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<?php /** * Core HTTP Request API * * Standardizes the HTTP requests for WordPress. Handles cookies, gzip encoding and decoding, chunk * decoding, if HTTP 1.1 and various other difficult HTTP protocol implementations. * * @package WordPress * @subpackage HTTP / /* * Returns the initialized WP_Http Object * * @since 2.7.0 * @access private * * @return WP_Http HTTP Transport object. / function _wp_http_get_object() { static $http = null; if ( is_null( $http ) ) { $http = new WP_Http(); } return $http; } /* * Retrieves the raw response from a safe HTTP request. * * This function is ideal when the HTTP request is being made to an arbitrary * URL. The URL, and every URL it redirects to, are validated with wp_http_validate_url() * to avoid Server Side Request Forgery attacks (SSRF). * * The only supported protocols are `http` and `https`. * * @since 3.6.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * @see wp_http_validate_url() For more information about how the URL is validated. * * @link https://owasp.org/www-community/attacks/Server_Side_Request_Forgery * * @param string $url URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * See WP_Http::request() for information on accepted arguments. * @return array\|WP_Error The response or WP_Error on failure. * See WP_Http::request() for information on return value. / function wp_safe_remote_request( $url, $args = array() ) { $args['reject_unsafe_urls'] = true; $http = _wp_http_get_object(); return $http->request( $url, $args ); } /* * Retrieves the raw response from a safe HTTP request using the GET method. * * This function is ideal when the HTTP request is being made to an arbitrary * URL. The URL, and every URL it redirects to, are validated with wp_http_validate_url() * to avoid Server Side Request Forgery attacks (SSRF). * * The only supported protocols are `http` and `https`. * * @since 3.6.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * @see wp_http_validate_url() For more information about how the URL is validated. * * @link https://owasp.org/www-community/attacks/Server_Side_Request_Forgery * * @param string $url URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * See WP_Http::request() for information on accepted arguments. * @return array\|WP_Error The response or WP_Error on failure. * See WP_Http::request() for information on return value. / function wp_safe_remote_get( $url, $args = array() ) { $args['reject_unsafe_urls'] = true; $http = _wp_http_get_object(); return $http->get( $url, $args ); } /* * Retrieves the raw response from a safe HTTP request using the POST method. * * This function is ideal when the HTTP request is being made to an arbitrary * URL. The URL, and every URL it redirects to, are validated with wp_http_validate_url() * to avoid Server Side Request Forgery attacks (SSRF). * * The only supported protocols are `http` and `https`. * * @since 3.6.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * @see wp_http_validate_url() For more information about how the URL is validated. * * @link https://owasp.org/www-community/attacks/Server_Side_Request_Forgery * * @param string $url URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * See WP_Http::request() for information on accepted arguments. * @return array\|WP_Error The response or WP_Error on failure. * See WP_Http::request() for information on return value. / function wp_safe_remote_post( $url, $args = array() ) { $args['reject_unsafe_urls'] = true; $http = _wp_http_get_object(); return $http->post( $url, $args ); } /* * Retrieves the raw response from a safe HTTP request using the HEAD method. * * This function is ideal when the HTTP request is being made to an arbitrary * URL. The URL, and every URL it redirects to, are validated with wp_http_validate_url() * to avoid Server Side Request Forgery attacks (SSRF). * * The only supported protocols are `http` and `https`. * * @since 3.6.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * @see wp_http_validate_url() For more information about how the URL is validated. * * @link https://owasp.org/www-community/attacks/Server_Side_Request_Forgery * * @param string $url URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * See WP_Http::request() for information on accepted arguments. * @return array\|WP_Error The response or WP_Error on failure. * See WP_Http::request() for information on return value. / function wp_safe_remote_head( $url, $args = array() ) { $args['reject_unsafe_urls'] = true; $http = _wp_http_get_object(); return $http->head( $url, $args ); } /* * Performs an HTTP request and returns its response. * * There are other API functions available which abstract away the HTTP method: * * - Default 'GET' for wp_remote_get() * - Default 'POST' for