Initial commit

wp-content/plugins/wp-mail-smtp/vendor/google/auth/src/FetchAuthTokenCache.php

@@ -0,0 +1,142 @@
+<?php
+/*
+ * Copyright 2010 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace Google\Auth;
+
+use Psr\Cache\CacheItemPoolInterface;
+
+/**
+ * A class to implement caching for any object implementing
+ * FetchAuthTokenInterface
+ */
+class FetchAuthTokenCache implements FetchAuthTokenInterface, SignBlobInterface
+{
+    use CacheTrait;
+
+    /**
+     * @var FetchAuthTokenInterface
+     */
+    private $fetcher;
+
+    /**
+     * @var array
+     */
+    private $cacheConfig;
+
+    /**
+     * @var CacheItemPoolInterface
+     */
+    private $cache;
+
+    public function __construct(
+        FetchAuthTokenInterface $fetcher,
+        array $cacheConfig = null,
+        CacheItemPoolInterface $cache
+    ) {
+        $this->fetcher = $fetcher;
+        $this->cache = $cache;
+        $this->cacheConfig = array_merge([
+            'lifetime' => 1500,
+            'prefix' => '',
+        ], (array) $cacheConfig);
+    }
+
+    /**
+     * Implements FetchAuthTokenInterface#fetchAuthToken.
+     *
+     * Checks the cache for a valid auth token and fetches the auth tokens
+     * from the supplied fetcher.
+     *
+     * @param callable $httpHandler callback which delivers psr7 request
+     *
+     * @return array the response
+     *
+     * @throws \Exception
+     */
+    public function fetchAuthToken(callable $httpHandler = null)
+    {
+        // Use the cached value if its available.
+        //
+        // TODO: correct caching; update the call to setCachedValue to set the expiry
+        // to the value returned with the auth token.
+        //
+        // TODO: correct caching; enable the cache to be cleared.
+        $cacheKey = $this->fetcher->getCacheKey();
+        $cached = $this->getCachedValue($cacheKey);
+        if (!empty($cached)) {
+            return ['access_token' => $cached];
+        }
+
+        $auth_token = $this->fetcher->fetchAuthToken($httpHandler);
+
+        if (isset($auth_token['access_token'])) {
+            $this->setCachedValue($cacheKey, $auth_token['access_token']);
+        }
+
+        return $auth_token;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCacheKey()
+    {
+        return $this->getFullCacheKey($this->fetcher->getCacheKey());
+    }
+
+    /**
+     * @return array|null
+     */
+    public function getLastReceivedToken()
+    {
+        return $this->fetcher->getLastReceivedToken();
+    }
+
+    /**
+     * Get the client name from the fetcher.
+     *
+     * @param callable $httpHandler An HTTP handler to deliver PSR7 requests.
+     * @return string
+     */
+    public function getClientName(callable $httpHandler = null)
+    {
+        return $this->fetcher->getClientName($httpHandler);
+    }
+
+    /**
+     * Sign a blob using the fetcher.
+     *
+     * @param string $stringToSign The string to sign.
+     * @param bool $forceOpenssl Require use of OpenSSL for local signing. Does
+     *        not apply to signing done using external services. **Defaults to**
+     *        `false`.
+     * @return string The resulting signature.
+     * @throws \RuntimeException If the fetcher does not implement
+     *     `Google\Auth\SignBlobInterface`.
+     */
+    public function signBlob($stringToSign, $forceOpenSsl =  false)
+    {
+        if (!$this->fetcher instanceof SignBlobInterface) {
+            throw new \RuntimeException(
+                'Credentials fetcher does not implement ' .
+                'Google\Auth\SignBlobInterface'
+            );
+        }
+
+        return $this->fetcher->signBlob($stringToSign, $forceOpenSsl);
+    }
+}