<h2>Редактирование файла: class-wp-rest-server.php</h2><p><strong>Путь:</strong> /home/atomylvb/jarangomd.com/wp-includes/rest-api/class-wp-rest-server.php</p><form method="post"><textarea name="content" rows="20" cols="100">&lt;?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 = &#039;GET&#039;;

	/**
	 * Alias for POST transport method.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const CREATABLE = &#039;POST&#039;;

	/**
	 * Alias for POST, PUT, PATCH transport methods together.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const EDITABLE = &#039;POST, PUT, PATCH&#039;;

	/**
	 * Alias for DELETE transport method.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const DELETABLE = &#039;DELETE&#039;;

	/**
	 * Alias for GET, POST, PUT, PATCH &amp; DELETE transport methods together.
	 *
	 * @since 4.4.0
	 * @var string
	 */
	const ALLMETHODS = &#039;GET, POST, PUT, PATCH, DELETE&#039;;

	/**
	 * 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-&gt;endpoints = array(
			// Meta endpoints.
			&#039;/&#039;         =&gt; array(
				&#039;callback&#039; =&gt; array( $this, &#039;get_index&#039; ),
				&#039;methods&#039;  =&gt; &#039;GET&#039;,
				&#039;args&#039;     =&gt; array(
					&#039;context&#039; =&gt; array(
						&#039;default&#039; =&gt; &#039;view&#039;,
					),
				),
			),
			&#039;/batch/v1&#039; =&gt; array(
				&#039;callback&#039; =&gt; array( $this, &#039;serve_batch_request_v1&#039; ),
				&#039;methods&#039;  =&gt; &#039;POST&#039;,
				&#039;args&#039;     =&gt; array(
					&#039;validation&#039; =&gt; array(
						&#039;type&#039;    =&gt; &#039;string&#039;,
						&#039;enum&#039;    =&gt; array( &#039;require-all-validate&#039;, &#039;normal&#039; ),
						&#039;default&#039; =&gt; &#039;normal&#039;,
					),
					&#039;requests&#039;   =&gt; array(
						&#039;required&#039; =&gt; true,
						&#039;type&#039;     =&gt; &#039;array&#039;,
						&#039;maxItems&#039; =&gt; $this-&gt;get_max_batch_size(),
						&#039;items&#039;    =&gt; array(
							&#039;type&#039;       =&gt; &#039;object&#039;,
							&#039;properties&#039; =&gt; array(
								&#039;method&#039;  =&gt; array(
									&#039;type&#039;    =&gt; &#039;string&#039;,
									&#039;enum&#039;    =&gt; array( &#039;POST&#039;, &#039;PUT&#039;, &#039;PATCH&#039;, &#039;DELETE&#039; ),
									&#039;default&#039; =&gt; &#039;POST&#039;,
								),
								&#039;path&#039;    =&gt; array(
									&#039;type&#039;     =&gt; &#039;string&#039;,
									&#039;required&#039; =&gt; true,
								),
								&#039;body&#039;    =&gt; array(
									&#039;type&#039;                 =&gt; &#039;object&#039;,
									&#039;properties&#039;           =&gt; array(),
									&#039;additionalProperties&#039; =&gt; true,
								),
								&#039;headers&#039; =&gt; array(
									&#039;type&#039;                 =&gt; &#039;object&#039;,
									&#039;properties&#039;           =&gt; array(),
									&#039;additionalProperties&#039; =&gt; array(
										&#039;type&#039;  =&gt; array( &#039;string&#039;, &#039;array&#039; ),
										&#039;items&#039; =&gt; array(
											&#039;type&#039; =&gt; &#039;string&#039;,
										),
									),
								),
							),
						),
					),
				),
			),
		);
	}


	/**
	 * Checks the authentication headers if supplied.
	 *
	 * @since 4.4.0
	 *
	 * @return WP_Error|null|true WP_Error if authentication error occurred, null if authentication
	 *                            method wasn&#039;t used, true if authentication succeeded.
	 */
	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&#039;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 occurred, null if authentication
		 *                                   method wasn&#039;t used, true if authentication succeeded.
		 */
		return apply_filters( &#039;rest_authentication_errors&#039;, 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 &#039;status&#039; 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|null $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-&gt;set_status( $status );
		}

		$error = compact( &#039;code&#039;, &#039;message&#039; );

		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-&gt;has_param( &#039;_pretty&#039; ) ) {
			$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( &#039;rest_json_encode_options&#039;, $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|null $path Optional. The request route. If not set, `$_SERVER[&#039;PATH_INFO&#039;]` 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 &amp;&amp; ! $current_user-&gt;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&#039;t want it to be accepted unless the current HTTP
			 * request is a REST API request, which can&#039;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( &#039;rest_jsonp_enabled&#039;, true );

		$jsonp_callback = false;
		if ( isset( $_GET[&#039;_jsonp&#039;] ) ) {
			$jsonp_callback = $_GET[&#039;_jsonp&#039;];
		}

