643 lines
21 KiB
PHP
643 lines
21 KiB
PHP
<?php
|
|
// vim: foldmethod=marker
|
|
|
|
/* Generic exception class
|
|
*/
|
|
class W3tcOAuthException extends Exception {
|
|
// pass
|
|
}
|
|
|
|
|
|
class W3tcOAuthConsumer {
|
|
public $key;
|
|
public $secret;
|
|
|
|
function __construct($key, $secret, $callback_url=NULL) {
|
|
$this->key = $key;
|
|
$this->secret = $secret;
|
|
$this->callback_url = $callback_url;
|
|
}
|
|
|
|
function __toString() {
|
|
return "OAuthConsumer[key=$this->key,secret=$this->secret]";
|
|
}
|
|
}
|
|
|
|
class W3tcOAuthToken {
|
|
// access tokens and request tokens
|
|
public $key;
|
|
public $secret;
|
|
|
|
/**
|
|
* key = the token
|
|
* secret = the token secret
|
|
*/
|
|
function __construct($key, $secret) {
|
|
$this->key = $key;
|
|
$this->secret = $secret;
|
|
}
|
|
|
|
/**
|
|
* generates the basic string serialization of a token that a server
|
|
* would respond to request_token and access_token calls with
|
|
*/
|
|
function to_string() {
|
|
return "oauth_token=" .
|
|
W3tcOAuthUtil::urlencode_rfc3986($this->key) .
|
|
"&oauth_token_secret=" .
|
|
W3tcOAuthUtil::urlencode_rfc3986($this->secret);
|
|
}
|
|
|
|
function __toString() {
|
|
return $this->to_string();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A class for implementing a Signature Method
|
|
* See section 9 ("Signing Requests") in the spec
|
|
*/
|
|
abstract class W3tcOAuthSignatureMethod {
|
|
/**
|
|
* Needs to return the name of the Signature Method (ie HMAC-SHA1)
|
|
* @return string
|
|
*/
|
|
abstract public function get_name();
|
|
|
|
/**
|
|
* Build up the signature
|
|
* NOTE: The output of this function MUST NOT be urlencoded.
|
|
* the encoding is handled in OAuthRequest when the final
|
|
* request is serialized
|
|
* @param W3tcOAuthRequest $request
|
|
* @param W3tcOAuthConsumer $consumer
|
|
* @param W3tcOAuthToken $token
|
|
* @return string
|
|
*/
|
|
abstract public function build_signature($request, $consumer, $token);
|
|
|
|
/**
|
|
* Verifies that a given signature is correct
|
|
* @param W3tcOAuthRequest $request
|
|
* @param W3tcOAuthConsumer $consumer
|
|
* @param W3tcOAuthToken $token
|
|
* @param string $signature
|
|
* @return bool
|
|
*/
|
|
public function check_signature($request, $consumer, $token, $signature) {
|
|
$built = $this->build_signature($request, $consumer, $token);
|
|
|
|
// Check for zero length, although unlikely here
|
|
if (strlen($built) == 0 || strlen($signature) == 0) {
|
|
return false;
|
|
}
|
|
|
|
return $built == $signature;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104]
|
|
* where the Signature Base String is the text and the key is the concatenated values (each first
|
|
* encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
|
|
* character (ASCII code 38) even if empty.
|
|
* - Chapter 9.2 ("HMAC-SHA1")
|
|
*/
|
|
class W3tcOAuthSignatureMethod_HMAC_SHA1 extends W3tcOAuthSignatureMethod {
|
|
function get_name() {
|
|
return "HMAC-SHA1";
|
|
}
|
|
|
|
public function build_signature($request, $consumer, $token) {
|
|
$base_string = $request->get_signature_base_string();
|
|
$request->base_string = $base_string;
|
|
|
|
$key_parts = array(
|
|
$consumer->secret,
|
|
($token) ? $token->secret : ""
|
|
);
|
|
|
|
$key_parts = W3tcOAuthUtil::urlencode_rfc3986($key_parts);
|
|
$key = implode('&', $key_parts);
|
|
|
|
return base64_encode(hash_hmac('sha1', $base_string, $key, true));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The PLAINTEXT method does not provide any security protection and SHOULD only be used
|
|
* over a secure channel such as HTTPS. It does not use the Signature Base String.
