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Ticket #4011: 4011.diff

File 4011.diff, 42.8 KB (added by jacobsantos, 9 years ago)

Incomplete patch for testing proxy support.

  • http.php

     
    1313 */
    1414
    1515/**
    16  * Implementation for deflate and gzip transfer encodings.
    17  *
    18  * Includes RFC 1950, RFC 1951, and RFC 1952.
    19  *
    20  * @since unknown
    21  * @package WordPress
    22  * @subpackage HTTP
    23  */
    24 class WP_Http_Encoding {
    25 
    26         /**
    27          * Compress raw string using the deflate format.
    28          *
    29          * Supports the RFC 1951 standard.
    30          *
    31          * @since unknown
    32          *
    33          * @param string $raw String to compress.
    34          * @param int $level Optional, default is 9. Compression level, 9 is highest.
    35          * @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports.
    36          * @return string|bool False on failure.
    37          */
    38         function compress( $raw, $level = 9, $supports = null ) {
    39                 return gzdeflate( $raw, $level );
    40         }
    41 
    42         /**
    43          * Decompression of deflated string.
    44          *
    45          * Will attempt to decompress using the RFC 1950 standard, and if that fails
    46          * then the RFC 1951 standard deflate will be attempted. Finally, the RFC
    47          * 1952 standard gzip decode will be attempted. If all fail, then the
    48          * original compressed string will be returned.
    49          *
    50          * @since unknown
    51          *
    52          * @param string $compressed String to decompress.
    53          * @param int $length The optional length of the compressed data.
    54          * @return string|bool False on failure.
    55          */
    56         function decompress( $compressed, $length = null ) {
    57                 $decompressed = gzinflate( $compressed );
    58 
    59                 if( false !== $decompressed )
    60                         return $decompressed;
    61 
    62                 $decompressed = gzuncompress( $compressed );
    63 
    64                 if( false !== $decompressed )
    65                         return $decompressed;
    66 
    67                 $decompressed = gzdecode( $compressed );
    68 
    69                 if( false !== $decompressed )
    70                         return $decompressed;
    71 
    72                 return $compressed;
    73         }
    74 
    75         /**
    76          * What encoding types to accept and their priority values.
    77          *
    78          * @since unknown
    79          *
    80          * @return string Types of encoding to accept.
    81          */
    82         function accept_encoding() {
    83                 $type = array();
    84                 if( function_exists( 'gzinflate' ) )
    85                         $type[] = 'deflate;q=1.0';
    86 
    87                 if( function_exists( 'gzuncompress' ) )
    88                         $type[] = 'compress;q=0.5';
    89 
    90                 if( function_exists( 'gzdecode' ) )
    91                         $type[] = 'gzip;q=0.5';
    92 
    93                 return implode(', ', $type);
    94         }
    95 
    96         /**
    97          * What enconding the content used when it was compressed to send in the headers.
    98          *
    99          * @since unknown
    100          *
    101          * @return string Content-Encoding string to send in the header.
    102          */
    103         function content_encoding() {
    104                 return 'deflate';
    105         }
    106 
    107         /**
    108          * Whether the content be decoded based on the headers.
    109          *
    110          * @since unknown
    111          *
    112          * @param array|string $headers All of the available headers.
    113          * @return bool
    114          */
    115         function should_decode($headers) {
    116                 if( is_array( $headers ) ) {
    117                         if( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) )
    118                                 return true;
    119                 } else if( is_string( $headers ) ) {
    120                         return ( stripos($headers, 'content-encoding:') !== false );
    121                 }
    122 
    123                 return false;
    124         }
    125 
    126         /**
    127          * Whether decompression and compression are supported by the PHP version.
    128          *
    129          * Each function is tested instead of checking for the zlib extension, to
    130          * ensure that the functions all exist in the PHP version and aren't
    131          * disabled.
    132          *
    133          * @since unknown
    134          *
    135          * @return bool
    136          */
    137         function is_available() {
    138                 return ( function_exists('gzuncompress') || function_exists('gzdeflate') ||
    139                                  function_exists('gzinflate') );
    140         }
    141 }
    142 
    143 /**
    14416 * WordPress HTTP Class for managing HTTP Transports and making HTTP requests.
    14517 *
    146  * This class is called for the functionality of making HTTP requests and should
    147  * replace Snoopy functionality, eventually. There is no available functionality
    148  * to add HTTP transport implementations, since most of the HTTP transports are
    149  * added and available for use.
     18 * This class is called for the functionality of making HTTP requests and should replace Snoopy
     19 * functionality, eventually. There is no available functionality to add HTTP transport
     20 * implementations, since most of the HTTP transports are added and available for use.
    15021 *
    151  * The exception is that cURL is not available as a transport and lacking an
    152  * implementation. It will be added later and should be a patch on the WordPress
    153  * Trac.
     22 * The exception is that cURL is not available as a transport and lacking an implementation. It will
     23 * be added later and should be a patch on the WordPress Trac.
    15424 *
    155  * There are no properties, because none are needed and for performance reasons.
    156  * Some of the functions are static and while they do have some overhead over
    157  * functions in PHP4, the purpose is maintainability. When PHP5 is finally the
    158  * requirement, it will be easy to add the static keyword to the code. It is not
    159  * as easy to convert a function to a method after enough code uses the old way.
     25 * There are no properties, because none are needed and for performance reasons. Some of the
     26 * functions are static and while they do have some overhead over functions in PHP4, the purpose is
     27 * maintainability. When PHP5 is finally the requirement, it will be easy to add the static keyword
     28 * to the code. It is not as easy to convert a function to a method after enough code uses the old
     29 * way.
    16030 *
    161  * Debugging includes several actions, which pass different variables for
    162  * debugging the HTTP API.
     31 * Debugging includes several actions, which pass different variables for debugging the HTTP API.
    16332 *
    164  * <strong>http_transport_get_debug</strong> - gives working, nonblocking, and
    165  * blocking transports.
     33 * <strong>http_transport_get_debug</strong> - gives working, nonblocking, and blocking transports.
    16634 *
    167  * <strong>http_transport_post_debug</strong> - gives working, nonblocking, and
    168  * blocking transports.
     35 * <strong>http_transport_post_debug</strong> - gives working, nonblocking, and blocking transports.
    16936 *
    17037 * @package WordPress
    17138 * @subpackage HTTP
     