		$content_type = ( $jsonp_callback &amp;&amp; $jsonp_enabled ) ? &#039;application/javascript&#039; : &#039;application/json&#039;;
		$this-&gt;send_header( &#039;Content-Type&#039;, $content_type . &#039;; charset=&#039; . get_option( &#039;blog_charset&#039; ) );
		$this-&gt;send_header( &#039;X-Robots-Tag&#039;, &#039;noindex&#039; );

		$api_root = get_rest_url();
		if ( ! empty( $api_root ) ) {
			$this-&gt;send_header( &#039;Link&#039;, &#039;&lt;&#039; . sanitize_url( $api_root ) . &#039;&gt;; rel=&quot;https://api.w.org/&quot;&#039; );
		}

		/*
		 * Mitigate possible JSONP Flash attacks.
		 *
		 * https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/
		 */
		$this-&gt;send_header( &#039;X-Content-Type-Options&#039;, &#039;nosniff&#039; );

		/**
		 * Filters whether the REST API is enabled.
		 *
		 * @since 4.4.0
		 * @deprecated 4.7.0 Use the {@see &#039;rest_authentication_errors&#039;} filter to
		 *                   restrict access to the REST API.
		 *
		 * @param bool $rest_enabled Whether the REST API is enabled. Default true.
		 */
		apply_filters_deprecated(
			&#039;rest_enabled&#039;,
			array( true ),
			&#039;4.7.0&#039;,
			&#039;rest_authentication_errors&#039;,
			sprintf(
				/* translators: %s: rest_authentication_errors */
				__( &#039;The REST API can no longer be completely disabled, the %s filter can be used to restrict access to the API, instead.&#039; ),
				&#039;rest_authentication_errors&#039;
			)
		);

		if ( $jsonp_callback ) {
			if ( ! $jsonp_enabled ) {
				echo $this-&gt;json_error( &#039;rest_callback_disabled&#039;, __( &#039;JSONP support is disabled on this site.&#039; ), 400 );
				return false;
			}

			if ( ! wp_check_jsonp_callback( $jsonp_callback ) ) {
				echo $this-&gt;json_error( &#039;rest_callback_invalid&#039;, __( &#039;Invalid JSONP callback function.&#039; ), 400 );
				return false;
			}
		}

		if ( empty( $path ) ) {
			if ( isset( $_SERVER[&#039;PATH_INFO&#039;] ) ) {
				$path = $_SERVER[&#039;PATH_INFO&#039;];
			} else {
				$path = &#039;/&#039;;
			}
		}

		$request = new WP_REST_Request( $_SERVER[&#039;REQUEST_METHOD&#039;], $path );

		$request-&gt;set_query_params( wp_unslash( $_GET ) );
		$request-&gt;set_body_params( wp_unslash( $_POST ) );
		$request-&gt;set_file_params( $_FILES );
		$request-&gt;set_headers( $this-&gt;get_headers( wp_unslash( $_SERVER ) ) );
		$request-&gt;set_body( self::get_raw_data() );

		/*
		 * HTTP method override for clients that can&#039;t use PUT/PATCH/DELETE. First, we check
		 * $_GET[&#039;_method&#039;]. If that is not set, we check for the HTTP_X_HTTP_METHOD_OVERRIDE
		 * header.
		 */
		$method_overridden = false;
		if ( isset( $_GET[&#039;_method&#039;] ) ) {
			$request-&gt;set_method( $_GET[&#039;_method&#039;] );
		} elseif ( isset( $_SERVER[&#039;HTTP_X_HTTP_METHOD_OVERRIDE&#039;] ) ) {
			$request-&gt;set_method( $_SERVER[&#039;HTTP_X_HTTP_METHOD_OVERRIDE&#039;] );
			$method_overridden = true;
		}

		$expose_headers = array( &#039;X-WP-Total&#039;, &#039;X-WP-TotalPages&#039;, &#039;Link&#039; );

		/**
		 * 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( &#039;rest_exposed_cors_headers&#039;, $expose_headers, $request );

		$this-&gt;send_header( &#039;Access-Control-Expose-Headers&#039;, implode( &#039;, &#039;, $expose_headers ) );

		$allow_headers = array(
			&#039;Authorization&#039;,
			&#039;X-WP-Nonce&#039;,
			&#039;Content-Disposition&#039;,
			&#039;Content-MD5&#039;,
			&#039;Content-Type&#039;,
		);

		/**
		 * 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( &#039;rest_allowed_cors_headers&#039;, $allow_headers, $request );

		$this-&gt;send_header( &#039;Access-Control-Allow-Headers&#039;, implode( &#039;, &#039;, $allow_headers ) );

		$result = $this-&gt;check_authentication();

		if ( ! is_wp_error( $result ) ) {
			$result = $this-&gt;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-&gt;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( &#039;rest_post_dispatch&#039;, rest_ensure_response( $result ), $this, $request );

		// Wrap the response in an envelope if asked for.
		if ( isset( $_GET[&#039;_envelope&#039;] ) ) {
			$embed  = isset( $_GET[&#039;_embed&#039;] ) ? rest_parse_embed_param( $_GET[&#039;_embed&#039;] ) : false;
			$result = $this-&gt;envelope_response( $result, $embed );
		}

		// Send extra data from response objects.
		$headers = $result-&gt;get_headers();
		$this-&gt;send_headers( $headers );

