balmet.com

class-wp-rest-server.php (50656B)

---

 <?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();
 
 	/**
 	 * Caches embedded requests.
 	 *
 	 * @since 5.4.0
 	 * @var array
 	 */
 	protected $embed_cache = 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',
 					),
 				),
 			),
 			'/batch/v1' => array(
 				'callback' => array( $this, 'serve_batch_request_v1' ),
 				'methods'  => 'POST',
 				'args'     => array(
 					'validation' => array(
 						'type'    => 'string',
 						'enum'    => array( 'require-all-validate', 'normal' ),
 						'default' => 'normal',
 					),
 					'requests'   => array(
 						'required' => true,
 						'type'     => 'array',
 						'maxItems' => $this->get_max_batch_size(),
 						'items'    => array(
 							'type'       => 'object',
 							'properties' => array(
 								'method'  => array(
 									'type'    => 'string',
 									'enum'    => array( 'POST', 'PUT', 'PATCH', 'DELETE' ),
 									'default' => 'POST',
 								),
 								'path'    => array(
 									'type'     => 'string',
 									'required' => true,
 								),
 								'body'    => array(
 									'type'                 => 'object',
 									'properties'           => array(),
 									'additionalProperties' => true,
 								),
 								'headers' => array(
 									'type'                 => 'object',
 									'properties'           => array(),
 									'additionalProperties' => array(
 										'type'  => array( 'string', 'array' ),
 										'items' => array(
 											'type' => 'string',
 										),
 									),
 								),
 							),
 						),
 					),
 				),
 			),
 		);
 	}
 
 
 	/**
 	 * 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 API 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|true $errors 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
 	 * @since 5.7.0 Converted to a wrapper of {@see rest_convert_error_to_response()}.
 	 *
 	 * @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 ) {
 		return rest_convert_error_to_response( $error );
 	}
 
 	/**
 	 * 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 a REST 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()
 	 *
 	 * @global WP_User $current_user The currently authenticated user.
 	 *
 	 * @param string $path Optional. The request route. If not set, `$_SERVER['PATH_INFO']` will be used.
 	 *                     Default null.
 	 * @return null|false Null if not served and a HEAD request, false otherwise.
 	 */
 	public function serve_request( $path = null ) {
 		/* @var WP_User|null $current_user */
 		global $current_user;
 
 		if ( $current_user instanceof WP_User && ! $current_user->exists() ) {
 			/*
 			 * If there is no current user authenticated via other means, clear
 			 * the cached lack of user, so that an authenticate check can set it
 			 * properly.
 			 *
 			 * This is done because for authentications such as Application
 			 * Passwords, we don't want it to be accepted unless the current HTTP
 			 * request is a REST API request, which can't always be identified early
 			 * enough in evaluation.
 			 */
 			$current_user = null;
 		}
 
 		/**
 		 * Filters whether JSONP is enabled for the REST API.
 		 *
 		 * @since 4.4.0
 		 *
 		 * @param bool $jsonp_enabled Whether JSONP is enabled. Default true.
 		 */
 		$jsonp_enabled = apply_filters( 'rest_jsonp_enabled', true );
 
 		$jsonp_callback = false;
 		if ( isset( $_GET['_jsonp'] ) ) {
 			$jsonp_callback = $_GET['_jsonp'];
 		}
 
 		$content_type = ( $jsonp_callback && $jsonp_enabled ) ? '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' );
 		$expose_headers = array( 'X-WP-Total', 'X-WP-TotalPages', 'Link' );
 
 		/**
 		 * Filters the list of response headers that are exposed to REST API CORS requests.
 		 *
 		 * @since 5.5.0
 		 *
 		 * @param string[] $expose_headers The list of response headers to expose.
 		 */
 		$expose_headers = apply_filters( 'rest_exposed_cors_headers', $expose_headers );
 
 		$this->send_header( 'Access-Control-Expose-Headers', implode( ', ', $expose_headers ) );
 
