Changeset 33748 for trunk/src/wp-includes/class-wp-http-cookie.php
- Timestamp:
- 08/26/2015 03:55:00 AM (9 years ago)
- File:
-
- 1 copied
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trunk/src/wp-includes/class-wp-http-cookie.php (copied) (copied from trunk/src/wp-includes/class-http.php) (2 diffs)
Legend:
- Unmodified
- Added
- Removed
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trunk/src/wp-includes/class-wp-http-cookie.php
r33746 r33748 1 1 <?php 2 /**3 * Simple and uniform HTTP request API.4 *5 * Standardizes the HTTP requests for WordPress. Handles cookies, gzip encoding and decoding, chunk6 * decoding, if HTTP 1.1 and various other difficult HTTP protocol implementations.7 *8 * @link https://core.trac.wordpress.org/ticket/4779 HTTP API Proposal9 *10 * @package WordPress11 * @subpackage HTTP12 * @since 2.7.013 */14 15 /**16 * WordPress HTTP Class for managing HTTP Transports and making HTTP requests.17 *18 * This class is used to consistently make outgoing HTTP requests easy for developers19 * while still being compatible with the many PHP configurations under which20 * WordPress runs.21 *22 * Debugging includes several actions, which pass different variables for debugging the HTTP API.23 *24 * @package WordPress25 * @subpackage HTTP26 * @since 2.7.027 */28 class WP_Http {29 30 /**31 * Send an HTTP request to a URI.32 *33 * Please note: The only URI that are supported in the HTTP Transport implementation34 * are the HTTP and HTTPS protocols.35 *36 * @access public37 * @since 2.7.038 *39 * @global string $wp_version40 *41 * @param string $url The request URL.42 * @param string|array $args {43 * Optional. Array or string of HTTP request arguments.44 *45 * @type string $method Request method. Accepts 'GET', 'POST', 'HEAD', or 'PUT'.46 * Some transports technically allow others, but should not be47 * assumed. Default 'GET'.48 * @type int $timeout How long the connection should stay open in seconds. Default 5.49 * @type int $redirection Number of allowed redirects. Not supported by all transports50 * Default 5.51 * @type string $httpversion Version of the HTTP protocol to use. Accepts '1.0' and '1.1'.52 * Default '1.0'.53 * @type string $user-agent User-agent value sent.54 * Default WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ).55 * @type bool $reject_unsafe_urls Whether to pass URLs through {@see wp_http_validate_url()}.56 * Default false.57 * @type bool $blocking Whether the calling code requires the result of the request.58 * If set to false, the request will be sent to the remote server,59 * and processing returned to the calling code immediately, the caller60 * will know if the request succeeded or failed, but will not receive61 * any response from the remote server. Default true.62 * @type string|array $headers Array or string of headers to send with the request.63 * Default empty array.64 * @type array $cookies List of cookies to send with the request. Default empty array.65 * @type string|array $body Body to send with the request. Default null.66 * @type bool $compress Whether to compress the $body when sending the request.67 * Default false.68 * @type bool $decompress Whether to decompress a compressed response. If set to false and69 * compressed content is returned in the response anyway, it will70 * need to be separately decompressed. Default true.71 * @type bool $sslverify Whether to verify SSL for the request. Default true.72 * @type string sslcertificates Absolute path to an SSL certificate .crt file.73 * Default ABSPATH . WPINC . '/certificates/ca-bundle.crt'.74 * @type bool $stream Whether to stream to a file. If set to true and no filename was75 * given, it will be droped it in the WP temp dir and its name will76 * be set using the basename of the URL. Default false.77 * @type string $filename Filename of the file to write to when streaming. $stream must be78 * set to true. Default null.79 * @type int $limit_response_size Size in bytes to limit the response to. Default null.80 *81 * }82 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'.83 * A WP_Error instance upon error.84 */85 public function request( $url, $args = array() ) {86 global $wp_version;87 88 $defaults = array(89 'method' => 'GET',90 /**91 * Filter the timeout value for an HTTP request.92 *93 * @since 2.7.094 *95 * @param int $timeout_value Time in seconds until a request times out.96 * Default 5.97 */98 'timeout' => apply_filters( 'http_request_timeout', 5 ),99 /**100 * Filter the number of redirects allowed during an HTTP request.101 *102 * @since 2.7.0103 *104 * @param int $redirect_count Number of redirects allowed. Default 5.105 */106 'redirection' => apply_filters( 'http_request_redirection_count', 5 ),107 /**108 * Filter the version of the HTTP protocol used in a request.109 *110 * @since 2.7.0111 *112 * @param string $version Version of HTTP used. Accepts '1.0' and '1.1'.113 * Default '1.0'.114 */115 'httpversion' => apply_filters( 'http_request_version', '1.0' ),116 /**117 * Filter the user agent value sent with an HTTP request.118 *119 * @since 2.7.0120 *121 * @param string $user_agent WordPress user agent string.122 */123 'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ),124 /**125 * Filter whether to pass URLs through wp_http_validate_url() in an HTTP request.126 *127 * @since 3.6.0128 *129 * @param bool $pass_url Whether to pass URLs through wp_http_validate_url().130 * Default false.131 */132 'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false ),133 'blocking' => true,134 'headers' => array(),135 'cookies' => array(),136 'body' => null,137 'compress' => false,138 'decompress' => true,139 'sslverify' => true,140 'sslcertificates' => ABSPATH . WPINC . '/certificates/ca-bundle.crt',141 'stream' => false,142 'filename' => null,143 'limit_response_size' => null,144 );145 146 // Pre-parse for the HEAD checks.147 $args = wp_parse_args( $args );148 149 // By default, Head requests do not cause redirections.150 if ( isset($args['method']) && 'HEAD' == $args['method'] )151 $defaults['redirection'] = 0;152 153 $r = wp_parse_args( $args, $defaults );154 /**155 * Filter the arguments used in an HTTP request.156 *157 * @since 2.7.0158 *159 * @param array $r An array of HTTP request arguments.160 * @param string $url The request URL.161 */162 $r = apply_filters( 'http_request_args', $r, $url );163 164 // The transports decrement this, store a copy of the original value for loop purposes.165 if ( ! isset( $r['_redirection'] ) )166 $r['_redirection'] = $r['redirection'];167 168 /**169 * Filter whether to preempt an HTTP request's return.170 *171 * Returning a truthy value to the filter will short-circuit172 * the HTTP request and return early with that value.173 *174 * @since 2.9.0175 *176 * @param bool $preempt Whether to preempt an HTTP request return. Default false.177 * @param array $r HTTP request arguments.178 * @param string $url The request URL.179 */180 $pre = apply_filters( 'pre_http_request', false, $r, $url );181 if ( false !== $pre )182 return $pre;183 184 if ( function_exists( 'wp_kses_bad_protocol' ) ) {185 if ( $r['reject_unsafe_urls'] )186 $url = wp_http_validate_url( $url );187 if ( $url ) {188 $url = wp_kses_bad_protocol( $url, array( 'http', 'https', 'ssl' ) );189 }190 }191 192 $arrURL = @parse_url( $url );193 194 if ( empty( $url ) || empty( $arrURL['scheme'] ) )195 return new WP_Error('http_request_failed', __('A valid URL was not provided.'));196 197 if ( $this->block_request( $url ) )198 return new WP_Error( 'http_request_failed', __( 'User has blocked requests through HTTP.' ) );199 200 /*201 * Determine if this is a https call and pass that on to the transport functions202 * so that we can blacklist the transports that do not support ssl verification203 */204 $r['ssl'] = $arrURL['scheme'] == 'https' || $arrURL['scheme'] == 'ssl';205 206 // Determine if this request is to OUR install of WordPress.207 $homeURL = parse_url( get_bloginfo( 'url' ) );208 $r['local'] = 'localhost' == $arrURL['host'] || ( isset( $homeURL['host'] ) && $homeURL['host'] == $arrURL['host'] );209 unset( $homeURL );210 211 /*212 * If we are streaming to a file but no filename was given drop it in the WP temp dir213 * and pick its name using the basename of the $url.214 */215 if ( $r['stream'] && empty( $r['filename'] ) ) {216 $r['filename'] = get_temp_dir() . wp_unique_filename( get_temp_dir(), basename( $url ) );217 }218 219 /*220 * Force some settings if we are streaming to a file and check for existence and perms221 * of destination directory.222 */223 if ( $r['stream'] ) {224 $r['blocking'] = true;225 if ( ! wp_is_writable( dirname( $r['filename'] ) ) )226 return new WP_Error( 'http_request_failed', __( 'Destination directory for file streaming does