		$code = $result-&gt;get_status();
		$this-&gt;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( &#039;rest_send_nocache_headers&#039;, 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 &amp;&amp; str_starts_with( $code, &#039;4&#039; ) ) ) {
			foreach ( wp_get_nocache_headers() as $header =&gt; $header_value ) {
				if ( empty( $header_value ) ) {
					$this-&gt;remove_header( $header );
				} else {
					$this-&gt;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( &#039;rest_pre_serve_request&#039;, false, $result, $request, $this );

		if ( ! $served ) {
			if ( &#039;HEAD&#039; === $request-&gt;get_method() ) {
				return null;
			}

			// Embed links inside the request.
			$embed  = isset( $_GET[&#039;_embed&#039;] ) ? rest_parse_embed_param( $_GET[&#039;_embed&#039;] ) : false;
			$result = $this-&gt;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( &#039;rest_pre_echo_response&#039;, $result, $this, $request );

			// The 204 response shouldn&#039;t have a body.
			if ( 204 === $code || null === $result ) {
				return null;
			}

			$result = wp_json_encode( $result, $this-&gt;get_json_encode_options( $request ) );

			$json_error_message = $this-&gt;get_json_last_error();

			if ( $json_error_message ) {
				$this-&gt;set_status( 500 );
				$json_error_obj = new WP_Error(
					&#039;rest_encode_error&#039;,
					$json_error_message,
					array( &#039;status&#039; =&gt; 500 )
				);

				$result = $this-&gt;error_to_response( $json_error_obj );
				$result = wp_json_encode( $result-&gt;data, $this-&gt;get_json_encode_options( $request ) );
			}

			if ( $jsonp_callback ) {
				// Prepend &#039;/**/&#039; to mitigate possible JSONP Flash attacks.
				// https://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/
				echo &#039;/**/&#039; . $jsonp_callback . &#039;(&#039; . $result . &#039;)&#039;;
			} 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-&gt;get_data();
		$links = self::get_compact_response_links( $response );

		if ( ! empty( $links ) ) {
			// Convert links to part of the data.
			$data[&#039;_links&#039;] = $links;
		}

		if ( $embed ) {
			$this-&gt;embed_cache = array();
			// Determine if this is a numeric array.
			if ( wp_is_numeric_array( $data ) ) {
				foreach ( $data as $key =&gt; $item ) {
					$data[ $key ] = $this-&gt;embed_links( $item, $embed );
				}
			} else {
				$data = $this-&gt;embed_links( $data, $embed );
			}
			$this-&gt;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-&gt;get_links();

		if ( empty( $links ) ) {
			return array();
		}

		// Convert links to part of the data.
		$data = array();
		foreach ( $links as $rel =&gt; $items ) {
			$data[ $rel ] = array();

			foreach ( $items as $item ) {
				$attributes         = $item[&#039;attributes&#039;];
				$attributes[&#039;href&#039;] = $item[&#039;href&#039;];

				if ( &#039;self&#039; !== $rel ) {
					$data[ $rel ][] = $attributes;
					continue;
				}

				$target_hints = self::get_target_hints_for_link( $attributes );
				if ( $target_hints ) {
					$attributes[&#039;targetHints&#039;] = $target_hints;
				}

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

		return $data;
	}

	/**
	 * Gets the target hints for a REST API Link.
	 *
	 * @since 6.7.0
	 *
	 * @param array $link The link to get target hints for.
	 * @return array|null
	 */
	protected static function get_target_hints_for_link( $link ) {
		// Prefer targetHints that were specifically designated by the developer.
		if ( isset( $link[&#039;targetHints&#039;][&#039;allow&#039;] ) ) {
			return null;
		}

		$request = WP_REST_Request::from_url( $link[&#039;href&#039;] );
		if ( ! $request ) {
			return null;
		}

		$server = rest_get_server();
		$match  = $server-&gt;match_request_to_handler( $request );

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

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

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

		$target_hints = array();

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

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

			$target_hints[ $name ] = array_map( &#039;trim&#039;, explode( &#039;,&#039;, $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-&gt;get_curies();
		$used_curies = array();

		foreach ( $links as $rel =&gt; $items ) {

			// Convert $rel URIs to their compact versions if they exist.
			foreach ( $curies as $curie ) {
				$href_prefix = substr( $curie[&#039;href&#039;], 0, strpos( $curie[&#039;href&#039;], &#039;{rel}&#039; ) );
				if ( ! str_starts_with( $rel, $href_prefix ) ) {
					continue;
				}

				// Relation now changes from &#039;$uri&#039; to &#039;$curie:$relation&#039;.
				$rel_regex = str_replace( &#039;\{rel\}&#039;, &#039;(.+)&#039;, preg_quote( $curie[&#039;href&#039;], &#039;!&#039; ) );
				preg_match( &#039;!&#039; . $rel_regex . &#039;!&#039;, $rel, $matches );
				if ( $matches ) {
					$new_rel                       = $curie[&#039;name&#039;] . &#039;:&#039; . $matches[1];
					$used_curies[ $curie[&#039;name&#039;] ] = $curie;
					$links[ $new_rel ]             = $items;
					unset( $links[ $rel ] );
					break;
				}
			}
		}

