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Edit File : class-http.php \| Size : 36.22 KB
<?php /** * HTTP API: WP_Http class * * @package WordPress * @subpackage HTTP * @since 2.7.0 / if ( ! class_exists( 'Requests' ) ) { require( ABSPATH . WPINC . '/class-requests.php' ); Requests::register_autoloader(); Requests::set_certificate_path( ABSPATH . WPINC . '/certificates/ca-bundle.crt' ); } /* * Core class used for managing HTTP transports and making HTTP requests. * * This class is used to consistently make outgoing HTTP requests easy for developers * while still being compatible with the many PHP configurations under which * WordPress runs. * * Debugging includes several actions, which pass different variables for debugging the HTTP API. * * @since 2.7.0 / class WP_Http { // Aliases for HTTP response codes. const HTTP_CONTINUE = 100; const SWITCHING_PROTOCOLS = 101; const PROCESSING = 102; const EARLY_HINTS = 103; const OK = 200; const CREATED = 201; const ACCEPTED = 202; const NON_AUTHORITATIVE_INFORMATION = 203; const NO_CONTENT = 204; const RESET_CONTENT = 205; const PARTIAL_CONTENT = 206; const MULTI_STATUS = 207; const IM_USED = 226; const MULTIPLE_CHOICES = 300; const MOVED_PERMANENTLY = 301; const FOUND = 302; const SEE_OTHER = 303; const NOT_MODIFIED = 304; const USE_PROXY = 305; const RESERVED = 306; const TEMPORARY_REDIRECT = 307; const PERMANENT_REDIRECT = 308; const BAD_REQUEST = 400; const UNAUTHORIZED = 401; const PAYMENT_REQUIRED = 402; const FORBIDDEN = 403; const NOT_FOUND = 404; const METHOD_NOT_ALLOWED = 405; const NOT_ACCEPTABLE = 406; const PROXY_AUTHENTICATION_REQUIRED = 407; const REQUEST_TIMEOUT = 408; const CONFLICT = 409; const GONE = 410; const LENGTH_REQUIRED = 411; const PRECONDITION_FAILED = 412; const REQUEST_ENTITY_TOO_LARGE = 413; const REQUEST_URI_TOO_LONG = 414; const UNSUPPORTED_MEDIA_TYPE = 415; const REQUESTED_RANGE_NOT_SATISFIABLE = 416; const EXPECTATION_FAILED = 417; const IM_A_TEAPOT = 418; const MISDIRECTED_REQUEST = 421; const UNPROCESSABLE_ENTITY = 422; const LOCKED = 423; const FAILED_DEPENDENCY = 424; const UPGRADE_REQUIRED = 426; const PRECONDITION_REQUIRED = 428; const TOO_MANY_REQUESTS = 429; const REQUEST_HEADER_FIELDS_TOO_LARGE = 431; const UNAVAILABLE_FOR_LEGAL_REASONS = 451; const INTERNAL_SERVER_ERROR = 500; const NOT_IMPLEMENTED = 501; const BAD_GATEWAY = 502; const SERVICE_UNAVAILABLE = 503; const GATEWAY_TIMEOUT = 504; const HTTP_VERSION_NOT_SUPPORTED = 505; const VARIANT_ALSO_NEGOTIATES = 506; const INSUFFICIENT_STORAGE = 507; const NOT_EXTENDED = 510; const NETWORK_AUTHENTICATION_REQUIRED = 511; /* * Send an HTTP request to a URI. * * Please note: The only URI that are supported in the HTTP Transport implementation * are the HTTP and HTTPS protocols. * * @since 2.7.0 * * @param string $url The request URL. * @param string\|array $args { * Optional. Array or string of HTTP request arguments. * * @type string $method Request method. Accepts 'GET', 'POST', 'HEAD', 'PUT', 'DELETE', * 'TRACE', 'OPTIONS', or 'PATCH'. * Some transports technically allow others, but should not be * assumed. Default 'GET'. * @type int $timeout How long the connection should stay open in seconds. Default 5. * @type int $redirection Number of allowed redirects. Not supported by all transports * Default 5. * @type string $httpversion Version of the HTTP protocol to use. Accepts '1.0' and '1.1'. * Default '1.0'. * @type string $user-agent User-agent value sent. * Default 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ). * @type bool $reject_unsafe_urls Whether to pass URLs through wp_http_validate_url(). * Default false. * @type bool $blocking Whether the calling code requires the result of the request. * If set to false, the request will be sent to the remote server, * and processing returned to the calling code immediately, the caller * will know if the request succeeded or failed, but will not receive * any response from the remote server. Default true. * @type string\|array $headers Array or string of headers to send with the request. * Default empty array. * @type array $cookies List of cookies to send with the request. Default empty array. * @type string\|array $body Body to send with the request. Default null. * @type bool $compress Whether to compress the $body when sending the request. * Default false. * @type bool $decompress Whether to decompress a compressed response. If set to false and * compressed content is returned in the response anyway, it will * need to be separately decompressed. Default true. * @type bool $sslverify Whether to verify SSL for the request. Default true. * @type string sslcertificates Absolute path to an SSL certificate .crt file. * Default ABSPATH . WPINC . '/certificates/ca-bundle.crt'. * @type bool $stream Whether to stream to a file. If set to true and no filename was * given, it will be droped it in the WP temp dir and its name will * be set using the basename of the URL. Default false. * @type string $filename Filename of the file to write to when streaming. $stream must be * set to true. Default null. * @type int $limit_response_size Size in bytes to limit the response to. Default null. * * } * @return array\|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. * A WP_Error instance upon error. / public function request( $url, $args = array() ) { $defaults = array( 'method' => 'GET', /* * Filters the timeout value for an HTTP request. * * @since 2.7.0 * @since 5.1.0 The `$url` parameter was added. * * @param int $timeout_value Time in seconds until a request times out. Default 5. * @param string $url The request URL. / 'timeout' => apply_filters( 'http_request_timeout', 5, $url ), /* * Filters the number of redirects allowed during an HTTP request. * * @since 2.7.0 * @since 5.1.0 The `$url` parameter was added. * * @param int $redirect_count Number of redirects allowed. Default 5. * @param string $url The request URL. / 'redirection' => apply_filters( 'http_request_redirection_count', 5, $url ), /* * Filters the version of the HTTP protocol used in a request. * * @since 2.7.0 * @since 5.1.0 The `$url` parameter was added. * * @param string $version Version of HTTP used. Accepts '1.0' and '1.1'. Default '1.0'. * @param string $url The request URL. / 'httpversion' => apply_filters( 'http_request_version', '1.0', $url ), /* * Filters the user agent value sent with an HTTP request. * * @since 2.7.0 * @since 5.1.0 The `$url` parameter was added. * * @param string $user_agent WordPress user agent string. * @param string $url The request URL. / 'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ), $url ), /* * Filters whether to pass URLs through wp_http_validate_url() in an HTTP request. * * @since 3.6.0 * @since 5.1.0 The `$url` parameter was added. * * @param bool $pass_url Whether to pass URLs through wp_http_validate_url(). Default false. * @param string $url The request URL. / 'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false, $url ), 'blocking' => true, 'headers' => array(), 'cookies' => array(), 'body' => null, 'compress' => false, 'decompress' => true, 'sslverify' => false, 'sslcertificates' => ABSPATH . WPINC . '/certificates/ca-bundle.crt', 'stream' => false, 'filename' => null, 'limit_response_size' => null, ); // Pre-parse for the HEAD checks. $args = wp_parse_args( $args ); // By default, Head requests do not cause redirections. if ( isset( $args['method'] ) && 'HEAD' == $args['method'] ) { $defaults['redirection'] = 0; } $r = wp_parse_args( $args, $defaults ); /* * Filters the arguments used in an HTTP request. * * @since 2.7.0 * * @param array $r An array of HTTP request arguments. * @param string $url The request URL. / $r = apply_filters( 'http_request_args', $r, $url ); // The transports decrement this, store a copy of the original value for loop purposes. if ( ! isset( $r['_redirection'] ) ) { $r['_redirection'] = $r['redirection']; } /* * Filters whether to preempt an HTTP request's return value. * * Returning a non-false value from the filter will short-circuit the HTTP request and return * early with that value. A filter should return either: * * - An array containing 'headers', 'body', 'response', 'cookies', and 'filename' elements * - A WP_Error instance * - boolean false (to avoid short-circuiting the response) * * Returning any other value may result in unexpected behaviour. * * @since 2.9.0 * * @param false\|array\|WP_Error $preempt Whether to preempt an HTTP request's return value. Default false. * @param array $r HTTP request arguments. * @param string $url The request URL. / $pre = apply_filters( 'pre_http_request', false, $r, $url ); if ( false !== $pre ) { return $pre; } if ( function_exists( 'wp_kses_bad_protocol' ) ) { if ( $r['reject_unsafe_urls'] ) { $url = wp_http_validate_url( $url ); } if ( $url ) { $url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) ); } } $arrURL = @parse_url( $url ); if ( empty( $url ) \|\| empty( $arrURL['scheme'] ) ) { return new WP_Error( 'http_request_failed', __( 'A valid URL was not provided.' ) ); } if ( $this->block_request( $url ) ) { return new WP_Error( 'http_request_failed', __( 'User has blocked requests through HTTP.' ) ); } // If we are streaming to a file but no filename was given drop it in the WP temp dir // and pick its name using the basename of the $url if ( $r['stream'] ) { if ( empty( $r['filename'] ) ) { $r['filename'] = get_temp_dir() . basename( $url ); } // Force some settings if we are streaming to a file and check for existence and perms of destination directory $r['blocking'] = true; if ( ! wp_is_writable( dirname( $r['filename'] ) ) ) { return new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) ); } } if ( is_null( $r['headers'] ) ) { $r['headers'] = array(); } // WP allows passing in headers as a string, weirdly. if ( ! is_array( $r['headers'] ) ) { $processedHeaders = WP_Http::processHeaders( $r['headers'] ); $r['headers'] = $processedHeaders['headers']; } // Setup arguments $headers = $r['headers']; $data = $r['body']; $type = $r['method']; $options = array( 'timeout' => $r['timeout'], 'useragent' => $r['user-agent'], 'blocking' => $r['blocking'], 'hooks' => new WP_HTTP_Requests_Hooks( $url, $r ), ); // Ensure redirects follow browser behaviour. $options['hooks']->register( 'requests.before_redirect', array( get_class(), 'browser_redirect_compatibility' ) ); // Validate redirected URLs. if ( function_exists( 'wp_kses_bad_protocol' ) && $r['reject_unsafe_urls'] ) { $options['hooks']->register( 'requests.before_redirect', array( get_class(), 'validate_redirects' ) ); } if ( $r['stream'] ) { $options['filename'] = $r['filename']; } if ( empty( $r['redirection'] ) ) { $options['follow_redirects'] = false; } else { $options['redirects'] = $r['redirection']; } // Use byte limit, if we can if ( isset( $r['limit_response_size'] ) ) { $options['max_bytes'] = $r['limit_response_size']; } // If we've got cookies, use and convert them to Requests_Cookie. if ( ! empty( $r['cookies'] ) ) { $options['cookies'] = WP_Http::normalize_cookies( $r['cookies'] ); } // SSL certificate handling if ( ! $r['sslverify'] ) { $options['verify'] = false; $options['verifyname'] = false; } else { $options['verify'] = $r['sslcertificates']; } // All non-GET/HEAD requests should put the arguments in the form body. if ( 'HEAD' !