    22895                static $working_transport, $blocking_transport, $nonblocking_transport;
    22996
    23097                if ( is_null($working_transport) ) {
    231                         if ( true === WP_Http_ExtHttp::test() && apply_filters('use_http_extension_transport', true) ) {
     98                        if ( true === WP_Http_ExtHttp::test() ) {
    23299                                $working_transport['exthttp'] = new WP_Http_ExtHttp();
    233100                                $blocking_transport[] = &$working_transport['exthttp'];
    234                         } else if ( true === WP_Http_Curl::test() && apply_filters('use_curl_transport', true) ) {
     101                        } else if ( true === WP_Http_Curl::test() ) {
    235102                                $working_transport['curl'] = new WP_Http_Curl();
    236103                                $blocking_transport[] = &$working_transport['curl'];
    237                         } else if ( true === WP_Http_Streams::test() && apply_filters('use_streams_transport', true) ) {
     104                        } else if ( true === WP_Http_Streams::test() ) {
    238105                                $working_transport['streams'] = new WP_Http_Streams();
    239106                                $blocking_transport[] = &$working_transport['streams'];
    240                         } else if ( true === WP_Http_Fopen::test() && apply_filters('use_fopen_transport', true) && ( isset($args['ssl']) && !$args['ssl'] ) ) {
     107                        } else if ( true === WP_Http_Fopen::test() && ( isset($args['ssl']) && !$args['ssl'] ) ) {
    241108                                $working_transport['fopen'] = new WP_Http_Fopen();
    242109                                $blocking_transport[] = &$working_transport['fopen'];
    243                         } else if ( true === WP_Http_Fsockopen::test() && apply_filters('use_fsockopen_transport', true) && ( isset($args['ssl']) && !$args['ssl'] ) ) {
     110                        } else if ( true === WP_Http_Fsockopen::test() && ( isset($args['ssl']) && !$args['ssl'] ) ) {
    244111                                $working_transport['fsockopen'] = new WP_Http_Fsockopen();
    245112                                $blocking_transport[] = &$working_transport['fsockopen'];
    246113                        }
     
    279146                static $working_transport, $blocking_transport, $nonblocking_transport;
    280147
    281148                if ( is_null($working_transport) ) {
    282                         if ( true === WP_Http_ExtHttp::test() && apply_filters('use_http_extension_transport', true) ) {
     149                        if ( true === WP_Http_ExtHttp::test() ) {
    283150                                $working_transport['exthttp'] = new WP_Http_ExtHttp();
    284151                                $blocking_transport[] = &$working_transport['exthttp'];
    285                         } else if ( true === WP_Http_Curl::test() && apply_filters('use_curl_transport', true) ) {
     152                        } else if ( true === WP_Http_Curl::test() ) {
    286153                                $working_transport['curl'] = new WP_Http_Curl();
    287154                                $blocking_transport[] = &$working_transport['curl'];
    288                         } else if ( true === WP_Http_Streams::test() && apply_filters('use_streams_transport', true) ) {
     155                        } else if ( true === WP_Http_Streams::test() ) {
    289156                                $working_transport['streams'] = new WP_Http_Streams();
    290157                                $blocking_transport[] = &$working_transport['streams'];
    291                         } else if ( true === WP_Http_Fsockopen::test() && apply_filters('use_fsockopen_transport', true) && ( isset($args['ssl']) && !$args['ssl'] ) ) {
     158                        } else if ( true === WP_Http_Fsockopen::test() && ( isset($args['ssl']) && !$args['ssl'] ) ) {
    292159                                $working_transport['fsockopen'] = new WP_Http_Fsockopen();
    293160                                $blocking_transport[] = &$working_transport['fsockopen'];
    294161                        }
     
    311178        /**
    312179         * Send a HTTP request to a URI.
    313180         *
    314          * The body and headers are part of the arguments. The 'body' argument is
    315          * for the body and will accept either a string or an array. The 'headers'
    316          * argument should be an array, but a string is acceptable. If the 'body'
    317          * argument is an array, then it will automatically be escaped using
    318          * http_build_query().
     181         * The body and headers are part of the arguments. The 'body' argument is for the body and will
     182         * accept either a string or an array. The 'headers' argument should be an array, but a string
     183         * is acceptable. If the 'body' argument is an array, then it will automatically be escaped
     184         * using http_build_query().
    319185         *
    320          * The only URI that are supported in the HTTP Transport implementation are
    321          * the HTTP and HTTPS protocols. HTTP and HTTPS are assumed so the server
    322          * might not know how to handle the send headers. Other protocols are
    323          * unsupported and most likely will fail.
     186         * The only URI that are supported in the HTTP Transport implementation are the HTTP and HTTPS
     187         * protocols. HTTP and HTTPS are assumed so the server might not know how to handle the send
     188         * headers. Other protocols are unsupported and most likely will fail.
    324189         *
    325          * The defaults are 'method', 'timeout', 'redirection', 'httpversion',
    326          * 'blocking' and 'user-agent'.
     190         * The defaults are 'method', 'timeout', 'redirection', 'httpversion', 'blocking' and
     191         * 'user-agent'.
    327192         *
    328          * Accepted 'method' values are 'GET', 'POST', and 'HEAD', some transports
    329          * technically allow others, but should not be assumed. The 'timeout' is
    330          * used to sent how long the connection should stay open before failing when
    331          * no response. 'redirection' is used to track how many redirects were taken
    332          * and used to sent the amount for other transports, but not all transports
     193         * Accepted 'method' values are 'GET', 'POST', and 'HEAD', some transports technically allow
     194         * others, but should not be assumed. The 'timeout' is used to sent how long the connection
     195         * should stay open before failing when no response. 'redirection' is used to track how many
     196         * redirects were taken and used to sent the amount for other transports, but not all transports
    333197         * accept setting that value.
    334198         *
    335          * The 'httpversion' option is used to sent the HTTP version and accepted
    336          * values are '1.0', and '1.1' and should be a string. Version 1.1 is not
    337          * supported, because of chunk response. The 'user-agent' option is the
    338          * user-agent and is used to replace the default user-agent, which is
     199         * The 'httpversion' option is used to sent the HTTP version and accepted values are '1.0', and
     200         * '1.1' and should be a string. Version 1.1 is not supported, because of chunk response. The
     201         * 'user-agent' option is the user-agent and is used to replace the default user-agent, which is
    339202         * 'WordPress/WP_Version', where WP_Version is the value from $wp_version.
    340203         *
    341          * 'blocking' is the default, which is used to tell the transport, whether
    342          * it should halt PHP while it performs the request or continue regardless.
    343          * Actually, that isn't entirely correct. Blocking mode really just means
    344          * whether the fread should just pull what it can whenever it gets bytes or
    345          * if it should wait until it has enough in the buffer to read or finishes
    346          * reading the entire content. It doesn't actually always mean that PHP will
    347          * continue going after making the request.
     204         * 'blocking' is the default, which is used to tell the transport, whether it should halt PHP
     205         * while it performs the request or continue regardless. Actually, that isn't entirely correct.
     206         * Blocking mode really just means whether the fread should just pull what it can whenever it
     207         * gets bytes or if it should wait until it has enough in the buffer to read or finishes reading
     208         * the entire content. It doesn't actually always mean that PHP will continue going after making
     209         * the request.
    348210         *
    349211         * @access public
    350212         * @since 2.7.0
     
