {
+            return true;
+        }
+
+        // Match if the first character not included in cookie path is "/"
+        return substr($requestPath, strlen($cookiePath), 1) === '/';
+    }
+
+    /**
+     * Check if the cookie matches a domain value
+     *
+     * @param string $domain Domain to check against
+     *
+     * @return bool
+     */
+    public function matchesDomain($domain)
+    {
+        // Remove the leading '.' as per spec in RFC 6265.
+        // http://tools.ietf.org/html/rfc6265#section-5.2.3
+        $cookieDomain = ltrim($this->getDomain(), '.');
+
+        // Domain not set or exact match.
+        if (!$cookieDomain || !strcasecmp($domain, $cookieDomain)) {
+            return true;
+        }
+
+        // Matching the subdomain according to RFC 6265.
+        // http://tools.ietf.org/html/rfc6265#section-5.1.3
+        if (filter_var($domain, FILTER_VALIDATE_IP)) {
+            return false;
+        }
+
+        return (bool) preg_match('/\.' . preg_quote($cookieDomain, '/') . '$/', $domain);
+    }
+
+    /**
+     * Check if the cookie is expired
+     *
+     * @return bool
+     */
+    public function isExpired()
+    {
+        return $this->getExpires() !== null && time() > $this->getExpires();
+    }
+
+    /**
+     * Check if the cookie is valid according to RFC 6265
+     *
+     * @return bool|string Returns true if valid or an error message if invalid
+     */
+    public function validate()
+    {
+        // Names must not be empty, but can be 0
+        $name = $this->getName();
+        if (empty($name) && !is_numeric($name)) {
+            return 'The cookie name must not be empty';
+        }
+
+        // Check if any of the invalid characters are present in the cookie name
+        if (preg_match(
+            '/[\x00-\x20\x22\x28-\x29\x2c\x2f\x3a-\x40\x5c\x7b\x7d\x7f]/',
+            $name
+        )) {
+            return 'Cookie name must not contain invalid characters: ASCII '
+                . 'Control characters (0-31;127), space, tab and the '
+                . 'following characters: ()<>@,;:\"/?={}';
+        }
+
+        // Value must not be empty, but can be 0
+        $value = $this->getValue();
+        if (empty($value) && !is_numeric($value)) {
+            return 'The cookie value must not be empty';
+        }
+
+        // Domains must not be empty, but can be 0
+        // A "0" is not a valid internet domain, but may be used as server name
+        // in a private network.
+        $domain = $this->getDomain();
+        if (empty($domain) && !is_numeric($domain)) {
+            return 'The cookie domain must not be empty';
+        }
+
+        return true;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/BadResponseException.php

@@ -0,0 +1,27 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Exception when an HTTP error occurs (4xx or 5xx error)
+ */
+class BadResponseException extends RequestException
+{
+    public function __construct(
+        $message,
+        RequestInterface $request,
+        ResponseInterface $response = null,
+        \Exception $previous = null,
+        array $handlerContext = []
+    ) {
+        if (null === $response) {
+            @trigger_error(
+                'Instantiating the ' . __CLASS__ . ' class without a Response is deprecated since version 6.3 and will be removed in 7.0.',
+                E_USER_DEPRECATED
+            );
+        }
+        parent::__construct($message, $request, $response, $previous, $handlerContext);
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/ClientException.php

@@ -0,0 +1,9 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+/**
+ * Exception when a client error is encountered (4xx codes)
+ */
+class ClientException extends BadResponseException
+{
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/ConnectException.php

@@ -0,0 +1,37 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * Exception thrown when a connection cannot be established.
+ *
+ * Note that no response is present for a ConnectException
+ */
+class ConnectException extends RequestException
+{
+    public function __construct(
+        $message,
+        RequestInterface $request,
+        \Exception $previous = null,
+        array $handlerContext = []
+    ) {
+        parent::__construct($message, $request, null, $previous, $handlerContext);
+    }
+
+    /**
+     * @return null
+     */
+    public function getResponse()
+    {
+        return null;
+    }
+
+    /**
+     * @return bool
+     */
+    public function hasResponse()
+    {
+        return false;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/GuzzleException.php

@@ -0,0 +1,23 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+use Throwable;
+
+if (interface_exists(Throwable::class)) {
+    interface GuzzleException extends Throwable
+    {
+    }
+} else {
+    /**
+     * @method string getMessage()
+     * @method \Throwable|null getPrevious()
+     * @method mixed getCode()
+     * @method string getFile()
+     * @method int getLine()
+     * @method array getTrace()
+     * @method string getTraceAsString()
+     */
+    interface GuzzleException
+    {
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/InvalidArgumentException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace GuzzleHttp\Exception;
+
+final class InvalidArgumentException extends \InvalidArgumentException implements GuzzleException
+{
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php

@@ -0,0 +1,217 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use GuzzleHttp\Promise\PromiseInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * HTTP Request exception
+ */
+class RequestException extends TransferException
+{
+    /** @var RequestInterface */
+    private $request;
+
+    /** @var ResponseInterface */
+    private $response;
+
+    /** @var array */
+    private $handlerContext;
+
+    public function __construct(
+        $message,
+        RequestInterface $request,
+        ResponseInterface $response = null,
+        \Exception $previous = null,
+        array $handlerContext = []
+    ) {
+        // Set the code of the exception if the response is set and not future.
+        $code = $response && !($response instanceof PromiseInterface)
+            ? $response->getStatusCode()
+            : 0;
+        parent::__construct($message, $code, $previous);
+        $this->request = $request;
+        $this->response = $response;
+        $this->handlerContext = $handlerContext;
+    }
+
+    /**
+     * Wrap non-RequestExceptions with a RequestException
+     *
+     * @param RequestInterface $request
+     * @param \Exception       $e
+     *
+     * @return RequestException
+     */
+    public static function wrapException(RequestInterface $request, \Exception $e)
+    {
+        return $e instanceof RequestException
+            ? $e
+            : new RequestException($e->getMessage(), $request, null, $e);
+    }
+
+    /**
+     * Factory method to create a new exception with a normalized error message
+     *
+     * @param RequestInterface  $request  Request
+     * @param ResponseInterface $response Response received
+     * @param \Exception        $previous Previous exception
+     * @param array             $ctx      Optional handler context.
+     *
+     * @return self
+     */
+    public static function create(
+        RequestInterface $request,
+        ResponseInterface $response = null,
+        \Exception $previous = null,
+        array $ctx = []
+    ) {
+        if (!$response) {
+            return new self(
+                'Error completing request',
+                $request,
+                null,
+                $previous,
+                $ctx
+            );
+        }
+
+        $level = (int) floor($response->getStatusCode() / 100);
+        if ($level === 4) {
+            $label = 'Client error';
+            $className = ClientException::class;
+        } elseif ($level === 5) {
+            $label = 'Server error';
+            $className = ServerException::class;
+        } else {
+            $label = 'Unsuccessful request';
+            $className = __CLASS__;
+        }
+
+        $uri = $request->getUri();
+        $uri = static::obfuscateUri($uri);
+
+        // Client Error: `GET /` resulted in a `404 Not Found` response:
+        // <html> ... (truncated)
+        $message = sprintf(
+            '%s: `%s %s` resulted in a `%s %s` response',
+            $label,
+            $request->getMethod(),
+            $uri,
+            $response->getStatusCode(),
+            $response->getReasonPhrase()
+        );
+
+        $summary = static::getResponseBodySummary($response);
+
+        if ($summary !== null) {
+            $message .= ":\n{$summary}\n";
+        }
+
+        return new $className($message, $request, $response, $previous, $ctx);
+    }
+
+    /**
+     * Get a short summary of the response
+     *
+     * Will return `null` if the response is not printable.
+     *
+     * @param ResponseInterface $response
+     *
+     * @return string|null
+     */
+    public static function getResponseBodySummary(ResponseInterface $response)
+    {
+        $body = $response->getBody();
+
+        if (!$body->isSeekable() || !$body->isReadable()) {
+            return null;
+        }
+
+        $size = $body->getSize();
+
+        if ($size === 0) {
+            return null;
+        }
+
+        $summary = $body->read(120);
+        $body->rewind();
+
+        if ($size > 120) {
+            $summary .= ' (truncated...)';
+        }
+
+        // Matches any printable character, including unicode characters:
+        // letters, marks, numbers, punctuation, spacing, and separators.
+        if (preg_match('/[^\pL\pM\pN\pP\pS\pZ\n\r\t]/', $summary)) {
+            return null;
+        }
+
+        return $summary;
+    }
+
+    /**
+     * Obfuscates URI if there is an username and a password present
+     *
+     * @param UriInterface $uri
+     *
+     * @return UriInterface
+     */
+    private static function obfuscateUri($uri)
+    {
+        $userInfo = $uri->getUserInfo();
+
+        if (false !== ($pos = strpos($userInfo, ':'))) {
+            return $uri->withUserInfo(substr($userInfo, 0, $pos), '***');
+        }
+
+        return $uri;
+    }
+
+    /**
+     * Get the request that caused the exception
+     *
+     * @return RequestInterface
+     */
+    public function getRequest()
+    {
+        return $this->request;
+    }
+
+    /**
+     * Get the associated response
+     *
+     * @return ResponseInterface|null
+     */
+    public function getResponse()
+    {
+        return $this->response;
+    }
+
+    /**
+     * Check if a response was received
+     *
+     * @return bool
+     */
+    public function hasResponse()
+    {
+        return $this->response !== null;
+    }
+
+    /**
+     * Get contextual information about the error from the underlying handler.
+     *
+     * The contents of this array will vary depending on which handler you are
+     * using. It may also be just an empty array. Relying on this data will
+     * couple you to a specific handler, but can give more debug information
+     * when needed.
+     *
+     * @return array
+     */
+    public function getHandlerContext()
+    {
+        return $this->handlerContext;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/SeekException.php

@@ -0,0 +1,27 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Exception thrown when a seek fails on a stream.
+ */
+class SeekException extends \RuntimeException implements GuzzleException
+{
+    private $stream;
+
+    public function __construct(StreamInterface $stream, $pos = 0, $msg = '')
+    {
+        $this->stream = $stream;
+        $msg = $msg ?: 'Could not seek the stream to position ' . $pos;
+        parent::__construct($msg);
+    }
+
+    /**
+     * @return StreamInterface
+     */
+    public function getStream()
+    {
+        return $this->stream;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/ServerException.php

@@ -0,0 +1,9 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+/**
+ * Exception when a server error is encountered (5xx codes)
+ */
+class ServerException extends BadResponseException
+{
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/TooManyRedirectsException.php

@@ -0,0 +1,6 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+class TooManyRedirectsException extends RequestException
+{
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Exception/TransferException.php

@@ -0,0 +1,6 @@
+<?php
+namespace GuzzleHttp\Exception;
+
+class TransferException extends \RuntimeException implements GuzzleException
+{
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php

@@ -0,0 +1,580 @@
+<?php
+namespace GuzzleHttp\Handler;
+
+use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\ConnectException;
+use GuzzleHttp\Promise\FulfilledPromise;
+use GuzzleHttp\Psr7;
+use GuzzleHttp\Psr7\LazyOpenStream;
+use GuzzleHttp\TransferStats;
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * Creates curl resources from a request
+ */
+class CurlFactory implements CurlFactoryInterface
+{
+    const CURL_VERSION_STR = 'curl_version';
+    const LOW_CURL_VERSION_NUMBER = '7.21.2';
+
+    /** @var array */
+    private $handles = [];
+
+    /** @var int Total number of idle handles to keep in cache */
+    private $maxHandles;
+
+    /**
+     * @param int $maxHandles Maximum number of idle handles.
+     */
+    public function __construct($maxHandles)
+    {
+        $this->maxHandles = $maxHandles;
+    }
+
+    public function create(RequestInterface $request, array $options)
+    {
+        if (isset($options['curl']['body_as_string'])) {
+            $options['_body_as_string'] = $options['curl']['body_as_string'];
+            unset($options['curl']['body_as_string']);
+        }
+
+        $easy = new EasyHandle;
+        $easy->request = $request;
+        $easy->options = $options;
+        $conf = $this->getDefaultConf($easy);
+        $this->applyMethod($easy, $conf);
+        $this->applyHandlerOptions($easy, $conf);
+        $this->applyHeaders($easy, $conf);
+        unset($conf['_headers']);
+
+        // Add handler options from the request configuration options
+        if (isset($options['curl'])) {
+            $conf = array_replace($conf, $options['curl']);
+        }
+
+        $conf[CURLOPT_HEADERFUNCTION] = $this->createHeaderFn($easy);
+        $easy->handle = $this->handles
+            ? array_pop($this->handles)
+            : curl_init();
+        curl_setopt_array($easy->handle, $conf);
+
+        return $easy;
+    }
+
+    public function release(EasyHandle $easy)
+    {
+        $resource = $easy->handle;
+        unset($easy->handle);
+
+        if (count($this->handles) >= $this->maxHandles) {
+            curl_close($resource);
+        } else {
+            // Remove all callback functions as they can hold onto references
+            // and are not cleaned up by curl_reset. Using curl_setopt_array
+            // does not work for some reason, so removing each one
+            // individually.
+            curl_setopt($resource, CURLOPT_HEADERFUNCTION, null);
+            curl_setopt($resource, CURLOPT_READFUNCTION, null);
+            curl_setopt($resource, CURLOPT_WRITEFUNCTION, null);
+            curl_setopt($resource, CURLOPT_PROGRESSFUNCTION, null);
+            curl_reset($resource);
+            $this->handles[] = $resource;
+        }
+    }
+
+    /**
+     * Completes a cURL transaction, either returning a response promise or a
+     * rejected promise.
+     *
+     * @param callable             $handler
+     * @param EasyHandle           $easy
+     * @param CurlFactoryInterface $factory Dictates how the handle is released
+     *
+     * @return \GuzzleHttp\Promise\PromiseInterface
+     */
+    public static function finish(
+        callable $handler,
+        EasyHandle $easy,
+        CurlFactoryInterface $factory
+    ) {
+        if (isset($easy->options['on_stats'])) {
+            self::invokeStats($easy);
+        }
+
+        if (!$easy->response || $easy->errno) {
+            return self::finishError($handler, $easy, $factory);
+        }
+
+        // Return the response if it is present and there is no error.
+        $factory->release($easy);
+
+        // Rewind the body of the response if possible.
+        $body = $easy->response->getBody();
+        if ($body->isSeekable()) {
+            $body->rewind();
+        }
+
+        return new FulfilledPromise($easy->response);
+    }
+
+    private static function invokeStats(EasyHandle $easy)
+    {
+        $curlStats = curl_getinfo($easy->handle);
+        $curlStats['appconnect_time'] = curl_getinfo($easy->handle, CURLINFO_APPCONNECT_TIME);
+        $stats = new TransferStats(
+            $easy->request,
+            $easy->response,
+            $curlStats['total_time'],
+            $easy->errno,
+            $curlStats
+        );
+        call_user_func($easy->options['on_stats'], $stats);
+    }
+
+    private static function finishError(
+        callable $handler,
+        EasyHandle $easy,
+        CurlFactoryInterface $factory
+    ) {
+        // Get error information and release the handle to the factory.
+        $ctx = [
+            'errno' => $easy->errno,
+            'error' => curl_error($easy->handle),
+            'appconnect_time' => curl_getinfo($easy->handle, CURLINFO_APPCONNECT_TIME),
+        ] + curl_getinfo($easy->handle);
+        $ctx[self::CURL_VERSION_STR] = curl_version()['version'];
+        $factory->release($easy);
+
+        // Retry when nothing is present or when curl failed to rewind.
+        if (empty($easy->options['_err_message'])
+            && (!$easy->errno || $easy->errno == 65)
+        ) {
+            return self::retryFailedRewind($handler, $easy, $ctx);
+        }
+
+        return self::createRejection($easy, $ctx);
+    }
+
+    private static function createRejection(EasyHandle $easy, array $ctx)
+    {
+        static $connectionErrors = [
+            CURLE_OPERATION_TIMEOUTED  => true,
+            CURLE_COULDNT_RESOLVE_HOST => true,
+            CURLE_COULDNT_CONNECT      => true,
+            CURLE_SSL_CONNECT_ERROR    => true,
+            CURLE_GOT_NOTHING          => true,
+        ];
+
+        // If an exception was encountered during the onHeaders event, then
+        // return a rejected promise that wraps that exception.
+        if ($easy->onHeadersException) {
+            return \GuzzleHttp\Promise\rejection_for(
+                new RequestException(
+                    'An error was encountered during the on_headers event',
+                    $easy->request,
+                    $easy->response,
+                    $easy->onHeadersException,
+                    $ctx
+                )
+            );
+        }
+        if (version_compare($ctx[self::CURL_VERSION_STR], self::LOW_CURL_VERSION_NUMBER)) {
+            $message = sprintf(
+                'cURL error %s: %s (%s)',
+                $ctx['errno'],
+                $ctx['error'],
+                'see https://curl.haxx.se/libcurl/c/libcurl-errors.html'
+            );
+        } else {
+            $message = sprintf(
+                'cURL error %s: %s (%s) for %s',
+                $ctx['errno'],
+                $ctx['error'],
+                'see https://curl.haxx.se/libcurl/c/libcurl-errors.html',
+                $easy->request->getUri()
+            );
+        }
+
+        // Create a connection exception if it was a specific error code.
+        $error = isset($connectionErrors[$easy->errno])
+            ? new ConnectException($message, $easy->request, null, $ctx)
+            : new RequestException($message, $easy->request, $easy->response, null, $ctx);
+
+        return \GuzzleHttp\Promise\rejection_for($error);
+    }
+
+    private function getDefaultConf(EasyHandle $easy)
+    {
+        $conf = [
+            '_headers'             => $easy->request->getHeaders(),
+            CURLOPT_CUSTOMREQUEST  => $easy->request->getMethod(),
+            CURLOPT_URL            => (string) $easy->request->getUri()->withFragment(''),
+            CURLOPT_RETURNTRANSFER => false,
+            CURLOPT_HEADER         => false,
+            CURLOPT_CONNECTTIMEOUT => 150,
+        ];
+
+        if (defined('CURLOPT_PROTOCOLS')) {
+            $conf[CURLOPT_PROTOCOLS] = CURLPROTO_HTTP | CURLPROTO_HTTPS;
+        }
+
+        $version = $easy->request->getProtocolVersion();
+        if ($version == 1.1) {
+            $conf[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_1;
+        } elseif ($version == 2.0) {
+            $conf[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_2_0;
+        } else {
+            $conf[CURLOPT_HTTP_VERSION] = CURL_HTTP_VERSION_1_0;
+        }
+
+        return $conf;
+    }
+
+    private function applyMethod(EasyHandle $easy, array &$conf)
+    {
+        $body = $easy->request->getBody();
+        $size = $body->getSize();
+
+        if ($size === null || $size > 0) {
+            $this->applyBody($easy->request, $easy->options, $conf);
+            return;
+        }
+
+        $method = $easy->request->getMethod();
+        if ($method === 'PUT' || $method === 'POST') {
+            // See http://tools.ietf.org/html/rfc7230#section-3.3.2
+            if (!$easy->request->hasHeader('Content-Length')) {
+                $conf[CURLOPT_HTTPHEADER][] = 'Content-Length: 0';
+            }
+        } elseif ($method === 'HEAD') {
+            $conf[CURLOPT_NOBODY] = true;
+            unset(
+                $conf[CURLOPT_WRITEFUNCTION],
+                $conf[CURLOPT_READFUNCTION],
+                $conf[CURLOPT_FILE],
+                $conf[CURLOPT_INFILE]
+            );
+        }
+    }
+
+    private function applyBody(RequestInterface $request, array $options, array &$conf)
+    {
+        $size = $request->hasHeader('Content-Length')
+            ? (int) $request->getHeaderLine('Content-Length')
+            : null;
+
+        // Send the body as a string if the size is less than 1MB OR if the
+        // [curl][body_as_string] request value is set.
+        if (($size !== null && $size < 1000000) ||
+            !empty($options['_body_as_string'])
+        ) {
+            $conf[CURLOPT_POSTFIELDS] = (string) $request->getBody();
+            // Don't duplicate the Content-Length header
+            $this->removeHeader('Content-Length', $conf);
+            $this->removeHeader('Transfer-Encoding', $conf);
+        } else {
+            $conf[CURLOPT_UPLOAD] = true;
+            if ($size !== null) {
+                $conf[CURLOPT_INFILESIZE] = $size;
+                $this->removeHeader('Content-Length', $conf);
+            }
+            $body = $request->getBody();
+            if ($body->isSeekable()) {
+                $body->rewind();
+            }
+            $conf[CURLOPT_READFUNCTION] = function ($ch, $fd, $length) use ($body) {
+                return $body->read($length);
+            };
+        }
+
+        // If the Expect header is not present, prevent curl from adding it
+        if (!$request->hasHeader('Expect')) {
+            $conf[CURLOPT_HTTPHEADER][] = 'Expect:';
+        }
+
+        // cURL sometimes adds a content-type by default. Prevent this.
+        if (!$request->hasHeader('Content-Type')) {
+            $conf[CURLOPT_HTTPHEADER][] = 'Content-Type:';
+        }
+    }
+
+    private function applyHeaders(EasyHandle $easy, array &$conf)
+    {
+        foreach ($conf['_headers'] as $name => $values) {
+            foreach ($values as $value) {
+                $value = (string) $value;
+                if ($value === '') {
+                    // cURL requires a special format for empty headers.
+                    // See https://github.com/guzzle/guzzle/issues/1882 for more details.
+                    $conf[CURLOPT_HTTPHEADER][] = "$name;";
+                } else {
+                    $conf[CURLOPT_HTTPHEADER][] = "$name: $value";
+                }
+            }
+        }
+
+        // Remove the Accept header if one was not set
+        if (!$easy->request->hasHeader('Accept')) {
+            $conf[CURLOPT_HTTPHEADER][] = 'Accept:';
+        }
+    }
+
+    /**
+     * Remove a header from the options array.
+     *
+     * @param string $name    Case-insensitive header to remove
+     * @param array  $options Array of options to modify
+     */
+    private function removeHeader($name, array &$options)
+    {
+        foreach (array_keys($options['_headers']) as $key) {
+            if (!strcasecmp($key, $name)) {
+                unset($options['_headers'][$key]);
+                return;
+            }
+        }
+    }
+
+    private function applyHandlerOptions(EasyHandle $easy, array &$conf)
+    {
+        $options = $easy->options;
+        if (isset($options['verify'])) {
+            if ($options['verify'] === false) {
+                unset($conf[CURLOPT_CAINFO]);
+                $conf[CURLOPT_SSL_VERIFYHOST] = 0;
+                $conf[CURLOPT_SSL_VERIFYPEER] = false;
+            } else {
+                $conf[CURLOPT_SSL_VERIFYHOST] = 2;
+                $conf[CURLOPT_SSL_VERIFYPEER] = true;
+                if (is_string($options['verify'])) {
+                    // Throw an error if the file/folder/link path is not valid or doesn't exist.
+                    if (!file_exists($options['verify'])) {
+                        throw new \InvalidArgumentException(
+                            "SSL CA bundle not found: {$options['verify']}"
+                        );
+                    }
+                    // If it's a directory or a link to a directory use CURLOPT_CAPATH.
+                    // If not, it's probably a file, or a link to a file, so use CURLOPT_CAINFO.
+                    if (is_dir($options['verify']) ||
+                        (is_link($options['verify']) && is_dir(readlink($options['verify'])))) {
+                        $conf[CURLOPT_CAPATH] = $options['verify'];
+                    } else {
+                        $conf[CURLOPT_CAINFO] = $options['verify'];
+                    }
+                }
+            }
+        }
+
+        if (!empty($options['decode_content'])) {
+            $accept = $easy->request->getHeaderLine('Accept-Encoding');
+            if ($accept) {
+                $conf[CURLOPT_ENCODING] = $accept;
+            } else {
+                $conf[CURLOPT_ENCODING] = '';
+                // Don't let curl send the header over the wire
+                $conf[CURLOPT_HTTPHEADER][] = 'Accept-Encoding:';
+            }
+        }
+
+        if (isset($options['sink'])) {
+            $sink = $options['sink'];
+            if (!is_string($sink)) {
+                $sink = \GuzzleHttp\Psr7\stream_for($sink);
+            } elseif (!is_dir(dirname($sink))) {
+                // Ensure that the directory exists before failing in curl.
+                throw new \RuntimeException(sprintf(
+                    'Directory %s does not exist for sink value of %s',
+                    dirname($sink),
+                    $sink
+                ));
+            } else {
+                $sink = new LazyOpenStream($sink, 'w+');
+            }
+            $easy->sink = $sink;
+            $conf[CURLOPT_WRITEFUNCTION] = function ($ch, $write) use ($sink) {
+                return $sink->write($write);
+            };
+        } else {
+            // Use a default temp stream if no sink was set.
+            $conf[CURLOPT_FILE] = fopen('php://temp', 'w+');
+            $easy->sink = Psr7\stream_for($conf[CURLOPT_FILE]);
+        }
+        $timeoutRequiresNoSignal = false;
+        if (isset($options['timeout'])) {
+            $timeoutRequiresNoSignal |= $options['timeout'] < 1;
+            $conf[CURLOPT_TIMEOUT_MS] = $options['timeout'] * 1000;
+        }
+
+        // CURL default value is CURL_IPRESOLVE_WHATEVER
+        if (isset($options['force_ip_resolve'])) {
+            if ('v4' === $options['force_ip_resolve']) {
+                $conf[CURLOPT_IPRESOLVE] = CURL_IPRESOLVE_V4;
+            } elseif ('v6' === $options['force_ip_resolve']) {
+                $conf[CURLOPT_IPRESOLVE] = CURL_IPRESOLVE_V6;
+            }
+        }
+
+        if (isset($options['connect_timeout'])) {
+            $timeoutRequiresNoSignal |= $options['connect_timeout'] < 1;
+            $conf[CURLOPT_CONNECTTIMEOUT_MS] = $options['connect_timeout'] * 1000;
+        }
+
+        if ($timeoutRequiresNoSignal && strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
+            $conf[CURLOPT_NOSIGNAL] = true;
+        }
+
+        if (isset($options['proxy'])) {
+            if (!is_array($options['proxy'])) {
+                $conf[CURLOPT_PROXY] = $options['proxy'];
+            } else {
+                $scheme = $easy->request->getUri()->getScheme();
+                if (isset($options['proxy'][$scheme])) {
+                    $host = $easy->request->getUri()->getHost();
+                    if (!isset($options['proxy']['no']) ||
+                        !\GuzzleHttp\is_host_in_noproxy($host, $options['proxy']['no'])
+                    ) {
+                        $conf[CURLOPT_PROXY] = $options['proxy'][$scheme];
+                    }
+                }
+            }
+        }
+
+        if (isset($options['cert'])) {
+            $cert = $options['cert'];
+            if (is_array($cert)) {
+                $conf[CURLOPT_SSLCERTPASSWD] = $cert[1];
+                $cert = $cert[0];
+            }
+            if (!file_exists($cert)) {
+                throw new \InvalidArgumentException(
+                    "SSL certificate not found: {$cert}"
+                );
+            }
+            $conf[CURLOPT_SSLCERT] = $cert;
+        }
+
+        if (isset($options['ssl_key'])) {
+            $sslKey = $options['ssl_key'];
+            if (is_array($sslKey)) {
+                $conf[CURLOPT_SSLKEYPASSWD] = $sslKey[1];
+                $sslKey = $sslKey[0];
+            }
+            if (!file_exists($sslKey)) {
+                throw new \InvalidArgumentException(
+                    "SSL private key not found: {$sslKey}"
+                );
+            }
+            $conf[CURLOPT_SSLKEY] = $sslKey;
+        }
+
+        if (isset($options['progress'])) {
+            $progress = $options['progress'];
+            if (!is_callable($progress)) {
+                throw new \InvalidArgumentException(
+                    'progress client option must be callable'
+                );
+            }
+            $conf[CURLOPT_NOPROGRESS] = false;
+            $conf[CURLOPT_PROGRESSFUNCTION] = function () use ($progress) {
+                $args = func_get_args();
+                // PHP 5.5 pushed the handle onto the start of the args
+                if (is_resource($args[0])) {
+                    array_shift($args);
+                }
+                call_user_func_array($progress, $args);
+            };
+        }
+
+        if (!empty($options['debug'])) {
+            $conf[CURLOPT_STDERR] = \GuzzleHttp\debug_resource($options['debug']);
+            $conf[CURLOPT_VERBOSE] = true;
+        }
+    }
+
+    /**
+     * This function ensures that a response was set on a transaction. If one
+     * was not set, then the request is retried if possible. This error
+     * typically means you are sending a payload, curl encountered a
+     * "Connection died, retrying a fresh connect" error, tried to rewind the
+     * stream, and then encountered a "necessary data rewind wasn't possible"
+     * error, causing the request to be sent through curl_multi_info_read()
+     * without an error status.
+     */
+    private static function retryFailedRewind(
+        callable $handler,
+        EasyHandle $easy,
+        array $ctx
+    ) {
+        try {
+            // Only rewind if the body has been read from.
+            $body = $easy->request->getBody();
+            if ($body->tell() > 0) {
+                $body->rewind();
+            }
+        } catch (\RuntimeException $e) {
+            $ctx['error'] = 'The connection unexpectedly failed without '
+                . 'providing an error. The request would have been retried, '
+                . 'but attempting to rewind the request body failed. '
+                . 'Exception: ' . $e;
+            return self::createRejection($easy, $ctx);
+        }
+
+        // Retry no more than 3 times before giving up.
+        if (!isset($easy->options['_curl_retries'])) {
+            $easy->options['_curl_retries'] = 1;
+        } elseif ($easy->options['_curl_retries'] == 2) {
+            $ctx['error'] = 'The cURL request was retried 3 times '
+                . 'and did not succeed. The most likely reason for the failure '
+                . 'is that cURL was unable to rewind the body of the request '
+                . 'and subsequent retries resulted in the same error. Turn on '
+                . 'the debug option to see what went wrong. See '
+                . 'https://bugs.php.net/bug.php?id=47204 for more information.';
+            return self::createRejection($easy, $ctx);
+        } else {
+            $easy->options['_curl_retries']++;
+        }
+
+        return $handler($easy->request, $easy->options);
+    }
+
+    private function createHeaderFn(EasyHandle $easy)
+    {
+        if (isset($easy->options['on_headers'])) {
+            $onHeaders = $easy->options['on_headers'];
+
+            if (!is_callable($onHeaders)) {
+                throw new \InvalidArgumentException('on_headers must be callable');
+            }
+        } else {
+            $onHeaders = null;
+        }
+
+        return function ($ch, $h) use (
+            $onHeaders,
+            $easy,
+            &$startingResponse
+        ) {
+            $value = trim($h);
+            if ($value === '') {
+                $startingResponse = true;
+                $easy->createResponse();
+                if ($onHeaders !== null) {
+                    try {
+                        $onHeaders($easy->response);
+                    } catch (\Exception $e) {
+                        // Associate the exception with the handle and trigger
+                        // a curl header write error by returning 0.
+                        $easy->onHeadersException = $e;
+                        return -1;
+                    }
+                }
+            } elseif ($startingResponse) {
+                $startingResponse = false;
+                $easy->headers = [$value];
+            } else {
+                $easy->headers[] = $value;
+            }
+            return strlen($h);
+        };
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Handler/CurlFactoryInterface.php

@@ -0,0 +1,27 @@
+<?php
+namespace GuzzleHttp\Handler;
+
+use Psr\Http\Message\RequestInterface;
+
+interface CurlFactoryInterface
+{
+    /**
+     * Creates a cURL handle resource.
+     *
+     * @param RequestInterface $request Request
+     * @param array            $options Transfer options
+     *
+     * @return EasyHandle
+     * @throws \RuntimeException when an option cannot be applied
+     */
+    public function create(RequestInterface $request, array $options);
+
+    /**
+     * Release an easy handle, allowing it to be reused or closed.
+     *
+     * This function must call unset on the easy handle's "handle" property.
+     *
+     * @param EasyHandle $easy
+     */
+    public function release(EasyHandle $easy);
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Handler/CurlHandler.php

@@ -0,0 +1,45 @@
+<?php
+namespace GuzzleHttp\Handler;
+
+use GuzzleHttp\Psr7;
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * HTTP handler that uses cURL easy handles as a transport layer.
+ *
+ * When using the CurlHandler, custom curl options can be specified as an
+ * associative array of curl option constants mapping to values in the
+ * **curl** key of the "client" key of the request.
+ */
+class CurlHandler
+{
+    /** @var CurlFactoryInterface */
+    private $factory;
+
+    /**
+     * Accepts an associative array of options:
+     *
+     * - factory: Optional curl factory used to create cURL handles.
+     *
+     * @param array $options Array of options to use with the handler
+     */
+    public function __construct(array $options = [])
+    {
+        $this->factory = isset($options['handle_factory'])
+            ? $options['handle_factory']
+            : new CurlFactory(3);
+    }
+
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        if (isset($options['delay'])) {
+            usleep($options['delay'] * 1000);
+        }
+
+        $easy = $this->factory->create($request, $options);
+        curl_exec($easy->handle);
+        $easy->errno = curl_errno($easy->handle);
+
+        return CurlFactory::finish($this, $easy, $this->factory);
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Handler/CurlMultiHandler.php

@@ -0,0 +1,205 @@
+<?php
+namespace GuzzleHttp\Handler;
+
+use GuzzleHttp\Promise as P;
+use GuzzleHttp\Promise\Promise;
+use GuzzleHttp\Psr7;
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * Returns an asynchronous response using curl_multi_* functions.
+ *
+ * When using the CurlMultiHandler, custom curl options can be specified as an
+ * associative array of curl option constants mapping to values in the
+ * **curl** key of the provided request options.
+ *
+ * @property resource $_mh Internal use only. Lazy loaded multi-handle.
+ */
+class CurlMultiHandler
+{
+    /** @var CurlFactoryInterface */
+    private $factory;
+    private $selectTimeout;
+    private $active;
+    private $handles = [];
+    private $delays = [];
+
+    /**
+     * This handler accepts the following options:
+     *
+     * - handle_factory: An optional factory  used to create curl handles
+     * - select_timeout: Optional timeout (in seconds) to block before timing
+     *   out while selecting curl handles. Defaults to 1 second.
+     *
+     * @param array $options
+     */
+    public function __construct(array $options = [])
+    {
+        $this->factory = isset($options['handle_factory'])
+            ? $options['handle_factory'] : new CurlFactory(50);
+
+        if (isset($options['select_timeout'])) {
+            $this->selectTimeout = $options['select_timeout'];
+        } elseif ($selectTimeout = getenv('GUZZLE_CURL_SELECT_TIMEOUT')) {
+            $this->selectTimeout = $selectTimeout;
+        } else {
+            $this->selectTimeout = 1;
+        }
+    }
+
+    public function __get($name)
+    {
+        if ($name === '_mh') {
+            return $this->_mh = curl_multi_init();
+        }
+
+        throw new \BadMethodCallException();
+    }
+
+    public function __destruct()
+    {
+        if (isset($this->_mh)) {
+            curl_multi_close($this->_mh);
+            unset($this->_mh);
+        }
+    }
+
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        $easy = $this->factory->create($request, $options);
+        $id = (int) $easy->handle;
+
+        $promise = new Promise(
+            [$this, 'execute'],
+            function () use ($id) {
+                return $this->cancel($id);
+            }
+        );
+
+        $this->addRequest(['easy' => $easy, 'deferred' => $promise]);
+
+        return $promise;
+    }
+
+    /**
+     * Ticks the curl event loop.
+     */
+    public function tick()
+    {
+        // Add any delayed handles if needed.
+        if ($this->delays) {
+            $currentTime = \GuzzleHttp\_current_time();
+            foreach ($this->delays as $id => $delay) {
+                if ($currentTime >= $delay) {
+                    unset($this->delays[$id]);
+                    curl_multi_add_handle(
+                        $this->_mh,
+                        $this->handles[$id]['easy']->handle
+                    );
+                }
+            }
+        }
+
+        // Step through the task queue which may add additional requests.
+        P\queue()->run();
+
+        if ($this->active &&
+            curl_multi_select($this->_mh, $this->selectTimeout) === -1
+        ) {
+            // Perform a usleep if a select returns -1.
+            // See: https://bugs.php.net/bug.php?id=61141
+            usleep(250);
+        }
+
+        while (curl_multi_exec($this->_mh, $this->active) === CURLM_CALL_MULTI_PERFORM);
+
+        $this->processMessages();
+    }
+
+    /**
+     * Runs until all outstanding connections have completed.
+     */
+    public function execute()
+    {
+        $queue = P\queue();
+
+        while ($this->handles || !$queue->isEmpty()) {
+            // If there are no transfers, then sleep for the next delay
+            if (!$this->active && $this->delays) {
+                usleep($this->timeToNext());
+            }
+            $this->tick();
+        }
+    }
+
+    private function addRequest(array $entry)
+    {
+        $easy = $entry['easy'];
+        $id = (int) $easy->handle;
+        $this->handles[$id] = $entry;
+        if (empty($easy->options['delay'])) {
+            curl_multi_add_handle($this->_mh, $easy->handle);
+        } else {
+            $this->delays[$id] = \GuzzleHttp\_current_time() + ($easy->options['delay'] / 1000);
+        }
+    }
+
+    /**
+     * Cancels a handle from sending and removes references to it.
+     *
+     * @param int $id Handle ID to cancel and remove.
+     *
+     * @return bool True on success, false on failure.
+     */
+    private function cancel($id)
+    {
+        // Cannot cancel if it has been processed.
+        if (!isset($this->handles[$id])) {
+            return false;
+        }
+
+        $handle = $this->handles[$id]['easy']->handle;
+        unset($this->delays[$id], $this->handles[$id]);
+        curl_multi_remove_handle($this->_mh, $handle);
+        curl_close($handle);
+
+        return true;
+    }
+
+    private function processMessages()
+    {
+        while ($done = curl_multi_info_read($this->_mh)) {
+            $id = (int) $done['handle'];
+            curl_multi_remove_handle($this->_mh, $done['handle']);
+
+            if (!isset($this->handles[$id])) {
+                // Probably was cancelled.
+                continue;
+            }
+
+            $entry = $this->handles[$id];
+            unset($this->handles[$id], $this->delays[$id]);
+            $entry['easy']->errno = $done['result'];
+            $entry['deferred']->resolve(
+                CurlFactory::finish(
+                    $this,
+                    $entry['easy'],
+                    $this->factory
+                )
+            );
+        }
+    }
+
+    private function timeToNext()
+    {
+        $currentTime = \GuzzleHttp\_current_time();
+        $nextTime = PHP_INT_MAX;
+        foreach ($this->delays as $time) {
+            if ($time < $nextTime) {
+                $nextTime = $time;
+            }
+        }
+
+        return max(0, $nextTime - $currentTime) * 1000000;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Handler/EasyHandle.php