== $type && 'GET' !== $type ) { $options['data_format'] = 'body'; } /* * Filters whether SSL should be verified for non-local requests. * * @since 2.8.0 * @since 5.1.0 The `$url` parameter was added. * * @param bool $ssl_verify Whether to verify the SSL connection. Default true. * @param string $url The request URL. / $options['verify'] = apply_filters( 'https_ssl_verify', $options['verify'], $url ); // Check for proxies. $proxy = new WP_HTTP_Proxy(); if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) { $options['proxy'] = new Requests_Proxy_HTTP( $proxy->host() . ':' . $proxy->port() ); if ( $proxy->use_authentication() ) { $options['proxy']->use_authentication = true; $options['proxy']->user = $proxy->username(); $options['proxy']->pass = $proxy->password(); } } // Avoid issues where mbstring.func_overload is enabled mbstring_binary_safe_encoding(); try { $requests_response = Requests::request( $url, $headers, $data, $type, $options ); // Convert the response into an array $http_response = new WP_HTTP_Requests_Response( $requests_response, $r['filename'] ); $response = $http_response->to_array(); // Add the original object to the array. $response['http_response'] = $http_response; } catch ( Requests_Exception $e ) { $response = new WP_Error( 'http_request_failed', $e->getMessage() ); } reset_mbstring_encoding(); /* * Fires after an HTTP API response is received and before the response is returned. * * @since 2.8.0 * * @param array\|WP_Error $response HTTP response or WP_Error object. * @param string $context Context under which the hook is fired. * @param string $class HTTP transport used. * @param array $r HTTP request arguments. * @param string $url The request URL. / do_action( 'http_api_debug', $response, 'response', 'Requests', $r, $url ); if ( is_wp_error( $response ) ) { return $response; } if ( ! $r['blocking'] ) { return array( 'headers' => array(), 'body' => '', 'response' => array( 'code' => false, 'message' => false, ), 'cookies' => array(), 'http_response' => null, ); } /* * Filters the HTTP API response immediately before the response is returned. * * @since 2.9.0 * * @param array $response HTTP response. * @param array $r HTTP request arguments. * @param string $url The request URL. / return apply_filters( 'http_response', $response, $r, $url ); } /* * Normalizes cookies for using in Requests. * * @since 4.6.0 * * @param array $cookies Array of cookies to send with the request. * @return Requests_Cookie_Jar Cookie holder object. / public static function normalize_cookies( $cookies ) { $cookie_jar = new Requests_Cookie_Jar(); foreach ( $cookies as $name => $value ) { if ( $value instanceof WP_Http_Cookie ) { $cookie_jar[ $value->name ] = new Requests_Cookie( $value->name, $value->value, $value->get_attributes() ); } elseif ( is_scalar( $value ) ) { $cookie_jar[ $name ] = new Requests_Cookie( $name, $value ); } } return $cookie_jar; } /* * Match redirect behaviour to browser handling. * * Changes 302 redirects from POST to GET to match browser handling. Per * RFC 7231, user agents can deviate from the strict reading of the * specification for compatibility purposes. * * @since 4.6.0 * * @param string $location URL to redirect to. * @param array $headers Headers for the redirect. * @param string\|array $data Body to send with the request. * @param array $options Redirect request options. * @param Requests_Response $original Response object. / public static function browser_redirect_compatibility( $location, $headers, $data, &$options, $original ) { // Browser compat if ( $original->status_code === 302 ) { $options['type'] = Requests::GET; } } /* * Validate redirected URLs. * * @since 4.7.5 * * @throws Requests_Exception On unsuccessful URL validation * @param string $location URL to redirect to. / public static function validate_redirects( $location ) { if ( ! wp_http_validate_url( $location ) ) { throw new Requests_Exception( __( 'A valid URL was not provided.' ), 'wp_http.redirect_failed_validation' ); } } /* * Tests which transports are capable of supporting the request. * * @since 3.2.0 * * @param array $args Request arguments * @param string $url URL to Request * * @return string\|false Class name for the first transport that claims to support the request. False if no transport claims to support the request. / public function _get_first_available_transport( $args, $url = null ) { $transports = array( 'curl', 'streams' ); /* * Filters which HTTP transports are available and in what order. * * @since 3.7.0 * * @param array $transports Array of HTTP transports to check. Default array contains * 'curl', and 'streams', in that order. * @param array $args HTTP request arguments. * @param string $url The URL to request. / $request_order = apply_filters( 'http_api_transports', $transports, $args, $url ); // Loop over each transport on each HTTP request looking for one which will serve this request's needs. foreach ( $request_order as $transport ) { if ( in_array( $transport, $transports ) ) { $transport = ucfirst( $transport ); } $class = 'WP_Http_' . $transport; // Check to see if this transport is a possibility, calls the transport statically. if ( ! call_user_func( array( $class, 'test' ), $args, $url ) ) { continue; } return $class; } return false; } /* * Dispatches a HTTP request to a supporting transport. * * Tests each transport in order to find a transport which matches the request arguments. * Also caches the transport instance to be used later. * * The order for requests is cURL, and then PHP Streams. * * @since 3.2.0 * @deprecated 5.1.0 Use WP_Http::request() * @see WP_Http::request() * * @param string $url URL to Request * @param array $args Request arguments * @return array\|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error / private function _dispatch_request( $url, $args ) { static $transports = array(); $class = $this->_get_first_available_transport( $args, $url ); if ( ! $class ) { return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) ); } // Transport claims to support request, instantiate it and give it a whirl. if ( empty( $transports[ $class ] ) ) { $transports[ $class ] = new $class; } $response = $transports[ $class ]->request( $url, $args ); /* This action is documented in site-inc/class-http.php / do_action( 'http_api_debug', $response, 'response', $class, $args, $url ); if ( is_wp_error( $response ) ) { return $response; } /* This filter is documented in site-inc/class-http.php / return apply_filters( 'http_response', $response, $args, $url ); } /* * Uses the POST HTTP method. * * Used for sending data that is expected to be in the body. * * @since 2.7.0 * * @param string $url The request URL. * @param string\|array $args Optional. Override the defaults. * @return array\|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error / public function post( $url, $args = array() ) { $defaults = array( 'method' => 'POST' ); $r = wp_parse_args( $args, $defaults ); return $this->request( $url, $r ); } /* * Uses the GET HTTP method. * * Used for sending data that is expected to be in the body. * * @since 2.7.0 * * @param string $url The request URL. * @param string\|array $args Optional. Override the defaults. * @return array\|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error / public function get( $url, $args = array() ) { $defaults = array( 'method' => 'GET' ); $r = wp_parse_args( $args, $defaults ); return $this->request( $url, $r ); } /* * Uses the HEAD HTTP method. * * Used for sending data that is expected to be in the body. * * @since 2.7.0 * * @param string $url The request URL. * @param string\|array $args Optional. Override the defaults. * @return array\|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error / public function head( $url, $args = array() ) { $defaults = array( 'method' => 'HEAD' ); $r = wp_parse_args( $args, $defaults ); return $this->request( $url, $r ); } /* * Parses the responses and splits the parts into headers and body. * * @since 2.7.0 * * @param string $strResponse The full response string * @return array Array with 'headers' and 'body' keys. / public static function processResponse( $strResponse ) { $res = explode( "\r\n\r\n", $strResponse, 2 ); return array( 'headers' => $res[0], 'body' => isset( $res[1] ) ? $res[1] : '', ); } /* * Transform header string into an array. * * If an array is given then it is assumed to be raw header data with numeric keys with the * headers as the values. No headers must be passed that were already processed. * * @since 2.7.0 * * @param string\|array $headers * @param string $url The URL that was requested * @return array Processed string headers. If duplicate headers are encountered, * Then a numbered array is returned as the value of that header-key. / public static function processHeaders( $headers, $url = '' ) { // Split headers, one per array element. if ( is_string( $headers ) ) { // Tolerate line terminator: CRLF = LF (RFC 2616 19.3). $headers = str_replace( "\r\n", "\n", $headers ); / * Unfold folded header fields. LWS = [CRLF] 1( SP \| HT ) <US-ASCII SP, space (32)>, <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2). / $headers = preg_replace( '/\n[ \t]/', ' ', $headers ); // Create the headers array. $headers = explode( "\n", $headers ); } $response = array( 'code' => 0, 'message' => '', ); / * If a redirection has taken place, The headers for each page request may have been passed. * In this case, determine the final HTTP header and parse from there. / for ( $i = count( $headers ) - 1; $i >= 0; $i-- ) { if ( ! empty( $headers[ $i ] ) && false === strpos( $headers[ $i ], ':' ) ) { $headers = array_splice( $headers, $i ); break; } } $cookies = array(); $newheaders = array(); foreach ( (array) $headers as $tempheader ) { if ( empty( $tempheader ) ) { continue; } if ( false === strpos( $tempheader, ':' ) ) { $stack = explode( ' ', $tempheader, 3 ); $stack[] = ''; list( , $response['code'], $response['message']) = $stack; continue; } list($key, $value) = explode( ':', $tempheader, 2 ); $key = strtolower( $key ); $value = trim( $value ); if ( isset( $newheaders[ $key ] ) ) { if ( ! is_array( $newheaders[ $key ] ) ) { $newheaders[ $key ] = array( $newheaders[ $key ] ); } $newheaders[ $key ][] = $value; } else { $newheaders[ $key ] = $value; } if ( 'set-cookie' == $key ) { $cookies[] = new WP_Http_Cookie( $value, $url ); } } // Cast the Response Code to an int $response['code'] = intval( $response['code'] ); return array( 'response' => $response, 'headers' => $newheaders, 'cookies' => $cookies, ); } /* * Takes the arguments for a ::request() and checks for the cookie array. * * If it's found, then it upgrades any basic name => value pairs to WP_Http_Cookie instances, * which are each parsed into strings and added to the Cookie: header (within the arguments array). * Edits the array by reference. * * @since 2.8.0 * * @param array $r Full array of args passed into ::request() / public static function buildCookieHeader( &$r ) { if ( ! empty( $r['cookies'] ) ) { // Upgrade any name => value cookie pairs to WP_HTTP_Cookie instances. foreach ( $r['cookies'] as $name => $value ) { if ( ! is_object( $value ) ) { $r['cookies'][ $name ] = new WP_Http_Cookie( array( 'name' => $name, 'value' => $value, ) ); } } $cookies_header = ''; foreach ( (array) $r['cookies'] as $cookie ) { $cookies_header .