added configurable permission system (#424)

src/Voter/RolePermissionVoter.php

@@ -0,0 +1,64 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Voter;
+
+use App\Entity\Activity;
+use App\Entity\User;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+
+/**
+ * A voter to check the free-configurable permission from "kimai.permissions".
+ */
+class RolePermissionVoter extends AbstractVoter
+{
+    /**
+     * @param string $attribute
+     * @param mixed $subject
+     * @return bool
+     */
+    protected function supports($attribute, $subject)
+    {
+        // we only work on single strings that have no subject
+        if (null !== $subject) {
+            return false;
+        }
+
+        // and which is not neither a user role like USER_ADMIN
+        // nor an implicit role like IS_REMEMBERED / IS_FULLY_AUTHENTICATED
+        if (strpos($attribute, 'ROLE_') === false && strpos($attribute, 'IS_') === false) {
+            return $this->isRegisteredPermission($attribute);
+        }
+
+        return false;
+    }
+
+    /**
+     * @param string $attribute
+     * @param Activity $subject
+     * @param TokenInterface $token
+     * @return bool
+     */
+    protected function voteOnAttribute($attribute, $subject, TokenInterface $token)
+    {
+        $user = $token->getUser();
+
+        if (!($user instanceof User)) {
+            return false;
+        }
+
+        foreach ($user->getRoles() as $role) {
+            if ($this->hasPermission($role, $attribute)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}