3 * Core HTTP Request API
5 * Standardizes the HTTP requests for WordPress. Handles cookies, gzip encoding and decoding, chunk
6 * decoding, if HTTP 1.1 and various other difficult HTTP protocol implementations.
13 * Returns the initialized WP_Http Object
18 * @staticvar WP_Http $http
20 * @return WP_Http HTTP Transport object.
22 function _wp_http_get_object() {
25 if ( is_null( $http ) ) {
26 $http = new WP_Http();
32 * Retrieve the raw response from a safe HTTP request.
34 * This function is ideal when the HTTP request is being made to an arbitrary
35 * URL. The URL is validated to avoid redirection and request forgery attacks.
39 * @see wp_remote_request() For more information on the response array format.
40 * @see WP_Http::request() For default arguments information.
42 * @param string $url Site URL to retrieve.
43 * @param array $args Optional. Request arguments. Default empty array.
44 * @return WP_Error|array The response or WP_Error on failure.
46 function wp_safe_remote_request( $url, $args = array() ) {
47 $args['reject_unsafe_urls'] = true;
48 $http = _wp_http_get_object();
49 return $http->request( $url, $args );
53 * Retrieve the raw response from a safe HTTP request using the GET method.
55 * This function is ideal when the HTTP request is being made to an arbitrary
56 * URL. The URL is validated to avoid redirection and request forgery attacks.
60 * @see wp_remote_request() For more information on the response array format.
61 * @see WP_Http::request() For default arguments information.
63 * @param string $url Site URL to retrieve.
64 * @param array $args Optional. Request arguments. Default empty array.
65 * @return WP_Error|array The response or WP_Error on failure.
67 function wp_safe_remote_get( $url, $args = array() ) {
68 $args['reject_unsafe_urls'] = true;
69 $http = _wp_http_get_object();
70 return $http->get( $url, $args );
74 * Retrieve the raw response from a safe HTTP request using the POST method.
76 * This function is ideal when the HTTP request is being made to an arbitrary
77 * URL. The URL is validated to avoid redirection and request forgery attacks.
81 * @see wp_remote_request() For more information on the response array format.
82 * @see WP_Http::request() For default arguments information.
84 * @param string $url Site URL to retrieve.
85 * @param array $args Optional. Request arguments. Default empty array.
86 * @return WP_Error|array The response or WP_Error on failure.
88 function wp_safe_remote_post( $url, $args = array() ) {
89 $args['reject_unsafe_urls'] = true;
90 $http = _wp_http_get_object();
91 return $http->post( $url, $args );
95 * Retrieve the raw response from a safe HTTP request using the HEAD method.
97 * This function is ideal when the HTTP request is being made to an arbitrary
98 * URL. The URL is validated to avoid redirection and request forgery attacks.
102 * @see wp_remote_request() For more information on the response array format.
103 * @see WP_Http::request() For default arguments information.
105 * @param string $url Site URL to retrieve.
106 * @param array $args Optional. Request arguments. Default empty array.
107 * @return WP_Error|array The response or WP_Error on failure.
109 function wp_safe_remote_head( $url, $args = array() ) {
110 $args['reject_unsafe_urls'] = true;
111 $http = _wp_http_get_object();
112 return $http->head( $url, $args );
116 * Retrieve the raw response from the HTTP request.
118 * The array structure is a little complex:
121 * 'headers' => array(),
122 * 'response' => array(
124 * 'message' => string
128 * All of the headers in $res['headers'] are with the name as the key and the
129 * value as the value. So to get the User-Agent, you would do the following.
131 * $user_agent = $res['headers']['user-agent'];
133 * The body is the raw response content and can be retrieved from $res['body'].
135 * This function is called first to make the request and there are other API
136 * functions to abstract out the above convoluted setup.
138 * Request method defaults for helper functions:
139 * - Default 'GET' for wp_remote_get()
140 * - Default 'POST' for wp_remote_post()
141 * - Default 'HEAD' for wp_remote_head()
145 * @see WP_Http::request() For additional information on default arguments.
147 * @param string $url Site URL to retrieve.
148 * @param array $args Optional. Request arguments. Default empty array.
149 * @return WP_Error|array The response or WP_Error on failure.
151 function wp_remote_request($url, $args = array()) {
152 $http = _wp_http_get_object();
153 return $http->request( $url, $args );
157 * Retrieve the raw response from the HTTP request using the GET method.
161 * @see wp_remote_request() For more information on the response array format.
