(WIP) Add a new endpoint that exposes block editor settings through the REST API

lib/class-wp-rest-block-editor-settings-controller.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * REST API: WP_REST_Block_Editor_Settings_Controller class
+ *
+ * @package    WordPress
+ * @subpackage REST_API
+ */
+
+/**
+ * Core class used to retrieve block editor settings via the REST API.
+ *
+ * @see WP_REST_Controller
+ */
+class WP_REST_Block_Editor_Settings_Controller extends WP_REST_Controller {
+	/**
+	 * Constructs the controller.
+	 */
+	public function __construct() {
+		$this->namespace = 'wp/v2';
+		$this->rest_base = 'block-editor-settings';
+	}
+
+	/**
+	 * Registers the necessary REST API routes.
+	 */
+	public function register_routes() {
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base,
+			array(
+				array(
+					'methods'             => WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_items' ),
+					'permission_callback' => array( $this, 'get_items_permissions_check' ),
+				),
+			)
+		);
+	}
+
+	/**
+	 * Checks whether a given request has permission to read block editor settings
+	 *
+	 * @return WP_Error|bool True if the request has permission, WP_Error object otherwise.
+	 */
+	public function get_items_permissions_check() {
+		if ( ! current_user_can( 'edit_posts' ) ) {
+			$error = __( 'Sorry, you are not allowed to read the block editor settings.', 'gutenberg' );
+			return new WP_Error( 'rest_cannot_read_settings', $error, array( 'status' => rest_authorization_required_code() ) );
+		}
+
+		return true;
+	}
+
+	/**
+	 * Return all block editor settings
+	 *
+	 * @return WP_Error|WP_REST_Response Response object on success, or WP_Error object on failure.
+	 */
+	public function get_items() {
+		$settings = apply_filters( 'block_editor_settings', array() );
+
+		return rest_ensure_response( $settings );
+	}
+}

lib/global-styles.php

@@ -209,6 +209,8 @@ function gutenberg_experimental_global_styles_settings( $settings ) {
 		$origin = 'user';
 	}
 	$tree = WP_Theme_JSON_Resolver::get_merged_data( $theme_support_data, $origin );
+	// Check for mobile editor.
+	$is_mobile = isset( $_REQUEST['is_mobile'] ) && 'true' === $_REQUEST['is_mobile'];
 
 	// STEP 1: ADD FEATURES
 	//
@@ -223,11 +225,12 @@ function gutenberg_experimental_global_styles_settings( $settings ) {
 	// In the site editor, the user can change styles, so the client
 	// needs the ability to create them. Hence, we pass it some data
 	// for this: base styles (core+theme) and the ID of the user CPT.
-	$screen = get_current_screen();
+	$screen = ! $is_mobile && get_current_screen();
 	if (
-		! empty( $screen ) &&
+		( ( ! empty( $screen ) &&
 		function_exists( 'gutenberg_is_edit_site_page' ) &&
-		gutenberg_is_edit_site_page( $screen->id ) &&
+		gutenberg_is_edit_site_page( $screen->id ) ||
+		$is_mobile ) ) &&
 		WP_Theme_JSON_Resolver::theme_has_support() &&
 		gutenberg_is_fse_theme()
 	) {

lib/load.php

@@ -67,6 +67,9 @@ function gutenberg_is_experiment_enabled( $name ) {
 	if ( ! class_exists( 'WP_REST_Templates_Controller' ) ) {
 		require_once __DIR__ . '/full-site-editing/class-wp-rest-templates-controller.php';
 	}
+	if ( ! class_exists( 'WP_REST_Block_Editor_Settings_Controller' ) ) {
+		require dirname( __FILE__ ) . '/class-wp-rest-block-editor-settings-controller.php';
+	}
 	/**
 	* End: Include for phase 2
 	*/

lib/rest-api.php

@@ -73,6 +73,15 @@ function gutenberg_register_batch_endpoint() {
 }
 add_action( 'rest_api_init', 'gutenberg_register_batch_endpoint' );
 
+/**
+ * Registers the Block types REST API routes.
+ */
+function gutenberg_register_rest_block_editor_settings() {
+	$editor_settings = new WP_REST_Block_Editor_Settings_Controller();
+	$editor_settings->register_routes();
+}
+add_action( 'rest_api_init', 'gutenberg_register_rest_block_editor_settings' );
+
 /**
  * Hook in to the nav menu item post type and enable a post type rest endpoint.
  *