|
|
* - Chapter 9.4 ("PLAINTEXT")
|
|
*/
|
|
class W3tcOAuthSignatureMethod_PLAINTEXT extends W3tcOAuthSignatureMethod {
|
|
public function get_name() {
|
|
return "PLAINTEXT";
|
|
}
|
|
|
|
/**
|
|
* oauth_signature is set to the concatenated encoded values of the Consumer Secret and
|
|
* Token Secret, separated by a '&' character (ASCII code 38), even if either secret is
|
|
* empty. The result MUST be encoded again.
|
|
* - Chapter 9.4.1 ("Generating Signatures")
|
|
*
|
|
* Please note that the second encoding MUST NOT happen in the SignatureMethod, as
|
|
* OAuthRequest handles this!
|
|
*/
|
|
public function build_signature($request, $consumer, $token) {
|
|
$key_parts = array(
|
|
$consumer->secret,
|
|
($token) ? $token->secret : ""
|
|
);
|
|
|
|
$key_parts = W3tcOAuthUtil::urlencode_rfc3986($key_parts);
|
|
$key = implode('&', $key_parts);
|
|
$request->base_string = $key;
|
|
|
|
return $key;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The RSA-SHA1 signature method uses the RSASSA-PKCS1-v1_5 signature algorithm as defined in
|
|
* [RFC3447] section 8.2 (more simply known as PKCS#1), using SHA-1 as the hash function for
|
|
* EMSA-PKCS1-v1_5. It is assumed that the Consumer has provided its RSA public key in a
|
|
* verified way to the Service Provider, in a manner which is beyond the scope of this
|
|
* specification.
|
|
* - Chapter 9.3 ("RSA-SHA1")
|
|
*/
|
|
abstract class W3tcOAuthSignatureMethod_RSA_SHA1 extends W3tcOAuthSignatureMethod {
|
|
public function get_name() {
|
|
return "RSA-SHA1";
|
|
}
|
|
|
|
// Up to the SP to implement this lookup of keys. Possible ideas are:
|
|
// (1) do a lookup in a table of trusted certs keyed off of consumer
|
|
// (2) fetch via http using a url provided by the requester
|
|
// (3) some sort of specific discovery code based on request
|
|
//
|
|
// Either way should return a string representation of the certificate
|
|
protected abstract function fetch_public_cert(&$request);
|
|
|
|
// Up to the SP to implement this lookup of keys. Possible ideas are:
|
|
// (1) do a lookup in a table of trusted certs keyed off of consumer
|
|
//
|
|
// Either way should return a string representation of the certificate
|
|
protected abstract function fetch_private_cert(&$request);
|
|
|
|
public function build_signature($request, $consumer, $token) {
|
|
$base_string = $request->get_signature_base_string();
|
|
$request->base_string = $base_string;
|
|
|
|
// Fetch the private key cert based on the request
|
|
$cert = $this->fetch_private_cert($request);
|
|
|
|
// Pull the private key ID from the certificate
|
|
$privatekeyid = openssl_get_privatekey($cert);
|
|
|
|
// Sign using the key
|
|
$ok = openssl_sign($base_string, $signature, $privatekeyid);
|
|
|
|
// Release the key resource
|
|
openssl_free_key($privatekeyid);
|
|
|
|
return base64_encode($signature);
|
|
}
|
|
|
|
public function check_signature($request, $consumer, $token, $signature) {
|
|
$decoded_sig = base64_decode($signature);
|
|
|
|
$base_string = $request->get_signature_base_string();
|
|
|
|
// Fetch the public key cert based on the request
|
|
$cert = $this->fetch_public_cert($request);
|
|
|
|
// Pull the public key ID from the certificate
|
|
$publickeyid = openssl_get_publickey($cert);
|
|
|
|
// Check the computed signature against the one passed in the query
|
|
$ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
|
|
|
|
// Release the key resource
|
|
openssl_free_key($publickeyid);
|
|
|
|
return $ok == 1;
|
|
}
|
|
}
|
|
|
|
class W3tcOAuthRequest {
|
|
protected $parameters;
|
|
protected $http_method;
|
|
protected $http_url;
|
|
// for debug purposes
|
|
public $base_string;
|
|
public static $version = '1.0';
|
|
public static $POST_INPUT = 'php://input';
|
|
|
|
function __construct($http_method, $http_url, $parameters=NULL) {
|
|
$parameters = ($parameters) ? $parameters : array();
|
|
$parameters = array_merge( W3tcOAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
|
|
$this->parameters = $parameters;
|
|
$this->http_method = $http_method;
|
|
$this->http_url = $http_url;
|
|
}
|
|
|
|
|
|
/**
|
|
* attempt to build up a request from what was passed to the server
|
|
*/
|
|
public static function from_request($http_method=NULL, $http_url=NULL, $parameters=NULL) {
|
|
$scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on")
|
|
? 'http'
|
|
: 'https';
|
|
$http_url = ($http_url) ? $http_url : $scheme .