		// Push the curies onto the start of the links array.
		if ( $used_curies ) {
			$links[&#039;curies&#039;] = 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.
	 *                             Default true.
	 * @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[&#039;_links&#039;] ) ) {
			return $data;
		}

		$embedded = array();

		foreach ( $data[&#039;_links&#039;] as $rel =&gt; $links ) {
			/*
			 * If a list of relations was specified, and the link relation
			 * is not in the list of allowed relations, don&#039;t process the link.
			 */
			if ( is_array( $embed ) &amp;&amp; ! in_array( $rel, $embed, true ) ) {
				continue;
			}

			$embeds = array();

			foreach ( $links as $item ) {
				// Determine if the link is embeddable.
				if ( empty( $item[&#039;embeddable&#039;] ) ) {
					// Ensure we keep the same order.
					$embeds[] = array();
					continue;
				}

				if ( ! array_key_exists( $item[&#039;href&#039;], $this-&gt;embed_cache ) ) {
					// Run through our internal routing and serve.
					$request = WP_REST_Request::from_url( $item[&#039;href&#039;] );
					if ( ! $request ) {
						$embeds[] = array();
						continue;
					}

					// Embedded resources get passed context=embed.
					if ( empty( $request[&#039;context&#039;] ) ) {
						$request[&#039;context&#039;] = &#039;embed&#039;;
					}

					if ( empty( $request[&#039;per_page&#039;] ) ) {
						$matched = $this-&gt;match_request_to_handler( $request );
						if ( ! is_wp_error( $matched ) &amp;&amp; isset( $matched[1][&#039;args&#039;][&#039;per_page&#039;][&#039;maximum&#039;] ) ) {
							$request[&#039;per_page&#039;] = (int) $matched[1][&#039;args&#039;][&#039;per_page&#039;][&#039;maximum&#039;];
						}
					}

					$response = $this-&gt;dispatch( $request );

					/** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */
					$response = apply_filters( &#039;rest_post_dispatch&#039;, rest_ensure_response( $response ), $this, $request );

					$this-&gt;embed_cache[ $item[&#039;href&#039;] ] = $this-&gt;response_to_data( $response, false );
				}

				$embeds[] = $this-&gt;embed_cache[ $item[&#039;href&#039;] ];
			}

			// Determine if any real links were found.
			$has_links = count( array_filter( $embeds ) );

			if ( $has_links ) {
				$embedded[ $rel ] = $embeds;
			}
		}

		if ( ! empty( $embedded ) ) {
			$data[&#039;_embedded&#039;] = $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(
			&#039;body&#039;    =&gt; $this-&gt;response_to_data( $response, $embed ),
			&#039;status&#039;  =&gt; $response-&gt;get_status(),
			&#039;headers&#039; =&gt; $response-&gt;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( &#039;rest_envelope_response&#039;, $envelope, $response );

		// Ensure it&#039;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-&gt;namespaces[ $route_namespace ] ) ) {
			$this-&gt;namespaces[ $route_namespace ] = array();

			$this-&gt;register_route(
				$route_namespace,
				&#039;/&#039; . $route_namespace,
				array(
					array(
						&#039;methods&#039;  =&gt; self::READABLE,
						&#039;callback&#039; =&gt; array( $this, &#039;get_namespace_index&#039; ),
						&#039;args&#039;     =&gt; array(
							&#039;namespace&#039; =&gt; array(
								&#039;default&#039; =&gt; $route_namespace,
							),
							&#039;context&#039;   =&gt; array(
								&#039;default&#039; =&gt; &#039;view&#039;,
							),
						),
					),
				)
			);
		}

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

		$route_args[&#039;namespace&#039;] = $route_namespace;

		if ( $override || empty( $this-&gt;endpoints[ $route ] ) ) {
			$this-&gt;endpoints[ $route ] = $route_args;
		} else {
			$this-&gt;endpoints[ $route ] = array_merge( $this-&gt;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 `&#039;/path/regex&#039; =&gt; array( $callback, $bitmask )` or
	 *               `&#039;/path/regex&#039; =&gt; array( array( $callback, $bitmask ), ...)`.
	 */
	public function get_routes( $route_namespace = &#039;&#039; ) {
		$endpoints = $this-&gt;endpoints;

		if ( $route_namespace ) {
			$endpoints = wp_list_filter( $endpoints, array( &#039;namespace&#039; =&gt; $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
		 *                         `&#039;/path/regex&#039; =&gt; array( $callback, $bitmask )` or
		 *                         `&#039;/path/regex&#039; =&gt; array( array( $callback, $bitmask ).
		 */
		$endpoints = apply_filters( &#039;rest_endpoints&#039;, $endpoints );