= $cookie->getHeaderValue() . '; '; } $cookies_header = substr( $cookies_header, 0, -2 ); $r['headers']['cookie'] = $cookies_header; } } /* * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification. * * Based off the HTTP http_encoding_dechunk function. * * @link https://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding. * * @since 2.7.0 * * @param string $body Body content * @return string Chunked decoded body on success or raw body on failure. / public static function chunkTransferDecode( $body ) { // The body is not chunked encoded or is malformed. if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]\r\n/i', trim( $body ) ) ) { return $body; } $parsed_body = ''; // We'll be altering $body, so need a backup in case of error. $body_original = $body; while ( true ) { $has_chunk = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]\r\n/i', $body, $match ); if ( ! $has_chunk \|\| empty( $match[1] ) ) { return $body_original; } $length = hexdec( $match[1] ); $chunk_length = strlen( $match[0] ); // Parse out the chunk of data. $parsed_body .= substr( $body, $chunk_length, $length ); // Remove the chunk from the raw data. $body = substr( $body, $length + $chunk_length ); // End of the document. if ( '0' === trim( $body ) ) { return $parsed_body; } } } /* * Block requests through the proxy. * * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will * prevent plugins from working and core functionality, if you don't include api.sitepad.org. * * You block external URL requests by defining WP_HTTP_BLOCK_EXTERNAL as true in your wp-config.php * file and this will only allow localhost and your site to make requests. The constant * WP_ACCESSIBLE_HOSTS will allow additional hosts to go through for requests. The format of the * WP_ACCESSIBLE_HOSTS constant is a comma separated list of hostnames to allow, wildcard domains * are supported, eg .wordpress.org will allow for all subdomains of wordpress.org to be contacted. * @since 2.8.0 * @link https://core.trac.wordpress.org/ticket/8927 Allow preventing external requests. * @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS * * @staticvar array\|null $accessible_hosts * @staticvar array $wildcard_regex * * @param string $uri URI of url. * @return bool True to block, false to allow. / public function block_request( $uri ) { // We don't need to block requests, because nothing is blocked. if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) \|\| ! WP_HTTP_BLOCK_EXTERNAL ) { return false; } $check = parse_url( $uri ); if ( ! $check ) { return true; } $home = parse_url( get_option( 'siteurl' ) ); // Don't block requests back to ourselves by default. if ( 'localhost' == $check['host'] \|\| ( isset( $home['host'] ) && $home['host'] == $check['host'] ) ) { /* * Filters whether to block local requests through the proxy. * * @since 2.8.0 * * @param bool $block Whether to block local requests through proxy. * Default false. / return apply_filters( 'block_local_requests', false ); } if ( ! defined( 'WP_ACCESSIBLE_HOSTS' ) ) { return true; } static $accessible_hosts = null; static $wildcard_regex = array(); if ( null === $accessible_hosts ) { $accessible_hosts = preg_split( '\|,\s\|', WP_ACCESSIBLE_HOSTS ); if ( false !== strpos( WP_ACCESSIBLE_HOSTS, '' ) ) { $wildcard_regex = array(); foreach ( $accessible_hosts as $host ) { $wildcard_regex[] = str_replace( '\', '.+', preg_quote( $host, '/' ) ); } $wildcard_regex = '/^(' . implode( '\|', $wildcard_regex ) . ')$/i'; } } if ( ! empty( $wildcard_regex ) ) { return ! preg_match( $wildcard_regex, $check['host'] ); } else { return ! in_array( $check['host'], $accessible_hosts ); //Inverse logic, If it's in the array, then we can't access it. } } /** * Used as a wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7. * * @deprecated 4.4.0 Use wp_parse_url() * @see wp_parse_url() * * @param string $url The URL to parse. * @return bool\|array False on failure; Array of URL components on success; * See parse_url()'s return values. / protected static function parse_url( $url ) { _deprecated_function( __METHOD__, '4.4.0', 'wp_parse_url()' ); return wp_parse_url( $url ); } /* * Converts a relative URL to an absolute URL relative to a given URL. * * If an Absolute URL is provided, no processing of that URL is done. * * @since 3.4.0 * * @param string $maybe_relative_path The URL which might be relative * @param string $url The URL which $maybe_relative_path is relative to * @return string An Absolute URL, in a failure condition where the URL cannot be parsed, the relative URL will be returned. / public static function make_absolute_url( $maybe_relative_path, $url ) { if ( empty( $url ) ) { return $maybe_relative_path; } if ( ! $url_parts = wp_parse_url( $url ) ) { return $maybe_relative_path; } if ( ! $relative_url_parts = wp_parse_url( $maybe_relative_path ) ) { return $maybe_relative_path; } // Check for a scheme on the 'relative' url if ( ! empty( $relative_url_parts['scheme'] ) ) { return $maybe_relative_path; } $absolute_path = $url_parts['scheme'] . '://'; // Schemeless URL's will make it this far, so we check for a host in the relative url and convert it to a protocol-url if ( isset( $relative_url_parts['host'] ) ) { $absolute_path .= $relative_url_parts['host']; if ( isset( $relative_url_parts['port'] ) ) { $absolute_path .= ':' . $relative_url_parts['port']; } } else { $absolute_path .= $url_parts['host']; if ( isset( $url_parts['port'] ) ) { $absolute_path .= ':' . $url_parts['port']; } } // Start off with the Absolute URL path. $path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/'; // If it's a root-relative path, then great. if ( ! empty( $relative_url_parts['path'] ) && '/' == $relative_url_parts['path'][0] ) { $path = $relative_url_parts['path']; // Else it's a relative path. } elseif ( ! empty( $relative_url_parts['path'] ) ) { // Strip off any file components from the absolute path. $path = substr( $path, 0, strrpos( $path, '/' ) + 1 ); // Build the new path. $path .= $relative_url_parts['path']; // Strip all /path/../ out of the path. while ( strpos( $path, '../' ) > 1 ) { $path = preg_replace( '![^/]+/\.\./!', '', $path ); } // Strip any final leading ../ from the path. $path = preg_replace( '!^/(\.\./)+!', '', $path ); } // Add the Query string. if ( ! empty( $relative_url_parts['query'] ) ) { $path .= '?' . $relative_url_parts['query']; } return $absolute_path . '/' . ltrim( $path, '/' ); } /* * Handles HTTP Redirects and follows them if appropriate. * * @since 3.7.0 * * @param string $url The URL which was requested. * @param array $args The Arguments which were used to make the request. * @param array $response The Response of the HTTP request. * @return false\|object False if no redirect is present, a WP_HTTP or WP_Error result otherwise. / public static function handle_redirects( $url, $args, $response ) { // If no redirects are present, or, redirects were not requested, perform no action. if ( ! isset( $response['headers']['location'] ) \|\| 0 === $args['_redirection'] ) { return false; } // Only perform redirections on redirection http codes. if ( $response['response']['code'] > 399 \|\| $response['response']['code'] < 300 ) { return false; } // Don't redirect if we've run out of redirects. if ( $args['redirection']-- <= 0 ) { return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) ); } $redirect_location = $response['headers']['location']; // If there were multiple Location headers, use the last header specified. if ( is_array( $redirect_location ) ) { $redirect_location = array_pop( $redirect_location ); } $redirect_location = WP_Http::make_absolute_url( $redirect_location, $url ); // POST requests should not POST to a redirected location. if ( 'POST' == $args['method'] ) { if ( in_array( $response['response']['code'], array( 302, 303 ) ) ) { $args['method'] = 'GET'; } } // Include valid cookies in the redirect process. if ( ! empty( $response['cookies'] ) ) { foreach ( $response['cookies'] as $cookie ) { if ( $cookie->test( $redirect_location ) ) { $args['cookies'][] = $cookie; } } } return wp_remote_request( $redirect_location, $args ); } /* * Determines if a specified string represents an IP address or not. * * This function also detects the type of the IP address, returning either * '4' or '6' to represent a IPv4 and IPv6 address respectively. * This does not verify if the IP is a valid IP, only that it appears to be * an IP address. * * @link http://home.deds.nl/~aeron/regex/ for IPv6 regex * * @since 3.7.0 * * @param string $maybe_ip A suspected IP address * @return integer\|bool Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure / public static function is_ip_address( $maybe_ip ) { if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) ) { return 4; } if ( false !== strpos( $maybe_ip, ':' ) && preg_match( '/^(((?=.(::))(?!.*\3.+\3))\3?\|([\dA-F]{1,4}(\3\|:\b\|$)\|\2))(?4){5}((?4){2}\|(((2[0-4]\|1\d\|[1-9])?\d\|25[0-5])\.?\b){4})$/i', trim( $maybe_ip, ' []' ) ) ) { return 6; } return false; } } Back

