From ad3b93414aa70ab4270b42c00965e315d622404b Mon Sep 17 00:00:00 2001
From: Rico Sonntag <rico.sonntag@netresearch.de>
Date: Thu, 26 Feb 2026 14:01:37 +0000
Subject: [PATCH] [BUGFIX] Fix undefined array key warning for REMOTE_USER in
 init()

When no Shibboleth session is active, $_SERVER['REMOTE_USER'] is not
set, causing a PHP Warning on every backend request.

Use the null coalescing operator to default to null, which is already
supported by the ?string property type and handled by all callers via
empty() checks.

Fixes #12
---
 Classes/Typo3/Service/ShibbolethAuthenticationService.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Classes/Typo3/Service/ShibbolethAuthenticationService.php b/Classes/Typo3/Service/ShibbolethAuthenticationService.php
index 4d8ccf9..7619d0a 100644
--- a/Classes/Typo3/Service/ShibbolethAuthenticationService.php
+++ b/Classes/Typo3/Service/ShibbolethAuthenticationService.php
@@ -50,7 +50,7 @@ public function init(): bool
         if (empty($this->extensionConfiguration['displayName'])) {
             $this->extensionConfiguration['displayName'] = 'displayName';
         }
-        $this->remoteUser = $_SERVER[$this->extensionConfiguration['remoteUser']];
+        $this->remoteUser = $_SERVER[$this->extensionConfiguration['remoteUser']] ?? null;
         return parent::init();
     }