Forbid access to homepage if a user has no allow permission

This allows to block access to everything (even the homepage) for anonymous access. This fixes issue #290

src/Security/Voter/HasAccessPermissionsVoter.php

@@ -0,0 +1,45 @@
+<?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;
+
+/**
+ * This voter implements a virtual role, which can be used if the user has any permission set to allowed.
+ * We use this to restrict access to the homepage.
+ */
+class HasAccessPermissionsVoter extends ExtendedVoter
+{
+    public const ROLE = "HAS_ACCESS_PERMISSIONS";
+
+    protected function voteOnUser(string $attribute, $subject, User $user): bool
+    {
+        return $this->resolver->hasAnyPermissionSetToAllowInherited($user);
+    }
+
+    protected function supports(string $attribute, mixed $subject): bool
+    {
+        return $attribute === self::ROLE;
+    }
+}