name : class-wp-rest-server.php <?php /** * REST API: WP_REST_Server class * * @package WordPress * @subpackage REST_API * @since 4.4.0 */ /** * Core class used to implement the WordPress REST API server. * * @since 4.4.0 */ class WP_REST_Server { /** * Alias for GET transport method. * * @since 4.4.0 * @var string */ const READABLE = 'GET'; /** * Alias for POST transport method. * * @since 4.4.0 * @var string */ const CREATABLE = 'POST'; /** * Alias for POST, PUT, PATCH transport methods together. * * @since 4.4.0 * @var string */ const EDITABLE = 'POST, PUT, PATCH'; /** * Alias for DELETE transport method. * * @since 4.4.0 * @var string */ const DELETABLE = 'DELETE'; /** * Alias for GET, POST, PUT, PATCH & DELETE transport methods together. * * @since 4.4.0 * @var string */ const ALLMETHODS = 'GET, POST, PUT, PATCH, DELETE'; /** * Namespaces registered to the server. * * @since 4.4.0 * @var array */ protected $namespaces = array(); /** * Endpoints registered to the server. * * @since 4.4.0 * @var array */ protected $endpoints = array(); /** * Options defined for the routes. * * @since 4.4.0 * @var array */ protected $route_options = array(); /** * Instantiates the REST server. * * @since 4.4.0 */ public function __construct() { $this->endpoints = array( // Meta endpoints. '/' => array( 'callback' => array( $this, 'get_index' ), 'methods' => 'GET', 'args' => array( 'context' => array( 'default' => 'view', ), ), ), ); } /** * Checks the authentication headers if supplied. * * @since 4.4.0 * * @return WP_Error|null WP_Error indicates unsuccessful login, null indicates successful * or no authentication provided */ public function check_authentication() { /** * Filters REST authentication errors. * * This is used to pass a WP_Error from an authentication method back to * the API. * * Authentication methods should check first if they're being used, as * multiple authentication methods can be enabled on a site (cookies, * HTTP basic auth, OAuth). If the authentication method hooked in is * not actually being attempted, null should be returned to indicate * another authentication method should check instead. Similarly, * callbacks should ensure the value is `null` before checking for * errors. * * A WP_Error instance can be returned if an error occurs, and this should * match the format used by API methods internally (that is, the `status` * data should be used). A callback can return `true` to indicate that * the authentication method was used, and it succeeded. * * @since 4.4.0 * * @param WP_Error|null|bool WP_Error if authentication error, null if authentication * method wasn't used, true if authentication succeeded. */ return apply_filters( 'rest_authentication_errors', null ); } /** * Converts an error to a response object. * * This iterates over all error codes and messages to change it into a flat * array. This enables simpler client behaviour, as it is represented as a * list in JSON rather than an object/map. * * @since 4.4.0 * * @param WP_Error $error WP_Error instance. * @return WP_REST_Response List of associative arrays with code and message keys. */ protected function error_to_response( $error ) { $error_data = $error->get_error_data(); if ( is_array( $error_data ) && isset( $error_data['status'] ) ) { $status = $error_data['status']; } else { $status = 500; } $errors = array(); foreach ( (array) $error->errors as $code => $messages ) { foreach ( (array) $messages as $message ) { $errors[] = array( 'code' => $code, 'message' => $message, 'data' => $error->get_error_data( $code ), ); } } $data = $errors[0]; if ( count( $errors ) > 1 ) { // Remove the primary error. array_shift( $errors ); $data['additional_errors'] = $errors; } $response = new WP_REST_Response( $data, $status ); return $response; } /** * Retrieves an appropriate error representation in JSON. * * Note: This should only be used in WP_REST_Server::serve_request(), as it * cannot handle WP_Error internally. All callbacks and other internal methods * should instead return a WP_Error with the data set to an array that includes * a 'status' key, with the value being the HTTP status to send. * * @since 4.4.0 * * @param string $code WP_Error-style code. * @param string $message Human-readable message. * @param int $status Optional. HTTP status code to send. Default null. * @return string JSON representation