Edit File : class-http.php | Size : 36.22 KB

<?php
/**
 * HTTP API: WP_Http class
 *
 * @package WordPress
 * @subpackage HTTP
 * @since 2.7.0
 */

if ( ! class_exists( 'Requests' ) ) {
	require( ABSPATH . WPINC . '/class-requests.php' );

Requests::register_autoloader();
	Requests::set_certificate_path( ABSPATH . WPINC . '/certificates/ca-bundle.crt' );
}

/**
 * Core class used for managing HTTP transports and making HTTP requests.
 *
 * This class is used to consistently make outgoing HTTP requests easy for developers
 * while still being compatible with the many PHP configurations under which
 * WordPress runs.
 *
 * Debugging includes several actions, which pass different variables for debugging the HTTP API.
 *
 * @since 2.7.0
 */
class WP_Http {

// Aliases for HTTP response codes.
	const HTTP_CONTINUE       = 100;
	const SWITCHING_PROTOCOLS = 101;
	const PROCESSING          = 102;
	const EARLY_HINTS         = 103;

const OK                            = 200;
	const CREATED                       = 201;
	const ACCEPTED                      = 202;
	const NON_AUTHORITATIVE_INFORMATION = 203;
	const NO_CONTENT                    = 204;
	const RESET_CONTENT                 = 205;
	const PARTIAL_CONTENT               = 206;
	const MULTI_STATUS                  = 207;
	const IM_USED                       = 226;

const MULTIPLE_CHOICES   = 300;
	const MOVED_PERMANENTLY  = 301;
	const FOUND              = 302;
	const SEE_OTHER          = 303;
	const NOT_MODIFIED       = 304;
	const USE_PROXY          = 305;
	const RESERVED           = 306;
	const TEMPORARY_REDIRECT = 307;
	const PERMANENT_REDIRECT = 308;

