[Global Styles]: Add REST API endpoint to fetch variations

lib/compat/wordpress-6.0/class-gutenberg-rest-global-styles-controller.php

@@ -0,0 +1,96 @@
+<?php
+/**
+ * REST API: Gutenberg_REST_Global_Styles_Controller class
+ *
+ * @package    Gutenberg
+ * @subpackage REST_API
+ */
+
+/**
+ * Base Global Styles REST API Controller.
+ */
+class Gutenberg_REST_Global_Styles_Controller extends WP_REST_Global_Styles_Controller {
+	/**
+	 * Registers the controllers routes.
+	 *
+	 * @return void
+	 */
+	public function register_routes() {
+		// List themes global styles.
+		register_rest_route(
+			$this->namespace,
+			'/' . $this->rest_base . '/themes/(?P<stylesheet>[\/\s%\w\.\(\)\[\]\@_\-]+)/variations',
+			array(
+				array(
+					'methods'             => WP_REST_Server::READABLE,
+					'callback'            => array( $this, 'get_theme_items' ),
+					'permission_callback' => array( $this, 'get_theme_items_permissions_check' ),
+					'args'                => array(
+						'stylesheet' => array(
+							'description' => __( 'The theme identifier', 'gutenberg' ),
+							'type'        => 'string',
+						),
+					),
+				),
+			)
+		);
+
+		parent::register_routes();
+	}
+
+	/**
+	 * Checks if a given request has access to read a single theme global styles config.
+	 *
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return true|WP_Error True if the request has read access for the item, WP_Error object otherwise.
+	 */
+	public function get_theme_items_permissions_check( $request ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
+		// Verify if the current user has edit_theme_options capability.
+		// This capability is required to edit/view/delete templates.
+		if ( ! current_user_can( 'edit_theme_options' ) ) {
+			return new WP_Error(
+				'rest_cannot_manage_global_styles',
+				__( 'Sorry, you are not allowed to access the global styles on this site.', 'gutenberg' ),
+				array(
+					'status' => rest_authorization_required_code(),
+				)
+			);
+		}
+
+		return true;
+	}
+
+	/**
+	 * Returns the given theme global styles variations.
+	 *
+	 * @param WP_REST_Request $request The request instance.
+	 *
+	 * @return WP_REST_Response|WP_Error
+	 */
+	public function get_theme_items( $request ) {
+		if ( wp_get_theme()->get_stylesheet() !== $request['stylesheet'] ) {
+			// This endpoint only supports the active theme for now.
+			return new WP_Error(
+				'rest_theme_not_found',
+				__( 'Theme not found.', 'gutenberg' ),
+				array( 'status' => 404 )
+			);
+		}
+
+		$variations     = array();
+		$base_directory = get_stylesheet_directory() . '/styles';
+		if ( is_dir( $base_directory ) ) {
+			$nested_files      = new RecursiveIteratorIterator( new RecursiveDirectoryIterator( $base_directory ) );
+			$nested_html_files = new RegexIterator( $nested_files, '/^.+\.json$/i', RecursiveRegexIterator::GET_MATCH );
+			foreach ( $nested_html_files as $path => $file ) {
+				$decoded_file = wp_json_file_decode( $path, array( 'associative' => true ) );
+				if ( is_array( $decoded_file ) ) {
+					$variations[] = ( new WP_Theme_JSON_Gutenberg( $decoded_file ) )->get_raw_data();
+				}
+			}
+		}
+		$response = rest_ensure_response( $variations );
+
+		return $response;
+	}
+}

lib/compat/wordpress-6.0/rest-api.php

@@ -0,0 +1,15 @@
+<?php
+/**
+ * Overrides Core's wp-includes/rest-api.php and registers the new endpoint for WP 6.0.
+ *
+ * @package gutenberg
+ */
+
+/**
+ * Registers the Global Styles REST API routes.
+ */
+function gutenberg_register_global_styles_endpoints() {
+	$editor_settings = new Gutenberg_REST_Global_Styles_Controller();
+	$editor_settings->register_routes();
+}
+add_action( 'rest_api_init', 'gutenberg_register_global_styles_endpoints' );