 		$allow_headers = array(
 			'Authorization',
 			'X-WP-Nonce',
 			'Content-Disposition',
 			'Content-MD5',
 			'Content-Type',
 		);
 
 		/**
 		 * Filters the list of request headers that are allowed for REST API CORS requests.
 		 *
 		 * The allowed headers are passed to the browser to specify which
 		 * headers can be passed to the REST API. By default, we allow the
 		 * Content-* headers needed to upload files to the media endpoints.
 		 * As well as the Authorization and Nonce headers for allowing authentication.
 		 *
 		 * @since 5.5.0
 		 *
 		 * @param string[] $allow_headers The list of request headers to allow.
 		 */
 		$allow_headers = apply_filters( 'rest_allowed_cors_headers', $allow_headers );
 
 		$this->send_header( 'Access-Control-Allow-Headers', implode( ', ', $allow_headers ) );
 
 		/**
 		 * Filters whether to send nocache headers on a REST API request.
 		 *
 		 * @since 4.4.0
 		 *
 		 * @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() );
 		if ( $send_no_cache_headers ) {
 			foreach ( wp_get_nocache_headers() as $header => $header_value ) {
 				if ( empty( $header_value ) ) {
 					$this->remove_header( $header );
 				} else {
 					$this->send_header( $header, $header_value );
 				}
 			}
 		}
 
 		/**
 		 * Filters whether the REST API is enabled.
 		 *
 		 * @since 4.4.0
 		 * @deprecated 4.7.0 Use the {@see 'rest_authentication_errors'} filter to
 		 *                   restrict access to the REST 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',
 			sprintf(
 				/* translators: %s: rest_authentication_errors */
 				__( 'The REST API can no longer be completely disabled, the %s filter can be used to restrict access to the API, instead.' ),
 				'rest_authentication_errors'
 			)
 		);
 
 		if ( $jsonp_callback ) {
 			if ( ! $jsonp_enabled ) {
 				echo $this->json_error( 'rest_callback_disabled', __( 'JSONP support is disabled on this site.' ), 400 );
 				return false;
 			}
 
 			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( self::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.
 		 */
 		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'] );
 		}
 
 		$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 REST 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   $server  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 REST API 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   $server  Server instance.
 		 */
 		$served = apply_filters( 'rest_pre_serve_request', false, $result, $request, $this );
 
 		if ( ! $served ) {
 			if ( 'HEAD' === $request->get_method() ) {
 				return null;
 			}
 
 			// Embed links inside the request.
 			$embed  = isset( $_GET['_embed'] ) ? rest_parse_embed_param( $_GET['_embed'] ) : false;
 			$result = $this->response_to_data( $result, $embed );
 
 			/**
 			 * Filters the REST 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   $server  Server instance.
 			 * @param WP_REST_Request  $request Request used to generate the response.
 			 */
 			$result = apply_filters( 'rest_pre_echo_response', $result, $this, $request );
 
 			// The 204 response shouldn't have a body.
 			if ( 204 === $code || null === $result ) {
 				return null;
 			}
 
 			$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 );
 			}
 
 			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
 	 * @since 5.4.0 The $embed parameter can now contain a list of link relations to include.
 	 *
 	 * @param WP_REST_Response $response Response object.
 	 * @param bool|string[]    $embed    Whether to embed all links, a filtered list of link relations, or no links.
 	 * @return array {
 	 *     Data with sub-requests embedded.
 	 *
 	 *     @type array $_links    Links.
 	 *     @type array $_embedded Embedded objects.
 	 * }
 	 */
 	public function response_to_data( $response, $embed ) {
 		$data  = $response->get_data();
 		$links = self::get_compact_response_links( $response );
 
 		if ( ! empty( $links ) ) {
 			// Convert links to part of the data.
 			$data['_links'] = $links;
 		}
 
 		if ( $embed ) {
 			$this->embed_cache = array();
 			// Determine if this is a numeric array.
 			if ( wp_is_numeric_array( $data ) ) {
 				foreach ( $data as $key => $item ) {
 					$data[ $key ] = $this->embed_links( $item, $embed );
 				}
 			} else {
 				$data = $this->embed_links( $data, $embed );
 			}
 			$this->embed_cache = array();
 		}
 