const BAD_REQUEST                     = 400;
	const UNAUTHORIZED                    = 401;
	const PAYMENT_REQUIRED                = 402;
	const FORBIDDEN                       = 403;
	const NOT_FOUND                       = 404;
	const METHOD_NOT_ALLOWED              = 405;
	const NOT_ACCEPTABLE                  = 406;
	const PROXY_AUTHENTICATION_REQUIRED   = 407;
	const REQUEST_TIMEOUT                 = 408;
	const CONFLICT                        = 409;
	const GONE                            = 410;
	const LENGTH_REQUIRED                 = 411;
	const PRECONDITION_FAILED             = 412;
	const REQUEST_ENTITY_TOO_LARGE        = 413;
	const REQUEST_URI_TOO_LONG            = 414;
	const UNSUPPORTED_MEDIA_TYPE          = 415;
	const REQUESTED_RANGE_NOT_SATISFIABLE = 416;
	const EXPECTATION_FAILED              = 417;
	const IM_A_TEAPOT                     = 418;
	const MISDIRECTED_REQUEST             = 421;
	const UNPROCESSABLE_ENTITY            = 422;
	const LOCKED                          = 423;
	const FAILED_DEPENDENCY               = 424;
	const UPGRADE_REQUIRED                = 426;
	const PRECONDITION_REQUIRED           = 428;
	const TOO_MANY_REQUESTS               = 429;
	const REQUEST_HEADER_FIELDS_TOO_LARGE = 431;
	const UNAVAILABLE_FOR_LEGAL_REASONS   = 451;

const INTERNAL_SERVER_ERROR           = 500;
	const NOT_IMPLEMENTED                 = 501;
	const BAD_GATEWAY                     = 502;
	const SERVICE_UNAVAILABLE             = 503;
	const GATEWAY_TIMEOUT                 = 504;
	const HTTP_VERSION_NOT_SUPPORTED      = 505;
	const VARIANT_ALSO_NEGOTIATES         = 506;
	const INSUFFICIENT_STORAGE            = 507;
	const NOT_EXTENDED                    = 510;
	const NETWORK_AUTHENTICATION_REQUIRED = 511;

/**
	 * Send an HTTP request to a URI.
	 *
	 * Please note: The only URI that are supported in the HTTP Transport implementation
	 * are the HTTP and HTTPS protocols.
	 *
	 * @since 2.7.0
	 *
	 * @param string       $url  The request URL.
	 * @param string|array $args {
	 *     Optional. Array or string of HTTP request arguments.
	 *
	 *     @type string       $method              Request method. Accepts 'GET', 'POST', 'HEAD', 'PUT', 'DELETE',
	 *                                             'TRACE', 'OPTIONS', or 'PATCH'.
	 *                                             Some transports technically allow others, but should not be
	 *                                             assumed. Default 'GET'.
	 *     @type int          $timeout             How long the connection should stay open in seconds. Default 5.
	 *     @type int          $redirection         Number of allowed redirects. Not supported by all transports
	 *                                             Default 5.
	 *     @type string       $httpversion         Version of the HTTP protocol to use. Accepts '1.0' and '1.1'.
	 *                                             Default '1.0'.
	 *     @type string       $user-agent          User-agent value sent.
	 *                                             Default 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ).
	 *     @type bool         $reject_unsafe_urls  Whether to pass URLs through wp_http_validate_url().
	 *                                             Default false.
	 *     @type bool         $blocking            Whether the calling code requires the result of the request.
	 *                                             If set to false, the request will be sent to the remote server,
	 *                                             and processing returned to the calling code immediately, the caller
	 *                                             will know if the request succeeded or failed, but will not receive
	 *                                             any response from the remote server. Default true.
	 *     @type string|array $headers             Array or string of headers to send with the request.
	 *                                             Default empty array.
	 *     @type array        $cookies             List of cookies to send with the request. Default empty array.
	 *     @type string|array $body                Body to send with the request. Default null.
	 *     @type bool         $compress            Whether to compress the $body when sending the request.
	 *                                             Default false.
	 *     @type bool         $decompress          Whether to decompress a compressed response. If set to false and
	 *                                             compressed content is returned in the response anyway, it will
	 *                                             need to be separately decompressed. Default true.
	 *     @type bool         $sslverify           Whether to verify SSL for the request. Default true.
	 *     @type string       sslcertificates      Absolute path to an SSL certificate .crt file.
	 *                                             Default ABSPATH . WPINC . '/certificates/ca-bundle.crt'.
	 *     @type bool         $stream              Whether to stream to a file. If set to true and no filename was
	 *                                             given, it will be droped it in the WP temp dir and its name will
	 *                                             be set using the basename of the URL. Default false.
	 *     @type string       $filename            Filename of the file to write to when streaming. $stream must be
	 *                                             set to true. Default null.
	 *     @type int          $limit_response_size Size in bytes to limit the response to. Default null.
	 *
	 * }
	 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.
	 *                        A WP_Error instance upon error.
	 */
	public function request( $url, $args = array() ) {
		$defaults = array(
			'method'              => 'GET',
			/**
			 * Filters the timeout value for an HTTP request.
			 *
			 * @since 2.7.0
			 * @since 5.1.0 The `$url` parameter was added.
			 *
			 * @param int    $timeout_value Time in seconds until a request times out. Default 5.
			 * @param string $url           The request URL.
			 */
			'timeout'             => apply_filters( 'http_request_timeout', 5, $url ),
			/**
			 * Filters the number of redirects allowed during an HTTP request.
			 *
			 * @since 2.7.0
			 * @since 5.1.0 The `$url` parameter was added.
			 *
			 * @param int    $redirect_count Number of redirects allowed. Default 5.
			 * @param string $url            The request URL.
			 */
			'redirection'         => apply_filters( 'http_request_redirection_count', 5, $url ),
			/**
			 * Filters the version of the HTTP protocol used in a request.
			 *
			 * @since 2.7.0
			 * @since 5.1.0 The `$url` parameter was added.
			 *
			 * @param string $version Version of HTTP used. Accepts '1.0' and '1.1'. Default '1.0'.
			 * @param string $url     The request URL.
			 */
			'httpversion'         => apply_filters( 'http_request_version', '1.0', $url ),
			/**
			 * Filters the user agent value sent with an HTTP request.
			 *
			 * @since 2.7.0
			 * @since 5.1.0 The `$url` parameter was added.
			 *
			 * @param string $user_agent WordPress user agent string.
			 * @param string $url        The request URL.
			 */
			'user-agent'          => apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ), $url ),
			/**
			 * Filters whether to pass URLs through wp_http_validate_url() in an HTTP request.
			 *
			 * @since 3.6.0
			 * @since 5.1.0 The `$url` parameter was added.
			 *
			 * @param bool   $pass_url Whether to pass URLs through wp_http_validate_url(). Default false.
			 * @param string $url      The request URL.
			 */
			'reject_unsafe_urls'  => apply_filters( 'http_request_reject_unsafe_urls', false, $url ),
			'blocking'            => true,
			'headers'             => array(),
			'cookies'             => array(),
			'body'                => null,
			'compress'            => false,
			'decompress'          => true,
			'sslverify'           => false,
			'sslcertificates'     => ABSPATH . WPINC . '/certificates/ca-bundle.crt',
			'stream'              => false,
			'filename'            => null,
			'limit_response_size' => null,
		);

// Pre-parse for the HEAD checks.
		$args = wp_parse_args( $args );

// By default, Head requests do not cause redirections.
		if ( isset( $args['method'] ) && 'HEAD' == $args['method'] ) {
			$defaults['redirection'] = 0;
		}

$r = wp_parse_args( $args, $defaults );
		/**
		 * Filters the arguments used in an HTTP request.
		 *
		 * @since 2.7.0
		 *
		 * @param array  $r   An array of HTTP request arguments.
		 * @param string $url The request URL.
		 */
		$r = apply_filters( 'http_request_args', $r, $url );

// The transports decrement this, store a copy of the original value for loop purposes.
		if ( ! isset( $r['_redirection'] ) ) {
			$r['_redirection'] = $r['redirection'];
		}

/**
		 * Filters whether to preempt an HTTP request's return value.
		 *
		 * Returning a non-false value from the filter will short-circuit the HTTP request and return
		 * early with that value. A filter should return either:
		 *
		 *  - An array containing 'headers', 'body', 'response', 'cookies', and 'filename' elements
		 *  - A WP_Error instance
		 *  - boolean false (to avoid short-circuiting the response)
		 *
		 * Returning any other value may result in unexpected behaviour.
		 *
		 * @since 2.9.0
		 *
		 * @param false|array|WP_Error $preempt Whether to preempt an HTTP request's return value. Default false.
		 * @param array               $r        HTTP request arguments.
		 * @param string              $url      The request URL.
		 */
		$pre = apply_filters( 'pre_http_request', false, $r, $url );

if ( false !== $pre ) {
			return $pre;
		}

if ( function_exists( 'wp_kses_bad_protocol' ) ) {
			if ( $r['reject_unsafe_urls'] ) {
				$url = wp_http_validate_url( $url );
			}
			if ( $url ) {
				$url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );
			}
		}