    376238
    377239                $arrURL = parse_url($url);
    378240
     241                if ( $this->block_request( $url ) )
     242                        return new WP_Error('http_request_failed', 'User has blocked requests through HTTP.');
     243
    379244                // Determine if this is a https call and pass that on to the transport functions
    380245                // so that we can blacklist the transports that do not support ssl verification
    381246                if ( $arrURL['scheme'] == 'https' || $arrURL['scheme'] == 'ssl' )
     
    400265                        $r['user-agent'] = $r['headers']['user-agent'];
    401266                        unset($r['headers']['user-agent']);
    402267                }
    403                
     268
    404269                // Construct Cookie: header if any cookies are set
    405270                WP_Http::buildCookieHeader( $r );
    406271
     
    514379        /**
    515380         * Transform header string into an array.
    516381         *
    517          * If an array is given then it is assumed to be raw header data with
    518          * numeric keys with the headers as the values. No headers must be passed
    519          * that were already processed.
     382         * If an array is given then it is assumed to be raw header data with numeric keys with the
     383         * headers as the values. No headers must be passed that were already processed.
    520384         *
    521385         * @access public
    522386         * @static
     
    561425
    562426                return array('response' => $response, 'headers' => $newheaders, 'cookies' => $cookies);
    563427        }
    564        
     428
    565429        /**
    566430         * Takes the arguments for a ::request() and checks for the cookie array.
    567          * If it's found, then it's assumed to contain WP_Http_Cookie objects, which
    568          * are each parsed into strings and added to the Cookie: header (within the
    569          * arguments array). Edits the array by reference.
    570431         *
     432         * If it's found, then it's assumed to contain WP_Http_Cookie objects, which are each parsed
     433         * into strings and added to the Cookie: header (within the arguments array). Edits the array by
     434         * reference.
     435         *
    571436         * @access public
     437         * @version 2.8.0
    572438         * @static
    573439         *
    574440         * @param array $r Full array of args passed into ::request()
     
    583449                        $r['headers']['cookie'] = $cookies_header;
    584450                }
    585451        }
    586        
     452
    587453        /**
    588454         * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification.
    589455         *
    590          * Based off the HTTP http_encoding_dechunk function. Does not support
    591          * UTF-8. Does not support returning footer headers. Shouldn't be too
    592          * difficult to support it though.
     456         * Based off the HTTP http_encoding_dechunk function. Does not support UTF-8. Does not support
     457         * returning footer headers. Shouldn't be too difficult to support it though.
    593458         *
    594459         * @todo Add support for footer chunked headers.
    595460         * @access public
     
    630495                        }
    631496                }
    632497        }
     498
     499        /**
     500         * Block requests through the proxy.
     501         *
     502         * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will
     503         * prevent plugins from working and core functionality, if you don't include api.wordpress.org.
     504         *
     505         * You block external URL requests by defining WP_HTTP_BLOCK_EXTERNAL in your wp-config.php file
     506         * and this will only allow localhost and your blog to make requests. The constant
     507         * WP_ACCESSABLE_HOSTS will allow additional hosts to go through for requests.
     508         *
     509         * @since unknown
     510         * @link http://core.trac.wordpress.org/ticket/8927 Allow preventing external requests.
     511         *
     512         * @param string $uri URI of url.
     513         * @return bool True to block, false to allow.
     514         */
     515        function block_request($uri) {
     516                // We don't need to block requests, because nothing is blocked.
     517                if ( ! defined('WP_HTTP_BLOCK_EXTERNAL') || ( defined('WP_HTTP_BLOCK_EXTERNAL') && WP_HTTP_BLOCK_EXTERNAL == false ) )
     518                        return false;
     519
     520                // parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.
     521                // This will be displayed on blogs, which is not reasonable.
     522                $check = @parse_url($uri);
     523
     524                /* Malformed URL, can not process, but this could mean ssl, so let through anyway.
     525                 *
     526                 * This isn't very security sound. There are instances where a hacker might attempt
     527                 * to bypass the proxy and this check. However, the reason for this behavior is that
     528                 * WordPress does not do any checking currently for non-proxy requests, so it is keeps with
     529                 * the default unsecure nature of the HTTP request.
     530                 */
     531                if ( $check === false )
     532                        return false;
     533
     534                $home = parse_url( get_bloginfo('site_url') );
     535
     536                if ( $uri == 'localhost' || $uri == $home['host'] )
     537                        return false;
     538
     539                if ( defined('WP_ACCESSABLE_HOSTS') && is_array( WP_ACCESSABLE_HOSTS ) && in_array( $check['host'], WP_ACCESSABLE_HOSTS ) ) {
     540                                return false;
     541                }
     542
     543                return true;
     544        }
    633545}
    634546
    635547/**
    636548 * HTTP request method uses fsockopen function to retrieve the url.
    637549 *
    638  * This would be the preferred method, but the fsockopen implementation has the
    639  * most overhead of all the HTTP transport implementations.
     550 * This would be the preferred method, but the fsockopen implementation has the most overhead of all
     551 * the HTTP transport implementations.
    640552 *
    641553 * @package WordPress
    642554 * @subpackage HTTP
     