wp_remote_post() * - Default 'HEAD' for wp_remote_head() * * Important: If the URL is user-controlled, use `wp_safe_remote_request()` instead. * * @since 2.7.0 * * @see WP_Http::request() For information on default arguments. * * @param string $url URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * See WP_Http::request() for information on accepted arguments. * @return array\|WP_Error The response array or a WP_Error on failure. * See WP_Http::request() for information on return value. / function wp_remote_request( $url, $args = array() ) { $http = _wp_http_get_object(); return $http->request( $url, $args ); } /* * Performs an HTTP request using the GET method and returns its response. * * Important: If the URL is user-controlled, use `wp_safe_remote_get()` instead. * * @since 2.7.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * * @param string $url URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * See WP_Http::request() for information on accepted arguments. * @return array\|WP_Error The response or WP_Error on failure. * See WP_Http::request() for information on return value. / function wp_remote_get( $url, $args = array() ) { $http = _wp_http_get_object(); return $http->get( $url, $args ); } /* * Performs an HTTP request using the POST method and returns its response. * * Important: If the URL is user-controlled, use `wp_safe_remote_post()` instead. * * @since 2.7.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * * @param string $url URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * See WP_Http::request() for information on accepted arguments. * @return array\|WP_Error The response or WP_Error on failure. * See WP_Http::request() for information on return value. / function wp_remote_post( $url, $args = array() ) { $http = _wp_http_get_object(); return $http->post( $url, $args ); } /* * Performs an HTTP request using the HEAD method and returns its response. * * Important: If the URL is user-controlled, use `wp_safe_remote_head()` instead. * * @since 2.7.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * * @param string $url URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * See WP_Http::request() for information on accepted arguments. * @return array\|WP_Error The response or WP_Error on failure. * See WP_Http::request() for information on return value. / function wp_remote_head( $url, $args = array() ) { $http = _wp_http_get_object(); return $http->head( $url, $args ); } /* * Retrieves only the headers from the raw response. * * @since 2.7.0 * @since 4.6.0 Return value changed from an array to an WpOrg\Requests\Utility\CaseInsensitiveDictionary instance. * * @see \WpOrg\Requests\Utility\CaseInsensitiveDictionary * * @param array\|WP_Error $response HTTP response. * @return \WpOrg\Requests\Utility\CaseInsensitiveDictionary\|array The headers of the response, or empty array * if incorrect parameter given. / function wp_remote_retrieve_headers( $response ) { if ( is_wp_error( $response ) \|\| ! isset( $response['headers'] ) ) { return array(); } return $response['headers']; } /* * Retrieves a single header by name from the raw response. * * @since 2.7.0 * * @param array\|WP_Error $response HTTP response. * @param string $header Header name to retrieve value from. * @return array\|string The header(s) value(s). Array if multiple headers with the same name are retrieved. * Empty string if incorrect parameter given, or if the header doesn't exist. / function wp_remote_retrieve_header( $response, $header ) { if ( is_wp_error( $response ) \|\| ! isset( $response['headers'] ) ) { return ''; } return $response['headers'][ $header ] ?? ''; } /* * Retrieves only the response code from the raw response. * * Will return an empty string if incorrect parameter value is given. * * @since 2.7.0 * * @param array\|WP_Error $response HTTP response. * @return int\|string The response code as an integer. Empty string if incorrect parameter given. / function wp_remote_retrieve_response_code( $response ) { if ( is_wp_error( $response ) \|\| ! isset( $response['response'] ) \|\| ! is_array( $response['response'] ) ) { return ''; } return $response['response']['code']; } /* * Retrieves only the response message from the raw response. * * Will return an empty string if incorrect parameter value is given. * * @since 2.7.0 * * @param array\|WP_Error $response HTTP response. * @return string The response message. Empty string if incorrect parameter given. / function wp_remote_retrieve_response_message( $response ) { if ( is_wp_error( $response ) \|\| ! isset( $response['response'] ) \|\| ! is_array( $response['response'] ) ) { return ''; } return $response['response']['message']; } /* * Retrieves only the body from the raw response. * * @since 2.7.0 * * @param array\|WP_Error $response HTTP