|
|
'://' . ( isset( $_SERVER['SERVER_NAME'] ) ? sanitize_text_field( wp_unslash( $_SERVER['SERVER_NAME'] ) ) : '' ) .
|
|
':' .
|
|
( isset( $_SERVER['SERVER_PORT'] ) ? sanitize_text_field( wp_unslash( $_SERVER['SERVER_PORT'] ) ) : '' ) .
|
|
( isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '' );
|
|
$http_method = ( $http_method ) ?
|
|
$http_method : ( isset( $_SERVER['REQUEST_METHOD'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_METHOD'] ) ) : '' );
|
|
|
|
// We weren't handed any parameters, so let's find the ones relevant to
|
|
// this request.
|
|
// If you run XML-RPC or similar you should use this to provide your own
|
|
// parsed parameter-list
|
|
if (!$parameters) {
|
|
// Find request headers
|
|
$request_headers = W3tcOAuthUtil::get_headers();
|
|
|
|
// Parse the query-string to find GET parameters
|
|
$parameters = W3tcOAuthUtil::parse_parameters( isset( $_SERVER['QUERY_STRING'] ) ? sanitize_text_field( wp_unslash( $_SERVER['QUERY_STRING'] ) ) : '' );
|
|
|
|
// It's a POST request of the proper content-type, so parse POST
|
|
// parameters and add those overriding any duplicates from GET
|
|
if ($http_method == "POST"
|
|
&& isset($request_headers['Content-Type'])
|
|
&& strstr($request_headers['Content-Type'],
|
|
'application/x-www-form-urlencoded')
|
|
) {
|
|
$post_data = W3tcOAuthUtil::parse_parameters(
|
|
file_get_contents(self::$POST_INPUT)
|
|
);
|
|
$parameters = array_merge($parameters, $post_data);
|
|
}
|
|
|
|
// We have a Authorization-header with OAuth data. Parse the header
|
|
// and add those overriding any duplicates from GET or POST
|
|
if (isset($request_headers['Authorization']) && substr($request_headers['Authorization'], 0, 6) == 'OAuth ') {
|
|
$header_parameters = W3tcOAuthUtil::split_header(
|
|
$request_headers['Authorization']
|
|
);
|
|
$parameters = array_merge($parameters, $header_parameters);
|
|
}
|
|
|
|
}
|
|
|
|
return new W3tcOAuthRequest($http_method, $http_url, $parameters);
|
|
}
|
|
|
|
/**
|
|
* pretty much a helper function to set up the request
|
|
*/
|
|
public static function from_consumer_and_token($consumer, $token, $http_method, $http_url, $parameters=NULL) {
|
|
$parameters = ($parameters) ? $parameters : array();
|
|
$defaults = array("oauth_version" => W3tcOAuthRequest::$version,
|
|
"oauth_nonce" => W3tcOAuthRequest::generate_nonce(),
|
|
"oauth_timestamp" => W3tcOAuthRequest::generate_timestamp(),
|
|
"oauth_consumer_key" => $consumer->key);
|
|
if ($token)
|
|
$defaults['oauth_token'] = $token->key;
|
|
|
|
$parameters = array_merge($defaults, $parameters);
|
|
|
|
return new W3tcOAuthRequest($http_method, $http_url, $parameters);
|
|
}
|
|
|
|
public function set_parameter($name, $value, $allow_duplicates = true) {
|
|
if ($allow_duplicates && isset($this->parameters[$name])) {
|
|
// We have already added parameter(s) with this name, so add to the list
|
|
if (is_scalar($this->parameters[$name])) {
|
|
// This is the first duplicate, so transform scalar (string)
|
|
// into an array so we can add the duplicates
|
|
$this->parameters[$name] = array($this->parameters[$name]);
|
|
}
|
|
|
|
$this->parameters[$name][] = $value;
|
|
} else {
|
|
$this->parameters[$name] = $value;
|
|
}
|
|
}
|
|
|
|
public function get_parameter($name) {
|
|
return isset($this->parameters[$name]) ? $this->parameters[$name] : null;
|
|
}
|
|
|
|
public function get_parameters() {
|
|
return $this->parameters;
|
|
}
|
|
|
|
public function unset_parameter($name) {
|
|
unset($this->parameters[$name]);
|
|
}
|
|
|
|
/**
|
|
* The request parameters, sorted and concatenated into a normalized string.
