From 4011a113ccc1241b60f607ce76db982625f7b9b1 Mon Sep 17 00:00:00 2001
From: Omar Roth <omarroth@protonmail.com>
Date: Sun, 15 Mar 2020 17:37:51 -0400
Subject: [PATCH] Strip invalid characters from referer URLs

---
 src/invidious/helpers/utils.cr | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/invidious/helpers/utils.cr b/src/invidious/helpers/utils.cr
index 7c5edc5ca..a0a619fa6 100644
--- a/src/invidious/helpers/utils.cr
+++ b/src/invidious/helpers/utils.cr
@@ -316,7 +316,7 @@ def get_referer(env, fallback = "/", unroll = true)
   end
 
   referer = referer.full_path
-  referer = "/" + referer.lstrip("/\\")
+  referer = "/" + referer.gsub(/[^\/?@&%=\-_.0-9a-zA-Z]/, "").lstrip("/\\")
 
   if referer == env.request.path
     referer = fallback