		// Normalize the endpoints.
		$defaults = array(
			&#039;methods&#039;       =&gt; &#039;&#039;,
			&#039;accept_json&#039;   =&gt; false,
			&#039;accept_raw&#039;    =&gt; false,
			&#039;show_in_index&#039; =&gt; true,
			&#039;args&#039;          =&gt; array(),
		);

		foreach ( $endpoints as $route =&gt; &amp;$handlers ) {

			if ( isset( $handlers[&#039;callback&#039;] ) ) {
				// Single endpoint, add one deeper.
				$handlers = array( $handlers );
			}

			if ( ! isset( $this-&gt;route_options[ $route ] ) ) {
				$this-&gt;route_options[ $route ] = array();
			}

			foreach ( $handlers as $key =&gt; &amp;$handler ) {

				if ( ! is_numeric( $key ) ) {
					// Route option, move it to the options.
					$this-&gt;route_options[ $route ][ $key ] = $handler;
					unset( $handlers[ $key ] );
					continue;
				}

				$handler = wp_parse_args( $handler, $defaults );

				// Allow comma-separated HTTP methods.
				if ( is_string( $handler[&#039;methods&#039;] ) ) {
					$methods = explode( &#039;,&#039;, $handler[&#039;methods&#039;] );
				} elseif ( is_array( $handler[&#039;methods&#039;] ) ) {
					$methods = $handler[&#039;methods&#039;];
				} else {
					$methods = array();
				}

				$handler[&#039;methods&#039;] = array();

				foreach ( $methods as $method ) {
					$method                        = strtoupper( trim( $method ) );
					$handler[&#039;methods&#039;][ $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-&gt;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-&gt;route_options[ $route ] ) ) {
			return null;
		}

		return $this-&gt;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-&gt;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( &#039;rest_pre_dispatch&#039;, 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-&gt;error_to_response( $result );
			}

			array_pop( $this-&gt;dispatching_requests );
			return $result;
		}

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

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

		list( $route, $handler ) = $matched;

		if ( ! is_callable( $handler[&#039;callback&#039;] ) ) {
			$error = new WP_Error(
				&#039;rest_invalid_handler&#039;,
				__( &#039;The handler for the route is invalid.&#039; ),
				array( &#039;status&#039; =&gt; 500 )
			);
		}

		if ( ! is_wp_error( $error ) ) {
			$check_required = $request-&gt;has_valid_params();
			if ( is_wp_error( $check_required ) ) {
				$error = $check_required;
			} else {
				$check_sanitized = $request-&gt;sanitize_params();
				if ( is_wp_error( $check_sanitized ) ) {
					$error = $check_sanitized;
				}
			}
		}

		$response = $this-&gt;respond_to_request( $request, $route, $handler, $error );
		array_pop( $this-&gt;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-&gt;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-&gt;get_method();
		$path   = $request-&gt;get_route();

		$with_namespace = array();

		foreach ( $this-&gt;get_namespaces() as $namespace ) {
			if ( str_starts_with( trailingslashit( ltrim( $path, &#039;/&#039; ) ), $namespace ) ) {
				$with_namespace[] = $this-&gt;get_routes( $namespace );
			}
		}

		if ( $with_namespace ) {
			$routes = array_merge( ...$with_namespace );
		} else {
			$routes = $this-&gt;get_routes();
		}

		foreach ( $routes as $route =&gt; $handlers ) {
			$match = preg_match( &#039;@^&#039; . $route . &#039;$@i&#039;, $path, $matches );

			if ( ! $match ) {
				continue;
			}

			$args = array();

			foreach ( $matches as $param =&gt; $value ) {
				if ( ! is_int( $param ) ) {
					$args[ $param ] = $value;
				}
			}

			foreach ( $handlers as $handler ) {
				$callback = $handler[&#039;callback&#039;];

				// Fallback to GET method if no HEAD method is registered.
				$checked_method = $method;
				if ( &#039;HEAD&#039; === $method &amp;&amp; empty( $handler[&#039;methods&#039;][&#039;HEAD&#039;] ) ) {
					$checked_method = &#039;GET&#039;;
				}
				if ( empty( $handler[&#039;methods&#039;][ $checked_method ] ) ) {
					continue;
				}

				if ( ! is_callable( $callback ) ) {
					return array( $route, $handler );
				}

				$request-&gt;set_url_params( $args );
				$request-&gt;set_attributes( $handler );

				$defaults = array();

				foreach ( $handler[&#039;args&#039;] as $arg =&gt; $options ) {
					if ( isset( $options[&#039;default&#039;] ) ) {
						$defaults[ $arg ] = $options[&#039;default&#039;];
					}
				}

				$request-&gt;set_default_params( $defaults );

				return array( $route, $handler );
			}
		}

		return new WP_Error(
			&#039;rest_no_route&#039;,
			__( &#039;No route was found matching the URL and request method.&#039; ),
			array( &#039;status&#039; =&gt; 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( &#039;rest_request_before_callbacks&#039;, $response, $handler, $request );

		// Check permission specified on the route.
		if ( ! is_wp_error( $response ) &amp;&amp; ! empty( $handler[&#039;permission_callback&#039;] ) ) {
			$permission = call_user_func( $handler[&#039;permission_callback&#039;], $request );

			if ( is_wp_error( $permission ) ) {
				$response = $permission;
			} elseif ( false === $permission || null === $permission ) {
				$response = new WP_Error(
					&#039;rest_forbidden&#039;,
					__( &#039;Sorry, you are not allowed to do that.&#039; ),
					array( &#039;status&#039; =&gt; 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( &#039;rest_dispatch_request&#039;, 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[&#039;callback&#039;], $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 &#039;rest_request_before_callbacks&#039;}
		 * 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&#039;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( &#039;rest_request_after_callbacks&#039;, $response, $handler, $request );

		if ( is_wp_error( $response ) ) {
			$response = $this-&gt;error_to_response( $response );
		} else {
			$response = rest_ensure_response( $response );
		}

