REST API: Add route for single styles revisions.

Adds a route for single global styles revisions: /wp/v2/global-styles/${ parentId }/revisions/${ revisionsId }
This fixes the `getRevision` actions in the core-data package.

Props ramonopoly, get_dave.
Fixes #59810.
Built from https://develop.svn.wordpress.org/trunk@57494


git-svn-id: http://core.svn.wordpress.org/trunk@56995 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-global-styles-revisions-controller.php

@@ -47,6 +47,7 @@ class WP_REST_Global_Styles_Revisions_Controller extends WP_REST_Controller {
 	 * Registers the controller's routes.
 	 *
 	 * @since 6.3.0
+	 * @since 6.5.0 Added route to fetch individual global styles revisions.
 	 */
 	public function register_routes() {
 		register_rest_route(
@@ -68,6 +69,32 @@ class WP_REST_Global_Styles_Revisions_Controller extends WP_REST_Controller {
 				'schema' => array( $this, 'get_public_item_schema' ),
 			)
 		);
+
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base . '/(?P<id>[\d]+)',
+			array(
+				'args'   => array(
+					'parent' => array(
+						'description' => __( 'The ID for the parent of the global styles revision.' ),
+						'type'        => 'integer',
+					),
+					'id'     => array(
+						'description' => __( 'Unique identifier for the global styles revision.' ),
+						'type'        => 'integer',
+					),
+				),
+				array(
+					'methods'             => WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_item' ),
+					'permission_callback' => array( $this, 'get_item_permissions_check' ),
+					'args'                => array(
+						'context' => $this->get_context_param( array( 'default' => 'view' ) ),
+					),
+				),
+				'schema' => array( $this, 'get_public_item_schema' ),
+			)
+		);
 	}
 
 	/**
@@ -241,6 +268,56 @@ class WP_REST_Global_Styles_Revisions_Controller extends WP_REST_Controller {
 		return $response;
 	}
 
+	/**
+	 * Retrieves one global styles revision from the collection.
+	 *
+	 * @since 6.5.0
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
+	 */
+	public function get_item( $request ) {
+		$parent = $this->get_parent( $request['parent'] );
+		if ( is_wp_error( $parent ) ) {
+			return $parent;
+		}
+
+		$revision = $this->get_revision( $request['id'] );
+		if ( is_wp_error( $revision ) ) {
+			return $revision;
+		}
+
+		$response = $this->prepare_item_for_response( $revision, $request );
+		return rest_ensure_response( $response );
+	}
+
+	/**
+	 * Gets the global styles revision, if the ID is valid.
+	 *
+	 * @since 6.5.0
+	 *
+	 * @param int $id Supplied ID.
+	 * @return WP_Post|WP_Error Revision post object if ID is valid, WP_Error otherwise.
+	 */
+	protected function get_revision( $id ) {
+		$error = new WP_Error(
+			'rest_post_invalid_id',
+			__( 'Invalid global styles revision ID.' ),
+			array( 'status' => 404 )
+		);
+
+		if ( (int) $id <= 0 ) {
+			return $error;
+		}
+
+		$revision = get_post( (int) $id );
+		if ( empty( $revision ) || empty( $revision->ID ) || 'revision' !== $revision->post_type ) {
+			return $error;
+		}
+
+		return $revision;
+	}
+
 	/**
 	 * Checks the post_date_gmt or modified_gmt and prepare any post or
 	 * modified date for single post output.

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57493';
+$wp_version = '6.5-alpha-57494';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.