use username for multi games

src/Controller/GameController.php

@@ -1,7 +1,6 @@
 <?php namespace MapGuesser\Controller;
 
 use DateTime;
-use Faker\Factory;
 use SokoWeb\Interfaces\Authentication\IAuthenticationRequired;
 use SokoWeb\Response\HtmlContent;
 use SokoWeb\Response\JsonContent;
@@ -12,6 +11,7 @@ use MapGuesser\PersistentData\Model\Challenge;
 use MapGuesser\PersistentData\Model\MultiRoom;
 use MapGuesser\PersistentData\Model\PlaceInChallenge;
 use MapGuesser\PersistentData\Model\UserInChallenge;
+use MapGuesser\PersistentData\Model\User;
 use MapGuesser\Repository\ChallengeRepository;
 use MapGuesser\Repository\MapRepository;
 use MapGuesser\Repository\MultiRoomRepository;
@@ -190,13 +190,17 @@ class GameController implements IAuthenticationRequired
 
     public function prepareMultiGame(): IContent
     {
-        $roomId = \Container::$request->query('roomId');
-        $userName = \Container::$request->post('userName');
-        if (empty($userName)) {
-            $faker = Factory::create();
-            $userName = $faker->userName;
+        /**
+         * @var User|null $user
+         */
+        $user = \Container::$request->user();
+        if ($user === null)
+        {
+            return new JsonContent(['error' => 'anonymous_user']);
         }
 
+        $roomId = \Container::$request->query('roomId');
+
         $room = $this->multiRoomRepository->getByRoomId($roomId);
 
         if (!isset($room)) {
@@ -225,7 +229,7 @@ class GameController implements IAuthenticationRequired
         $this->multiConnector->sendMessage('join_room', [
             'roomId' => $roomId,
             'token' => $token,
-            'userName' => $userName
+            'userName' => $user->getDisplayName()
         ]);
 
         return new JsonContent([