$arrURL = @parse_url( $url );

if ( empty( $url ) || empty( $arrURL['scheme'] ) ) {
			return new WP_Error( 'http_request_failed', __( 'A valid URL was not provided.' ) );
		}

if ( $this->block_request( $url ) ) {
			return new WP_Error( 'http_request_failed', __( 'User has blocked requests through HTTP.' ) );
		}

// If we are streaming to a file but no filename was given drop it in the WP temp dir
		// and pick its name using the basename of the $url
		if ( $r['stream'] ) {
			if ( empty( $r['filename'] ) ) {
				$r['filename'] = get_temp_dir() . basename( $url );
			}

// Force some settings if we are streaming to a file and check for existence and perms of destination directory
			$r['blocking'] = true;
			if ( ! wp_is_writable( dirname( $r['filename'] ) ) ) {
				return new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) );
			}
		}

if ( is_null( $r['headers'] ) ) {
			$r['headers'] = array();
		}

// WP allows passing in headers as a string, weirdly.
		if ( ! is_array( $r['headers'] ) ) {
			$processedHeaders = WP_Http::processHeaders( $r['headers'] );
			$r['headers']     = $processedHeaders['headers'];
		}

// Setup arguments
		$headers = $r['headers'];
		$data    = $r['body'];
		$type    = $r['method'];
		$options = array(
			'timeout'   => $r['timeout'],
			'useragent' => $r['user-agent'],
			'blocking'  => $r['blocking'],
			'hooks'     => new WP_HTTP_Requests_Hooks( $url, $r ),
		);

// Ensure redirects follow browser behaviour.
		$options['hooks']->register( 'requests.before_redirect', array( get_class(), 'browser_redirect_compatibility' ) );

// Validate redirected URLs.
		if ( function_exists( 'wp_kses_bad_protocol' ) && $r['reject_unsafe_urls'] ) {
			$options['hooks']->register( 'requests.before_redirect', array( get_class(), 'validate_redirects' ) );
		}

if ( $r['stream'] ) {
			$options['filename'] = $r['filename'];
		}
		if ( empty( $r['redirection'] ) ) {
			$options['follow_redirects'] = false;
		} else {
			$options['redirects'] = $r['redirection'];
		}

// Use byte limit, if we can
		if ( isset( $r['limit_response_size'] ) ) {
			$options['max_bytes'] = $r['limit_response_size'];
		}

// If we've got cookies, use and convert them to Requests_Cookie.
		if ( ! empty( $r['cookies'] ) ) {
			$options['cookies'] = WP_Http::normalize_cookies( $r['cookies'] );
		}

// SSL certificate handling
		if ( ! $r['sslverify'] ) {
			$options['verify']     = false;
			$options['verifyname'] = false;
		} else {
			$options['verify'] = $r['sslcertificates'];
		}

// All non-GET/HEAD requests should put the arguments in the form body.
		if ( 'HEAD' !== $type && 'GET' !== $type ) {
			$options['data_format'] = 'body';
		}

/**
		 * Filters whether SSL should be verified for non-local requests.
		 *
		 * @since 2.8.0
		 * @since 5.1.0 The `$url` parameter was added.
		 *
		 * @param bool   $ssl_verify Whether to verify the SSL connection. Default true.
		 * @param string $url        The request URL.
		 */
		$options['verify'] = apply_filters( 'https_ssl_verify', $options['verify'], $url );

// Check for proxies.
		$proxy = new WP_HTTP_Proxy();
		if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {
			$options['proxy'] = new Requests_Proxy_HTTP( $proxy->host() . ':' . $proxy->port() );

if ( $proxy->use_authentication() ) {
				$options['proxy']->use_authentication = true;
				$options['proxy']->user               = $proxy->username();
				$options['proxy']->pass               = $proxy->password();
			}
		}

// Avoid issues where mbstring.func_overload is enabled
		mbstring_binary_safe_encoding();

try {
			$requests_response = Requests::request( $url, $headers, $data, $type, $options );

// Convert the response into an array
			$http_response = new WP_HTTP_Requests_Response( $requests_response, $r['filename'] );
			$response      = $http_response->to_array();

// Add the original object to the array.
			$response['http_response'] = $http_response;
		} catch ( Requests_Exception $e ) {
			$response = new WP_Error( 'http_request_failed', $e->getMessage() );
		}

reset_mbstring_encoding();

/**
		 * Fires after an HTTP API response is received and before the response is returned.
		 *
		 * @since 2.8.0
		 *
		 * @param array|WP_Error $response HTTP response or WP_Error object.
		 * @param string         $context  Context under which the hook is fired.
		 * @param string         $class    HTTP transport used.
		 * @param array          $r        HTTP request arguments.
		 * @param string         $url      The request URL.
		 */
		do_action( 'http_api_debug', $response, 'response', 'Requests', $r, $url );
		if ( is_wp_error( $response ) ) {
			return $response;
		}

if ( ! $r['blocking'] ) {
			return array(
				'headers'       => array(),
				'body'          => '',
				'response'      => array(
					'code'    => false,
					'message' => false,
				),
				'cookies'       => array(),
				'http_response' => null,
			);
		}

/**
		 * Filters the HTTP API response immediately before the response is returned.
		 *
		 * @since 2.9.0
		 *
		 * @param array  $response HTTP response.
		 * @param array  $r        HTTP request arguments.
		 * @param string $url      The request URL.
		 */
		return apply_filters( 'http_response', $response, $r, $url );
	}

/**
	 * Normalizes cookies for using in Requests.
	 *
	 * @since 4.6.0
	 *
	 * @param array $cookies Array of cookies to send with the request.
	 * @return Requests_Cookie_Jar Cookie holder object.
	 */
	public static function normalize_cookies( $cookies ) {
		$cookie_jar = new Requests_Cookie_Jar();

foreach ( $cookies as $name => $value ) {
			if ( $value instanceof WP_Http_Cookie ) {
				$cookie_jar[ $value->name ] = new Requests_Cookie( $value->name, $value->value, $value->get_attributes() );
			} elseif ( is_scalar( $value ) ) {
				$cookie_jar[ $name ] = new Requests_Cookie( $name, $value );
			}
		}

return $cookie_jar;
	}

/**
	 * Match redirect behaviour to browser handling.
	 *
	 * Changes 302 redirects from POST to GET to match browser handling. Per
	 * RFC 7231, user agents can deviate from the strict reading of the
	 * specification for compatibility purposes.
	 *
	 * @since 4.6.0
	 *
	 * @param string            $location URL to redirect to.
	 * @param array             $headers  Headers for the redirect.
	 * @param string|array      $data     Body to send with the request.
	 * @param array             $options  Redirect request options.
	 * @param Requests_Response $original Response object.
	 */
	public static function browser_redirect_compatibility( $location, $headers, $data, &$options, $original ) {
		// Browser compat
		if ( $original->status_code === 302 ) {
			$options['type'] = Requests::GET;
		}
	}

/**
	 * Validate redirected URLs.
	 *
	 * @since 4.7.5
	 *
	 * @throws Requests_Exception On unsuccessful URL validation
	 * @param string $location URL to redirect to.
	 */
	public static function validate_redirects( $location ) {
		if ( ! wp_http_validate_url( $location ) ) {
			throw new Requests_Exception( __( 'A valid URL was not provided.' ), 'wp_http.redirect_failed_validation' );
		}
	}

/**
	 * Tests which transports are capable of supporting the request.
	 *
	 * @since 3.2.0
	 *
	 * @param array $args Request arguments
	 * @param string $url URL to Request
	 *
	 * @return string|false Class name for the first transport that claims to support the request. False if no transport claims to support the request.
	 */
	public function _get_first_available_transport( $args, $url = null ) {
		$transports = array( 'curl', 'streams' );

/**
		 * Filters which HTTP transports are available and in what order.
		 *
		 * @since 3.7.0
		 *
		 * @param array  $transports Array of HTTP transports to check. Default array contains
		 *                           'curl', and 'streams', in that order.
		 * @param array  $args       HTTP request arguments.
		 * @param string $url        The URL to request.
		 */
		$request_order = apply_filters( 'http_api_transports', $transports, $args, $url );

