Added basic logic for impersonation

src/Security/Voter/ImpersonateUserVoter.php

@@ -0,0 +1,60 @@
+<?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\Security\Voter;
+
+use App\Entity\UserSystem\User;
+use App\Services\UserSystem\PermissionManager;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+use Symfony\Component\Security\Core\Authorization\Voter\Voter;
+use Symfony\Component\Security\Core\User\UserInterface;
+
+class ImpersonateUserVoter extends Voter
+{
+
+    public function __construct(private PermissionManager $permissionManager)
+    {
+    }
+
+    protected function supports(string $attribute, mixed $subject): bool
+    {
+        return $attribute == 'CAN_SWITCH_USER'
+            && $subject instanceof UserInterface;
+    }
+
+    protected function voteOnAttribute(string $attribute, mixed $subject, TokenInterface $token): bool
+    {
+        $user = $token->getUser();
+
+        if (!$user instanceof User || !$subject instanceof UserInterface) {
+            return false;
+        }
+
+        //An disabled user is not allowed to do anything...
+        if ($user->isDisabled()) {
+            return false;
+        }
+
+        return $this->permissionManager->inherit($user, 'users', 'impersonate') ?? false;
+    }
+}

src/Twig/UserExtension.php

@@ -46,6 +46,8 @@ use App\Entity\UserSystem\User;
 use App\Entity\LogSystem\AbstractLogEntry;
 use App\Repository\LogEntryRepository;
 use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\Security\Core\Authentication\Token\SwitchUserToken;
 use Twig\Extension\AbstractExtension;
 use Twig\TwigFilter;
 use Twig\TwigFunction;
@@ -57,7 +59,7 @@ final class UserExtension extends AbstractExtension
 {
     private readonly LogEntryRepository $repo;
 
-    public function __construct(EntityManagerInterface $em)
+    public function __construct(EntityManagerInterface $em, private readonly Security $security)
     {
         $this->repo = $em->getRepository(AbstractLogEntry::class);
     }
@@ -76,9 +78,31 @@ final class UserExtension extends AbstractExtension
             new TwigFunction('last_editing_user', fn(AbstractDBElement $element): ?User => $this->repo->getLastEditingUser($element)),
             /* Returns the user which has created the given entity. */
             new TwigFunction('creating_user', fn(AbstractDBElement $element): ?User => $this->repo->getCreatingUser($element)),
+            new TwigFunction('impersonator_user', $this->getImpersonatorUser(...)),
+            new TwigFunction('impersonation_active', $this->isImpersonationActive(...)),
         ];
     }
 
+    /**
+     * This function returns the user which has impersonated the current user.
+     * If the current user is not impersonated, null is returned.
+     * @return User|null
+     */
+    public function getImpersonatorUser(): ?User
+    {
+        $token = $this->security->getToken();
+        if ($token instanceof SwitchUserToken) {
+            return $token->getOriginalToken()->getUser();
+        }
+
+        return null;
+    }
+
+    public function isImpersonationActive(): bool
+    {
+        return $this->security->isGranted('IS_IMPERSONATOR');
+    }
+
     /**
      * This function/filter generates a path.
      */