Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1877 insertions, 0 deletions

diff --git a/wp-includes/rest-api/class-wp-rest-server.php b/wp-includes/rest-api/class-wp-rest-server.php
new file mode 100644
index 0000000..a1bc4b9
--- /dev/null
+++ b/wp-includes/rest-api/class-wp-rest-server.php
@@ -0,0 +1,1877 @@
+<?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();
+
+	/**
+	 * 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 nocache 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 rest-api.php
+		 *
+		 * @param bool $rest_send_nocache_headers Whether to send no-cache headers.
+		 */
+		$send_no_cache_headers = apply_filters( 'rest_send_nocache_headers', is_user_logged_in() );
+
+		// send no cache headers if the $send_no_cache_headers is true
+		// OR if the HTTP_X_HTTP_METHOD_OVERRIDE is used but resulted a 4x response code.
+		if ( $send_no_cache_headers || ( true === $method_overridden && strpos( $code, '4' ) === 0 ) ) {
+			foreach ( wp_get_nocache_headers() as $header => $header_value ) {
+				if ( empty( $header_value ) ) {
+					$this->remove_header( $header );
+				} else {
+					$this->send_header( $header, $header_value );
+				}
+			}
+		}
+
+		/**
+		 * 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'];
+				$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 ( ! 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';
+					}
+
+					$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 ) {
+		/**
+		 * 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 );
+			}
+
+			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 ( 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 = 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 ( 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;
+	}
+}