 		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
 	 * @since 5.4.0 The $embed parameter can now contain a list of link relations to include.
 	 *
 	 * @param array         $data  Data from the request.
 	 * @param bool|string[] $embed Whether to embed all links or a filtered list of link relations.
 	 * @return array {
 	 *     Data with sub-requests embedded.
 	 *
 	 *     @type array $_links    Links.
 	 *     @type array $_embedded Embedded objects.
 	 * }
 	 */
 	protected function embed_links( $data, $embed = true ) {
 		if ( empty( $data['_links'] ) ) {
 			return $data;
 		}
 
 		$embedded = array();
 
 		foreach ( $data['_links'] as $rel => $links ) {
 			// If a list of relations was specified, and the link relation
 			// is not in the list of allowed relations, don't process the link.
 			if ( is_array( $embed ) && ! in_array( $rel, $embed, true ) ) {
 				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;
 				}
 
 				if ( ! array_key_exists( $item['href'], $this->embed_cache ) ) {
 					// 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 );
 
 					$this->embed_cache[ $item['href'] ] = $this->response_to_data( $response, false );
 				}
 
 				$embeds[] = $this->embed_cache[ $item['href'] ];
 			}
 
 			// 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 REST API response.
 		 *
 		 * @since 4.4.0
 		 *
 		 * @param array            $envelope {
 		 *     Envelope data.
 		 *
 		 *     @type array $body    Response data.
 		 *     @type int   $status  The 3-digit HTTP status code.
 		 *     @type array $headers Map of header name to header value.
 		 * }
 		 * @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
 	 * @since 5.4.0 Add $namespace parameter.
 	 *
 	 * @param string $namespace Optionally, only return routes in the given namespace.
 	 * @return array `'/path/regex' => array( $callback, $bitmask )` or
 	 *               `'/path/regex' => array( array( $callback, $bitmask ), ...)`.
 	 */
 	public function get_routes( $namespace = '' ) {
 		$endpoints = $this->endpoints;
 
 		if ( $namespace ) {
 			$endpoints = wp_list_filter( $endpoints, array( 'namespace' => $namespace ) );
 		}
 
 		/**
 		 * Filters the array of available REST API 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', $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 string[] 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 API 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  $server  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;
 		}
 
 		$error   = null;
 		$matched = $this->match_request_to_handler( $request );
 
 		if ( is_wp_error( $matched ) ) {
 			return $this->error_to_response( $matched );
 		}
 
 		list( $route, $handler ) = $matched;
 
 		if ( ! is_callable( $handler['callback'] ) ) {
 			$error = new WP_Error(
 				'rest_invalid_handler',
 				__( 'The handler for the route is invalid.' ),
 				array( 'status' => 500 )
 			);
 		}
 
 		if ( ! is_wp_error( $error ) ) {
 			$check_required = $request->has_valid_params();
 			if ( is_wp_error( $check_required ) ) {
 				$error = $check_required;
 			} else {
 				$check_sanitized = $request->sanitize_params();
 				if ( is_wp_error( $check_sanitized ) ) {
 					$error = $check_sanitized;
 				}
 			}
 		}
 
 		return $this->respond_to_request( $request, $route, $handler, $error );
 	}
 
 	/**
 	 * Matches a request object to its handler.
 	 *
 	 * @access private
 	 * @since 5.6.0
 	 *
 	 * @param WP_REST_Request $request The request object.
 	 * @return array|WP_Error The route and request handler on success or a WP_Error instance if no handler was found.
 	 */
 	protected function match_request_to_handler( $request ) {
 		$method = $request->get_method();
 		$path   = $request->get_route();
 