of the error */ protected function json_error( $code, $message, $status = null ) { if ( $status ) { $this->set_status( $status ); } $error = compact( 'code', 'message' ); return wp_json_encode( $error ); } /** * Handles serving an API request. * * Matches the current server URI to a route and runs the first matching * callback then outputs a JSON representation of the returned value. * * @since 4.4.0 * * @see WP_REST_Server::dispatch() * * @param string $path Optional. The request route. If not set, `$_SERVER['PATH_INFO']` will be used. * Default null. * @return false|null Null if not served and a HEAD request, false otherwise. */ public function serve_request( $path = null ) { $content_type = isset( $_GET['_jsonp'] ) ? 'application/javascript' : 'application/json'; $this->send_header( 'Content-Type', $content_type . '; charset=' . get_option( 'blog_charset' ) ); $this->send_header( 'X-Robots-Tag', 'noindex' ); $api_root = get_rest_url(); if ( ! empty( $api_root ) ) { $this->send_header( 'Link', '<' . esc_url_raw( $api_root ) . '>; rel="https://api.w.org/"' ); } /* * Mitigate possible JSONP Flash attacks. * * https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/ */ $this->send_header( 'X-Content-Type-Options', 'nosniff' ); $this->send_header( 'Access-Control-Expose-Headers', 'X-WP-Total, X-WP-TotalPages' ); $this->send_header( 'Access-Control-Allow-Headers', 'Authorization, Content-Type' ); /** * Filters whether the REST API is enabled. * * @since 4.4.0 * @deprecated 4.7.0 Use the rest_authentication_errors filter to restrict access to the API * * @param bool $rest_enabled Whether the REST API is enabled. Default true. */ apply_filters_deprecated( 'rest_enabled', array( true ), '4.7.0', 'rest_authentication_errors', __( 'The REST API can no longer be completely disabled, the rest_authentication_errors filter can be used to restrict access to the API, instead.' ) ); /** * Filters whether jsonp is enabled. * * @since 4.4.0 * * @param bool $jsonp_enabled Whether jsonp is enabled. Default true. */ $jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true ); $jsonp_callback = null; if ( isset( $_GET['_jsonp'] ) ) { if ( ! $jsonp_enabled ) { echo $this->json_error( 'rest_callback_disabled', __( 'JSONP support is disabled on this site.' ), 400 ); return false; } $jsonp_callback = $_GET['_jsonp']; if ( ! wp_check_jsonp_callback( $jsonp_callback ) ) { echo $this->json_error( 'rest_callback_invalid', __( 'Invalid JSONP callback function.' ), 400 ); return false; } } if ( empty( $path ) ) { if ( isset( $_SERVER['PATH_INFO'] ) ) { $path = $_SERVER['PATH_INFO']; } else { $path = '/'; } } $request = new WP_REST_Request( $_SERVER['REQUEST_METHOD'], $path ); $request->set_query_params( wp_unslash( $_GET ) ); $request->set_body_params( wp_unslash( $_POST ) ); $request->set_file_params( $_FILES ); $request->set_headers( $this->get_headers( wp_unslash( $_SERVER ) ) ); $request->set_body( $this->get_raw_data() ); /* * HTTP method override for clients that can't use PUT/PATCH/DELETE. First, we check * $_GET['_method']. If that is not set, we check for the HTTP_X_HTTP_METHOD_OVERRIDE * header. */ $method_overridden = false; if ( isset( $_GET['_method'] ) ) { $request->set_method( $_GET['_method'] ); } elseif ( isset( $_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'] ) ) { $request->set_method( $_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'] ); $method_overridden = true; } $result = $this->check_authentication(); if ( ! is_wp_error( $result ) ) { $result = $this->dispatch( $request ); } // Normalize to either WP_Error or WP_REST_Response... $result = rest_ensure_response( $result ); // ...then convert WP_Error across. if ( is_wp_error( $result ) ) { $result = $this->error_to_response( $result ); } /** * Filters the API response. * * Allows modification of the response before returning. * * @since 4.4.0 * @since 4.5.0 Applied to embedded responses. * * @param WP_HTTP_Response $result Result to send to the client. Usually a WP_REST_Response. * @param WP_REST_Server $this Server instance. * @param WP_REST_Request $request Request used to generate the response. */ $result = apply_filters( 'rest_post_dispatch', rest_ensure_response( $result ), $this, $request ); // Wrap the response in an envelope if asked for. if ( isset( $_GET['_envelope'] ) ) { $result = $this->envelope_response( $result, isset( $_GET['_embed'] ) ); } // Send extra data from response objects. $headers = $result->get_headers(); $this->send_headers( $headers ); $code = $result->get_status(); $this->set_status( $code ); /** * Filters whether the request has already been served. * * Allow sending the request manually - by returning true, the API result * will not be sent to the client. * * @since 4.4.0 * * @param bool $served Whether the request has already been served. * Default false. * @param WP_HTTP_Response $result Result to send to the client. Usually a WP_REST_Response. * @param WP_REST_Request $request Request used to generate the response. * @param WP_REST_Server $this Server instance. */ $served = apply_filters( 'rest_pre_serve_request', false, $result, $request, $this ); /** * Filters whether to send nocache headers on a REST API request. * * @since 4.4.0 * @since 6.x.x Moved the block to catch the filter added on rest_cookie_check_errors() from rest-api.php * * @param bool $rest_send_nocache_headers Whether to send no-cache headers. */ $send_no_cache_headers = apply_filters( 'rest_send_nocache_headers', is_user_logged_in() ); // send no cache headers if the $send_no_cache_headers is true // OR if the HTTP_X_HTTP_METHOD_OVERRIDE is used but resulted a 4xx response code. if ( $send_no_cache_headers || ( true === $method_overridden && strpos( $code, '4' ) === 0 ) ) { foreach ( wp_get_nocache_headers() as $header => $header_value ) { if ( empty( $header_value ) ) { $this->remove_header( $header ); } else { $this->send_header( $header, $header_value ); } } } if ( ! $served ) { if ( 'HEAD' === $request->get_method() ) { return null; } // Embed links inside the request. $result = $this->response_to_data( $result, isset( $_GET['_embed'] ) ); /** * Filters the API response. * * Allows modification of the response data after inserting * embedded data (if any) and before echoing the response data. * * @since 4.8.1 * * @param array $result Response data to send to the client. * @param WP_REST_Server $this Server instance. * @param WP_REST_Request $request Request used to generate the response. */ $result = apply_filters( 'rest_pre_echo_response', $result, $this, $request ); $result = wp_json_encode( $result ); $json_error_message = $this->get_json_last_error(); if ( $json_error_message ) { $json_error_obj = new WP_Error( 'rest_encode_error', $json_error_message, array( 'status' => 500 ) ); $result = $this->error_to_response( $json_error_obj ); $result = wp_json_encode( $result->data[0] ); } if ( $jsonp_callback ) { // Prepend '/**/' to mitigate possible JSONP Flash attacks. // https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/ echo '/**/' . $jsonp_callback . '(' . $result . ')'; } else { echo $result; } } return null; } /** * Converts a response to data to send. * * @since 4.4.0 * * @param WP_REST_Response $response Response object. * @param bool $embed Whether links should be embedded. * @return array { * Data with sub-requests embedded. * * @type array [$_links] Links. * @type array [$_embedded] Embeddeds. * } */ public function response_to_data( $response, $embed ) { $data = $response->get_data(); $links = $this->get_compact_response_links( $response ); if ( ! empty( $links ) ) { // Convert links to part of the data. $data['_links'] = $links; } if ( $embed ) { // Determine if this is a numeric array. if ( wp_is_numeric_array( $data ) ) { $data = array_map( array( $this, 'embed_links' ), $data ); } else { $data = $this->embed_links( $data ); } } return $data; } /** * Retrieves links from a response. * * Extracts the links from a response into a structured hash, suitable for * direct output. * * @since 4.4.0 * * @param WP_REST_Response $response Response to extract links from. * @return array Map of link relation to list of link hashes. */ public static function get_response_links( $response ) { $links = $response->get_links(); if ( empty( $links ) ) { return array(); } // Convert links to part of the data. $data = array(); foreach ( $links as $rel => $items ) { $data[ $rel ] = array(); foreach ( $items as $item ) { $attributes = $item['attributes']; $attributes['href'] = $item['href']; $data[ $rel ][] = $attributes; } } return $data; } /** * Retrieves the CURIEs (compact URIs) used for relations. * * Extracts the links from a response into a structured hash, suitable for * direct output. * * @since 4.5.0 * * @param WP_REST_Response $response Response to extract links from. * @return array Map of link relation to list of link hashes. */ public static function get_compact_response_links( $response ) { $links = self::get_response_links( $response ); if ( empty( $links ) ) { return array(); } $curies = $response->get_curies(); $used_curies = array(); foreach ( $links as $rel => $items ) { // Convert $rel URIs to their compact versions if they exist. foreach ( $curies as $curie ) { $href_prefix = substr( $curie['href'], 0, strpos( $curie['href'], '{rel}' ) ); if ( strpos( $rel, $href_prefix ) !