not exist or is not writable.' ) );227 }228 229 if ( is_null( $r['headers'] ) )230 $r['headers'] = array();231 232 if ( ! is_array( $r['headers'] ) ) {233 $processedHeaders = self::processHeaders( $r['headers'], $url );234 $r['headers'] = $processedHeaders['headers'];235 }236 237 if ( isset( $r['headers']['User-Agent'] ) ) {238 $r['user-agent'] = $r['headers']['User-Agent'];239 unset( $r['headers']['User-Agent'] );240 }241 242 if ( isset( $r['headers']['user-agent'] ) ) {243 $r['user-agent'] = $r['headers']['user-agent'];244 unset( $r['headers']['user-agent'] );245 }246 247 if ( '1.1' == $r['httpversion'] && !isset( $r['headers']['connection'] ) ) {248 $r['headers']['connection'] = 'close';249 }250 251 // Construct Cookie: header if any cookies are set.252 self::buildCookieHeader( $r );253 254 // Avoid issues where mbstring.func_overload is enabled.255 mbstring_binary_safe_encoding();256 257 if ( ! isset( $r['headers']['Accept-Encoding'] ) ) {258 if ( $encoding = WP_Http_Encoding::accept_encoding( $url, $r ) )259 $r['headers']['Accept-Encoding'] = $encoding;260 }261 262 if ( ( ! is_null( $r['body'] ) && '' != $r['body'] ) || 'POST' == $r['method'] || 'PUT' == $r['method'] ) {263 if ( is_array( $r['body'] ) || is_object( $r['body'] ) ) {264 $r['body'] = http_build_query( $r['body'], null, '&' );265 266 if ( ! isset( $r['headers']['Content-Type'] ) )267 $r['headers']['Content-Type'] = 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' );268 }269 270 if ( '' === $r['body'] )271 $r['body'] = null;272 273 if ( ! isset( $r['headers']['Content-Length'] ) && ! isset( $r['headers']['content-length'] ) )274 $r['headers']['Content-Length'] = strlen( $r['body'] );275 }276 277 $response = $this->_dispatch_request( $url, $r );278 279 reset_mbstring_encoding();280 281 if ( is_wp_error( $response ) )282 return $response;283 284 // Append cookies that were used in this request to the response285 if ( ! empty( $r['cookies'] ) ) {286 $cookies_set = wp_list_pluck( $response['cookies'], 'name' );287 foreach ( $r['cookies'] as $cookie ) {288 if ( ! in_array( $cookie->name, $cookies_set ) && $cookie->test( $url ) ) {289 $response['cookies'][] = $cookie;290 }291 }292 }293 294 return $response;295 }296 297 /**298 * Tests which transports are capable of supporting the request.299 *300 * @since 3.2.0301 * @access private302 *303 * @param array $args Request arguments304 * @param string $url URL to Request305 *306 * @return string|false Class name for the first transport that claims to support the request. False if no transport claims to support the request.307 */308 public function _get_first_available_transport( $args, $url = null ) {309 /**310 * Filter which HTTP transports are available and in what order.311 *312 * @since 3.7.0313 *314 * @param array $value Array of HTTP transports to check. Default array contains315 * 'curl', and 'streams', in that order.316 * @param array $args HTTP request arguments.317 * @param string $url The URL to request.318 */319 $request_order = apply_filters( 'http_api_transports', array( 'curl', 'streams' ), $args, $url );320 321 // Loop over each transport on each HTTP request looking for one which will serve this request's needs.322 foreach ( $request_order as $transport ) {323 $class = 'WP_HTTP_' . $transport;324 325 // Check to see if this transport is a possibility, calls the transport statically.326 if ( !call_user_func( array( $class, 'test' ), $args, $url ) )327 continue;328 329 return $class;330 }331 332 return false;333 }334 335 /**336 * Dispatches a HTTP request to a supporting transport.337 *338 * Tests each transport in order to find a transport which matches the request arguments.339 * Also caches the transport instance to be used later.340 *341 * The order for requests is cURL, and then PHP Streams.342 *343 * @since 3.2.0344 *345 * @static346 * @access private347 *348 * @param string $url URL to Request349 * @param array $args Request arguments350 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error351 */352 private function _dispatch_request( $url, $args ) {353 static $transports = array();354 355 $class = $this->_get_first_available_transport( $args, $url );356 if ( !$class )357 return new WP_Error( 'http_failure', __( 'There are no HTTP transports available which can complete the requested request.' ) );358 359 // Transport claims to support request, instantiate it and give it a whirl.360 if ( empty( $transports[$class] ) )361 $transports[$class] = new $class;362 363 $response = $transports[$class]->request( $url, $args );364 365 /**366 * Fires after an HTTP API response is received and before the response is returned.367 *368 * @since 2.8.0369 *370 * @param array|WP_Error $response HTTP response or WP_Error object.371 * @param string $context Context under which the hook is fired.372 * @param string $class HTTP transport used.373 * @param array $args HTTP request arguments.374 * @param string $url The request URL.375 */376 do_action( 'http_api_debug', $response, 'response', $class, $args, $url );377 378 if ( is_wp_error( $response ) )379 return $response;380 381 /**382 * Filter the HTTP API response immediately before the response is returned.383 *384 * @since 2.9.0385 *386 * @param array $response HTTP response.387 * @param array $args HTTP request arguments.388 * @param string $url The request URL.389 */390 return apply_filters( 'http_response', $response, $args, $url );391 }392 393 /**394 * Uses the POST HTTP method.395 *396 * Used for sending data that is expected to be in the body.397 *398 * @access public399 * @since 2.7.0400 *401 * @param string $url The request URL.402 * @param string|array $args Optional. Override the defaults.403 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error404 */405 public function post($url, $args = array()) {406 $defaults = array('method' => 'POST');407 $r = wp_parse_args( $args, $defaults );408 return $this->request($url, $r);409 }410 411 /**412 * Uses the GET HTTP method.413 *414 * Used for sending data that is expected to be in the body.415 *416 * @access public417 * @since 2.7.0418 *419 * @param string $url The request URL.420 * @param string|array $args Optional. Override the defaults.421 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error422 */423 public function get($url, $args = array()) {424 $defaults = array('method' => 'GET');425 $r = wp_parse_args( $args, $defaults );426 return $this->request($url, $r);427 }428 429 /**430 * Uses the HEAD HTTP method.431 *432 * Used for sending data that is expected to be in the body.433 *434 * @access public435 * @since 2.7.0436 *437 * @param string $url The request URL.438 * @param string|array $args Optional. Override the defaults.439 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error440 */441 public function head($url, $args = array()) {442 $defaults = array('method' => 'HEAD');443 $r = wp_parse_args( $args, $defaults );444 return $this->request($url, $r);445 }446 447 /**448 * Parses the responses and splits the parts into headers and body.449 *450 * @access public451 * @static452 * @since 2.7.0453 *454 * @param string $strResponse The full response string455 * @return array Array with 'headers' and 'body' keys.456 */457 public static function processResponse($strResponse) {458 $res = explode("\r\n\r\n", $strResponse, 2);459 460 return array('headers' => $res[0], 'body' => isset($res[1]) ? $res[1] : '');461 }462 463 /**464 * Transform header string into an array.465 *466 * If an array is given then it is assumed to be raw header data with numeric keys with the467 * headers as the values. No headers must be passed that were already processed.468 *469 * @access public470 * @static471 * @since 2.7.0472 *473 * @param string|array $headers474 * @param string $url The URL that was requested475 * @return array Processed string headers. If duplicate headers are encountered,476 * Then a numbered array is returned as the value of that header-key.477 */478 public static function processHeaders( $headers, $url = '' ) {479 // Split headers, one per array element.480 if ( is_string($headers) ) {481 // Tolerate line terminator: CRLF = LF (RFC 2616 19.3).482 $headers = str_replace("\r\n", "\n", $headers);483 /*484 * Unfold folded header fields. LWS = [CRLF] 1*( SP | HT ) <US-ASCII SP, space (32)>,485 * <US-ASCII HT, horizontal-tab (9)> (RFC 2616 2.2).486 */487 $headers = preg_replace('/\n[ \t]/', ' ', $headers);488 // Create the headers array.489 $headers = explode("\n", $headers);490 }491 492 $response = array('code' => 0, 'message' => '');493 494 /*495 * If a redirection has taken place, The headers for each page request may have been passed.496 * In this case, determine the final HTTP header and parse from there.497 */498 for ( $i = count($headers)-1; $i >= 0; $i-- ) {499 if ( !empty($headers[$i]) && false === strpos($headers[$i], ':') ) {500 $headers = array_splice($headers, $i);501 break;502 }503 }504 505 $cookies = array();506 $newheaders = array();507 foreach ( (array) $headers as $tempheader ) {508 if ( empty($tempheader) )509 continue;510 511 if ( false === strpos($tempheader, ':') ) {512 $stack = explode(' ', $tempheader, 3);513 $stack[] = '';514 list( , $response['code'], $response['message']) = $stack;515 continue;516 }517 518 list($key, $value) = explode(':', $tempheader, 2);519 520 $key = strtolower( $key );521 $value = trim( $value );522 523 if ( isset( $newheaders[ $key ] ) ) {524 if ( ! is_array( $newheaders[ $key ] ) )525 $newheaders[$key] = array( $newheaders[ $key ] );526 $newheaders[ $key ][] = $value;527 } else {528 $newheaders[ $key ] = $value;529 }530 if ( 'set-cookie' == $key )531 $cookies[] = new WP_Http_Cookie( $value, $url );532 }533 534 // Cast the Response Code to an int535 $response['code'] = intval( $response['code'] );536 537 return array('response' => $response, 'headers' => $newheaders, 'cookies' => $cookies);538 }539 540 /**541 * Takes the arguments for a ::request() and checks for the cookie array.542 *543 * If it's found, then it upgrades any basic name => value pairs to WP_Http_Cookie instances,544 * which are each parsed into strings and added to the Cookie: header (within the arguments array).545 * Edits the array by reference.546 *547 * @access public548 * @version 2.8.0549 * @static550 *551 * @param array $r Full array of args passed into ::request()552 */553 public static function buildCookieHeader( &$r ) {554 if ( ! empty($r['cookies']) ) {555 // Upgrade any name => value cookie pairs to WP_HTTP_Cookie instances.556 foreach ( $r['cookies'] as $name => $value ) {557 if ( ! is_object( $value ) )558 $r['cookies'][ $name ] = new WP_HTTP_Cookie( array( 'name' => $name, 'value' => $value ) );559 }560 561 $cookies_header = '';562 foreach ( (array) $r['cookies'] as $cookie ) {563 $cookies_header .= $cookie->getHeaderValue() . '; ';564 }565 566 $cookies_header = substr( $cookies_header, 0, -2 );567 $r['headers']['cookie'] = $cookies_header;568 }569 }570 571 /**572 * Decodes chunk transfer-encoding, based off the HTTP 1.1 specification.573 *574 * Based off the HTTP http_encoding_dechunk function.575 *576 * @link http://tools.ietf.org/html/rfc2616#section-19.4.6 Process for chunked decoding.577 *578 * @access public579 * @since 2.7.0580 * @static581 *582 * @param string $body Body content583 * @return string Chunked decoded body on success or raw body on failure.584 */585 public static function chunkTransferDecode( $body ) {586 // The body is not chunked encoded or is malformed.587 if ( ! preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', trim( $body ) ) )588 return $body;589 590 $parsed_body = '';591 592 // We'll be altering $body, so need a backup in case of error.593 $body_original = $body;594 595 while ( true ) {596 $has_chunk = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $body, $match );597 if ( ! $has_chunk || empty( $match[1] ) )598 return $body_original;599 600 $length = hexdec( $match[1] );601 $chunk_length = strlen( $match[0] );602 603 // Parse out the chunk of data.604 $parsed_body .= substr( $body, $chunk_length, $length );605 606 // Remove the chunk from the raw data.607 $body = substr( $body, $length + $chunk_length );608 609 // End of the document.610 if ( '0' === trim( $body ) )611 return $parsed_body;612 }613 }614 615 /**616 * Block requests through the proxy.617 *618 * Those who are behind a proxy and want to prevent access to certain hosts may do so. This will619 * prevent plugins from working and core functionality, if you don't include api.wordpress.org.620 *621 * You block external URL requests by defining WP_HTTP_BLOCK_EXTERNAL as true in your wp-config.php622 * file and this will only allow localhost and your blog to make requests. The constant623 * WP_ACCESSIBLE_HOSTS will allow additional hosts to go through for requests. The format of the624 * WP_ACCESSIBLE_HOSTS constant is a comma separated list of hostnames to allow, wildcard domains625 * are supported, eg *.wordpress.org will allow for all subdomains of wordpress.org to be contacted.626 *627 * @since 2.8.0628 * @link https://core.trac.wordpress.org/ticket/8927 Allow preventing external requests.629 * @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_ACCESSIBLE_HOSTS630 *631 * @staticvar array|null $accessible_hosts632 * @staticvar array $wildcard_regex633 *634 * @param string $uri URI of url.635 * @return bool True to block, false to allow.636 */637 public function block_request($uri) {638 // We don't need to block requests, because nothing is blocked.639 if ( ! defined( 'WP_HTTP_BLOCK_EXTERNAL' ) || ! WP_HTTP_BLOCK_EXTERNAL )640 return false;641 642 $check = parse_url($uri);643 if ( ! $check )644 return true;645 646 $home = parse_url( get_option('siteurl') );647 648 // Don't block requests back to ourselves by default.649 if ( 'localhost' == $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) ) {650 /**651 * Filter whether to block local requests through the proxy.652 *653 * @since 2.8.0654 *655 * @param bool $block Whether to block local requests through proxy.656 * Default false.657 */658 return apply_filters( 'block_local_requests', false );659 }660 661 if ( !defined('WP_ACCESSIBLE_HOSTS') )662 return true;663 664 static $accessible_hosts = null;665 static $wildcard_regex = array();666 if ( null === $accessible_hosts ) {667 $accessible_hosts = preg_split('|,\s*|', WP_ACCESSIBLE_HOSTS);668 669 if ( false !== strpos(WP_ACCESSIBLE_HOSTS, '*') ) {670 $wildcard_regex = array();671 foreach ( $accessible_hosts as $host )672 $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );673 $wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i';674 }675 }676 677 if ( !empty($wildcard_regex) )678 return !preg_match($wildcard_regex, $check['host']);679 else680 return !in_array( $check['host'], $accessible_hosts ); //Inverse logic, If it's in the array, then we can't access it.681 682 }683 684 /**685 * A wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7686 *687 * PHP 5.4.7 expanded parse_url()'s ability to handle non-absolute url's, including688 * schemeless and relative url's with :// in the path, this works around those689 * limitations providing a standard output on PHP 5.2~5.4+.690 *691 * Error suppression is used as prior to PHP 5.3.3, an E_WARNING would be generated692 * when URL parsing failed.693 *694 * @since 4.1.0695 *696 * @static697 * @access protected698 *699 * @param string $url The URL to parse.700 * @return bool|array False on failure; Array of URL components on success;701 * See parse_url()'s return values.702 */703 protected static function parse_url( $url ) {704 $parts = @parse_url( $url );705 if ( ! $parts ) {706 // < PHP 5.4.7 compat, trouble with relative paths including a scheme break in the path707 if ( '/' == $url[0] && false !== strpos( $url, '://' ) ) {708 // Since we know it's a relative path, prefix with a scheme/host placeholder and try again709 if ( ! $parts = @parse_url( 'placeholder://placeholder' . $url ) ) {710 return $parts;711 }712 // Remove the placeholder values713 unset( $parts['scheme'], $parts['host'] );714 } else {715 return $parts;716 }717 }718 719 // < PHP 5.4.7 compat, doesn't detect schemeless URL's host field720 if ( '//' == substr( $url, 0, 2 ) && ! isset( $parts['host'] ) ) {721 list( $parts['host'], $slashless_path ) = explode( '/', substr( $parts['path'], 2 ), 2 );722 $parts['path'] = "/{$slashless_path}";723 }724 725 return $parts;726 }727 728 /**729 * Converts a relative URL to an absolute URL relative to a given URL.730 *731 * If an Absolute URL is provided, no processing of that URL is done.732 *733 * @since 3.4.0734 *735 * @static736 * @access public737 *738 * @param string $maybe_relative_path The URL which might be relative739 * @param string $url The URL which $maybe_relative_path is relative to740 * @return string An Absolute URL, in a failure condition where the URL cannot be parsed, the relative URL will be returned.741 */742 public static function make_absolute_url( $maybe_relative_path, $url ) {743 if ( empty( $url ) )744 return $maybe_relative_path;745 746 if ( ! $url_parts = WP_HTTP::parse_url( $url ) ) {747 return $maybe_relative_path;748 }749 750 if ( ! $relative_url_parts = WP_HTTP::parse_url( $maybe_relative_path ) ) {751 return $maybe_relative_path;752 }753 754 // Check for a scheme on the 'relative' url755 if ( ! empty( $relative_url_parts['scheme'] ) ) {756 return $maybe_relative_path;757 }758 759 $absolute_path = $url_parts['scheme'] . '://';760 761 // Schemeless URL's will make it this far, so we check for a host in the relative url and convert it to a protocol-url762 if ( isset( $relative_url_parts['host'] ) ) {763 $absolute_path .