response. * @return string The body of the response. Empty string if no body or incorrect parameter given. / function wp_remote_retrieve_body( $response ) { if ( is_wp_error( $response ) \|\| ! isset( $response['body'] ) ) { return ''; } return $response['body']; } /* * Retrieves only the cookies from the raw response. * * @since 4.4.0 * * @param array\|WP_Error $response HTTP response. * @return WP_Http_Cookie[] An array of `WP_Http_Cookie` objects from the response. * Empty array if there are none, or the response is a WP_Error. / function wp_remote_retrieve_cookies( $response ) { if ( is_wp_error( $response ) \|\| empty( $response['cookies'] ) ) { return array(); } return $response['cookies']; } /* * Retrieves a single cookie by name from the raw response. * * @since 4.4.0 * * @param array\|WP_Error $response HTTP response. * @param string $name The name of the cookie to retrieve. * @return WP_Http_Cookie\|string The `WP_Http_Cookie` object, or empty string * if the cookie is not present in the response. / function wp_remote_retrieve_cookie( $response, $name ) { $cookies = wp_remote_retrieve_cookies( $response ); if ( empty( $cookies ) ) { return ''; } foreach ( $cookies as $cookie ) { if ( $cookie->name === $name ) { return $cookie; } } return ''; } /* * Retrieves a single cookie's value by name from the raw response. * * @since 4.4.0 * * @param array\|WP_Error $response HTTP response. * @param string $name The name of the cookie to retrieve. * @return string The value of the cookie, or empty string * if the cookie is not present in the response. / function wp_remote_retrieve_cookie_value( $response, $name ) { $cookie = wp_remote_retrieve_cookie( $response, $name ); if ( ! ( $cookie instanceof WP_Http_Cookie ) ) { return ''; } return $cookie->value; } /* * Determines if there is an HTTP Transport that can process this request. * * @since 3.2.0 * * @param array $capabilities Array of capabilities to test or a wp_remote_request() $args array. * @param string $url Optional. If given, will check if the URL requires SSL and adds * that requirement to the capabilities array. * * @return bool / function wp_http_supports( $capabilities = array(), $url = null ) { $capabilities = wp_parse_args( $capabilities ); $count = count( $capabilities ); // If we have a numeric $capabilities array, spoof a wp_remote_request() associative $args array. if ( $count && count( array_filter( array_keys( $capabilities ), 'is_numeric' ) ) === $count ) { $capabilities = array_combine( array_values( $capabilities ), array_fill( 0, $count, true ) ); } if ( $url && ! isset( $capabilities['ssl'] ) ) { $scheme = parse_url( $url, PHP_URL_SCHEME ); if ( 'https' === $scheme \|\| 'ssl' === $scheme ) { $capabilities['ssl'] = true; } } return WpOrg\Requests\Requests::has_capabilities( $capabilities ); } /* * Gets the HTTP Origin of the current request. * * @since 3.4.0 * * @return string URL of the origin. Empty string if no origin. / function get_http_origin() { $origin = ''; if ( ! empty( $_SERVER['HTTP_ORIGIN'] ) ) { $origin = $_SERVER['HTTP_ORIGIN']; } /* * Changes the origin of an HTTP request. * * @since 3.4.0 * * @param string $origin The HTTP origin for the request. / return apply_filters( 'http_origin', $origin ); } /* * Retrieves list of allowed HTTP origins. * * @since 3.4.0 * * @return string[] Array of origin URLs. / function get_allowed_http_origins() { $admin_origin = parse_url( admin_url() ); $home_origin = parse_url( home_url() ); // @todo Preserve port? $allowed_origins = array_unique( array( 'http://' . $admin_origin['host'], 'https://' . $admin_origin['host'], 'http://' . $home_origin['host'], 'https://' . $home_origin['host'], ) ); /* * Changes the origin types allowed for HTTP requests. * * @since 3.4.0 * * @param string[] $allowed_origins Array of allowed HTTP origins. / return apply_filters( 'allowed_http_origins', $allowed_origins ); } /* * Determines if the HTTP origin is an authorized one. * * @since 3.4.0 * * @param string\|null $origin Origin URL. If not provided, the value of get_http_origin() is used. * @return string Origin URL if allowed, empty string if not. / function is_allowed_http_origin( $origin = null ) { $origin_arg = $origin; if ( null === $origin ) { $origin = get_http_origin(); } if ( $origin && ! in_array( $origin, get_allowed_http_origins(), true ) ) { $origin = ''; } /* * Changes the allowed HTTP origin result. * * @since 3.4.0 * * @param string $origin Origin URL if allowed, empty string if not. * @param string $origin_arg Original origin string passed into is_allowed_http_origin function. / return apply_filters( 'allowed_http_origin', $origin, $origin_arg ); } /* * Sends Access-Control-Allow-Origin and related headers if the current request * is from an allowed origin. * * If the request is an OPTIONS