diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/rest-api/endpoints/class-wp-rest-template-autosaves-controller.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/rest-api/endpoints/class-wp-rest-template-autosaves-controller.php	Fri Sep 05 18:40:08 2025 +0200
@@ -0,0 +1,276 @@
+<?php
+/**
+ * REST API: WP_REST_Template_Autosaves_Controller class.
+ *
+ * @package WordPress
+ * @subpackage REST_API
+ * @since 6.4.0
+ */
+
+/**
+ * Core class used to access template autosaves via the REST API.
+ *
+ * @since 6.4.0
+ *
+ * @see WP_REST_Autosaves_Controller
+ */
+class WP_REST_Template_Autosaves_Controller extends WP_REST_Autosaves_Controller {
+	/**
+	 * Parent post type.
+	 *
+	 * @since 6.4.0
+	 * @var string
+	 */
+	private $parent_post_type;
+
+	/**
+	 * Parent post controller.
+	 *
+	 * @since 6.4.0
+	 * @var WP_REST_Controller
+	 */
+	private $parent_controller;
+
+	/**
+	 * Revision controller.
+	 *
+	 * @since 6.4.0
+	 * @var WP_REST_Revisions_Controller
+	 */
+	private $revisions_controller;
+
+	/**
+	 * The base of the parent controller's route.
+	 *
+	 * @since 6.4.0
+	 * @var string
+	 */
+	private $parent_base;
+
+	/**
+	 * Constructor.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param string $parent_post_type Post type of the parent.
+	 */
+	public function __construct( $parent_post_type ) {
+		parent::__construct( $parent_post_type );
+		$this->parent_post_type = $parent_post_type;
+		$post_type_object       = get_post_type_object( $parent_post_type );
+		$parent_controller      = $post_type_object->get_rest_controller();
+
+		if ( ! $parent_controller ) {
+			$parent_controller = new WP_REST_Templates_Controller( $parent_post_type );
+		}
+
+		$this->parent_controller = $parent_controller;
+
+		$revisions_controller = $post_type_object->get_revisions_rest_controller();
+		if ( ! $revisions_controller ) {
+			$revisions_controller = new WP_REST_Revisions_Controller( $parent_post_type );
+		}
+		$this->revisions_controller = $revisions_controller;
+		$this->rest_base            = 'autosaves';
+		$this->parent_base          = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;
+		$this->namespace            = ! empty( $post_type_object->rest_namespace ) ? $post_type_object->rest_namespace : 'wp/v2';
+	}
+
+	/**
+	 * Registers the routes for autosaves.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @see register_rest_route()
+	 */
+	public function register_routes() {
+		register_rest_route(
+			$this->namespace,
+			sprintf(
+				'/%s/(?P<id>%s%s)/%s',
+				$this->parent_base,
+				/*
+				 * Matches theme's directory: `/themes/<subdirectory>/<theme>/` or `/themes/<theme>/`.
+				 * Excludes invalid directory name characters: `/:<>*?"|`.
+				 */
+				'([^\/:<>\*\?"\|]+(?:\/[^\/:<>\*\?"\|]+)?)',
+				// Matches the template name.
+				'[\/\w%-]+',
+				$this->rest_base
+			),
+			array(
+				'args'   => array(
+					'id' => array(
+						'description'       => __( 'The id of a template' ),
+						'type'              => 'string',
+						'sanitize_callback' => array( $this->parent_controller, '_sanitize_template_id' ),
+					),
+				),
+				array(
+					'methods'             => WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_items' ),
+					'permission_callback' => array( $this, 'get_items_permissions_check' ),
+					'args'                => $this->get_collection_params(),
+				),
+				array(
+					'methods'             => WP_REST_Server::CREATABLE,
+					'callback'            => array( $this, 'create_item' ),
+					'permission_callback' => array( $this, 'create_item_permissions_check' ),
+					'args'                => $this->parent_controller->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
+				),
+				'schema' => array( $this, 'get_public_item_schema' ),
+			)
+		);
+
+		register_rest_route(
+			$this->namespace,
+			sprintf(
+				'/%s/(?P<parent>%s%s)/%s/%s',
+				$this->parent_base,
+				/*
+				 * Matches theme's directory: `/themes/<subdirectory>/<theme>/` or `/themes/<theme>/`.