= $relative_url_parts['host'];764 if ( isset( $relative_url_parts['port'] ) )765 $absolute_path .= ':' . $relative_url_parts['port'];766 } else {767 $absolute_path .= $url_parts['host'];768 if ( isset( $url_parts['port'] ) )769 $absolute_path .= ':' . $url_parts['port'];770 }771 772 // Start off with the Absolute URL path.773 $path = ! empty( $url_parts['path'] ) ? $url_parts['path'] : '/';774 775 // If it's a root-relative path, then great.776 if ( ! empty( $relative_url_parts['path'] ) && '/' == $relative_url_parts['path'][0] ) {777 $path = $relative_url_parts['path'];778 779 // Else it's a relative path.780 } elseif ( ! empty( $relative_url_parts['path'] ) ) {781 // Strip off any file components from the absolute path.782 $path = substr( $path, 0, strrpos( $path, '/' ) + 1 );783 784 // Build the new path.785 $path .= $relative_url_parts['path'];786 787 // Strip all /path/../ out of the path.788 while ( strpos( $path, '../' ) > 1 ) {789 $path = preg_replace( '![^/]+/\.\./!', '', $path );790 }791 792 // Strip any final leading ../ from the path.793 $path = preg_replace( '!^/(\.\./)+!', '', $path );794 }795 796 // Add the Query string.797 if ( ! empty( $relative_url_parts['query'] ) )798 $path .= '?' . $relative_url_parts['query'];799 800 return $absolute_path . '/' . ltrim( $path, '/' );801 }802 803 /**804 * Handles HTTP Redirects and follows them if appropriate.805 *806 * @since 3.7.0807 *808 * @static809 *810 * @param string $url The URL which was requested.811 * @param array $args The Arguments which were used to make the request.812 * @param array $response The Response of the HTTP request.813 * @return false|object False if no redirect is present, a WP_HTTP or WP_Error result otherwise.814 */815 public static function handle_redirects( $url, $args, $response ) {816 // If no redirects are present, or, redirects were not requested, perform no action.817 if ( ! isset( $response['headers']['location'] ) || 0 === $args['_redirection'] )818 return false;819 820 // Only perform redirections on redirection http codes.821 if ( $response['response']['code'] > 399 || $response['response']['code'] < 300 )822 return false;823 824 // Don't redirect if we've run out of redirects.825 if ( $args['redirection']-- <= 0 )826 return new WP_Error( 'http_request_failed', __('Too many redirects.') );827 828 $redirect_location = $response['headers']['location'];829 830 // If there were multiple Location headers, use the last header specified.831 if ( is_array( $redirect_location ) )832 $redirect_location = array_pop( $redirect_location );833 834 $redirect_location = WP_HTTP::make_absolute_url( $redirect_location, $url );835 836 // POST requests should not POST to a redirected location.837 if ( 'POST' == $args['method'] ) {838 if ( in_array( $response['response']['code'], array( 302, 303 ) ) )839 $args['method'] = 'GET';840 }841 842 // Include valid cookies in the redirect process.843 if ( ! empty( $response['cookies'] ) ) {844 foreach ( $response['cookies'] as $cookie ) {845 if ( $cookie->test( $redirect_location ) )846 $args['cookies'][] = $cookie;847 }848 }849 850 return wp_remote_request( $redirect_location, $args );851 }852 853 /**854 * Determines if a specified string represents an IP address or not.855 *856 * This function also detects the type of the IP address, returning either857 * '4' or '6' to represent a IPv4 and IPv6 address respectively.858 * This does not verify if the IP is a valid IP, only that it appears to be859 * an IP address.860 *861 * @see http://home.deds.nl/~aeron/regex/ for IPv6 regex862 *863 * @since 3.7.0864 * @static865 *866 * @param string $maybe_ip A suspected IP address867 * @return integer|bool Upon success, '4' or '6' to represent a IPv4 or IPv6 address, false upon failure868 */869 public static function is_ip_address( $maybe_ip ) {870 if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $maybe_ip ) )871 return 4;872 873 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, ' []' ) ) )874 return 6;875 876 return false;877 }878 879 }880 881 /**882 * HTTP request method uses PHP Streams to retrieve the url.883 *884 * @since 2.7.0885 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().886 */887 class WP_Http_Streams {888 /**889 * Send a HTTP request to a URI using PHP Streams.890 *891 * @see WP_Http::request For default options descriptions.892 *893 * @since 2.7.0894 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().895 *896 * @access public897 * @param string $url The request URL.898 * @param string|array $args Optional. Override the defaults.899 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error900 */901 public function request($url, $args = array()) {902 $defaults = array(903 'method' => 'GET', 'timeout' => 5,904 'redirection' => 5, 'httpversion' => '1.0',905 'blocking' => true,906 'headers' => array(), 'body' => null, 'cookies' => array()907 );908 909 $r = wp_parse_args( $args, $defaults );910 911 if ( isset( $r['headers']['User-Agent'] ) ) {912 $r['user-agent'] = $r['headers']['User-Agent'];913 unset( $r['headers']['User-Agent'] );914 } elseif ( isset( $r['headers']['user-agent'] ) ) {915 $r['user-agent'] = $r['headers']['user-agent'];916 unset( $r['headers']['user-agent'] );917 }918 919 // Construct Cookie: header if any cookies are set.920 WP_Http::buildCookieHeader( $r );921 922 $arrURL = parse_url($url);923 924 $connect_host = $arrURL['host'];925 926 $secure_transport = ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' );927 if ( ! isset( $arrURL['port'] ) ) {928 if ( $arrURL['scheme'] == 'ssl' || $arrURL['scheme'] == 'https' ) {929 $arrURL['port'] = 443;930 $secure_transport = true;931 } else {932 $arrURL['port'] = 80;933 }934 }935 936 // Always pass a Path, defaulting to the root in cases such as http://example.com937 if ( ! isset( $arrURL['path'] ) ) {938 $arrURL['path'] = '/';939 }940 941 if ( isset( $r['headers']['Host'] ) || isset( $r['headers']['host'] ) ) {942 if ( isset( $r['headers']['Host'] ) )943 $arrURL['host'] = $r['headers']['Host'];944 else945 $arrURL['host'] = $r['headers']['host'];946 unset( $r['headers']['Host'], $r['headers']['host'] );947 }948 949 /*950 * Certain versions of PHP have issues with 'localhost' and IPv6, It attempts to connect951 * to ::1, which fails when the server is not set up for it. For compatibility, always952 * connect to the IPv4 address.953 */954 if ( 'localhost' == strtolower( $connect_host ) )955 $connect_host = '127.0.0.1';956 957 $connect_host = $secure_transport ? 'ssl://' . $connect_host : 'tcp://' . $connect_host;958 959 $is_local = isset( $r['local'] ) && $r['local'];960 $ssl_verify = isset( $r['sslverify'] ) && $r['sslverify'];961 if ( $is_local ) {962 /**963 * Filter whether SSL should be verified for local requests.964 *965 * @since 2.8.0966 *967 * @param bool $ssl_verify Whether to verify the SSL connection. Default true.968 */969 $ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify );970 } elseif ( ! $is_local ) {971 /**972 * Filter whether SSL should be verified for non-local requests.973 *974 * @since 2.8.0975 *976 * @param bool $ssl_verify Whether to verify the SSL connection. Default true.977 */978 $ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify );979 }980 981 $proxy = new WP_HTTP_Proxy();982 983 $context = stream_context_create( array(984 'ssl' => array(985 'verify_peer' => $ssl_verify,986 //'CN_match' => $arrURL['host'], // This is handled by self::verify_ssl_certificate()987 'capture_peer_cert' => $ssl_verify,988 'SNI_enabled' => true,989 'cafile' => $r['sslcertificates'],990 'allow_self_signed' => ! $ssl_verify,991 )992 ) );993 994 $timeout = (int) floor( $r['timeout'] );995 $utimeout = $timeout == $r['timeout'] ? 