    696608                        $arrURL['port'] = apply_filters('http_request_port', $arrURL['port']);
    697609                }
    698610
    699                 // There are issues with the HTTPS and SSL protocols that cause errors
    700                 // that can be safely ignored and should be ignored.
     611                // There are issues with the HTTPS and SSL protocols that cause errors that can be safely
     612                // ignored and should be ignored.
    701613                if ( true === $secure_transport )
    702614                        $error_reporting = error_reporting(0);
    703615
     
    710622
    711623                $endDelay = time();
    712624
    713                 // If the delay is greater than the timeout then fsockopen should't be
    714                 // used, because it will cause a long delay.
     625                // If the delay is greater than the timeout then fsockopen should't be used, because it will
     626                // cause a long delay.
    715627                $elapseDelay = ($endDelay-$startDelay) > $r['timeout'];
    716628                if ( true === $elapseDelay )
    717629                        add_option( 'disable_fsockopen', $endDelay, null, true );
     
    719631                if ( false === $handle )
    720632                        return new WP_Error('http_request_failed', $iError . ': ' . $strError);
    721633
    722                 // WordPress supports PHP 4.3, which has this function. Removed sanity
    723                 // checking for performance reasons.
     634                // WordPress supports PHP 4.3, which has this function. Removed sanity checking for
     635                // performance reasons.
    724636                stream_set_timeout($handle, $r['timeout'] );
    725637
    726638                $requestPath = $arrURL['path'] . ( isset($arrURL['query']) ? '?' . $arrURL['query'] : '' );
     
    798710                if ( false !== ($option = get_option( 'disable_fsockopen' )) && time()-$option < 43200 ) // 12 hours
    799711                        return false;
    800712
    801                 if ( function_exists( 'fsockopen' ) )
     713                if ( function_exists( 'fsockopen' ) && apply_filters('use_fsockopen_transport', true) )
    802714                        return true;
    803715
    804716                return false;
     
    808720/**
    809721 * HTTP request method uses fopen function to retrieve the url.
    810722 *
    811  * Requires PHP version greater than 4.3.0 for stream support. Does not allow
    812  * for $context support, but should still be okay, to write the headers, before
    813  * getting the response. Also requires that 'allow_url_fopen' to be enabled.
     723 * Requires PHP version greater than 4.3.0 for stream support. Does not allow for $context support,
     724 * but should still be okay, to write the headers, before getting the response. Also requires that
     725 * 'allow_url_fopen' to be enabled.
    814726 *
    815727 * @package WordPress
    816728 * @subpackage HTTP
     
    820732        /**
    821733         * Send a HTTP request to a URI using fopen().
    822734         *
    823          * This transport does not support sending of headers and body, therefore
    824          * should not be used in the instances, where there is a body and headers.
     735         * This transport does not support sending of headers and body, therefore should not be used in
     736         * the instances, where there is a body and headers.
    825737         *
    826738         * Notes: Does not support non-blocking mode. Ignores 'redirection' option.
    827739         *
     
    911823                if ( ! function_exists('fopen') || (function_exists('ini_get') && true != ini_get('allow_url_fopen')) )
    912824                        return false;
    913825
    914                 return true;
     826                return apply_filters('use_fopen_transport', true);
    915827        }
    916828}
    917829
    918830/**
    919831 * HTTP request method uses Streams to retrieve the url.
    920832 *
    921  * Requires PHP 5.0+ and uses fopen with stream context. Requires that
    922  * 'allow_url_fopen' PHP setting to be enabled.
     833 * Requires PHP 5.0+ and uses fopen with stream context. Requires that 'allow_url_fopen' PHP setting
     834 * to be enabled.
    923835 *
    924836 * Second preferred method for getting the URL, for PHP 5.
    925837 *
     
    955867                        $r['user-agent'] = $r['headers']['user-agent'];
    956868                        unset($r['headers']['user-agent']);
    957869                }
    958                
     870
    959871                // Construct Cookie: header if any cookies are set
    960872                WP_Http::buildCookieHeader( $r );
    961873
     
    984896                                'header' => $strHeaders,
    985897                                'timeout' => $r['timeout'],
    986898                                'ssl' => array(
    987                                         'verify_peer' => apply_filters('https_ssl_verify', $r['sslverify']),
    988                                         'verify_host' => apply_filters('https_ssl_verify', $r['sslverify'])
    989                                 )
     899                                                'verify_peer' => apply_filters('https_ssl_verify', $r['sslverify']),
     900                                                'verify_host' => apply_filters('https_ssl_verify', $r['sslverify'])
     901                                )
    990902                        )
    991903                );
    992904
     905                $proxy = new WP_HTTP_Proxy();
     906
     907                if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
     908                        // WTF happens when the user stupidly puts http:// in the host? Bad things. Really,
     909                        // really bad things happen. Not exactly unleashing demons from hell, but you know.
     910                        // Just as bad probably. Actually, none of the other transports should work in that case
     911                        // so no sanitization is done. If there is, it should be done in the
     912                        // WP_HTTP_Proxy::host().
     913                        //
     914                        // On second thought, why is it tcp protocol? Why not http? What if the proxy is http
     915                        // and not tcp? Even though, technically, http is tcp, but just a specialized form of
     916                        // tcp. Behavior is undefined, so it is probably good that not a lot of users will be
     917                        // affected by FUBAR behavior.
     918                        //
     919                        // Is it another WTF? that this multiline comment isn't using multiline comment syntax?
     920                        $arrContext['http']['proxy'] = 'tcp://'.$proxy->host().':'$proxy->port();
     921
     922                        // Yeah, this may or may not work. Good luck.
     923                        if ( $proxy->use_authentication() ) {
     924                                $arrContext['http']['header'] .= $proxy->authentication_header() . "\r\n";
     925                        }
     926                }
     927
    993928                if ( ! is_null($r['body']) && ! empty($r['body'] ) )
    994929                        $arrContext['http']['content'] = $r['body'];
    995930
     
    1003938                if ( ! $handle)
    1004939                        return new WP_Error('http_request_failed', sprintf(__('Could not open handle for fopen() to %s'), $url));
    1005940
    1006                 // WordPress supports PHP 4.3, which has this function. Removed sanity
    1007                 // checking for performance reasons.
     941                // WordPress supports PHP 4.3, which has this function. Removed sanity checking for
     942                // performance reasons.
    1008943                stream_set_timeout($handle, $r['timeout'] );
    1009944
    1010945                if ( ! $r['blocking'] ) {
     
