From 4e05ff6a1166cad75d0002a34bbfd8d74e4f77ec Mon Sep 17 00:00:00 2001
From: Ryan McCue <me@ryanmccue.info>
Date: Mon, 21 Nov 2016 05:32:33 +0000
Subject: [PATCH] REST API: Disable anonymous commenting by default.

Adding a brand new anonymous comment method is a potential conduit for spam. Since it's still useful functionality, we're now hiding it behind a filter to allow plugins and themes to turn it on if they do want it.

Props helen, rachelbaker, joehoyle.
Fixes #38855.

Built from https://develop.svn.wordpress.org/trunk@39327


git-svn-id: http://core.svn.wordpress.org/trunk@39267 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 .../class-wp-rest-comments-controller.php     | 22 +++++++++++++++++--
 wp-includes/version.php                       |  2 +-
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
index 9071697f9a..0ddd023605 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
@@ -366,9 +366,27 @@ class WP_REST_Comments_Controller extends WP_REST_Controller {
 	 * @return WP_Error|bool True if the request has access to create items, error object otherwise.
 	 */
 	public function create_item_permissions_check( $request ) {
+		if ( ! is_user_logged_in() ) {
+			if ( get_option( 'comment_registration' ) ) {
+				return new WP_Error( 'rest_comment_login_required', __( 'Sorry, you must be logged in to comment.' ), array( 'status' => 401 ) );
+			}
 
-		if ( ! is_user_logged_in() && get_option( 'comment_registration' ) ) {
-			return new WP_Error( 'rest_comment_login_required', __( 'Sorry, you must be logged in to comment.' ), array( 'status' => 401 ) );
+			/**
+			 * Filter whether comments can be created without authentication.
+			 *
+			 * Enables creating comments for anonymous users.
+			 *
+			 * @since 4.7.0
+			 *
+			 * @param bool $allow_anonymous Whether to allow anonymous comments to
+			 *                              be created. Default `false`.
+			 * @param WP_REST_Request $request Request used to generate the
+			 *                                 response.
+			 */
+			$allow_anonymous = apply_filters( 'rest_allow_anonymous_comments', false, $request );
+			if ( false === $allow_anonymous ) {
+				return new WP_Error( 'rest_comment_login_required', __( 'Sorry, you must be logged in to comment.' ), array( 'status' => 401 ) );
+			}
 		}
 
 		// Limit who can set comment `author`, `author_ip` or `status` to anything other than the default.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 55d417dbab..7c9b16bf00 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta4-39326';
+$wp_version = '4.7-beta4-39327';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.