0 : 1000000 * $r['timeout'] % 1000000;996 $connect_timeout = max( $timeout, 1 );997 998 // Store error number.999 $connection_error = null;1000 1001 // Store error string.1002 $connection_error_str = null;1003 1004 if ( !WP_DEBUG ) {1005 // In the event that the SSL connection fails, silence the many PHP Warnings.1006 if ( $secure_transport )1007 $error_reporting = error_reporting(0);1008 1009 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )1010 $handle = @stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );1011 else1012 $handle = @stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );1013 1014 if ( $secure_transport )1015 error_reporting( $error_reporting );1016 1017 } else {1018 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) )1019 $handle = stream_socket_client( 'tcp://' . $proxy->host() . ':' . $proxy->port(), $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );1020 else1021 $handle = stream_socket_client( $connect_host . ':' . $arrURL['port'], $connection_error, $connection_error_str, $connect_timeout, STREAM_CLIENT_CONNECT, $context );1022 }1023 1024 if ( false === $handle ) {1025 // SSL connection failed due to expired/invalid cert, or, OpenSSL configuration is broken.1026 if ( $secure_transport && 0 === $connection_error && '' === $connection_error_str )1027 return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );1028 1029 return new WP_Error('http_request_failed', $connection_error . ': ' . $connection_error_str );1030 }1031 1032 // Verify that the SSL certificate is valid for this request.1033 if ( $secure_transport && $ssl_verify && ! $proxy->is_enabled() ) {1034 if ( ! self::verify_ssl_certificate( $handle, $arrURL['host'] ) )1035 return new WP_Error( 'http_request_failed', __( 'The SSL certificate for the host could not be verified.' ) );1036 }1037 1038 stream_set_timeout( $handle, $timeout, $utimeout );1039 1040 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) //Some proxies require full URL in this field.1041 $requestPath = $url;1042 else1043 $requestPath = $arrURL['path'] . ( isset($arrURL['query']) ? '?' . $arrURL['query'] : '' );1044 1045 $strHeaders = strtoupper($r['method']) . ' ' . $requestPath . ' HTTP/' . $r['httpversion'] . "\r\n";1046 1047 $include_port_in_host_header = (1048 ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) ||1049 ( 'http' == $arrURL['scheme'] && 80 != $arrURL['port'] ) ||1050 ( 'https' == $arrURL['scheme'] && 443 != $arrURL['port'] )1051 );1052 1053 if ( $include_port_in_host_header ) {1054 $strHeaders .= 'Host: ' . $arrURL['host'] . ':' . $arrURL['port'] . "\r\n";1055 } else {1056 $strHeaders .= 'Host: ' . $arrURL['host'] . "\r\n";1057 }1058 1059 if ( isset($r['user-agent']) )1060 $strHeaders .= 'User-agent: ' . $r['user-agent'] . "\r\n";1061 1062 if ( is_array($r['headers']) ) {1063 foreach ( (array) $r['headers'] as $header => $headerValue )1064 $strHeaders .= $header . ': ' . $headerValue . "\r\n";1065 } else {1066 $strHeaders .= $r['headers'];1067 }1068 1069 if ( $proxy->use_authentication() )1070 $strHeaders .= $proxy->authentication_header() . "\r\n";1071 1072 $strHeaders .= "\r\n";1073 1074 if ( ! is_null($r['body']) )1075 $strHeaders .= $r['body'];1076 1077 fwrite($handle, $strHeaders);1078 1079 if ( ! $r['blocking'] ) {1080 stream_set_blocking( $handle, 0 );1081 fclose( $handle );1082 return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );1083 }1084 1085 $strResponse = '';1086 $bodyStarted = false;1087 $keep_reading = true;1088 $block_size = 4096;1089 if ( isset( $r['limit_response_size'] ) )1090 $block_size = min( $block_size, $r['limit_response_size'] );1091 1092 // If streaming to a file setup the file handle.1093 if ( $r['stream'] ) {1094 if ( ! WP_DEBUG )1095 $stream_handle = @fopen( $r['filename'], 'w+' );1096 else1097 $stream_handle = fopen( $r['filename'], 'w+' );1098 if ( ! $stream_handle )1099 return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );1100 1101 $bytes_written = 0;1102 while ( ! feof($handle) && $keep_reading ) {1103 $block = fread( $handle, $block_size );1104 if ( ! $bodyStarted ) {1105 $strResponse .= $block;1106 if ( strpos( $strResponse, "\r\n\r\n" ) ) {1107 $process = WP_Http::processResponse( $strResponse );1108 $bodyStarted = true;1109 $block = $process['body'];1110 unset( $strResponse );1111 $process['body'] = '';1112 }1113 }1114 1115 $this_block_size = strlen( $block );1116 1117 if ( isset( $r['limit_response_size'] ) && ( $bytes_written + $this_block_size ) > $r['limit_response_size'] ) {1118 $this_block_size = ( $r['limit_response_size'] - $bytes_written );1119 $block = substr( $block, 0, $this_block_size );1120 }1121 1122 $bytes_written_to_file = fwrite( $stream_handle, $block );1123 1124 if ( $bytes_written_to_file != $this_block_size ) {1125 fclose( $handle );1126 fclose( $stream_handle );1127 return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );1128 }1129 1130 $bytes_written += $bytes_written_to_file;1131 1132 $keep_reading = !isset( $r['limit_response_size'] ) || $bytes_written < $r['limit_response_size'];1133 }1134 1135 fclose( $stream_handle );1136 1137 } else {1138 $header_length = 0;1139 while ( ! feof( $handle ) && $keep_reading ) {1140 $block = fread( $handle, $block_size );1141 $strResponse .= $block;1142 if ( ! $bodyStarted && strpos( $strResponse, "\r\n\r\n" ) ) {1143 $header_length = strpos( $strResponse, "\r\n\r\n" ) + 4;1144 $bodyStarted = true;1145 }1146 $keep_reading = ( ! $bodyStarted || !isset( $r['limit_response_size'] ) || strlen( $strResponse ) < ( $header_length + $r['limit_response_size'] ) );1147 }1148 1149 $process = WP_Http::processResponse( $strResponse );1150 unset( $strResponse );1151 1152 }1153 1154 fclose( $handle );1155 1156 $arrHeaders = WP_Http::processHeaders( $process['headers'], $url );1157 1158 $response = array(1159 'headers' => $arrHeaders['headers'],1160 // Not yet processed.1161 'body' => null,1162 'response' => $arrHeaders['response'],1163 'cookies' => $arrHeaders['cookies'],1164 'filename' => $r['filename']1165 );1166 1167 // Handle redirects.1168 if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) )1169 return $redirect_response;1170 1171 // If the body was chunk encoded, then decode it.1172 if ( ! empty( $process['body'] ) && isset( $arrHeaders['headers']['transfer-encoding'] ) && 'chunked' == $arrHeaders['headers']['transfer-encoding'] )1173 $process['body'] = WP_Http::chunkTransferDecode($process['body']);1174 1175 if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($arrHeaders['headers']) )1176 $process['body'] = WP_Http_Encoding::decompress( $process['body'] );1177 1178 if ( isset( $r['limit_response_size'] ) && strlen( $process['body'] ) > $r['limit_response_size'] )1179 $process['body'] = substr( $process['body'], 0, $r['limit_response_size'] );1180 1181 $response['body'] = $process['body'];1182 1183 return $response;1184 }1185 1186 /**1187 * Verifies the received SSL certificate against it's Common Names and subjectAltName fields1188 *1189 * PHP's SSL verifications only verify that it's a valid Certificate, it doesn't verify if1190 * the certificate is valid for the hostname which was requested.1191 * This function verifies the requested hostname against certificate's subjectAltName field,1192 * if that is empty, or contains no DNS entries, a fallback to the Common Name field is used.1193 *1194 * IP Address support is included if the request is being made to an IP address.1195 *1196 * @since 3.7.01197 * @static1198 *1199 * @param stream $stream The PHP Stream which the SSL request is being made over1200 * @param string $host The hostname being requested1201 * @return bool If the cerficiate presented in $stream is valid for $host1202 */1203 public static function verify_ssl_certificate( $stream, $host ) {1204 $context_options = stream_context_get_options( $stream );1205 1206 if ( empty( $context_options['ssl']['peer_certificate'] ) )1207 return false;1208 1209 $cert = openssl_x509_parse( $context_options['ssl']['peer_certificate'] );1210 if ( ! $cert )1211 return false;1212 1213 /*1214 * If the request is being made to an IP address, we'll validate against IP fields1215 * in the cert (if they exist)1216 */1217 $host_type = ( WP_HTTP::is_ip_address( $host ) ? 'ip' : 'dns' );1218 1219 $certificate_hostnames = array();1220 if ( ! empty( $cert['extensions']['subjectAltName'] ) ) {1221 $match_against = preg_split( '/,\s*/', $cert['extensions']['subjectAltName'] );1222 foreach ( $match_against as $match ) {1223 list( $match_type, $match_host ) = explode( ':', $match );1224 if ( $host_type == strtolower( trim( $match_type ) ) ) // IP: or DNS:1225 $certificate_hostnames[] = strtolower( trim( $match_host ) );1226 }1227 } elseif ( !empty( $cert['subject']['CN'] ) ) {1228 // Only use the CN when the certificate includes no subjectAltName extension.1229 $certificate_hostnames[] = strtolower( $cert['subject']['CN'] );1230 }1231 1232 // Exact hostname/IP matches.1233 if ( in_array( strtolower( $host ), $certificate_hostnames ) )1234 return true;1235 1236 // IP's can't be wildcards, Stop processing.1237 if ( 'ip' == $host_type )1238 return false;1239 1240 // Test to see if the domain is at least 2 deep for wildcard support.1241 if ( substr_count( $host, '.' ) < 2 )1242 return false;1243 1244 // Wildcard subdomains certs (*.example.com) are valid for a.example.com but not a.b.example.com.1245 $wildcard_host = preg_replace( '/^[^.]