162 * @see WP_Http::request() For default arguments information.
164 * @param string $url Site URL to retrieve.
165 * @param array $args Optional. Request arguments. Default empty array.
166 * @return WP_Error|array The response or WP_Error on failure.
168 function wp_remote_get($url, $args = array()) {
169 $http = _wp_http_get_object();
170 return $http->get( $url, $args );
174 * Retrieve the raw response from the HTTP request using the POST method.
178 * @see wp_remote_request() For more information on the response array format.
179 * @see WP_Http::request() For default arguments information.
181 * @param string $url Site URL to retrieve.
182 * @param array $args Optional. Request arguments. Default empty array.
183 * @return WP_Error|array The response or WP_Error on failure.
185 function wp_remote_post($url, $args = array()) {
186 $http = _wp_http_get_object();
187 return $http->post( $url, $args );
191 * Retrieve the raw response from the HTTP request using the HEAD method.
195 * @see wp_remote_request() For more information on the response array format.
196 * @see WP_Http::request() For default arguments information.
198 * @param string $url Site URL to retrieve.
199 * @param array $args Optional. Request arguments. Default empty array.
200 * @return WP_Error|array The response or WP_Error on failure.
202 function wp_remote_head($url, $args = array()) {
203 $http = _wp_http_get_object();
204 return $http->head( $url, $args );
208 * Retrieve only the headers from the raw response.
212 * @param array $response HTTP response.
213 * @return array The headers of the response. Empty array if incorrect parameter given.
215 function wp_remote_retrieve_headers( $response ) {
216 if ( is_wp_error($response) || ! isset($response['headers']) || ! is_array($response['headers']))
219 return $response['headers'];
223 * Retrieve a single header by name from the raw response.
227 * @param array $response
228 * @param string $header Header name to retrieve value from.
229 * @return string The header value. Empty string on if incorrect parameter given, or if the header doesn't exist.
231 function wp_remote_retrieve_header( $response, $header ) {
232 if ( is_wp_error($response) || ! isset($response['headers']) || ! is_array($response['headers']))
235 if ( array_key_exists($header, $response['headers']) )
236 return $response['headers'][$header];
242 * Retrieve only the response code from the raw response.
244 * Will return an empty array if incorrect parameter value is given.
248 * @param array $response HTTP response.
249 * @return int|string The response code as an integer. Empty string on incorrect parameter given.
251 function wp_remote_retrieve_response_code( $response ) {
252 if ( is_wp_error($response) || ! isset($response['response']) || ! is_array($response['response']))
255 return $response['response']['code'];
259 * Retrieve only the response message from the raw response.
261 * Will return an empty array if incorrect parameter value is given.
265 * @param array $response HTTP response.
266 * @return string The response message. Empty string on incorrect parameter given.
268 function wp_remote_retrieve_response_message( $response ) {
269 if ( is_wp_error($response) || ! isset($response['response']) || ! is_array($response['response']))
272 return $response['response']['message'];
276 * Retrieve only the body from the raw response.
280 * @param array $response HTTP response.
281 * @return string The body of the response. Empty string if no body or incorrect parameter given.
283 function wp_remote_retrieve_body( $response ) {
284 if ( is_wp_error($response) || ! isset($response['body']) )
287 return $response['body'];
291 * Retrieve only the cookies from the raw response.
295 * @param array $response HTTP response.
296 * @return array An array of `WP_Http_Cookie` objects from the response. Empty array if there are none, or the response is a WP_Error.
298 function wp_remote_retrieve_cookies( $response ) {
299 if ( is_wp_error( $response ) || empty( $response['cookies'] ) ) {
303 return $response['cookies'];
307 * Retrieve a single cookie by name from the raw response.
311 * @param array $response HTTP response.
312 * @param string $name The name of the cookie to retrieve.
313 * @return WP_Http_Cookie|string The `WP_Http_Cookie` object. Empty string if the cookie isn't present in the response.
315 function wp_remote_retrieve_cookie( $response, $name ) {
316 $cookies = wp_remote_retrieve_cookies( $response );
318 if ( empty( $cookies ) ) {
322 foreach ( $cookies as $cookie ) {
323 if ( $cookie->name === $name ) {
332 * Retrieve a single cookie's value by name from the raw response.
336 * @param array $response HTTP response.
337 * @param string $name The name of the cookie to retrieve.
338 * @return string The value of the cookie. Empty string if the cookie isn't present in the response.