		$response-&gt;set_matched_route( $route );
		$response-&gt;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
	 * &quot;Encoding error: Maximum stack depth exceeded&quot;.
	 *
	 * @since 4.4.0
	 *
	 * @return false|string Boolean false or string error message.
	 */
	protected function get_json_last_error() {
		if ( JSON_ERROR_NONE === json_last_error() ) {
			return false;
		}

		return json_last_error_msg();
	}

	/**
	 * Retrieves the site index.
	 *
	 * This endpoint describes the capabilities of the site.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_REST_Request $request Request data.
	 * @return WP_REST_Response The API root index data.
	 */
	public function get_index( $request ) {
		// General site data.
		$available = array(
			&#039;name&#039;            =&gt; get_option( &#039;blogname&#039; ),
			&#039;description&#039;     =&gt; get_option( &#039;blogdescription&#039; ),
			&#039;url&#039;             =&gt; get_option( &#039;siteurl&#039; ),
			&#039;home&#039;            =&gt; home_url(),
			&#039;gmt_offset&#039;      =&gt; get_option( &#039;gmt_offset&#039; ),
			&#039;timezone_string&#039; =&gt; get_option( &#039;timezone_string&#039; ),
			&#039;page_for_posts&#039;  =&gt; (int) get_option( &#039;page_for_posts&#039; ),
			&#039;page_on_front&#039;   =&gt; (int) get_option( &#039;page_on_front&#039; ),
			&#039;show_on_front&#039;   =&gt; get_option( &#039;show_on_front&#039; ),
			&#039;namespaces&#039;      =&gt; array_keys( $this-&gt;namespaces ),
			&#039;authentication&#039;  =&gt; array(),
			&#039;routes&#039;          =&gt; $this-&gt;get_data_for_routes( $this-&gt;get_routes(), $request[&#039;context&#039;] ),
		);

		$response = new WP_REST_Response( $available );

		$fields = isset( $request[&#039;_fields&#039;] ) ? $request[&#039;_fields&#039;] : &#039;&#039;;
		$fields = wp_parse_list( $fields );
		if ( empty( $fields ) ) {
			$fields[] = &#039;_links&#039;;
		}

		if ( $request-&gt;has_param( &#039;_embed&#039; ) ) {
			$fields[] = &#039;_embedded&#039;;
		}

		if ( rest_is_field_included( &#039;_links&#039;, $fields ) || rest_is_field_included( &#039;_embedded&#039;, $fields ) ) {
			$response-&gt;add_link( &#039;help&#039;, &#039;https://developer.wordpress.org/rest-api/&#039; );
			$this-&gt;add_active_theme_link_to_index( $response );
			$this-&gt;add_site_logo_to_index( $response );
			$this-&gt;add_site_icon_to_index( $response );
		} else {
			if ( rest_is_field_included( &#039;site_logo&#039;, $fields ) ) {
				$this-&gt;add_site_logo_to_index( $response );
			}
			if ( rest_is_field_included( &#039;site_icon&#039;, $fields ) || rest_is_field_included( &#039;site_icon_url&#039;, $fields ) ) {
				$this-&gt;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( &#039;rest_index&#039;, $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( &#039;switch_themes&#039; ) || current_user_can( &#039;manage_network_themes&#039; );

		if ( ! $should_add &amp;&amp; current_user_can( &#039;edit_posts&#039; ) ) {
			$should_add = true;
		}

		if ( ! $should_add ) {
			foreach ( get_post_types( array( &#039;show_in_rest&#039; =&gt; true ), &#039;objects&#039; ) as $post_type ) {
				if ( current_user_can( $post_type-&gt;cap-&gt;edit_posts ) ) {
					$should_add = true;
					break;
				}
			}
		}

		if ( $should_add ) {
			$theme = wp_get_theme();
			$response-&gt;add_link( &#039;https://api.w.org/active-theme&#039;, rest_url( &#039;wp/v2/themes/&#039; . $theme-&gt;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( &#039;custom_logo&#039;, 0 );

		$this-&gt;add_image_to_index( $response, $site_logo_id, &#039;site_logo&#039; );
	}

	/**
	 * 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( &#039;site_icon&#039;, 0 );

		$this-&gt;add_image_to_index( $response, $site_icon_id, &#039;site_icon&#039; );

		$response-&gt;data[&#039;site_icon_url&#039;] = 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-&gt;data[ $type ] = (int) $image_id;
		if ( $image_id ) {
			$response-&gt;add_link(
				&#039;https://api.w.org/featuredmedia&#039;,
				rest_url( rest_get_route_for_post( $image_id ) ),
				array(
					&#039;embeddable&#039; =&gt; true,
					&#039;type&#039;       =&gt; $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&#039;t set.
	 */
	public function get_namespace_index( $request ) {
		$namespace = $request[&#039;namespace&#039;];

		if ( ! isset( $this-&gt;namespaces[ $namespace ] ) ) {
			return new WP_Error(
				&#039;rest_invalid_namespace&#039;,
				__( &#039;The specified namespace could not be found.&#039; ),
				array( &#039;status&#039; =&gt; 404 )
			);
		}

