Initialize chat interface

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

chat/consumers.py

@@ -0,0 +1,46 @@
+# Copyright (C) 2024 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from channels.generic.websocket import AsyncJsonWebsocketConsumer
+from registration.models import Registration
+
+
+class ChatConsumer(AsyncJsonWebsocketConsumer):
+    """
+    This consumer manages the websocket of the chat interface.
+    """
+    async def connect(self) -> None:
+        """
+        This function is called when a new websocket is trying to connect to the server.
+        We accept only if this is a user of a team of the associated tournament, or a volunteer
+        of the tournament.
+        """
+
+        # Fetch the registration of the current user
+        user = self.scope['user']
+        if user.is_anonymous:
+            # User is not authenticated
+            await self.close()
+            return
+
+        reg = await Registration.objects.aget(user_id=user.id)
+        self.registration = reg
+
+        # Accept the connection
+        await self.accept()
+
+    async def disconnect(self, close_code) -> None:
+        """
+        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
+
+    async def receive_json(self, content, **kwargs):
+        """
+        Called when the client sends us some data, parsed as JSON.
+        :param content: The sent data, decoded from JSON text. Must content a `type` field.
+        """
+        # TODO Process chat protocol