@@ -0,0 +1,92 @@
+<?php
+namespace GuzzleHttp\Handler;
+
+use GuzzleHttp\Psr7\Response;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Represents a cURL easy handle and the data it populates.
+ *
+ * @internal
+ */
+final class EasyHandle
+{
+    /** @var resource cURL resource */
+    public $handle;
+
+    /** @var StreamInterface Where data is being written */
+    public $sink;
+
+    /** @var array Received HTTP headers so far */
+    public $headers = [];
+
+    /** @var ResponseInterface Received response (if any) */
+    public $response;
+
+    /** @var RequestInterface Request being sent */
+    public $request;
+
+    /** @var array Request options */
+    public $options = [];
+
+    /** @var int cURL error number (if any) */
+    public $errno = 0;
+
+    /** @var \Exception Exception during on_headers (if any) */
+    public $onHeadersException;
+
+    /**
+     * Attach a response to the easy handle based on the received headers.
+     *
+     * @throws \RuntimeException if no headers have been received.
+     */
+    public function createResponse()
+    {
+        if (empty($this->headers)) {
+            throw new \RuntimeException('No headers have been received');
+        }
+
+        // HTTP-version SP status-code SP reason-phrase
+        $startLine = explode(' ', array_shift($this->headers), 3);
+        $headers = \GuzzleHttp\headers_from_lines($this->headers);
+        $normalizedKeys = \GuzzleHttp\normalize_header_keys($headers);
+
+        if (!empty($this->options['decode_content'])
+            && isset($normalizedKeys['content-encoding'])
+        ) {
+            $headers['x-encoded-content-encoding']
+                = $headers[$normalizedKeys['content-encoding']];
+            unset($headers[$normalizedKeys['content-encoding']]);
+            if (isset($normalizedKeys['content-length'])) {
+                $headers['x-encoded-content-length']
+                    = $headers[$normalizedKeys['content-length']];
+
+                $bodyLength = (int) $this->sink->getSize();
+                if ($bodyLength) {
+                    $headers[$normalizedKeys['content-length']] = $bodyLength;
+                } else {
+                    unset($headers[$normalizedKeys['content-length']]);
+                }
+            }
+        }
+
+        // Attach a response to the easy handle with the parsed headers.
+        $this->response = new Response(
+            $startLine[1],
+            $headers,
+            $this->sink,
+            substr($startLine[0], 5),
+            isset($startLine[2]) ? (string) $startLine[2] : null
+        );
+    }
+
+    public function __get($name)
+    {
+        $msg = $name === 'handle'
+            ? 'The EasyHandle has been released'
+            : 'Invalid property: ' . $name;
+        throw new \BadMethodCallException($msg);
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Handler/MockHandler.php

@@ -0,0 +1,190 @@
+<?php
+namespace GuzzleHttp\Handler;
+
+use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\HandlerStack;
+use GuzzleHttp\Promise\PromiseInterface;
+use GuzzleHttp\Promise\RejectedPromise;
+use GuzzleHttp\TransferStats;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Handler that returns responses or throw exceptions from a queue.
+ */
+class MockHandler implements \Countable
+{
+    private $queue = [];
+    private $lastRequest;
+    private $lastOptions;
+    private $onFulfilled;
+    private $onRejected;
+
+    /**
+     * Creates a new MockHandler that uses the default handler stack list of
+     * middlewares.
+     *
+     * @param array $queue Array of responses, callables, or exceptions.
+     * @param callable $onFulfilled Callback to invoke when the return value is fulfilled.
+     * @param callable $onRejected  Callback to invoke when the return value is rejected.
+     *
+     * @return HandlerStack
+     */
+    public static function createWithMiddleware(
+        array $queue = null,
+        callable $onFulfilled = null,
+        callable $onRejected = null
+    ) {
+        return HandlerStack::create(new self($queue, $onFulfilled, $onRejected));
+    }
+
+    /**
+     * The passed in value must be an array of
+     * {@see Psr7\Http\Message\ResponseInterface} objects, Exceptions,
+     * callables, or Promises.
+     *
+     * @param array $queue
+     * @param callable $onFulfilled Callback to invoke when the return value is fulfilled.
+     * @param callable $onRejected  Callback to invoke when the return value is rejected.
+     */
+    public function __construct(
+        array $queue = null,
+        callable $onFulfilled = null,
+        callable $onRejected = null
+    ) {
+        $this->onFulfilled = $onFulfilled;
+        $this->onRejected = $onRejected;
+
+        if ($queue) {
+            call_user_func_array([$this, 'append'], $queue);
+        }
+    }
+
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        if (!$this->queue) {
+            throw new \OutOfBoundsException('Mock queue is empty');
+        }
+
+        if (isset($options['delay'])) {
+            usleep($options['delay'] * 1000);
+        }
+
+        $this->lastRequest = $request;
+        $this->lastOptions = $options;
+        $response = array_shift($this->queue);
+
+        if (isset($options['on_headers'])) {
+            if (!is_callable($options['on_headers'])) {
+                throw new \InvalidArgumentException('on_headers must be callable');
+            }
+            try {
+                $options['on_headers']($response);
+            } catch (\Exception $e) {
+                $msg = 'An error was encountered during the on_headers event';
+                $response = new RequestException($msg, $request, $response, $e);
+            }
+        }
+
+        if (is_callable($response)) {
+            $response = call_user_func($response, $request, $options);
+        }
+
+        $response = $response instanceof \Exception
+            ? \GuzzleHttp\Promise\rejection_for($response)
+            : \GuzzleHttp\Promise\promise_for($response);
+
+        return $response->then(
+            function ($value) use ($request, $options) {
+                $this->invokeStats($request, $options, $value);
+                if ($this->onFulfilled) {
+                    call_user_func($this->onFulfilled, $value);
+                }
+                if (isset($options['sink'])) {
+                    $contents = (string) $value->getBody();
+                    $sink = $options['sink'];
+
+                    if (is_resource($sink)) {
+                        fwrite($sink, $contents);
+                    } elseif (is_string($sink)) {
+                        file_put_contents($sink, $contents);
+                    } elseif ($sink instanceof \Psr\Http\Message\StreamInterface) {
+                        $sink->write($contents);
+                    }
+                }
+
+                return $value;
+            },
+            function ($reason) use ($request, $options) {
+                $this->invokeStats($request, $options, null, $reason);
+                if ($this->onRejected) {
+                    call_user_func($this->onRejected, $reason);
+                }
+                return \GuzzleHttp\Promise\rejection_for($reason);
+            }
+        );
+    }
+
+    /**
+     * Adds one or more variadic requests, exceptions, callables, or promises
+     * to the queue.
+     */
+    public function append()
+    {
+        foreach (func_get_args() as $value) {
+            if ($value instanceof ResponseInterface
+                || $value instanceof \Exception
+                || $value instanceof PromiseInterface
+                || is_callable($value)
+            ) {
+                $this->queue[] = $value;
+            } else {
+                throw new \InvalidArgumentException('Expected a response or '
+                    . 'exception. Found ' . \GuzzleHttp\describe_type($value));
+            }
+        }
+    }
+
+    /**
+     * Get the last received request.
+     *
+     * @return RequestInterface
+     */
+    public function getLastRequest()
+    {
+        return $this->lastRequest;
+    }
+
+    /**
+     * Get the last received request options.
+     *
+     * @return array
+     */
+    public function getLastOptions()
+    {
+        return $this->lastOptions;
+    }
+
+    /**
+     * Returns the number of remaining items in the queue.
+     *
+     * @return int
+     */
+    public function count()
+    {
+        return count($this->queue);
+    }
+
+    private function invokeStats(
+        RequestInterface $request,
+        array $options,
+        ResponseInterface $response = null,
+        $reason = null
+    ) {
+        if (isset($options['on_stats'])) {
+            $transferTime = isset($options['transfer_time']) ? $options['transfer_time'] : 0;
+            $stats = new TransferStats($request, $response, $transferTime, $reason);
+            call_user_func($options['on_stats'], $stats);
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Handler/Proxy.php

@@ -0,0 +1,55 @@
+<?php
+namespace GuzzleHttp\Handler;
+
+use GuzzleHttp\RequestOptions;
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * Provides basic proxies for handlers.
+ */
+class Proxy
+{
+    /**
+     * Sends synchronous requests to a specific handler while sending all other
+     * requests to another handler.
+     *
+     * @param callable $default Handler used for normal responses
+     * @param callable $sync    Handler used for synchronous responses.
+     *
+     * @return callable Returns the composed handler.
+     */
+    public static function wrapSync(
+        callable $default,
+        callable $sync
+    ) {
+        return function (RequestInterface $request, array $options) use ($default, $sync) {
+            return empty($options[RequestOptions::SYNCHRONOUS])
+                ? $default($request, $options)
+                : $sync($request, $options);
+        };
+    }
+
+    /**
+     * Sends streaming requests to a streaming compatible handler while sending
+     * all other requests to a default handler.
+     *
+     * This, for example, could be useful for taking advantage of the
+     * performance benefits of curl while still supporting true streaming
+     * through the StreamHandler.
+     *
+     * @param callable $default   Handler used for non-streaming responses
+     * @param callable $streaming Handler used for streaming responses
+     *
+     * @return callable Returns the composed handler.
+     */
+    public static function wrapStreaming(
+        callable $default,
+        callable $streaming
+    ) {
+        return function (RequestInterface $request, array $options) use ($default, $streaming) {
+            return empty($options['stream'])
+                ? $default($request, $options)
+                : $streaming($request, $options);
+        };
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Handler/StreamHandler.php

@@ -0,0 +1,544 @@
+<?php
+namespace GuzzleHttp\Handler;
+
+use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\ConnectException;
+use GuzzleHttp\Promise\FulfilledPromise;
+use GuzzleHttp\Promise\PromiseInterface;
+use GuzzleHttp\Psr7;
+use GuzzleHttp\TransferStats;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * HTTP handler that uses PHP's HTTP stream wrapper.
+ */
+class StreamHandler
+{
+    private $lastHeaders = [];
+
+    /**
+     * Sends an HTTP request.
+     *
+     * @param RequestInterface $request Request to send.
+     * @param array            $options Request transfer options.
+     *
+     * @return PromiseInterface
+     */
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        // Sleep if there is a delay specified.
+        if (isset($options['delay'])) {
+            usleep($options['delay'] * 1000);
+        }
+
+        $startTime = isset($options['on_stats']) ? \GuzzleHttp\_current_time() : null;
+
+        try {
+            // Does not support the expect header.
+            $request = $request->withoutHeader('Expect');
+
+            // Append a content-length header if body size is zero to match
+            // cURL's behavior.
+            if (0 === $request->getBody()->getSize()) {
+                $request = $request->withHeader('Content-Length', '0');
+            }
+
+            return $this->createResponse(
+                $request,
+                $options,
+                $this->createStream($request, $options),
+                $startTime
+            );
+        } catch (\InvalidArgumentException $e) {
+            throw $e;
+        } catch (\Exception $e) {
+            // Determine if the error was a networking error.
+            $message = $e->getMessage();
+            // This list can probably get more comprehensive.
+            if (strpos($message, 'getaddrinfo') // DNS lookup failed
+                || strpos($message, 'Connection refused')
+                || strpos($message, "couldn't connect to host") // error on HHVM
+                || strpos($message, "connection attempt failed")
+            ) {
+                $e = new ConnectException($e->getMessage(), $request, $e);
+            }
+            $e = RequestException::wrapException($request, $e);
+            $this->invokeStats($options, $request, $startTime, null, $e);
+
+            return \GuzzleHttp\Promise\rejection_for($e);
+        }
+    }
+
+    private function invokeStats(
+        array $options,
+        RequestInterface $request,
+        $startTime,
+        ResponseInterface $response = null,
+        $error = null
+    ) {
+        if (isset($options['on_stats'])) {
+            $stats = new TransferStats(
+                $request,
+                $response,
+                \GuzzleHttp\_current_time() - $startTime,
+                $error,
+                []
+            );
+            call_user_func($options['on_stats'], $stats);
+        }
+    }
+
+    private function createResponse(
+        RequestInterface $request,
+        array $options,
+        $stream,
+        $startTime
+    ) {
+        $hdrs = $this->lastHeaders;
+        $this->lastHeaders = [];
+        $parts = explode(' ', array_shift($hdrs), 3);
+        $ver = explode('/', $parts[0])[1];
+        $status = $parts[1];
+        $reason = isset($parts[2]) ? $parts[2] : null;
+        $headers = \GuzzleHttp\headers_from_lines($hdrs);
+        list($stream, $headers) = $this->checkDecode($options, $headers, $stream);
+        $stream = Psr7\stream_for($stream);
+        $sink = $stream;
+
+        if (strcasecmp('HEAD', $request->getMethod())) {
+            $sink = $this->createSink($stream, $options);
+        }
+
+        $response = new Psr7\Response($status, $headers, $sink, $ver, $reason);
+
+        if (isset($options['on_headers'])) {
+            try {
+                $options['on_headers']($response);
+            } catch (\Exception $e) {
+                $msg = 'An error was encountered during the on_headers event';
+                $ex = new RequestException($msg, $request, $response, $e);
+                return \GuzzleHttp\Promise\rejection_for($ex);
+            }
+        }
+
+        // Do not drain when the request is a HEAD request because they have
+        // no body.
+        if ($sink !== $stream) {
+            $this->drain(
+                $stream,
+                $sink,
+                $response->getHeaderLine('Content-Length')
+            );
+        }
+
+        $this->invokeStats($options, $request, $startTime, $response, null);
+
+        return new FulfilledPromise($response);
+    }
+
+    private function createSink(StreamInterface $stream, array $options)
+    {
+        if (!empty($options['stream'])) {
+            return $stream;
+        }
+
+        $sink = isset($options['sink'])
+            ? $options['sink']
+            : fopen('php://temp', 'r+');
+
+        return is_string($sink)
+            ? new Psr7\LazyOpenStream($sink, 'w+')
+            : Psr7\stream_for($sink);
+    }
+
+    private function checkDecode(array $options, array $headers, $stream)
+    {
+        // Automatically decode responses when instructed.
+        if (!empty($options['decode_content'])) {
+            $normalizedKeys = \GuzzleHttp\normalize_header_keys($headers);
+            if (isset($normalizedKeys['content-encoding'])) {
+                $encoding = $headers[$normalizedKeys['content-encoding']];
+                if ($encoding[0] === 'gzip' || $encoding[0] === 'deflate') {
+                    $stream = new Psr7\InflateStream(
+                        Psr7\stream_for($stream)
+                    );
+                    $headers['x-encoded-content-encoding']
+                        = $headers[$normalizedKeys['content-encoding']];
+                    // Remove content-encoding header
+                    unset($headers[$normalizedKeys['content-encoding']]);
+                    // Fix content-length header
+                    if (isset($normalizedKeys['content-length'])) {
+                        $headers['x-encoded-content-length']
+                            = $headers[$normalizedKeys['content-length']];
+
+                        $length = (int) $stream->getSize();
+                        if ($length === 0) {
+                            unset($headers[$normalizedKeys['content-length']]);
+                        } else {
+                            $headers[$normalizedKeys['content-length']] = [$length];
+                        }
+                    }
+                }
+            }
+        }
+
+        return [$stream, $headers];
+    }
+
+    /**
+     * Drains the source stream into the "sink" client option.
+     *
+     * @param StreamInterface $source
+     * @param StreamInterface $sink
+     * @param string          $contentLength Header specifying the amount of
+     *                                       data to read.
+     *
+     * @return StreamInterface
+     * @throws \RuntimeException when the sink option is invalid.
+     */
+    private function drain(
+        StreamInterface $source,
+        StreamInterface $sink,
+        $contentLength
+    ) {
+        // If a content-length header is provided, then stop reading once
+        // that number of bytes has been read. This can prevent infinitely
+        // reading from a stream when dealing with servers that do not honor
+        // Connection: Close headers.
+        Psr7\copy_to_stream(
+            $source,
+            $sink,
+            (strlen($contentLength) > 0 && (int) $contentLength > 0) ? (int) $contentLength : -1
+        );
+
+        $sink->seek(0);
+        $source->close();
+
+        return $sink;
+    }
+
+    /**
+     * Create a resource and check to ensure it was created successfully
+     *
+     * @param callable $callback Callable that returns stream resource
+     *
+     * @return resource
+     * @throws \RuntimeException on error
+     */
+    private function createResource(callable $callback)
+    {
+        $errors = null;
+        set_error_handler(function ($_, $msg, $file, $line) use (&$errors) {
+            $errors[] = [
+                'message' => $msg,
+                'file'    => $file,
+                'line'    => $line
+            ];
+            return true;
+        });
+
+        $resource = $callback();
+        restore_error_handler();
+
+        if (!$resource) {
+            $message = 'Error creating resource: ';
+            foreach ($errors as $err) {
+                foreach ($err as $key => $value) {
+                    $message .= "[$key] $value" . PHP_EOL;
+                }
+            }
+            throw new \RuntimeException(trim($message));
+        }
+
+        return $resource;
+    }
+
+    private function createStream(RequestInterface $request, array $options)
+    {
+        static $methods;
+        if (!$methods) {
+            $methods = array_flip(get_class_methods(__CLASS__));
+        }
+
+        // HTTP/1.1 streams using the PHP stream wrapper require a
+        // Connection: close header
+        if ($request->getProtocolVersion() == '1.1'
+            && !$request->hasHeader('Connection')
+        ) {
+            $request = $request->withHeader('Connection', 'close');
+        }
+
+        // Ensure SSL is verified by default
+        if (!isset($options['verify'])) {
+            $options['verify'] = true;
+        }
+
+        $params = [];
+        $context = $this->getDefaultContext($request);
+
+        if (isset($options['on_headers']) && !is_callable($options['on_headers'])) {
+            throw new \InvalidArgumentException('on_headers must be callable');
+        }
+
+        if (!empty($options)) {
+            foreach ($options as $key => $value) {
+                $method = "add_{$key}";
+                if (isset($methods[$method])) {
+                    $this->{$method}($request, $context, $value, $params);
+                }
+            }
+        }
+
+        if (isset($options['stream_context'])) {
+            if (!is_array($options['stream_context'])) {
+                throw new \InvalidArgumentException('stream_context must be an array');
+            }
+            $context = array_replace_recursive(
+                $context,
+                $options['stream_context']
+            );
+        }
+
+        // Microsoft NTLM authentication only supported with curl handler
+        if (isset($options['auth'])
+            && is_array($options['auth'])
+            && isset($options['auth'][2])
+            && 'ntlm' == $options['auth'][2]
+        ) {
+            throw new \InvalidArgumentException('Microsoft NTLM authentication only supported with curl handler');
+        }
+
+        $uri = $this->resolveHost($request, $options);
+
+        $context = $this->createResource(
+            function () use ($context, $params) {
+                return stream_context_create($context, $params);
+            }
+        );
+
+        return $this->createResource(
+            function () use ($uri, &$http_response_header, $context, $options) {
+                $resource = fopen((string) $uri, 'r', null, $context);
+                $this->lastHeaders = $http_response_header;
+
+                if (isset($options['read_timeout'])) {
+                    $readTimeout = $options['read_timeout'];
+                    $sec = (int) $readTimeout;
+                    $usec = ($readTimeout - $sec) * 100000;
+                    stream_set_timeout($resource, $sec, $usec);
+                }
+
+                return $resource;
+            }
+        );
+    }
+
+    private function resolveHost(RequestInterface $request, array $options)
+    {
+        $uri = $request->getUri();
+
+        if (isset($options['force_ip_resolve']) && !filter_var($uri->getHost(), FILTER_VALIDATE_IP)) {
+            if ('v4' === $options['force_ip_resolve']) {
+                $records = dns_get_record($uri->getHost(), DNS_A);
+                if (!isset($records[0]['ip'])) {
+                    throw new ConnectException(
+                        sprintf(
+                            "Could not resolve IPv4 address for host '%s'",
+                            $uri->getHost()
+                        ),
+                        $request
+                    );
+                }
+                $uri = $uri->withHost($records[0]['ip']);
+            } elseif ('v6' === $options['force_ip_resolve']) {
+                $records = dns_get_record($uri->getHost(), DNS_AAAA);
+                if (!isset($records[0]['ipv6'])) {
+                    throw new ConnectException(
+                        sprintf(
+                            "Could not resolve IPv6 address for host '%s'",
+                            $uri->getHost()
+                        ),
+                        $request
+                    );
+                }
+                $uri = $uri->withHost('[' . $records[0]['ipv6'] . ']');
+            }
+        }
+
+        return $uri;
+    }
+
+    private function getDefaultContext(RequestInterface $request)
+    {
+        $headers = '';
+        foreach ($request->getHeaders() as $name => $value) {
+            foreach ($value as $val) {
+                $headers .= "$name: $val\r\n";
+            }
+        }
+
+        $context = [
+            'http' => [
+                'method'           => $request->getMethod(),
+                'header'           => $headers,
+                'protocol_version' => $request->getProtocolVersion(),
+                'ignore_errors'    => true,
+                'follow_location'  => 0,
+            ],
+        ];
+
+        $body = (string) $request->getBody();
+
+        if (!empty($body)) {
+            $context['http']['content'] = $body;
+            // Prevent the HTTP handler from adding a Content-Type header.
+            if (!$request->hasHeader('Content-Type')) {
+                $context['http']['header'] .= "Content-Type:\r\n";
+            }
+        }
+
+        $context['http']['header'] = rtrim($context['http']['header']);
+
+        return $context;
+    }
+
+    private function add_proxy(RequestInterface $request, &$options, $value, &$params)
+    {
+        if (!is_array($value)) {
+            $options['http']['proxy'] = $value;
+        } else {
+            $scheme = $request->getUri()->getScheme();
+            if (isset($value[$scheme])) {
+                if (!isset($value['no'])
+                    || !\GuzzleHttp\is_host_in_noproxy(
+                        $request->getUri()->getHost(),
+                        $value['no']
+                    )
+                ) {
+                    $options['http']['proxy'] = $value[$scheme];
+                }
+            }
+        }
+    }
+
+    private function add_timeout(RequestInterface $request, &$options, $value, &$params)
+    {
+        if ($value > 0) {
+            $options['http']['timeout'] = $value;
+        }
+    }
+
+    private function add_verify(RequestInterface $request, &$options, $value, &$params)
+    {
+        if ($value === true) {
+            // PHP 5.6 or greater will find the system cert by default. When
+            // < 5.6, use the Guzzle bundled cacert.
+            if (PHP_VERSION_ID < 50600) {
+                $options['ssl']['cafile'] = \GuzzleHttp\default_ca_bundle();
+            }
+        } elseif (is_string($value)) {
+            $options['ssl']['cafile'] = $value;
+            if (!file_exists($value)) {
+                throw new \RuntimeException("SSL CA bundle not found: $value");
+            }
+        } elseif ($value === false) {
+            $options['ssl']['verify_peer'] = false;
+            $options['ssl']['verify_peer_name'] = false;
+            return;
+        } else {
+            throw new \InvalidArgumentException('Invalid verify request option');
+        }
+
+        $options['ssl']['verify_peer'] = true;
+        $options['ssl']['verify_peer_name'] = true;
+        $options['ssl']['allow_self_signed'] = false;
+    }
+
+    private function add_cert(RequestInterface $request, &$options, $value, &$params)
+    {
+        if (is_array($value)) {
+            $options['ssl']['passphrase'] = $value[1];
+            $value = $value[0];
+        }
+
+        if (!file_exists($value)) {
+            throw new \RuntimeException("SSL certificate not found: {$value}");
+        }
+
+        $options['ssl']['local_cert'] = $value;
+    }
+
+    private function add_progress(RequestInterface $request, &$options, $value, &$params)
+    {
+        $this->addNotification(
+            $params,
+            function ($code, $a, $b, $c, $transferred, $total) use ($value) {
+                if ($code == STREAM_NOTIFY_PROGRESS) {
+                    $value($total, $transferred, null, null);
+                }
+            }
+        );
+    }
+
+    private function add_debug(RequestInterface $request, &$options, $value, &$params)
+    {
+        if ($value === false) {
+            return;
+        }
+
+        static $map = [
+            STREAM_NOTIFY_CONNECT       => 'CONNECT',
+            STREAM_NOTIFY_AUTH_REQUIRED => 'AUTH_REQUIRED',
+            STREAM_NOTIFY_AUTH_RESULT   => 'AUTH_RESULT',
+            STREAM_NOTIFY_MIME_TYPE_IS  => 'MIME_TYPE_IS',
+            STREAM_NOTIFY_FILE_SIZE_IS  => 'FILE_SIZE_IS',
+            STREAM_NOTIFY_REDIRECTED    => 'REDIRECTED',
+            STREAM_NOTIFY_PROGRESS      => 'PROGRESS',
+            STREAM_NOTIFY_FAILURE       => 'FAILURE',
+            STREAM_NOTIFY_COMPLETED     => 'COMPLETED',
+            STREAM_NOTIFY_RESOLVE       => 'RESOLVE',
+        ];
+        static $args = ['severity', 'message', 'message_code',
+            'bytes_transferred', 'bytes_max'];
+
+        $value = \GuzzleHttp\debug_resource($value);
+        $ident = $request->getMethod() . ' ' . $request->getUri()->withFragment('');
+        $this->addNotification(
+            $params,
+            function () use ($ident, $value, $map, $args) {
+                $passed = func_get_args();
+                $code = array_shift($passed);
+                fprintf($value, '<%s> [%s] ', $ident, $map[$code]);
+                foreach (array_filter($passed) as $i => $v) {
+                    fwrite($value, $args[$i] . ': "' . $v . '" ');
+                }
+                fwrite($value, "\n");
+            }
+        );
+    }
+
+    private function addNotification(array &$params, callable $notify)
+    {
+        // Wrap the existing function if needed.
+        if (!isset($params['notification'])) {
+            $params['notification'] = $notify;
+        } else {
+            $params['notification'] = $this->callArray([
+                $params['notification'],
+                $notify
+            ]);
+        }
+    }
+
+    private function callArray(array $functions)
+    {
+        return function () use ($functions) {
+            $args = func_get_args();
+            foreach ($functions as $fn) {
+                call_user_func_array($fn, $args);
+            }
+        };
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/HandlerStack.php

@@ -0,0 +1,273 @@
+<?php
+namespace GuzzleHttp;
+
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * Creates a composed Guzzle handler function by stacking middlewares on top of
+ * an HTTP handler function.
+ */
+class HandlerStack
+{
+    /** @var callable */
+    private $handler;
+
+    /** @var array */
+    private $stack = [];
+
+    /** @var callable|null */
+    private $cached;
+
+    /**
+     * Creates a default handler stack that can be used by clients.
+     *
+     * The returned handler will wrap the provided handler or use the most
+     * appropriate default handler for your system. The returned HandlerStack has
+     * support for cookies, redirects, HTTP error exceptions, and preparing a body
+     * before sending.
+     *
+     * The returned handler stack can be passed to a client in the "handler"
+     * option.
+     *
+     * @param callable $handler HTTP handler function to use with the stack. If no
+     *                          handler is provided, the best handler for your
+     *                          system will be utilized.
+     *
+     * @return HandlerStack
+     */
+    public static function create(callable $handler = null)
+    {
+        $stack = new self($handler ?: choose_handler());
+        $stack->push(Middleware::httpErrors(), 'http_errors');
+        $stack->push(Middleware::redirect(), 'allow_redirects');
+        $stack->push(Middleware::cookies(), 'cookies');
+        $stack->push(Middleware::prepareBody(), 'prepare_body');
+
+        return $stack;
+    }
+
+    /**
+     * @param callable $handler Underlying HTTP handler.
+     */
+    public function __construct(callable $handler = null)
+    {
+        $this->handler = $handler;
+    }
+
+    /**
+     * Invokes the handler stack as a composed handler
+     *
+     * @param RequestInterface $request
+     * @param array            $options
+     */
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        $handler = $this->resolve();
+
+        return $handler($request, $options);
+    }
+
+    /**
+     * Dumps a string representation of the stack.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        $depth = 0;
+        $stack = [];
+        if ($this->handler) {
+            $stack[] = "0) Handler: " . $this->debugCallable($this->handler);
+        }
+
+        $result = '';
+        foreach (array_reverse($this->stack) as $tuple) {
+            $depth++;
+            $str = "{$depth}) Name: '{$tuple[1]}', ";
+            $str .= "Function: " . $this->debugCallable($tuple[0]);
+            $result = "> {$str}\n{$result}";
+            $stack[] = $str;
+        }
+
+        foreach (array_keys($stack) as $k) {
+            $result .= "< {$stack[$k]}\n";
+        }
+
+        return $result;
+    }
+
+    /**
+     * Set the HTTP handler that actually returns a promise.
+     *
+     * @param callable $handler Accepts a request and array of options and
+     *                          returns a Promise.
+     */
+    public function setHandler(callable $handler)
+    {
+        $this->handler = $handler;
+        $this->cached = null;
+    }
+
+    /**
+     * Returns true if the builder has a handler.
+     *
+     * @return bool
+     */
+    public function hasHandler()
+    {
+        return (bool) $this->handler;
+    }
+
+    /**
+     * Unshift a middleware to the bottom of the stack.
+     *
+     * @param callable $middleware Middleware function
+     * @param string   $name       Name to register for this middleware.
+     */
+    public function unshift(callable $middleware, $name = null)
+    {
+        array_unshift($this->stack, [$middleware, $name]);
+        $this->cached = null;
+    }
+
+    /**
+     * Push a middleware to the top of the stack.
+     *
+     * @param callable $middleware Middleware function
+     * @param string   $name       Name to register for this middleware.
+     */
+    public function push(callable $middleware, $name = '')
+    {
+        $this->stack[] = [$middleware, $name];
+        $this->cached = null;
+    }
+
+    /**
+     * Add a middleware before another middleware by name.
+     *
+     * @param string   $findName   Middleware to find
+     * @param callable $middleware Middleware function
+     * @param string   $withName   Name to register for this middleware.
+     */
+    public function before($findName, callable $middleware, $withName = '')
+    {
+        $this->splice($findName, $withName, $middleware, true);
+    }
+
+    /**
+     * Add a middleware after another middleware by name.
+     *
+     * @param string   $findName   Middleware to find
+     * @param callable $middleware Middleware function
+     * @param string   $withName   Name to register for this middleware.
+     */
+    public function after($findName, callable $middleware, $withName = '')
+    {
+        $this->splice($findName, $withName, $middleware, false);
+    }
+
+    /**
+     * Remove a middleware by instance or name from the stack.
+     *
+     * @param callable|string $remove Middleware to remove by instance or name.
+     */
+    public function remove($remove)
+    {
+        $this->cached = null;
+        $idx = is_callable($remove) ? 0 : 1;
+        $this->stack = array_values(array_filter(
+            $this->stack,
+            function ($tuple) use ($idx, $remove) {
+                return $tuple[$idx] !== $remove;
+            }
+        ));
+    }
+
+    /**
+     * Compose the middleware and handler into a single callable function.
+     *
+     * @return callable
+     */
+    public function resolve()
+    {
+        if (!$this->cached) {
+            if (!($prev = $this->handler)) {
+                throw new \LogicException('No handler has been specified');
+            }
+
+            foreach (array_reverse($this->stack) as $fn) {
+                $prev = $fn[0]($prev);
+            }
+
+            $this->cached = $prev;
+        }
+
+        return $this->cached;
+    }
+
+    /**
+     * @param string $name
+     * @return int
+     */
+    private function findByName($name)
+    {
+        foreach ($this->stack as $k => $v) {
+            if ($v[1] === $name) {
+                return $k;
+            }
+        }
+
+        throw new \InvalidArgumentException("Middleware not found: $name");
+    }
+
+    /**
+     * Splices a function into the middleware list at a specific position.
+     *
+     * @param string   $findName
+     * @param string   $withName
+     * @param callable $middleware
+     * @param bool     $before
+     */
+    private function splice($findName, $withName, callable $middleware, $before)
+    {
+        $this->cached = null;
+        $idx = $this->findByName($findName);
+        $tuple = [$middleware, $withName];
+
+        if ($before) {
+            if ($idx === 0) {
+                array_unshift($this->stack, $tuple);
+            } else {
+                $replacement = [$tuple, $this->stack[$idx]];
+                array_splice($this->stack, $idx, 1, $replacement);
+            }
+        } elseif ($idx === count($this->stack) - 1) {
+            $this->stack[] = $tuple;
+        } else {
+            $replacement = [$this->stack[$idx], $tuple];
+            array_splice($this->stack, $idx, 1, $replacement);
+        }
+    }
+
+    /**
+     * Provides a debug string for a given callable.
+     *
+     * @param array|callable $fn Function to write as a string.
+     *
+     * @return string
+     */
+    private function debugCallable($fn)
+    {
+        if (is_string($fn)) {
+            return "callable({$fn})";
+        }
+
+        if (is_array($fn)) {
+            return is_string($fn[0])
+                ? "callable({$fn[0]}::{$fn[1]})"
+                : "callable(['" . get_class($fn[0]) . "', '{$fn[1]}'])";
+        }
+
+        return 'callable(' . spl_object_hash($fn) . ')';
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/MessageFormatter.php

@@ -0,0 +1,180 @@
+<?php
+namespace GuzzleHttp;
+
+use Psr\Http\Message\MessageInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Formats log messages using variable substitutions for requests, responses,
+ * and other transactional data.
+ *
+ * The following variable substitutions are supported:
+ *
+ * - {request}:        Full HTTP request message
+ * - {response}:       Full HTTP response message
+ * - {ts}:             ISO 8601 date in GMT
+ * - {date_iso_8601}   ISO 8601 date in GMT
+ * - {date_common_log} Apache common log date using the configured timezone.
+ * - {host}:           Host of the request
+ * - {method}:         Method of the request
+ * - {uri}:            URI of the request
+ * - {version}:        Protocol version
+ * - {target}:         Request target of the request (path + query + fragment)
+ * - {hostname}:       Hostname of the machine that sent the request
+ * - {code}:           Status code of the response (if available)
+ * - {phrase}:         Reason phrase of the response  (if available)
+ * - {error}:          Any error messages (if available)
+ * - {req_header_*}:   Replace `*` with the lowercased name of a request header to add to the message
+ * - {res_header_*}:   Replace `*` with the lowercased name of a response header to add to the message
+ * - {req_headers}:    Request headers
+ * - {res_headers}:    Response headers
+ * - {req_body}:       Request body
+ * - {res_body}:       Response body
+ */
+class MessageFormatter
+{
+    /**
+     * Apache Common Log Format.
+     * @link http://httpd.apache.org/docs/2.4/logs.html#common
+     * @var string
+     */
+    const CLF = "{hostname} {req_header_User-Agent} - [{date_common_log}] \"{method} {target} HTTP/{version}\" {code} {res_header_Content-Length}";
+    const DEBUG = ">>>>>>>>\n{request}\n<<<<<<<<\n{response}\n--------\n{error}";
+    const SHORT = '[{ts}] "{method} {target} HTTP/{version}" {code}';
+
+    /** @var string Template used to format log messages */
+    private $template;
+
+    /**
+     * @param string $template Log message template
+     */
+    public function __construct($template = self::CLF)
+    {
+        $this->template = $template ?: self::CLF;
+    }
+
+    /**
+     * Returns a formatted message string.
+     *
+     * @param RequestInterface  $request  Request that was sent
+     * @param ResponseInterface $response Response that was received
+     * @param \Exception        $error    Exception that was received
+     *
+     * @return string
+     */
+    public function format(
+        RequestInterface $request,
+        ResponseInterface $response = null,
+        \Exception $error = null
+    ) {
+        $cache = [];
+
+        return preg_replace_callback(
+            '/{\s*([A-Za-z_\-\.0-9]+)\s*}/',
+            function (array $matches) use ($request, $response, $error, &$cache) {
+                if (isset($cache[$matches[1]])) {
+                    return $cache[$matches[1]];
+                }
+
+                $result = '';
+                switch ($matches[1]) {
+                    case 'request':
+                        $result = Psr7\str($request);
+                        break;
+                    case 'response':
+                        $result = $response ? Psr7\str($response) : '';
+                        break;
+                    case 'req_headers':
+                        $result = trim($request->getMethod()
+                                . ' ' . $request->getRequestTarget())
+                            . ' HTTP/' . $request->getProtocolVersion() . "\r\n"
+                            . $this->headers($request);
+                        break;
+                    case 'res_headers':
+                        $result = $response ?
+                            sprintf(
+                                'HTTP/%s %d %s',
+                                $response->getProtocolVersion(),
+                                $response->getStatusCode(),
+                                $response->getReasonPhrase()
+                            ) . "\r\n" . $this->headers($response)
+                            : 'NULL';
+                        break;
+                    case 'req_body':
+                        $result = $request->getBody();
+                        break;
+                    case 'res_body':
+                        $result = $response ? $response->getBody() : 'NULL';
+                        break;
+                    case 'ts':
+                    case 'date_iso_8601':
+                        $result = gmdate('c');
+                        break;
+                    case 'date_common_log':
+                        $result = date('d/M/Y:H:i:s O');
+                        break;
+                    case 'method':
+                        $result = $request->getMethod();
+                        break;
+                    case 'version':
+                        $result = $request->getProtocolVersion();
+                        break;
+                    case 'uri':
+                    case 'url':
+                        $result = $request->getUri();
+                        break;
+                    case 'target':
+                        $result = $request->getRequestTarget();
+                        break;
+                    case 'req_version':
+                        $result = $request->getProtocolVersion();
+                        break;
+                    case 'res_version':
+                        $result = $response
+                            ? $response->getProtocolVersion()
+                            : 'NULL';
+                        break;
+                    case 'host':
+                        $result = $request->getHeaderLine('Host');
+                        break;
+                    case 'hostname':
+                        $result = gethostname();
+                        break;
+                    case 'code':
+                        $result = $response ? $response->getStatusCode() : 'NULL';
+                        break;
+                    case 'phrase':
+                        $result = $response ? $response->getReasonPhrase() : 'NULL';
+                        break;
+                    case 'error':
+                        $result = $error ? $error->getMessage() : 'NULL';
+                        break;
+                    default:
+                        // handle prefixed dynamic headers
+                        if (strpos($matches[1], 'req_header_') === 0) {
+                            $result = $request->getHeaderLine(substr($matches[1], 11));
+                        } elseif (strpos($matches[1], 'res_header_') === 0) {
+                            $result = $response
+                                ? $response->getHeaderLine(substr($matches[1], 11))
+                                : 'NULL';
+                        }
+                }
+
+                $cache[$matches[1]] = $result;
+                return $result;
+            },
+            $this->template
+        );
+    }
+
+    private function headers(MessageInterface $message)
+    {
+        $result = '';
+        foreach ($message->getHeaders() as $name => $values) {
+            $result .= $name . ': ' . implode(', ', $values) . "\r\n";
+        }
+
+        return trim($result);
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Middleware.php