+				 * Excludes invalid directory name characters: `/:<>*?"|`.
+				 */
+				'([^\/:<>\*\?"\|]+(?:\/[^\/:<>\*\?"\|]+)?)',
+				// Matches the template name.
+				'[\/\w%-]+',
+				$this->rest_base,
+				'(?P<id>[\d]+)'
+			),
+			array(
+				'args'   => array(
+					'parent' => array(
+						'description'       => __( 'The id of a template' ),
+						'type'              => 'string',
+						'sanitize_callback' => array( $this->parent_controller, '_sanitize_template_id' ),
+					),
+					'id'     => array(
+						'description' => __( 'The ID for the autosave.' ),
+						'type'        => 'integer',
+					),
+				),
+				array(
+					'methods'             => WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_item' ),
+					'permission_callback' => array( $this->revisions_controller, 'get_item_permissions_check' ),
+					'args'                => array(
+						'context' => $this->get_context_param( array( 'default' => 'view' ) ),
+					),
+				),
+				'schema' => array( $this, 'get_public_item_schema' ),
+			)
+		);
+	}
+
+	/**
+	 * Prepares the item for the REST response.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param WP_Post         $item    Post revision object.
+	 * @param WP_REST_Request $request Request object.
+	 * @return WP_REST_Response Response object.
+	 */
+	public function prepare_item_for_response( $item, $request ) {
+		$template = _build_block_template_result_from_post( $item );
+		$response = $this->parent_controller->prepare_item_for_response( $template, $request );
+
+		$fields = $this->get_fields_for_response( $request );
+		$data   = $response->get_data();
+
+		if ( in_array( 'parent', $fields, true ) ) {
+			$data['parent'] = (int) $item->post_parent;
+		}
+
+		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
+		$data    = $this->filter_response_by_context( $data, $context );
+
+		// Wrap the data in a response object.
+		$response = new WP_REST_Response( $data );
+
+		if ( rest_is_field_included( '_links', $fields ) || rest_is_field_included( '_embedded', $fields ) ) {
+			$links = $this->prepare_links( $template );
+			$response->add_links( $links );
+		}
+
+		return $response;
+	}
+
+	/**
+	 * Gets the autosave, if the ID is valid.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return WP_Post|WP_Error Autosave post object if ID is valid, WP_Error otherwise.
+	 */
+	public function get_item( $request ) {
+		$parent = $this->get_parent( $request['parent'] );
+		if ( is_wp_error( $parent ) ) {
+			return $parent;
+		}
+
+		$autosave = wp_get_post_autosave( $parent->ID );
+
+		if ( ! $autosave ) {
+			return new WP_Error(
+				'rest_post_no_autosave',
+				__( 'There is no autosave revision for this template.' ),
+				array( 'status' => 404 )
+			);
+		}
+
+		$response = $this->prepare_item_for_response( $autosave, $request );
+		return $response;
+	}
+
+	/**
+	 * Get the parent post.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param int $parent_id Supplied ID.
+	 * @return WP_Post|WP_Error Post object if ID is valid, WP_Error otherwise.
+	 */
+	protected function get_parent( $parent_id ) {
+		return $this->revisions_controller->get_parent( $parent_id );
+	}
+
+	/**
+	 * Prepares links for the request.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param WP_Block_Template $template Template.
+	 * @return array Links for the given post.
+	 */
+	protected function prepare_links( $template ) {
+		$links = array(
+			'self'   => array(
+				'href' => rest_url( sprintf( '/%s/%s/%s/%s/%d', $this->namespace, $this->parent_base, $template->id, $this->rest_base, $template->wp_id ) ),
+			),
+			'parent' => array(
+				'href' => rest_url( sprintf( '/%s/%s/%s', $this->namespace, $this->parent_base, $template->id ) ),
+			),
+		);
+
+		return $links;
+	}
+
+	/**
+	 * Retrieves the autosave's schema, conforming to JSON Schema.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @return array Item schema data.
+	 */
+	public function get_item_schema() {
+		if ( $this->schema ) {
+			return $this->add_additional_fields_schema( $this->schema );
+		}
+
+		$this->schema = $this->revisions_controller->get_item_schema();
+
+		return $this->add_additional_fields_schema( $this->schema );
+	}
+}