 		$with_namespace = array();
 
 		foreach ( $this->get_namespaces() as $namespace ) {
 			if ( 0 === strpos( trailingslashit( ltrim( $path, '/' ) ), $namespace ) ) {
 				$with_namespace[] = $this->get_routes( $namespace );
 			}
 		}
 
 		if ( $with_namespace ) {
 			$routes = array_merge( ...$with_namespace );
 		} else {
 			$routes = $this->get_routes();
 		}
 
 		foreach ( $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 ) ) {
 					return array( $route, $handler );
 				}
 
 				$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 );
 
 				return array( $route, $handler );
 			}
 		}
 
 		return new WP_Error(
 			'rest_no_route',
 			__( 'No route was found matching the URL and request method.' ),
 			array( 'status' => 404 )
 		);
 	}
 
 	/**
 	 * Dispatches the request to the callback handler.
 	 *
 	 * @access private
 	 * @since 5.6.0
 	 *
 	 * @param WP_REST_Request $request  The request object.
 	 * @param array           $handler  The matched route handler.
 	 * @param string          $route    The matched route regex.
 	 * @param WP_Error|null   $response The current error object if any.
 	 * @return WP_REST_Response
 	 */
 	protected function respond_to_request( $request, $route, $handler, $response ) {
 		/**
 		 * 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_REST_Response|WP_HTTP_Response|WP_Error|mixed $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 );
 
 		// Check permission specified on the route.
 		if ( ! is_wp_error( $response ) && ! 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( $response ) ) {
 			/**
 			 * Filters the REST API dispatch request result.
 			 *
 			 * Allow plugins to override dispatching the request.
 			 *
 			 * @since 4.4.0
 			 * @since 4.5.0 Added `$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( $handler['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_REST_Response|WP_HTTP_Response|WP_Error|mixed $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;
 	}
 
 	/**
 	 * 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 false|string Boolean false or string error message.
 	 */
 	protected function get_json_last_error() {
 		$last_error_code = json_last_error();
 
 		if ( 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 WP_REST_Response The API root index data.
 	 */
 	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', 'https://developer.wordpress.org/rest-api/' );
 		$this->add_active_theme_link_to_index( $response );
 		$this->add_site_logo_to_index( $response );
 
 		/**
 		 * Filters the REST 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 );
 	}
 
 	/**
 	 * Adds a link to the active theme for users who have proper permissions.
 	 *
 	 * @since 5.7.0
 	 *
 	 * @param WP_REST_Response $response REST API response.
 	 */
 	protected function add_active_theme_link_to_index( WP_REST_Response $response ) {
 		$should_add = current_user_can( 'switch_themes' ) || current_user_can( 'manage_network_themes' );
 
 		if ( ! $should_add && current_user_can( 'edit_posts' ) ) {
 			$should_add = true;
 		}
 
 		if ( ! $should_add ) {
 			foreach ( get_post_types( array( 'show_in_rest' => true ), 'objects' ) as $post_type ) {
 				if ( current_user_can( $post_type->cap->edit_posts ) ) {
 					$should_add = true;
 					break;
 				}
 			}
 		}
 
 		if ( $should_add ) {
 			$theme = wp_get_theme();
 			$response->add_link( 'https://api.w.org/active-theme', rest_url( 'wp/v2/themes/' . $theme->get_stylesheet() ) );
 		}
 	}
 
 	/**
 	 * Exposes the site logo through the WordPress REST API.
 	 * This is used for fetching this information when user has no rights
 	 * to update settings.
 	 *
 	 * @since 5.8.0
 	 *
 	 * @param WP_REST_Response $response REST API response.
 	 */
 	protected function add_site_logo_to_index( WP_REST_Response $response ) {
 		$site_logo_id                = get_theme_mod( 'custom_logo' );
 		$response->data['site_logo'] = $site_logo_id;
 		if ( $site_logo_id ) {
 			$response->add_link(
 				'https://api.w.org/featuredmedia',
 				rest_url( 'wp/v2/media/' . $site_logo_id ),
 				array(
 					'embeddable' => true,
 				)
 			);
 		}
 	}
 
