Manage channels permissions

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

chat/consumers.py

@@ -2,8 +2,11 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from channels.generic.websocket import AsyncJsonWebsocketConsumer
+from django.contrib.auth.models import User
 from registration.models import Registration
 
+from .models import Channel
+
 
 class ChatConsumer(AsyncJsonWebsocketConsumer):
     """
@@ -15,6 +18,8 @@ class ChatConsumer(AsyncJsonWebsocketConsumer):
         We accept only if this is a user of a team of the associated tournament, or a volunteer
         of the tournament.
         """
+        if '_fake_user_id' in self.scope['session']:
+            self.scope['user'] = await User.objects.aget(pk=self.scope['session']['_fake_user_id'])
 
         # Fetch the registration of the current user
         user = self.scope['user']
@@ -43,4 +48,28 @@ class ChatConsumer(AsyncJsonWebsocketConsumer):
         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
+        match content['type']:
+            case 'fetch_channels':
+                await self.fetch_channels()
+            case unknown:
+                print("Unknown message type:", unknown)
+
+    async def fetch_channels(self) -> None:
+        user = self.scope['user']
+
+        read_channels = await Channel.get_accessible_channels(user, 'read')
+        write_channels = await Channel.get_accessible_channels(user, 'write')
+        print([channel async for channel in write_channels.all()])
+        message = {
+            'type': 'fetch_channels',
+            'channels': [
+                {
+                    'id': channel.id,
+                    'name': channel.name,
+                    'read_access': True,
+                    'write_access': await write_channels.acontains(channel),
+                }
+                async for channel in read_channels.all()
+            ]
+        }
+        await self.send_json(message)