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The URL is validated to avoid redirection and request forgery attacks. * * @since 3.6.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * * @param string $url Site URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * @return WP_Error|array The response or WP_Error on failure. */ function wp_safe_remote_get( $url, $args = array() ) { $args['reject_unsafe_urls'] = true; $http = _wp_http_get_object(); return $http->get( $url, $args ); } /** * Retrieve 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 is validated to avoid redirection and request forgery attacks. * * @since 3.6.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * * @param string $url Site URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * @return WP_Error|array The response or WP_Error on failure. */ function wp_safe_remote_post( $url, $args = array() ) { $args['reject_unsafe_urls'] = true; $http = _wp_http_get_object(); return $http->post( $url, $args ); } /** * Retrieve 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 is validated to avoid redirection and request forgery attacks. * * @since 3.6.0 * * @see wp_remote_request() For more information on the response array format. * @see WP_Http::request() For default arguments information. * * @param string $url Site URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * @return WP_Error|array The response or WP_Error on failure. */ function wp_safe_remote_head( $url, $args = array() ) { $args['reject_unsafe_urls'] = true; $http = _wp_http_get_object(); return $http->head( $url, $args ); } /** * Retrieve the raw response from the HTTP request. * * The array structure is a little complex: * * $res = array( * 'headers' => array(), * 'response' => array( * 'code' => int, * 'message' => string * ) * ); * * All of the headers in $res['headers'] are with the name as the key and the * value as the value. So to get the User-Agent, you would do the following. * * $user_agent = $res['headers']['user-agent']; * * The body is the raw response content and can be retrieved from $res['body']. * * This function is called first to make the request and there are other API * functions to abstract out the above convoluted setup. * * Request method defaults for helper functions: * - Default 'GET' for wp_remote_get() * - Default 'POST' for wp_remote_post() * - Default 'HEAD' for wp_remote_head() * * @since 2.7.0 * * @see WP_Http::request() For additional information on default arguments. * * @param string $url Site URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * @return WP_Error|array The response or WP_Error on failure. */ function wp_remote_request($url, $args = array()) { $http = _wp_http_get_object(); return $http->request( $url, $args ); } /** * Retrieve the raw response from the HTTP request using the GET method. * * @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 Site URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * @return WP_Error|array The response or WP_Error on failure. */ function wp_remote_get($url, $args = array()) { $http = _wp_http_get_object(); return $http->get( $url, $args ); } /** * Retrieve the raw response from the HTTP request using the POST method. * * @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 Site URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * @return WP_Error|array The response or WP_Error on failure. */ function wp_remote_post($url, $args = array()) { $http = _wp_http_get_object(); return $http->post( $url, $args ); } /** * Retrieve the raw response from the HTTP request using the HEAD method. * * @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 Site URL to retrieve. * @param array $args Optional. Request arguments. Default empty array. * @return WP_Error|array The response or WP_Error on failure. */ function wp_remote_head($url, $args = array()) { $http = _wp_http_get_object(); return $http->head( $url, $args ); } /** * Retrieve only the headers from the raw response. * * @since 2.7.0 * @since 4.6.0 Return value changed from an array to an Requests_Utility_CaseInsensitiveDictionary instance. * * @see \Requests_Utility_CaseInsensitiveDictionary * * @param array $response HTTP response. * @return array|\Requests_Utility_CaseInsensitiveDictionary The headers of the response. 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']; } /** * Retrieve a single header by name from the raw response. * * @since 2.7.0 * * @param array $response * @param string $header Header name to retrieve value from. * @return string The header value. Empty string on 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 ''; } if ( isset( $response['headers'][ $header ] ) ) { return $response['headers'][$header]; } return ''; } /** * Retrieve only the response code from the raw response. * * Will return an empty array if incorrect parameter value is given. * * @since 2.7.0 * * @param array $response HTTP response. * @return int|string The response code as an integer. Empty string on 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']; } /** * Retrieve only the response message from the raw response. * * Will return an empty array if incorrect parameter value is given. * * @since 2.7.0 * * @param array $response HTTP response. * @return string The response message. Empty string on 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']; } /** * Retrieve only the body from the raw response. * * @since 2.7.0 * * @param array $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']; } /** * Retrieve only the cookies from the raw response. * * @since 4.4.0 * * @param array $response HTTP response. * @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. */ function wp_remote_retrieve_cookies( $response ) { if ( is_wp_error( $response ) || empty( $response['cookies'] ) ) { return array(); } return $response['cookies']; } /** * Retrieve a single cookie by name from the raw response. * * @since 4.4.0 * * @param array $response HTTP response. * @param string $name The name of the cookie to retrieve. * @return WP_Http_Cookie|string The `WP_Http_Cookie` object. Empty string if the cookie isn't 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 ''; } /** * Retrieve a single cookie's value by name from the raw response. * * @since 4.4.0 * * @param array $response HTTP response. * @param string $name The name of the cookie to retrieve. * @return string The value of the cookie. Empty string if the cookie isn't present in the response. */ function wp_remote_retrieve_cookie_value( $response, $name ) { $cookie = wp_remote_retrieve_cookie( $response, $name ); if ( ! is_a( $cookie, '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 ) { $http = _wp_http_get_object(); $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 (bool) $http->_get_first_available_transport( $capabilities ); } /** * Get 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' ]; /** * Change the origin of an HTTP request. * * @since 3.4.0 * * @param string $origin The original origin for the request. */ return apply_filters( 'http_origin', $origin ); } /** * Retrieve list of allowed HTTP origins. * * @since 3.4.0 * * @return array 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' ], ) ); /** * Change the origin types allowed for HTTP requests. * * @since 3.4.0 * * @param array $allowed_origins { * Default allowed HTTP origins. * @type string Non-secure URL for admin origin. * @type string Secure URL for admin origin. * @type string Non-secure URL for home origin. * @type string Secure URL for home origin. * } */ return apply_filters( 'allowed_http_origins' , $allowed_origins ); } /** * Determines if the HTTP origin is an authorized one. * * @since 3.4.0 * * @param null|string $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() ) ) $origin = ''; /** * Change 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 ); } /** * Send 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; } /** * Validate a URL for safe use in the HTTP API. * * @since 3.5.2 * * @param string $url * @return false|string URL or false on failure. */ function wp_http_validate_url( $url ) { $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' ) ); if ( isset( $parsed_home['host'] ) ) { $same_host = strtolower( $parsed_home['host'] ) === strtolower( $parsed_url['host'] ); } else { $same_host = false; } if ( ! $same_host ) { $host = trim( $parsed_url['host'], '.' ); if ( preg_match( '#^(([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)\.){3}([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)$#', $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. /** * Check if HTTP request is external or not. * * Allows to change and allow external requests for the HTTP request. * * @since 3.6.0 * * @param bool false Whether HTTP request is external or not. * @param string $host IP of the requested host. * @param string $url URL of the requested host. */ if ( ! apply_filters( 'http_request_host_is_external', false, $host, $url ) ) return false; } } } if ( empty( $parsed_url['port'] ) ) return $url; $port = $parsed_url['port']; if ( 80 === $port || 443 === $port || 8080 === $port ) return $url; if ( $parsed_home && $same_host && isset( $parsed_home['port'] ) && $parsed_home['port'] === $port ) return $url; return false; } /** * Whitelists allowed redirect hosts for safe 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; } /** * Whitelists any domain in a multisite installation for safe HTTP requests. * * Attached to the {@see 'http_request_host_is_external'} filter. * * @since 3.6.0 * * @global wpdb $wpdb WordPress database abstraction object. * @staticvar array $queried * * @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 ( $host === get_network()->domain ) 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. * * PHP 5.4.7 expanded parse_url()'s ability to handle non-absolute url's, including * schemeless and relative url's with :// in the path. This function works around * those limitations providing a standard output on PHP 5.2~5.4+. * * Secondly, across various PHP versions, schemeless URLs starting containing a ":" * in the query are being handled inconsistently. This function works around those * differences as well. * * Error suppression is used as prior to PHP 5.3.3, an E_WARNING would be generated * when URL parsing failed. * * @since 4.4.0 * @since 4.7.0 The $component parameter was added for parity with PHP's parse_url(). * * @link https://secure.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. */ function wp_parse_url( $url, $component = -1 ) { $to_unset = array(); $url = strval( $url ); if ( '//' === substr( $url, 0, 2 ) ) { $to_unset[] = 'scheme'; $url = 'placeholder:' . $url; } elseif ( '/' === substr( $url, 0, 1 ) ) { $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 ); } /** * Retrieve a specific component from a parsed URL array. * * @internal * * @since 4.7.0 * @access private * * @link https://secure.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. */ 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; } } /** * Translate a PHP_URL_* constant to the named array keys PHP uses. * * @internal * * @since 4.7.0 * @access private * * @link https://secure.php.net/manual/en/url.constants.php * * @param int $constant PHP_URL_* constant. * @return string|bool The named key or 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; } }