From 7a8d800024b297fd8cffe35a5398a52c2388bd19 Mon Sep 17 00:00:00 2001
From: Hypolite Petovan <hypolite@mrpetovan.com>
Date: Tue, 24 Aug 2021 11:32:27 -0400
Subject: [PATCH] Add probe support to `@user@domain.tld` search string format

---
 mod/follow.php             | 3 +--
 src/Console/Contact.php    | 3 +++
 src/Module/Debug/Probe.php | 1 +
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/mod/follow.php b/mod/follow.php
index 075e58d091..09201bed16 100644
--- a/mod/follow.php
+++ b/mod/follow.php
@@ -60,8 +60,7 @@ function follow_content(App $a)
 
 	$uid = local_user();
 
-	// Issue 4815: Silently removing a prefixing @
-	$url = ltrim(Strings::escapeTags(trim($_REQUEST['url'] ?? '')), '@!');
+	$url = Probe::cleanURI(trim($_REQUEST['url'] ?? ''));
 
 	// Issue 6874: Allow remote following from Peertube
 	if (strpos($url, 'acct:') === 0) {
diff --git a/src/Console/Contact.php b/src/Console/Contact.php
index ba65c00251..9dfcf13925 100644
--- a/src/Console/Contact.php
+++ b/src/Console/Contact.php
@@ -25,6 +25,7 @@ use Console_Table;
 use Friendica\App;
 use Friendica\Model\Contact as ContactModel;
 use Friendica\Model\User as UserModel;
+use Friendica\Network\Probe;
 use Friendica\Util\Temporal;
 use RuntimeException;
 use Seld\CliPrompt\CliPrompt;
@@ -153,6 +154,8 @@ HELP;
 			}
 		}
 
+		$url = Probe::cleanURI($url);
+
 		$contact = ContactModel::getByURLForUser($url, $user['uid']);
 		if (!empty($contact)) {
 			throw new RuntimeException('Contact already exists');
diff --git a/src/Module/Debug/Probe.php b/src/Module/Debug/Probe.php
index 86aa4afd11..6c2891c0be 100644
--- a/src/Module/Debug/Probe.php
+++ b/src/Module/Debug/Probe.php
@@ -44,6 +44,7 @@ class Probe extends BaseModule
 		$res  = '';
 
 		if (!empty($addr)) {
+			$addr = NetworkProbe::cleanURI($addr);
 			$res = NetworkProbe::uri($addr, '', 0);
 			$res = print_r($res, true);
 		}