@@ -0,0 +1,254 @@
+<?php
+namespace GuzzleHttp;
+
+use GuzzleHttp\Cookie\CookieJarInterface;
+use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Promise\RejectedPromise;
+use GuzzleHttp\Psr7;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Functions used to create and wrap handlers with handler middleware.
+ */
+final class Middleware
+{
+    /**
+     * Middleware that adds cookies to requests.
+     *
+     * The options array must be set to a CookieJarInterface in order to use
+     * cookies. This is typically handled for you by a client.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function cookies()
+    {
+        return function (callable $handler) {
+            return function ($request, array $options) use ($handler) {
+                if (empty($options['cookies'])) {
+                    return $handler($request, $options);
+                } elseif (!($options['cookies'] instanceof CookieJarInterface)) {
+                    throw new \InvalidArgumentException('cookies must be an instance of GuzzleHttp\Cookie\CookieJarInterface');
+                }
+                $cookieJar = $options['cookies'];
+                $request = $cookieJar->withCookieHeader($request);
+                return $handler($request, $options)
+                    ->then(
+                        function ($response) use ($cookieJar, $request) {
+                            $cookieJar->extractCookies($request, $response);
+                            return $response;
+                        }
+                    );
+            };
+        };
+    }
+
+    /**
+     * Middleware that throws exceptions for 4xx or 5xx responses when the
+     * "http_error" request option is set to true.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function httpErrors()
+    {
+        return function (callable $handler) {
+            return function ($request, array $options) use ($handler) {
+                if (empty($options['http_errors'])) {
+                    return $handler($request, $options);
+                }
+                return $handler($request, $options)->then(
+                    function (ResponseInterface $response) use ($request) {
+                        $code = $response->getStatusCode();
+                        if ($code < 400) {
+                            return $response;
+                        }
+                        throw RequestException::create($request, $response);
+                    }
+                );
+            };
+        };
+    }
+
+    /**
+     * Middleware that pushes history data to an ArrayAccess container.
+     *
+     * @param array|\ArrayAccess $container Container to hold the history (by reference).
+     *
+     * @return callable Returns a function that accepts the next handler.
+     * @throws \InvalidArgumentException if container is not an array or ArrayAccess.
+     */
+    public static function history(&$container)
+    {
+        if (!is_array($container) && !$container instanceof \ArrayAccess) {
+            throw new \InvalidArgumentException('history container must be an array or object implementing ArrayAccess');
+        }
+
+        return function (callable $handler) use (&$container) {
+            return function ($request, array $options) use ($handler, &$container) {
+                return $handler($request, $options)->then(
+                    function ($value) use ($request, &$container, $options) {
+                        $container[] = [
+                            'request'  => $request,
+                            'response' => $value,
+                            'error'    => null,
+                            'options'  => $options
+                        ];
+                        return $value;
+                    },
+                    function ($reason) use ($request, &$container, $options) {
+                        $container[] = [
+                            'request'  => $request,
+                            'response' => null,
+                            'error'    => $reason,
+                            'options'  => $options
+                        ];
+                        return \GuzzleHttp\Promise\rejection_for($reason);
+                    }
+                );
+            };
+        };
+    }
+
+    /**
+     * Middleware that invokes a callback before and after sending a request.
+     *
+     * The provided listener cannot modify or alter the response. It simply
+     * "taps" into the chain to be notified before returning the promise. The
+     * before listener accepts a request and options array, and the after
+     * listener accepts a request, options array, and response promise.
+     *
+     * @param callable $before Function to invoke before forwarding the request.
+     * @param callable $after  Function invoked after forwarding.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function tap(callable $before = null, callable $after = null)
+    {
+        return function (callable $handler) use ($before, $after) {
+            return function ($request, array $options) use ($handler, $before, $after) {
+                if ($before) {
+                    $before($request, $options);
+                }
+                $response = $handler($request, $options);
+                if ($after) {
+                    $after($request, $options, $response);
+                }
+                return $response;
+            };
+        };
+    }
+
+    /**
+     * Middleware that handles request redirects.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function redirect()
+    {
+        return function (callable $handler) {
+            return new RedirectMiddleware($handler);
+        };
+    }
+
+    /**
+     * Middleware that retries requests based on the boolean result of
+     * invoking the provided "decider" function.
+     *
+     * If no delay function is provided, a simple implementation of exponential
+     * backoff will be utilized.
+     *
+     * @param callable $decider Function that accepts the number of retries,
+     *                          a request, [response], and [exception] and
+     *                          returns true if the request is to be retried.
+     * @param callable $delay   Function that accepts the number of retries and
+     *                          returns the number of milliseconds to delay.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function retry(callable $decider, callable $delay = null)
+    {
+        return function (callable $handler) use ($decider, $delay) {
+            return new RetryMiddleware($decider, $handler, $delay);
+        };
+    }
+
+    /**
+     * Middleware that logs requests, responses, and errors using a message
+     * formatter.
+     *
+     * @param LoggerInterface  $logger Logs messages.
+     * @param MessageFormatter $formatter Formatter used to create message strings.
+     * @param string           $logLevel Level at which to log requests.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function log(LoggerInterface $logger, MessageFormatter $formatter, $logLevel = 'info' /* \Psr\Log\LogLevel::INFO */)
+    {
+        return function (callable $handler) use ($logger, $formatter, $logLevel) {
+            return function ($request, array $options) use ($handler, $logger, $formatter, $logLevel) {
+                return $handler($request, $options)->then(
+                    function ($response) use ($logger, $request, $formatter, $logLevel) {
+                        $message = $formatter->format($request, $response);
+                        $logger->log($logLevel, $message);
+                        return $response;
+                    },
+                    function ($reason) use ($logger, $request, $formatter) {
+                        $response = $reason instanceof RequestException
+                            ? $reason->getResponse()
+                            : null;
+                        $message = $formatter->format($request, $response, $reason);
+                        $logger->notice($message);
+                        return \GuzzleHttp\Promise\rejection_for($reason);
+                    }
+                );
+            };
+        };
+    }
+
+    /**
+     * This middleware adds a default content-type if possible, a default
+     * content-length or transfer-encoding header, and the expect header.
+     *
+     * @return callable
+     */
+    public static function prepareBody()
+    {
+        return function (callable $handler) {
+            return new PrepareBodyMiddleware($handler);
+        };
+    }
+
+    /**
+     * Middleware that applies a map function to the request before passing to
+     * the next handler.
+     *
+     * @param callable $fn Function that accepts a RequestInterface and returns
+     *                     a RequestInterface.
+     * @return callable
+     */
+    public static function mapRequest(callable $fn)
+    {
+        return function (callable $handler) use ($fn) {
+            return function ($request, array $options) use ($handler, $fn) {
+                return $handler($fn($request), $options);
+            };
+        };
+    }
+
+    /**
+     * Middleware that applies a map function to the resolved promise's
+     * response.
+     *
+     * @param callable $fn Function that accepts a ResponseInterface and
+     *                     returns a ResponseInterface.
+     * @return callable
+     */
+    public static function mapResponse(callable $fn)
+    {
+        return function (callable $handler) use ($fn) {
+            return function ($request, array $options) use ($handler, $fn) {
+                return $handler($request, $options)->then($fn);
+            };
+        };
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/Pool.php

@@ -0,0 +1,123 @@
+<?php
+namespace GuzzleHttp;
+
+use GuzzleHttp\Promise\PromisorInterface;
+use Psr\Http\Message\RequestInterface;
+use GuzzleHttp\Promise\EachPromise;
+
+/**
+ * Sends an iterator of requests concurrently using a capped pool size.
+ *
+ * The pool will read from an iterator until it is cancelled or until the
+ * iterator is consumed. When a request is yielded, the request is sent after
+ * applying the "request_options" request options (if provided in the ctor).
+ *
+ * When a function is yielded by the iterator, the function is provided the
+ * "request_options" array that should be merged on top of any existing
+ * options, and the function MUST then return a wait-able promise.
+ */
+class Pool implements PromisorInterface
+{
+    /** @var EachPromise */
+    private $each;
+
+    /**
+     * @param ClientInterface $client   Client used to send the requests.
+     * @param array|\Iterator $requests Requests or functions that return
+     *                                  requests to send concurrently.
+     * @param array           $config   Associative array of options
+     *     - concurrency: (int) Maximum number of requests to send concurrently
+     *     - options: Array of request options to apply to each request.
+     *     - fulfilled: (callable) Function to invoke when a request completes.
+     *     - rejected: (callable) Function to invoke when a request is rejected.
+     */
+    public function __construct(
+        ClientInterface $client,
+        $requests,
+        array $config = []
+    ) {
+        // Backwards compatibility.
+        if (isset($config['pool_size'])) {
+            $config['concurrency'] = $config['pool_size'];
+        } elseif (!isset($config['concurrency'])) {
+            $config['concurrency'] = 25;
+        }
+
+        if (isset($config['options'])) {
+            $opts = $config['options'];
+            unset($config['options']);
+        } else {
+            $opts = [];
+        }
+
+        $iterable = \GuzzleHttp\Promise\iter_for($requests);
+        $requests = function () use ($iterable, $client, $opts) {
+            foreach ($iterable as $key => $rfn) {
+                if ($rfn instanceof RequestInterface) {
+                    yield $key => $client->sendAsync($rfn, $opts);
+                } elseif (is_callable($rfn)) {
+                    yield $key => $rfn($opts);
+                } else {
+                    throw new \InvalidArgumentException('Each value yielded by '
+                        . 'the iterator must be a Psr7\Http\Message\RequestInterface '
+                        . 'or a callable that returns a promise that fulfills '
+                        . 'with a Psr7\Message\Http\ResponseInterface object.');
+                }
+            }
+        };
+
+        $this->each = new EachPromise($requests(), $config);
+    }
+
+    public function promise()
+    {
+        return $this->each->promise();
+    }
+
+    /**
+     * Sends multiple requests concurrently and returns an array of responses
+     * and exceptions that uses the same ordering as the provided requests.
+     *
+     * IMPORTANT: This method keeps every request and response in memory, and
+     * as such, is NOT recommended when sending a large number or an
+     * indeterminate number of requests concurrently.
+     *
+     * @param ClientInterface $client   Client used to send the requests
+     * @param array|\Iterator $requests Requests to send concurrently.
+     * @param array           $options  Passes through the options available in
+     *                                  {@see GuzzleHttp\Pool::__construct}
+     *
+     * @return array Returns an array containing the response or an exception
+     *               in the same order that the requests were sent.
+     * @throws \InvalidArgumentException if the event format is incorrect.
+     */
+    public static function batch(
+        ClientInterface $client,
+        $requests,
+        array $options = []
+    ) {
+        $res = [];
+        self::cmpCallback($options, 'fulfilled', $res);
+        self::cmpCallback($options, 'rejected', $res);
+        $pool = new static($client, $requests, $options);
+        $pool->promise()->wait();
+        ksort($res);
+
+        return $res;
+    }
+
+    private static function cmpCallback(array &$options, $name, array &$results)
+    {
+        if (!isset($options[$name])) {
+            $options[$name] = function ($v, $k) use (&$results) {
+                $results[$k] = $v;
+            };
+        } else {
+            $currentFn = $options[$name];
+            $options[$name] = function ($v, $k) use (&$results, $currentFn) {
+                $currentFn($v, $k);
+                $results[$k] = $v;
+            };
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php

@@ -0,0 +1,106 @@
+<?php
+namespace GuzzleHttp;
+
+use GuzzleHttp\Promise\PromiseInterface;
+use GuzzleHttp\Psr7;
+use Psr\Http\Message\RequestInterface;
+
+/**
+ * Prepares requests that contain a body, adding the Content-Length,
+ * Content-Type, and Expect headers.
+ */
+class PrepareBodyMiddleware
+{
+    /** @var callable  */
+    private $nextHandler;
+
+    /**
+     * @param callable $nextHandler Next handler to invoke.
+     */
+    public function __construct(callable $nextHandler)
+    {
+        $this->nextHandler = $nextHandler;
+    }
+
+    /**
+     * @param RequestInterface $request
+     * @param array            $options
+     *
+     * @return PromiseInterface
+     */
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        $fn = $this->nextHandler;
+
+        // Don't do anything if the request has no body.
+        if ($request->getBody()->getSize() === 0) {
+            return $fn($request, $options);
+        }
+
+        $modify = [];
+
+        // Add a default content-type if possible.
+        if (!$request->hasHeader('Content-Type')) {
+            if ($uri = $request->getBody()->getMetadata('uri')) {
+                if ($type = Psr7\mimetype_from_filename($uri)) {
+                    $modify['set_headers']['Content-Type'] = $type;
+                }
+            }
+        }
+
+        // Add a default content-length or transfer-encoding header.
+        if (!$request->hasHeader('Content-Length')
+            && !$request->hasHeader('Transfer-Encoding')
+        ) {
+            $size = $request->getBody()->getSize();
+            if ($size !== null) {
+                $modify['set_headers']['Content-Length'] = $size;
+            } else {
+                $modify['set_headers']['Transfer-Encoding'] = 'chunked';
+            }
+        }
+
+        // Add the expect header if needed.
+        $this->addExpectHeader($request, $options, $modify);
+
+        return $fn(Psr7\modify_request($request, $modify), $options);
+    }
+
+    private function addExpectHeader(
+        RequestInterface $request,
+        array $options,
+        array &$modify
+    ) {
+        // Determine if the Expect header should be used
+        if ($request->hasHeader('Expect')) {
+            return;
+        }
+
+        $expect = isset($options['expect']) ? $options['expect'] : null;
+
+        // Return if disabled or if you're not using HTTP/1.1 or HTTP/2.0
+        if ($expect === false || $request->getProtocolVersion() < 1.1) {
+            return;
+        }
+
+        // The expect header is unconditionally enabled
+        if ($expect === true) {
+            $modify['set_headers']['Expect'] = '100-Continue';
+            return;
+        }
+
+        // By default, send the expect header when the payload is > 1mb
+        if ($expect === null) {
+            $expect = 1048576;
+        }
+
+        // Always add if the body cannot be rewound, the size cannot be
+        // determined, or the size is greater than the cutoff threshold
+        $body = $request->getBody();
+        $size = $body->getSize();
+
+        if ($size === null || $size >= (int) $expect || !$body->isSeekable()) {
+            $modify['set_headers']['Expect'] = '100-Continue';
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/RedirectMiddleware.php

@@ -0,0 +1,237 @@
+<?php
+namespace GuzzleHttp;
+
+use GuzzleHttp\Exception\BadResponseException;
+use GuzzleHttp\Exception\TooManyRedirectsException;
+use GuzzleHttp\Promise\PromiseInterface;
+use GuzzleHttp\Psr7;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Request redirect middleware.
+ *
+ * Apply this middleware like other middleware using
+ * {@see GuzzleHttp\Middleware::redirect()}.
+ */
+class RedirectMiddleware
+{
+    const HISTORY_HEADER = 'X-Guzzle-Redirect-History';
+
+    const STATUS_HISTORY_HEADER = 'X-Guzzle-Redirect-Status-History';
+
+    public static $defaultSettings = [
+        'max'             => 5,
+        'protocols'       => ['http', 'https'],
+        'strict'          => false,
+        'referer'         => false,
+        'track_redirects' => false,
+    ];
+
+    /** @var callable  */
+    private $nextHandler;
+
+    /**
+     * @param callable $nextHandler Next handler to invoke.
+     */
+    public function __construct(callable $nextHandler)
+    {
+        $this->nextHandler = $nextHandler;
+    }
+
+    /**
+     * @param RequestInterface $request
+     * @param array            $options
+     *
+     * @return PromiseInterface
+     */
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        $fn = $this->nextHandler;
+
+        if (empty($options['allow_redirects'])) {
+            return $fn($request, $options);
+        }
+
+        if ($options['allow_redirects'] === true) {
+            $options['allow_redirects'] = self::$defaultSettings;
+        } elseif (!is_array($options['allow_redirects'])) {
+            throw new \InvalidArgumentException('allow_redirects must be true, false, or array');
+        } else {
+            // Merge the default settings with the provided settings
+            $options['allow_redirects'] += self::$defaultSettings;
+        }
+
+        if (empty($options['allow_redirects']['max'])) {
+            return $fn($request, $options);
+        }
+
+        return $fn($request, $options)
+            ->then(function (ResponseInterface $response) use ($request, $options) {
+                return $this->checkRedirect($request, $options, $response);
+            });
+    }
+
+    /**
+     * @param RequestInterface  $request
+     * @param array             $options
+     * @param ResponseInterface|PromiseInterface $response
+     *
+     * @return ResponseInterface|PromiseInterface
+     */
+    public function checkRedirect(
+        RequestInterface $request,
+        array $options,
+        ResponseInterface $response
+    ) {
+        if (substr($response->getStatusCode(), 0, 1) != '3'
+            || !$response->hasHeader('Location')
+        ) {
+            return $response;
+        }
+
+        $this->guardMax($request, $options);
+        $nextRequest = $this->modifyRequest($request, $options, $response);
+
+        if (isset($options['allow_redirects']['on_redirect'])) {
+            call_user_func(
+                $options['allow_redirects']['on_redirect'],
+                $request,
+                $response,
+                $nextRequest->getUri()
+            );
+        }
+
+        /** @var PromiseInterface|ResponseInterface $promise */
+        $promise = $this($nextRequest, $options);
+
+        // Add headers to be able to track history of redirects.
+        if (!empty($options['allow_redirects']['track_redirects'])) {
+            return $this->withTracking(
+                $promise,
+                (string) $nextRequest->getUri(),
+                $response->getStatusCode()
+            );
+        }
+
+        return $promise;
+    }
+
+    private function withTracking(PromiseInterface $promise, $uri, $statusCode)
+    {
+        return $promise->then(
+            function (ResponseInterface $response) use ($uri, $statusCode) {
+                // Note that we are pushing to the front of the list as this
+                // would be an earlier response than what is currently present
+                // in the history header.
+                $historyHeader = $response->getHeader(self::HISTORY_HEADER);
+                $statusHeader = $response->getHeader(self::STATUS_HISTORY_HEADER);
+                array_unshift($historyHeader, $uri);
+                array_unshift($statusHeader, $statusCode);
+                return $response->withHeader(self::HISTORY_HEADER, $historyHeader)
+                                ->withHeader(self::STATUS_HISTORY_HEADER, $statusHeader);
+            }
+        );
+    }
+
+    private function guardMax(RequestInterface $request, array &$options)
+    {
+        $current = isset($options['__redirect_count'])
+            ? $options['__redirect_count']
+            : 0;
+        $options['__redirect_count'] = $current + 1;
+        $max = $options['allow_redirects']['max'];
+
+        if ($options['__redirect_count'] > $max) {
+            throw new TooManyRedirectsException(
+                "Will not follow more than {$max} redirects",
+                $request
+            );
+        }
+    }
+
+    /**
+     * @param RequestInterface  $request
+     * @param array             $options
+     * @param ResponseInterface $response
+     *
+     * @return RequestInterface
+     */
+    public function modifyRequest(
+        RequestInterface $request,
+        array $options,
+        ResponseInterface $response
+    ) {
+        // Request modifications to apply.
+        $modify = [];
+        $protocols = $options['allow_redirects']['protocols'];
+
+        // Use a GET request if this is an entity enclosing request and we are
+        // not forcing RFC compliance, but rather emulating what all browsers
+        // would do.
+        $statusCode = $response->getStatusCode();
+        if ($statusCode == 303 ||
+            ($statusCode <= 302 && $request->getBody() && !$options['allow_redirects']['strict'])
+        ) {
+            $modify['method'] = 'GET';
+            $modify['body'] = '';
+        }
+
+        $modify['uri'] = $this->redirectUri($request, $response, $protocols);
+        Psr7\rewind_body($request);
+
+        // Add the Referer header if it is told to do so and only
+        // add the header if we are not redirecting from https to http.
+        if ($options['allow_redirects']['referer']
+            && $modify['uri']->getScheme() === $request->getUri()->getScheme()
+        ) {
+            $uri = $request->getUri()->withUserInfo('');
+            $modify['set_headers']['Referer'] = (string) $uri;
+        } else {
+            $modify['remove_headers'][] = 'Referer';
+        }
+
+        // Remove Authorization header if host is different.
+        if ($request->getUri()->getHost() !== $modify['uri']->getHost()) {
+            $modify['remove_headers'][] = 'Authorization';
+        }
+
+        return Psr7\modify_request($request, $modify);
+    }
+
+    /**
+     * Set the appropriate URL on the request based on the location header
+     *
+     * @param RequestInterface  $request
+     * @param ResponseInterface $response
+     * @param array             $protocols
+     *
+     * @return UriInterface
+     */
+    private function redirectUri(
+        RequestInterface $request,
+        ResponseInterface $response,
+        array $protocols
+    ) {
+        $location = Psr7\UriResolver::resolve(
+            $request->getUri(),
+            new Psr7\Uri($response->getHeaderLine('Location'))
+        );
+
+        // Ensure that the redirect URI is allowed based on the protocols.
+        if (!in_array($location->getScheme(), $protocols)) {
+            throw new BadResponseException(
+                sprintf(
+                    'Redirect URI, %s, does not use one of the allowed redirect protocols: %s',
+                    $location,
+                    implode(', ', $protocols)
+                ),
+                $request,
+                $response
+            );
+        }
+
+        return $location;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/RequestOptions.php

@@ -0,0 +1,255 @@
+<?php
+namespace GuzzleHttp;
+
+/**
+ * This class contains a list of built-in Guzzle request options.
+ *
+ * More documentation for each option can be found at http://guzzlephp.org/.
+ *
+ * @link http://docs.guzzlephp.org/en/v6/request-options.html
+ */
+final class RequestOptions
+{
+    /**
+     * allow_redirects: (bool|array) Controls redirect behavior. Pass false
+     * to disable redirects, pass true to enable redirects, pass an
+     * associative to provide custom redirect settings. Defaults to "false".
+     * This option only works if your handler has the RedirectMiddleware. When
+     * passing an associative array, you can provide the following key value
+     * pairs:
+     *
+     * - max: (int, default=5) maximum number of allowed redirects.
+     * - strict: (bool, default=false) Set to true to use strict redirects
+     *   meaning redirect POST requests with POST requests vs. doing what most
+     *   browsers do which is redirect POST requests with GET requests
+     * - referer: (bool, default=false) Set to true to enable the Referer
+     *   header.
+     * - protocols: (array, default=['http', 'https']) Allowed redirect
+     *   protocols.
+     * - on_redirect: (callable) PHP callable that is invoked when a redirect
+     *   is encountered. The callable is invoked with the request, the redirect
+     *   response that was received, and the effective URI. Any return value
+     *   from the on_redirect function is ignored.
+     */
+    const ALLOW_REDIRECTS = 'allow_redirects';
+
+    /**
+     * auth: (array) Pass an array of HTTP authentication parameters to use
+     * with the request. The array must contain the username in index [0],
+     * the password in index [1], and you can optionally provide a built-in
+     * authentication type in index [2]. Pass null to disable authentication
+     * for a request.
+     */
+    const AUTH = 'auth';
+
+    /**
+     * body: (resource|string|null|int|float|StreamInterface|callable|\Iterator)
+     * Body to send in the request.
+     */
+    const BODY = 'body';
+
+    /**
+     * cert: (string|array) Set to a string to specify the path to a file
+     * containing a PEM formatted SSL client side certificate. If a password
+     * is required, then set cert to an array containing the path to the PEM
+     * file in the first array element followed by the certificate password
+     * in the second array element.
+     */
+    const CERT = 'cert';
+
+    /**
+     * cookies: (bool|GuzzleHttp\Cookie\CookieJarInterface, default=false)
+     * Specifies whether or not cookies are used in a request or what cookie
+     * jar to use or what cookies to send. This option only works if your
+     * handler has the `cookie` middleware. Valid values are `false` and
+     * an instance of {@see GuzzleHttp\Cookie\CookieJarInterface}.
+     */
+    const COOKIES = 'cookies';
+
+    /**
+     * connect_timeout: (float, default=0) Float describing the number of
+     * seconds to wait while trying to connect to a server. Use 0 to wait
+     * indefinitely (the default behavior).
+     */
+    const CONNECT_TIMEOUT = 'connect_timeout';
+
+    /**
+     * debug: (bool|resource) Set to true or set to a PHP stream returned by
+     * fopen()  enable debug output with the HTTP handler used to send a
+     * request.
+     */
+    const DEBUG = 'debug';
+
+    /**
+     * decode_content: (bool, default=true) Specify whether or not
+     * Content-Encoding responses (gzip, deflate, etc.) are automatically
+     * decoded.
+     */
+    const DECODE_CONTENT = 'decode_content';
+
+    /**
+     * delay: (int) The amount of time to delay before sending in milliseconds.
+     */
+    const DELAY = 'delay';
+
+    /**
+     * expect: (bool|integer) Controls the behavior of the
+     * "Expect: 100-Continue" header.
+     *
+     * Set to `true` to enable the "Expect: 100-Continue" header for all
+     * requests that sends a body. Set to `false` to disable the
+     * "Expect: 100-Continue" header for all requests. Set to a number so that
+     * the size of the payload must be greater than the number in order to send
+     * the Expect header. Setting to a number will send the Expect header for
+     * all requests in which the size of the payload cannot be determined or
+     * where the body is not rewindable.
+     *
+     * By default, Guzzle will add the "Expect: 100-Continue" header when the
+     * size of the body of a request is greater than 1 MB and a request is
+     * using HTTP/1.1.
+     */
+    const EXPECT = 'expect';
+
+    /**
+     * form_params: (array) Associative array of form field names to values
+     * where each value is a string or array of strings. Sets the Content-Type
+     * header to application/x-www-form-urlencoded when no Content-Type header
+     * is already present.
+     */
+    const FORM_PARAMS = 'form_params';
+
+    /**
+     * headers: (array) Associative array of HTTP headers. Each value MUST be
+     * a string or array of strings.
+     */
+    const HEADERS = 'headers';
+
+    /**
+     * http_errors: (bool, default=true) Set to false to disable exceptions
+     * when a non- successful HTTP response is received. By default,
+     * exceptions will be thrown for 4xx and 5xx responses. This option only
+     * works if your handler has the `httpErrors` middleware.
+     */
+    const HTTP_ERRORS = 'http_errors';
+
+    /**
+     * json: (mixed) Adds JSON data to a request. The provided value is JSON
+     * encoded and a Content-Type header of application/json will be added to
+     * the request if no Content-Type header is already present.
+     */
+    const JSON = 'json';
+
+    /**
+     * multipart: (array) Array of associative arrays, each containing a
+     * required "name" key mapping to the form field, name, a required
+     * "contents" key mapping to a StreamInterface|resource|string, an
+     * optional "headers" associative array of custom headers, and an
+     * optional "filename" key mapping to a string to send as the filename in
+     * the part. If no "filename" key is present, then no "filename" attribute
+     * will be added to the part.
+     */
+    const MULTIPART = 'multipart';
+
+    /**
+     * on_headers: (callable) A callable that is invoked when the HTTP headers
+     * of the response have been received but the body has not yet begun to
+     * download.
+     */
+    const ON_HEADERS = 'on_headers';
+
+    /**
+     * on_stats: (callable) allows you to get access to transfer statistics of
+     * a request and access the lower level transfer details of the handler
+     * associated with your client. ``on_stats`` is a callable that is invoked
+     * when a handler has finished sending a request. The callback is invoked
+     * with transfer statistics about the request, the response received, or
+     * the error encountered. Included in the data is the total amount of time
+     * taken to send the request.
+     */
+    const ON_STATS = 'on_stats';
+
+    /**
+     * progress: (callable) Defines a function to invoke when transfer
+     * progress is made. The function accepts the following positional
+     * arguments: the total number of bytes expected to be downloaded, the
+     * number of bytes downloaded so far, the number of bytes expected to be
+     * uploaded, the number of bytes uploaded so far.
+     */
+    const PROGRESS = 'progress';
+
+    /**
+     * proxy: (string|array) Pass a string to specify an HTTP proxy, or an
+     * array to specify different proxies for different protocols (where the
+     * key is the protocol and the value is a proxy string).
+     */
+    const PROXY = 'proxy';
+
+    /**
+     * query: (array|string) Associative array of query string values to add
+     * to the request. This option uses PHP's http_build_query() to create
+     * the string representation. Pass a string value if you need more
+     * control than what this method provides
+     */
+    const QUERY = 'query';
+
+    /**
+     * sink: (resource|string|StreamInterface) Where the data of the
+     * response is written to. Defaults to a PHP temp stream. Providing a
+     * string will write data to a file by the given name.
+     */
+    const SINK = 'sink';
+
+    /**
+     * synchronous: (bool) Set to true to inform HTTP handlers that you intend
+     * on waiting on the response. This can be useful for optimizations. Note
+     * that a promise is still returned if you are using one of the async
+     * client methods.
+     */
+    const SYNCHRONOUS = 'synchronous';
+
+    /**
+     * ssl_key: (array|string) Specify the path to a file containing a private
+     * SSL key in PEM format. If a password is required, then set to an array
+     * containing the path to the SSL key in the first array element followed
+     * by the password required for the certificate in the second element.
+     */
+    const SSL_KEY = 'ssl_key';
+
+    /**
+     * stream: Set to true to attempt to stream a response rather than
+     * download it all up-front.
+     */
+    const STREAM = 'stream';
+
+    /**
+     * verify: (bool|string, default=true) Describes the SSL certificate
+     * verification behavior of a request. Set to true to enable SSL
+     * certificate verification using the system CA bundle when available
+     * (the default). Set to false to disable certificate verification (this
+     * is insecure!). Set to a string to provide the path to a CA bundle on
+     * disk to enable verification using a custom certificate.
+     */
+    const VERIFY = 'verify';
+
+    /**
+     * timeout: (float, default=0) Float describing the timeout of the
+     * request in seconds. Use 0 to wait indefinitely (the default behavior).
+     */
+    const TIMEOUT = 'timeout';
+
+    /**
+     * read_timeout: (float, default=default_socket_timeout ini setting) Float describing
+     * the body read timeout, for stream requests.
+     */
+    const READ_TIMEOUT = 'read_timeout';
+
+    /**
+     * version: (float) Specifies the HTTP protocol version to attempt to use.
+     */
+    const VERSION = 'version';
+
+    /**
+     * force_ip_resolve: (bool) Force client to use only ipv4 or ipv6 protocol
+     */
+    const FORCE_IP_RESOLVE = 'force_ip_resolve';
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/RetryMiddleware.php

@@ -0,0 +1,115 @@
+<?php
+namespace GuzzleHttp;
+
+use GuzzleHttp\Promise\PromiseInterface;
+use GuzzleHttp\Promise\RejectedPromise;
+use GuzzleHttp\Psr7;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Middleware that retries requests based on the boolean result of
+ * invoking the provided "decider" function.
+ */
+class RetryMiddleware
+{
+    /** @var callable  */
+    private $nextHandler;
+
+    /** @var callable */
+    private $decider;
+
+    /** @var callable */
+    private $delay;
+
+    /**
+     * @param callable $decider     Function that accepts the number of retries,
+     *                              a request, [response], and [exception] and
+     *                              returns true if the request is to be
+     *                              retried.
+     * @param callable $nextHandler Next handler to invoke.
+     * @param callable $delay       Function that accepts the number of retries
+     *                              and [response] and returns the number of
+     *                              milliseconds to delay.
+     */
+    public function __construct(
+        callable $decider,
+        callable $nextHandler,
+        callable $delay = null
+    ) {
+        $this->decider = $decider;
+        $this->nextHandler = $nextHandler;
+        $this->delay = $delay ?: __CLASS__ . '::exponentialDelay';
+    }
+
+    /**
+     * Default exponential backoff delay function.
+     *
+     * @param int $retries
+     *
+     * @return int
+     */
+    public static function exponentialDelay($retries)
+    {
+        return (int) pow(2, $retries - 1);
+    }
+
+    /**
+     * @param RequestInterface $request
+     * @param array            $options
+     *
+     * @return PromiseInterface
+     */
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        if (!isset($options['retries'])) {
+            $options['retries'] = 0;
+        }
+
+        $fn = $this->nextHandler;
+        return $fn($request, $options)
+            ->then(
+                $this->onFulfilled($request, $options),
+                $this->onRejected($request, $options)
+            );
+    }
+
+    private function onFulfilled(RequestInterface $req, array $options)
+    {
+        return function ($value) use ($req, $options) {
+            if (!call_user_func(
+                $this->decider,
+                $options['retries'],
+                $req,
+                $value,
+                null
+            )) {
+                return $value;
+            }
+            return $this->doRetry($req, $options, $value);
+        };
+    }
+
+    private function onRejected(RequestInterface $req, array $options)
+    {
+        return function ($reason) use ($req, $options) {
+            if (!call_user_func(
+                $this->decider,
+                $options['retries'],
+                $req,
+                null,
+                $reason
+            )) {
+                return \GuzzleHttp\Promise\rejection_for($reason);
+            }
+            return $this->doRetry($req, $options);
+        };
+    }
+
+    private function doRetry(RequestInterface $request, array $options, ResponseInterface $response = null)
+    {
+        $options['delay'] = call_user_func($this->delay, ++$options['retries'], $response);
+
+        return $this($request, $options);
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/TransferStats.php

@@ -0,0 +1,126 @@
+<?php
+namespace GuzzleHttp;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Represents data at the point after it was transferred either successfully
+ * or after a network error.
+ */
+final class TransferStats
+{
+    private $request;
+    private $response;
+    private $transferTime;
+    private $handlerStats;
+    private $handlerErrorData;
+
+    /**
+     * @param RequestInterface  $request          Request that was sent.
+     * @param ResponseInterface $response         Response received (if any)
+     * @param float|null        $transferTime     Total handler transfer time.
+     * @param mixed             $handlerErrorData Handler error data.
+     * @param array             $handlerStats     Handler specific stats.
+     */
+    public function __construct(
+        RequestInterface $request,
+        ResponseInterface $response = null,
+        $transferTime = null,
+        $handlerErrorData = null,
+        $handlerStats = []
+    ) {
+        $this->request = $request;
+        $this->response = $response;
+        $this->transferTime = $transferTime;
+        $this->handlerErrorData = $handlerErrorData;
+        $this->handlerStats = $handlerStats;
+    }
+
+    /**
+     * @return RequestInterface
+     */
+    public function getRequest()
+    {
+        return $this->request;
+    }
+
+    /**
+     * Returns the response that was received (if any).
+     *
+     * @return ResponseInterface|null
+     */
+    public function getResponse()
+    {
+        return $this->response;
+    }
+
+    /**
+     * Returns true if a response was received.
+     *
+     * @return bool
+     */
+    public function hasResponse()
+    {
+        return $this->response !== null;
+    }
+
+    /**
+     * Gets handler specific error data.
+     *
+     * This might be an exception, a integer representing an error code, or
+     * anything else. Relying on this value assumes that you know what handler
+     * you are using.
+     *
+     * @return mixed
+     */
+    public function getHandlerErrorData()
+    {
+        return $this->handlerErrorData;
+    }
+
+    /**
+     * Get the effective URI the request was sent to.
+     *
+     * @return UriInterface
+     */
+    public function getEffectiveUri()
+    {
+        return $this->request->getUri();
+    }
+
+    /**
+     * Get the estimated time the request was being transferred by the handler.
+     *
+     * @return float Time in seconds.
+     */
+    public function getTransferTime()
+    {
+        return $this->transferTime;
+    }
+
+    /**
+     * Gets an array of all of the handler specific transfer data.
+     *
+     * @return array
+     */
+    public function getHandlerStats()
+    {
+        return $this->handlerStats;
+    }
+
+    /**
+     * Get a specific handler statistic from the handler by name.
+     *
+     * @param string $stat Handler specific transfer stat to retrieve.
+     *
+     * @return mixed|null
+     */
+    public function getHandlerStat($stat)
+    {
+        return isset($this->handlerStats[$stat])
+            ? $this->handlerStats[$stat]
+            : null;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/UriTemplate.php

