REST API: Only expose formats supported by the current theme.

While it's valid to save any format to the database, and WordPress is totally fine with that, we should only include the formats specified by the theme in the schema.

Props danielbachhuber.
Fixes #38610.

Built from https://develop.svn.wordpress.org/trunk@39084


git-svn-id: http://core.svn.wordpress.org/trunk@39026 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php

@@ -1923,10 +1923,11 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 					break;
 
 				case 'post-formats':
+					$supports_formats = get_theme_support( 'post-formats' );
 					$schema['properties']['format'] = array(
 						'description' => __( 'The format for the object.' ),
 						'type'        => 'string',
-						'enum'        => array_values( get_post_format_slugs() ),
+						'enum'        => $supports_formats ? array_values( $supports_formats[0] ) : array(),
 						'context'     => array( 'view', 'edit' ),
 					);
 					break;

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta1-39083';
+$wp_version = '4.7-beta1-39084';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.