    1049984                if ( version_compare(PHP_VERSION, '5.0', '<') )
    1050985                        return false;
    1051986
    1052                 return true;
     987                return apply_filters('use_streams_transport', true);
    1053988        }
    1054989}
    1055990
    1056991/**
    1057992 * HTTP request method uses HTTP extension to retrieve the url.
    1058993 *
    1059  * Requires the HTTP extension to be installed. This would be the preferred
    1060  * transport since it can handle a lot of the problems that forces the others to
    1061  * use the HTTP version 1.0. Even if PHP 5.2+ is being used, it doesn't mean
    1062  * that the HTTP extension will be enabled.
     994 * Requires the HTTP extension to be installed. This would be the preferred transport since it can
     995 * handle a lot of the problems that forces the others to use the HTTP version 1.0. Even if PHP 5.2+
     996 * is being used, it doesn't mean that the HTTP extension will be enabled.
    1063997 *
    1064998 * @package WordPress
    1065999 * @subpackage HTTP
     
    10951029                        $r['user-agent'] = $r['headers']['user-agent'];
    10961030                        unset($r['headers']['user-agent']);
    10971031                }
    1098                
     1032
    10991033                // Construct Cookie: header if any cookies are set
    11001034                WP_Http::buildCookieHeader( $r );
    11011035
     
    11281062                        )
    11291063                );
    11301064
     1065                // The HTTP extensions offers really easy proxy support.
     1066                $proxy = new WP_HTTP_Proxy();
     1067
     1068                if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
     1069                        $options['proxyhost'] = $proxy->host();
     1070                        $options['proxyport'] = $proxy->port();
     1071                        $options['proxytype'] = HTTP_PROXY_HTTP;
     1072
     1073                        if ( $proxy->use_authentication() ) {
     1074                                $options['proxyauth'] = $proxy->authentication();
     1075                                $options['proxyauthtype'] = HTTP_AUTH_BASIC;
     1076                        }
     1077                }
     1078
    11311079                if ( !defined('WP_DEBUG') || ( defined('WP_DEBUG') && false === WP_DEBUG ) ) //Emits warning level notices for max redirects and timeouts
    11321080                        $strResponse = @http_request($r['method'], $url, $r['body'], $options, $info);
    11331081                else
    11341082                        $strResponse = http_request($r['method'], $url, $r['body'], $options, $info); //Emits warning level notices for max redirects and timeouts
    11351083
    1136                 if ( false === $strResponse || ! empty($info['error']) ) //Error may still be set, Response may return headers or partial document, and error contains a reason the request was aborted, eg, timeout expired or max-redirects reached
     1084                // Error may still be set, Response may return headers or partial document, and error
     1085                // contains a reason the request was aborted, eg, timeout expired or max-redirects reached.
     1086                if ( false === $strResponse || ! empty($info['error']) )
    11371087                        return new WP_Error('http_request_failed', $info['response_code'] . ': ' . $info['error']);
    11381088
    11391089                if ( ! $r['blocking'] )
     
    11681118         * @return boolean False means this class can not be used, true means it can.
    11691119         */
    11701120        function test() {
    1171                 if ( function_exists('http_request') )
     1121                if ( function_exists('http_request') && apply_filters('use_http_extension_transport', true) )
    11721122                        return true;
    11731123
    11741124                return false;
     
    11851135 * @since 2.7
    11861136 */
    11871137class WP_Http_Curl {
     1138
    11881139        /**
    11891140         * Send a HTTP request to a URI using cURL extension.
    11901141         *
     
    12121163                        $r['user-agent'] = $r['headers']['user-agent'];
    12131164                        unset($r['headers']['user-agent']);
    12141165                }
    1215                
    1216                 // Construct Cookie: header if any cookies are set
     1166
     1167                // Construct Cookie: header if any cookies are set.
    12171168                WP_Http::buildCookieHeader( $r );
    12181169
    1219                 // cURL extension will sometimes fail when the timeout is less than 1 as
    1220                 // it may round down to 0, which gives it unlimited timeout.
     1170                // cURL extension will sometimes fail when the timeout is less than 1 as it may round down
     1171                // to 0, which gives it unlimited timeout.
    12211172                if ( $r['timeout'] > 0 && $r['timeout'] < 1 )
    12221173                        $r['timeout'] = 1;
    12231174
    12241175                $handle = curl_init();
    12251176
     1177                // cURL offers really easy proxy support.
     1178                $proxy = new WP_HTTP_Proxy();
     1179
     1180                if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
     1181                        curl_setopt( $handle, CURLOPT_HTTPPROXYTUNNEL, true );
     1182
     1183                        $isPHP5 = version_compare(PHP_VERSION, '5.0.0', '>=');
     1184
     1185                        if ( $isPHP5 ) {
     1186                                curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP );
     1187                                curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() );
     1188                                curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() );
     1189                        } else {
     1190                                curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() .':'. $proxy->port() );
     1191                        }
     1192
     1193                        if ( $proxy->use_authentication() ) {
     1194                                if ( $isPHP5 )
     1195                                        curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_BASIC );
     1196
     1197                                curl_setopt( $handle, CURLOPT_PROXYUSERPWD, $proxy->authentication() );
     1198                        }
     1199                }
     1200
    12261201                curl_setopt( $handle, CURLOPT_URL, $url);
    12271202                curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true );
    12281203                curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, apply_filters('https_ssl_verify', $r['sslverify']) );
     
    12651240                else
    12661241                        curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 );
    12671242
    1268                 // Cookies are not handled by the HTTP API currently. Allow for plugin
    1269                 // authors to handle it themselves... Although, it is somewhat pointless
    1270                 // without some reference.
     1243                // Cookies are not handled by the HTTP API currently. Allow for plugin authors to handle it
     1244                // themselves... Although, it is somewhat pointless without some reference.
    12711245                do_action_ref_array( 'http_api_curl', array(&$handle) );
    12721246
    1273                 // We don't need to return the body, so don't. Just execute request
    1274                 // and return.
     1247                // We don't need to return the body, so don't. Just execute request and return.
    12751248                if ( ! $r['blocking'] ) {
    12761249                        curl_exec( $handle );
    12771250                        curl_close( $handle );
     