@@ -0,0 +1,237 @@
+<?php
+namespace GuzzleHttp;
+
+/**
+ * Expands URI templates. Userland implementation of PECL uri_template.
+ *
+ * @link http://tools.ietf.org/html/rfc6570
+ */
+class UriTemplate
+{
+    /** @var string URI template */
+    private $template;
+
+    /** @var array Variables to use in the template expansion */
+    private $variables;
+
+    /** @var array Hash for quick operator lookups */
+    private static $operatorHash = [
+        ''  => ['prefix' => '',  'joiner' => ',', 'query' => false],
+        '+' => ['prefix' => '',  'joiner' => ',', 'query' => false],
+        '#' => ['prefix' => '#', 'joiner' => ',', 'query' => false],
+        '.' => ['prefix' => '.', 'joiner' => '.', 'query' => false],
+        '/' => ['prefix' => '/', 'joiner' => '/', 'query' => false],
+        ';' => ['prefix' => ';', 'joiner' => ';', 'query' => true],
+        '?' => ['prefix' => '?', 'joiner' => '&', 'query' => true],
+        '&' => ['prefix' => '&', 'joiner' => '&', 'query' => true]
+    ];
+
+    /** @var array Delimiters */
+    private static $delims = [':', '/', '?', '#', '[', ']', '@', '!', '$',
+        '&', '\'', '(', ')', '*', '+', ',', ';', '='];
+
+    /** @var array Percent encoded delimiters */
+    private static $delimsPct = ['%3A', '%2F', '%3F', '%23', '%5B', '%5D',
+        '%40', '%21', '%24', '%26', '%27', '%28', '%29', '%2A', '%2B', '%2C',
+        '%3B', '%3D'];
+
+    public function expand($template, array $variables)
+    {
+        if (false === strpos($template, '{')) {
+            return $template;
+        }
+
+        $this->template = $template;
+        $this->variables = $variables;
+
+        return preg_replace_callback(
+            '/\{([^\}]+)\}/',
+            [$this, 'expandMatch'],
+            $this->template
+        );
+    }
+
+    /**
+     * Parse an expression into parts
+     *
+     * @param string $expression Expression to parse
+     *
+     * @return array Returns an associative array of parts
+     */
+    private function parseExpression($expression)
+    {
+        $result = [];
+
+        if (isset(self::$operatorHash[$expression[0]])) {
+            $result['operator'] = $expression[0];
+            $expression = substr($expression, 1);
+        } else {
+            $result['operator'] = '';
+        }
+
+        foreach (explode(',', $expression) as $value) {
+            $value = trim($value);
+            $varspec = [];
+            if ($colonPos = strpos($value, ':')) {
+                $varspec['value'] = substr($value, 0, $colonPos);
+                $varspec['modifier'] = ':';
+                $varspec['position'] = (int) substr($value, $colonPos + 1);
+            } elseif (substr($value, -1) === '*') {
+                $varspec['modifier'] = '*';
+                $varspec['value'] = substr($value, 0, -1);
+            } else {
+                $varspec['value'] = (string) $value;
+                $varspec['modifier'] = '';
+            }
+            $result['values'][] = $varspec;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Process an expansion
+     *
+     * @param array $matches Matches met in the preg_replace_callback
+     *
+     * @return string Returns the replacement string
+     */
+    private function expandMatch(array $matches)
+    {
+        static $rfc1738to3986 = ['+' => '%20', '%7e' => '~'];
+
+        $replacements = [];
+        $parsed = self::parseExpression($matches[1]);
+        $prefix = self::$operatorHash[$parsed['operator']]['prefix'];
+        $joiner = self::$operatorHash[$parsed['operator']]['joiner'];
+        $useQuery = self::$operatorHash[$parsed['operator']]['query'];
+
+        foreach ($parsed['values'] as $value) {
+            if (!isset($this->variables[$value['value']])) {
+                continue;
+            }
+
+            $variable = $this->variables[$value['value']];
+            $actuallyUseQuery = $useQuery;
+            $expanded = '';
+
+            if (is_array($variable)) {
+                $isAssoc = $this->isAssoc($variable);
+                $kvp = [];
+                foreach ($variable as $key => $var) {
+                    if ($isAssoc) {
+                        $key = rawurlencode($key);
+                        $isNestedArray = is_array($var);
+                    } else {
+                        $isNestedArray = false;
+                    }
+
+                    if (!$isNestedArray) {
+                        $var = rawurlencode($var);
+                        if ($parsed['operator'] === '+' ||
+                            $parsed['operator'] === '#'
+                        ) {
+                            $var = $this->decodeReserved($var);
+                        }
+                    }
+
+                    if ($value['modifier'] === '*') {
+                        if ($isAssoc) {
+                            if ($isNestedArray) {
+                                // Nested arrays must allow for deeply nested
+                                // structures.
+                                $var = strtr(
+                                    http_build_query([$key => $var]),
+                                    $rfc1738to3986
+                                );
+                            } else {
+                                $var = $key . '=' . $var;
+                            }
+                        } elseif ($key > 0 && $actuallyUseQuery) {
+                            $var = $value['value'] . '=' . $var;
+                        }
+                    }
+
+                    $kvp[$key] = $var;
+                }
+
+                if (empty($variable)) {
+                    $actuallyUseQuery = false;
+                } elseif ($value['modifier'] === '*') {
+                    $expanded = implode($joiner, $kvp);
+                    if ($isAssoc) {
+                        // Don't prepend the value name when using the explode
+                        // modifier with an associative array.
+                        $actuallyUseQuery = false;
+                    }
+                } else {
+                    if ($isAssoc) {
+                        // When an associative array is encountered and the
+                        // explode modifier is not set, then the result must be
+                        // a comma separated list of keys followed by their
+                        // respective values.
+                        foreach ($kvp as $k => &$v) {
+                            $v = $k . ',' . $v;
+                        }
+                    }
+                    $expanded = implode(',', $kvp);
+                }
+            } else {
+                if ($value['modifier'] === ':') {
+                    $variable = substr($variable, 0, $value['position']);
+                }
+                $expanded = rawurlencode($variable);
+                if ($parsed['operator'] === '+' || $parsed['operator'] === '#') {
+                    $expanded = $this->decodeReserved($expanded);
+                }
+            }
+
+            if ($actuallyUseQuery) {
+                if (!$expanded && $joiner !== '&') {
+                    $expanded = $value['value'];
+                } else {
+                    $expanded = $value['value'] . '=' . $expanded;
+                }
+            }
+
+            $replacements[] = $expanded;
+        }
+
+        $ret = implode($joiner, $replacements);
+        if ($ret && $prefix) {
+            return $prefix . $ret;
+        }
+
+        return $ret;
+    }
+
+    /**
+     * Determines if an array is associative.
+     *
+     * This makes the assumption that input arrays are sequences or hashes.
+     * This assumption is a tradeoff for accuracy in favor of speed, but it
+     * should work in almost every case where input is supplied for a URI
+     * template.
+     *
+     * @param array $array Array to check
+     *
+     * @return bool
+     */
+    private function isAssoc(array $array)
+    {
+        return $array && array_keys($array)[0] !== 0;
+    }
+
+    /**
+     * Removes percent encoding on reserved characters (used with + and #
+     * modifiers).
+     *
+     * @param string $string String to fix
+     *
+     * @return string
+     */
+    private function decodeReserved($string)
+    {
+        return str_replace(self::$delimsPct, self::$delims, $string);
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/functions.php

@@ -0,0 +1,346 @@
+<?php
+namespace GuzzleHttp;
+
+use GuzzleHttp\Handler\CurlHandler;
+use GuzzleHttp\Handler\CurlMultiHandler;
+use GuzzleHttp\Handler\Proxy;
+use GuzzleHttp\Handler\StreamHandler;
+
+/**
+ * Expands a URI template
+ *
+ * @param string $template  URI template
+ * @param array  $variables Template variables
+ *
+ * @return string
+ */
+function uri_template($template, array $variables)
+{
+    if (extension_loaded('uri_template')) {
+        // @codeCoverageIgnoreStart
+        return \uri_template($template, $variables);
+        // @codeCoverageIgnoreEnd
+    }
+
+    static $uriTemplate;
+    if (!$uriTemplate) {
+        $uriTemplate = new UriTemplate();
+    }
+
+    return $uriTemplate->expand($template, $variables);
+}
+
+/**
+ * Debug function used to describe the provided value type and class.
+ *
+ * @param mixed $input
+ *
+ * @return string Returns a string containing the type of the variable and
+ *                if a class is provided, the class name.
+ */
+function describe_type($input)
+{
+    switch (gettype($input)) {
+        case 'object':
+            return 'object(' . get_class($input) . ')';
+        case 'array':
+            return 'array(' . count($input) . ')';
+        default:
+            ob_start();
+            var_dump($input);
+            // normalize float vs double
+            return str_replace('double(', 'float(', rtrim(ob_get_clean()));
+    }
+}
+
+/**
+ * Parses an array of header lines into an associative array of headers.
+ *
+ * @param array $lines Header lines array of strings in the following
+ *                     format: "Name: Value"
+ * @return array
+ */
+function headers_from_lines($lines)
+{
+    $headers = [];
+
+    foreach ($lines as $line) {
+        $parts = explode(':', $line, 2);
+        $headers[trim($parts[0])][] = isset($parts[1])
+            ? trim($parts[1])
+            : null;
+    }
+
+    return $headers;
+}
+
+/**
+ * Returns a debug stream based on the provided variable.
+ *
+ * @param mixed $value Optional value
+ *
+ * @return resource
+ */
+function debug_resource($value = null)
+{
+    if (is_resource($value)) {
+        return $value;
+    } elseif (defined('STDOUT')) {
+        return STDOUT;
+    }
+
+    return fopen('php://output', 'w');
+}
+
+/**
+ * Chooses and creates a default handler to use based on the environment.
+ *
+ * The returned handler is not wrapped by any default middlewares.
+ *
+ * @throws \RuntimeException if no viable Handler is available.
+ * @return callable Returns the best handler for the given system.
+ */
+function choose_handler()
+{
+    $handler = null;
+    if (function_exists('curl_multi_exec') && function_exists('curl_exec')) {
+        $handler = Proxy::wrapSync(new CurlMultiHandler(), new CurlHandler());
+    } elseif (function_exists('curl_exec')) {
+        $handler = new CurlHandler();
+    } elseif (function_exists('curl_multi_exec')) {
+        $handler = new CurlMultiHandler();
+    }
+
+    if (ini_get('allow_url_fopen')) {
+        $handler = $handler
+            ? Proxy::wrapStreaming($handler, new StreamHandler())
+            : new StreamHandler();
+    } elseif (!$handler) {
+        throw new \RuntimeException('GuzzleHttp requires cURL, the '
+            . 'allow_url_fopen ini setting, or a custom HTTP handler.');
+    }
+
+    return $handler;
+}
+
+/**
+ * Get the default User-Agent string to use with Guzzle
+ *
+ * @return string
+ */
+function default_user_agent()
+{
+    static $defaultAgent = '';
+
+    if (!$defaultAgent) {
+        $defaultAgent = 'GuzzleHttp/' . Client::VERSION;
+        if (extension_loaded('curl') && function_exists('curl_version')) {
+            $defaultAgent .= ' curl/' . \curl_version()['version'];
+        }
+        $defaultAgent .= ' PHP/' . PHP_VERSION;
+    }
+
+    return $defaultAgent;
+}
+
+/**
+ * Returns the default cacert bundle for the current system.
+ *
+ * First, the openssl.cafile and curl.cainfo php.ini settings are checked.
+ * If those settings are not configured, then the common locations for
+ * bundles found on Red Hat, CentOS, Fedora, Ubuntu, Debian, FreeBSD, OS X
+ * and Windows are checked. If any of these file locations are found on
+ * disk, they will be utilized.
+ *
+ * Note: the result of this function is cached for subsequent calls.
+ *
+ * @return string
+ * @throws \RuntimeException if no bundle can be found.
+ */
+function default_ca_bundle()
+{
+    static $cached = null;
+    static $cafiles = [
+        // Red Hat, CentOS, Fedora (provided by the ca-certificates package)
+        '/etc/pki/tls/certs/ca-bundle.crt',
+        // Ubuntu, Debian (provided by the ca-certificates package)
+        '/etc/ssl/certs/ca-certificates.crt',
+        // FreeBSD (provided by the ca_root_nss package)
+        '/usr/local/share/certs/ca-root-nss.crt',
+        // SLES 12 (provided by the ca-certificates package)
+        '/var/lib/ca-certificates/ca-bundle.pem',
+        // OS X provided by homebrew (using the default path)
+        '/usr/local/etc/openssl/cert.pem',
+        // Google app engine
+        '/etc/ca-certificates.crt',
+        // Windows?
+        'C:\\windows\\system32\\curl-ca-bundle.crt',
+        'C:\\windows\\curl-ca-bundle.crt',
+    ];
+
+    if ($cached) {
+        return $cached;
+    }
+
+    if ($ca = ini_get('openssl.cafile')) {
+        return $cached = $ca;
+    }
+
+    if ($ca = ini_get('curl.cainfo')) {
+        return $cached = $ca;
+    }
+
+    foreach ($cafiles as $filename) {
+        if (file_exists($filename)) {
+            return $cached = $filename;
+        }
+    }
+
+    throw new \RuntimeException(
+        <<< EOT
+No system CA bundle could be found in any of the the common system locations.
+PHP versions earlier than 5.6 are not properly configured to use the system's
+CA bundle by default. In order to verify peer certificates, you will need to
+supply the path on disk to a certificate bundle to the 'verify' request
+option: http://docs.guzzlephp.org/en/latest/clients.html#verify. If you do not
+need a specific certificate bundle, then Mozilla provides a commonly used CA
+bundle which can be downloaded here (provided by the maintainer of cURL):
+https://raw.githubusercontent.com/bagder/ca-bundle/master/ca-bundle.crt. Once
+you have a CA bundle available on disk, you can set the 'openssl.cafile' PHP
+ini setting to point to the path to the file, allowing you to omit the 'verify'
+request option. See http://curl.haxx.se/docs/sslcerts.html for more
+information.
+EOT
+    );
+}
+
+/**
+ * Creates an associative array of lowercase header names to the actual
+ * header casing.
+ *
+ * @param array $headers
+ *
+ * @return array
+ */
+function normalize_header_keys(array $headers)
+{
+    $result = [];
+    foreach (array_keys($headers) as $key) {
+        $result[strtolower($key)] = $key;
+    }
+
+    return $result;
+}
+
+/**
+ * Returns true if the provided host matches any of the no proxy areas.
+ *
+ * This method will strip a port from the host if it is present. Each pattern
+ * can be matched with an exact match (e.g., "foo.com" == "foo.com") or a
+ * partial match: (e.g., "foo.com" == "baz.foo.com" and ".foo.com" ==
+ * "baz.foo.com", but ".foo.com" != "foo.com").
+ *
+ * Areas are matched in the following cases:
+ * 1. "*" (without quotes) always matches any hosts.
+ * 2. An exact match.
+ * 3. The area starts with "." and the area is the last part of the host. e.g.
+ *    '.mit.edu' will match any host that ends with '.mit.edu'.
+ *
+ * @param string $host         Host to check against the patterns.
+ * @param array  $noProxyArray An array of host patterns.
+ *
+ * @return bool
+ */
+function is_host_in_noproxy($host, array $noProxyArray)
+{
+    if (strlen($host) === 0) {
+        throw new \InvalidArgumentException('Empty host provided');
+    }
+
+    // Strip port if present.
+    if (strpos($host, ':')) {
+        $host = explode($host, ':', 2)[0];
+    }
+
+    foreach ($noProxyArray as $area) {
+        // Always match on wildcards.
+        if ($area === '*') {
+            return true;
+        } elseif (empty($area)) {
+            // Don't match on empty values.
+            continue;
+        } elseif ($area === $host) {
+            // Exact matches.
+            return true;
+        } else {
+            // Special match if the area when prefixed with ".". Remove any
+            // existing leading "." and add a new leading ".".
+            $area = '.' . ltrim($area, '.');
+            if (substr($host, -(strlen($area))) === $area) {
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
+/**
+ * Wrapper for json_decode that throws when an error occurs.
+ *
+ * @param string $json    JSON data to parse
+ * @param bool $assoc     When true, returned objects will be converted
+ *                        into associative arrays.
+ * @param int    $depth   User specified recursion depth.
+ * @param int    $options Bitmask of JSON decode options.
+ *
+ * @return mixed
+ * @throws Exception\InvalidArgumentException if the JSON cannot be decoded.
+ * @link http://www.php.net/manual/en/function.json-decode.php
+ */
+function json_decode($json, $assoc = false, $depth = 512, $options = 0)
+{
+    $data = \json_decode($json, $assoc, $depth, $options);
+    if (JSON_ERROR_NONE !== json_last_error()) {
+        throw new Exception\InvalidArgumentException(
+            'json_decode error: ' . json_last_error_msg()
+        );
+    }
+
+    return $data;
+}
+
+/**
+ * Wrapper for JSON encoding that throws when an error occurs.
+ *
+ * @param mixed $value   The value being encoded
+ * @param int    $options JSON encode option bitmask
+ * @param int    $depth   Set the maximum depth. Must be greater than zero.
+ *
+ * @return string
+ * @throws Exception\InvalidArgumentException if the JSON cannot be encoded.
+ * @link http://www.php.net/manual/en/function.json-encode.php
+ */
+function json_encode($value, $options = 0, $depth = 512)
+{
+    $json = \json_encode($value, $options, $depth);
+    if (JSON_ERROR_NONE !== json_last_error()) {
+        throw new Exception\InvalidArgumentException(
+            'json_encode error: ' . json_last_error_msg()
+        );
+    }
+
+    return $json;
+}
+
+/**
+ * Wrapper for the hrtime() or microtime() functions
+ * (depending on the PHP version, one of the two is used)
+ *
+ * @return float|mixed UNIX timestamp
+ * @internal
+ */
+function _current_time()
+{
+    return function_exists('hrtime') ? hrtime(true) / 1e9 : microtime(true);
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/guzzle/src/functions_include.php

@@ -0,0 +1,6 @@
+<?php
+
+// Don't redefine the functions if included multiple times.
+if (!function_exists('GuzzleHttp\uri_template')) {
+    require __DIR__ . '/functions.php';
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2015-2016 Michael Dowling, https://github.com/mtdowling <mtdowling@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/AggregateException.php

@@ -0,0 +1,16 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * Exception thrown when too many errors occur in the some() or any() methods.
+ */
+class AggregateException extends RejectionException
+{
+    public function __construct($msg, array $reasons)
+    {
+        parent::__construct(
+            $reasons,
+            sprintf('%s; %d rejected promises', $msg, count($reasons))
+        );
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/CancellationException.php

@@ -0,0 +1,9 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * Exception that is set as the reason for a promise that has been cancelled.
+ */
+class CancellationException extends RejectionException
+{
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/Coroutine.php

@@ -0,0 +1,151 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+use Exception;
+use Generator;
+use Throwable;
+
+/**
+ * Creates a promise that is resolved using a generator that yields values or
+ * promises (somewhat similar to C#'s async keyword).
+ *
+ * When called, the coroutine function will start an instance of the generator
+ * and returns a promise that is fulfilled with its final yielded value.
+ *
+ * Control is returned back to the generator when the yielded promise settles.
+ * This can lead to less verbose code when doing lots of sequential async calls
+ * with minimal processing in between.
+ *
+ *     use GuzzleHttp\Promise;
+ *
+ *     function createPromise($value) {
+ *         return new Promise\FulfilledPromise($value);
+ *     }
+ *
+ *     $promise = Promise\coroutine(function () {
+ *         $value = (yield createPromise('a'));
+ *         try {
+ *             $value = (yield createPromise($value . 'b'));
+ *         } catch (\Exception $e) {
+ *             // The promise was rejected.
+ *         }
+ *         yield $value . 'c';
+ *     });
+ *
+ *     // Outputs "abc"
+ *     $promise->then(function ($v) { echo $v; });
+ *
+ * @param callable $generatorFn Generator function to wrap into a promise.
+ *
+ * @return Promise
+ * @link https://github.com/petkaantonov/bluebird/blob/master/API.md#generators inspiration
+ */
+final class Coroutine implements PromiseInterface
+{
+    /**
+     * @var PromiseInterface|null
+     */
+    private $currentPromise;
+
+    /**
+     * @var Generator
+     */
+    private $generator;
+
+    /**
+     * @var Promise
+     */
+    private $result;
+
+    public function __construct(callable $generatorFn)
+    {
+        $this->generator = $generatorFn();
+        $this->result = new Promise(function () {
+            while (isset($this->currentPromise)) {
+                $this->currentPromise->wait();
+            }
+        });
+        $this->nextCoroutine($this->generator->current());
+    }
+
+    public function then(
+        callable $onFulfilled = null,
+        callable $onRejected = null
+    ) {
+        return $this->result->then($onFulfilled, $onRejected);
+    }
+
+    public function otherwise(callable $onRejected)
+    {
+        return $this->result->otherwise($onRejected);
+    }
+
+    public function wait($unwrap = true)
+    {
+        return $this->result->wait($unwrap);
+    }
+
+    public function getState()
+    {
+        return $this->result->getState();
+    }
+
+    public function resolve($value)
+    {
+        $this->result->resolve($value);
+    }
+
+    public function reject($reason)
+    {
+        $this->result->reject($reason);
+    }
+
+    public function cancel()
+    {
+        $this->currentPromise->cancel();
+        $this->result->cancel();
+    }
+
+    private function nextCoroutine($yielded)
+    {
+        $this->currentPromise = promise_for($yielded)
+            ->then([$this, '_handleSuccess'], [$this, '_handleFailure']);
+    }
+
+    /**
+     * @internal
+     */
+    public function _handleSuccess($value)
+    {
+        unset($this->currentPromise);
+        try {
+            $next = $this->generator->send($value);
+            if ($this->generator->valid()) {
+                $this->nextCoroutine($next);
+            } else {
+                $this->result->resolve($value);
+            }
+        } catch (Exception $exception) {
+            $this->result->reject($exception);
+        } catch (Throwable $throwable) {
+            $this->result->reject($throwable);
+        }
+    }
+
+    /**
+     * @internal
+     */
+    public function _handleFailure($reason)
+    {
+        unset($this->currentPromise);
+        try {
+            $nextYield = $this->generator->throw(exception_for($reason));
+            // The throw was caught, so keep iterating on the coroutine
+            $this->nextCoroutine($nextYield);
+        } catch (Exception $exception) {
+            $this->result->reject($exception);
+        } catch (Throwable $throwable) {
+            $this->result->reject($throwable);
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/EachPromise.php

@@ -0,0 +1,229 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * Represents a promise that iterates over many promises and invokes
+ * side-effect functions in the process.
+ */
+class EachPromise implements PromisorInterface
+{
+    private $pending = [];
+
+    /** @var \Iterator */
+    private $iterable;
+
+    /** @var callable|int */
+    private $concurrency;
+
+    /** @var callable */
+    private $onFulfilled;
+
+    /** @var callable */
+    private $onRejected;
+
+    /** @var Promise */
+    private $aggregate;
+
+    /** @var bool */
+    private $mutex;
+
+    /**
+     * Configuration hash can include the following key value pairs:
+     *
+     * - fulfilled: (callable) Invoked when a promise fulfills. The function
+     *   is invoked with three arguments: the fulfillment value, the index
+     *   position from the iterable list of the promise, and the aggregate
+     *   promise that manages all of the promises. The aggregate promise may
+     *   be resolved from within the callback to short-circuit the promise.
+     * - rejected: (callable) Invoked when a promise is rejected. The
+     *   function is invoked with three arguments: the rejection reason, the
+     *   index position from the iterable list of the promise, and the
+     *   aggregate promise that manages all of the promises. The aggregate
+     *   promise may be resolved from within the callback to short-circuit
+     *   the promise.
+     * - concurrency: (integer) Pass this configuration option to limit the
+     *   allowed number of outstanding concurrently executing promises,
+     *   creating a capped pool of promises. There is no limit by default.
+     *
+     * @param mixed    $iterable Promises or values to iterate.
+     * @param array    $config   Configuration options
+     */
+    public function __construct($iterable, array $config = [])
+    {
+        $this->iterable = iter_for($iterable);
+
+        if (isset($config['concurrency'])) {
+            $this->concurrency = $config['concurrency'];
+        }
+
+        if (isset($config['fulfilled'])) {
+            $this->onFulfilled = $config['fulfilled'];
+        }
+
+        if (isset($config['rejected'])) {
+            $this->onRejected = $config['rejected'];
+        }
+    }
+
+    public function promise()
+    {
+        if ($this->aggregate) {
+            return $this->aggregate;
+        }
+
+        try {
+            $this->createPromise();
+            $this->iterable->rewind();
+            $this->refillPending();
+        } catch (\Throwable $e) {
+            $this->aggregate->reject($e);
+        } catch (\Exception $e) {
+            $this->aggregate->reject($e);
+        }
+
+        return $this->aggregate;
+    }
+
+    private function createPromise()
+    {
+        $this->mutex = false;
+        $this->aggregate = new Promise(function () {
+            reset($this->pending);
+            if (empty($this->pending) && !$this->iterable->valid()) {
+                $this->aggregate->resolve(null);
+                return;
+            }
+
+            // Consume a potentially fluctuating list of promises while
+            // ensuring that indexes are maintained (precluding array_shift).
+            while ($promise = current($this->pending)) {
+                next($this->pending);
+                $promise->wait();
+                if ($this->aggregate->getState() !== PromiseInterface::PENDING) {
+                    return;
+                }
+            }
+        });
+
+        // Clear the references when the promise is resolved.
+        $clearFn = function () {
+            $this->iterable = $this->concurrency = $this->pending = null;
+            $this->onFulfilled = $this->onRejected = null;
+        };
+
+        $this->aggregate->then($clearFn, $clearFn);
+    }
+
+    private function refillPending()
+    {
+        if (!$this->concurrency) {
+            // Add all pending promises.
+            while ($this->addPending() && $this->advanceIterator());
+            return;
+        }
+
+        // Add only up to N pending promises.
+        $concurrency = is_callable($this->concurrency)
+            ? call_user_func($this->concurrency, count($this->pending))
+            : $this->concurrency;
+        $concurrency = max($concurrency - count($this->pending), 0);
+        // Concurrency may be set to 0 to disallow new promises.
+        if (!$concurrency) {
+            return;
+        }
+        // Add the first pending promise.
+        $this->addPending();
+        // Note this is special handling for concurrency=1 so that we do
+        // not advance the iterator after adding the first promise. This
+        // helps work around issues with generators that might not have the
+        // next value to yield until promise callbacks are called.
+        while (--$concurrency
+            && $this->advanceIterator()
+            && $this->addPending());
+    }
+
+    private function addPending()
+    {
+        if (!$this->iterable || !$this->iterable->valid()) {
+            return false;
+        }
+
+        $promise = promise_for($this->iterable->current());
+        $idx = $this->iterable->key();
+
+        $this->pending[$idx] = $promise->then(
+            function ($value) use ($idx) {
+                if ($this->onFulfilled) {
+                    call_user_func(
+                        $this->onFulfilled, $value, $idx, $this->aggregate
+                    );
+                }
+                $this->step($idx);
+            },
+            function ($reason) use ($idx) {
+                if ($this->onRejected) {
+                    call_user_func(
+                        $this->onRejected, $reason, $idx, $this->aggregate
+                    );
+                }
+                $this->step($idx);
+            }
+        );
+
+        return true;
+    }
+
+    private function advanceIterator()
+    {
+        // Place a lock on the iterator so that we ensure to not recurse,
+        // preventing fatal generator errors.
+        if ($this->mutex) {
+            return false;
+        }
+
+        $this->mutex = true;
+
+        try {
+            $this->iterable->next();
+            $this->mutex = false;
+            return true;
+        } catch (\Throwable $e) {
+            $this->aggregate->reject($e);
+            $this->mutex = false;
+            return false;
+        } catch (\Exception $e) {
+            $this->aggregate->reject($e);
+            $this->mutex = false;
+            return false;
+        }
+    }
+
+    private function step($idx)
+    {
+        // If the promise was already resolved, then ignore this step.
+        if ($this->aggregate->getState() !== PromiseInterface::PENDING) {
+            return;
+        }
+
+        unset($this->pending[$idx]);
+
+        // Only refill pending promises if we are not locked, preventing the
+        // EachPromise to recursively invoke the provided iterator, which
+        // cause a fatal error: "Cannot resume an already running generator"
+        if ($this->advanceIterator() && !$this->checkIfFinished()) {
+            // Add more pending promises if possible.
+            $this->refillPending();
+        }
+    }
+
+    private function checkIfFinished()
+    {
+        if (!$this->pending && !$this->iterable->valid()) {
+            // Resolve the promise if there's nothing left to do.
+            $this->aggregate->resolve(null);
+            return true;
+        }
+
+        return false;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/FulfilledPromise.php

@@ -0,0 +1,82 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * A promise that has been fulfilled.
+ *
+ * Thenning off of this promise will invoke the onFulfilled callback
+ * immediately and ignore other callbacks.
+ */
+class FulfilledPromise implements PromiseInterface
+{
+    private $value;
+
+    public function __construct($value)
+    {
+        if (method_exists($value, 'then')) {
+            throw new \InvalidArgumentException(
+                'You cannot create a FulfilledPromise with a promise.');
+        }
+
+        $this->value = $value;
+    }
+
+    public function then(
+        callable $onFulfilled = null,
+        callable $onRejected = null
+    ) {
+        // Return itself if there is no onFulfilled function.
+        if (!$onFulfilled) {
+            return $this;
+        }
+
+        $queue = queue();
+        $p = new Promise([$queue, 'run']);
+        $value = $this->value;
+        $queue->add(static function () use ($p, $value, $onFulfilled) {
+            if ($p->getState() === self::PENDING) {
+                try {
+                    $p->resolve($onFulfilled($value));
+                } catch (\Throwable $e) {
+                    $p->reject($e);
+                } catch (\Exception $e) {
+                    $p->reject($e);
+                }
+            }
+        });
+
+        return $p;
+    }
+
+    public function otherwise(callable $onRejected)
+    {
+        return $this->then(null, $onRejected);
+    }
+
+    public function wait($unwrap = true, $defaultDelivery = null)
+    {
+        return $unwrap ? $this->value : null;
+    }
+
+    public function getState()
+    {
+        return self::FULFILLED;
+    }
+
+    public function resolve($value)
+    {
+        if ($value !== $this->value) {
+            throw new \LogicException("Cannot resolve a fulfilled promise");
+        }
+    }
+
+    public function reject($reason)
+    {
+        throw new \LogicException("Cannot reject a fulfilled promise");
+    }
+
+    public function cancel()
+    {
+        // pass
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/Promise.php

@@ -0,0 +1,280 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * Promises/A+ implementation that avoids recursion when possible.
+ *
+ * @link https://promisesaplus.com/
+ */
+class Promise implements PromiseInterface
+{
+    private $state = self::PENDING;
+    private $result;
+    private $cancelFn;
+    private $waitFn;
+    private $waitList;
+    private $handlers = [];
+
+    /**
+     * @param callable $waitFn   Fn that when invoked resolves the promise.
+     * @param callable $cancelFn Fn that when invoked cancels the promise.
+     */
+    public function __construct(
+        callable $waitFn = null,
+        callable $cancelFn = null
+    ) {
+        $this->waitFn = $waitFn;
+        $this->cancelFn = $cancelFn;
+    }
+
+    public function then(
+        callable $onFulfilled = null,
+        callable $onRejected = null
+    ) {
+        if ($this->state === self::PENDING) {
+            $p = new Promise(null, [$this, 'cancel']);
+            $this->handlers[] = [$p, $onFulfilled, $onRejected];
+            $p->waitList = $this->waitList;
+            $p->waitList[] = $this;
+            return $p;
+        }
+
+        // Return a fulfilled promise and immediately invoke any callbacks.
+        if ($this->state === self::FULFILLED) {
+            return $onFulfilled
+                ? promise_for($this->result)->then($onFulfilled)
+                : promise_for($this->result);
+        }
+
+        // It's either cancelled or rejected, so return a rejected promise
+        // and immediately invoke any callbacks.
+        $rejection = rejection_for($this->result);
+        return $onRejected ? $rejection->then(null, $onRejected) : $rejection;
+    }
+
+    public function otherwise(callable $onRejected)
+    {
+        return $this->then(null, $onRejected);
+    }
+
+    public function wait($unwrap = true)
+    {
+        $this->waitIfPending();
+
+        $inner = $this->result instanceof PromiseInterface
+            ? $this->result->wait($unwrap)
+            : $this->result;
+
+        if ($unwrap) {
+            if ($this->result instanceof PromiseInterface
+                || $this->state === self::FULFILLED
+            ) {
+                return $inner;
+            } else {
+                // It's rejected so "unwrap" and throw an exception.
+                throw exception_for($inner);
+            }
+        }
+    }
+
+    public function getState()
+    {
+        return $this->state;
+    }
+
+    public function cancel()
+    {
+        if ($this->state !== self::PENDING) {
+            return;
+        }
+
+        $this->waitFn = $this->waitList = null;
+
+        if ($this->cancelFn) {
+            $fn = $this->cancelFn;
+            $this->cancelFn = null;
+            try {
+                $fn();
+            } catch (\Throwable $e) {
+                $this->reject($e);
+            } catch (\Exception $e) {
+                $this->reject($e);
+            }
+        }
+
+        // Reject the promise only if it wasn't rejected in a then callback.
+        if ($this->state === self::PENDING) {
+            $this->reject(new CancellationException('Promise has been cancelled'));
+        }
+    }
+
+    public function resolve($value)
+    {
+        $this->settle(self::FULFILLED, $value);
+    }
+
+    public function reject($reason)
+    {
+        $this->settle(self::REJECTED, $reason);
+    }
+
+    private function settle($state, $value)
+    {
+        if ($this->state !== self::PENDING) {
+            // Ignore calls with the same resolution.
+            if ($state === $this->state && $value === $this->result) {
+                return;
+            }
+            throw $this->state === $state
+                ? new \LogicException("The promise is already {$state}.")
+                : new \LogicException("Cannot change a {$this->state} promise to {$state}");
+        }
+
+        if ($value === $this) {
+            throw new \LogicException('Cannot fulfill or reject a promise with itself');
+        }
+
+        // Clear out the state of the promise but stash the handlers.
+        $this->state = $state;
+        $this->result = $value;
+        $handlers = $this->handlers;
+        $this->handlers = null;
+        $this->waitList = $this->waitFn = null;
+        $this->cancelFn = null;
+
+        if (!$handlers) {
+            return;
+        }
+
+        // If the value was not a settled promise or a thenable, then resolve
+        // it in the task queue using the correct ID.
+        if (!method_exists($value, 'then')) {
+            $id = $state === self::FULFILLED ? 1 : 2;
+            // It's a success, so resolve the handlers in the queue.
+            queue()->add(static function () use ($id, $value, $handlers) {
+                foreach ($handlers as $handler) {
+                    self::callHandler($id, $value, $handler);
+                }
+            });
+        } elseif ($value instanceof Promise
+            && $value->getState() === self::PENDING
+        ) {
+            // We can just merge our handlers onto the next promise.
+            $value->handlers = array_merge($value->handlers, $handlers);
+        } else {
+            // Resolve the handlers when the forwarded promise is resolved.
+            $value->then(
+                static function ($value) use ($handlers) {
+                    foreach ($handlers as $handler) {
+                        self::callHandler(1, $value, $handler);
+                    }
+                },
+                static function ($reason) use ($handlers) {
+                    foreach ($handlers as $handler) {
+                        self::callHandler(2, $reason, $handler);
+                    }
+                }
+            );
+        }
+    }
+
+    /**
+     * Call a stack of handlers using a specific callback index and value.
+     *
+     * @param int   $index   1 (resolve) or 2 (reject).
+     * @param mixed $value   Value to pass to the callback.
+     * @param array $handler Array of handler data (promise and callbacks).
+     *
+     * @return array Returns the next group to resolve.
+     */
+    private static function callHandler($index, $value, array $handler)
+    {
+        /** @var PromiseInterface $promise */
+        $promise = $handler[0];
+
+        // The promise may have been cancelled or resolved before placing
+        // this thunk in the queue.
+        if ($promise->getState() !== self::PENDING) {
+            return;
+        }
+
+        try {
+            if (isset($handler[$index])) {
+                $promise->resolve($handler[$index]($value));
+            } elseif ($index === 1) {
+                // Forward resolution values as-is.
+                $promise->resolve($value);
+            } else {
+                // Forward rejections down the chain.
+                $promise->reject($value);
+            }
+        } catch (\Throwable $reason) {
+            $promise->reject($reason);
+        } catch (\Exception $reason) {
+            $promise->reject($reason);
+        }
+    }
+
+    private function waitIfPending()
+    {
+        if ($this->state !== self::PENDING) {
+            return;
+        } elseif ($this->waitFn) {
+            $this->invokeWaitFn();
+        } elseif ($this->waitList) {
+            $this->invokeWaitList();
+        } else {
+            // If there's not wait function, then reject the promise.
+            $this->reject('Cannot wait on a promise that has '
+                . 'no internal wait function. You must provide a wait '
+                . 'function when constructing the promise to be able to '
+                . 'wait on a promise.');
+        }
+
+        queue()->run();
+
+        if ($this->state === self::PENDING) {
+            $this->reject('Invoking the wait callback did not resolve the promise');
+        }
+    }
+
+    private function invokeWaitFn()
+    {
+        try {
+            $wfn = $this->waitFn;
+            $this->waitFn = null;
+            $wfn(true);
+        } catch (\Exception $reason) {
+            if ($this->state === self::PENDING) {
+                // The promise has not been resolved yet, so reject the promise
+                // with the exception.
+                $this->reject($reason);
+            } else {
+                // The promise was already resolved, so there's a problem in
+                // the application.
+                throw $reason;
+            }
+        }
+    }
+
+    private function invokeWaitList()
+    {
+        $waitList = $this->waitList;
+        $this->waitList = null;
+
+        foreach ($waitList as $result) {
+            while (true) {
+                $result->waitIfPending();
+
+                if ($result->result instanceof Promise) {
+                    $result = $result->result;
+                } else {
+                    if ($result->result instanceof PromiseInterface) {
+                        $result->result->wait(false);
+                    }
+                    break;
+                }
+            }
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/PromiseInterface.php

