From 644c08a035fec6d63cd566e70ca058c5a80d3fc1 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Sat, 29 Jun 2019 19:01:07 +0000
Subject: [PATCH] Issue 4815: Silently ignoring trailing @ at follow requests

---
 mod/follow.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mod/follow.php b/mod/follow.php
index 8a00e0559c..1f12f565e6 100644
--- a/mod/follow.php
+++ b/mod/follow.php
@@ -60,7 +60,9 @@ function follow_content(App $a)
 	}
 
 	$uid = local_user();
-	$url = Strings::escapeTags(trim(defaults($_REQUEST, 'url', '')));
+
+	// Issue 4815: Silently removing a trailing @
+	$url = ltrim(Strings::escapeTags(trim(defaults($_REQUEST, 'url', ''))), '@!');
 
 	// Issue 6874: Allow remote following from Peertube
 	if (strpos($url, 'acct:') === 0) {