    13201293         * @return boolean False means this class can not be used, true means it can.
    13211294         */
    13221295        function test() {
    1323                 if ( function_exists('curl_init') && function_exists('curl_exec') )
     1296                if ( function_exists('curl_init') && function_exists('curl_exec') && apply_filters('use_curl_transport', true) )
    13241297                        return true;
    13251298
    13261299                return false;
    13271300        }
    13281301}
    13291302
     1303/**
     1304 * Adds Proxy support to the WordPress HTTP API.
     1305 *
     1306 * Proxy support is fringe enough that it isn't support in WordPress by default, meaning no plans
     1307 * were made to implement it. Most WordPress users are not going to benefit with its support, but
     1308 * enough people have made a stink out of the lack of it that it should be supported.
     1309 *
     1310 * There are caveats to proxy support. It requires that defines be made in the wp-config.php file to
     1311 * enable proxy support. There are also a few filters that plugins can hook into for some of the
     1312 * constants.
     1313 *
     1314 * The constants are as follows:
     1315 * <ol>
     1316 * <li>WP_PROXY_HOST - Enable proxy support and host for connecting.</li>
     1317 * <li>WP_PROXY_PORT - Proxy port for connection. No default, must be defined.</li>
     1318 * <li>WP_PROXY_USERNAME - Proxy username, if it requires authentication.</li>
     1319 * <li>WP_PROXY_PASSWORD - Proxy password, if it requires authentication.</li>
     1320 * <li>WP_PROXY_BYPASS_HOSTS - Will prevent the hosts in this list from going through the proxy.
     1321 * You do not need to have localhost and the blog host in this list, because they will not be passed
     1322 * through the proxy.</li>
     1323 * </ol>
     1324 *
     1325 * An example can be as seen below.
     1326 * <code>
     1327 * define('WP_PROXY_HOST', '192.168.84.101');
     1328 * define('WP_PROXY_PORT', '8080');
     1329 * define('WP_PROXY_BYPASS_HOSTS', array('localhost', 'www.example.com'));
     1330 * </code>
     1331 *
     1332 * @link http://core.trac.wordpress.org/ticket/4011 Proxy support ticket in WordPress.
     1333 * @since unknown
     1334 */
     1335class WP_HTTP_Proxy {
    13301336
     1337        function WP_HTTP_Proxy() {
     1338                $this->__construct();
     1339        }
     1340
     1341        function __construct() {
     1342               
     1343        }
     1344
     1345        /**
     1346         * Whether proxy connection should be used.
     1347         *
     1348         * @since unknown
     1349         * @use WP_PROXY_HOST
     1350         * @use WP_PROXY_PORT
     1351         *
     1352         * @return bool
     1353         */
     1354        function is_enabled() {
     1355                return ( defined('WP_PROXY_HOST') && defined('WP_PROXY_PORT') );
     1356        }
     1357
     1358        /**
     1359         * Whether authentication should be used.
     1360         *
     1361         * @since unknown
     1362         * @use WP_PROXY_USERNAME
     1363         * @use WP_PROXY_PASSWORD
     1364         *
     1365         * @return bool
     1366         */
     1367        function use_authentication() {
     1368                return ( defined('WP_PROXY_USERNAME') && defined('WP_PROXY_PASSWORD') );
     1369        }
     1370
     1371        /**
     1372         * Retrieve the host for the proxy server.
     1373         *
     1374         * @since unknown
     1375         *
     1376         * @return string
     1377         */
     1378        function host()
     1379        {
     1380                if( defined('WP_PROXY_HOST') )
     1381                        return WP_PROXY_HOST;
     1382
     1383                return '';
     1384        }
     1385
     1386        /**
     1387         * Retrieve the port for the proxy server.
     1388         *
     1389         * @since unknown
     1390         *
     1391         * @return string
     1392         */
     1393        function port()
     1394        {
     1395                if( defined('WP_PROXY_PORT') )
     1396                        return WP_PROXY_PORT;
     1397
     1398                return '';
     1399        }
     1400
     1401        /**
     1402         * Retrieve the username for proxy authentication.
     1403         *
     1404         * @since unknown
     1405         *
     1406         * @return string
     1407         */
     1408        function username()
     1409        {
     1410                if( defined('WP_PROXY_USERNAME') )
     1411                        return WP_PROXY_USERNAME;
     1412
     1413                return '';
     1414        }
     1415
     1416        /**
     1417         * Retrieve the password for proxy authentication.
     1418         *
     1419         * @since unknown
     1420         *
     1421         * @return string
     1422         */
     1423        function password()
     1424        {
     1425                if( defined('WP_PROXY_PASSWORD') )
     1426                        return WP_PROXY_PASSWORD;
     1427
     1428                return '';
     1429        }
     1430
     1431        /**
     1432         * Retrieve authentication string for proxy authentication.
     1433         *
     1434         * @since unknown
     1435         *
     1436         * @return string
     1437         */
     1438        function authentication() {
     1439                return $this->username() .':'. $this->password();
     1440        }
     1441
     1442        /**
     1443         * Retrieve header string for proxy authentication.
     1444         *
     1445         * @since unknown
     1446         *
     1447         * @return string
     1448         */
     1449        function authentication_header() {
     1450                return 'Proxy-Authentication: Basic '. base64_encode( $this->authentication() );
     1451        }
     1452
     1453        /**
     1454         * Whether URL should be sent through the proxy server.
     1455         *
     1456         * We want to keep localhost and the blog URL from being sent through the proxy server, because
     1457         * some proxies can not handle this. We also have the constant available for defining other
     1458         * hosts that won't be sent through the proxy.
     1459         *
     1460         * @uses WP_PROXY_BYPASS_HOSTS
     1461         * @since unknown
     1462         *
     1463         * @param string $uri URI to check.