@@ -0,0 +1,93 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * A promise represents the eventual result of an asynchronous operation.
+ *
+ * The primary way of interacting with a promise is through its then method,
+ * which registers callbacks to receive either a promise’s eventual value or
+ * the reason why the promise cannot be fulfilled.
+ *
+ * @link https://promisesaplus.com/
+ */
+interface PromiseInterface
+{
+    const PENDING = 'pending';
+    const FULFILLED = 'fulfilled';
+    const REJECTED = 'rejected';
+
+    /**
+     * Appends fulfillment and rejection handlers to the promise, and returns
+     * a new promise resolving to the return value of the called handler.
+     *
+     * @param callable $onFulfilled Invoked when the promise fulfills.
+     * @param callable $onRejected  Invoked when the promise is rejected.
+     *
+     * @return PromiseInterface
+     */
+    public function then(
+        callable $onFulfilled = null,
+        callable $onRejected = null
+    );
+
+    /**
+     * Appends a rejection handler callback to the promise, and returns a new
+     * promise resolving to the return value of the callback if it is called,
+     * or to its original fulfillment value if the promise is instead
+     * fulfilled.
+     *
+     * @param callable $onRejected Invoked when the promise is rejected.
+     *
+     * @return PromiseInterface
+     */
+    public function otherwise(callable $onRejected);
+
+    /**
+     * Get the state of the promise ("pending", "rejected", or "fulfilled").
+     *
+     * The three states can be checked against the constants defined on
+     * PromiseInterface: PENDING, FULFILLED, and REJECTED.
+     *
+     * @return string
+     */
+    public function getState();
+
+    /**
+     * Resolve the promise with the given value.
+     *
+     * @param mixed $value
+     * @throws \RuntimeException if the promise is already resolved.
+     */
+    public function resolve($value);
+
+    /**
+     * Reject the promise with the given reason.
+     *
+     * @param mixed $reason
+     * @throws \RuntimeException if the promise is already resolved.
+     */
+    public function reject($reason);
+
+    /**
+     * Cancels the promise if possible.
+     *
+     * @link https://github.com/promises-aplus/cancellation-spec/issues/7
+     */
+    public function cancel();
+
+    /**
+     * Waits until the promise completes if possible.
+     *
+     * Pass $unwrap as true to unwrap the result of the promise, either
+     * returning the resolved value or throwing the rejected exception.
+     *
+     * If the promise cannot be waited on, then the promise will be rejected.
+     *
+     * @param bool $unwrap
+     *
+     * @return mixed
+     * @throws \LogicException if the promise has no wait function or if the
+     *                         promise does not settle after waiting.
+     */
+    public function wait($unwrap = true);
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/PromisorInterface.php

@@ -0,0 +1,15 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * Interface used with classes that return a promise.
+ */
+interface PromisorInterface
+{
+    /**
+     * Returns a promise.
+     *
+     * @return PromiseInterface
+     */
+    public function promise();
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/RejectedPromise.php

@@ -0,0 +1,87 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * A promise that has been rejected.
+ *
+ * Thenning off of this promise will invoke the onRejected callback
+ * immediately and ignore other callbacks.
+ */
+class RejectedPromise implements PromiseInterface
+{
+    private $reason;
+
+    public function __construct($reason)
+    {
+        if (method_exists($reason, 'then')) {
+            throw new \InvalidArgumentException(
+                'You cannot create a RejectedPromise with a promise.');
+        }
+
+        $this->reason = $reason;
+    }
+
+    public function then(
+        callable $onFulfilled = null,
+        callable $onRejected = null
+    ) {
+        // If there's no onRejected callback then just return self.
+        if (!$onRejected) {
+            return $this;
+        }
+
+        $queue = queue();
+        $reason = $this->reason;
+        $p = new Promise([$queue, 'run']);
+        $queue->add(static function () use ($p, $reason, $onRejected) {
+            if ($p->getState() === self::PENDING) {
+                try {
+                    // Return a resolved promise if onRejected does not throw.
+                    $p->resolve($onRejected($reason));
+                } catch (\Throwable $e) {
+                    // onRejected threw, so return a rejected promise.
+                    $p->reject($e);
+                } catch (\Exception $e) {
+                    // onRejected threw, so return a rejected promise.
+                    $p->reject($e);
+                }
+            }
+        });
+
+        return $p;
+    }
+
+    public function otherwise(callable $onRejected)
+    {
+        return $this->then(null, $onRejected);
+    }
+
+    public function wait($unwrap = true, $defaultDelivery = null)
+    {
+        if ($unwrap) {
+            throw exception_for($this->reason);
+        }
+    }
+
+    public function getState()
+    {
+        return self::REJECTED;
+    }
+
+    public function resolve($value)
+    {
+        throw new \LogicException("Cannot resolve a rejected promise");
+    }
+
+    public function reject($reason)
+    {
+        if ($reason !== $this->reason) {
+            throw new \LogicException("Cannot reject a rejected promise");
+        }
+    }
+
+    public function cancel()
+    {
+        // pass
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/RejectionException.php

@@ -0,0 +1,47 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * A special exception that is thrown when waiting on a rejected promise.
+ *
+ * The reason value is available via the getReason() method.
+ */
+class RejectionException extends \RuntimeException
+{
+    /** @var mixed Rejection reason. */
+    private $reason;
+
+    /**
+     * @param mixed $reason       Rejection reason.
+     * @param string $description Optional description
+     */
+    public function __construct($reason, $description = null)
+    {
+        $this->reason = $reason;
+
+        $message = 'The promise was rejected';
+
+        if ($description) {
+            $message .= ' with reason: ' . $description;
+        } elseif (is_string($reason)
+            || (is_object($reason) && method_exists($reason, '__toString'))
+        ) {
+            $message .= ' with reason: ' . $this->reason;
+        } elseif ($reason instanceof \JsonSerializable) {
+            $message .= ' with reason: '
+                . json_encode($this->reason, JSON_PRETTY_PRINT);
+        }
+
+        parent::__construct($message);
+    }
+
+    /**
+     * Returns the rejection reason.
+     *
+     * @return mixed
+     */
+    public function getReason()
+    {
+        return $this->reason;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/TaskQueue.php

@@ -0,0 +1,66 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * A task queue that executes tasks in a FIFO order.
+ *
+ * This task queue class is used to settle promises asynchronously and
+ * maintains a constant stack size. You can use the task queue asynchronously
+ * by calling the `run()` function of the global task queue in an event loop.
+ *
+ *     GuzzleHttp\Promise\queue()->run();
+ */
+class TaskQueue implements TaskQueueInterface
+{
+    private $enableShutdown = true;
+    private $queue = [];
+
+    public function __construct($withShutdown = true)
+    {
+        if ($withShutdown) {
+            register_shutdown_function(function () {
+                if ($this->enableShutdown) {
+                    // Only run the tasks if an E_ERROR didn't occur.
+                    $err = error_get_last();
+                    if (!$err || ($err['type'] ^ E_ERROR)) {
+                        $this->run();
+                    }
+                }
+            });
+        }
+    }
+
+    public function isEmpty()
+    {
+        return !$this->queue;
+    }
+
+    public function add(callable $task)
+    {
+        $this->queue[] = $task;
+    }
+
+    public function run()
+    {
+        /** @var callable $task */
+        while ($task = array_shift($this->queue)) {
+            $task();
+        }
+    }
+
+    /**
+     * The task queue will be run and exhausted by default when the process
+     * exits IFF the exit is not the result of a PHP E_ERROR error.
+     *
+     * You can disable running the automatic shutdown of the queue by calling
+     * this function. If you disable the task queue shutdown process, then you
+     * MUST either run the task queue (as a result of running your event loop
+     * or manually using the run() method) or wait on each outstanding promise.
+     *
+     * Note: This shutdown will occur before any destructors are triggered.
+     */
+    public function disableShutdown()
+    {
+        $this->enableShutdown = false;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/TaskQueueInterface.php

@@ -0,0 +1,25 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+interface TaskQueueInterface
+{
+    /**
+     * Returns true if the queue is empty.
+     *
+     * @return bool
+     */
+    public function isEmpty();
+
+    /**
+     * Adds a task to the queue that will be executed the next time run is
+     * called.
+     *
+     * @param callable $task
+     */
+    public function add(callable $task);
+
+    /**
+     * Execute all of the pending task in the queue.
+     */
+    public function run();
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/functions.php

@@ -0,0 +1,457 @@
+<?php
+namespace GuzzleHttp\Promise;
+
+/**
+ * Get the global task queue used for promise resolution.
+ *
+ * This task queue MUST be run in an event loop in order for promises to be
+ * settled asynchronously. It will be automatically run when synchronously
+ * waiting on a promise.
+ *
+ * <code>
+ * while ($eventLoop->isRunning()) {
+ *     GuzzleHttp\Promise\queue()->run();
+ * }
+ * </code>
+ *
+ * @param TaskQueueInterface $assign Optionally specify a new queue instance.
+ *
+ * @return TaskQueueInterface
+ */
+function queue(TaskQueueInterface $assign = null)
+{
+    static $queue;
+
+    if ($assign) {
+        $queue = $assign;
+    } elseif (!$queue) {
+        $queue = new TaskQueue();
+    }
+
+    return $queue;
+}
+
+/**
+ * Adds a function to run in the task queue when it is next `run()` and returns
+ * a promise that is fulfilled or rejected with the result.
+ *
+ * @param callable $task Task function to run.
+ *
+ * @return PromiseInterface
+ */
+function task(callable $task)
+{
+    $queue = queue();
+    $promise = new Promise([$queue, 'run']);
+    $queue->add(function () use ($task, $promise) {
+        try {
+            $promise->resolve($task());
+        } catch (\Throwable $e) {
+            $promise->reject($e);
+        } catch (\Exception $e) {
+            $promise->reject($e);
+        }
+    });
+
+    return $promise;
+}
+
+/**
+ * Creates a promise for a value if the value is not a promise.
+ *
+ * @param mixed $value Promise or value.
+ *
+ * @return PromiseInterface
+ */
+function promise_for($value)
+{
+    if ($value instanceof PromiseInterface) {
+        return $value;
+    }
+
+    // Return a Guzzle promise that shadows the given promise.
+    if (method_exists($value, 'then')) {
+        $wfn = method_exists($value, 'wait') ? [$value, 'wait'] : null;
+        $cfn = method_exists($value, 'cancel') ? [$value, 'cancel'] : null;
+        $promise = new Promise($wfn, $cfn);
+        $value->then([$promise, 'resolve'], [$promise, 'reject']);
+        return $promise;
+    }
+
+    return new FulfilledPromise($value);
+}
+
+/**
+ * Creates a rejected promise for a reason if the reason is not a promise. If
+ * the provided reason is a promise, then it is returned as-is.
+ *
+ * @param mixed $reason Promise or reason.
+ *
+ * @return PromiseInterface
+ */
+function rejection_for($reason)
+{
+    if ($reason instanceof PromiseInterface) {
+        return $reason;
+    }
+
+    return new RejectedPromise($reason);
+}
+
+/**
+ * Create an exception for a rejected promise value.
+ *
+ * @param mixed $reason
+ *
+ * @return \Exception|\Throwable
+ */
+function exception_for($reason)
+{
+    return $reason instanceof \Exception || $reason instanceof \Throwable
+        ? $reason
+        : new RejectionException($reason);
+}
+
+/**
+ * Returns an iterator for the given value.
+ *
+ * @param mixed $value
+ *
+ * @return \Iterator
+ */
+function iter_for($value)
+{
+    if ($value instanceof \Iterator) {
+        return $value;
+    } elseif (is_array($value)) {
+        return new \ArrayIterator($value);
+    } else {
+        return new \ArrayIterator([$value]);
+    }
+}
+
+/**
+ * Synchronously waits on a promise to resolve and returns an inspection state
+ * array.
+ *
+ * Returns a state associative array containing a "state" key mapping to a
+ * valid promise state. If the state of the promise is "fulfilled", the array
+ * will contain a "value" key mapping to the fulfilled value of the promise. If
+ * the promise is rejected, the array will contain a "reason" key mapping to
+ * the rejection reason of the promise.
+ *
+ * @param PromiseInterface $promise Promise or value.
+ *
+ * @return array
+ */
+function inspect(PromiseInterface $promise)
+{
+    try {
+        return [
+            'state' => PromiseInterface::FULFILLED,
+            'value' => $promise->wait()
+        ];
+    } catch (RejectionException $e) {
+        return ['state' => PromiseInterface::REJECTED, 'reason' => $e->getReason()];
+    } catch (\Throwable $e) {
+        return ['state' => PromiseInterface::REJECTED, 'reason' => $e];
+    } catch (\Exception $e) {
+        return ['state' => PromiseInterface::REJECTED, 'reason' => $e];
+    }
+}
+
+/**
+ * Waits on all of the provided promises, but does not unwrap rejected promises
+ * as thrown exception.
+ *
+ * Returns an array of inspection state arrays.
+ *
+ * @param PromiseInterface[] $promises Traversable of promises to wait upon.
+ *
+ * @return array
+ * @see GuzzleHttp\Promise\inspect for the inspection state array format.
+ */
+function inspect_all($promises)
+{
+    $results = [];
+    foreach ($promises as $key => $promise) {
+        $results[$key] = inspect($promise);
+    }
+
+    return $results;
+}
+
+/**
+ * Waits on all of the provided promises and returns the fulfilled values.
+ *
+ * Returns an array that contains the value of each promise (in the same order
+ * the promises were provided). An exception is thrown if any of the promises
+ * are rejected.
+ *
+ * @param mixed $promises Iterable of PromiseInterface objects to wait on.
+ *
+ * @return array
+ * @throws \Exception on error
+ * @throws \Throwable on error in PHP >=7
+ */
+function unwrap($promises)
+{
+    $results = [];
+    foreach ($promises as $key => $promise) {
+        $results[$key] = $promise->wait();
+    }
+
+    return $results;
+}
+
+/**
+ * Given an array of promises, return a promise that is fulfilled when all the
+ * items in the array are fulfilled.
+ *
+ * The promise's fulfillment value is an array with fulfillment values at
+ * respective positions to the original array. If any promise in the array
+ * rejects, the returned promise is rejected with the rejection reason.
+ *
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ */
+function all($promises)
+{
+    $results = [];
+    return each(
+        $promises,
+        function ($value, $idx) use (&$results) {
+            $results[$idx] = $value;
+        },
+        function ($reason, $idx, Promise $aggregate) {
+            $aggregate->reject($reason);
+        }
+    )->then(function () use (&$results) {
+        ksort($results);
+        return $results;
+    });
+}
+
+/**
+ * Initiate a competitive race between multiple promises or values (values will
+ * become immediately fulfilled promises).
+ *
+ * When count amount of promises have been fulfilled, the returned promise is
+ * fulfilled with an array that contains the fulfillment values of the winners
+ * in order of resolution.
+ *
+ * This prommise is rejected with a {@see GuzzleHttp\Promise\AggregateException}
+ * if the number of fulfilled promises is less than the desired $count.
+ *
+ * @param int   $count    Total number of promises.
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ */
+function some($count, $promises)
+{
+    $results = [];
+    $rejections = [];
+
+    return each(
+        $promises,
+        function ($value, $idx, PromiseInterface $p) use (&$results, $count) {
+            if ($p->getState() !== PromiseInterface::PENDING) {
+                return;
+            }
+            $results[$idx] = $value;
+            if (count($results) >= $count) {
+                $p->resolve(null);
+            }
+        },
+        function ($reason) use (&$rejections) {
+            $rejections[] = $reason;
+        }
+    )->then(
+        function () use (&$results, &$rejections, $count) {
+            if (count($results) !== $count) {
+                throw new AggregateException(
+                    'Not enough promises to fulfill count',
+                    $rejections
+                );
+            }
+            ksort($results);
+            return array_values($results);
+        }
+    );
+}
+
+/**
+ * Like some(), with 1 as count. However, if the promise fulfills, the
+ * fulfillment value is not an array of 1 but the value directly.
+ *
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ */
+function any($promises)
+{
+    return some(1, $promises)->then(function ($values) { return $values[0]; });
+}
+
+/**
+ * Returns a promise that is fulfilled when all of the provided promises have
+ * been fulfilled or rejected.
+ *
+ * The returned promise is fulfilled with an array of inspection state arrays.
+ *
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ * @see GuzzleHttp\Promise\inspect for the inspection state array format.
+ */
+function settle($promises)
+{
+    $results = [];
+
+    return each(
+        $promises,
+        function ($value, $idx) use (&$results) {
+            $results[$idx] = ['state' => PromiseInterface::FULFILLED, 'value' => $value];
+        },
+        function ($reason, $idx) use (&$results) {
+            $results[$idx] = ['state' => PromiseInterface::REJECTED, 'reason' => $reason];
+        }
+    )->then(function () use (&$results) {
+        ksort($results);
+        return $results;
+    });
+}
+
+/**
+ * Given an iterator that yields promises or values, returns a promise that is
+ * fulfilled with a null value when the iterator has been consumed or the
+ * aggregate promise has been fulfilled or rejected.
+ *
+ * $onFulfilled is a function that accepts the fulfilled value, iterator
+ * index, and the aggregate promise. The callback can invoke any necessary side
+ * effects and choose to resolve or reject the aggregate promise if needed.
+ *
+ * $onRejected is a function that accepts the rejection reason, iterator
+ * index, and the aggregate promise. The callback can invoke any necessary side
+ * effects and choose to resolve or reject the aggregate promise if needed.
+ *
+ * @param mixed    $iterable    Iterator or array to iterate over.
+ * @param callable $onFulfilled
+ * @param callable $onRejected
+ *
+ * @return PromiseInterface
+ */
+function each(
+    $iterable,
+    callable $onFulfilled = null,
+    callable $onRejected = null
+) {
+    return (new EachPromise($iterable, [
+        'fulfilled' => $onFulfilled,
+        'rejected'  => $onRejected
+    ]))->promise();
+}
+
+/**
+ * Like each, but only allows a certain number of outstanding promises at any
+ * given time.
+ *
+ * $concurrency may be an integer or a function that accepts the number of
+ * pending promises and returns a numeric concurrency limit value to allow for
+ * dynamic a concurrency size.
+ *
+ * @param mixed        $iterable
+ * @param int|callable $concurrency
+ * @param callable     $onFulfilled
+ * @param callable     $onRejected
+ *
+ * @return PromiseInterface
+ */
+function each_limit(
+    $iterable,
+    $concurrency,
+    callable $onFulfilled = null,
+    callable $onRejected = null
+) {
+    return (new EachPromise($iterable, [
+        'fulfilled'   => $onFulfilled,
+        'rejected'    => $onRejected,
+        'concurrency' => $concurrency
+    ]))->promise();
+}
+
+/**
+ * Like each_limit, but ensures that no promise in the given $iterable argument
+ * is rejected. If any promise is rejected, then the aggregate promise is
+ * rejected with the encountered rejection.
+ *
+ * @param mixed        $iterable
+ * @param int|callable $concurrency
+ * @param callable     $onFulfilled
+ *
+ * @return PromiseInterface
+ */
+function each_limit_all(
+    $iterable,
+    $concurrency,
+    callable $onFulfilled = null
+) {
+    return each_limit(
+        $iterable,
+        $concurrency,
+        $onFulfilled,
+        function ($reason, $idx, PromiseInterface $aggregate) {
+            $aggregate->reject($reason);
+        }
+    );
+}
+
+/**
+ * Returns true if a promise is fulfilled.
+ *
+ * @param PromiseInterface $promise
+ *
+ * @return bool
+ */
+function is_fulfilled(PromiseInterface $promise)
+{
+    return $promise->getState() === PromiseInterface::FULFILLED;
+}
+
+/**
+ * Returns true if a promise is rejected.
+ *
+ * @param PromiseInterface $promise
+ *
+ * @return bool
+ */
+function is_rejected(PromiseInterface $promise)
+{
+    return $promise->getState() === PromiseInterface::REJECTED;
+}
+
+/**
+ * Returns true if a promise is fulfilled or rejected.
+ *
+ * @param PromiseInterface $promise
+ *
+ * @return bool
+ */
+function is_settled(PromiseInterface $promise)
+{
+    return $promise->getState() !== PromiseInterface::PENDING;
+}
+
+/**
+ * @see Coroutine
+ *
+ * @param callable $generatorFn
+ *
+ * @return PromiseInterface
+ */
+function coroutine(callable $generatorFn)
+{
+    return new Coroutine($generatorFn);
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/promises/src/functions_include.php

@@ -0,0 +1,6 @@
+<?php
+
+// Don't redefine the functions if included multiple times.
+if (!function_exists('GuzzleHttp\Promise\promise_for')) {
+    require __DIR__ . '/functions.php';
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2015 Michael Dowling, https://github.com/mtdowling <mtdowling@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/AppendStream.php

@@ -0,0 +1,241 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Reads from multiple streams, one after the other.
+ *
+ * This is a read-only stream decorator.
+ */
+class AppendStream implements StreamInterface
+{
+    /** @var StreamInterface[] Streams being decorated */
+    private $streams = [];
+
+    private $seekable = true;
+    private $current = 0;
+    private $pos = 0;
+
+    /**
+     * @param StreamInterface[] $streams Streams to decorate. Each stream must
+     *                                   be readable.
+     */
+    public function __construct(array $streams = [])
+    {
+        foreach ($streams as $stream) {
+            $this->addStream($stream);
+        }
+    }
+
+    public function __toString()
+    {
+        try {
+            $this->rewind();
+            return $this->getContents();
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    /**
+     * Add a stream to the AppendStream
+     *
+     * @param StreamInterface $stream Stream to append. Must be readable.
+     *
+     * @throws \InvalidArgumentException if the stream is not readable
+     */
+    public function addStream(StreamInterface $stream)
+    {
+        if (!$stream->isReadable()) {
+            throw new \InvalidArgumentException('Each stream must be readable');
+        }
+
+        // The stream is only seekable if all streams are seekable
+        if (!$stream->isSeekable()) {
+            $this->seekable = false;
+        }
+
+        $this->streams[] = $stream;
+    }
+
+    public function getContents()
+    {
+        return copy_to_string($this);
+    }
+
+    /**
+     * Closes each attached stream.
+     *
+     * {@inheritdoc}
+     */
+    public function close()
+    {
+        $this->pos = $this->current = 0;
+        $this->seekable = true;
+
+        foreach ($this->streams as $stream) {
+            $stream->close();
+        }
+
+        $this->streams = [];
+    }
+
+    /**
+     * Detaches each attached stream.
+     *
+     * Returns null as it's not clear which underlying stream resource to return.
+     *
+     * {@inheritdoc}
+     */
+    public function detach()
+    {
+        $this->pos = $this->current = 0;
+        $this->seekable = true;
+
+        foreach ($this->streams as $stream) {
+            $stream->detach();
+        }
+
+        $this->streams = [];
+    }
+
+    public function tell()
+    {
+        return $this->pos;
+    }
+
+    /**
+     * Tries to calculate the size by adding the size of each stream.
+     *
+     * If any of the streams do not return a valid number, then the size of the
+     * append stream cannot be determined and null is returned.
+     *
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        $size = 0;
+
+        foreach ($this->streams as $stream) {
+            $s = $stream->getSize();
+            if ($s === null) {
+                return null;
+            }
+            $size += $s;
+        }
+
+        return $size;
+    }
+
+    public function eof()
+    {
+        return !$this->streams ||
+            ($this->current >= count($this->streams) - 1 &&
+             $this->streams[$this->current]->eof());
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    /**
+     * Attempts to seek to the given position. Only supports SEEK_SET.
+     *
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if (!$this->seekable) {
+            throw new \RuntimeException('This AppendStream is not seekable');
+        } elseif ($whence !== SEEK_SET) {
+            throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
+        }
+
+        $this->pos = $this->current = 0;
+
+        // Rewind each stream
+        foreach ($this->streams as $i => $stream) {
+            try {
+                $stream->rewind();
+            } catch (\Exception $e) {
+                throw new \RuntimeException('Unable to seek stream '
+                    . $i . ' of the AppendStream', 0, $e);
+            }
+        }
+
+        // Seek to the actual position by reading from each stream
+        while ($this->pos < $offset && !$this->eof()) {
+            $result = $this->read(min(8096, $offset - $this->pos));
+            if ($result === '') {
+                break;
+            }
+        }
+    }
+
+    /**
+     * Reads from all of the appended streams until the length is met or EOF.
+     *
+     * {@inheritdoc}
+     */
+    public function read($length)
+    {
+        $buffer = '';
+        $total = count($this->streams) - 1;
+        $remaining = $length;
+        $progressToNext = false;
+
+        while ($remaining > 0) {
+
+            // Progress to the next stream if needed.
+            if ($progressToNext || $this->streams[$this->current]->eof()) {
+                $progressToNext = false;
+                if ($this->current === $total) {
+                    break;
+                }
+                $this->current++;
+            }
+
+            $result = $this->streams[$this->current]->read($remaining);
+
+            // Using a loose comparison here to match on '', false, and null
+            if ($result == null) {
+                $progressToNext = true;
+                continue;
+            }
+
+            $buffer .= $result;
+            $remaining = $length - strlen($buffer);
+        }
+
+        $this->pos += strlen($buffer);
+
+        return $buffer;
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    public function isSeekable()
+    {
+        return $this->seekable;
+    }
+
+    public function write($string)
+    {
+        throw new \RuntimeException('Cannot write to an AppendStream');
+    }
+
+    public function getMetadata($key = null)
+    {
+        return $key ? null : [];
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/BufferStream.php

@@ -0,0 +1,137 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Provides a buffer stream that can be written to to fill a buffer, and read
+ * from to remove bytes from the buffer.
+ *
+ * This stream returns a "hwm" metadata value that tells upstream consumers
+ * what the configured high water mark of the stream is, or the maximum
+ * preferred size of the buffer.
+ */
+class BufferStream implements StreamInterface
+{
+    private $hwm;
+    private $buffer = '';
+
+    /**
+     * @param int $hwm High water mark, representing the preferred maximum
+     *                 buffer size. If the size of the buffer exceeds the high
+     *                 water mark, then calls to write will continue to succeed
+     *                 but will return false to inform writers to slow down
+     *                 until the buffer has been drained by reading from it.
+     */
+    public function __construct($hwm = 16384)
+    {
+        $this->hwm = $hwm;
+    }
+
+    public function __toString()
+    {
+        return $this->getContents();
+    }
+
+    public function getContents()
+    {
+        $buffer = $this->buffer;
+        $this->buffer = '';
+
+        return $buffer;
+    }
+
+    public function close()
+    {
+        $this->buffer = '';
+    }
+
+    public function detach()
+    {
+        $this->close();
+    }
+
+    public function getSize()
+    {
+        return strlen($this->buffer);
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function isWritable()
+    {
+        return true;
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a BufferStream');
+    }
+
+    public function eof()
+    {
+        return strlen($this->buffer) === 0;
+    }
+
+    public function tell()
+    {
+        throw new \RuntimeException('Cannot determine the position of a BufferStream');
+    }
+
+    /**
+     * Reads data from the buffer.
+     */
+    public function read($length)
+    {
+        $currentLength = strlen($this->buffer);
+
+        if ($length >= $currentLength) {
+            // No need to slice the buffer because we don't have enough data.
+            $result = $this->buffer;
+            $this->buffer = '';
+        } else {
+            // Slice up the result to provide a subset of the buffer.
+            $result = substr($this->buffer, 0, $length);
+            $this->buffer = substr($this->buffer, $length);
+        }
+
+        return $result;
+    }
+
+    /**
+     * Writes data to the buffer.
+     */
+    public function write($string)
+    {
+        $this->buffer .= $string;
+
+        // TODO: What should happen here?
+        if (strlen($this->buffer) >= $this->hwm) {
+            return false;
+        }
+
+        return strlen($string);
+    }
+
+    public function getMetadata($key = null)
+    {
+        if ($key == 'hwm') {
+            return $this->hwm;
+        }
+
+        return $key ? null : [];
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/CachingStream.php

@@ -0,0 +1,138 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that can cache previously read bytes from a sequentially
+ * read stream.
+ */
+class CachingStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var StreamInterface Stream being wrapped */
+    private $remoteStream;
+
+    /** @var int Number of bytes to skip reading due to a write on the buffer */
+    private $skipReadBytes = 0;
+
+    /**
+     * We will treat the buffer object as the body of the stream
+     *
+     * @param StreamInterface $stream Stream to cache
+     * @param StreamInterface $target Optionally specify where data is cached
+     */
+    public function __construct(
+        StreamInterface $stream,
+        StreamInterface $target = null
+    ) {
+        $this->remoteStream = $stream;
+        $this->stream = $target ?: new Stream(fopen('php://temp', 'r+'));
+    }
+
+    public function getSize()
+    {
+        return max($this->stream->getSize(), $this->remoteStream->getSize());
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if ($whence == SEEK_SET) {
+            $byte = $offset;
+        } elseif ($whence == SEEK_CUR) {
+            $byte = $offset + $this->tell();
+        } elseif ($whence == SEEK_END) {
+            $size = $this->remoteStream->getSize();
+            if ($size === null) {
+                $size = $this->cacheEntireStream();
+            }
+            $byte = $size + $offset;
+        } else {
+            throw new \InvalidArgumentException('Invalid whence');
+        }
+
+        $diff = $byte - $this->stream->getSize();
+
+        if ($diff > 0) {
+            // Read the remoteStream until we have read in at least the amount
+            // of bytes requested, or we reach the end of the file.
+            while ($diff > 0 && !$this->remoteStream->eof()) {
+                $this->read($diff);
+                $diff = $byte - $this->stream->getSize();
+            }
+        } else {
+            // We can just do a normal seek since we've already seen this byte.
+            $this->stream->seek($byte);
+        }
+    }
+
+    public function read($length)
+    {
+        // Perform a regular read on any previously read data from the buffer
+        $data = $this->stream->read($length);
+        $remaining = $length - strlen($data);
+
+        // More data was requested so read from the remote stream
+        if ($remaining) {
+            // If data was written to the buffer in a position that would have
+            // been filled from the remote stream, then we must skip bytes on
+            // the remote stream to emulate overwriting bytes from that
+            // position. This mimics the behavior of other PHP stream wrappers.
+            $remoteData = $this->remoteStream->read(
+                $remaining + $this->skipReadBytes
+            );
+
+            if ($this->skipReadBytes) {
+                $len = strlen($remoteData);
+                $remoteData = substr($remoteData, $this->skipReadBytes);
+                $this->skipReadBytes = max(0, $this->skipReadBytes - $len);
+            }
+
+            $data .= $remoteData;
+            $this->stream->write($remoteData);
+        }
+
+        return $data;
+    }
+
+    public function write($string)
+    {
+        // When appending to the end of the currently read stream, you'll want
+        // to skip bytes from being read from the remote stream to emulate
+        // other stream wrappers. Basically replacing bytes of data of a fixed
+        // length.
+        $overflow = (strlen($string) + $this->tell()) - $this->remoteStream->tell();
+        if ($overflow > 0) {
+            $this->skipReadBytes += $overflow;
+        }
+
+        return $this->stream->write($string);
+    }
+
+    public function eof()
+    {
+        return $this->stream->eof() && $this->remoteStream->eof();
+    }
+
+    /**
+     * Close both the remote stream and buffer stream
+     */
+    public function close()
+    {
+        $this->remoteStream->close() && $this->stream->close();
+    }
+
+    private function cacheEntireStream()
+    {
+        $target = new FnStream(['write' => 'strlen']);
+        copy_to_stream($this, $target);
+
+        return $this->tell();
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/DroppingStream.php

@@ -0,0 +1,42 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that begins dropping data once the size of the underlying
+ * stream becomes too full.
+ */
+class DroppingStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    private $maxLength;
+
+    /**
+     * @param StreamInterface $stream    Underlying stream to decorate.
+     * @param int             $maxLength Maximum size before dropping data.
+     */
+    public function __construct(StreamInterface $stream, $maxLength)
+    {
+        $this->stream = $stream;
+        $this->maxLength = $maxLength;
+    }
+
+    public function write($string)
+    {
+        $diff = $this->maxLength - $this->stream->getSize();
+
+        // Begin returning 0 when the underlying stream is too large.
+        if ($diff <= 0) {
+            return 0;
+        }
+
+        // Write the stream or a subset of the stream if needed.
+        if (strlen($string) < $diff) {
+            return $this->stream->write($string);
+        }
+
+        return $this->stream->write(substr($string, 0, $diff));
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/FnStream.php

@@ -0,0 +1,158 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Compose stream implementations based on a hash of functions.
+ *
+ * Allows for easy testing and extension of a provided stream without needing
+ * to create a concrete class for a simple extension point.
+ */
+class FnStream implements StreamInterface
+{
+    /** @var array */
+    private $methods;
+
+    /** @var array Methods that must be implemented in the given array */
+    private static $slots = ['__toString', 'close', 'detach', 'rewind',
+        'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write',
+        'isReadable', 'read', 'getContents', 'getMetadata'];
+
+    /**
+     * @param array $methods Hash of method name to a callable.
+     */
+    public function __construct(array $methods)
+    {
+        $this->methods = $methods;
+
+        // Create the functions on the class
+        foreach ($methods as $name => $fn) {
+            $this->{'_fn_' . $name} = $fn;
+        }
+    }
+
+    /**
+     * Lazily determine which methods are not implemented.
+     * @throws \BadMethodCallException
+     */
+    public function __get($name)
+    {
+        throw new \BadMethodCallException(str_replace('_fn_', '', $name)
+            . '() is not implemented in the FnStream');
+    }
+
+    /**
+     * The close method is called on the underlying stream only if possible.
+     */
+    public function __destruct()
+    {
+        if (isset($this->_fn_close)) {
+            call_user_func($this->_fn_close);
+        }
+    }
+
+    /**
+     * An unserialize would allow the __destruct to run when the unserialized value goes out of scope.
+     * @throws \LogicException
+     */
+    public function __wakeup()
+    {
+        throw new \LogicException('FnStream should never be unserialized');
+    }
+
+    /**
+     * Adds custom functionality to an underlying stream by intercepting
+     * specific method calls.
+     *
+     * @param StreamInterface $stream  Stream to decorate
+     * @param array           $methods Hash of method name to a closure
+     *
+     * @return FnStream
+     */
+    public static function decorate(StreamInterface $stream, array $methods)
+    {
+        // If any of the required methods were not provided, then simply
+        // proxy to the decorated stream.
+        foreach (array_diff(self::$slots, array_keys($methods)) as $diff) {
+            $methods[$diff] = [$stream, $diff];
+        }
+
+        return new self($methods);
+    }
+
+    public function __toString()
+    {
+        return call_user_func($this->_fn___toString);
+    }
+
+    public function close()
+    {
+        return call_user_func($this->_fn_close);
+    }
+
+    public function detach()
+    {
+        return call_user_func($this->_fn_detach);
+    }
+
+    public function getSize()
+    {
+        return call_user_func($this->_fn_getSize);
+    }
+
+    public function tell()
+    {
+        return call_user_func($this->_fn_tell);
+    }
+
+    public function eof()
+    {
+        return call_user_func($this->_fn_eof);
+    }
+
+    public function isSeekable()
+    {
+        return call_user_func($this->_fn_isSeekable);
+    }
+
+    public function rewind()
+    {
+        call_user_func($this->_fn_rewind);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        call_user_func($this->_fn_seek, $offset, $whence);
+    }
+
+    public function isWritable()
+    {
+        return call_user_func($this->_fn_isWritable);
+    }
+
+    public function write($string)
+    {
+        return call_user_func($this->_fn_write, $string);
+    }
+
+    public function isReadable()
+    {
+        return call_user_func($this->_fn_isReadable);
+    }
+
+    public function read($length)
+    {
+        return call_user_func($this->_fn_read, $length);
+    }
+
+    public function getContents()
+    {
+        return call_user_func($this->_fn_getContents);
+    }
+
+    public function getMetadata($key = null)
+    {
+        return call_user_func($this->_fn_getMetadata, $key);
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/InflateStream.php

@@ -0,0 +1,52 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Uses PHP's zlib.inflate filter to inflate deflate or gzipped content.
+ *
+ * This stream decorator skips the first 10 bytes of the given stream to remove
+ * the gzip header, converts the provided stream to a PHP stream resource,
+ * then appends the zlib.inflate filter. The stream is then converted back
+ * to a Guzzle stream resource to be used as a Guzzle stream.
+ *
+ * @link http://tools.ietf.org/html/rfc1952
+ * @link http://php.net/manual/en/filters.compression.php
+ */
+class InflateStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    public function __construct(StreamInterface $stream)
+    {
+        // read the first 10 bytes, ie. gzip header
+        $header = $stream->read(10);
+        $filenameHeaderLength = $this->getLengthOfPossibleFilenameHeader($stream, $header);
+        // Skip the header, that is 10 + length of filename + 1 (nil) bytes
+        $stream = new LimitStream($stream, -1, 10 + $filenameHeaderLength);
+        $resource = StreamWrapper::getResource($stream);
+        stream_filter_append($resource, 'zlib.inflate', STREAM_FILTER_READ);
+        $this->stream = $stream->isSeekable() ? new Stream($resource) : new NoSeekStream(new Stream($resource));
+    }
+
+    /**
+     * @param StreamInterface $stream
+     * @param $header
+     * @return int
+     */
+    private function getLengthOfPossibleFilenameHeader(StreamInterface $stream, $header)
+    {
+        $filename_header_length = 0;
+
+        if (substr(bin2hex($header), 6, 2) === '08') {
+            // we have a filename, read until nil
+            $filename_header_length = 1;
+            while ($stream->read(1) !== chr(0)) {
+                $filename_header_length++;
+            }
+        }
+
+        return $filename_header_length;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/LazyOpenStream.php

@@ -0,0 +1,39 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Lazily reads or writes to a file that is opened only after an IO operation
+ * take place on the stream.
+ */
+class LazyOpenStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var string File to open */
+    private $filename;
+
+    /** @var string $mode */
+    private $mode;
+
+    /**
+     * @param string $filename File to lazily open
+     * @param string $mode     fopen mode to use when opening the stream
+     */
+    public function __construct($filename, $mode)
+    {
+        $this->filename = $filename;
+        $this->mode = $mode;
+    }
+
+    /**
+     * Creates the underlying stream lazily when required.
+     *
+     * @return StreamInterface
+     */
+    protected function createStream()
+    {
+        return stream_for(try_fopen($this->filename, $this->mode));
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/LimitStream.php

