From 9d5dbbbd2f8263a13bd232852ac5637a9501b6f5 Mon Sep 17 00:00:00 2001
From: Brandon Kelly <brandon@pixelandtonic.com>
Date: Mon, 19 Oct 2020 06:52:03 -0700
Subject: [PATCH] Fixed #278

---
 CHANGELOG.md  | 5 +++++
 src/Field.php | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9230599..6276f56 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Release Notes for Redactor for Craft CMS
 
+## Unreleased
+
+### Fixed
+- Fixed a bug where protocol-relative YouTube and Vimeo video URLs were getting stripped by HTML Purifier. ([#278](https://github.com/craftcms/redactor/issues/278))
+
 ## 2.8.2 - 2020-10-14
 
 ### Added
diff --git a/src/Field.php b/src/Field.php
index d6eea76..74ae172 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -1017,7 +1017,7 @@ private function _getPurifierConfig(): HTMLPurifier_Config
             'Attr.EnableID' => true,
             'HTML.AllowedComments' => ['pagebreak'],
             'HTML.SafeIframe' => true,
-            'URI.SafeIframeRegexp' => '%^https?://(www.youtube.com/embed/|player.vimeo.com/video/)%',
+            'URI.SafeIframeRegexp' => '%^(https?:)?//(www.youtube.com/embed/|player.vimeo.com/video/)%',
         ];
 
         foreach ($config as $option => $value) {