+\./', '*.', $host );1246 1247 return in_array( strtolower( $wildcard_host ), $certificate_hostnames );1248 }1249 1250 /**1251 * Whether this class can be used for retrieving a URL.1252 *1253 * @static1254 * @access public1255 * @since 2.7.01256 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().1257 *1258 * @return bool False means this class can not be used, true means it can.1259 */1260 public static function test( $args = array() ) {1261 if ( ! function_exists( 'stream_socket_client' ) )1262 return false;1263 1264 $is_ssl = isset( $args['ssl'] ) && $args['ssl'];1265 1266 if ( $is_ssl ) {1267 if ( ! extension_loaded( 'openssl' ) )1268 return false;1269 if ( ! function_exists( 'openssl_x509_parse' ) )1270 return false;1271 }1272 1273 /**1274 * Filter whether streams can be used as a transport for retrieving a URL.1275 *1276 * @since 2.7.01277 *1278 * @param bool $use_class Whether the class can be used. Default true.1279 * @param array $args Request arguments.1280 */1281 return apply_filters( 'use_streams_transport', true, $args );1282 }1283 }1284 1285 /**1286 * Deprecated HTTP Transport method which used fsockopen.1287 *1288 * This class is not used, and is included for backwards compatibility only.1289 * All code should make use of WP_HTTP directly through it's API.1290 *1291 * @see WP_HTTP::request1292 *1293 * @since 2.7.01294 * @deprecated 3.7.0 Please use WP_HTTP::request() directly1295 */1296 class WP_HTTP_Fsockopen extends WP_HTTP_Streams {1297 // For backwards compatibility for users who are using the class directly.1298 }1299 1300 /**1301 * HTTP request method uses Curl extension to retrieve the url.1302 *1303 * Requires the Curl extension to be installed.1304 *1305 * @package WordPress1306 * @subpackage HTTP1307 * @since 2.7.01308 */1309 class WP_Http_Curl {1310 1311 /**1312 * Temporary header storage for during requests.1313 *1314 * @since 3.2.01315 * @access private1316 * @var string1317 */1318 private $headers = '';1319 1320 /**1321 * Temporary body storage for during requests.1322 *1323 * @since 3.6.01324 * @access private1325 * @var string1326 */1327 private $body = '';1328 1329 /**1330 * The maximum amount of data to receive from the remote server.1331 *1332 * @since 3.6.01333 * @access private1334 * @var int1335 */1336 private $max_body_length = false;1337 1338 /**1339 * The file resource used for streaming to file.1340 *1341 * @since 3.6.01342 * @access private1343 * @var resource1344 */1345 private $stream_handle = false;1346 1347 /**1348 * The total bytes written in the current request.1349 *1350 * @since 4.1.01351 * @access private1352 * @var int1353 */1354 private $bytes_written_total = 0;1355 1356 /**1357 * Send a HTTP request to a URI using cURL extension.1358 *1359 * @access public1360 * @since 2.7.01361 *1362 * @param string $url The request URL.1363 * @param string|array $args Optional. Override the defaults.1364 * @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error1365 */1366 public function request($url, $args = array()) {1367 $defaults = array(1368 'method' => 'GET', 'timeout' => 5,1369 'redirection' => 5, 'httpversion' => '1.0',1370 'blocking' => true,1371 'headers' => array(), 'body' => null, 'cookies' => array()1372 );1373 1374 $r = wp_parse_args( $args, $defaults );1375 1376 if ( isset( $r['headers']['User-Agent'] ) ) {1377 $r['user-agent'] = $r['headers']['User-Agent'];1378 unset( $r['headers']['User-Agent'] );1379 } elseif ( isset( $r['headers']['user-agent'] ) ) {1380 $r['user-agent'] = $r['headers']['user-agent'];1381 unset( $r['headers']['user-agent'] );1382 }1383 1384 // Construct Cookie: header if any cookies are set.1385 WP_Http::buildCookieHeader( $r );1386 1387 $handle = curl_init();1388 1389 // cURL offers really easy proxy support.1390 $proxy = new WP_HTTP_Proxy();1391 1392 if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {1393 1394 curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP );1395 curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() );1396 curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() );1397 1398 if ( $proxy->use_authentication() ) {1399 curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY );1400 curl_setopt( $handle, CURLOPT_PROXYUSERPWD, $proxy->authentication() );1401 }1402 }1403 1404 $is_local = isset($r['local']) && $r['local'];1405 $ssl_verify = isset($r['sslverify']) && $r['sslverify'];1406 if ( $is_local ) {1407 /** This filter is documented in wp-includes/class-http.php */1408 $ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify );1409 } elseif ( ! $is_local ) {1410 /** This filter is documented in wp-includes/class-http.php */1411 $ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify );1412 }1413 1414 /*1415 * CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT expect integers. Have to use ceil since.1416 * a value of 0 will allow an unlimited timeout.1417 */1418 $timeout = (int) ceil( $r['timeout'] );1419 curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, $timeout );1420 curl_setopt( $handle, CURLOPT_TIMEOUT, $timeout );1421 1422 curl_setopt( $handle, CURLOPT_URL, $url);1423 curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true );1424 curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, ( $ssl_verify === true ) ? 2 : false );1425 curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, $ssl_verify );1426 curl_setopt( $handle, CURLOPT_CAINFO, $r['sslcertificates'] );1427 curl_setopt( $handle, CURLOPT_USERAGENT, $r['user-agent'] );1428 1429 /*1430 * The option doesn't work with safe mode or when open_basedir is set, and there's1431 * a bug #17490 with redirected POST requests, so handle redirections outside Curl.1432 */1433 curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false );1434 if ( defined( 'CURLOPT_PROTOCOLS' ) ) // PHP 5.2.10 / cURL 7.19.41435 curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );1436 1437 switch ( $r['method'] ) {1438 case 'HEAD':1439 curl_setopt( $handle, CURLOPT_NOBODY, true );1440 break;1441 case 'POST':1442 curl_setopt( $handle, CURLOPT_POST, true );1443 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );1444 break;1445 case 'PUT':1446 curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, 'PUT' );1447 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );1448 break;1449 default:1450 curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, $r['method'] );1451 if ( ! is_null( $r['body'] ) )1452 curl_setopt( $handle, CURLOPT_POSTFIELDS, $r['body'] );1453 break;1454 }1455 1456 if ( true === $r['blocking'] ) {1457 curl_setopt( $handle, CURLOPT_HEADERFUNCTION, array( $this, 'stream_headers' ) );1458 curl_setopt( $handle, CURLOPT_WRITEFUNCTION, array( $this, 'stream_body' ) );1459 }1460 1461 curl_setopt( $handle, CURLOPT_HEADER, false );1462 1463 if ( isset( $r['limit_response_size'] ) )1464 $this->max_body_length = intval( $r['limit_response_size'] );1465 else1466 $this->max_body_length = false;1467 1468 // If streaming to a file open a file handle, and setup our curl streaming handler.1469 if ( $r['stream'] ) {1470 if ( ! WP_DEBUG )1471 $this->stream_handle = @fopen( $r['filename'], 'w+' );1472 else1473 $this->stream_handle = fopen( $r['filename'], 'w+' );1474 if ( ! $this->stream_handle )1475 return new WP_Error( 'http_request_failed', sprintf( __( 'Could not open handle for fopen() to %s' ), $r['filename'] ) );1476 } else {1477 $this->stream_handle = false;1478 }1479 1480 if ( !empty( $r['headers'] ) ) {1481 // cURL expects full header strings in each element.1482 $headers = array();1483 foreach ( $r['headers'] as $name => $value ) {1484 $headers[] = "{$name}: $value";1485 }1486 curl_setopt( $handle, CURLOPT_HTTPHEADER, $headers );1487 }1488 1489 if ( $r['httpversion'] == '1.0' )1490 curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 );1491 else1492 curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 );1493 1494 /**1495 * Fires before the cURL request is executed.1496 *1497 * Cookies are not currently handled by the HTTP API. This action allows1498 * plugins to handle cookies themselves.1499 *1500 * @since 2.8.01501 *1502 * @param resource &$handle The cURL handle returned by curl_init().1503 * @param array $r The HTTP request arguments.1504 * @param string $url The request URL.1505 */1506 do_action_ref_array( 'http_api_curl', array( &$handle, $r, $url ) );1507 1508 // We don't need to return the body, so don't. Just execute request and return.1509 if ( ! $r['blocking'] ) {1510 curl_exec( $handle );1511 1512 if ( $curl_error = curl_error( $handle ) ) {1513 curl_close( $handle );1514 return new WP_Error( 'http_request_failed', $curl_error );1515 }1516 if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) {1517 curl_close( $handle );1518 return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );1519 }1520 1521 curl_close( $handle );1522 return array( 'headers' => array(), 'body' => '', 'response' => array('code' => false, 'message' => false), 'cookies' => array() );1523 }1524 1525 curl_exec( $handle );1526 $theHeaders = WP_Http::processHeaders( $this->headers, $url );1527 $theBody = $this->body;1528 $bytes_written_total = $this->bytes_written_total;1529 1530 $this->headers = '';1531 $this->body = '';1532 $this->bytes_written_total = 0;1533 1534 $curl_error = curl_errno( $handle );1535 1536 // If an error occurred, or, no response.1537 if ( $curl_error || ( 0 == strlen( $theBody ) && empty( $theHeaders['headers'] ) ) ) {1538 if ( CURLE_WRITE_ERROR /* 23 */ == $curl_error ) {1539 if ( ! $this->max_body_length || $this->max_body_length != $bytes_written_total ) {1540 if ( $r['stream'] ) {1541 curl_close( $handle );1542 fclose( $this->stream_handle );1543 return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );1544 } else {1545 curl_close( $handle );1546 return new WP_Error( 'http_request_failed', curl_error( $handle ) );1547 }1548 }1549 } else {1550 if ( $curl_error = curl_error( $handle ) ) {1551 curl_close( $handle );1552 return new WP_Error( 'http_request_failed', $curl_error );1553 }1554 }1555 if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ) ) ) {1556 curl_close( $handle );1557 return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );1558 }1559 }1560 1561 curl_close( $handle );1562 1563 if ( $r['stream'] )1564 fclose( $this->stream_handle );1565 1566 $response = array(1567 'headers' => $theHeaders['headers'],1568 'body' => null,1569 'response' => $theHeaders['response'],1570 'cookies' => $theHeaders['cookies'],1571 'filename' => $r['filename']1572 );1573 1574 // Handle redirects.1575 if ( false !== ( $redirect_response = WP_HTTP::handle_redirects( $url, $r, $response ) ) )1576 return $redirect_response;1577 1578 if ( true === $r['decompress'] && true === WP_Http_Encoding::should_decode($theHeaders['headers']) )1579 $theBody = WP_Http_Encoding::decompress( $theBody );1580 1581 $response['body'] = $theBody;1582 1583 return $response;1584 }1585 1586 /**1587 * Grab the headers of the cURL request1588 *1589 * Each header is sent individually to this callback, so we append to the $header property for temporary storage1590 *1591 * @since 3.2.01592 * @access private1593 * @return int1594 */1595 private function stream_headers( $handle, $headers ) {1596 $this->headers .= $headers;1597 return strlen( $headers );1598 }1599 1600 /**1601 * Grab the body of the cURL request1602 *1603 * The contents of the document are passed in chunks, so we append to the $body property for temporary storage.1604 * Returning a length shorter than the length of $data passed in will cause cURL to abort the request with CURLE_WRITE_ERROR1605 *1606 * @since 3.6.01607 * @access private1608 * @return int1609 */1610 private function stream_body( $handle, $data ) {1611 $data_length = strlen( $data );1612 1613 if ( $this->max_body_length && ( $this->bytes_written_total + $data_length ) > $this->max_body_length ) {1614 $data_length = ( $this->max_body_length - $this->bytes_written_total );1615 $data = substr( $data, 0, $data_length );1616 }1617 1618 if ( $this->stream_handle ) {1619 $bytes_written = fwrite( $this->stream_handle, $data );1620 } else {1621 $this->body .= $data;1622 $bytes_written = $data_length;1623 }1624 1625 $this->bytes_written_total += $bytes_written;1626 1627 // Upon event of this function returning less than strlen( $data ) curl will error with CURLE_WRITE_ERROR.1628 return $bytes_written;1629 }1630 1631 /**1632 * Whether this class can be used for retrieving an URL.1633 *1634 * @static1635 * @since 2.7.01636 *1637 * @return bool False means this class can not be used, true means it can.1638 */1639 public static function test( $args = array() ) {1640 if ( ! function_exists( 'curl_init' ) || ! function_exists( 'curl_exec' ) )1641 return false;1642 1643 $is_ssl = isset( $args['ssl'] ) && $args['ssl'];1644 1645 if ( $is_ssl ) {1646 $curl_version = curl_version();1647 // Check whether this cURL version support SSL requests.1648 if ( ! (CURL_VERSION_SSL & $curl_version['features']) )1649 return false;1650 }1651 1652 /**1653 * Filter whether cURL can be used as a transport for retrieving a URL.1654 *1655 * @since 2.7.01656 *1657 * @param bool $use_class Whether the class can be used. Default true.1658 * @param array $args An array of request arguments.1659 */1660 return apply_filters( 'use_curl_transport', true, $args );1661 }1662 }1663 1664 /**1665 * Adds Proxy support to the WordPress HTTP API.1666 *1667 * There are caveats to proxy support. It requires that defines be made in the wp-config.php file to1668 * enable proxy support. There are also a few filters that plugins can hook into for some of the1669 * constants.1670 *1671 * Please note that only BASIC authentication is supported by most transports.1672 * cURL MAY support more methods (such as NTLM authentication) depending on your environment.1673 *1674 * The constants are as follows:1675 * <ol>1676 * <li>WP_PROXY_HOST - Enable proxy support and host for connecting.</li>1677 * <li>WP_PROXY_PORT - Proxy port for connection. No default, must be defined.</li>1678 * <li>WP_PROXY_USERNAME - Proxy username, if it requires authentication.</li>1679 * <li>WP_PROXY_PASSWORD - Proxy password, if it requires authentication.</li>1680 * <li>WP_PROXY_BYPASS_HOSTS - Will prevent the hosts in this list from going through the proxy.1681 * You do not need to have localhost and the blog host in this list, because they will not be passed1682 * through the proxy. The list should be presented in a comma separated list, wildcards using * are supported, eg. *.wordpress.org</li>1683 * </ol>1684 *1685 * An example can be as seen below.1686 *1687 * define('WP_PROXY_HOST', '192.168.84.101');1688 * define('WP_PROXY_PORT', '8080');1689 * define('WP_PROXY_BYPASS_HOSTS', 'localhost, www.example.com, *.wordpress.org');1690 *1691 * @link https://core.trac.wordpress.org/ticket/4011 Proxy support ticket in WordPress.1692 * @link https://core.trac.wordpress.org/ticket/14636 Allow wildcard domains in WP_PROXY_BYPASS_HOSTS1693 * @since 2.8.01694 */1695 class WP_HTTP_Proxy {1696 1697 /**1698 * Whether proxy connection should be used.1699 *1700 * @since 2.8.01701 *1702 * @use WP_PROXY_HOST1703 * @use WP_PROXY_PORT1704 *1705 * @return bool1706 */1707 public function is_enabled() {1708 return defined('WP_PROXY_HOST') && defined('WP_PROXY_PORT');1709 }1710 1711 /**1712 * Whether authentication should be used.1713 *1714 * @since 2.8.01715 *1716 * @use WP_PROXY_USERNAME1717 * @use WP_PROXY_PASSWORD1718 *1719 * @return bool1720 */1721 public function use_authentication() {1722 return defined('WP_PROXY_USERNAME') && defined('WP_PROXY_PASSWORD');1723 }1724 1725 /**1726 * Retrieve the host for the proxy server.1727 *1728 * @since 2.8.01729 *1730 * @return string1731 */1732 public function host() {1733 if ( defined('WP_PROXY_HOST') )1734 return WP_PROXY_HOST;1735 1736 return '';1737 }1738 1739 /**1740 * Retrieve the port for the proxy server.1741 *1742 * @since 2.8.01743 *1744 * @return string1745 */1746 public function port() {1747 if ( defined('WP_PROXY_PORT') )1748 return WP_PROXY_PORT;1749 1750 return '';1751 }1752 1753 /**1754 * Retrieve the username for proxy authentication.1755 *1756 * @since 2.8.01757 *1758 * @return string1759 */1760 public function username() {1761 if ( defined('WP_PROXY_USERNAME') )1762 return WP_PROXY_USERNAME;1763 1764 return '';1765 }1766 1767 /**1768 * Retrieve the password for proxy authentication.1769 *1770 * @since 2.8.01771 *1772 * @return string1773 */1774 public function password() {1775 if ( defined('WP_PROXY_PASSWORD') )1776 return WP_PROXY_PASSWORD;1777 1778 return '';1779 }1780 1781 /**1782 * Retrieve authentication string for proxy authentication.1783 *1784 * @since 2.8.01785 *1786 * @return string1787 */1788 public function authentication() {1789 return $this->username() . ':' . $this->password();1790 }1791 1792 /**1793 * Retrieve header string for proxy authentication.1794 *1795 * @since 2.8.01796 *1797 * @return string1798 */1799 public function authentication_header() {1800 return 'Proxy-Authorization: Basic ' . base64_encode( $this->authentication() );1801 }1802 1803 /**1804 * Whether URL should be sent through the proxy server.1805 *1806 * We want to keep localhost and the blog URL from being sent through the proxy server, because1807 * some proxies can not handle this. We also have the constant available for defining other1808 * hosts that won't be sent through the proxy.1809 *1810 * @since 2.8.01811 *1812 * @staticvar array|null $bypass_hosts1813 * @staticvar array $wildcard_regex1814 *1815 * @param string $uri URI to check.1816 * @return bool True, to send through the proxy and false if, the proxy should not be used.1817 */1818 public function send_through_proxy( $uri ) {1819 /*1820 * parse_url() only handles http, https type URLs, and will emit