== 0 ) { continue; } // Relation now changes from '$uri' to '$curie:$relation'. $rel_regex = str_replace( '\{rel\}', '(.+)', preg_quote( $curie['href'], '!' ) ); preg_match( '!' . $rel_regex . '!', $rel, $matches ); if ( $matches ) { $new_rel = $curie['name'] . ':' . $matches[1]; $used_curies[ $curie['name'] ] = $curie; $links[ $new_rel ] = $items; unset( $links[ $rel ] ); break; } } } // Push the curies onto the start of the links array. if ( $used_curies ) { $links['curies'] = array_values( $used_curies ); } return $links; } /** * Embeds the links from the data into the request. * * @since 4.4.0 * * @param array $data Data from the request. * @return array { * Data with sub-requests embedded. * * @type array [$_links] Links. * @type array [$_embedded] Embeddeds. * } */ protected function embed_links( $data ) { if ( empty( $data['_links'] ) ) { return $data; } $embedded = array(); foreach ( $data['_links'] as $rel => $links ) { // Ignore links to self, for obvious reasons. if ( 'self' === $rel ) { continue; } $embeds = array(); foreach ( $links as $item ) { // Determine if the link is embeddable. if ( empty( $item['embeddable'] ) ) { // Ensure we keep the same order. $embeds[] = array(); continue; } // Run through our internal routing and serve. $request = WP_REST_Request::from_url( $item['href'] ); if ( ! $request ) { $embeds[] = array(); continue; } // Embedded resources get passed context=embed. if ( empty( $request['context'] ) ) { $request['context'] = 'embed'; } $response = $this->dispatch( $request ); /** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */ $response = apply_filters( 'rest_post_dispatch', rest_ensure_response( $response ), $this, $request ); $embeds[] = $this->response_to_data( $response, false ); } // Determine if any real links were found. $has_links = count( array_filter( $embeds ) ); if ( $has_links ) { $embedded[ $rel ] = $embeds; } } if ( ! empty( $embedded ) ) { $data['_embedded'] = $embedded; } return $data; } /** * Wraps the response in an envelope. * * The enveloping technique is used to work around browser/client * compatibility issues. Essentially, it converts the full HTTP response to * data instead. * * @since 4.4.0 * * @param WP_REST_Response $response Response object. * @param bool $embed Whether links should be embedded. * @return WP_REST_Response New response with wrapped data */ public function envelope_response( $response, $embed ) { $envelope = array( 'body' => $this->response_to_data( $response, $embed ), 'status' => $response->get_status(), 'headers' => $response->get_headers(), ); /** * Filters the enveloped form of a response. * * @since 4.4.0 * * @param array $envelope Envelope data. * @param WP_REST_Response $response Original response data. */ $envelope = apply_filters( 'rest_envelope_response', $envelope, $response ); // Ensure it's still a response and return. return rest_ensure_response( $envelope ); } /** * Registers a route to the server. * * @since 4.4.0 * * @param string $namespace Namespace. * @param string $route The REST route. * @param array $route_args Route arguments. * @param bool $override Optional. Whether the route should be overridden if it already exists. * Default false. */ public function register_route( $namespace, $route, $route_args, $override = false ) { if ( ! isset( $this->namespaces[ $namespace ] ) ) { $this->namespaces[ $namespace ] = array(); $this->register_route( $namespace, '/' . $namespace, array( array( 'methods' => self::READABLE, 'callback' => array( $this, 'get_namespace_index' ), 'args' => array( 'namespace' => array( 'default' => $namespace, ), 'context' => array( 'default' => 'view', ), ), ), ) ); } // Associative to avoid double-registration. $this->namespaces[ $namespace ][ $route ] = true; $route_args['namespace'] = $namespace; if ( $override || empty( $this->endpoints[ $route ] ) ) { $this->endpoints[ $route ] = $route_args; } else { $this->endpoints[ $route ] = array_merge( $this->endpoints[ $route ], $route_args ); } } /** * Retrieves the route map. * * The route map is an associative array with path regexes as the keys. The * value is an indexed array with the callback function/method as the first * item, and a bitmask of HTTP methods as the second item (see the class * constants). * * Each route can be mapped to more than one callback by using an array of * the indexed arrays. This allows mapping e.g. GET requests to one callback * and POST requests to another. * * Note that the path regexes (array keys) must have @ escaped, as this is * used as the delimiter with preg_match() * * @since 4.4.0 * * @return array `'/path/regex' => array( $callback, $bitmask )` or * `'/path/regex' => array( array( $callback, $bitmask ), ...)`. */ public function get_routes() { /** * Filters the array of available endpoints. * * @since 4.4.0 * * @param array $endpoints The available endpoints. An array of matching regex patterns, each mapped * to an array of callbacks for the endpoint. These take the format * `'/path/regex' => array( $callback, $bitmask )` or * `'/path/regex' => array( array( $callback, $bitmask ). */ $endpoints = apply_filters( 'rest_endpoints', $this->endpoints ); // Normalise the endpoints. $defaults = array( 'methods' => '', 'accept_json' => false, 'accept_raw' => false, 'show_in_index' => true, 'args' => array(), ); foreach ( $endpoints as $route => &$handlers ) { if ( isset( $handlers['callback'] ) ) { // Single endpoint, add one deeper. $handlers = array( $handlers ); } if ( ! isset( $this->route_options[ $route ] ) ) { $this->route_options[ $route ] = array(); } foreach ( $handlers as $key => &$handler ) { if ( ! is_numeric( $key ) ) { // Route option, move it to the options. $this->route_options[ $route ][ $key ] = $handler; unset( $handlers[ $key ] ); continue; } $handler = wp_parse_args( $handler, $defaults ); // Allow comma-separated HTTP methods. if ( is_string( $handler['methods'] ) ) { $methods = explode( ',', $handler['methods'] ); } elseif ( is_array( $handler['methods'] ) ) { $methods = $handler['methods']; } else { $methods = array(); } $handler['methods'] = array(); foreach ( $methods as $method ) { $method = strtoupper( trim( $method ) ); $handler['methods'][ $method ] = true; } } } return $endpoints; } /** * Retrieves namespaces registered on the server. * * @since 4.4.0 * * @return array List of registered namespaces. */ public function get_namespaces() { return array_keys( $this->namespaces ); } /** * Retrieves specified options for a route. * * @since 4.4.0 * * @param string $route Route pattern to fetch options for. * @return array|null Data as an associative array if found, or null if not found. */ public function get_route_options( $route ) { if ( ! isset( $this->route_options[ $route ] ) ) { return null; } return $this->route_options[ $route ]; } /** * Matches the request to a callback and call it. * * @since 4.4.0 * * @param WP_REST_Request $request Request to attempt dispatching. * @return WP_REST_Response Response returned by the callback. */ public function dispatch( $request ) { /** * Filters the pre-calculated result of a REST dispatch request. * * Allow hijacking the request before dispatching by returning a non-empty. The returned value * will be used to serve the request instead. * * @since 4.4.0 * * @param mixed $result Response to replace the requested version with. Can be anything * a normal endpoint can return, or null to not hijack the request. * @param WP_REST_Server $this Server instance. * @param WP_REST_Request $request Request used to generate the response. */ $result = apply_filters( 'rest_pre_dispatch', null, $this, $request ); if ( ! empty( $result ) ) { return $result; } $method = $request->get_method(); $path = $request->get_route(); foreach ( $this->get_routes() as $route => $handlers ) { $match = preg_match( '@^' . $route . '$@i', $path, $matches ); if ( ! $match ) { continue; } $args = array(); foreach ( $matches as $param => $value ) { if ( ! is_int( $param ) ) { $args[ $param ] = $value; } } foreach ( $handlers as $handler ) { $callback = $handler['callback']; $response = null; // Fallback to GET method if no HEAD method is registered. $checked_method = $method; if ( 'HEAD' === $method && empty( $handler['methods']['HEAD'] ) ) { $checked_method = 'GET'; } if ( empty( $handler['methods'][ $checked_method ] ) ) { continue; } if ( ! is_callable( $callback ) ) { $response = new WP_Error( 'rest_invalid_handler', __( 'The handler for the route is invalid' ), array( 'status' => 500 ) ); } if ( ! is_wp_error( $response ) ) { // Remove the redundant preg_match argument. unset( $args[0] ); $request->set_url_params( $args ); $request->set_attributes( $handler ); $defaults = array(); foreach ( $handler['args'] as $arg => $options ) { if ( isset( $options['default'] ) ) { $defaults[ $arg ] = $options['default']; } } $request->set_default_params( $defaults ); $check_required = $request->has_valid_params(); if ( is_wp_error( $check_required ) ) { $response = $check_required; } else { $check_sanitized = $request->sanitize_params(); if ( is_wp_error( $check_sanitized ) ) { $response = $check_sanitized; } } } /** * Filters the response before executing any REST API callbacks. * * Allows plugins to perform additional validation after a * request is initialized and matched to a registered route, * but before it is executed. * * Note that this filter will not be called for requests that * fail to authenticate or match to a registered route. * * @since 4.7.0 * * @param WP_HTTP_Response|WP_Error $response Result to send to the client. Usually a WP_REST_Response or WP_Error. * @param array $handler Route handler used for the request. * @param WP_REST_Request $request Request used to generate the response. */ $response = apply_filters( 'rest_request_before_callbacks', $response, $handler, $request ); if ( ! is_wp_error( $response ) ) { // Check permission specified on the route. if ( ! empty( $handler['permission_callback'] ) ) { $permission = call_user_func( $handler['permission_callback'], $request ); if ( is_wp_error( $permission ) ) { $response = $permission; } elseif ( false === $permission || null === $permission ) { $response = new WP_Error( 'rest_forbidden', __( 'Sorry, you are not allowed to do that.' ), array( 'status' => rest_authorization_required_code() ) ); } } } if ( ! is_wp_error( $response ) ) { /** * Filters the REST dispatch request result. * * Allow plugins to override dispatching the request. * * @since 4.4.0 * @since 4.5.0 Added `$route` and `$handler` parameters. * * @param mixed $dispatch_result Dispatch result, will be used if not empty. * @param WP_REST_Request $request Request used to generate the response. * @param string $route Route matched for the request. * @param array $handler Route handler used for the request. */ $dispatch_result = apply_filters( 'rest_dispatch_request', null, $request, $route, $handler ); // Allow plugins to halt the request via this filter. if ( null !== $dispatch_result ) { $response = $dispatch_result; } else { $response = call_user_func( $callback, $request ); } } /** * Filters the response immediately after executing any REST API * callbacks. * * Allows plugins to perform any needed cleanup, for example, * to undo changes made during the {@see 'rest_request_before_callbacks'} * filter. * * Note that this filter will not be called for requests that * fail to authenticate or match to a registered route. * * Note that an endpoint's `permission_callback` can still be * called after this filter - see `rest_send_allow_header()`. * * @since 4.7.0 * * @param WP_HTTP_Response|WP_Error $response Result to send to the client. Usually a WP_REST_Response or WP_Error. * @param array $handler Route handler used for the request. * @param WP_REST_Request $request Request used to generate the response. */ $response = apply_filters( 'rest_request_after_callbacks', $response, $handler, $request ); if ( is_wp_error( $response ) ) { $response = $this->error_to_response( $response ); } else { $response = rest_ensure_response( $response ); } $response->set_matched_route( $route ); $response->set_matched_handler( $handler ); return $response; } } return $this->error_to_response( new WP_Error( 'rest_no_route', __( 'No route was found matching the URL and request method' ), array( 'status' => 404 ) ) ); } /** * Returns if an error occurred during most recent JSON encode/decode. * * Strings to be translated will