// Loop over each transport on each HTTP request looking for one which will serve this request's needs.
		foreach ( $request_order as $transport ) {
			if ( in_array( $transport, $transports ) ) {
				$transport = ucfirst( $transport );
			}
			$class = 'WP_Http_' . $transport;

// Check to see if this transport is a possibility, calls the transport statically.
			if ( ! call_user_func( array( $class, 'test' ), $args, $url ) ) {
				continue;
			}

return $class;
		}

return false;
	}

/**
	 * Dispatches a HTTP request to a supporting transport.
	 *
	 * Tests each transport in order to find a transport which matches the request arguments.
	 * Also caches the transport instance to be used later.
	 *
	 * The order for requests is cURL, and then PHP Streams.
	 *
	 * @since 3.2.0
	 * @deprecated 5.1.0 Use WP_Http::request()
	 * @see WP_Http::request()
	 *
	 * @param string $url URL to Request
	 * @param array $args Request arguments
	 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
	 */
	private function _dispatch_request( $url, $args ) {
		static $transports = array();

$class = $this->_get_first_available_transport( $args, $url );
		if ( ! $class ) {
			return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) );
		}

// Transport claims to support request, instantiate it and give it a whirl.
		if ( empty( $transports[ $class ] ) ) {
			$transports[ $class ] = new $class;
		}

$response = $transports[ $class ]->request( $url, $args );

/** This action is documented in site-inc/class-http.php */
		do_action( 'http_api_debug', $response, 'response', $class, $args, $url );

if ( is_wp_error( $response ) ) {
			return $response;
		}

/** This filter is documented in site-inc/class-http.php */
		return apply_filters( 'http_response', $response, $args, $url );
	}

/**
	 * Uses the POST HTTP method.
	 *
	 * Used for sending data that is expected to be in the body.
	 *
	 * @since 2.7.0
	 *
	 * @param string       $url  The request URL.
	 * @param string|array $args Optional. Override the defaults.
	 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
	 */
	public function post( $url, $args = array() ) {
		$defaults = array( 'method' => 'POST' );
		$r        = wp_parse_args( $args, $defaults );
		return $this->request( $url, $r );
	}

/**
	 * Uses the GET HTTP method.
	 *
	 * Used for sending data that is expected to be in the body.
	 *
	 * @since 2.7.0
	 *
	 * @param string $url The request URL.
	 * @param string|array $args Optional. Override the defaults.
	 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
	 */
	public function get( $url, $args = array() ) {
		$defaults = array( 'method' => 'GET' );
		$r        = wp_parse_args( $args, $defaults );
		return $this->request( $url, $r );
	}

/**
	 * Uses the HEAD HTTP method.
	 *
	 * Used for sending data that is expected to be in the body.
	 *
	 * @since 2.7.0
	 *
	 * @param string $url The request URL.
	 * @param string|array $args Optional. Override the defaults.
	 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error
	 */
	public function head( $url, $args = array() ) {
		$defaults = array( 'method' => 'HEAD' );
		$r        = wp_parse_args( $args, $defaults );
		return $this->request( $url, $r );
	}

/**
	 * Parses the responses and splits the parts into headers and body.
	 *
	 * @since 2.7.0
	 *
	 * @param string $strResponse The full response string
	 * @return array Array with 'headers' and 'body' keys.
	 */
	public static function processResponse( $strResponse ) {
		$res = explode( "\r\n\r\n", $strResponse, 2 );

return array(
			'headers' => $res[0],
			'body'    => isset( $res[1] ) ? $res[1] : '',
		);
	}

/**
	 * Transform header string into an array.
	 *
	 * If an array is given then it is assumed to be raw header data with numeric keys with the
	 * headers as the values. No headers must be passed that were already processed.
	 *
	 * @since 2.7.0
	 *
	 * @param string|array $headers
	 * @param string $url The URL that was requested
	 * @return array Processed string headers. If duplicate headers are encountered,
	 *                  Then a numbered array is returned as the value of that header-key.
	 */
	public static function processHeaders( $headers, $url = '' ) {
		// Split headers, one per array element.
		if ( is_string( $headers ) ) {
			// Tolerate line terminator: CRLF = LF (RFC 2616 19.3).
			$headers = str_replace( "\r\n", "\n", $headers );
			/*
			 * Unfold folded header fields. LWS = [CRLF] 1*( SP | HT ) <US-ASCII SP, space (32)>,
			 * <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2).
			 */
			$headers = preg_replace( '/\n[ \t]/', ' ', $headers );
			// Create the headers array.
			$headers = explode( "\n", $headers );
		}

$response = array(
			'code'    => 0,
			'message' => '',
		);

/*
		 * If a redirection has taken place, The headers for each page request may have been passed.
		 * In this case, determine the final HTTP header and parse from there.
		 */
		for ( $i = count( $headers ) - 1; $i >= 0; $i-- ) {
			if ( ! empty( $headers[ $i ] ) && false === strpos( $headers[ $i ], ':' ) ) {
				$headers = array_splice( $headers, $i );
				break;
			}
		}

$cookies    = array();
		$newheaders = array();
		foreach ( (array) $headers as $tempheader ) {
			if ( empty( $tempheader ) ) {
				continue;
			}

if ( false === strpos( $tempheader, ':' ) ) {
				$stack   = explode( ' ', $tempheader, 3 );
				$stack[] = '';
				list( , $response['code'], $response['message']) = $stack;
				continue;
			}

list($key, $value) = explode( ':', $tempheader, 2 );

$key   = strtolower( $key );
			$value = trim( $value );

if ( isset( $newheaders[ $key ] ) ) {
				if ( ! is_array( $newheaders[ $key ] ) ) {
					$newheaders[ $key ] = array( $newheaders[ $key ] );
				}
				$newheaders[ $key ][] = $value;
			} else {
				$newheaders[ $key ] = $value;
			}
			if ( 'set-cookie' == $key ) {
				$cookies[] = new WP_Http_Cookie( $value, $url );
			}
		}

// Cast the Response Code to an int
		$response['code'] = intval( $response['code'] );

return array(
			'response' => $response,
			'headers'  => $newheaders,
			'cookies'  => $cookies,
		);
	}

/**
	 * Takes the arguments for a ::request() and checks for the cookie array.
	 *
	 * If it's found, then it upgrades any basic name => value pairs to WP_Http_Cookie instances,
	 * which are each parsed into strings and added to the Cookie: header (within the arguments array).
	 * Edits the array by reference.
	 *
	 * @since 2.8.0
	 *
	 * @param array $r Full array of args passed into ::request()
	 */
	public static function buildCookieHeader( &$r ) {
		if ( ! empty( $r['cookies'] ) ) {
			// Upgrade any name => value cookie pairs to WP_HTTP_Cookie instances.
			foreach ( $r['cookies'] as $name => $value ) {
				if ( ! is_object( $value ) ) {
					$r['cookies'][ $name ] = new WP_Http_Cookie(
						array(
							'name'  => $name,
							'value' => $value,
						)
					);
				}
			}

$cookies_header = '';
			foreach ( (array) $r['cookies'] as $cookie ) {
				$cookies_header .= $cookie->getHeaderValue() . '; ';
			}

$cookies_header         = substr( $cookies_header, 0, -2 );
			$r['headers']['cookie'] = $cookies_header;
		}
	}

/**
	 * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification.
	 *
	 * Based off the HTTP http_encoding_dechunk function.
	 *
	 * @link https://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding.
	 *
	 * @since 2.7.0
	 *
	 * @param string $body Body content
	 * @return string Chunked decoded body on success or raw body on failure.
	 */
	public static function chunkTransferDecode( $body ) {
		// The body is not chunked encoded or is malformed.
		if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', trim( $body ) ) ) {
			return $body;
		}

$parsed_body = '';

// We'll be altering $body, so need a backup in case of error.
		$body_original = $body;

while ( true ) {
			$has_chunk = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $body, $match );
			if ( ! $has_chunk || empty( $match[1] ) ) {
				return $body_original;
			}

$length       = hexdec( $match[1] );
			$chunk_length = strlen( $match[0] );

// Parse out the chunk of data.
			$parsed_body .= substr( $body, $chunk_length, $length );

// Remove the chunk from the raw data.
			$body = substr( $body, $length + $chunk_length );

// End of the document.
			if ( '0' === trim( $body ) ) {
				return $parsed_body;
			}
		}
	}