E_WARNING on failure.1821 * This will be displayed on blogs, which is not reasonable.1822 */1823 $check = @parse_url($uri);1824 1825 // Malformed URL, can not process, but this could mean ssl, so let through anyway.1826 if ( $check === false )1827 return true;1828 1829 $home = parse_url( get_option('siteurl') );1830 1831 /**1832 * Filter whether to preempt sending the request through the proxy server.1833 *1834 * Returning false will bypass the proxy; returning true will send1835 * the request through the proxy. Returning null bypasses the filter.1836 *1837 * @since 3.5.01838 *1839 * @param null $override Whether to override the request result. Default null.1840 * @param string $uri URL to check.1841 * @param array $check Associative array result of parsing the URI.1842 * @param array $home Associative array result of parsing the site URL.1843 */1844 $result = apply_filters( 'pre_http_send_through_proxy', null, $uri, $check, $home );1845 if ( ! is_null( $result ) )1846 return $result;1847 1848 if ( 'localhost' == $check['host'] || ( isset( $home['host'] ) && $home['host'] == $check['host'] ) )1849 return false;1850 1851 if ( !defined('WP_PROXY_BYPASS_HOSTS') )1852 return true;1853 1854 static $bypass_hosts = null;1855 static $wildcard_regex = array();1856 if ( null === $bypass_hosts ) {1857 $bypass_hosts = preg_split('|,\s*|', WP_PROXY_BYPASS_HOSTS);1858 1859 if ( false !== strpos(WP_PROXY_BYPASS_HOSTS, '*') ) {1860 $wildcard_regex = array();1861 foreach ( $bypass_hosts as $host )1862 $wildcard_regex[] = str_replace( '\*', '.+', preg_quote( $host, '/' ) );1863 $wildcard_regex = '/^(' . implode('|', $wildcard_regex) . ')$/i';1864 }1865 }1866 1867 if ( !empty($wildcard_regex) )1868 return !preg_match($wildcard_regex, $check['host']);1869 else1870 return !in_array( $check['host'], $bypass_hosts );1871 }1872 }1873 2 /** 1874 3 * Internal representation of a single cookie. … … 2083 212 } 2084 213 } 2085 2086 /**2087 * Implementation for deflate and gzip transfer encodings.2088 *2089 * Includes RFC 1950, RFC 1951, and RFC 1952.2090 *2091 * @since 2.8.02092 * @package WordPress2093 * @subpackage HTTP2094 */2095 class WP_Http_Encoding {2096 2097 /**2098 * Compress raw string using the deflate format.2099 *2100 * Supports the RFC 1951 standard.2101 *2102 * @since 2.8.02103 *2104 * @static2105 *2106 * @param string $raw String to compress.2107 * @param int $level Optional, default is 9. Compression level, 9 is highest.2108 * @param string $supports Optional, not used. When implemented it will choose the right compression based on what the server supports.2109 * @return string|false False on failure.2110 */2111 public static function compress( $raw, $level = 9, $supports = null ) {2112 return gzdeflate( $raw, $level );2113 }2114 2115 /**2116 * Decompression of deflated string.2117 *2118 * Will attempt to decompress using the RFC 1950 standard, and if that fails2119 * then the RFC 1951 standard deflate will be attempted. Finally, the RFC2120 * 1952 standard gzip decode will be attempted. If all fail, then the2121 * original compressed string will be returned.2122 *2123 * @since 2.8.02124 *2125 * @static2126 *2127 * @param string $compressed String to decompress.2128 * @param int $length The optional length of the compressed data.2129 * @return string|bool False on failure.2130 */2131 public static function decompress( $compressed, $length = null ) {2132 2133 if ( empty($compressed) )2134 return $compressed;2135 2136 if ( false !== ( $decompressed = @gzinflate( $compressed ) ) )2137 return $decompressed;2138 2139 if ( false !== ( $decompressed = self::compatible_gzinflate( $compressed ) ) )2140 return $decompressed;2141 2142 if ( false !== ( $decompressed = @gzuncompress( $compressed ) ) )2143 return $decompressed;2144 2145 if ( function_exists('gzdecode') ) {2146 $decompressed = @gzdecode( $compressed );2147 2148 if ( false !== $decompressed )2149 return $decompressed;2150 }2151 2152 return $compressed;2153 }2154 2155 /**2156 * Decompression of deflated string while staying compatible with the majority of servers.2157 *2158 * Certain Servers will return deflated data with headers which PHP's gzinflate()2159 * function cannot handle out of the box. The following function has been created from2160 * various snippets on the gzinflate() PHP documentation.2161 *2162 * Warning: Magic numbers within. Due to the potential different formats that the compressed2163 * data may be returned in, some "magic offsets" are needed to ensure proper decompression2164 * takes place. For a simple progmatic way to determine the magic offset in use, see:2165 * https://core.trac.wordpress.org/ticket/182732166 *2167 * @since 2.8.12168 * @link https://core.trac.wordpress.org/ticket/182732169 * @link http://au2.php.net/manual/en/function.gzinflate.php#708752170 * @link http://au2.php.net/manual/en/function.gzinflate.php#773362171 *2172 * @static2173 *2174 * @param string $gzData String to decompress.2175 * @return string|bool False on failure.2176 */2177 public static function compatible_gzinflate($gzData) {2178 2179 // Compressed data might contain a full header, if so strip it for gzinflate().2180 if ( substr($gzData, 0, 3) == "\x1f\x8b\x08" ) {2181 $i = 10;2182 $flg = ord( substr($gzData, 3, 1) );2183 if ( $flg > 0 ) {2184 if ( $flg & 4 ) {2185 list($xlen) = unpack('v', substr($gzData, $i, 2) );2186 $i = $i + 2 + $xlen;2187 }2188 if ( $flg & 8 )2189 $i = strpos($gzData, "\0", $i) + 1;2190 if ( $flg & 16 )2191 $i = strpos($gzData, "\0", $i) + 1;2192 if ( $flg & 2 )2193 $i = $i + 2;2194 }2195 $decompressed = @gzinflate( substr($gzData, $i, -8) );2196 if ( false !== $decompressed )2197 return $decompressed;2198 }2199 2200 // Compressed data from java.util.zip.Deflater amongst others.2201 $decompressed = @gzinflate( substr($gzData, 2) );2202 if ( false !== $decompressed )2203 return $decompressed;2204 2205 return false;2206 }2207 2208 /**2209 * What encoding types to accept and their priority values.2210 *2211 * @since 2.8.02212 *2213 * @static2214 *2215 * @param string $url2216 * @param array $args2217 * @return string Types of encoding to accept.2218 */2219 public static function accept_encoding( $url, $args ) {2220 $type = array();2221 $compression_enabled = self::is_available();2222 2223 if ( ! $args['decompress'] ) // Decompression specifically disabled.2224 $compression_enabled = false;2225 elseif ( $args['stream'] ) // Disable when streaming to file.2226 $compression_enabled = false;2227 elseif ( isset( $args['limit_response_size'] ) ) // If only partial content is being requested, we won't be able to decompress it.2228 $compression_enabled = false;2229 2230 if ( $compression_enabled ) {2231 if ( function_exists( 'gzinflate' ) )2232 $type[] = 'deflate;q=1.0';2233 2234 if ( function_exists( 'gzuncompress' ) )2235 $type[] = 'compress;q=0.5';2236 2237 if ( function_exists( 'gzdecode' ) )2238 $type[] = 'gzip;q=0.5';2239 }2240 2241 /**2242 * Filter the allowed encoding types.2243 *2244 * @since 3.6.02245 *2246 * @param array $type Encoding types allowed. Accepts 'gzinflate',2247 * 'gzuncompress', 'gzdecode'.2248 * @param string $url URL of the HTTP request.2249 * @param array $args HTTP request arguments.2250 */2251 $type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args );2252 2253 return implode(', ', $type);2254 }2255 2256 /**2257 * What encoding the content used when it was compressed to send in the headers.2258 *2259 * @since 2.8.02260 *2261 * @static2262 *2263 * @return string Content-Encoding string to send in the header.2264 */2265 public static function content_encoding() {2266 return 'deflate';2267 }2268 2269 /**2270 * Whether the content be decoded based on the headers.2271 *2272 * @since 2.8.02273 *2274 * @static2275 *2276 * @param array|string $headers All of the available headers.2277 * @return bool2278 */2279 public static function should_decode($headers) {2280 if ( is_array( $headers ) ) {2281 if ( array_key_exists('content-encoding', $headers) && ! empty( $headers['content-encoding'] ) )2282 return true;2283 } elseif ( is_string( $headers ) ) {2284 return ( stripos($headers, 'content-encoding:') !== false );2285 }2286 2287 return false;2288 }2289 2290 /**2291 * Whether decompression and compression are supported by the PHP version.2292 *2293 * Each function is tested instead of checking for the zlib extension, to2294 * ensure that the functions all exist in the PHP version and aren't2295 * disabled.2296 *2297 * @since 2.8.02298 *2299 * @static2300 *2301 * @return bool2302 */2303 public static function is_available() {2304 return ( function_exists('gzuncompress') || function_exists('gzdeflate') || function_exists('gzinflate') );2305 }2306 }
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