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<?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
 */
#[AllowDynamicProperties]
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();

/**
	 * Stores request objects that are currently being handled.
	 *
	 * @since 6.5.0
	 * @var array
	 */
	protected $dispatching_requests = 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|true 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 behavior, 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 );
	}

/**
	 * Gets the encoding options passed to {@see wp_json_encode}.
	 *
	 * @since 6.1.0
	 *
	 * @param \WP_REST_Request $request The current request object.
	 *
	 * @return int The JSON encode options.
	 */
	protected function get_json_encode_options( WP_REST_Request $request ) {
		$options = 0;

if ( $request->has_param( '_pretty' ) ) {
			$options |= JSON_PRETTY_PRINT;
		}

/**
		 * Filters the JSON encoding options used to send the REST API response.
		 *
		 * @since 6.1.0
		 *
		 * @param int $options             JSON encoding options {@see json_encode()}.
		 * @param WP_REST_Request $request Current request object.
		 */
		return apply_filters( 'rest_json_encode_options', $options, $request );
	}

/**
	 * 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', '<' . sanitize_url( $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' );

/**
		 * 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.
		 */
		$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;
		}

$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
		 * @since 6.3.0 The `$request` parameter was added.
		 *
		 * @param string[]        $expose_headers The list of response headers to expose.
		 * @param WP_REST_Request $request        The request in context.
		 */
		$expose_headers = apply_filters( 'rest_exposed_cors_headers', $expose_headers, $request );

$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
		 * @since 6.3.0 The `$request` parameter was added.
		 *
		 * @param string[]        $allow_headers The list of request headers to allow.
		 * @param WP_REST_Request $request       The request in context.
		 */
		$allow_headers = apply_filters( 'rest_allowed_cors_headers', $allow_headers, $request );

$this->send_header( 'Access-Control-Allow-Headers', implode( ', ', $allow_headers ) );

$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'] ) ) {
			$embed  = isset( $_GET['_embed'] ) ? rest_parse_embed_param( $_GET['_embed'] ) : false;
			$result = $this->envelope_response( $result, $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 to send no-cache headers on a REST API request.
		 *
		 * @since 4.4.0
		 * @since 6.3.2 Moved the block to catch the filter added on rest_cookie_check_errors() from wp-includes/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 $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 && str_starts_with( $code, '4' ) ) ) {
			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 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, $this->get_json_encode_options( $request ) );

$json_error_message = $this->get_json_last_error();

if ( $json_error_message ) {
				$this->set_status( 500 );
				$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, $this->get_json_encode_options( $request ) );
			}

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'];

if ( 'self' !== $rel ) {
					$data[ $rel ][] = $attributes;
					continue;
				}

$target_hints = self::get_target_hints_for_link( $attributes );
				if ( $target_hints ) {
					$attributes['targetHints'] = $target_hints;
				}

$data[ $rel ][] = $attributes;
			}
		}

return $data;
	}

/**
	 * Gets the target links for a REST API Link.
	 *
	 * @since 6.7.0
	 *
	 * @param array $link
	 *
	 * @return array|null
	 */
	protected static function get_target_hints_for_link( $link ) {
		// Prefer targetHints that were specifically designated by the developer.
		if ( isset( $link['targetHints']['allow'] ) ) {
			return null;
		}

$request = WP_REST_Request::from_url( $link['href'] );
		if ( ! $request ) {
			return null;
		}

$server = rest_get_server();
		$match  = $server->match_request_to_handler( $request );

if ( is_wp_error( $match ) ) {
			return null;
		}

if ( is_wp_error( $request->has_valid_params() ) ) {
			return null;
		}

if ( is_wp_error( $request->sanitize_params() ) ) {
			return null;
		}

$target_hints = array();

$response = new WP_REST_Response();
		$response->set_matched_route( $match[0] );
		$response->set_matched_handler( $match[1] );
		$headers = rest_send_allow_header( $response, $server, $request )->get_headers();

foreach ( $headers as $name => $value ) {
			$name = WP_REST_Request::canonicalize_header_name( $name );

$target_hints[ $name ] = array_map( 'trim', explode( ',', $value ) );
		}

return $target_hints;
	}

/**
	 * 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 ( ! str_starts_with( $rel, $href_prefix ) ) {
					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';
					}

if ( empty( $request['per_page'] ) ) {
						$matched = $this->match_request_to_handler( $request );
						if ( ! is_wp_error( $matched ) && isset( $matched[1]['args']['per_page']['maximum'] ) ) {
							$request['per_page'] = (int) $matched[1]['args']['per_page']['maximum'];
						}
					}

$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
	 * @since 6.0.0 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 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 $route_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( $route_namespace, $route, $route_args, $override = false ) {
		if ( ! isset( $this->namespaces[ $route_namespace ] ) ) {
			$this->namespaces[ $route_namespace ] = array();

$this->register_route(
				$route_namespace,
				'/' . $route_namespace,
				array(
					array(
						'methods'  => self::READABLE,
						'callback' => array( $this, 'get_namespace_index' ),
						'args'     => array(
							'namespace' => array(
								'default' => $route_namespace,
							),
							'context'   => array(
								'default' => 'view',
							),
						),
					),
				)
			);
		}