|
|
* @return string
|
|
*/
|
|
public function get_signable_parameters() {
|
|
// Grab all parameters
|
|
$params = $this->parameters;
|
|
|
|
// Remove oauth_signature if present
|
|
// Ref: Spec: 9.1.1 ("The oauth_signature parameter MUST be excluded.")
|
|
if (isset($params['oauth_signature'])) {
|
|
unset($params['oauth_signature']);
|
|
}
|
|
|
|
return W3tcOAuthUtil::build_http_query($params);
|
|
}
|
|
|
|
/**
|
|
* Returns the base string of this request
|
|
*
|
|
* The base string defined as the method, the url
|
|
* and the parameters (normalized), each urlencoded
|
|
* and the concated with &.
|
|
*/
|
|
public function get_signature_base_string() {
|
|
$parts = array(
|
|
$this->get_normalized_http_method(),
|
|
$this->get_normalized_http_url(),
|
|
$this->get_signable_parameters()
|
|
);
|
|
|
|
$parts = W3tcOAuthUtil::urlencode_rfc3986($parts);
|
|
|
|
return implode('&', $parts);
|
|
}
|
|
|
|
/**
|
|
* just uppercases the http method
|
|
*/
|
|
public function get_normalized_http_method() {
|
|
return strtoupper($this->http_method);
|
|
}
|
|
|
|
/**
|
|
* parses the url and rebuilds it to be
|
|
* scheme://host/path
|
|
*/
|
|
public function get_normalized_http_url() {
|
|
$parts = parse_url($this->http_url);
|
|
|
|
$scheme = (isset($parts['scheme'])) ? $parts['scheme'] : 'http';
|
|
$port = (isset($parts['port'])) ? $parts['port'] : (($scheme == 'https') ? '443' : '80');
|
|
$host = (isset($parts['host'])) ? strtolower($parts['host']) : '';
|
|
$path = (isset($parts['path'])) ? $parts['path'] : '';
|
|
|
|
if (($scheme == 'https' && $port != '443')
|
|
|| ($scheme == 'http' && $port != '80')) {
|
|
$host = "$host:$port";
|
|
}
|
|
return "$scheme://$host$path";
|
|
}
|
|
|
|
/**
|
|
* builds a url usable for a GET request
|
|
*/
|
|
public function to_url() {
|
|
$post_data = $this->to_postdata();
|
|
$out = $this->get_normalized_http_url();
|
|
if ($post_data) {
|
|
$out .= '?'.$post_data;
|
|
}
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* builds the data one would send in a POST request
|
|
*/
|
|
public function to_postdata() {
|
|
return W3tcOAuthUtil::build_http_query($this->parameters);
|
|
}
|
|
|
|
/**
|
|
* builds the Authorization: header
|
|
*/
|
|
public function to_header($realm=null) {
|
|
$first = true;
|
|
if($realm) {
|
|
$out = 'Authorization: OAuth realm="' . W3tcOAuthUtil::urlencode_rfc3986($realm) . '"';
|
|
$first = false;
|
|
} else
|
|
$out = 'Authorization: OAuth';
|
|
|
|
$total = array();
|
|
foreach ($this->parameters as $k => $v) {
|
|
if (substr($k, 0, 5) != "oauth") continue;
|
|
if (is_array($v)) {
|
|
throw new W3tcOAuthException('Arrays not supported in headers');
|
|
}
|
|
$out .= ($first) ? ' ' : ',';
|
|
$out .= W3tcOAuthUtil::urlencode_rfc3986($k) .
