Reject unauthenticated users + exponential wait time

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

draw/consumers.py

@@ -51,6 +51,7 @@ class DrawConsumer(AsyncJsonWebsocketConsumer):
             # User is not authenticated
             await self.close()
             return
+
         reg = await Registration.objects.aget(user_id=user.id)
         self.registration = reg
 
@@ -75,6 +76,10 @@ class DrawConsumer(AsyncJsonWebsocketConsumer):
         Called when the websocket got disconnected, for any reason.
         :param close_code: The error code.
         """
+        if self.scope['user'].is_anonymous:
+            # User is not authenticated
+            return
+
         # Unregister from channel layers
         if not self.registration.is_volunteer:
             await self.channel_layer.group_discard(f"team-{self.registration.team.trigram}", self.channel_name)