be in format like * "Encoding error: Maximum stack depth exceeded". * * @since 4.4.0 * * @return bool|string Boolean false or string error message. */ protected function get_json_last_error() { // See https://core.trac.wordpress.org/ticket/27799. if ( ! function_exists( 'json_last_error' ) ) { return false; } $last_error_code = json_last_error(); if ( ( defined( 'JSON_ERROR_NONE' ) && JSON_ERROR_NONE === $last_error_code ) || empty( $last_error_code ) ) { return false; } return json_last_error_msg(); } /** * Retrieves the site index. * * This endpoint describes the capabilities of the site. * * @since 4.4.0 * * @param array $request { * Request. * * @type string $context Context. * } * @return array Index entity */ public function get_index( $request ) { // General site data. $available = array( 'name' => get_option( 'blogname' ), 'description' => get_option( 'blogdescription' ), 'url' => get_option( 'siteurl' ), 'home' => home_url(), 'gmt_offset' => get_option( 'gmt_offset' ), 'timezone_string' => get_option( 'timezone_string' ), 'namespaces' => array_keys( $this->namespaces ), 'authentication' => array(), 'routes' => $this->get_data_for_routes( $this->get_routes(), $request['context'] ), ); $response = new WP_REST_Response( $available ); $response->add_link( 'help', 'http://v2.wp-api.org/' ); /** * Filters the API root index data. * * This contains the data describing the API. This includes information * about supported authentication schemes, supported namespaces, routes * available on the API, and a small amount of data about the site. * * @since 4.4.0 * * @param WP_REST_Response $response Response data. */ return apply_filters( 'rest_index', $response ); } /** * Retrieves the index for a namespace. * * @since 4.4.0 * * @param WP_REST_Request $request REST request instance. * @return WP_REST_Response|WP_Error WP_REST_Response instance if the index was found, * WP_Error if the namespace isn't set. */ public function get_namespace_index( $request ) { $namespace = $request['namespace']; if ( ! isset( $this->namespaces[ $namespace ] ) ) { return new WP_Error( 'rest_invalid_namespace', __( 'The specified namespace could not be found.' ), array( 'status' => 404 ) ); } $routes = $this->namespaces[ $namespace ]; $endpoints = array_intersect_key( $this->get_routes(), $routes ); $data = array( 'namespace' => $namespace, 'routes' => $this->get_data_for_routes( $endpoints, $request['context'] ), ); $response = rest_ensure_response( $data ); // Link to the root index. $response->add_link( 'up', rest_url( '/' ) ); /** * Filters the namespace index data. * * This typically is just the route data for the namespace, but you can * add any data you'd like here. * * @since 4.4.0 * * @param WP_REST_Response $response Response data. * @param WP_REST_Request $request Request data. The namespace is passed as the 'namespace' parameter. */ return apply_filters( 'rest_namespace_index', $response, $request ); } /** * Retrieves the publicly-visible data for routes. * * @since 4.4.0 * * @param array $routes Routes to get data for. * @param string $context Optional. Context for data. Accepts 'view' or 'help'. Default 'view'. * @return array Route data to expose in indexes. */ public function get_data_for_routes( $routes, $context = 'view' ) { $available = array(); // Find the available routes. foreach ( $routes as $route => $callbacks ) { $data = $this->get_data_for_route( $route, $callbacks, $context ); if ( empty( $data ) ) { continue; } /** * Filters the REST endpoint data. * * @since 4.4.0 * * @param WP_REST_Request $request Request data. The namespace is passed as the 'namespace' parameter. */ $available[ $route ] = apply_filters( 'rest_endpoints_description', $data ); } /** * Filters the publicly-visible data for routes. * * This data is exposed on indexes and can be used by clients or * developers to investigate the site and find out how to use it. It * acts as a form of self-documentation. * * @since 4.4.0 * * @param array $available Map of route to route data. * @param array $routes Internal route data as an associative array. */ return apply_filters( 'rest_route_data', $available, $routes ); } /** * Retrieves publicly-visible data for the route. * * @since 4.4.0 * * @param string $route Route to get data for. * @param array $callbacks Callbacks to convert to data. * @param string $context