 	/**
 	 * 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 REST API 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, keyed by route.
 	 */
 	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 API 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 REST API 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 Route data to expose in indexes, keyed by route.
 		 * @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'] );
 			}
 		}
 
 		$allowed_schema_keywords = array_flip( rest_get_allowed_schema_keywords() );
 
 		$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_intersect_key( $opts, $allowed_schema_keywords );
 					$arg_data['required'] = ! empty( $opts['required'] );
 
 					$endpoint_data['args'][ $key ] = $arg_data;
 				}
 			}
 
 			$data['endpoints'][] = $endpoint_data;
 
 			// For non-variable routes, generate links.
 			if ( strpos( $route, '{' ) === false ) {
 				$data['_links'] = array(
 					'self' => array(
 						array(
 							'href' => rest_url( $route ),
 						),
 					),
 				);
 			}
 		}
 
 		if ( empty( $data['methods'] ) ) {
 			// No methods supported, hide the route.
 			return null;
 		}
 
 		return $data;
 	}
 
 	/**
 	 * Gets the maximum number of requests that can be included in a batch.
 	 *
 	 * @since 5.6.0
 	 *
 	 * @return int The maximum requests.
 	 */
 	protected function get_max_batch_size() {
 		/**
 		 * Filters the maximum number of REST API requests that can be included in a batch.
 		 *
 		 * @since 5.6.0
 		 *
 		 * @param int $max_size The maximum size.
 		 */
 		return apply_filters( 'rest_get_max_batch_size', 25 );
 	}
 
 	/**
 	 * Serves the batch/v1 request.
 	 *
 	 * @since 5.6.0
 	 *
 	 * @param WP_REST_Request $batch_request The batch request object.
 	 * @return WP_REST_Response The generated response object.
 	 */
 	public function serve_batch_request_v1( WP_REST_Request $batch_request ) {
 		$requests = array();
 
 		foreach ( $batch_request['requests'] as $args ) {
 			$parsed_url = wp_parse_url( $args['path'] );
 
 			if ( false === $parsed_url ) {
 				$requests[] = new WP_Error( 'parse_path_failed', __( 'Could not parse the path.' ), array( 'status' => 400 ) );
 
 				continue;
 			}
 
 			$single_request = new WP_REST_Request( isset( $args['method'] ) ? $args['method'] : 'POST', $parsed_url['path'] );
 
 			if ( ! empty( $parsed_url['query'] ) ) {
 				$query_args = null; // Satisfy linter.
 				wp_parse_str( $parsed_url['query'], $query_args );
 				$single_request->set_query_params( $query_args );
 			}
 
 			if ( ! empty( $args['body'] ) ) {
 				$single_request->set_body_params( $args['body'] );
 			}
 
 			if ( ! empty( $args['headers'] ) ) {
 				$single_request->set_headers( $args['headers'] );
 			}
 
 			$requests[] = $single_request;
 		}
 
 		$matches    = array();
 		$validation = array();
 		$has_error  = false;
 
 		foreach ( $requests as $single_request ) {
 			$match     = $this->match_request_to_handler( $single_request );
 			$matches[] = $match;
 			$error     = null;
 
 			if ( is_wp_error( $match ) ) {
 				$error = $match;
 			}
 
 			if ( ! $error ) {
 				list( $route, $handler ) = $match;
 
 				if ( isset( $handler['allow_batch'] ) ) {
 					$allow_batch = $handler['allow_batch'];
 				} else {
 					$route_options = $this->get_route_options( $route );
 					$allow_batch   = isset( $route_options['allow_batch'] ) ? $route_options['allow_batch'] : false;
 				}
 
 				if ( ! is_array( $allow_batch ) || empty( $allow_batch['v1'] ) ) {
 					$error = new WP_Error(
 						'rest_batch_not_allowed',
 						__( 'The requested route does not support batch requests.' ),
 						array( 'status' => 400 )
 					);
 				}
 			}
 