340 function wp_remote_retrieve_cookie_value( $response, $name ) {
341 $cookie = wp_remote_retrieve_cookie( $response, $name );
343 if ( ! is_a( $cookie, 'WP_Http_Cookie' ) ) {
347 return $cookie->value;
351 * Determines if there is an HTTP Transport that can process this request.
355 * @param array $capabilities Array of capabilities to test or a wp_remote_request() $args array.
356 * @param string $url Optional. If given, will check if the URL requires SSL and adds
357 * that requirement to the capabilities array.
361 function wp_http_supports( $capabilities = array(), $url = null ) {
362 $http = _wp_http_get_object();
364 $capabilities = wp_parse_args( $capabilities );
366 $count = count( $capabilities );
368 // If we have a numeric $capabilities array, spoof a wp_remote_request() associative $args array
369 if ( $count && count( array_filter( array_keys( $capabilities ), 'is_numeric' ) ) == $count ) {
370 $capabilities = array_combine( array_values( $capabilities ), array_fill( 0, $count, true ) );
373 if ( $url && !isset( $capabilities['ssl'] ) ) {
374 $scheme = parse_url( $url, PHP_URL_SCHEME );
375 if ( 'https' == $scheme || 'ssl' == $scheme ) {
376 $capabilities['ssl'] = true;
380 return (bool) $http->_get_first_available_transport( $capabilities );
384 * Get the HTTP Origin of the current request.
388 * @return string URL of the origin. Empty string if no origin.
390 function get_http_origin() {
392 if ( ! empty ( $_SERVER[ 'HTTP_ORIGIN' ] ) )
393 $origin = $_SERVER[ 'HTTP_ORIGIN' ];
396 * Change the origin of an HTTP request.
400 * @param string $origin The original origin for the request.
402 return apply_filters( 'http_origin', $origin );
406 * Retrieve list of allowed HTTP origins.
410 * @return array Array of origin URLs.
412 function get_allowed_http_origins() {
413 $admin_origin = parse_url( admin_url() );
414 $home_origin = parse_url( home_url() );
416 // @todo preserve port?
417 $allowed_origins = array_unique( array(
418 'http://' . $admin_origin[ 'host' ],
419 'https://' . $admin_origin[ 'host' ],
420 'http://' . $home_origin[ 'host' ],
421 'https://' . $home_origin[ 'host' ],
425 * Change the origin types allowed for HTTP requests.
429 * @param array $allowed_origins {
430 * Default allowed HTTP origins.
431 * @type string Non-secure URL for admin origin.
432 * @type string Secure URL for admin origin.
433 * @type string Non-secure URL for home origin.
434 * @type string Secure URL for home origin.
437 return apply_filters( 'allowed_http_origins' , $allowed_origins );
441 * Determines if the HTTP origin is an authorized one.
445 * @param null|string $origin Origin URL. If not provided, the value of get_http_origin() is used.
446 * @return string Origin URL if allowed, empty string if not.
448 function is_allowed_http_origin( $origin = null ) {
449 $origin_arg = $origin;
451 if ( null === $origin )
452 $origin = get_http_origin();
454 if ( $origin && ! in_array( $origin, get_allowed_http_origins() ) )
458 * Change the allowed HTTP origin result.
462 * @param string $origin Origin URL if allowed, empty string if not.
463 * @param string $origin_arg Original origin string passed into is_allowed_http_origin function.
465 return apply_filters( 'allowed_http_origin', $origin, $origin_arg );
469 * Send Access-Control-Allow-Origin and related headers if the current request
470 * is from an allowed origin.
472 * If the request is an OPTIONS request, the script exits with either access
473 * control headers sent, or a 403 response if the origin is not allowed. For
474 * other request methods, you will receive a return value.
478 * @return string|false Returns the origin URL if headers are sent. Returns false
479 * if headers are not sent.
481 function send_origin_headers() {
482 $origin = get_http_origin();
484 if ( is_allowed_http_origin( $origin ) ) {
485 @header( 'Access-Control-Allow-Origin: ' . $origin );
486 @header( 'Access-Control-Allow-Credentials: true' );
487 if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] )
492 if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] ) {
493 status_header( 403 );
501 * Validate a URL for safe use in the HTTP API.
506 * @return false|string URL or false on failure.