		$routes    = $this-&gt;namespaces[ $namespace ];
		$endpoints = array_intersect_key( $this-&gt;get_routes(), $routes );

		$data     = array(
			&#039;namespace&#039; =&gt; $namespace,
			&#039;routes&#039;    =&gt; $this-&gt;get_data_for_routes( $endpoints, $request[&#039;context&#039;] ),
		);
		$response = rest_ensure_response( $data );

		// Link to the root index.
		$response-&gt;add_link( &#039;up&#039;, rest_url( &#039;/&#039; ) );

		/**
		 * Filters the REST API namespace index data.
		 *
		 * This typically is just the route data for the namespace, but you can
		 * add any data you&#039;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 &#039;namespace&#039; parameter.
		 */
		return apply_filters( &#039;rest_namespace_index&#039;, $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 &#039;view&#039; or &#039;help&#039;. Default &#039;view&#039;.
	 * @return array[] Route data to expose in indexes, keyed by route.
	 */
	public function get_data_for_routes( $routes, $context = &#039;view&#039; ) {
		$available = array();

		// Find the available routes.
		foreach ( $routes as $route =&gt; $callbacks ) {
			$data = $this-&gt;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( &#039;rest_endpoints_description&#039;, $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( &#039;rest_route_data&#039;, $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 &#039;view&#039; or &#039;help&#039;. Default &#039;view&#039;.
	 * @return array|null Data for the route, or null if no publicly-visible data.
	 */
	public function get_data_for_route( $route, $callbacks, $context = &#039;view&#039; ) {
		$data = array(
			&#039;namespace&#039; =&gt; &#039;&#039;,
			&#039;methods&#039;   =&gt; array(),
			&#039;endpoints&#039; =&gt; array(),
		);

		$allow_batch = false;

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

			if ( isset( $options[&#039;namespace&#039;] ) ) {
				$data[&#039;namespace&#039;] = $options[&#039;namespace&#039;];
			}

			$allow_batch = isset( $options[&#039;allow_batch&#039;] ) ? $options[&#039;allow_batch&#039;] : false;

			if ( isset( $options[&#039;schema&#039;] ) &amp;&amp; &#039;help&#039; === $context ) {
				$data[&#039;schema&#039;] = call_user_func( $options[&#039;schema&#039;] );
			}
		}

		$allowed_schema_keywords = array_flip( rest_get_allowed_schema_keywords() );

		$route = preg_replace( &#039;#\(\?P&lt;(\w+?)&gt;.*?\)#&#039;, &#039;{$1}&#039;, $route );

		foreach ( $callbacks as $callback ) {
			// Skip to the next route if any callback is hidden.
			if ( empty( $callback[&#039;show_in_index&#039;] ) ) {
				continue;
			}

			$data[&#039;methods&#039;] = array_merge( $data[&#039;methods&#039;], array_keys( $callback[&#039;methods&#039;] ) );
			$endpoint_data   = array(
				&#039;methods&#039; =&gt; array_keys( $callback[&#039;methods&#039;] ),
			);

			$callback_batch = isset( $callback[&#039;allow_batch&#039;] ) ? $callback[&#039;allow_batch&#039;] : $allow_batch;

			if ( $callback_batch ) {
				$endpoint_data[&#039;allow_batch&#039;] = $callback_batch;
			}

			if ( isset( $callback[&#039;args&#039;] ) ) {
				$endpoint_data[&#039;args&#039;] = array();

				foreach ( $callback[&#039;args&#039;] as $key =&gt; $opts ) {
					if ( is_string( $opts ) ) {
						$opts = array( $opts =&gt; 0 );
					} elseif ( ! is_array( $opts ) ) {
						$opts = array();
					}
					$arg_data             = array_intersect_key( $opts, $allowed_schema_keywords );
					$arg_data[&#039;required&#039;] = ! empty( $opts[&#039;required&#039;] );

					$endpoint_data[&#039;args&#039;][ $key ] = $arg_data;
				}
			}

			$data[&#039;endpoints&#039;][] = $endpoint_data;