@@ -0,0 +1,155 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+
+/**
+ * Decorator used to return only a subset of a stream
+ */
+class LimitStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    /** @var int Offset to start reading from */
+    private $offset;
+
+    /** @var int Limit the number of bytes that can be read */
+    private $limit;
+
+    /**
+     * @param StreamInterface $stream Stream to wrap
+     * @param int             $limit  Total number of bytes to allow to be read
+     *                                from the stream. Pass -1 for no limit.
+     * @param int             $offset Position to seek to before reading (only
+     *                                works on seekable streams).
+     */
+    public function __construct(
+        StreamInterface $stream,
+        $limit = -1,
+        $offset = 0
+    ) {
+        $this->stream = $stream;
+        $this->setLimit($limit);
+        $this->setOffset($offset);
+    }
+
+    public function eof()
+    {
+        // Always return true if the underlying stream is EOF
+        if ($this->stream->eof()) {
+            return true;
+        }
+
+        // No limit and the underlying stream is not at EOF
+        if ($this->limit == -1) {
+            return false;
+        }
+
+        return $this->stream->tell() >= $this->offset + $this->limit;
+    }
+
+    /**
+     * Returns the size of the limited subset of data
+     * {@inheritdoc}
+     */
+    public function getSize()
+    {
+        if (null === ($length = $this->stream->getSize())) {
+            return null;
+        } elseif ($this->limit == -1) {
+            return $length - $this->offset;
+        } else {
+            return min($this->limit, $length - $this->offset);
+        }
+    }
+
+    /**
+     * Allow for a bounded seek on the read limited stream
+     * {@inheritdoc}
+     */
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        if ($whence !== SEEK_SET || $offset < 0) {
+            throw new \RuntimeException(sprintf(
+                'Cannot seek to offset %s with whence %s',
+                $offset,
+                $whence
+            ));
+        }
+
+        $offset += $this->offset;
+
+        if ($this->limit !== -1) {
+            if ($offset > $this->offset + $this->limit) {
+                $offset = $this->offset + $this->limit;
+            }
+        }
+
+        $this->stream->seek($offset);
+    }
+
+    /**
+     * Give a relative tell()
+     * {@inheritdoc}
+     */
+    public function tell()
+    {
+        return $this->stream->tell() - $this->offset;
+    }
+
+    /**
+     * Set the offset to start limiting from
+     *
+     * @param int $offset Offset to seek to and begin byte limiting from
+     *
+     * @throws \RuntimeException if the stream cannot be seeked.
+     */
+    public function setOffset($offset)
+    {
+        $current = $this->stream->tell();
+
+        if ($current !== $offset) {
+            // If the stream cannot seek to the offset position, then read to it
+            if ($this->stream->isSeekable()) {
+                $this->stream->seek($offset);
+            } elseif ($current > $offset) {
+                throw new \RuntimeException("Could not seek to stream offset $offset");
+            } else {
+                $this->stream->read($offset - $current);
+            }
+        }
+
+        $this->offset = $offset;
+    }
+
+    /**
+     * Set the limit of bytes that the decorator allows to be read from the
+     * stream.
+     *
+     * @param int $limit Number of bytes to allow to be read from the stream.
+     *                   Use -1 for no limit.
+     */
+    public function setLimit($limit)
+    {
+        $this->limit = $limit;
+    }
+
+    public function read($length)
+    {
+        if ($this->limit == -1) {
+            return $this->stream->read($length);
+        }
+
+        // Check if the current position is less than the total allowed
+        // bytes + original offset
+        $remaining = ($this->offset + $this->limit) - $this->stream->tell();
+        if ($remaining > 0) {
+            // Only return the amount of requested data, ensuring that the byte
+            // limit is not exceeded
+            return $this->stream->read(min($remaining, $length));
+        }
+
+        return '';
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/MessageTrait.php

@@ -0,0 +1,213 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Trait implementing functionality common to requests and responses.
+ */
+trait MessageTrait
+{
+    /** @var array Map of all registered headers, as original name => array of values */
+    private $headers = [];
+
+    /** @var array Map of lowercase header name => original name at registration */
+    private $headerNames  = [];
+
+    /** @var string */
+    private $protocol = '1.1';
+
+    /** @var StreamInterface */
+    private $stream;
+
+    public function getProtocolVersion()
+    {
+        return $this->protocol;
+    }
+
+    public function withProtocolVersion($version)
+    {
+        if ($this->protocol === $version) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->protocol = $version;
+        return $new;
+    }
+
+    public function getHeaders()
+    {
+        return $this->headers;
+    }
+
+    public function hasHeader($header)
+    {
+        return isset($this->headerNames[strtolower($header)]);
+    }
+
+    public function getHeader($header)
+    {
+        $header = strtolower($header);
+
+        if (!isset($this->headerNames[$header])) {
+            return [];
+        }
+
+        $header = $this->headerNames[$header];
+
+        return $this->headers[$header];
+    }
+
+    public function getHeaderLine($header)
+    {
+        return implode(', ', $this->getHeader($header));
+    }
+
+    public function withHeader($header, $value)
+    {
+        $this->assertHeader($header);
+        $value = $this->normalizeHeaderValue($value);
+        $normalized = strtolower($header);
+
+        $new = clone $this;
+        if (isset($new->headerNames[$normalized])) {
+            unset($new->headers[$new->headerNames[$normalized]]);
+        }
+        $new->headerNames[$normalized] = $header;
+        $new->headers[$header] = $value;
+
+        return $new;
+    }
+
+    public function withAddedHeader($header, $value)
+    {
+        $this->assertHeader($header);
+        $value = $this->normalizeHeaderValue($value);
+        $normalized = strtolower($header);
+
+        $new = clone $this;
+        if (isset($new->headerNames[$normalized])) {
+            $header = $this->headerNames[$normalized];
+            $new->headers[$header] = array_merge($this->headers[$header], $value);
+        } else {
+            $new->headerNames[$normalized] = $header;
+            $new->headers[$header] = $value;
+        }
+
+        return $new;
+    }
+
+    public function withoutHeader($header)
+    {
+        $normalized = strtolower($header);
+
+        if (!isset($this->headerNames[$normalized])) {
+            return $this;
+        }
+
+        $header = $this->headerNames[$normalized];
+
+        $new = clone $this;
+        unset($new->headers[$header], $new->headerNames[$normalized]);
+
+        return $new;
+    }
+
+    public function getBody()
+    {
+        if (!$this->stream) {
+            $this->stream = stream_for('');
+        }
+
+        return $this->stream;
+    }
+
+    public function withBody(StreamInterface $body)
+    {
+        if ($body === $this->stream) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->stream = $body;
+        return $new;
+    }
+
+    private function setHeaders(array $headers)
+    {
+        $this->headerNames = $this->headers = [];
+        foreach ($headers as $header => $value) {
+            if (is_int($header)) {
+                // Numeric array keys are converted to int by PHP but having a header name '123' is not forbidden by the spec
+                // and also allowed in withHeader(). So we need to cast it to string again for the following assertion to pass.
+                $header = (string) $header;
+            }
+            $this->assertHeader($header);
+            $value = $this->normalizeHeaderValue($value);
+            $normalized = strtolower($header);
+            if (isset($this->headerNames[$normalized])) {
+                $header = $this->headerNames[$normalized];
+                $this->headers[$header] = array_merge($this->headers[$header], $value);
+            } else {
+                $this->headerNames[$normalized] = $header;
+                $this->headers[$header] = $value;
+            }
+        }
+    }
+
+    private function normalizeHeaderValue($value)
+    {
+        if (!is_array($value)) {
+            return $this->trimHeaderValues([$value]);
+        }
+
+        if (count($value) === 0) {
+            throw new \InvalidArgumentException('Header value can not be an empty array.');
+        }
+
+        return $this->trimHeaderValues($value);
+    }
+
+    /**
+     * Trims whitespace from the header values.
+     *
+     * Spaces and tabs ought to be excluded by parsers when extracting the field value from a header field.
+     *
+     * header-field = field-name ":" OWS field-value OWS
+     * OWS          = *( SP / HTAB )
+     *
+     * @param string[] $values Header values
+     *
+     * @return string[] Trimmed header values
+     *
+     * @see https://tools.ietf.org/html/rfc7230#section-3.2.4
+     */
+    private function trimHeaderValues(array $values)
+    {
+        return array_map(function ($value) {
+            if (!is_scalar($value) && null !== $value) {
+                throw new \InvalidArgumentException(sprintf(
+                    'Header value must be scalar or null but %s provided.',
+                    is_object($value) ? get_class($value) : gettype($value)
+                ));
+            }
+
+            return trim((string) $value, " \t");
+        }, $values);
+    }
+
+    private function assertHeader($header)
+    {
+        if (!is_string($header)) {
+            throw new \InvalidArgumentException(sprintf(
+                'Header name must be a string but %s provided.',
+                is_object($header) ? get_class($header) : gettype($header)
+            ));
+        }
+
+        if ($header === '') {
+            throw new \InvalidArgumentException('Header name can not be empty.');
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/MultipartStream.php

@@ -0,0 +1,153 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream that when read returns bytes for a streaming multipart or
+ * multipart/form-data stream.
+ */
+class MultipartStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    private $boundary;
+
+    /**
+     * @param array  $elements Array of associative arrays, each containing a
+     *                         required "name" key mapping to the form field,
+     *                         name, a required "contents" key mapping to a
+     *                         StreamInterface/resource/string, an optional
+     *                         "headers" associative array of custom headers,
+     *                         and an optional "filename" key mapping to a
+     *                         string to send as the filename in the part.
+     * @param string $boundary You can optionally provide a specific boundary
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function __construct(array $elements = [], $boundary = null)
+    {
+        $this->boundary = $boundary ?: sha1(uniqid('', true));
+        $this->stream = $this->createStream($elements);
+    }
+
+    /**
+     * Get the boundary
+     *
+     * @return string
+     */
+    public function getBoundary()
+    {
+        return $this->boundary;
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    /**
+     * Get the headers needed before transferring the content of a POST file
+     */
+    private function getHeaders(array $headers)
+    {
+        $str = '';
+        foreach ($headers as $key => $value) {
+            $str .= "{$key}: {$value}\r\n";
+        }
+
+        return "--{$this->boundary}\r\n" . trim($str) . "\r\n\r\n";
+    }
+
+    /**
+     * Create the aggregate stream that will be used to upload the POST data
+     */
+    protected function createStream(array $elements)
+    {
+        $stream = new AppendStream();
+
+        foreach ($elements as $element) {
+            $this->addElement($stream, $element);
+        }
+
+        // Add the trailing boundary with CRLF
+        $stream->addStream(stream_for("--{$this->boundary}--\r\n"));
+
+        return $stream;
+    }
+
+    private function addElement(AppendStream $stream, array $element)
+    {
+        foreach (['contents', 'name'] as $key) {
+            if (!array_key_exists($key, $element)) {
+                throw new \InvalidArgumentException("A '{$key}' key is required");
+            }
+        }
+
+        $element['contents'] = stream_for($element['contents']);
+
+        if (empty($element['filename'])) {
+            $uri = $element['contents']->getMetadata('uri');
+            if (substr($uri, 0, 6) !== 'php://') {
+                $element['filename'] = $uri;
+            }
+        }
+
+        list($body, $headers) = $this->createElement(
+            $element['name'],
+            $element['contents'],
+            isset($element['filename']) ? $element['filename'] : null,
+            isset($element['headers']) ? $element['headers'] : []
+        );
+
+        $stream->addStream(stream_for($this->getHeaders($headers)));
+        $stream->addStream($body);
+        $stream->addStream(stream_for("\r\n"));
+    }
+
+    /**
+     * @return array
+     */
+    private function createElement($name, StreamInterface $stream, $filename, array $headers)
+    {
+        // Set a default content-disposition header if one was no provided
+        $disposition = $this->getHeader($headers, 'content-disposition');
+        if (!$disposition) {
+            $headers['Content-Disposition'] = ($filename === '0' || $filename)
+                ? sprintf('form-data; name="%s"; filename="%s"',
+                    $name,
+                    basename($filename))
+                : "form-data; name=\"{$name}\"";
+        }
+
+        // Set a default content-length header if one was no provided
+        $length = $this->getHeader($headers, 'content-length');
+        if (!$length) {
+            if ($length = $stream->getSize()) {
+                $headers['Content-Length'] = (string) $length;
+            }
+        }
+
+        // Set a default Content-Type if one was not supplied
+        $type = $this->getHeader($headers, 'content-type');
+        if (!$type && ($filename === '0' || $filename)) {
+            if ($type = mimetype_from_filename($filename)) {
+                $headers['Content-Type'] = $type;
+            }
+        }
+
+        return [$stream, $headers];
+    }
+
+    private function getHeader(array $headers, $key)
+    {
+        $lowercaseHeader = strtolower($key);
+        foreach ($headers as $k => $v) {
+            if (strtolower($k) === $lowercaseHeader) {
+                return $v;
+            }
+        }
+
+        return null;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/NoSeekStream.php

@@ -0,0 +1,22 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator that prevents a stream from being seeked
+ */
+class NoSeekStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a NoSeekStream');
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/PumpStream.php

@@ -0,0 +1,165 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Provides a read only stream that pumps data from a PHP callable.
+ *
+ * When invoking the provided callable, the PumpStream will pass the amount of
+ * data requested to read to the callable. The callable can choose to ignore
+ * this value and return fewer or more bytes than requested. Any extra data
+ * returned by the provided callable is buffered internally until drained using
+ * the read() function of the PumpStream. The provided callable MUST return
+ * false when there is no more data to read.
+ */
+class PumpStream implements StreamInterface
+{
+    /** @var callable */
+    private $source;
+
+    /** @var int */
+    private $size;
+
+    /** @var int */
+    private $tellPos = 0;
+
+    /** @var array */
+    private $metadata;
+
+    /** @var BufferStream */
+    private $buffer;
+
+    /**
+     * @param callable $source Source of the stream data. The callable MAY
+     *                         accept an integer argument used to control the
+     *                         amount of data to return. The callable MUST
+     *                         return a string when called, or false on error
+     *                         or EOF.
+     * @param array $options   Stream options:
+     *                         - metadata: Hash of metadata to use with stream.
+     *                         - size: Size of the stream, if known.
+     */
+    public function __construct(callable $source, array $options = [])
+    {
+        $this->source = $source;
+        $this->size = isset($options['size']) ? $options['size'] : null;
+        $this->metadata = isset($options['metadata']) ? $options['metadata'] : [];
+        $this->buffer = new BufferStream();
+    }
+
+    public function __toString()
+    {
+        try {
+            return copy_to_string($this);
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    public function close()
+    {
+        $this->detach();
+    }
+
+    public function detach()
+    {
+        $this->tellPos = false;
+        $this->source = null;
+    }
+
+    public function getSize()
+    {
+        return $this->size;
+    }
+
+    public function tell()
+    {
+        return $this->tellPos;
+    }
+
+    public function eof()
+    {
+        return !$this->source;
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        throw new \RuntimeException('Cannot seek a PumpStream');
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    public function write($string)
+    {
+        throw new \RuntimeException('Cannot write to a PumpStream');
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function read($length)
+    {
+        $data = $this->buffer->read($length);
+        $readLen = strlen($data);
+        $this->tellPos += $readLen;
+        $remaining = $length - $readLen;
+
+        if ($remaining) {
+            $this->pump($remaining);
+            $data .= $this->buffer->read($remaining);
+            $this->tellPos += strlen($data) - $readLen;
+        }
+
+        return $data;
+    }
+
+    public function getContents()
+    {
+        $result = '';
+        while (!$this->eof()) {
+            $result .= $this->read(1000000);
+        }
+
+        return $result;
+    }
+
+    public function getMetadata($key = null)
+    {
+        if (!$key) {
+            return $this->metadata;
+        }
+
+        return isset($this->metadata[$key]) ? $this->metadata[$key] : null;
+    }
+
+    private function pump($length)
+    {
+        if ($this->source) {
+            do {
+                $data = call_user_func($this->source, $length);
+                if ($data === false || $data === null) {
+                    $this->source = null;
+                    return;
+                }
+                $this->buffer->write($data);
+                $length -= strlen($data);
+            } while ($length > 0);
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/Request.php

@@ -0,0 +1,151 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * PSR-7 request implementation.
+ */
+class Request implements RequestInterface
+{
+    use MessageTrait;
+
+    /** @var string */
+    private $method;
+
+    /** @var null|string */
+    private $requestTarget;
+
+    /** @var UriInterface */
+    private $uri;
+
+    /**
+     * @param string                               $method  HTTP method
+     * @param string|UriInterface                  $uri     URI
+     * @param array                                $headers Request headers
+     * @param string|null|resource|StreamInterface $body    Request body
+     * @param string                               $version Protocol version
+     */
+    public function __construct(
+        $method,
+        $uri,
+        array $headers = [],
+        $body = null,
+        $version = '1.1'
+    ) {
+        $this->assertMethod($method);
+        if (!($uri instanceof UriInterface)) {
+            $uri = new Uri($uri);
+        }
+
+        $this->method = strtoupper($method);
+        $this->uri = $uri;
+        $this->setHeaders($headers);
+        $this->protocol = $version;
+
+        if (!isset($this->headerNames['host'])) {
+            $this->updateHostFromUri();
+        }
+
+        if ($body !== '' && $body !== null) {
+            $this->stream = stream_for($body);
+        }
+    }
+
+    public function getRequestTarget()
+    {
+        if ($this->requestTarget !== null) {
+            return $this->requestTarget;
+        }
+
+        $target = $this->uri->getPath();
+        if ($target == '') {
+            $target = '/';
+        }
+        if ($this->uri->getQuery() != '') {
+            $target .= '?' . $this->uri->getQuery();
+        }
+
+        return $target;
+    }
+
+    public function withRequestTarget($requestTarget)
+    {
+        if (preg_match('#\s#', $requestTarget)) {
+            throw new InvalidArgumentException(
+                'Invalid request target provided; cannot contain whitespace'
+            );
+        }
+
+        $new = clone $this;
+        $new->requestTarget = $requestTarget;
+        return $new;
+    }
+
+    public function getMethod()
+    {
+        return $this->method;
+    }
+
+    public function withMethod($method)
+    {
+        $this->assertMethod($method);
+        $new = clone $this;
+        $new->method = strtoupper($method);
+        return $new;
+    }
+
+    public function getUri()
+    {
+        return $this->uri;
+    }
+
+    public function withUri(UriInterface $uri, $preserveHost = false)
+    {
+        if ($uri === $this->uri) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->uri = $uri;
+
+        if (!$preserveHost || !isset($this->headerNames['host'])) {
+            $new->updateHostFromUri();
+        }
+
+        return $new;
+    }
+
+    private function updateHostFromUri()
+    {
+        $host = $this->uri->getHost();
+
+        if ($host == '') {
+            return;
+        }
+
+        if (($port = $this->uri->getPort()) !== null) {
+            $host .= ':' . $port;
+        }
+
+        if (isset($this->headerNames['host'])) {
+            $header = $this->headerNames['host'];
+        } else {
+            $header = 'Host';
+            $this->headerNames['host'] = 'Host';
+        }
+        // Ensure Host is the first header.
+        // See: http://tools.ietf.org/html/rfc7230#section-5.4
+        $this->headers = [$header => [$host]] + $this->headers;
+    }
+
+    private function assertMethod($method)
+    {
+        if (!is_string($method) || $method === '') {
+            throw new \InvalidArgumentException('Method must be a non-empty string.');
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/Response.php

@@ -0,0 +1,154 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * PSR-7 response implementation.
+ */
+class Response implements ResponseInterface
+{
+    use MessageTrait;
+
+    /** @var array Map of standard HTTP status code/reason phrases */
+    private static $phrases = [
+        100 => 'Continue',
+        101 => 'Switching Protocols',
+        102 => 'Processing',
+        200 => 'OK',
+        201 => 'Created',
+        202 => 'Accepted',
+        203 => 'Non-Authoritative Information',
+        204 => 'No Content',
+        205 => 'Reset Content',
+        206 => 'Partial Content',
+        207 => 'Multi-status',
+        208 => 'Already Reported',
+        300 => 'Multiple Choices',
+        301 => 'Moved Permanently',
+        302 => 'Found',
+        303 => 'See Other',
+        304 => 'Not Modified',
+        305 => 'Use Proxy',
+        306 => 'Switch Proxy',
+        307 => 'Temporary Redirect',
+        400 => 'Bad Request',
+        401 => 'Unauthorized',
+        402 => 'Payment Required',
+        403 => 'Forbidden',
+        404 => 'Not Found',
+        405 => 'Method Not Allowed',
+        406 => 'Not Acceptable',
+        407 => 'Proxy Authentication Required',
+        408 => 'Request Time-out',
+        409 => 'Conflict',
+        410 => 'Gone',
+        411 => 'Length Required',
+        412 => 'Precondition Failed',
+        413 => 'Request Entity Too Large',
+        414 => 'Request-URI Too Large',
+        415 => 'Unsupported Media Type',
+        416 => 'Requested range not satisfiable',
+        417 => 'Expectation Failed',
+        418 => 'I\'m a teapot',
+        422 => 'Unprocessable Entity',
+        423 => 'Locked',
+        424 => 'Failed Dependency',
+        425 => 'Unordered Collection',
+        426 => 'Upgrade Required',
+        428 => 'Precondition Required',
+        429 => 'Too Many Requests',
+        431 => 'Request Header Fields Too Large',
+        451 => 'Unavailable For Legal Reasons',
+        500 => 'Internal Server Error',
+        501 => 'Not Implemented',
+        502 => 'Bad Gateway',
+        503 => 'Service Unavailable',
+        504 => 'Gateway Time-out',
+        505 => 'HTTP Version not supported',
+        506 => 'Variant Also Negotiates',
+        507 => 'Insufficient Storage',
+        508 => 'Loop Detected',
+        511 => 'Network Authentication Required',
+    ];
+
+    /** @var string */
+    private $reasonPhrase = '';
+
+    /** @var int */
+    private $statusCode = 200;
+
+    /**
+     * @param int                                  $status  Status code
+     * @param array                                $headers Response headers
+     * @param string|null|resource|StreamInterface $body    Response body
+     * @param string                               $version Protocol version
+     * @param string|null                          $reason  Reason phrase (when empty a default will be used based on the status code)
+     */
+    public function __construct(
+        $status = 200,
+        array $headers = [],
+        $body = null,
+        $version = '1.1',
+        $reason = null
+    ) {
+        $this->assertStatusCodeIsInteger($status);
+        $status = (int) $status;
+        $this->assertStatusCodeRange($status);
+
+        $this->statusCode = $status;
+
+        if ($body !== '' && $body !== null) {
+            $this->stream = stream_for($body);
+        }
+
+        $this->setHeaders($headers);
+        if ($reason == '' && isset(self::$phrases[$this->statusCode])) {
+            $this->reasonPhrase = self::$phrases[$this->statusCode];
+        } else {
+            $this->reasonPhrase = (string) $reason;
+        }
+
+        $this->protocol = $version;
+    }
+
+    public function getStatusCode()
+    {
+        return $this->statusCode;
+    }
+
+    public function getReasonPhrase()
+    {
+        return $this->reasonPhrase;
+    }
+
+    public function withStatus($code, $reasonPhrase = '')
+    {
+        $this->assertStatusCodeIsInteger($code);
+        $code = (int) $code;
+        $this->assertStatusCodeRange($code);
+
+        $new = clone $this;
+        $new->statusCode = $code;
+        if ($reasonPhrase == '' && isset(self::$phrases[$new->statusCode])) {
+            $reasonPhrase = self::$phrases[$new->statusCode];
+        }
+        $new->reasonPhrase = $reasonPhrase;
+        return $new;
+    }
+
+    private function assertStatusCodeIsInteger($statusCode)
+    {
+        if (filter_var($statusCode, FILTER_VALIDATE_INT) === false) {
+            throw new \InvalidArgumentException('Status code must be an integer value.');
+        }
+    }
+
+    private function assertStatusCodeRange($statusCode)
+    {
+        if ($statusCode < 100 || $statusCode >= 600) {
+            throw new \InvalidArgumentException('Status code must be an integer value between 1xx and 5xx.');
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/Rfc7230.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+final class Rfc7230
+{
+    /**
+     * Header related regular expressions (copied from amphp/http package)
+     * (Note: once we require PHP 7.x we could just depend on the upstream package)
+     *
+     * Note: header delimiter (\r\n) is modified to \r?\n to accept line feed only delimiters for BC reasons.
+     *
+     * @link    https://github.com/amphp/http/blob/v1.0.1/src/Rfc7230.php#L12-L15
+     * @license https://github.com/amphp/http/blob/v1.0.1/LICENSE
+     */
+    const HEADER_REGEX = "(^([^()<>@,;:\\\"/[\]?={}\x01-\x20\x7F]++):[ \t]*+((?:[ \t]*+[\x21-\x7E\x80-\xFF]++)*+)[ \t]*+\r?\n)m";
+    const HEADER_FOLD_REGEX = "(\r?\n[ \t]++)";
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/ServerRequest.php

@@ -0,0 +1,376 @@
+<?php
+
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\UriInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UploadedFileInterface;
+
+/**
+ * Server-side HTTP request
+ *
+ * Extends the Request definition to add methods for accessing incoming data,
+ * specifically server parameters, cookies, matched path parameters, query
+ * string arguments, body parameters, and upload file information.
+ *
+ * "Attributes" are discovered via decomposing the request (and usually
+ * specifically the URI path), and typically will be injected by the application.
+ *
+ * Requests are considered immutable; all methods that might change state are
+ * implemented such that they retain the internal state of the current
+ * message and return a new instance that contains the changed state.
+ */
+class ServerRequest extends Request implements ServerRequestInterface
+{
+    /**
+     * @var array
+     */
+    private $attributes = [];
+
+    /**
+     * @var array
+     */
+    private $cookieParams = [];
+
+    /**
+     * @var null|array|object
+     */
+    private $parsedBody;
+
+    /**
+     * @var array
+     */
+    private $queryParams = [];
+
+    /**
+     * @var array
+     */
+    private $serverParams;
+
+    /**
+     * @var array
+     */
+    private $uploadedFiles = [];
+
+    /**
+     * @param string                               $method       HTTP method
+     * @param string|UriInterface                  $uri          URI
+     * @param array                                $headers      Request headers
+     * @param string|null|resource|StreamInterface $body         Request body
+     * @param string                               $version      Protocol version
+     * @param array                                $serverParams Typically the $_SERVER superglobal
+     */
+    public function __construct(
+        $method,
+        $uri,
+        array $headers = [],
+        $body = null,
+        $version = '1.1',
+        array $serverParams = []
+    ) {
+        $this->serverParams = $serverParams;
+
+        parent::__construct($method, $uri, $headers, $body, $version);
+    }
+
+    /**
+     * Return an UploadedFile instance array.
+     *
+     * @param array $files A array which respect $_FILES structure
+     * @throws InvalidArgumentException for unrecognized values
+     * @return array
+     */
+    public static function normalizeFiles(array $files)
+    {
+        $normalized = [];
+
+        foreach ($files as $key => $value) {
+            if ($value instanceof UploadedFileInterface) {
+                $normalized[$key] = $value;
+            } elseif (is_array($value) && isset($value['tmp_name'])) {
+                $normalized[$key] = self::createUploadedFileFromSpec($value);
+            } elseif (is_array($value)) {
+                $normalized[$key] = self::normalizeFiles($value);
+                continue;
+            } else {
+                throw new InvalidArgumentException('Invalid value in files specification');
+            }
+        }
+
+        return $normalized;
+    }
+
+    /**
+     * Create and return an UploadedFile instance from a $_FILES specification.
+     *
+     * If the specification represents an array of values, this method will
+     * delegate to normalizeNestedFileSpec() and return that return value.
+     *
+     * @param array $value $_FILES struct
+     * @return array|UploadedFileInterface
+     */
+    private static function createUploadedFileFromSpec(array $value)
+    {
+        if (is_array($value['tmp_name'])) {
+            return self::normalizeNestedFileSpec($value);
+        }
+
+        return new UploadedFile(
+            $value['tmp_name'],
+            (int) $value['size'],
+            (int) $value['error'],
+            $value['name'],
+            $value['type']
+        );
+    }
+
+    /**
+     * Normalize an array of file specifications.
+     *
+     * Loops through all nested files and returns a normalized array of
+     * UploadedFileInterface instances.
+     *
+     * @param array $files
+     * @return UploadedFileInterface[]
+     */
+    private static function normalizeNestedFileSpec(array $files = [])
+    {
+        $normalizedFiles = [];
+
+        foreach (array_keys($files['tmp_name']) as $key) {
+            $spec = [
+                'tmp_name' => $files['tmp_name'][$key],
+                'size'     => $files['size'][$key],
+                'error'    => $files['error'][$key],
+                'name'     => $files['name'][$key],
+                'type'     => $files['type'][$key],
+            ];
+            $normalizedFiles[$key] = self::createUploadedFileFromSpec($spec);
+        }
+
+        return $normalizedFiles;
+    }
+
+    /**
+     * Return a ServerRequest populated with superglobals:
+     * $_GET
+     * $_POST
+     * $_COOKIE
+     * $_FILES
+     * $_SERVER
+     *
+     * @return ServerRequestInterface
+     */
+    public static function fromGlobals()
+    {
+        $method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
+        $headers = getallheaders();
+        $uri = self::getUriFromGlobals();
+        $body = new CachingStream(new LazyOpenStream('php://input', 'r+'));
+        $protocol = isset($_SERVER['SERVER_PROTOCOL']) ? str_replace('HTTP/', '', $_SERVER['SERVER_PROTOCOL']) : '1.1';
+
+        $serverRequest = new ServerRequest($method, $uri, $headers, $body, $protocol, $_SERVER);
+
+        return $serverRequest
+            ->withCookieParams($_COOKIE)
+            ->withQueryParams($_GET)
+            ->withParsedBody($_POST)
+            ->withUploadedFiles(self::normalizeFiles($_FILES));
+    }
+
+    private static function extractHostAndPortFromAuthority($authority)
+    {
+        $uri = 'http://'.$authority;
+        $parts = parse_url($uri);
+        if (false === $parts) {
+            return [null, null];
+        }
+
+        $host = isset($parts['host']) ? $parts['host'] : null;
+        $port = isset($parts['port']) ? $parts['port'] : null;
+
+        return [$host, $port];
+    }
+
+    /**
+     * Get a Uri populated with values from $_SERVER.
+     *
+     * @return UriInterface
+     */
+    public static function getUriFromGlobals()
+    {
+        $uri = new Uri('');
+
+        $uri = $uri->withScheme(!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https' : 'http');
+
+        $hasPort = false;
+        if (isset($_SERVER['HTTP_HOST'])) {
+            list($host, $port) = self::extractHostAndPortFromAuthority($_SERVER['HTTP_HOST']);
+            if ($host !== null) {
+                $uri = $uri->withHost($host);
+            }
+
+            if ($port !== null) {
+                $hasPort = true;
+                $uri = $uri->withPort($port);
+            }
+        } elseif (isset($_SERVER['SERVER_NAME'])) {
+            $uri = $uri->withHost($_SERVER['SERVER_NAME']);
+        } elseif (isset($_SERVER['SERVER_ADDR'])) {
+            $uri = $uri->withHost($_SERVER['SERVER_ADDR']);
+        }
+
+        if (!$hasPort && isset($_SERVER['SERVER_PORT'])) {
+            $uri = $uri->withPort($_SERVER['SERVER_PORT']);
+        }
+
+        $hasQuery = false;
+        if (isset($_SERVER['REQUEST_URI'])) {
+            $requestUriParts = explode('?', $_SERVER['REQUEST_URI'], 2);
+            $uri = $uri->withPath($requestUriParts[0]);
+            if (isset($requestUriParts[1])) {
+                $hasQuery = true;
+                $uri = $uri->withQuery($requestUriParts[1]);
+            }
+        }
+
+        if (!$hasQuery && isset($_SERVER['QUERY_STRING'])) {
+            $uri = $uri->withQuery($_SERVER['QUERY_STRING']);
+        }
+
+        return $uri;
+    }
+
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getServerParams()
+    {
+        return $this->serverParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getUploadedFiles()
+    {
+        return $this->uploadedFiles;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withUploadedFiles(array $uploadedFiles)
+    {
+        $new = clone $this;
+        $new->uploadedFiles = $uploadedFiles;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCookieParams()
+    {
+        return $this->cookieParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withCookieParams(array $cookies)
+    {
+        $new = clone $this;
+        $new->cookieParams = $cookies;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getQueryParams()
+    {
+        return $this->queryParams;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withQueryParams(array $query)
+    {
+        $new = clone $this;
+        $new->queryParams = $query;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getParsedBody()
+    {
+        return $this->parsedBody;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withParsedBody($data)
+    {
+        $new = clone $this;
+        $new->parsedBody = $data;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAttributes()
+    {
+        return $this->attributes;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAttribute($attribute, $default = null)
+    {
+        if (false === array_key_exists($attribute, $this->attributes)) {
+            return $default;
+        }
+
+        return $this->attributes[$attribute];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withAttribute($attribute, $value)
+    {
+        $new = clone $this;
+        $new->attributes[$attribute] = $value;
+
+        return $new;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function withoutAttribute($attribute)
+    {
+        if (false === array_key_exists($attribute, $this->attributes)) {
+            return $this;
+        }
+
+        $new = clone $this;
+        unset($new->attributes[$attribute]);
+
+        return $new;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/Stream.php

@@ -0,0 +1,267 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * PHP stream implementation.
+ *
+ * @var $stream
+ */
+class Stream implements StreamInterface
+{
+    /**
+     * Resource modes.
+     *
+     * @var string
+     *
+     * @see http://php.net/manual/function.fopen.php
+     * @see http://php.net/manual/en/function.gzopen.php
+     */
+    const READABLE_MODES = '/r|a\+|ab\+|w\+|wb\+|x\+|xb\+|c\+|cb\+/';
+    const WRITABLE_MODES = '/a|w|r\+|rb\+|rw|x|c/';
+
+    private $stream;
+    private $size;
+    private $seekable;
+    private $readable;
+    private $writable;
+    private $uri;
+    private $customMetadata;
+
+    /**
+     * This constructor accepts an associative array of options.
+     *
+     * - size: (int) If a read stream would otherwise have an indeterminate
+     *   size, but the size is known due to foreknowledge, then you can
+     *   provide that size, in bytes.
+     * - metadata: (array) Any additional metadata to return when the metadata
+     *   of the stream is accessed.
+     *
+     * @param resource $stream  Stream resource to wrap.
+     * @param array    $options Associative array of options.
+     *
+     * @throws \InvalidArgumentException if the stream is not a stream resource
+     */
+    public function __construct($stream, $options = [])
+    {
+        if (!is_resource($stream)) {
+            throw new \InvalidArgumentException('Stream must be a resource');
+        }
+
+        if (isset($options['size'])) {
+            $this->size = $options['size'];
+        }
+
+        $this->customMetadata = isset($options['metadata'])
+            ? $options['metadata']
+            : [];
+
+        $this->stream = $stream;
+        $meta = stream_get_meta_data($this->stream);
+        $this->seekable = $meta['seekable'];
+        $this->readable = (bool)preg_match(self::READABLE_MODES, $meta['mode']);
+        $this->writable = (bool)preg_match(self::WRITABLE_MODES, $meta['mode']);
+        $this->uri = $this->getMetadata('uri');
+    }
+
+    /**
+     * Closes the stream when the destructed
+     */
+    public function __destruct()
+    {
+        $this->close();
+    }
+
+    public function __toString()
+    {
+        try {
+            $this->seek(0);
+            return (string) stream_get_contents($this->stream);
+        } catch (\Exception $e) {
+            return '';
+        }
+    }
+
+    public function getContents()
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+
+        $contents = stream_get_contents($this->stream);
+
+        if ($contents === false) {
+            throw new \RuntimeException('Unable to read stream contents');
+        }
+
+        return $contents;
+    }
+
+    public function close()
+    {
+        if (isset($this->stream)) {
+            if (is_resource($this->stream)) {
+                fclose($this->stream);
+            }
+            $this->detach();
+        }
+    }
+
+    public function detach()
+    {
+        if (!isset($this->stream)) {
+            return null;
+        }
+
+        $result = $this->stream;
+        unset($this->stream);
+        $this->size = $this->uri = null;
+        $this->readable = $this->writable = $this->seekable = false;
+
+        return $result;
+    }
+
+    public function getSize()
+    {
+        if ($this->size !== null) {
+            return $this->size;
+        }
+
+        if (!isset($this->stream)) {
+            return null;
+        }
+
+        // Clear the stat cache if the stream has a URI
+        if ($this->uri) {
+            clearstatcache(true, $this->uri);
+        }
+
+        $stats = fstat($this->stream);
+        if (isset($stats['size'])) {
+            $this->size = $stats['size'];
+            return $this->size;
+        }
+
+        return null;
+    }
+
+    public function isReadable()
+    {
+        return $this->readable;
+    }
+
+    public function isWritable()
+    {
+        return $this->writable;
+    }
+
+    public function isSeekable()
+    {
+        return $this->seekable;
+    }
+
+    public function eof()
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+
+        return feof($this->stream);
+    }
+
+    public function tell()
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+
+        $result = ftell($this->stream);
+
+        if ($result === false) {
+            throw new \RuntimeException('Unable to determine stream position');
+        }
+
+        return $result;
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        $whence = (int) $whence;
+        
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->seekable) {
+            throw new \RuntimeException('Stream is not seekable');
+        }
+        if (fseek($this->stream, $offset, $whence) === -1) {
+            throw new \RuntimeException('Unable to seek to stream position '
+                . $offset . ' with whence ' . var_export($whence, true));
+        }
+    }
+
+    public function read($length)
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->readable) {
+            throw new \RuntimeException('Cannot read from non-readable stream');
+        }
+        if ($length < 0) {
+            throw new \RuntimeException('Length parameter cannot be negative');
+        }
+
+        if (0 === $length) {
+            return '';
+        }
+
+        $string = fread($this->stream, $length);
+        if (false === $string) {
+            throw new \RuntimeException('Unable to read from stream');
+        }
+
+        return $string;
+    }
+
+    public function write($string)
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->writable) {
+            throw new \RuntimeException('Cannot write to a non-writable stream');
+        }
+
+        // We can't know the size after writing anything
+        $this->size = null;
+        $result = fwrite($this->stream, $string);
+
+        if ($result === false) {
+            throw new \RuntimeException('Unable to write to stream');
+        }
+
+        return $result;
+    }
+
+    public function getMetadata($key = null)
+    {
+        if (!isset($this->stream)) {
+            return $key ? null : [];
+        } elseif (!$key) {
+            return $this->customMetadata + stream_get_meta_data($this->stream);
+        } elseif (isset($this->customMetadata[$key])) {
+            return $this->customMetadata[$key];
+        }
+
+        $meta = stream_get_meta_data($this->stream);
+
+        return isset($meta[$key]) ? $meta[$key] : null;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/StreamDecoratorTrait.php