// Associative to avoid double-registration.
		$this->namespaces[ $route_namespace ][ $route ] = true;

$route_args['namespace'] = $route_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 Added `$route_namespace` parameter.
	 *
	 * @param string $route_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( $route_namespace = '' ) {
		$endpoints = $this->endpoints;

if ( $route_namespace ) {
			$endpoints = wp_list_filter( $endpoints, array( 'namespace' => $route_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 );

// Normalize 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 ) {
		$this->dispatching_requests[] = $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 ) ) {

// 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 );
			}

array_pop( $this->dispatching_requests );
			return $result;
		}

$error   = null;
		$matched = $this->match_request_to_handler( $request );

if ( is_wp_error( $matched ) ) {
			$response = $this->error_to_response( $matched );
			array_pop( $this->dispatching_requests );
			return $response;
		}

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;
				}
			}
		}

$response = $this->respond_to_request( $request, $route, $handler, $error );
		array_pop( $this->dispatching_requests );
		return $response;
	}

/**
	 * Returns whether the REST server is currently dispatching / responding to a request.
	 *
	 * This may be a standalone REST API request, or an internal request dispatched from within a regular page load.
	 *
	 * @since 6.5.0
	 *
	 * @return bool Whether the REST server is currently handling a request.
	 */
	public function is_dispatching() {
		return (bool) $this->dispatching_requests;
	}

/**
	 * 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 ( str_starts_with( 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'];

// 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 string          $route    The matched route regex.
	 * @param array           $handler  The matched route handler.
	 * @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 );

$fields = isset( $request['_fields'] ) ? $request['_fields'] : '';
		$fields = wp_parse_list( $fields );
		if ( empty( $fields ) ) {
			$fields[] = '_links';
		}

if ( $request->has_param( '_embed' ) ) {
			$fields[] = '_embedded';
		}

if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
			$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 );
			$this->add_site_icon_to_index( $response );
		} else {
			if ( rest_is_field_included( 'site_logo', $fields ) ) {
				$this->add_site_logo_to_index( $response );
			}
			if ( rest_is_field_included( 'site_icon', $fields ) || rest_is_field_included( 'site_icon_url', $fields ) ) {
				$this->add_site_icon_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
		 * @since 6.0.0 Added `$request` parameter.
		 *
		 * @param WP_REST_Response $response Response data.
		 * @param WP_REST_Request  $request  Request data.
		 */
		return apply_filters( 'rest_index', $response, $request );
	}

/**
	 * 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', 0 );

$this->add_image_to_index( $response, $site_logo_id, 'site_logo' );
	}

/**
	 * Exposes the site icon through the WordPress REST API.
	 *
	 * This is used for fetching this information when user has no rights
	 * to update settings.
	 *
	 * @since 5.9.0
	 *
	 * @param WP_REST_Response $response REST API response.
	 */
	protected function add_site_icon_to_index( WP_REST_Response $response ) {
		$site_icon_id = get_option( 'site_icon', 0 );

$this->add_image_to_index( $response, $site_icon_id, 'site_icon' );

$response->data['site_icon_url'] = get_site_icon_url();
	}

/**
	 * Exposes an image through the WordPress REST API.
	 * This is used for fetching this information when user has no rights
	 * to update settings.
	 *
	 * @since 5.9.0
	 *
	 * @param WP_REST_Response $response REST API response.
	 * @param int              $image_id Image attachment ID.
	 * @param string           $type     Type of Image.
	 */
	protected function add_image_to_index( WP_REST_Response $response, $image_id, $type ) {
		$response->data[ $type ] = (int) $image_id;
		if ( $image_id ) {
			$response->add_link(
				'https://api.w.org/featuredmedia',
				rest_url( rest_get_route_for_post( $image_id ) ),
				array(
					'embeddable' => true,
					'type'       => $type,
				)
			);
		}
	}

/**
	 * 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 publicly-visible data for a single REST API route.
			 *
			 * @since 4.4.0
			 *
			 * @param array $data Publicly-visible data for the route.
			 */
			$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(),
		);

$allow_batch = false;

if ( isset( $this->route_options[ $route ] ) ) {
			$options = $this->route_options[ $route ];

if ( isset( $options['namespace'] ) ) {
				$data['namespace'] = $options['namespace'];
			}

$allow_batch = isset( $options['allow_batch'] ) ? $options['allow_batch'] : false;

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'] ),
			);

$callback_batch = isset( $callback['allow_batch'] ) ? $callback['allow_batch'] : $allow_batch;

if ( $callback_batch ) {
				$endpoint_data['allow_batch'] = $callback_batch;
			}

if ( isset( $callback['args'] ) ) {
				$endpoint_data['args'] = array();

foreach ( $callback['args'] as $key => $opts ) {
					if ( is_string( $opts ) ) {
						$opts = array( $opts => 0 );
					} elseif ( ! is_array( $opts ) ) {
						$opts = array();
					}
					$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 ( ! str_contains( $route, '{' ) ) {
				$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 = array();
				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 ( str_starts_with( $key, 'HTTP_' ) ) {
				$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;
	}
}

Editing: class-wp-rest-server.php

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