/**
	 * Block requests through the proxy.
	 *
	 * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will
	 * prevent plugins from working and core functionality, if you don't include api.sitepad.org.
	 *
	 * You block external URL requests by defining WP_HTTP_BLOCK_EXTERNAL as true in your wp-config.php
	 * file and this will only allow localhost and your site to make requests. The constant
	 * WP_ACCESSIBLE_HOSTS will allow additional hosts to go through for requests. The format of the
	 * WP_ACCESSIBLE_HOSTS constant is a comma separated list of hostnames to allow, wildcard domains
	 * are supported, eg *.wordpress.org will allow for all subdomains of wordpress.org to be contacted.
	 *
	 * @since 2.8.0
	 * @link https://core.trac.wordpress.org/ticket/8927 Allow preventing external requests.
	 * @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS
	 *
	 * @staticvar array|null $accessible_hosts
	 * @staticvar array      $wildcard_regex
	 *
	 * @param string $uri URI of url.
	 * @return bool True to block, false to allow.
	 */
	public function block_request( $uri ) {
		// We don't need to block requests, because nothing is blocked.
		if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) || ! WP_HTTP_BLOCK_EXTERNAL ) {
			return false;
		}

$check = parse_url( $uri );
		if ( ! $check ) {
			return true;
		}

$home = parse_url( get_option( 'siteurl' ) );

// Don't block requests back to ourselves by default.
		if ( 'localhost' == $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) ) {
			/**
			 * Filters whether to block local requests through the proxy.
			 *
			 * @since 2.8.0
			 *
			 * @param bool $block Whether to block local requests through proxy.
			 *                    Default false.
			 */
			return apply_filters( 'block_local_requests', false );
		}

if ( ! defined( 'WP_ACCESSIBLE_HOSTS' ) ) {
			return true;
		}

static $accessible_hosts = null;
		static $wildcard_regex   = array();
		if ( null === $accessible_hosts ) {
			$accessible_hosts = preg_split( '|,\s*|', WP_ACCESSIBLE_HOSTS );

if ( false !== strpos( WP_ACCESSIBLE_HOSTS, '*' ) ) {
				$wildcard_regex = array();
				foreach ( $accessible_hosts as $host ) {
					$wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );
				}
				$wildcard_regex = '/^(' . implode( '|', $wildcard_regex ) . ')$/i';
			}
		}

if ( ! empty( $wildcard_regex ) ) {
			return ! preg_match( $wildcard_regex, $check['host'] );
		} else {
			return ! in_array( $check['host'], $accessible_hosts ); //Inverse logic, If it's in the array, then we can't access it.
		}

}

/**
	 * Used as a wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7.
	 *
	 * @deprecated 4.4.0 Use wp_parse_url()
	 * @see wp_parse_url()
	 *
	 * @param string $url The URL to parse.
	 * @return bool|array False on failure; Array of URL components on success;
	 *                    See parse_url()'s return values.
	 */
	protected static function parse_url( $url ) {
		_deprecated_function( __METHOD__, '4.4.0', 'wp_parse_url()' );
		return wp_parse_url( $url );
	}

/**
	 * Converts a relative URL to an absolute URL relative to a given URL.
	 *
	 * If an Absolute URL is provided, no processing of that URL is done.
	 *
	 * @since 3.4.0
	 *
	 * @param string $maybe_relative_path The URL which might be relative
	 * @param string $url                 The URL which $maybe_relative_path is relative to
	 * @return string An Absolute URL, in a failure condition where the URL cannot be parsed, the relative URL will be returned.
	 */
	public static function make_absolute_url( $maybe_relative_path, $url ) {
		if ( empty( $url ) ) {
			return $maybe_relative_path;
		}

if ( ! $url_parts = wp_parse_url( $url ) ) {
			return $maybe_relative_path;
		}

if ( ! $relative_url_parts = wp_parse_url( $maybe_relative_path ) ) {
			return $maybe_relative_path;
		}

// Check for a scheme on the 'relative' url
		if ( ! empty( $relative_url_parts['scheme'] ) ) {
			return $maybe_relative_path;
		}

$absolute_path = $url_parts['scheme'] . '://';

// Schemeless URL's will make it this far, so we check for a host in the relative url and convert it to a protocol-url
		if ( isset( $relative_url_parts['host'] ) ) {
			$absolute_path .= $relative_url_parts['host'];
			if ( isset( $relative_url_parts['port'] ) ) {
				$absolute_path .= ':' . $relative_url_parts['port'];
			}
		} else {
			$absolute_path .= $url_parts['host'];
			if ( isset( $url_parts['port'] ) ) {
				$absolute_path .= ':' . $url_parts['port'];
			}
		}

// Start off with the Absolute URL path.
		$path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/';

// If it's a root-relative path, then great.
		if ( ! empty( $relative_url_parts['path'] ) && '/' == $relative_url_parts['path'][0] ) {
			$path = $relative_url_parts['path'];

// Else it's a relative path.
		} elseif ( ! empty( $relative_url_parts['path'] ) ) {
			// Strip off any file components from the absolute path.
			$path = substr( $path, 0, strrpos( $path, '/' ) + 1 );

// Build the new path.
			$path .= $relative_url_parts['path'];

// Strip all /path/../ out of the path.
			while ( strpos( $path, '../' ) > 1 ) {
				$path = preg_replace( '![^/]+/\.\./!', '', $path );
			}

// Strip any final leading ../ from the path.
			$path = preg_replace( '!^/(\.\./)+!', '', $path );
		}

// Add the Query string.
		if ( ! empty( $relative_url_parts['query'] ) ) {
			$path .= '?' . $relative_url_parts['query'];
		}

return $absolute_path . '/' . ltrim( $path, '/' );
	}

/**
	 * Handles HTTP Redirects and follows them if appropriate.
	 *
	 * @since 3.7.0
	 *
	 * @param string $url The URL which was requested.
	 * @param array $args The Arguments which were used to make the request.
	 * @param array $response The Response of the HTTP request.
	 * @return false|object False if no redirect is present, a WP_HTTP or WP_Error result otherwise.
	 */
	public static function handle_redirects( $url, $args, $response ) {
		// If no redirects are present, or, redirects were not requested, perform no action.
		if ( ! isset( $response['headers']['location'] ) || 0 === $args['_redirection'] ) {
			return false;
		}

// Only perform redirections on redirection http codes.
		if ( $response['response']['code'] > 399 || $response['response']['code'] < 300 ) {
			return false;
		}

// Don't redirect if we've run out of redirects.
		if ( $args['redirection']-- <= 0 ) {
			return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );
		}

$redirect_location = $response['headers']['location'];

// If there were multiple Location headers, use the last header specified.
		if ( is_array( $redirect_location ) ) {
			$redirect_location = array_pop( $redirect_location );
		}

$redirect_location = WP_Http::make_absolute_url( $redirect_location, $url );

// POST requests should not POST to a redirected location.
		if ( 'POST' == $args['method'] ) {
			if ( in_array( $response['response']['code'], array( 302, 303 ) ) ) {
				$args['method'] = 'GET';
			}
		}

// Include valid cookies in the redirect process.
		if ( ! empty( $response['cookies'] ) ) {
			foreach ( $response['cookies'] as $cookie ) {
				if ( $cookie->test( $redirect_location ) ) {
					$args['cookies'][] = $cookie;
				}
			}
		}

return wp_remote_request( $redirect_location, $args );
	}

/**
	 * Determines if a specified string represents an IP address or not.
	 *
	 * This function also detects the type of the IP address, returning either
	 * '4' or '6' to represent a IPv4 and IPv6 address respectively.
	 * This does not verify if the IP is a valid IP, only that it appears to be
	 * an IP address.
	 *
	 * @link http://home.deds.nl/~aeron/regex/ for IPv6 regex
	 *
	 * @since 3.7.0
	 *
	 * @param string $maybe_ip A suspected IP address
	 * @return integer|bool Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure
	 */
	public static function is_ip_address( $maybe_ip ) {
		if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) ) {
			return 4;
		}

if ( false !== strpos( $maybe_ip, ':' ) && preg_match( '/^(((?=.*(::))(?!.*\3.+\3))\3?|([\dA-F]{1,4}(\3|:\b|$)|\2))(?4){5}((?4){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i', trim( $maybe_ip, ' []' ) ) ) {
			return 6;
		}

return false;
	}

}

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