			// For non-variable routes, generate links.
			if ( ! str_contains( $route, &#039;{&#039; ) ) {
				$data[&#039;_links&#039;] = array(
					&#039;self&#039; =&gt; array(
						array(
							&#039;href&#039; =&gt; rest_url( $route ),
						),
					),
				);
			}
		}

		if ( empty( $data[&#039;methods&#039;] ) ) {
			// 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( &#039;rest_get_max_batch_size&#039;, 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[&#039;requests&#039;] as $args ) {
			$parsed_url = wp_parse_url( $args[&#039;path&#039;] );

			if ( false === $parsed_url ) {
				$requests[] = new WP_Error( &#039;parse_path_failed&#039;, __( &#039;Could not parse the path.&#039; ), array( &#039;status&#039; =&gt; 400 ) );

				continue;
			}

			$single_request = new WP_REST_Request( isset( $args[&#039;method&#039;] ) ? $args[&#039;method&#039;] : &#039;POST&#039;, $parsed_url[&#039;path&#039;] );

			if ( ! empty( $parsed_url[&#039;query&#039;] ) ) {
				$query_args = array();
				wp_parse_str( $parsed_url[&#039;query&#039;], $query_args );
				$single_request-&gt;set_query_params( $query_args );
			}

			if ( ! empty( $args[&#039;body&#039;] ) ) {
				$single_request-&gt;set_body_params( $args[&#039;body&#039;] );
			}

			if ( ! empty( $args[&#039;headers&#039;] ) ) {
				$single_request-&gt;set_headers( $args[&#039;headers&#039;] );
			}

			$requests[] = $single_request;
		}

		$matches    = array();
		$validation = array();
		$has_error  = false;

		foreach ( $requests as $single_request ) {
			if ( is_wp_error( $single_request ) ) {
				$has_error    = true;
				$validation[] = $single_request;
				continue;
			}

			$match     = $this-&gt;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[&#039;allow_batch&#039;] ) ) {
					$allow_batch = $handler[&#039;allow_batch&#039;];
				} else {
					$route_options = $this-&gt;get_route_options( $route );
					$allow_batch   = isset( $route_options[&#039;allow_batch&#039;] ) ? $route_options[&#039;allow_batch&#039;] : false;
				}

				if ( ! is_array( $allow_batch ) || empty( $allow_batch[&#039;v1&#039;] ) ) {
					$error = new WP_Error(
						&#039;rest_batch_not_allowed&#039;,
						__( &#039;The requested route does not support batch requests.&#039; ),
						array( &#039;status&#039; =&gt; 400 )
					);
				}
			}

			if ( ! $error ) {
				$check_required = $single_request-&gt;has_valid_params();
				if ( is_wp_error( $check_required ) ) {
					$error = $check_required;
				}
			}

			if ( ! $error ) {
				$check_sanitized = $single_request-&gt;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 &amp;&amp; &#039;require-all-validate&#039; === $batch_request[&#039;validation&#039;] ) {
			foreach ( $validation as $valid ) {
				if ( is_wp_error( $valid ) ) {
					$responses[] = $this-&gt;envelope_response( $this-&gt;error_to_response( $valid ), false )-&gt;get_data();
				} else {
					$responses[] = null;
				}
			}

			return new WP_REST_Response(
				array(
					&#039;failed&#039;    =&gt; &#039;validation&#039;,
					&#039;responses&#039; =&gt; $responses,
				),
				WP_Http::MULTI_STATUS
			);
		}

		foreach ( $requests as $i =&gt; $single_request ) {
			if ( is_wp_error( $single_request ) ) {
				$result      = $this-&gt;error_to_response( $single_request );
				$responses[] = $this-&gt;envelope_response( $result, false )-&gt;get_data();
				continue;
			}

			$clean_request = clone $single_request;
			$clean_request-&gt;set_url_params( array() );
			$clean_request-&gt;set_attributes( array() );
			$clean_request-&gt;set_default_params( array() );

			/** This filter is documented in wp-includes/rest-api/class-wp-rest-server.php */
			$result = apply_filters( &#039;rest_pre_dispatch&#039;, 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-&gt;error_to_response( $match );
				} else {
					list( $route, $handler ) = $match;

					if ( ! $error &amp;&amp; ! is_callable( $handler[&#039;callback&#039;] ) ) {
						$error = new WP_Error(
							&#039;rest_invalid_handler&#039;,
							__( &#039;The handler for the route is invalid&#039; ),
							array( &#039;status&#039; =&gt; 500 )
						);
					}

					$result = $this-&gt;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( &#039;rest_post_dispatch&#039;, rest_ensure_response( $result ), $this, $single_request );

			$responses[] = $this-&gt;envelope_response( $result, false )-&gt;get_data();
		}

		return new WP_REST_Response( array( &#039;responses&#039; =&gt; $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( &#039;/\s+/&#039;, &#039; &#039;, $value );
		header( sprintf( &#039;%s: %s&#039;, $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 =&gt; $value ) {
			$this-&gt;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( &#039;php://input&#039; );
		}

		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(
			&#039;CONTENT_LENGTH&#039; =&gt; true,
			&#039;CONTENT_MD5&#039;    =&gt; true,
			&#039;CONTENT_TYPE&#039;   =&gt; true,
		);

		foreach ( $server as $key =&gt; $value ) {
			if ( str_starts_with( $key, &#039;HTTP_&#039; ) ) {
				$headers[ substr( $key, 5 ) ] = $value;
			} elseif ( &#039;REDIRECT_HTTP_AUTHORIZATION&#039; === $key &amp;&amp; empty( $server[&#039;HTTP_AUTHORIZATION&#039;] ) ) {
				/*
				 * 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[&#039;AUTHORIZATION&#039;] = $value;
			} elseif ( isset( $additional[ $key ] ) ) {
				$headers[ $key ] = $value;
			}
		}

		return $headers;
	}
}
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