     1464         * @return bool True, to send through the proxy and false if, the proxy should not be used.
     1465         */
     1466        function send_through_proxy( $uri ) {
     1467                // parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.
     1468                // This will be displayed on blogs, which is not reasonable.
     1469                $check = @parse_url($uri);
     1470
     1471                // Malformed URL, can not process, but this could mean ssl, so let through anyway.
     1472                if( $check === false )
     1473                        return true;
     1474
     1475                $home = parse_url( get_bloginfo('site_url') );
     1476
     1477                if ( $uri == 'localhost' || $uri == $home['host'] )
     1478                        return false;
     1479
     1480                if ( defined('WP_PROXY_BYPASS_HOSTS') && is_array( WP_PROXY_BYPASS_HOSTS ) && in_array( $check['host'], WP_PROXY_BYPASS_HOSTS ) ) {
     1481                                return false;
     1482                }
     1483
     1484                return true;
     1485        }
     1486}
     1487
     1488
    13311489/**
    1332  * Internal representation of a cookie.
     1490 * Internal representation of a single cookie.
    13331491 *
    1334  * Returned cookies are represented using this class, and when cookies are
    1335  * set, if they are not already a WP_Http_Cookie() object, then they are turned
    1336  * into one.
     1492 * Returned cookies are represented using this class, and when cookies are set, if they are not
     1493 * already a WP_Http_Cookie() object, then they are turned into one.
    13371494 *
     1495 * @todo The WordPress convention is to use underscores instead of camelCase for function and method
     1496 * names. Need to switch to use underscores instead for the methods.
     1497 *
    13381498 * @package WordPress
    13391499 * @subpackage HTTP
     1500 * @since 2.8.0
     1501 * @author Beau Lebens
    13401502 */
    13411503class WP_Http_Cookie {
    1342         var $name,
    1343                 $value,
    1344                 $expires,
    1345                 $path,
    1346                 $domain;
    1347        
     1504
    13481505        /**
    1349          * PHP4 style Constructor - Calls PHP5 Style Constructor
     1506         * Cookie name.
     1507         *
     1508         * @since 2.8.0
     1509         * @var string
    13501510         */
     1511        var $name;
     1512
     1513        /**
     1514         * Cookie value.
     1515         *
     1516         * @since 2.8.0
     1517         * @var string
     1518         */
     1519        var $value;
     1520
     1521        /**
     1522         * When the cookie expires.
     1523         *
     1524         * @since 2.8.0
     1525         * @var string
     1526         */
     1527        var $expires;
     1528
     1529        /**
     1530         * Cookie URL path.
     1531         *
     1532         * @since 2.8.0
     1533         * @var string
     1534         */
     1535        var $path;
     1536
     1537        /**
     1538         * Cookie Domain.
     1539         *
     1540         * @since 2.8.0
     1541         * @var string
     1542         */
     1543        var $domain;
     1544
     1545        /**
     1546         * PHP4 style Constructor - Calls PHP5 Style Constructor.
     1547         *
     1548         * @access public
     1549         * @since 2.8.0
     1550         * @param string|array $data Raw cookie data.
     1551         */
    13511552        function WP_Http_Cookie( $data ) {
    1352                 return $this->__construct( $data );
     1553                $this->__construct( $data );
    13531554        }
    1354        
     1555
    13551556        /**
    13561557         * Sets up this cookie object.
    13571558         *
     1559         * The parameter $data should be either an associative array containing the indices names below
     1560         * or a header string detailing it.
     1561         *
     1562         * If it's an array, it should include the following elements:
     1563         * <ol>
     1564         * <li>Name</li>
     1565         * <li>Value - should NOT be urlencoded already.</li>
     1566         * <li>Expires - (optional) String or int (UNIX timestamp).</li>
     1567         * <li>Path (optional)</li>
     1568         * <li>Domain (optional)</li>
     1569         * </ol>
     1570         *
    13581571         * @access public
     1572         * @since 2.8.0
    13591573         *
    1360          * @param mixed $data Either an associative array describing the cookie, or a header-string detailing it.
    1361          *              If it's an array, it should include the following elements:
    1362          *                      - name
    1363          *                      - value [should NOT be urlencoded already]
    1364          *                      - expires (optional) String or int (UNIX timestamp)
    1365          *                      - path (optional)
    1366          *                      - domain (optional)
     1574         * @param string|array $data Raw cookie data.
    13671575         */
    13681576        function __construct( $data ) {
    13691577                if ( is_string( $data ) ) {
    13701578                        // Assume it's a header string direct from a previous request
    13711579                        $pairs = explode( ';', $data );
    1372                        
     1580
    13731581                        // Special handling for first pair; name=value. Also be careful of "=" in value
    13741582                        $name  = trim( substr( $pairs[0], 0, strpos( $pairs[0], '=' ) ) );
    13751583                        $value = substr( $pairs[0], strpos( $pairs[0], '=' ) + 1 );
    13761584                        $this->name  = $name;
    13771585                        $this->value = urldecode( $value );
    13781586                        array_shift( $pairs ); //Removes name=value from items.
    1379                        
     1587
    13801588                        // Set everything else as a property
    13811589                        foreach ( $pairs as $pair ) {
    13821590                                if ( empty($pair) ) //Handles the cookie ending in ; which results in a empty final pair
    13831591                                        continue;
     1592
    13841593                                list( $key, $val ) = explode( '=', $pair );
    13851594                                $key = strtolower( trim( $key ) );
    13861595                                if ( 'expires' == $key )
     
