MAPG-143 make it possible to disable game for guests (default is disable)

src/Controller/GameFlowController.php

@@ -1,6 +1,7 @@
 <?php namespace MapGuesser\Controller;
 
 use DateTime;
+use MapGuesser\Interfaces\Authorization\ISecured;
 use MapGuesser\Interfaces\Request\IRequest;
 use MapGuesser\Util\Geo\Position;
 use MapGuesser\Response\JsonContent;
@@ -12,7 +13,7 @@ use MapGuesser\Repository\MultiRoomRepository;
 use MapGuesser\Repository\PlaceRepository;
 use MapGuesser\Repository\UserPlayedPlaceRepository;
 
-class GameFlowController
+class GameFlowController implements ISecured
 {
     const NUMBER_OF_ROUNDS = 5;
     const MAX_SCORE = 1000;
@@ -39,6 +40,11 @@ class GameFlowController
         $this->userPlayedPlaceRepository = new UserPlayedPlaceRepository();
     }
 
+    public function authorize(): bool
+    {
+        return !empty($_ENV['ENABLE_GAME_FOR_GUESTS']) || $this->request->user() !== null;
+    }
+
     public function initialData(): IContent
     {
         $mapId = (int) $this->request->query('mapId');