|
|
'="' .
|
|
W3tcOAuthUtil::urlencode_rfc3986($v) .
|
|
'"';
|
|
$first = false;
|
|
}
|
|
return $out;
|
|
}
|
|
|
|
public function __toString() {
|
|
return $this->to_url();
|
|
}
|
|
|
|
|
|
public function sign_request($signature_method, $consumer, $token) {
|
|
$this->set_parameter(
|
|
"oauth_signature_method",
|
|
$signature_method->get_name(),
|
|
false
|
|
);
|
|
$signature = $this->build_signature($signature_method, $consumer, $token);
|
|
$this->set_parameter("oauth_signature", $signature, false);
|
|
}
|
|
|
|
public function build_signature($signature_method, $consumer, $token) {
|
|
$signature = $signature_method->build_signature($this, $consumer, $token);
|
|
return $signature;
|
|
}
|
|
|
|
/**
|
|
* util function: current timestamp
|
|
*/
|
|
private static function generate_timestamp() {
|
|
return time();
|
|
}
|
|
|
|
/**
|
|
* util function: current nonce
|
|
*/
|
|
private static function generate_nonce() {
|
|
$mt = microtime();
|
|
$rand = mt_rand();
|
|
|
|
return md5($mt . $rand); // md5s look nicer than numbers
|
|
}
|
|
}
|
|
|
|
|
|
|
|
class W3tcOAuthUtil {
|
|
public static function urlencode_rfc3986($input) {
|
|
if (is_array($input)) {
|
|
return array_map(array('W3tcOAuthUtil', 'urlencode_rfc3986'), $input);
|
|
} else if (is_scalar($input)) {
|
|
return str_replace(
|
|
'+',
|
|
' ',
|
|
str_replace('%7E', '~', rawurlencode($input))
|
|
);
|
|
} else {
|
|
return '';
|
|
}
|
|
}
|
|
|
|
|
|
// This decode function isn't taking into consideration the above
|
|
// modifications to the encoding process. However, this method doesn't
|
|
// seem to be used anywhere so leaving it as is.
|
|
public static function urldecode_rfc3986($string) {
|
|
return urldecode($string);
|
|
}
|
|
|
|
// Utility function for turning the Authorization: header into
|
|
// parameters, has to do some unescaping
|
|
// Can filter out any non-oauth parameters if needed (default behaviour)
|
|
// May 28th, 2010 - method updated to tjerk.meesters for a speed improvement.
|
|
// see http://code.google.com/p/oauth/issues/detail?id=163
|
|
public static function split_header($header, $only_allow_oauth_parameters = true) {
|
|
$params = array();
|
|
if (preg_match_all('/('.($only_allow_oauth_parameters ? 'oauth_' : '').'[a-z_-]*)=(:?"([^"]*)"|([^,]*))/', $header, $matches)) {
|
|
foreach ($matches[1] as $i => $h) {
|
|
$params[$h] = W3tcOAuthUtil::urldecode_rfc3986(empty($matches[3][$i]) ? $matches[4][$i] : $matches[3][$i]);
|
|
}
|
|
if (isset($params['realm'])) {
|
|
unset($params['realm']);
|
|
}
|
|
}
|
|
return $params;
|
|
}
|
|
|
|
// helper to try to sort out headers for people who aren't running apache
|
|
public static function get_headers() {
|
|
if (function_exists('apache_request_headers')) {
|
|
// we need this to get the actual Authorization: header
|
|
// because apache tends to tell us it doesn't exist
|
|
$headers = apache_request_headers();
|
|
|
|
// sanitize the output of apache_request_headers because
|
|
// we always want the keys to be Cased-Like-This and arh()
|
|
// returns the headers in the same case as they are in the
|
|
// request
|
|
$out = array();
|
|
foreach ($headers AS $key => $value) {
|
|
$key = str_replace(
|
|
" ",
|
|
"-",
|
|
ucwords(strtolower(str_replace("-", " ", $key)))