    13901599                } else {
    13911600                        if ( !isset( $data['name'] ) )
    13921601                                return false;
    1393                        
     1602
    13941603                        // Set properties based directly on parameters
    13951604                        $this->name   = $data['name'];
    13961605                        $this->value  = isset( $data['value'] ) ? $data['value'] : '';
    13971606                        $this->path   = isset( $data['path'] ) ? $data['path'] : '';
    13981607                        $this->domain = isset( $data['domain'] ) ? $data['domain'] : '';
     1608
    13991609                        if ( isset( $data['expires'] ) )
    14001610                                $this->expires = is_int( $data['expires'] ) ? $data['expires'] : strtotime( $data['expires'] );
    14011611                        else
    14021612                                $this->expires = null;
    14031613                }
    14041614        }
    1405        
     1615
    14061616        /**
    14071617         * Confirms that it's OK to send this cookie to the URL checked against.
    14081618         *
    14091619         * Decision is based on RFC 2109/2965, so look there for details on validity.
    14101620         *
    14111621         * @access public
     1622         * @since 2.8.0
    14121623         *
    14131624         * @param string $url URL you intend to send this cookie to
    14141625         * @return boolean TRUE if allowed, FALSE otherwise.
     
    14171628                // Expires - if expired then nothing else matters
    14181629                if ( time() > $this->expires )
    14191630                        return false;
    1420                
     1631
    14211632                // Get details on the URL we're thinking about sending to
    14221633                $url = parse_url( $url );
    14231634                $url['port'] = isset( $url['port'] ) ? $url['port'] : 80;
    14241635                $url['path'] = isset( $url['path'] ) ? $url['path'] : '/';
    1425                
    1426                  // Values to use for comparison against the URL
     1636
     1637                // Values to use for comparison against the URL
    14271638                $path   = isset( $this->path )   ? $this->path   : '/';
    14281639                $port   = isset( $this->port )   ? $this->port   : 80;
    14291640                $domain = isset( $this->domain ) ? strtolower( $this->domain ) : strtolower( $url['host'] );
    14301641                if ( false === stripos( $domain, '.' ) )
    14311642                        $domain .= '.local';
    1432                
     1643
    14331644                // Host - very basic check that the request URL ends with the domain restriction (minus leading dot)
    14341645                $domain = substr( $domain, 0, 1 ) == '.' ? substr( $domain, 1 ) : $domain;
    14351646                if ( substr( $url['host'], -strlen( $domain ) ) != $domain )
    14361647                        return false;
    1437                
     1648
    14381649                // Port - supports "port-lists" in the format: "80,8000,8080"
    14391650                if ( !in_array( $url['port'], explode( ',', $port) ) )
    14401651                        return false;
    1441                
     1652
    14421653                // Path - request path must start with path restriction
    14431654                if ( substr( $url['path'], 0, strlen( $path ) ) != $path )
    14441655                        return false;
    1445                
     1656
    14461657                return true;
    14471658        }
    1448        
     1659
     1660        /**
     1661         * Convert cookie name and value back to header string.
     1662         *
     1663         * @access public
     1664         * @since 2.8.0
     1665         *
     1666         * @return string Header encoded cookie name and value.
     1667         */
    14491668        function getHeaderValue() {
    14501669                if ( empty( $this->name ) || empty( $this->value ) )
    14511670                        return '';
    14521671               
    14531672                return $this->name . '=' . urlencode( $this->value );
    14541673        }
    1455        
     1674
     1675        /**
     1676         * Retrieve cookie header for usage in the rest of the WordPress HTTP API.
     1677         *
     1678         * @access public
     1679         * @since 2.8.0
     1680         *
     1681         * @return string
     1682         */
    14561683        function getFullHeader() {
    14571684                return 'Cookie: ' . $this->getHeaderValue();
    14581685        }
    14591686}
    14601687
    14611688/**
     1689 * Implementation for deflate and gzip transfer encodings.
     1690 *
     1691 * Includes RFC 1950, RFC 1951, and RFC 1952.
     1692 *
     1693 * @since 2.8
     1694 * @package WordPress
     1695 * @subpackage HTTP
     1696 */
     1697class WP_Http_Encoding {
     1698
     1699        /**
     1700         * Compress raw string using the deflate format.
     1701         *
     1702         * Supports the RFC 1951 standard.
     1703         *
     1704         * @since 2.8
     1705         *
     1706         * @param string $raw String to compress.
     1707         * @param int $level Optional, default is 9. Compression level, 9 is highest.
     1708         * @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports.
     1709         * @return string|bool False on failure.
     1710         */
     1711        function compress( $raw, $level = 9, $supports = null ) {
     1712                return gzdeflate( $raw, $level );
     1713        }
     1714
     1715        /**
     1716         * Decompression of deflated string.
     1717         *
     1718         * Will attempt to decompress using the RFC 1950 standard, and if that fails
     1719         * then the RFC 1951 standard deflate will be attempted. Finally, the RFC
     1720         * 1952 standard gzip decode will be attempted. If all fail, then the
     1721         * original compressed string will be returned.
     1722         *
     1723         * @since 2.8
     1724         *
     1725         * @param string $compressed String to decompress.
     1726         * @param int $length The optional length of the compressed data.
     1727         * @return string|bool False on failure.
     1728         */
     1729        function decompress( $compressed, $length = null ) {
     1730                $decompressed = gzinflate( $compressed );
     1731
     1732                if( false !== $decompressed )
     1733                        return $decompressed;
     1734
     1735                $decompressed = gzuncompress( $compressed );
     1736
     1737                if( false !== $decompressed )
     1738                        return $decompressed;
     1739
     1740                $decompressed = gzdecode( $compressed );
     1741
     1742                if( false !== $decompressed )
     1743                        return $decompressed;
     1744
     1745                return $compressed;
     1746        }
     1747
     1748        /**
     1749         * What encoding types to accept and their priority values.
     1750         *
     1751         * @since 2.8
     1752         *
     1753         * @return string Types of encoding to accept.
     1754         */
     1755        function accept_encoding() {
     1756                $type = array();
     1757                if( function_exists( 'gzinflate' ) )
     1758                        $type[] = 'deflate;q=1.0';
     1759
     1760                if( function_exists( 'gzuncompress' ) )
     1761                        $type[] = 'compress;q=0.5';
     1762
     1763                if( function_exists( 'gzdecode' ) )
     1764                        $type[] = 'gzip;q=0.5';
     1765
     1766                return implode(', ', $type);
     1767        }
     1768
     1769        /**
     1770         * What enconding the content used when it was compressed to send in the headers.
     1771         *
     1772         * @since 2.8
     1773         *
     1774         * @return string Content-Encoding string to send in the header.
     1775         */
     1776        function content_encoding() {
     1777                return 'deflate';
     1778        }
     1779
     1780        /**
     1781         * Whether the content be decoded based on the headers.
     1782         *
     1783         * @since 2.8
     1784         *
     1785         * @param array|string $headers All of the available headers.
     1786         * @return bool
     1787         */
     1788        function should_decode($headers) {
     1789                if( is_array( $headers ) ) {
     1790                        if( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) )
     1791                                return true;
     1792                } else if( is_string( $headers ) ) {
     1793                        return ( stripos($headers, 'content-encoding:') !== false );
     1794                }
     1795
     1796                return false;
     1797        }
     1798
     1799        /**
     1800         * Whether decompression and compression are supported by the PHP version.
     1801         *
     1802         * Each function is tested instead of checking for the zlib extension, to
     1803         * ensure that the functions all exist in the PHP version and aren't
     1804         * disabled.
     1805         *
     1806         * @since 2.8
     1807         *
     1808         * @return bool
     1809         */
     1810        function is_available() {
     1811                return ( function_exists('gzuncompress') || function_exists('gzdeflate') ||
     1812                                 function_exists('gzinflate') );
     1813        }
     1814}
     1815
     1816/**
    14621817 * Returns the initialized WP_Http Object
    14631818 *
    14641819 * @since 2.7.0