REST API: Check read permissions on posts when viewing comments.

With a few tests for getting / creating comments to reflect core behaviour.

Props timmyc.
Built from https://develop.svn.wordpress.org/trunk@39295


git-svn-id: http://core.svn.wordpress.org/trunk@39235 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -1454,6 +1454,11 @@ class WP_REST_Comments_Controller extends WP_REST_Controller {
 	 */
 	protected function check_read_post_permission( $post ) {
 		$posts_controller = new WP_REST_Posts_Controller( $post->post_type );
+		$post_type = get_post_type_object( $post->post_type );
+
+		if ( post_password_required( $post ) ) {
+			return current_user_can( $post_type->cap->edit_post, $post->ID );
+		}
 
 		return $posts_controller->check_read_permission( $post );
 	}

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta4-39294';
+$wp_version = '4.7-beta4-39295';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.