 			if ( ! $error ) {
 				$check_required = $single_request->has_valid_params();
 				if ( is_wp_error( $check_required ) ) {
 					$error = $check_required;
 				}
 			}
 
 			if ( ! $error ) {
 				$check_sanitized = $single_request->sanitize_params();
 				if ( is_wp_error( $check_sanitized ) ) {
 					$error = $check_sanitized;
 				}
 			}
 
 			if ( $error ) {
 				$has_error    = true;
 				$validation[] = $error;
 			} else {
 				$validation[] = true;
 			}
 		}
 
 		$responses = array();
 
 		if ( $has_error && 'require-all-validate' === $batch_request['validation'] ) {
 			foreach ( $validation as $valid ) {
 				if ( is_wp_error( $valid ) ) {
 					$responses[] = $this->envelope_response( $this->error_to_response( $valid ), false )->get_data();
 				} else {
 					$responses[] = null;
 				}
 			}
 
 			return new WP_REST_Response(
 				array(
 					'failed'    => 'validation',
 					'responses' => $responses,
 				),
 				WP_Http::MULTI_STATUS
 			);
 		}
 
 		foreach ( $requests as $i => $single_request ) {
 			$clean_request = clone $single_request;
 			$clean_request->set_url_params( array() );
 			$clean_request->set_attributes( array() );
 			$clean_request->set_default_params( array() );
 
 			/** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */
 			$result = apply_filters( 'rest_pre_dispatch', null, $this, $clean_request );
 
 			if ( empty( $result ) ) {
 				$match = $matches[ $i ];
 				$error = null;
 
 				if ( is_wp_error( $validation[ $i ] ) ) {
 					$error = $validation[ $i ];
 				}
 
 				if ( is_wp_error( $match ) ) {
 					$result = $this->error_to_response( $match );
 				} else {
 					list( $route, $handler ) = $match;
 
 					if ( ! $error && ! is_callable( $handler['callback'] ) ) {
 						$error = new WP_Error(
 							'rest_invalid_handler',
 							__( 'The handler for the route is invalid' ),
 							array( 'status' => 500 )
 						);
 					}
 
 					$result = $this->respond_to_request( $single_request, $route, $handler, $error );
 				}
 			}
 
 			/** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */
 			$result = apply_filters( 'rest_post_dispatch', rest_ensure_response( $result ), $this, $single_request );
 
 			$responses[] = $this->envelope_response( $result, false )->get_data();
 		}
 
 		return new WP_REST_Response( array( 'responses' => $responses ), WP_Http::MULTI_STATUS );
 	}
 
 	/**
 	 * 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 ) {
 		header_remove( $key );
 	}
 
 	/**
 	 * 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() {
 		// phpcs:disable PHPCompatibility.Variables.RemovedPredefinedGlobalVariables.http_raw_post_dataDeprecatedRemoved
 		global $HTTP_RAW_POST_DATA;
 
 		// $HTTP_RAW_POST_DATA was deprecated in PHP 5.6 and removed in PHP 7.0.
 		if ( ! isset( $HTTP_RAW_POST_DATA ) ) {
 			$HTTP_RAW_POST_DATA = file_get_contents( 'php://input' );
 		}
 
 		return $HTTP_RAW_POST_DATA;
 		// phpcs:enable
 	}
 
 	/**
 	 * 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 ( 'REDIRECT_HTTP_AUTHORIZATION' === $key && empty( $server['HTTP_AUTHORIZATION'] ) ) {
 				/*
 				 * In some server configurations, the authorization header is passed in this alternate location.
 				 * Since it would not be passed in in both places we do not check for both headers and resolve.
 				 */
 				$headers['AUTHORIZATION'] = $value;
 			} elseif ( isset( $additional[ $key ] ) ) {
 				$headers[ $key ] = $value;
 			}
 		}
 
 		return $headers;
 	}
 }