From a8516b7184f96ffa497d39eef869f5acda52d979 Mon Sep 17 00:00:00 2001
From: PHAS Developer <110562019+phasdev@users.noreply.github.com>
Date: Tue, 28 Jan 2025 19:24:43 +0000
Subject: [PATCH] [Security] Return null instead of empty username to fix
 deprecation notice

---
 .../Security/Http/Authenticator/RemoteUserAuthenticator.php     | 2 +-
 .../Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php    | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Security/Http/Authenticator/RemoteUserAuthenticator.php b/src/Symfony/Component/Security/Http/Authenticator/RemoteUserAuthenticator.php
index 958eeaeaec227..39649666ccace 100644
--- a/src/Symfony/Component/Security/Http/Authenticator/RemoteUserAuthenticator.php
+++ b/src/Symfony/Component/Security/Http/Authenticator/RemoteUserAuthenticator.php
@@ -45,6 +45,6 @@ protected function extractUsername(Request $request): ?string
             throw new BadCredentialsException(sprintf('User key was not found: "%s".', $this->userKey));
         }
 
-        return $request->server->get($this->userKey);
+        return $request->server->get($this->userKey) ?: null;
     }
 }
diff --git a/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php b/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
index 5119f8ce09e74..b94f90884e2e0 100644
--- a/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Authenticator/RemoteUserAuthenticatorTest.php
@@ -36,6 +36,7 @@ public function testSupportNoUser()
         $authenticator = new RemoteUserAuthenticator(new InMemoryUserProvider(), new TokenStorage(), 'main');
 
         $this->assertFalse($authenticator->supports($this->createRequest([])));
+        $this->assertFalse($authenticator->supports($this->createRequest(['REMOTE_USER' => ''])));
     }
 
     public function testSupportTokenStorageWithToken()