added form to edit user roles #4 (#18)

added voter to handle user profile access
using Security annotation to handle access authorization

src/AppBundle/Voter/UserVoter.php

@@ -0,0 +1,112 @@
+<?php
+
+/*
+ * This file is part of the Kimai package.
+ *
+ * (c) Kevin Papst <kevin@kevinpapst.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace AppBundle\Voter;
+
+use AppBundle\Entity\User;
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+
+/**
+ * A voter to check permissions on user profiles.
+ *
+ * @author Kevin Papst <kevin@kevinpapst.de>
+ */
+class UserVoter extends AbstractVoter
+{
+    const VIEW = 'view';
+    const EDIT = 'edit';
+    const DELETE = 'delete';
+    const PASSWORD = 'password';
+    const ROLES = 'roles';
+
+    /**
+     * @param string $attribute
+     * @param mixed $subject
+     * @return bool
+     */
+    protected function supports($attribute, $subject)
+    {
+        if (!in_array($attribute, array(self::VIEW, self::EDIT, self::ROLES, self::PASSWORD, self::DELETE))) {
+            return false;
+        }
+
+        if (!$subject instanceof User) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * @param string $attribute
+     * @param User $subject
+     * @param TokenInterface $token
+     * @return bool
+     */
+    protected function voteOnAttribute($attribute, $subject, TokenInterface $token)
+    {
+        $user = $token->getUser();
+
+        if (!$user instanceof User) {
+            return false;
+        }
+
+        switch ($attribute) {
+            case self::VIEW:
+                return $this->canView($subject, $user, $token);
+            case self::EDIT:
+            case self::PASSWORD:
+                return $this->canEdit($subject, $user, $token);
+            case self::DELETE:
+            case self::ROLES:
+                return $this->canEditRoles($token);
+        }
+
+        return false;
+    }
+
+    /**
+     * @param User $profile
+     * @param User $user
+     * @return bool
+     */
+    private function canView(User $profile, User $user, TokenInterface $token)
+    {
+        if ($this->canEdit($profile, $user, $token)) {
+            return true;
+        }
+
+        return $profile->getId() == $user->getId();
+    }
+
+    /**
+     * @param User $profile
+     * @param User $user
+     * @return bool
+     */
+    private function canEdit(User $profile, User $user, TokenInterface $token)
+    {
+        if ($this->canEditRoles($token)) {
+            return true;
+        }
+
+        return $profile->getId() == $user->getId();
+    }
+
+    /**
+     * @param TokenInterface $token
+     * @return bool
+     */
+    private function canEditRoles(TokenInterface $token)
+    {
+        return $this->hasRole('ROLE_SUPER_ADMIN', $token);
+    }
+}