request, the script exits with either access * control headers sent, or a 403 response if the origin is not allowed. For * other request methods, you will receive a return value. * * @since 3.4.0 * * @return string\|false Returns the origin URL if headers are sent. Returns false * if headers are not sent. / function send_origin_headers() { $origin = get_http_origin(); if ( is_allowed_http_origin( $origin ) ) { header( 'Access-Control-Allow-Origin: ' . $origin ); header( 'Access-Control-Allow-Credentials: true' ); if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] ) { exit; } return $origin; } if ( 'OPTIONS' === $_SERVER['REQUEST_METHOD'] ) { status_header( 403 ); exit; } return false; } /* * Validates a URL as safe for use in the HTTP API. * * The only supported protocols are `http` and `https`. * * Examples of URLs that are considered unsafe: * * - `ftp://example.com/caniload.php` - Invalid protocol - only http and https are allowed. * - `http:///example.com/caniload.php` - Malformed URL. * - `http://user:pass@example.com/caniload.php` - Login information. * - `http://example.invalid/caniload.php` - Invalid hostname, as the IP cannot be looked up in DNS. * * Examples of URLs that are considered unsafe by default but can be allowed with filters: * * - `http://192.168.0.1/caniload.php` - IP address from LAN network. * This can be changed with the {@see 'http_request_host_is_external'} filter. * - `http://198.143.164.252:81/caniload.php` - By default, only ports 80, 443, and 8080 are allowed. * This can be changed with the {@see 'http_allowed_safe_ports'} filter. * * @since 3.5.2 * * @param string $url Request URL. * @return string\|false Returns false if the URL is not safe, or the original URL if it is safe. / function wp_http_validate_url( $url ) { if ( ! is_string( $url ) \|\| '' === $url \|\| is_numeric( $url ) ) { return false; } $original_url = $url; $url = wp_kses_bad_protocol( $url, array( 'http', 'https' ) ); if ( ! $url \|\| strtolower( $url ) !== strtolower( $original_url ) ) { return false; } $parsed_url = parse_url( $url ); if ( ! $parsed_url \|\| empty( $parsed_url['host'] ) ) { return false; } if ( isset( $parsed_url['user'] ) \|\| isset( $parsed_url['pass'] ) ) { return false; } if ( false !== strpbrk( $parsed_url['host'], ':#?[]' ) ) { return false; } $parsed_home = parse_url( get_option( 'home' ) ); $same_host = isset( $parsed_home['host'] ) && strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] ); $host = trim( $parsed_url['host'], '.' ); if ( ! $same_host ) { if ( preg_match( '#^(([1-9]?\d\|1\d\d\|25[0-5]\|2[0-4]\d)\.){3}([1-9]?\d\|1\d\d\|25[0-5]\|2[0-4]\d)$#', $host ) ) { $ip = $host; } else { $ip = gethostbyname( $host ); if ( $ip === $host ) { // Error condition for gethostbyname(). return false; } } if ( $ip ) { $parts = array_map( 'intval', explode( '.', $ip ) ); if ( 127 === $parts[0] \|\| 10 === $parts[0] \|\| 0 === $parts[0] \|\| ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] ) \|\| ( 192 === $parts[0] && 168 === $parts[1] ) ) { // If host appears local, reject unless specifically allowed. /* * Checks if HTTP request is external or not. * * Allows to change and allow external requests for the HTTP request. * * @since 3.6.0 * * @param bool $external Whether HTTP request is external or not. * @param string $host Host name of the requested URL. * @param string $url Requested URL. / if ( ! apply_filters( 'http_request_host_is_external', false, $host, $url ) ) { return false; } } } } if ( empty( $parsed_url['port'] ) ) { return $url; } $port = $parsed_url['port']; /* * Controls the list of ports considered safe in HTTP API. * * Allows to change and allow external requests for the HTTP request. * * @since 5.9.0 * * @param int[] $allowed_ports Array of integers for valid ports. Default allowed ports * are 80, 443, and 8080. * @param string $host Host name of the requested URL. * @param string $url Requested URL. / $allowed_ports = apply_filters( 'http_allowed_safe_ports', array( 80, 443, 8080 ), $host, $url ); if ( is_array( $allowed_ports ) && in_array( $port, $allowed_ports, true ) ) { return $url; } if ( $parsed_home && $same_host && isset( $parsed_home['port'] ) && $parsed_home['port'] === $port ) { return $url; } return false; } /* * Marks allowed redirect hosts safe for HTTP requests as well. * * Attached to the {@see 'http_request_host_is_external'} filter. * * @since 3.6.0 * * @param bool $is_external * @param string $host * @return bool / function allowed_http_request_hosts( $is_external, $host ) { if ( ! $is_external && wp_validate_redirect( 'http://' . $host ) ) { $is_external = true; } return $is_external; } /* * Adds any domain in a multisite installation for safe HTTP requests to the * allowed list. * * Attached to the {@see 'http_request_host_is_external'} filter. * * @since 