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WordPress/wp-includes/class-http.php

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<?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 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.
*
* @access public
* @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', or 'PUT'.
* 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
*
* @param int $timeout_value Time in seconds until a request times out.
* Default 5.
*/
'timeout' => apply_filters( 'http_request_timeout', 5 ),
/**
* Filters the number of redirects allowed during an HTTP request.
*
* @since 2.7.0
*
* @param int $redirect_count Number of redirects allowed. Default 5.
*/
'redirection' => apply_filters( 'http_request_redirection_count', 5 ),
/**
* Filters the version of the HTTP protocol used in a request.
*
* @since 2.7.0
*
* @param string $version Version of HTTP used. Accepts '1.0' and '1.1'.
* Default '1.0'.
*/
'httpversion' => apply_filters( 'http_request_version', '1.0' ),
/**
* Filters the user agent value sent with an HTTP request.
*
* @since 2.7.0
*
* @param string $user_agent WordPress user agent string.
*/
'user-agent' => apply_filters( 'http_headers_useragent', 'WordPress/' . get_bloginfo( 'version' ) . '; ' . get_bloginfo( 'url' ) ),
/**
* Filters whether to pass URLs through wp_http_validate_url() in an HTTP request.
*
* @since 3.6.0
*
* @param bool $pass_url Whether to pass URLs through wp_http_validate_url().
* Default false.
*/
'reject_unsafe_urls' => apply_filters( 'http_request_reject_unsafe_urls', false ),
'blocking' => true,
'headers' => array(),
'cookies' => array(),
'body' => null,
'compress' => false,
'decompress' => true,
'sslverify' => true,
'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 Requests_Hooks(),
);
// Ensure redirects follow browser behaviour.
$options['hooks']->register( 'requests.before_redirect', array( get_class(), 'browser_redirect_compatibility' ) );
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
*
* @param bool $ssl_verify Whether to verify the SSL connection. Default true.
*/
$options['verify'] = apply_filters( 'https_ssl_verify', $options['verify'] );
// 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 $args 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
* @access public
* @static
*
* @param array $cookies List 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
* @access public
* @static
*
* @param string $location URL to redirect to.
* @param array $headers Headers for the redirect.
* @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;
}
}
/**
* Tests which transports are capable of supporting the request.
*
* @since 3.2.0
* @access public
*
* @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
*
* @static
* @access private
*
* @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 wp-includes/class-http.php */
do_action( 'http_api_debug', $response, 'response', $class, $args, $url );
if ( is_wp_error( $response ) )
return $response;
/**
* Filters the HTTP API response immediately before the response is returned.
*
* @since 2.9.0
*
* @param array $response HTTP response.
* @param array $args HTTP request arguments.
* @param string $url The request URL.
*/
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.
*
* @access public
* @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.
*
* @access public
* @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.
*
* @access public
* @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.
*
* @access public
* @static
* @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.
*
* @access public
* @static
* @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.
*
* @access public
* @version 2.8.0
* @static
*
* @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.
*
* @access public
* @since 2.7.0
* @static
*
* @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.wordpress.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.
*
* @access protected
* @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
*
* @static
* @access public
*
* @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
*
* @static
*
* @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
* @static
*
* @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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