508 function wp_http_validate_url( $url ) {
509 $original_url = $url;
510 $url = wp_kses_bad_protocol( $url, array( 'http', 'https' ) );
511 if ( ! $url || strtolower( $url ) !== strtolower( $original_url ) )
514 $parsed_url = @parse_url( $url );
515 if ( ! $parsed_url || empty( $parsed_url['host'] ) )
518 if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
521 if ( false !== strpbrk( $parsed_url['host'], ':#?[]' ) )
524 $parsed_home = @parse_url( get_option( 'home' ) );
526 if ( isset( $parsed_home['host'] ) ) {
527 $same_host = ( strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] ) || 'localhost' === strtolower( $parsed_url['host'] ) );
532 if ( ! $same_host ) {
533 $host = trim( $parsed_url['host'], '.' );
534 if ( preg_match( '#^(([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)\.){3}([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)$#', $host ) ) {
537 $ip = gethostbyname( $host );
538 if ( $ip === $host ) // Error condition for gethostbyname()
542 $parts = array_map( 'intval', explode( '.', $ip ) );
543 if ( 127 === $parts[0] || 10 === $parts[0] || 0 === $parts[0]
544 || ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
545 || ( 192 === $parts[0] && 168 === $parts[1] )
547 // If host appears local, reject unless specifically allowed.
549 * Check if HTTP request is external or not.
551 * Allows to change and allow external requests for the HTTP request.
555 * @param bool false Whether HTTP request is external or not.
556 * @param string $host IP of the requested host.
557 * @param string $url URL of the requested host.
559 if ( ! apply_filters( 'http_request_host_is_external', false, $host, $url ) )
565 if ( empty( $parsed_url['port'] ) )
568 $port = $parsed_url['port'];
569 if ( 80 === $port || 443 === $port || 8080 === $port )
572 if ( $parsed_home && $same_host && isset( $parsed_home['port'] ) && $parsed_home['port'] === $port )
579 * Whitelists allowed redirect hosts for safe HTTP requests as well.
581 * Attached to the http_request_host_is_external filter.
585 * @param bool $is_external
586 * @param string $host
589 function allowed_http_request_hosts( $is_external, $host ) {
590 if ( ! $is_external && wp_validate_redirect( 'http://' . $host ) )
596 * Whitelists any domain in a multisite installation for safe HTTP requests.
598 * Attached to the http_request_host_is_external filter.
602 * @global wpdb $wpdb WordPress database abstraction object.
603 * @staticvar array $queried
605 * @param bool $is_external
606 * @param string $host
609 function ms_allowed_http_request_hosts( $is_external, $host ) {
611 static $queried = array();
614 if ( $host === get_current_site()->domain )
616 if ( isset( $queried[ $host ] ) )
617 return $queried[ $host ];
618 $queried[ $host ] = (bool) $wpdb->get_var( $wpdb->prepare( "SELECT domain FROM $wpdb->blogs WHERE domain = %s LIMIT 1", $host ) );
619 return $queried[ $host ];
623 * A wrapper for PHP's parse_url() function that handles edgecases in < PHP 5.4.7
625 * PHP 5.4.7 expanded parse_url()'s ability to handle non-absolute url's, including
626 * schemeless and relative url's with :// in the path, this works around those
627 * limitations providing a standard output on PHP 5.2~5.4+.
629 * Error suppression is used as prior to PHP 5.3.3, an E_WARNING would be generated
630 * when URL parsing failed.
634 * @param string $url The URL to parse.
635 * @return bool|array False on failure; Array of URL components on success;
636 * See parse_url()'s return values.
638 function wp_parse_url( $url ) {
639 $parts = @parse_url( $url );
641 // < PHP 5.4.7 compat, trouble with relative paths including a scheme break in the path
642 if ( '/' == $url[0] && false !== strpos( $url, '://' ) ) {
643 // Since we know it's a relative path, prefix with a scheme/host placeholder and try again
644 if ( ! $parts = @parse_url( 'placeholder://placeholder' . $url ) ) {
647 // Remove the placeholder values
648 unset( $parts['scheme'], $parts['host'] );
654 // < PHP 5.4.7 compat, doesn't detect schemeless URL's host field
655 if ( '//' == substr( $url, 0, 2 ) && ! isset( $parts['host'] ) ) {
656 $path_parts = explode( '/', substr( $parts['path'], 2 ), 2 );
657 $parts['host'] = $path_parts[0];
658 if ( isset( $path_parts[1] ) ) {
659 $parts['path'] = '/' . $path_parts[1];
661 unset( $parts['path'] );