|
|
);
|
|
$out[$key] = $value;
|
|
}
|
|
} else {
|
|
// otherwise we don't have apache and are just going to have to hope
|
|
// that $_SERVER actually contains what we need
|
|
$out = array();
|
|
if( isset($_SERVER['CONTENT_TYPE']) )
|
|
$out['Content-Type'] = sanitize_text_field( wp_unslash( $_SERVER['CONTENT_TYPE'] ) );
|
|
if( isset($_ENV['CONTENT_TYPE']) )
|
|
$out['Content-Type'] = sanitize_text_field( wp_unslash( $_ENV['CONTENT_TYPE'] ) );
|
|
|
|
foreach ($_SERVER as $key => $value) {
|
|
if (substr($key, 0, 5) == "HTTP_") {
|
|
// this is chaos, basically it is just there to capitalize the first
|
|
// letter of every word that is not an initial HTTP and strip HTTP
|
|
// code from przemek
|
|
$key = str_replace(
|
|
" ",
|
|
"-",
|
|
ucwords(strtolower(str_replace("_", " ", substr($key, 5))))
|
|
);
|
|
$out[$key] = $value;
|
|
}
|
|
}
|
|
}
|
|
return $out;
|
|
}
|
|
|
|
// This function takes a input like a=b&a=c&d=e and returns the parsed
|
|
// parameters like this
|
|
// array('a' => array('b','c'), 'd' => 'e')
|
|
public static function parse_parameters( $input ) {
|
|
if (!isset($input) || !$input) return array();
|
|
|
|
$pairs = explode('&', $input);
|
|
|
|
$parsed_parameters = array();
|
|
foreach ($pairs as $pair) {
|
|
$split = explode('=', $pair, 2);
|
|
$parameter = W3tcOAuthUtil::urldecode_rfc3986($split[0]);
|
|
$value = isset($split[1]) ? W3tcOAuthUtil::urldecode_rfc3986($split[1]) : '';
|
|
|
|
if (isset($parsed_parameters[$parameter])) {
|
|
// We have already recieved parameter(s) with this name, so add to the list
|
|
// of parameters with this name
|
|
|
|
if (is_scalar($parsed_parameters[$parameter])) {
|
|
// This is the first duplicate, so transform scalar (string) into an array
|
|
// so we can add the duplicates
|
|
$parsed_parameters[$parameter] = array($parsed_parameters[$parameter]);
|
|
}
|
|
|
|
$parsed_parameters[$parameter][] = $value;
|
|
} else {
|
|
$parsed_parameters[$parameter] = $value;
|
|
}
|
|
}
|
|
return $parsed_parameters;
|
|
}
|
|
|
|
public static function build_http_query($params) {
|
|
if (!$params) return '';
|
|
|
|
// Urlencode both keys and values
|
|
$keys = W3tcOAuthUtil::urlencode_rfc3986(array_keys($params));
|
|
$values = W3tcOAuthUtil::urlencode_rfc3986(array_values($params));
|
|
$params = array_combine($keys, $values);
|
|
|
|
// Parameters are sorted by name, using lexicographical byte value ordering.
|
|
// Ref: Spec: 9.1.1 (1)
|
|
uksort($params, 'strcmp');
|
|
|
|
$pairs = array();
|
|
foreach ($params as $parameter => $value) {
|
|
if (is_array($value)) {
|
|
// If two or more parameters share the same name, they are sorted by their value
|
|
// Ref: Spec: 9.1.1 (1)
|
|
// June 12th, 2010 - changed to sort because of issue 164 by hidetaka
|
|
sort($value, SORT_STRING);
|
|
foreach ($value as $duplicate_value) {
|
|
$pairs[] = $parameter . '=' .
|
|
( is_array( $duplicate_value ) ?
|
|
implode( ',', $duplicate_value ) :
|
|
$duplicate_value );
|
|
}
|
|
} else {
|
|
$pairs[] = $parameter . '=' . $value;
|
|
}
|
|
}
|
|
// For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
|
|
// Each name-value pair is separated by an '&' character (ASCII code 38)
|
|
return implode('&', $pairs);
|
|
}
|
|
}
|