lib/load.php

@@ -123,11 +123,13 @@ function gutenberg_is_experiment_enabled( $name ) {
 require __DIR__ . '/compat/wordpress-5.9/block-template.php';
 require __DIR__ . '/compat/wordpress-5.9/wp-theme-get-post-templates.php';
 require __DIR__ . '/compat/wordpress-5.9/default-theme-supports.php';
-require __DIR__ . '/compat/wordpress-5.9/class-gutenberg-rest-global-styles-controller.php';
+require __DIR__ . '/compat/wordpress-5.9/class-wp-rest-global-styles-controller.php';
 require __DIR__ . '/compat/wordpress-5.9/rest-active-global-styles.php';
 require __DIR__ . '/compat/wordpress-5.9/move-theme-editor-menu-item.php';
 require __DIR__ . '/compat/wordpress-6.0/post-lock.php';
 require __DIR__ . '/compat/wordpress-6.0/blocks.php';
+require __DIR__ . '/compat/wordpress-6.0/class-gutenberg-rest-global-styles-controller.php';
+require __DIR__ . '/compat/wordpress-6.0/rest-api.php';
 require __DIR__ . '/compat/experimental/blocks.php';
 
 require __DIR__ . '/blocks.php';

lib/rest-api.php

@@ -234,15 +234,6 @@ function gutenberg_rest_user_collection_params_has_published_posts( $query_param
 }
 add_filter( 'rest_user_collection_params', 'gutenberg_rest_user_collection_params_has_published_posts' );
 
-/**
- * Registers the Global Styles REST API routes.
- */
-function gutenberg_register_global_styles_endpoints() {
-	$editor_settings = new Gutenberg_REST_Global_Styles_Controller();
-	$editor_settings->register_routes();
-}
-add_action( 'rest_api_init', 'gutenberg_register_global_styles_endpoints' );
-
 /**
  * Registers the Edit Site's Export REST API routes.
  *

phpunit/class-gutenberg-rest-global-styles-controller-test.php

@@ -54,25 +54,67 @@ public static function wpSetupBeforeClass( $factory ) {
 		);
 	}
 
+
 	public function test_register_routes() {
 		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey(
-			'/wp/v2/global-styles/(?P<id>[\/\s%\w\.\(\)\[\]\@_\-]+)',
+			// '/wp/v2/global-styles/(?P<id>[\/\s%\w\.\(\)\[\]\@_\-]+)',
+			'/wp/v2/global-styles/(?P<id>[\/\w-]+)',
 			$routes,
 			'Single global style based on the given ID route does not exist'
 		);
 		$this->assertArrayHasKey(
-			'/wp/v2/global-styles/themes/(?P<stylesheet>[\/\s%\w\.\(\)\[\]\@_\-]+)',
+			'/wp/v2/global-styles/themes/(?P<stylesheet>[^\/:<>\*\?"\|]+(?:\/[^\/:<>\*\?"\|]+)?)',
 			$routes,
 			'Theme global styles route does not exist'
 		);
+		$this->assertArrayHasKey(
+			'/wp/v2/global-styles/themes/(?P<stylesheet>[\/\s%\w\.\(\)\[\]\@_\-]+)/variations',
+			$routes,
+			'Theme global styles variations route does not exist'
+		);
 	}
 
 	public function test_context_param() {
 		// TODO: Implement test_context_param() method.
 		$this->markTestIncomplete();
 	}
 
+	public function test_get_theme_items() {
+		wp_set_current_user( self::$admin_id );
+		$request  = new WP_REST_Request( 'GET', '/wp/v2/global-styles/themes/emptytheme/variations' );
+		$response = rest_get_server()->dispatch( $request );
+		$data     = $response->get_data();
+		$expected = array(
+			array(
+				'version'  => 2,
+				'settings' => array(
+					'color' => array(
+						'palette' => array(
+							'theme' => array(
+								array(
+									'slug'  => 'foreground',
+									'color' => '#3F67C6',
+									'name'  => 'Foreground',
+								),
+							),
+						),
+					),
+				),
+				'styles'   => array(
+					'blocks' => array(
+						'core/post-title' => array(
+							'typography' => array(
+								'fontWeight' => '700',
+							),
+						),
+					),
+				),
+			),
+		);
+		$this->assertSameSetsWithIndex( $data, $expected );
+	}
+
 	public function test_get_items() {
 		$this->markTestIncomplete();
 	}

test/emptytheme/styles/variation.json

@@ -0,0 +1,23 @@
+{
+	"version": 2,
+	"settings": {
+		"color": {
+			"palette": [
+				{
+					"slug": "foreground",
+					"color": "#3F67C6",
+					"name": "Foreground"
+				}
+			]
+		}
+	},
+	"styles": {
+		"blocks": {
+			"core/post-title": {
+				"typography": {
+					"fontWeight": "700"
+				}
+			}
+		}
+	}
+}