3.6.0 * * @global wpdb $wpdb WordPress database abstraction object. * * @param bool $is_external * @param string $host * @return bool / function ms_allowed_http_request_hosts( $is_external, $host ) { global $wpdb; static $queried = array(); if ( $is_external ) { return $is_external; } if ( get_network()->domain === $host ) { return true; } if ( isset( $queried[ $host ] ) ) { return $queried[ $host ]; } $queried[ $host ] = (bool) $wpdb->get_var( $wpdb->prepare( "SELECT domain FROM $wpdb->blogs WHERE domain = %s LIMIT 1", $host ) ); return $queried[ $host ]; } /* * A wrapper for PHP's parse_url() function that handles consistency in the return values * across PHP versions. * * Across various PHP versions, schemeless URLs containing a ":" in the query * are being handled inconsistently. This function works around those differences. * * @since 4.4.0 * @since 4.7.0 The `$component` parameter was added for parity with PHP's `parse_url()`. * * @link https://www.php.net/manual/en/function.parse-url.php * * @param string $url The URL to parse. * @param int $component The specific component to retrieve. Use one of the PHP * predefined constants to specify which one. * Defaults to -1 (= return all parts as an array). * @return mixed False on parse failure; Array of URL components on success; * When a specific component has been requested: null if the component * doesn't exist in the given URL; a string or - in the case of * PHP_URL_PORT - integer when it does. See parse_url()'s return values. * * @phpstan-param int<-1, 7> $component * @phpstan-return ( * $component is -1 * ? false\|array{ * scheme?: string, * host?: string, * port?: int<0, 65535>, * user?: string, * pass?: string, * path?: string, * query?: string, * fragment?: string, * } * : ( * $component is 2 * ? int<0, 65535>\|null * : string\|null * ) * ) / function wp_parse_url( $url, $component = -1 ) { $to_unset = array(); $url = (string) $url; if ( str_starts_with( $url, '//' ) ) { $to_unset[] = 'scheme'; $url = 'placeholder:' . $url; } elseif ( str_starts_with( $url, '/' ) ) { $to_unset[] = 'scheme'; $to_unset[] = 'host'; $url = 'placeholder://placeholder' . $url; } $parts = parse_url( $url ); if ( false === $parts ) { // Parsing failure. return $parts; } // Remove the placeholder values. foreach ( $to_unset as $key ) { unset( $parts[ $key ] ); } return _get_component_from_parsed_url_array( $parts, $component ); } /* * Retrieves a specific component from a parsed URL array. * * @internal * * @since 4.7.0 * @access private * * @link https://www.php.net/manual/en/function.parse-url.php * * @param array\|false $url_parts The parsed URL. Can be false if the URL failed to parse. * @param int $component The specific component to retrieve. Use one of the PHP * predefined constants to specify which one. * Defaults to -1 (= return all parts as an array). * @return mixed False on parse failure; Array of URL components on success; * When a specific component has been requested: null if the component * doesn't exist in the given URL; a string or - in the case of * PHP_URL_PORT - integer when it does. See parse_url()'s return values. * * @phpstan-param false\|array{ * scheme?: string, * host?: string, * port?: int<0, 65535>, * user?: string, * pass?: string, * path?: string, * query?: string, * fragment?: string, * } $url_parts * @phpstan-param int<-1, 7> $component * @phpstan-return ( * $component is -1 * ? false\|array{ * scheme?: string, * host?: string, * port?: int<0, 65535>, * user?: string, * pass?: string, * path?: string, * query?: string, * fragment?: string, * } * : ( * $component is 2 * ? int<0, 65535>\|null * : string\|null * ) * ) / function _get_component_from_parsed_url_array( $url_parts, $component = -1 ) { if ( -1 === $component ) { return $url_parts; } $key = _wp_translate_php_url_constant_to_key( $component ); if ( false !== $key && is_array( $url_parts ) && isset( $url_parts[ $key ] ) ) { return $url_parts[ $key ]; } else { return null; } } /* * Translates a PHP_URL_* constant to the named array keys PHP uses. * * @internal * * @since 4.7.0 * @access private * * @link https://www.php.net/manual/en/url.constants.php * * @param int $constant PHP_URL_* constant. * @return string\|false The named key or false. * * @phpstan-param int<-1, 7> $constant * @phpstan-return 'scheme'\|'host'\|'port'\|'user'\|'pass'\|'path'\|'query'\|'fragment'\|false */ function _wp_translate_php_url_constant_to_key( $constant ) { $translation = array( PHP_URL_SCHEME => 'scheme', PHP_URL_HOST => 'host', PHP_URL_PORT => 'port', PHP_URL_USER => 'user', PHP_URL_PASS => 'pass', PHP_URL_PATH => 'path', PHP_URL_QUERY => 'query', PHP_URL_FRAGMENT => 'fragment', ); if ( isset( $translation[ $constant ] ) ) { return $translation[ $constant ]; } else { return false; } }