@@ -0,0 +1,149 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Stream decorator trait
+ * @property StreamInterface stream
+ */
+trait StreamDecoratorTrait
+{
+    /**
+     * @param StreamInterface $stream Stream to decorate
+     */
+    public function __construct(StreamInterface $stream)
+    {
+        $this->stream = $stream;
+    }
+
+    /**
+     * Magic method used to create a new stream if streams are not added in
+     * the constructor of a decorator (e.g., LazyOpenStream).
+     *
+     * @param string $name Name of the property (allows "stream" only).
+     *
+     * @return StreamInterface
+     */
+    public function __get($name)
+    {
+        if ($name == 'stream') {
+            $this->stream = $this->createStream();
+            return $this->stream;
+        }
+
+        throw new \UnexpectedValueException("$name not found on class");
+    }
+
+    public function __toString()
+    {
+        try {
+            if ($this->isSeekable()) {
+                $this->seek(0);
+            }
+            return $this->getContents();
+        } catch (\Exception $e) {
+            // Really, PHP? https://bugs.php.net/bug.php?id=53648
+            trigger_error('StreamDecorator::__toString exception: '
+                . (string) $e, E_USER_ERROR);
+            return '';
+        }
+    }
+
+    public function getContents()
+    {
+        return copy_to_string($this);
+    }
+
+    /**
+     * Allow decorators to implement custom methods
+     *
+     * @param string $method Missing method name
+     * @param array  $args   Method arguments
+     *
+     * @return mixed
+     */
+    public function __call($method, array $args)
+    {
+        $result = call_user_func_array([$this->stream, $method], $args);
+
+        // Always return the wrapped object if the result is a return $this
+        return $result === $this->stream ? $this : $result;
+    }
+
+    public function close()
+    {
+        $this->stream->close();
+    }
+
+    public function getMetadata($key = null)
+    {
+        return $this->stream->getMetadata($key);
+    }
+
+    public function detach()
+    {
+        return $this->stream->detach();
+    }
+
+    public function getSize()
+    {
+        return $this->stream->getSize();
+    }
+
+    public function eof()
+    {
+        return $this->stream->eof();
+    }
+
+    public function tell()
+    {
+        return $this->stream->tell();
+    }
+
+    public function isReadable()
+    {
+        return $this->stream->isReadable();
+    }
+
+    public function isWritable()
+    {
+        return $this->stream->isWritable();
+    }
+
+    public function isSeekable()
+    {
+        return $this->stream->isSeekable();
+    }
+
+    public function rewind()
+    {
+        $this->seek(0);
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+        $this->stream->seek($offset, $whence);
+    }
+
+    public function read($length)
+    {
+        return $this->stream->read($length);
+    }
+
+    public function write($string)
+    {
+        return $this->stream->write($string);
+    }
+
+    /**
+     * Implement in subclasses to dynamically create streams when requested.
+     *
+     * @return StreamInterface
+     * @throws \BadMethodCallException
+     */
+    protected function createStream()
+    {
+        throw new \BadMethodCallException('Not implemented');
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/StreamWrapper.php

@@ -0,0 +1,161 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Converts Guzzle streams into PHP stream resources.
+ */
+class StreamWrapper
+{
+    /** @var resource */
+    public $context;
+
+    /** @var StreamInterface */
+    private $stream;
+
+    /** @var string r, r+, or w */
+    private $mode;
+
+    /**
+     * Returns a resource representing the stream.
+     *
+     * @param StreamInterface $stream The stream to get a resource for
+     *
+     * @return resource
+     * @throws \InvalidArgumentException if stream is not readable or writable
+     */
+    public static function getResource(StreamInterface $stream)
+    {
+        self::register();
+
+        if ($stream->isReadable()) {
+            $mode = $stream->isWritable() ? 'r+' : 'r';
+        } elseif ($stream->isWritable()) {
+            $mode = 'w';
+        } else {
+            throw new \InvalidArgumentException('The stream must be readable, '
+                . 'writable, or both.');
+        }
+
+        return fopen('guzzle://stream', $mode, null, self::createStreamContext($stream));
+    }
+
+    /**
+     * Creates a stream context that can be used to open a stream as a php stream resource.
+     *
+     * @param StreamInterface $stream
+     *
+     * @return resource
+     */
+    public static function createStreamContext(StreamInterface $stream)
+    {
+        return stream_context_create([
+            'guzzle' => ['stream' => $stream]
+        ]);
+    }
+
+    /**
+     * Registers the stream wrapper if needed
+     */
+    public static function register()
+    {
+        if (!in_array('guzzle', stream_get_wrappers())) {
+            stream_wrapper_register('guzzle', __CLASS__);
+        }
+    }
+
+    public function stream_open($path, $mode, $options, &$opened_path)
+    {
+        $options = stream_context_get_options($this->context);
+
+        if (!isset($options['guzzle']['stream'])) {
+            return false;
+        }
+
+        $this->mode = $mode;
+        $this->stream = $options['guzzle']['stream'];
+
+        return true;
+    }
+
+    public function stream_read($count)
+    {
+        return $this->stream->read($count);
+    }
+
+    public function stream_write($data)
+    {
+        return (int) $this->stream->write($data);
+    }
+
+    public function stream_tell()
+    {
+        return $this->stream->tell();
+    }
+
+    public function stream_eof()
+    {
+        return $this->stream->eof();
+    }
+
+    public function stream_seek($offset, $whence)
+    {
+        $this->stream->seek($offset, $whence);
+
+        return true;
+    }
+
+    public function stream_cast($cast_as)
+    {
+        $stream = clone($this->stream);
+
+        return $stream->detach();
+    }
+
+    public function stream_stat()
+    {
+        static $modeMap = [
+            'r'  => 33060,
+            'rb' => 33060,
+            'r+' => 33206,
+            'w'  => 33188,
+            'wb' => 33188
+        ];
+
+        return [
+            'dev'     => 0,
+            'ino'     => 0,
+            'mode'    => $modeMap[$this->mode],
+            'nlink'   => 0,
+            'uid'     => 0,
+            'gid'     => 0,
+            'rdev'    => 0,
+            'size'    => $this->stream->getSize() ?: 0,
+            'atime'   => 0,
+            'mtime'   => 0,
+            'ctime'   => 0,
+            'blksize' => 0,
+            'blocks'  => 0
+        ];
+    }
+
+    public function url_stat($path, $flags)
+    {
+        return [
+            'dev'     => 0,
+            'ino'     => 0,
+            'mode'    => 0,
+            'nlink'   => 0,
+            'uid'     => 0,
+            'gid'     => 0,
+            'rdev'    => 0,
+            'size'    => 0,
+            'atime'   => 0,
+            'mtime'   => 0,
+            'ctime'   => 0,
+            'blksize' => 0,
+            'blocks'  => 0
+        ];
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/UploadedFile.php

@@ -0,0 +1,316 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UploadedFileInterface;
+use RuntimeException;
+
+class UploadedFile implements UploadedFileInterface
+{
+    /**
+     * @var int[]
+     */
+    private static $errors = [
+        UPLOAD_ERR_OK,
+        UPLOAD_ERR_INI_SIZE,
+        UPLOAD_ERR_FORM_SIZE,
+        UPLOAD_ERR_PARTIAL,
+        UPLOAD_ERR_NO_FILE,
+        UPLOAD_ERR_NO_TMP_DIR,
+        UPLOAD_ERR_CANT_WRITE,
+        UPLOAD_ERR_EXTENSION,
+    ];
+
+    /**
+     * @var string
+     */
+    private $clientFilename;
+
+    /**
+     * @var string
+     */
+    private $clientMediaType;
+
+    /**
+     * @var int
+     */
+    private $error;
+
+    /**
+     * @var null|string
+     */
+    private $file;
+
+    /**
+     * @var bool
+     */
+    private $moved = false;
+
+    /**
+     * @var int
+     */
+    private $size;
+
+    /**
+     * @var StreamInterface|null
+     */
+    private $stream;
+
+    /**
+     * @param StreamInterface|string|resource $streamOrFile
+     * @param int $size
+     * @param int $errorStatus
+     * @param string|null $clientFilename
+     * @param string|null $clientMediaType
+     */
+    public function __construct(
+        $streamOrFile,
+        $size,
+        $errorStatus,
+        $clientFilename = null,
+        $clientMediaType = null
+    ) {
+        $this->setError($errorStatus);
+        $this->setSize($size);
+        $this->setClientFilename($clientFilename);
+        $this->setClientMediaType($clientMediaType);
+
+        if ($this->isOk()) {
+            $this->setStreamOrFile($streamOrFile);
+        }
+    }
+
+    /**
+     * Depending on the value set file or stream variable
+     *
+     * @param mixed $streamOrFile
+     * @throws InvalidArgumentException
+     */
+    private function setStreamOrFile($streamOrFile)
+    {
+        if (is_string($streamOrFile)) {
+            $this->file = $streamOrFile;
+        } elseif (is_resource($streamOrFile)) {
+            $this->stream = new Stream($streamOrFile);
+        } elseif ($streamOrFile instanceof StreamInterface) {
+            $this->stream = $streamOrFile;
+        } else {
+            throw new InvalidArgumentException(
+                'Invalid stream or file provided for UploadedFile'
+            );
+        }
+    }
+
+    /**
+     * @param int $error
+     * @throws InvalidArgumentException
+     */
+    private function setError($error)
+    {
+        if (false === is_int($error)) {
+            throw new InvalidArgumentException(
+                'Upload file error status must be an integer'
+            );
+        }
+
+        if (false === in_array($error, UploadedFile::$errors)) {
+            throw new InvalidArgumentException(
+                'Invalid error status for UploadedFile'
+            );
+        }
+
+        $this->error = $error;
+    }
+
+    /**
+     * @param int $size
+     * @throws InvalidArgumentException
+     */
+    private function setSize($size)
+    {
+        if (false === is_int($size)) {
+            throw new InvalidArgumentException(
+                'Upload file size must be an integer'
+            );
+        }
+
+        $this->size = $size;
+    }
+
+    /**
+     * @param mixed $param
+     * @return boolean
+     */
+    private function isStringOrNull($param)
+    {
+        return in_array(gettype($param), ['string', 'NULL']);
+    }
+
+    /**
+     * @param mixed $param
+     * @return boolean
+     */
+    private function isStringNotEmpty($param)
+    {
+        return is_string($param) && false === empty($param);
+    }
+
+    /**
+     * @param string|null $clientFilename
+     * @throws InvalidArgumentException
+     */
+    private function setClientFilename($clientFilename)
+    {
+        if (false === $this->isStringOrNull($clientFilename)) {
+            throw new InvalidArgumentException(
+                'Upload file client filename must be a string or null'
+            );
+        }
+
+        $this->clientFilename = $clientFilename;
+    }
+
+    /**
+     * @param string|null $clientMediaType
+     * @throws InvalidArgumentException
+     */
+    private function setClientMediaType($clientMediaType)
+    {
+        if (false === $this->isStringOrNull($clientMediaType)) {
+            throw new InvalidArgumentException(
+                'Upload file client media type must be a string or null'
+            );
+        }
+
+        $this->clientMediaType = $clientMediaType;
+    }
+
+    /**
+     * Return true if there is no upload error
+     *
+     * @return boolean
+     */
+    private function isOk()
+    {
+        return $this->error === UPLOAD_ERR_OK;
+    }
+
+    /**
+     * @return boolean
+     */
+    public function isMoved()
+    {
+        return $this->moved;
+    }
+
+    /**
+     * @throws RuntimeException if is moved or not ok
+     */
+    private function validateActive()
+    {
+        if (false === $this->isOk()) {
+            throw new RuntimeException('Cannot retrieve stream due to upload error');
+        }
+
+        if ($this->isMoved()) {
+            throw new RuntimeException('Cannot retrieve stream after it has already been moved');
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     * @throws RuntimeException if the upload was not successful.
+     */
+    public function getStream()
+    {
+        $this->validateActive();
+
+        if ($this->stream instanceof StreamInterface) {
+            return $this->stream;
+        }
+
+        return new LazyOpenStream($this->file, 'r+');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see http://php.net/is_uploaded_file
+     * @see http://php.net/move_uploaded_file
+     * @param string $targetPath Path to which to move the uploaded file.
+     * @throws RuntimeException if the upload was not successful.
+     * @throws InvalidArgumentException if the $path specified is invalid.
+     * @throws RuntimeException on any error during the move operation, or on
+     *     the second or subsequent call to the method.
+     */
+    public function moveTo($targetPath)
+    {
+        $this->validateActive();
+
+        if (false === $this->isStringNotEmpty($targetPath)) {
+            throw new InvalidArgumentException(
+                'Invalid path provided for move operation; must be a non-empty string'
+            );
+        }
+
+        if ($this->file) {
+            $this->moved = php_sapi_name() == 'cli'
+                ? rename($this->file, $targetPath)
+                : move_uploaded_file($this->file, $targetPath);
+        } else {
+            copy_to_stream(
+                $this->getStream(),
+                new LazyOpenStream($targetPath, 'w')
+            );
+
+            $this->moved = true;
+        }
+
+        if (false === $this->moved) {
+            throw new RuntimeException(
+                sprintf('Uploaded file could not be moved to %s', $targetPath)
+            );
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return int|null The file size in bytes or null if unknown.
+     */
+    public function getSize()
+    {
+        return $this->size;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @see http://php.net/manual/en/features.file-upload.errors.php
+     * @return int One of PHP's UPLOAD_ERR_XXX constants.
+     */
+    public function getError()
+    {
+        return $this->error;
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return string|null The filename sent by the client or null if none
+     *     was provided.
+     */
+    public function getClientFilename()
+    {
+        return $this->clientFilename;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getClientMediaType()
+    {
+        return $this->clientMediaType;
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/Uri.php

@@ -0,0 +1,760 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * PSR-7 URI implementation.
+ *
+ * @author Michael Dowling
+ * @author Tobias Schultze
+ * @author Matthew Weier O'Phinney
+ */
+class Uri implements UriInterface
+{
+    /**
+     * Absolute http and https URIs require a host per RFC 7230 Section 2.7
+     * but in generic URIs the host can be empty. So for http(s) URIs
+     * we apply this default host when no host is given yet to form a
+     * valid URI.
+     */
+    const HTTP_DEFAULT_HOST = 'localhost';
+
+    private static $defaultPorts = [
+        'http'  => 80,
+        'https' => 443,
+        'ftp' => 21,
+        'gopher' => 70,
+        'nntp' => 119,
+        'news' => 119,
+        'telnet' => 23,
+        'tn3270' => 23,
+        'imap' => 143,
+        'pop' => 110,
+        'ldap' => 389,
+    ];
+
+    private static $charUnreserved = 'a-zA-Z0-9_\-\.~';
+    private static $charSubDelims = '!\$&\'\(\)\*\+,;=';
+    private static $replaceQuery = ['=' => '%3D', '&' => '%26'];
+
+    /** @var string Uri scheme. */
+    private $scheme = '';
+
+    /** @var string Uri user info. */
+    private $userInfo = '';
+
+    /** @var string Uri host. */
+    private $host = '';
+
+    /** @var int|null Uri port. */
+    private $port;
+
+    /** @var string Uri path. */
+    private $path = '';
+
+    /** @var string Uri query string. */
+    private $query = '';
+
+    /** @var string Uri fragment. */
+    private $fragment = '';
+
+    /**
+     * @param string $uri URI to parse
+     */
+    public function __construct($uri = '')
+    {
+        // weak type check to also accept null until we can add scalar type hints
+        if ($uri != '') {
+            $parts = parse_url($uri);
+            if ($parts === false) {
+                throw new \InvalidArgumentException("Unable to parse URI: $uri");
+            }
+            $this->applyParts($parts);
+        }
+    }
+
+    public function __toString()
+    {
+        return self::composeComponents(
+            $this->scheme,
+            $this->getAuthority(),
+            $this->path,
+            $this->query,
+            $this->fragment
+        );
+    }
+
+    /**
+     * Composes a URI reference string from its various components.
+     *
+     * Usually this method does not need to be called manually but instead is used indirectly via
+     * `Psr\Http\Message\UriInterface::__toString`.
+     *
+     * PSR-7 UriInterface treats an empty component the same as a missing component as
+     * getQuery(), getFragment() etc. always return a string. This explains the slight
+     * difference to RFC 3986 Section 5.3.
+     *
+     * Another adjustment is that the authority separator is added even when the authority is missing/empty
+     * for the "file" scheme. This is because PHP stream functions like `file_get_contents` only work with
+     * `file:///myfile` but not with `file:/myfile` although they are equivalent according to RFC 3986. But
+     * `file:///` is the more common syntax for the file scheme anyway (Chrome for example redirects to
+     * that format).
+     *
+     * @param string $scheme
+     * @param string $authority
+     * @param string $path
+     * @param string $query
+     * @param string $fragment
+     *
+     * @return string
+     *
+     * @link https://tools.ietf.org/html/rfc3986#section-5.3
+     */
+    public static function composeComponents($scheme, $authority, $path, $query, $fragment)
+    {
+        $uri = '';
+
+        // weak type checks to also accept null until we can add scalar type hints
+        if ($scheme != '') {
+            $uri .= $scheme . ':';
+        }
+
+        if ($authority != ''|| $scheme === 'file') {
+            $uri .= '//' . $authority;
+        }
+
+        $uri .= $path;
+
+        if ($query != '') {
+            $uri .= '?' . $query;
+        }
+
+        if ($fragment != '') {
+            $uri .= '#' . $fragment;
+        }
+
+        return $uri;
+    }
+
+    /**
+     * Whether the URI has the default port of the current scheme.
+     *
+     * `Psr\Http\Message\UriInterface::getPort` may return null or the standard port. This method can be used
+     * independently of the implementation.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     */
+    public static function isDefaultPort(UriInterface $uri)
+    {
+        return $uri->getPort() === null
+            || (isset(self::$defaultPorts[$uri->getScheme()]) && $uri->getPort() === self::$defaultPorts[$uri->getScheme()]);
+    }
+
+    /**
+     * Whether the URI is absolute, i.e. it has a scheme.
+     *
+     * An instance of UriInterface can either be an absolute URI or a relative reference. This method returns true
+     * if it is the former. An absolute URI has a scheme. A relative reference is used to express a URI relative
+     * to another URI, the base URI. Relative references can be divided into several forms:
+     * - network-path references, e.g. '//example.com/path'
+     * - absolute-path references, e.g. '/path'
+     * - relative-path references, e.g. 'subpath'
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @see Uri::isNetworkPathReference
+     * @see Uri::isAbsolutePathReference
+     * @see Uri::isRelativePathReference
+     * @link https://tools.ietf.org/html/rfc3986#section-4
+     */
+    public static function isAbsolute(UriInterface $uri)
+    {
+        return $uri->getScheme() !== '';
+    }
+
+    /**
+     * Whether the URI is a network-path reference.
+     *
+     * A relative reference that begins with two slash characters is termed an network-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isNetworkPathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === '' && $uri->getAuthority() !== '';
+    }
+
+    /**
+     * Whether the URI is a absolute-path reference.
+     *
+     * A relative reference that begins with a single slash character is termed an absolute-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isAbsolutePathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === ''
+            && $uri->getAuthority() === ''
+            && isset($uri->getPath()[0])
+            && $uri->getPath()[0] === '/';
+    }
+
+    /**
+     * Whether the URI is a relative-path reference.
+     *
+     * A relative reference that does not begin with a slash character is termed a relative-path reference.
+     *
+     * @param UriInterface $uri
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isRelativePathReference(UriInterface $uri)
+    {
+        return $uri->getScheme() === ''
+            && $uri->getAuthority() === ''
+            && (!isset($uri->getPath()[0]) || $uri->getPath()[0] !== '/');
+    }
+
+    /**
+     * Whether the URI is a same-document reference.
+     *
+     * A same-document reference refers to a URI that is, aside from its fragment
+     * component, identical to the base URI. When no base URI is given, only an empty
+     * URI reference (apart from its fragment) is considered a same-document reference.
+     *
+     * @param UriInterface      $uri  The URI to check
+     * @param UriInterface|null $base An optional base URI to compare against
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-4.4
+     */
+    public static function isSameDocumentReference(UriInterface $uri, UriInterface $base = null)
+    {
+        if ($base !== null) {
+            $uri = UriResolver::resolve($base, $uri);
+
+            return ($uri->getScheme() === $base->getScheme())
+                && ($uri->getAuthority() === $base->getAuthority())
+                && ($uri->getPath() === $base->getPath())
+                && ($uri->getQuery() === $base->getQuery());
+        }
+
+        return $uri->getScheme() === '' && $uri->getAuthority() === '' && $uri->getPath() === '' && $uri->getQuery() === '';
+    }
+
+    /**
+     * Removes dot segments from a path and returns the new path.
+     *
+     * @param string $path
+     *
+     * @return string
+     *
+     * @deprecated since version 1.4. Use UriResolver::removeDotSegments instead.
+     * @see UriResolver::removeDotSegments
+     */
+    public static function removeDotSegments($path)
+    {
+        return UriResolver::removeDotSegments($path);
+    }
+
+    /**
+     * Converts the relative URI into a new URI that is resolved against the base URI.
+     *
+     * @param UriInterface        $base Base URI
+     * @param string|UriInterface $rel  Relative URI
+     *
+     * @return UriInterface
+     *
+     * @deprecated since version 1.4. Use UriResolver::resolve instead.
+     * @see UriResolver::resolve
+     */
+    public static function resolve(UriInterface $base, $rel)
+    {
+        if (!($rel instanceof UriInterface)) {
+            $rel = new self($rel);
+        }
+
+        return UriResolver::resolve($base, $rel);
+    }
+
+    /**
+     * Creates a new URI with a specific query string value removed.
+     *
+     * Any existing query string values that exactly match the provided key are
+     * removed.
+     *
+     * @param UriInterface $uri URI to use as a base.
+     * @param string       $key Query string key to remove.
+     *
+     * @return UriInterface
+     */
+    public static function withoutQueryValue(UriInterface $uri, $key)
+    {
+        $result = self::getFilteredQueryString($uri, [$key]);
+
+        return $uri->withQuery(implode('&', $result));
+    }
+
+    /**
+     * Creates a new URI with a specific query string value.
+     *
+     * Any existing query string values that exactly match the provided key are
+     * removed and replaced with the given key value pair.
+     *
+     * A value of null will set the query string key without a value, e.g. "key"
+     * instead of "key=value".
+     *
+     * @param UriInterface $uri   URI to use as a base.
+     * @param string       $key   Key to set.
+     * @param string|null  $value Value to set
+     *
+     * @return UriInterface
+     */
+    public static function withQueryValue(UriInterface $uri, $key, $value)
+    {
+        $result = self::getFilteredQueryString($uri, [$key]);
+
+        $result[] = self::generateQueryString($key, $value);
+
+        return $uri->withQuery(implode('&', $result));
+    }
+
+    /**
+     * Creates a new URI with multiple specific query string values.
+     *
+     * It has the same behavior as withQueryValue() but for an associative array of key => value.
+     *
+     * @param UriInterface $uri           URI to use as a base.
+     * @param array        $keyValueArray Associative array of key and values
+     *
+     * @return UriInterface
+     */
+    public static function withQueryValues(UriInterface $uri, array $keyValueArray)
+    {
+        $result = self::getFilteredQueryString($uri, array_keys($keyValueArray));
+
+        foreach ($keyValueArray as $key => $value) {
+            $result[] = self::generateQueryString($key, $value);
+        }
+
+        return $uri->withQuery(implode('&', $result));
+    }
+
+    /**
+     * Creates a URI from a hash of `parse_url` components.
+     *
+     * @param array $parts
+     *
+     * @return UriInterface
+     * @link http://php.net/manual/en/function.parse-url.php
+     *
+     * @throws \InvalidArgumentException If the components do not form a valid URI.
+     */
+    public static function fromParts(array $parts)
+    {
+        $uri = new self();
+        $uri->applyParts($parts);
+        $uri->validateState();
+
+        return $uri;
+    }
+
+    public function getScheme()
+    {
+        return $this->scheme;
+    }
+
+    public function getAuthority()
+    {
+        $authority = $this->host;
+        if ($this->userInfo !== '') {
+            $authority = $this->userInfo . '@' . $authority;
+        }
+
+        if ($this->port !== null) {
+            $authority .= ':' . $this->port;
+        }
+
+        return $authority;
+    }
+
+    public function getUserInfo()
+    {
+        return $this->userInfo;
+    }
+
+    public function getHost()
+    {
+        return $this->host;
+    }
+
+    public function getPort()
+    {
+        return $this->port;
+    }
+
+    public function getPath()
+    {
+        return $this->path;
+    }
+
+    public function getQuery()
+    {
+        return $this->query;
+    }
+
+    public function getFragment()
+    {
+        return $this->fragment;
+    }
+
+    public function withScheme($scheme)
+    {
+        $scheme = $this->filterScheme($scheme);
+
+        if ($this->scheme === $scheme) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->scheme = $scheme;
+        $new->removeDefaultPort();
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withUserInfo($user, $password = null)
+    {
+        $info = $this->filterUserInfoComponent($user);
+        if ($password !== null) {
+            $info .= ':' . $this->filterUserInfoComponent($password);
+        }
+
+        if ($this->userInfo === $info) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->userInfo = $info;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withHost($host)
+    {
+        $host = $this->filterHost($host);
+
+        if ($this->host === $host) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->host = $host;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withPort($port)
+    {
+        $port = $this->filterPort($port);
+
+        if ($this->port === $port) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->port = $port;
+        $new->removeDefaultPort();
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withPath($path)
+    {
+        $path = $this->filterPath($path);
+
+        if ($this->path === $path) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->path = $path;
+        $new->validateState();
+
+        return $new;
+    }
+
+    public function withQuery($query)
+    {
+        $query = $this->filterQueryAndFragment($query);
+
+        if ($this->query === $query) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->query = $query;
+
+        return $new;
+    }
+
+    public function withFragment($fragment)
+    {
+        $fragment = $this->filterQueryAndFragment($fragment);
+
+        if ($this->fragment === $fragment) {
+            return $this;
+        }
+
+        $new = clone $this;
+        $new->fragment = $fragment;
+
+        return $new;
+    }
+
+    /**
+     * Apply parse_url parts to a URI.
+     *
+     * @param array $parts Array of parse_url parts to apply.
+     */
+    private function applyParts(array $parts)
+    {
+        $this->scheme = isset($parts['scheme'])
+            ? $this->filterScheme($parts['scheme'])
+            : '';
+        $this->userInfo = isset($parts['user'])
+            ? $this->filterUserInfoComponent($parts['user'])
+            : '';
+        $this->host = isset($parts['host'])
+            ? $this->filterHost($parts['host'])
+            : '';
+        $this->port = isset($parts['port'])
+            ? $this->filterPort($parts['port'])
+            : null;
+        $this->path = isset($parts['path'])
+            ? $this->filterPath($parts['path'])
+            : '';
+        $this->query = isset($parts['query'])
+            ? $this->filterQueryAndFragment($parts['query'])
+            : '';
+        $this->fragment = isset($parts['fragment'])
+            ? $this->filterQueryAndFragment($parts['fragment'])
+            : '';
+        if (isset($parts['pass'])) {
+            $this->userInfo .= ':' . $this->filterUserInfoComponent($parts['pass']);
+        }
+
+        $this->removeDefaultPort();
+    }
+
+    /**
+     * @param string $scheme
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the scheme is invalid.
+     */
+    private function filterScheme($scheme)
+    {
+        if (!is_string($scheme)) {
+            throw new \InvalidArgumentException('Scheme must be a string');
+        }
+
+        return strtolower($scheme);
+    }
+
+    /**
+     * @param string $component
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the user info is invalid.
+     */
+    private function filterUserInfoComponent($component)
+    {
+        if (!is_string($component)) {
+            throw new \InvalidArgumentException('User info must be a string');
+        }
+
+        return preg_replace_callback(
+            '/(?:[^%' . self::$charUnreserved . self::$charSubDelims . ']+|%(?![A-Fa-f0-9]{2}))/',
+            [$this, 'rawurlencodeMatchZero'],
+            $component
+        );
+    }
+
+    /**
+     * @param string $host
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the host is invalid.
+     */
+    private function filterHost($host)
+    {
+        if (!is_string($host)) {
+            throw new \InvalidArgumentException('Host must be a string');
+        }
+
+        return strtolower($host);
+    }
+
+    /**
+     * @param int|null $port
+     *
+     * @return int|null
+     *
+     * @throws \InvalidArgumentException If the port is invalid.
+     */
+    private function filterPort($port)
+    {
+        if ($port === null) {
+            return null;
+        }
+
+        $port = (int) $port;
+        if (0 > $port || 0xffff < $port) {
+            throw new \InvalidArgumentException(
+                sprintf('Invalid port: %d. Must be between 0 and 65535', $port)
+            );
+        }
+
+        return $port;
+    }
+
+    /**
+     * @param UriInterface $uri
+     * @param array        $keys
+     * 
+     * @return array
+     */
+    private static function getFilteredQueryString(UriInterface $uri, array $keys)
+    {
+        $current = $uri->getQuery();
+
+        if ($current === '') {
+            return [];
+        }
+
+        $decodedKeys = array_map('rawurldecode', $keys);
+
+        return array_filter(explode('&', $current), function ($part) use ($decodedKeys) {
+            return !in_array(rawurldecode(explode('=', $part)[0]), $decodedKeys, true);
+        });
+    }
+
+    /**
+     * @param string      $key
+     * @param string|null $value
+     * 
+     * @return string
+     */
+    private static function generateQueryString($key, $value)
+    {
+        // Query string separators ("=", "&") within the key or value need to be encoded
+        // (while preventing double-encoding) before setting the query string. All other
+        // chars that need percent-encoding will be encoded by withQuery().
+        $queryString = strtr($key, self::$replaceQuery);
+
+        if ($value !== null) {
+            $queryString .= '=' . strtr($value, self::$replaceQuery);
+        }
+
+        return $queryString;
+    }
+
+    private function removeDefaultPort()
+    {
+        if ($this->port !== null && self::isDefaultPort($this)) {
+            $this->port = null;
+        }
+    }
+
+    /**
+     * Filters the path of a URI
+     *
+     * @param string $path
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the path is invalid.
+     */
+    private function filterPath($path)
+    {
+        if (!is_string($path)) {
+            throw new \InvalidArgumentException('Path must be a string');
+        }
+
+        return preg_replace_callback(
+            '/(?:[^' . self::$charUnreserved . self::$charSubDelims . '%:@\/]++|%(?![A-Fa-f0-9]{2}))/',
+            [$this, 'rawurlencodeMatchZero'],
+            $path
+        );
+    }
+
+    /**
+     * Filters the query string or fragment of a URI.
+     *
+     * @param string $str
+     *
+     * @return string
+     *
+     * @throws \InvalidArgumentException If the query or fragment is invalid.
+     */
+    private function filterQueryAndFragment($str)
+    {
+        if (!is_string($str)) {
+            throw new \InvalidArgumentException('Query and fragment must be a string');
+        }
+
+        return preg_replace_callback(
+            '/(?:[^' . self::$charUnreserved . self::$charSubDelims . '%:@\/\?]++|%(?![A-Fa-f0-9]{2}))/',
+            [$this, 'rawurlencodeMatchZero'],
+            $str
+        );
+    }
+
+    private function rawurlencodeMatchZero(array $match)
+    {
+        return rawurlencode($match[0]);
+    }
+
+    private function validateState()
+    {
+        if ($this->host === '' && ($this->scheme === 'http' || $this->scheme === 'https')) {
+            $this->host = self::HTTP_DEFAULT_HOST;
+        }
+
+        if ($this->getAuthority() === '') {
+            if (0 === strpos($this->path, '//')) {
+                throw new \InvalidArgumentException('The path of a URI without an authority must not start with two slashes "//"');
+            }
+            if ($this->scheme === '' && false !== strpos(explode('/', $this->path, 2)[0], ':')) {
+                throw new \InvalidArgumentException('A relative URI must not have a path beginning with a segment containing a colon');
+            }
+        } elseif (isset($this->path[0]) && $this->path[0] !== '/') {
+            @trigger_error(
+                'The path of a URI with an authority must start with a slash "/" or be empty. Automagically fixing the URI ' .
+                'by adding a leading slash to the path is deprecated since version 1.4 and will throw an exception instead.',
+                E_USER_DEPRECATED
+            );
+            $this->path = '/'. $this->path;
+            //throw new \InvalidArgumentException('The path of a URI with an authority must start with a slash "/" or be empty');
+        }
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/UriNormalizer.php

@@ -0,0 +1,216 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Provides methods to normalize and compare URIs.
+ *
+ * @author Tobias Schultze
+ *
+ * @link https://tools.ietf.org/html/rfc3986#section-6
+ */
+final class UriNormalizer
+{
+    /**
+     * Default normalizations which only include the ones that preserve semantics.
+     *
+     * self::CAPITALIZE_PERCENT_ENCODING | self::DECODE_UNRESERVED_CHARACTERS | self::CONVERT_EMPTY_PATH |
+     * self::REMOVE_DEFAULT_HOST | self::REMOVE_DEFAULT_PORT | self::REMOVE_DOT_SEGMENTS
+     */
+    const PRESERVING_NORMALIZATIONS = 63;
+
+    /**
+     * All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
+     *
+     * Example: http://example.org/a%c2%b1b → http://example.org/a%C2%B1b
+     */
+    const CAPITALIZE_PERCENT_ENCODING = 1;
+
+    /**
+     * Decodes percent-encoded octets of unreserved characters.
+     *
+     * For consistency, percent-encoded octets in the ranges of ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39),
+     * hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should not be created by URI producers and,
+     * when found in a URI, should be decoded to their corresponding unreserved characters by URI normalizers.
+     *
+     * Example: http://example.org/%7Eusern%61me/ → http://example.org/~username/
+     */
+    const DECODE_UNRESERVED_CHARACTERS = 2;
+
+    /**
+     * Converts the empty path to "/" for http and https URIs.
+     *
+     * Example: http://example.org → http://example.org/
+     */
+    const CONVERT_EMPTY_PATH = 4;
+
+    /**
+     * Removes the default host of the given URI scheme from the URI.
+     *
+     * Only the "file" scheme defines the default host "localhost".
+     * All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile`
+     * are equivalent according to RFC 3986. The first format is not accepted
+     * by PHPs stream functions and thus already normalized implicitly to the
+     * second format in the Uri class. See `GuzzleHttp\Psr7\Uri::composeComponents`.
+     *
+     * Example: file://localhost/myfile → file:///myfile
+     */
+    const REMOVE_DEFAULT_HOST = 8;
+
+    /**
+     * Removes the default port of the given URI scheme from the URI.
+     *
+     * Example: http://example.org:80/ → http://example.org/
+     */
+    const REMOVE_DEFAULT_PORT = 16;
+
+    /**
+     * Removes unnecessary dot-segments.
+     *
+     * Dot-segments in relative-path references are not removed as it would
+     * change the semantics of the URI reference.
+     *
+     * Example: http://example.org/../a/b/../c/./d.html → http://example.org/a/c/d.html
+     */
+    const REMOVE_DOT_SEGMENTS = 32;
+
+    /**
+     * Paths which include two or more adjacent slashes are converted to one.
+     *
+     * Webservers usually ignore duplicate slashes and treat those URIs equivalent.
+     * But in theory those URIs do not need to be equivalent. So this normalization
+     * may change the semantics. Encoded slashes (%2F) are not removed.
+     *
+     * Example: http://example.org//foo///bar.html → http://example.org/foo/bar.html
+     */
+    const REMOVE_DUPLICATE_SLASHES = 64;
+
+    /**
+     * Sort query parameters with their values in alphabetical order.
+     *
+     * However, the order of parameters in a URI may be significant (this is not defined by the standard).
+     * So this normalization is not safe and may change the semantics of the URI.
+     *
+     * Example: ?lang=en&article=fred → ?article=fred&lang=en
+     *
+     * Note: The sorting is neither locale nor Unicode aware (the URI query does not get decoded at all) as the
+     * purpose is to be able to compare URIs in a reproducible way, not to have the params sorted perfectly.
+     */
+    const SORT_QUERY_PARAMETERS = 128;
+
+    /**
+     * Returns a normalized URI.
+     *
+     * The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
+     * This methods adds additional normalizations that can be configured with the $flags parameter.
+     *
+     * PSR-7 UriInterface cannot distinguish between an empty component and a missing component as
+     * getQuery(), getFragment() etc. always return a string. This means the URIs "/?#" and "/" are
+     * treated equivalent which is not necessarily true according to RFC 3986. But that difference
+     * is highly uncommon in reality. So this potential normalization is implied in PSR-7 as well.
+     *
+     * @param UriInterface $uri   The URI to normalize
+     * @param int          $flags A bitmask of normalizations to apply, see constants
+     *
+     * @return UriInterface The normalized URI
+     * @link https://tools.ietf.org/html/rfc3986#section-6.2
+     */
+    public static function normalize(UriInterface $uri, $flags = self::PRESERVING_NORMALIZATIONS)
+    {
+        if ($flags & self::CAPITALIZE_PERCENT_ENCODING) {
+            $uri = self::capitalizePercentEncoding($uri);
+        }
+
+        if ($flags & self::DECODE_UNRESERVED_CHARACTERS) {
+            $uri = self::decodeUnreservedCharacters($uri);
+        }
+
+        if ($flags & self::CONVERT_EMPTY_PATH && $uri->getPath() === '' &&
+            ($uri->getScheme() === 'http' || $uri->getScheme() === 'https')
+        ) {
+            $uri = $uri->withPath('/');
+        }
+
+        if ($flags & self::REMOVE_DEFAULT_HOST && $uri->getScheme() === 'file' && $uri->getHost() === 'localhost') {
+            $uri = $uri->withHost('');
+        }
+
+        if ($flags & self::REMOVE_DEFAULT_PORT && $uri->getPort() !== null && Uri::isDefaultPort($uri)) {
+            $uri = $uri->withPort(null);
+        }
+
+        if ($flags & self::REMOVE_DOT_SEGMENTS && !Uri::isRelativePathReference($uri)) {
+            $uri = $uri->withPath(UriResolver::removeDotSegments($uri->getPath()));
+        }
+
+        if ($flags & self::REMOVE_DUPLICATE_SLASHES) {
+            $uri = $uri->withPath(preg_replace('#//++#', '/', $uri->getPath()));
+        }
+
+        if ($flags & self::SORT_QUERY_PARAMETERS && $uri->getQuery() !== '') {
+            $queryKeyValues = explode('&', $uri->getQuery());
+            sort($queryKeyValues);
+            $uri = $uri->withQuery(implode('&', $queryKeyValues));
+        }
+
+        return $uri;
+    }
+
+    /**
+     * Whether two URIs can be considered equivalent.
+     *
+     * Both URIs are normalized automatically before comparison with the given $normalizations bitmask. The method also
+     * accepts relative URI references and returns true when they are equivalent. This of course assumes they will be
+     * resolved against the same base URI. If this is not the case, determination of equivalence or difference of
+     * relative references does not mean anything.
+     *
+     * @param UriInterface $uri1           An URI to compare
+     * @param UriInterface $uri2           An URI to compare
+     * @param int          $normalizations A bitmask of normalizations to apply, see constants
+     *
+     * @return bool
+     * @link https://tools.ietf.org/html/rfc3986#section-6.1
+     */
+    public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, $normalizations = self::PRESERVING_NORMALIZATIONS)
+    {
+        return (string) self::normalize($uri1, $normalizations) === (string) self::normalize($uri2, $normalizations);
+    }
+
+    private static function capitalizePercentEncoding(UriInterface $uri)
+    {
+        $regex = '/(?:%[A-Fa-f0-9]{2})++/';
+
+        $callback = function (array $match) {
+            return strtoupper($match[0]);
+        };
+
+        return
+            $uri->withPath(
+                preg_replace_callback($regex, $callback, $uri->getPath())
+            )->withQuery(
+                preg_replace_callback($regex, $callback, $uri->getQuery())
+            );
+    }
+
+    private static function decodeUnreservedCharacters(UriInterface $uri)
+    {
+        $regex = '/%(?:2D|2E|5F|7E|3[0-9]|[46][1-9A-F]|[57][0-9A])/i';
+
+        $callback = function (array $match) {
+            return rawurldecode($match[0]);
+        };
+
+        return
+            $uri->withPath(
+                preg_replace_callback($regex, $callback, $uri->getPath())
+            )->withQuery(
+                preg_replace_callback($regex, $callback, $uri->getQuery())
+            );
+    }
+
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/UriResolver.php

