Write to event log, when a user gets impersonated

src/EventSubscriber/SwitchUserEventSubscriber.php

@@ -0,0 +1,64 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2023 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+
+namespace App\EventSubscriber;
+
+use App\Entity\UserSystem\User;
+use App\Events\SecurityEvent;
+use App\Events\SecurityEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Security\Core\Authentication\Token\SwitchUserToken;
+use Symfony\Component\Security\Http\Event\SwitchUserEvent;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+
+class SwitchUserEventSubscriber implements EventSubscriberInterface
+{
+
+    public function __construct(private readonly EventDispatcherInterface $eventDispatcher)
+    {
+    }
+
+    public static function getSubscribedEvents()
+    {
+        return [
+            'security.switch_user' => 'onSwitchUser',
+        ];
+    }
+
+    public function onSwitchUser(SwitchUserEvent $event): void
+    {
+        $target_user = $event->getTargetUser();
+        // We can only handle User objects
+        if (!$target_user instanceof User) {
+            return;
+        }
+
+        //We are only interested in impersonation (not unimpersonation)
+        if (!$event->getToken() instanceof SwitchUserToken) {
+            return;
+        }
+
+        $security_event = new SecurityEvent($target_user);
+        $this->eventDispatcher->dispatch($security_event, SecurityEvents::USER_IMPERSONATED);
+    }
+}