Optional. Context for the data. Accepts 'view' or 'help'. Default 'view'. * @return array|null Data for the route, or null if no publicly-visible data. */ public function get_data_for_route( $route, $callbacks, $context = 'view' ) { $data = array( 'namespace' => '', 'methods' => array(), 'endpoints' => array(), ); if ( isset( $this->route_options[ $route ] ) ) { $options = $this->route_options[ $route ]; if ( isset( $options['namespace'] ) ) { $data['namespace'] = $options['namespace']; } if ( isset( $options['schema'] ) && 'help' === $context ) { $data['schema'] = call_user_func( $options['schema'] ); } } $route = preg_replace( '#\(\?P<(\w+?)>.*?\)#', '{$1}', $route ); foreach ( $callbacks as $callback ) { // Skip to the next route if any callback is hidden. if ( empty( $callback['show_in_index'] ) ) { continue; } $data['methods'] = array_merge( $data['methods'], array_keys( $callback['methods'] ) ); $endpoint_data = array( 'methods' => array_keys( $callback['methods'] ), ); if ( isset( $callback['args'] ) ) { $endpoint_data['args'] = array(); foreach ( $callback['args'] as $key => $opts ) { $arg_data = array( 'required' => ! empty( $opts['required'] ), ); if ( isset( $opts['default'] ) ) { $arg_data['default'] = $opts['default']; } if ( isset( $opts['enum'] ) ) { $arg_data['enum'] = $opts['enum']; } if ( isset( $opts['description'] ) ) { $arg_data['description'] = $opts['description']; } if ( isset( $opts['type'] ) ) { $arg_data['type'] = $opts['type']; } if ( isset( $opts['items'] ) ) { $arg_data['items'] = $opts['items']; } $endpoint_data['args'][ $key ] = $arg_data; } } $data['endpoints'][] = $endpoint_data; // For non-variable routes, generate links. if ( strpos( $route, '{' ) === false ) { $data['_links'] = array( 'self' => rest_url( $route ), ); } } if ( empty( $data['methods'] ) ) { // No methods supported, hide the route. return null; } return $data; } /** * Sends an HTTP status code. * * @since 4.4.0 * * @param int $code HTTP status. */ protected function set_status( $code ) { status_header( $code ); } /** * Sends an HTTP header. * * @since 4.4.0 * * @param string $key Header key. * @param string $value Header value. */ public function send_header( $key, $value ) { /* * Sanitize as per RFC2616 (Section 4.2): * * Any LWS that occurs between field-content MAY be replaced with a * single SP before interpreting the field value or forwarding the * message downstream. */ $value = preg_replace( '/\s+/', ' ', $value ); header( sprintf( '%s: %s', $key, $value ) ); } /** * Sends multiple HTTP headers. * * @since 4.4.0 * * @param array $headers Map of header name to header value. */ public function send_headers( $headers ) { foreach ( $headers as $key => $value ) { $this->send_header( $key, $value ); } } /** * Removes an HTTP header from the current response. * * @since 4.8.0 * * @param string $key Header key. */ public function remove_header( $key ) { if ( function_exists( 'header_remove' ) ) { // In PHP 5.3+ there is a way to remove an already set header. header_remove( $key ); } else { // In PHP 5.2, send an empty header, but only as a last resort to // override a header already sent. foreach ( headers_list() as $header ) { if ( 0 === stripos( $header, "$key:" ) ) { $this->send_header( $key, '' ); break; } } } } /** * Retrieves the raw request entity (body). * * @since 4.4.0 * * @global string $HTTP_RAW_POST_DATA Raw post data. * * @return string Raw request data. */ public static function get_raw_data() { global $HTTP_RAW_POST_DATA; /* * A bug in PHP < 5.2.2 makes $HTTP_RAW_POST_DATA not set by default, * but we can do it ourself. */ if ( ! isset( $HTTP_RAW_POST_DATA ) ) { $HTTP_RAW_POST_DATA = file_get_contents( 'php://input' ); } return $HTTP_RAW_POST_DATA; } /** * Extracts headers from a PHP-style $_SERVER array. * * @since 4.4.0 * * @param array $server Associative array similar to `$_SERVER`. * @return array Headers extracted from the input. */ public function get_headers( $server ) { $headers = array(); // CONTENT_* headers are not prefixed with HTTP_. $additional = array( 'CONTENT_LENGTH' => true, 'CONTENT_MD5' => true, 'CONTENT_TYPE' => true, ); foreach ( $server as $key => $value ) { if ( strpos( $key, 'HTTP_' ) === 0 ) { $headers[ substr( $key, 5 ) ] = $value; } elseif ( isset( $additional[ $key ] ) ) { $headers[ $key ] = $value; } } return $headers; } }