@@ -0,0 +1,219 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Resolves a URI reference in the context of a base URI and the opposite way.
+ *
+ * @author Tobias Schultze
+ *
+ * @link https://tools.ietf.org/html/rfc3986#section-5
+ */
+final class UriResolver
+{
+    /**
+     * Removes dot segments from a path and returns the new path.
+     *
+     * @param string $path
+     *
+     * @return string
+     * @link http://tools.ietf.org/html/rfc3986#section-5.2.4
+     */
+    public static function removeDotSegments($path)
+    {
+        if ($path === '' || $path === '/') {
+            return $path;
+        }
+
+        $results = [];
+        $segments = explode('/', $path);
+        foreach ($segments as $segment) {
+            if ($segment === '..') {
+                array_pop($results);
+            } elseif ($segment !== '.') {
+                $results[] = $segment;
+            }
+        }
+
+        $newPath = implode('/', $results);
+
+        if ($path[0] === '/' && (!isset($newPath[0]) || $newPath[0] !== '/')) {
+            // Re-add the leading slash if necessary for cases like "/.."
+            $newPath = '/' . $newPath;
+        } elseif ($newPath !== '' && ($segment === '.' || $segment === '..')) {
+            // Add the trailing slash if necessary
+            // If newPath is not empty, then $segment must be set and is the last segment from the foreach
+            $newPath .= '/';
+        }
+
+        return $newPath;
+    }
+
+    /**
+     * Converts the relative URI into a new URI that is resolved against the base URI.
+     *
+     * @param UriInterface $base Base URI
+     * @param UriInterface $rel  Relative URI
+     *
+     * @return UriInterface
+     * @link http://tools.ietf.org/html/rfc3986#section-5.2
+     */
+    public static function resolve(UriInterface $base, UriInterface $rel)
+    {
+        if ((string) $rel === '') {
+            // we can simply return the same base URI instance for this same-document reference
+            return $base;
+        }
+
+        if ($rel->getScheme() != '') {
+            return $rel->withPath(self::removeDotSegments($rel->getPath()));
+        }
+
+        if ($rel->getAuthority() != '') {
+            $targetAuthority = $rel->getAuthority();
+            $targetPath = self::removeDotSegments($rel->getPath());
+            $targetQuery = $rel->getQuery();
+        } else {
+            $targetAuthority = $base->getAuthority();
+            if ($rel->getPath() === '') {
+                $targetPath = $base->getPath();
+                $targetQuery = $rel->getQuery() != '' ? $rel->getQuery() : $base->getQuery();
+            } else {
+                if ($rel->getPath()[0] === '/') {
+                    $targetPath = $rel->getPath();
+                } else {
+                    if ($targetAuthority != '' && $base->getPath() === '') {
+                        $targetPath = '/' . $rel->getPath();
+                    } else {
+                        $lastSlashPos = strrpos($base->getPath(), '/');
+                        if ($lastSlashPos === false) {
+                            $targetPath = $rel->getPath();
+                        } else {
+                            $targetPath = substr($base->getPath(), 0, $lastSlashPos + 1) . $rel->getPath();
+                        }
+                    }
+                }
+                $targetPath = self::removeDotSegments($targetPath);
+                $targetQuery = $rel->getQuery();
+            }
+        }
+
+        return new Uri(Uri::composeComponents(
+            $base->getScheme(),
+            $targetAuthority,
+            $targetPath,
+            $targetQuery,
+            $rel->getFragment()
+        ));
+    }
+
+    /**
+     * Returns the target URI as a relative reference from the base URI.
+     *
+     * This method is the counterpart to resolve():
+     *
+     *    (string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
+     *
+     * One use-case is to use the current request URI as base URI and then generate relative links in your documents
+     * to reduce the document size or offer self-contained downloadable document archives.
+     *
+     *    $base = new Uri('http://example.com/a/b/');
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c'));  // prints 'c'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y'));  // prints '../x/y'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.org/a/b/'));   // prints '//example.org/a/b/'.
+     *
+     * This method also accepts a target that is already relative and will try to relativize it further. Only a
+     * relative-path reference will be returned as-is.
+     *
+     *    echo UriResolver::relativize($base, new Uri('/a/b/c'));  // prints 'c' as well
+     *
+     * @param UriInterface $base   Base URI
+     * @param UriInterface $target Target URI
+     *
+     * @return UriInterface The relative URI reference
+     */
+    public static function relativize(UriInterface $base, UriInterface $target)
+    {
+        if ($target->getScheme() !== '' &&
+            ($base->getScheme() !== $target->getScheme() || $target->getAuthority() === '' && $base->getAuthority() !== '')
+        ) {
+            return $target;
+        }
+
+        if (Uri::isRelativePathReference($target)) {
+            // As the target is already highly relative we return it as-is. It would be possible to resolve
+            // the target with `$target = self::resolve($base, $target);` and then try make it more relative
+            // by removing a duplicate query. But let's not do that automatically.
+            return $target;
+        }
+
+        if ($target->getAuthority() !== '' && $base->getAuthority() !== $target->getAuthority()) {
+            return $target->withScheme('');
+        }
+
+        // We must remove the path before removing the authority because if the path starts with two slashes, the URI
+        // would turn invalid. And we also cannot set a relative path before removing the authority, as that is also
+        // invalid.
+        $emptyPathUri = $target->withScheme('')->withPath('')->withUserInfo('')->withPort(null)->withHost('');
+
+        if ($base->getPath() !== $target->getPath()) {
+            return $emptyPathUri->withPath(self::getRelativePath($base, $target));
+        }
+
+        if ($base->getQuery() === $target->getQuery()) {
+            // Only the target fragment is left. And it must be returned even if base and target fragment are the same.
+            return $emptyPathUri->withQuery('');
+        }
+
+        // If the base URI has a query but the target has none, we cannot return an empty path reference as it would
+        // inherit the base query component when resolving.
+        if ($target->getQuery() === '') {
+            $segments = explode('/', $target->getPath());
+            $lastSegment = end($segments);
+
+            return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
+        }
+
+        return $emptyPathUri;
+    }
+
+    private static function getRelativePath(UriInterface $base, UriInterface $target)
+    {
+        $sourceSegments = explode('/', $base->getPath());
+        $targetSegments = explode('/', $target->getPath());
+        array_pop($sourceSegments);
+        $targetLastSegment = array_pop($targetSegments);
+        foreach ($sourceSegments as $i => $segment) {
+            if (isset($targetSegments[$i]) && $segment === $targetSegments[$i]) {
+                unset($sourceSegments[$i], $targetSegments[$i]);
+            } else {
+                break;
+            }
+        }
+        $targetSegments[] = $targetLastSegment;
+        $relativePath = str_repeat('../', count($sourceSegments)) . implode('/', $targetSegments);
+
+        // A reference to am empty last segment or an empty first sub-segment must be prefixed with "./".
+        // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
+        // as the first segment of a relative-path reference, as it would be mistaken for a scheme name.
+        if ('' === $relativePath || false !== strpos(explode('/', $relativePath, 2)[0], ':')) {
+            $relativePath = "./$relativePath";
+        } elseif ('/' === $relativePath[0]) {
+            if ($base->getAuthority() != '' && $base->getPath() === '') {
+                // In this case an extra slash is added by resolve() automatically. So we must not add one here.
+                $relativePath = ".$relativePath";
+            } else {
+                $relativePath = "./$relativePath";
+            }
+        }
+
+        return $relativePath;
+    }
+
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/functions.php

@@ -0,0 +1,899 @@
+<?php
+namespace GuzzleHttp\Psr7;
+
+use Psr\Http\Message\MessageInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\StreamInterface;
+use Psr\Http\Message\UriInterface;
+
+/**
+ * Returns the string representation of an HTTP message.
+ *
+ * @param MessageInterface $message Message to convert to a string.
+ *
+ * @return string
+ */
+function str(MessageInterface $message)
+{
+    if ($message instanceof RequestInterface) {
+        $msg = trim($message->getMethod() . ' '
+                . $message->getRequestTarget())
+            . ' HTTP/' . $message->getProtocolVersion();
+        if (!$message->hasHeader('host')) {
+            $msg .= "\r\nHost: " . $message->getUri()->getHost();
+        }
+    } elseif ($message instanceof ResponseInterface) {
+        $msg = 'HTTP/' . $message->getProtocolVersion() . ' '
+            . $message->getStatusCode() . ' '
+            . $message->getReasonPhrase();
+    } else {
+        throw new \InvalidArgumentException('Unknown message type');
+    }
+
+    foreach ($message->getHeaders() as $name => $values) {
+        $msg .= "\r\n{$name}: " . implode(', ', $values);
+    }
+
+    return "{$msg}\r\n\r\n" . $message->getBody();
+}
+
+/**
+ * Returns a UriInterface for the given value.
+ *
+ * This function accepts a string or {@see Psr\Http\Message\UriInterface} and
+ * returns a UriInterface for the given value. If the value is already a
+ * `UriInterface`, it is returned as-is.
+ *
+ * @param string|UriInterface $uri
+ *
+ * @return UriInterface
+ * @throws \InvalidArgumentException
+ */
+function uri_for($uri)
+{
+    if ($uri instanceof UriInterface) {
+        return $uri;
+    } elseif (is_string($uri)) {
+        return new Uri($uri);
+    }
+
+    throw new \InvalidArgumentException('URI must be a string or UriInterface');
+}
+
+/**
+ * Create a new stream based on the input type.
+ *
+ * Options is an associative array that can contain the following keys:
+ * - metadata: Array of custom metadata.
+ * - size: Size of the stream.
+ *
+ * @param resource|string|null|int|float|bool|StreamInterface|callable|\Iterator $resource Entity body data
+ * @param array                                                                  $options  Additional options
+ *
+ * @return StreamInterface
+ * @throws \InvalidArgumentException if the $resource arg is not valid.
+ */
+function stream_for($resource = '', array $options = [])
+{
+    if (is_scalar($resource)) {
+        $stream = fopen('php://temp', 'r+');
+        if ($resource !== '') {
+            fwrite($stream, $resource);
+            fseek($stream, 0);
+        }
+        return new Stream($stream, $options);
+    }
+
+    switch (gettype($resource)) {
+        case 'resource':
+            return new Stream($resource, $options);
+        case 'object':
+            if ($resource instanceof StreamInterface) {
+                return $resource;
+            } elseif ($resource instanceof \Iterator) {
+                return new PumpStream(function () use ($resource) {
+                    if (!$resource->valid()) {
+                        return false;
+                    }
+                    $result = $resource->current();
+                    $resource->next();
+                    return $result;
+                }, $options);
+            } elseif (method_exists($resource, '__toString')) {
+                return stream_for((string) $resource, $options);
+            }
+            break;
+        case 'NULL':
+            return new Stream(fopen('php://temp', 'r+'), $options);
+    }
+
+    if (is_callable($resource)) {
+        return new PumpStream($resource, $options);
+    }
+
+    throw new \InvalidArgumentException('Invalid resource type: ' . gettype($resource));
+}
+
+/**
+ * Parse an array of header values containing ";" separated data into an
+ * array of associative arrays representing the header key value pair
+ * data of the header. When a parameter does not contain a value, but just
+ * contains a key, this function will inject a key with a '' string value.
+ *
+ * @param string|array $header Header to parse into components.
+ *
+ * @return array Returns the parsed header values.
+ */
+function parse_header($header)
+{
+    static $trimmed = "\"'  \n\t\r";
+    $params = $matches = [];
+
+    foreach (normalize_header($header) as $val) {
+        $part = [];
+        foreach (preg_split('/;(?=([^"]*"[^"]*")*[^"]*$)/', $val) as $kvp) {
+            if (preg_match_all('/<[^>]+>|[^=]+/', $kvp, $matches)) {
+                $m = $matches[0];
+                if (isset($m[1])) {
+                    $part[trim($m[0], $trimmed)] = trim($m[1], $trimmed);
+                } else {
+                    $part[] = trim($m[0], $trimmed);
+                }
+            }
+        }
+        if ($part) {
+            $params[] = $part;
+        }
+    }
+
+    return $params;
+}
+
+/**
+ * Converts an array of header values that may contain comma separated
+ * headers into an array of headers with no comma separated values.
+ *
+ * @param string|array $header Header to normalize.
+ *
+ * @return array Returns the normalized header field values.
+ */
+function normalize_header($header)
+{
+    if (!is_array($header)) {
+        return array_map('trim', explode(',', $header));
+    }
+
+    $result = [];
+    foreach ($header as $value) {
+        foreach ((array) $value as $v) {
+            if (strpos($v, ',') === false) {
+                $result[] = $v;
+                continue;
+            }
+            foreach (preg_split('/,(?=([^"]*"[^"]*")*[^"]*$)/', $v) as $vv) {
+                $result[] = trim($vv);
+            }
+        }
+    }
+
+    return $result;
+}
+
+/**
+ * Clone and modify a request with the given changes.
+ *
+ * The changes can be one of:
+ * - method: (string) Changes the HTTP method.
+ * - set_headers: (array) Sets the given headers.
+ * - remove_headers: (array) Remove the given headers.
+ * - body: (mixed) Sets the given body.
+ * - uri: (UriInterface) Set the URI.
+ * - query: (string) Set the query string value of the URI.
+ * - version: (string) Set the protocol version.
+ *
+ * @param RequestInterface $request Request to clone and modify.
+ * @param array            $changes Changes to apply.
+ *
+ * @return RequestInterface
+ */
+function modify_request(RequestInterface $request, array $changes)
+{
+    if (!$changes) {
+        return $request;
+    }
+
+    $headers = $request->getHeaders();
+
+    if (!isset($changes['uri'])) {
+        $uri = $request->getUri();
+    } else {
+        // Remove the host header if one is on the URI
+        if ($host = $changes['uri']->getHost()) {
+            $changes['set_headers']['Host'] = $host;
+
+            if ($port = $changes['uri']->getPort()) {
+                $standardPorts = ['http' => 80, 'https' => 443];
+                $scheme = $changes['uri']->getScheme();
+                if (isset($standardPorts[$scheme]) && $port != $standardPorts[$scheme]) {
+                    $changes['set_headers']['Host'] .= ':'.$port;
+                }
+            }
+        }
+        $uri = $changes['uri'];
+    }
+
+    if (!empty($changes['remove_headers'])) {
+        $headers = _caseless_remove($changes['remove_headers'], $headers);
+    }
+
+    if (!empty($changes['set_headers'])) {
+        $headers = _caseless_remove(array_keys($changes['set_headers']), $headers);
+        $headers = $changes['set_headers'] + $headers;
+    }
+
+    if (isset($changes['query'])) {
+        $uri = $uri->withQuery($changes['query']);
+    }
+
+    if ($request instanceof ServerRequestInterface) {
+        return (new ServerRequest(
+            isset($changes['method']) ? $changes['method'] : $request->getMethod(),
+            $uri,
+            $headers,
+            isset($changes['body']) ? $changes['body'] : $request->getBody(),
+            isset($changes['version'])
+                ? $changes['version']
+                : $request->getProtocolVersion(),
+            $request->getServerParams()
+        ))
+        ->withParsedBody($request->getParsedBody())
+        ->withQueryParams($request->getQueryParams())
+        ->withCookieParams($request->getCookieParams())
+        ->withUploadedFiles($request->getUploadedFiles());
+    }
+
+    return new Request(
+        isset($changes['method']) ? $changes['method'] : $request->getMethod(),
+        $uri,
+        $headers,
+        isset($changes['body']) ? $changes['body'] : $request->getBody(),
+        isset($changes['version'])
+            ? $changes['version']
+            : $request->getProtocolVersion()
+    );
+}
+
+/**
+ * Attempts to rewind a message body and throws an exception on failure.
+ *
+ * The body of the message will only be rewound if a call to `tell()` returns a
+ * value other than `0`.
+ *
+ * @param MessageInterface $message Message to rewind
+ *
+ * @throws \RuntimeException
+ */
+function rewind_body(MessageInterface $message)
+{
+    $body = $message->getBody();
+
+    if ($body->tell()) {
+        $body->rewind();
+    }
+}
+
+/**
+ * Safely opens a PHP stream resource using a filename.
+ *
+ * When fopen fails, PHP normally raises a warning. This function adds an
+ * error handler that checks for errors and throws an exception instead.
+ *
+ * @param string $filename File to open
+ * @param string $mode     Mode used to open the file
+ *
+ * @return resource
+ * @throws \RuntimeException if the file cannot be opened
+ */
+function try_fopen($filename, $mode)
+{
+    $ex = null;
+    set_error_handler(function () use ($filename, $mode, &$ex) {
+        $ex = new \RuntimeException(sprintf(
+            'Unable to open %s using mode %s: %s',
+            $filename,
+            $mode,
+            func_get_args()[1]
+        ));
+    });
+
+    $handle = fopen($filename, $mode);
+    restore_error_handler();
+
+    if ($ex) {
+        /** @var $ex \RuntimeException */
+        throw $ex;
+    }
+
+    return $handle;
+}
+
+/**
+ * Copy the contents of a stream into a string until the given number of
+ * bytes have been read.
+ *
+ * @param StreamInterface $stream Stream to read
+ * @param int             $maxLen Maximum number of bytes to read. Pass -1
+ *                                to read the entire stream.
+ * @return string
+ * @throws \RuntimeException on error.
+ */
+function copy_to_string(StreamInterface $stream, $maxLen = -1)
+{
+    $buffer = '';
+
+    if ($maxLen === -1) {
+        while (!$stream->eof()) {
+            $buf = $stream->read(1048576);
+            // Using a loose equality here to match on '' and false.
+            if ($buf == null) {
+                break;
+            }
+            $buffer .= $buf;
+        }
+        return $buffer;
+    }
+
+    $len = 0;
+    while (!$stream->eof() && $len < $maxLen) {
+        $buf = $stream->read($maxLen - $len);
+        // Using a loose equality here to match on '' and false.
+        if ($buf == null) {
+            break;
+        }
+        $buffer .= $buf;
+        $len = strlen($buffer);
+    }
+
+    return $buffer;
+}
+
+/**
+ * Copy the contents of a stream into another stream until the given number
+ * of bytes have been read.
+ *
+ * @param StreamInterface $source Stream to read from
+ * @param StreamInterface $dest   Stream to write to
+ * @param int             $maxLen Maximum number of bytes to read. Pass -1
+ *                                to read the entire stream.
+ *
+ * @throws \RuntimeException on error.
+ */
+function copy_to_stream(
+    StreamInterface $source,
+    StreamInterface $dest,
+    $maxLen = -1
+) {
+    $bufferSize = 8192;
+
+    if ($maxLen === -1) {
+        while (!$source->eof()) {
+            if (!$dest->write($source->read($bufferSize))) {
+                break;
+            }
+        }
+    } else {
+        $remaining = $maxLen;
+        while ($remaining > 0 && !$source->eof()) {
+            $buf = $source->read(min($bufferSize, $remaining));
+            $len = strlen($buf);
+            if (!$len) {
+                break;
+            }
+            $remaining -= $len;
+            $dest->write($buf);
+        }
+    }
+}
+
+/**
+ * Calculate a hash of a Stream
+ *
+ * @param StreamInterface $stream    Stream to calculate the hash for
+ * @param string          $algo      Hash algorithm (e.g. md5, crc32, etc)
+ * @param bool            $rawOutput Whether or not to use raw output
+ *
+ * @return string Returns the hash of the stream
+ * @throws \RuntimeException on error.
+ */
+function hash(
+    StreamInterface $stream,
+    $algo,
+    $rawOutput = false
+) {
+    $pos = $stream->tell();
+
+    if ($pos > 0) {
+        $stream->rewind();
+    }
+
+    $ctx = hash_init($algo);
+    while (!$stream->eof()) {
+        hash_update($ctx, $stream->read(1048576));
+    }
+
+    $out = hash_final($ctx, (bool) $rawOutput);
+    $stream->seek($pos);
+
+    return $out;
+}
+
+/**
+ * Read a line from the stream up to the maximum allowed buffer length
+ *
+ * @param StreamInterface $stream    Stream to read from
+ * @param int             $maxLength Maximum buffer length
+ *
+ * @return string
+ */
+function readline(StreamInterface $stream, $maxLength = null)
+{
+    $buffer = '';
+    $size = 0;
+
+    while (!$stream->eof()) {
+        // Using a loose equality here to match on '' and false.
+        if (null == ($byte = $stream->read(1))) {
+            return $buffer;
+        }
+        $buffer .= $byte;
+        // Break when a new line is found or the max length - 1 is reached
+        if ($byte === "\n" || ++$size === $maxLength - 1) {
+            break;
+        }
+    }
+
+    return $buffer;
+}
+
+/**
+ * Parses a request message string into a request object.
+ *
+ * @param string $message Request message string.
+ *
+ * @return Request
+ */
+function parse_request($message)
+{
+    $data = _parse_message($message);
+    $matches = [];
+    if (!preg_match('/^[\S]+\s+([a-zA-Z]+:\/\/|\/).*/', $data['start-line'], $matches)) {
+        throw new \InvalidArgumentException('Invalid request string');
+    }
+    $parts = explode(' ', $data['start-line'], 3);
+    $version = isset($parts[2]) ? explode('/', $parts[2])[1] : '1.1';
+
+    $request = new Request(
+        $parts[0],
+        $matches[1] === '/' ? _parse_request_uri($parts[1], $data['headers']) : $parts[1],
+        $data['headers'],
+        $data['body'],
+        $version
+    );
+
+    return $matches[1] === '/' ? $request : $request->withRequestTarget($parts[1]);
+}
+
+/**
+ * Parses a response message string into a response object.
+ *
+ * @param string $message Response message string.
+ *
+ * @return Response
+ */
+function parse_response($message)
+{
+    $data = _parse_message($message);
+    // According to https://tools.ietf.org/html/rfc7230#section-3.1.2 the space
+    // between status-code and reason-phrase is required. But browsers accept
+    // responses without space and reason as well.
+    if (!preg_match('/^HTTP\/.* [0-9]{3}( .*|$)/', $data['start-line'])) {
+        throw new \InvalidArgumentException('Invalid response string: ' . $data['start-line']);
+    }
+    $parts = explode(' ', $data['start-line'], 3);
+
+    return new Response(
+        $parts[1],
+        $data['headers'],
+        $data['body'],
+        explode('/', $parts[0])[1],
+        isset($parts[2]) ? $parts[2] : null
+    );
+}
+
+/**
+ * Parse a query string into an associative array.
+ *
+ * If multiple values are found for the same key, the value of that key
+ * value pair will become an array. This function does not parse nested
+ * PHP style arrays into an associative array (e.g., foo[a]=1&foo[b]=2 will
+ * be parsed into ['foo[a]' => '1', 'foo[b]' => '2']).
+ *
+ * @param string   $str         Query string to parse
+ * @param int|bool $urlEncoding How the query string is encoded
+ *
+ * @return array
+ */
+function parse_query($str, $urlEncoding = true)
+{
+    $result = [];
+
+    if ($str === '') {
+        return $result;
+    }
+
+    if ($urlEncoding === true) {
+        $decoder = function ($value) {
+            return rawurldecode(str_replace('+', ' ', $value));
+        };
+    } elseif ($urlEncoding === PHP_QUERY_RFC3986) {
+        $decoder = 'rawurldecode';
+    } elseif ($urlEncoding === PHP_QUERY_RFC1738) {
+        $decoder = 'urldecode';
+    } else {
+        $decoder = function ($str) { return $str; };
+    }
+
+    foreach (explode('&', $str) as $kvp) {
+        $parts = explode('=', $kvp, 2);
+        $key = $decoder($parts[0]);
+        $value = isset($parts[1]) ? $decoder($parts[1]) : null;
+        if (!isset($result[$key])) {
+            $result[$key] = $value;
+        } else {
+            if (!is_array($result[$key])) {
+                $result[$key] = [$result[$key]];
+            }
+            $result[$key][] = $value;
+        }
+    }
+
+    return $result;
+}
+
+/**
+ * Build a query string from an array of key value pairs.
+ *
+ * This function can use the return value of parse_query() to build a query
+ * string. This function does not modify the provided keys when an array is
+ * encountered (like http_build_query would).
+ *
+ * @param array     $params   Query string parameters.
+ * @param int|false $encoding Set to false to not encode, PHP_QUERY_RFC3986
+ *                            to encode using RFC3986, or PHP_QUERY_RFC1738
+ *                            to encode using RFC1738.
+ * @return string
+ */
+function build_query(array $params, $encoding = PHP_QUERY_RFC3986)
+{
+    if (!$params) {
+        return '';
+    }
+
+    if ($encoding === false) {
+        $encoder = function ($str) { return $str; };
+    } elseif ($encoding === PHP_QUERY_RFC3986) {
+        $encoder = 'rawurlencode';
+    } elseif ($encoding === PHP_QUERY_RFC1738) {
+        $encoder = 'urlencode';
+    } else {
+        throw new \InvalidArgumentException('Invalid type');
+    }
+
+    $qs = '';
+    foreach ($params as $k => $v) {
+        $k = $encoder($k);
+        if (!is_array($v)) {
+            $qs .= $k;
+            if ($v !== null) {
+                $qs .= '=' . $encoder($v);
+            }
+            $qs .= '&';
+        } else {
+            foreach ($v as $vv) {
+                $qs .= $k;
+                if ($vv !== null) {
+                    $qs .= '=' . $encoder($vv);
+                }
+                $qs .= '&';
+            }
+        }
+    }
+
+    return $qs ? (string) substr($qs, 0, -1) : '';
+}
+
+/**
+ * Determines the mimetype of a file by looking at its extension.
+ *
+ * @param $filename
+ *
+ * @return null|string
+ */
+function mimetype_from_filename($filename)
+{
+    return mimetype_from_extension(pathinfo($filename, PATHINFO_EXTENSION));
+}
+
+/**
+ * Maps a file extensions to a mimetype.
+ *
+ * @param $extension string The file extension.
+ *
+ * @return string|null
+ * @link http://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x/conf/mime.types
+ */
+function mimetype_from_extension($extension)
+{
+    static $mimetypes = [
+        '3gp' => 'video/3gpp',
+        '7z' => 'application/x-7z-compressed',
+        'aac' => 'audio/x-aac',
+        'ai' => 'application/postscript',
+        'aif' => 'audio/x-aiff',
+        'asc' => 'text/plain',
+        'asf' => 'video/x-ms-asf',
+        'atom' => 'application/atom+xml',
+        'avi' => 'video/x-msvideo',
+        'bmp' => 'image/bmp',
+        'bz2' => 'application/x-bzip2',
+        'cer' => 'application/pkix-cert',
+        'crl' => 'application/pkix-crl',
+        'crt' => 'application/x-x509-ca-cert',
+        'css' => 'text/css',
+        'csv' => 'text/csv',
+        'cu' => 'application/cu-seeme',
+        'deb' => 'application/x-debian-package',
+        'doc' => 'application/msword',
+        'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+        'dvi' => 'application/x-dvi',
+        'eot' => 'application/vnd.ms-fontobject',
+        'eps' => 'application/postscript',
+        'epub' => 'application/epub+zip',
+        'etx' => 'text/x-setext',
+        'flac' => 'audio/flac',
+        'flv' => 'video/x-flv',
+        'gif' => 'image/gif',
+        'gz' => 'application/gzip',
+        'htm' => 'text/html',
+        'html' => 'text/html',
+        'ico' => 'image/x-icon',
+        'ics' => 'text/calendar',
+        'ini' => 'text/plain',
+        'iso' => 'application/x-iso9660-image',
+        'jar' => 'application/java-archive',
+        'jpe' => 'image/jpeg',
+        'jpeg' => 'image/jpeg',
+        'jpg' => 'image/jpeg',
+        'js' => 'text/javascript',
+        'json' => 'application/json',
+        'latex' => 'application/x-latex',
+        'log' => 'text/plain',
+        'm4a' => 'audio/mp4',
+        'm4v' => 'video/mp4',
+        'mid' => 'audio/midi',
+        'midi' => 'audio/midi',
+        'mov' => 'video/quicktime',
+        'mkv' => 'video/x-matroska',
+        'mp3' => 'audio/mpeg',
+        'mp4' => 'video/mp4',
+        'mp4a' => 'audio/mp4',
+        'mp4v' => 'video/mp4',
+        'mpe' => 'video/mpeg',
+        'mpeg' => 'video/mpeg',
+        'mpg' => 'video/mpeg',
+        'mpg4' => 'video/mp4',
+        'oga' => 'audio/ogg',
+        'ogg' => 'audio/ogg',
+        'ogv' => 'video/ogg',
+        'ogx' => 'application/ogg',
+        'pbm' => 'image/x-portable-bitmap',
+        'pdf' => 'application/pdf',
+        'pgm' => 'image/x-portable-graymap',
+        'png' => 'image/png',
+        'pnm' => 'image/x-portable-anymap',
+        'ppm' => 'image/x-portable-pixmap',
+        'ppt' => 'application/vnd.ms-powerpoint',
+        'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+        'ps' => 'application/postscript',
+        'qt' => 'video/quicktime',
+        'rar' => 'application/x-rar-compressed',
+        'ras' => 'image/x-cmu-raster',
+        'rss' => 'application/rss+xml',
+        'rtf' => 'application/rtf',
+        'sgm' => 'text/sgml',
+        'sgml' => 'text/sgml',
+        'svg' => 'image/svg+xml',
+        'swf' => 'application/x-shockwave-flash',
+        'tar' => 'application/x-tar',
+        'tif' => 'image/tiff',
+        'tiff' => 'image/tiff',
+        'torrent' => 'application/x-bittorrent',
+        'ttf' => 'application/x-font-ttf',
+        'txt' => 'text/plain',
+        'wav' => 'audio/x-wav',
+        'webm' => 'video/webm',
+        'webp' => 'image/webp',
+        'wma' => 'audio/x-ms-wma',
+        'wmv' => 'video/x-ms-wmv',
+        'woff' => 'application/x-font-woff',
+        'wsdl' => 'application/wsdl+xml',
+        'xbm' => 'image/x-xbitmap',
+        'xls' => 'application/vnd.ms-excel',
+        'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+        'xml' => 'application/xml',
+        'xpm' => 'image/x-xpixmap',
+        'xwd' => 'image/x-xwindowdump',
+        'yaml' => 'text/yaml',
+        'yml' => 'text/yaml',
+        'zip' => 'application/zip',
+    ];
+
+    $extension = strtolower($extension);
+
+    return isset($mimetypes[$extension])
+        ? $mimetypes[$extension]
+        : null;
+}
+
+/**
+ * Parses an HTTP message into an associative array.
+ *
+ * The array contains the "start-line" key containing the start line of
+ * the message, "headers" key containing an associative array of header
+ * array values, and a "body" key containing the body of the message.
+ *
+ * @param string $message HTTP request or response to parse.
+ *
+ * @return array
+ * @internal
+ */
+function _parse_message($message)
+{
+    if (!$message) {
+        throw new \InvalidArgumentException('Invalid message');
+    }
+
+    $message = ltrim($message, "\r\n");
+
+    $messageParts = preg_split("/\r?\n\r?\n/", $message, 2);
+
+    if ($messageParts === false || count($messageParts) !== 2) {
+        throw new \InvalidArgumentException('Invalid message: Missing header delimiter');
+    }
+
+    list($rawHeaders, $body) = $messageParts;
+    $rawHeaders .= "\r\n"; // Put back the delimiter we split previously
+    $headerParts = preg_split("/\r?\n/", $rawHeaders, 2);
+
+    if ($headerParts === false || count($headerParts) !== 2) {
+        throw new \InvalidArgumentException('Invalid message: Missing status line');
+    }
+
+    list($startLine, $rawHeaders) = $headerParts;
+
+    if (preg_match("/(?:^HTTP\/|^[A-Z]+ \S+ HTTP\/)(\d+(?:\.\d+)?)/i", $startLine, $matches) && $matches[1] === '1.0') {
+        // Header folding is deprecated for HTTP/1.1, but allowed in HTTP/1.0
+        $rawHeaders = preg_replace(Rfc7230::HEADER_FOLD_REGEX, ' ', $rawHeaders);
+    }
+
+    /** @var array[] $headerLines */
+    $count = preg_match_all(Rfc7230::HEADER_REGEX, $rawHeaders, $headerLines, PREG_SET_ORDER);
+
+    // If these aren't the same, then one line didn't match and there's an invalid header.
+    if ($count !== substr_count($rawHeaders, "\n")) {
+        // Folding is deprecated, see https://tools.ietf.org/html/rfc7230#section-3.2.4
+        if (preg_match(Rfc7230::HEADER_FOLD_REGEX, $rawHeaders)) {
+            throw new \InvalidArgumentException('Invalid header syntax: Obsolete line folding');
+        }
+
+        throw new \InvalidArgumentException('Invalid header syntax');
+    }
+
+    $headers = [];
+
+    foreach ($headerLines as $headerLine) {
+        $headers[$headerLine[1]][] = $headerLine[2];
+    }
+
+    return [
+        'start-line' => $startLine,
+        'headers' => $headers,
+        'body' => $body,
+    ];
+}
+
+/**
+ * Constructs a URI for an HTTP request message.
+ *
+ * @param string $path    Path from the start-line
+ * @param array  $headers Array of headers (each value an array).
+ *
+ * @return string
+ * @internal
+ */
+function _parse_request_uri($path, array $headers)
+{
+    $hostKey = array_filter(array_keys($headers), function ($k) {
+        return strtolower($k) === 'host';
+    });
+
+    // If no host is found, then a full URI cannot be constructed.
+    if (!$hostKey) {
+        return $path;
+    }
+
+    $host = $headers[reset($hostKey)][0];
+    $scheme = substr($host, -4) === ':443' ? 'https' : 'http';
+
+    return $scheme . '://' . $host . '/' . ltrim($path, '/');
+}
+
+/**
+ * Get a short summary of the message body
+ *
+ * Will return `null` if the response is not printable.
+ *
+ * @param MessageInterface $message    The message to get the body summary
+ * @param int              $truncateAt The maximum allowed size of the summary
+ *
+ * @return null|string
+ */
+function get_message_body_summary(MessageInterface $message, $truncateAt = 120)
+{
+    $body = $message->getBody();
+
+    if (!$body->isSeekable() || !$body->isReadable()) {
+        return null;
+    }
+
+    $size = $body->getSize();
+
+    if ($size === 0) {
+        return null;
+    }
+
+    $summary = $body->read($truncateAt);
+    $body->rewind();
+
+    if ($size > $truncateAt) {
+        $summary .= ' (truncated...)';
+    }
+
+    // Matches any printable character, including unicode characters:
+    // letters, marks, numbers, punctuation, spacing, and separators.
+    if (preg_match('/[^\pL\pM\pN\pP\pS\pZ\n\r\t]/', $summary)) {
+        return null;
+    }
+
+    return $summary;
+}
+
+/** @internal */
+function _caseless_remove($keys, array $data)
+{
+    $result = [];
+
+    foreach ($keys as &$key) {
+        $key = strtolower($key);
+    }
+
+    foreach ($data as $k => $v) {
+        if (!in_array(strtolower($k), $keys)) {
+            $result[$k] = $v;
+        }
+    }
+
+    return $result;
+}

wp-content/plugins/wp-mail-smtp/vendor/guzzlehttp/psr7/src/functions_include.php

@@ -0,0 +1,6 @@
+<?php
+
+// Don't redefine the functions if included multiple times.
+if (!function_exists('GuzzleHttp\Psr7\str')) {
+    require __DIR__ . '/functions.php';
+}