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278 lines
8.9 KiB
Python
278 lines
8.9 KiB
Python
import json
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from channels.db import database_sync_to_async
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from channels.generic.websocket import AsyncWebsocketConsumer
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from api.models import Order
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from api.tasks import send_notification
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from chat.models import ChatRoom, Message
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class ChatRoomConsumer(AsyncWebsocketConsumer):
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@database_sync_to_async
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def allow_in_chatroom(self):
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order = Order.objects.get(id=self.order_id)
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if order.status not in [Order.Status.CHA, Order.Status.FSE]:
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print("Order is not in chat status")
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return False
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if not (order.maker == self.user or order.taker == self.user):
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print("Not allowed in this chat")
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return False
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return True
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@database_sync_to_async
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def save_connect_user(self):
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"""Creates or updates the ChatRoom object"""
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order = Order.objects.get(id=self.order_id)
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if order.maker == self.user:
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ChatRoom.objects.update_or_create(
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id=self.order_id,
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order=order,
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room_group_name=self.room_group_name,
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defaults={
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"maker": self.user,
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"maker_connected": True,
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"taker": order.taker,
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"taker_connected": True,
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},
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)
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elif order.taker == self.user:
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ChatRoom.objects.update_or_create(
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id=self.order_id,
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order=order,
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room_group_name=self.room_group_name,
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defaults={
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"taker": self.user,
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"taker_connected": True,
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"maker": order.maker,
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"maker_connected": False,
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},
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)
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return None
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@database_sync_to_async
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def save_new_PGP_message(self, PGP_message):
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"""Creates a Message object"""
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order = Order.objects.get(id=self.order_id)
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chatroom = ChatRoom.objects.get(order=order)
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try:
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last_message = Message.objects.filter(order=order).latest()
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index = last_message.index + 1
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except Exception:
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index = 1
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sender = self.scope["user"]
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if order.taker == sender:
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receiver = order.maker
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elif order.maker == sender:
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receiver = order.taker
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msg_obj = Message.objects.create(
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order=order,
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chatroom=chatroom,
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index=index,
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sender=sender,
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receiver=receiver,
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PGP_message=PGP_message,
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)
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# send Telegram notification for new message (if conditions apply)
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send_notification.delay(chat_message_id=msg_obj.id, message="new_chat_message")
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return msg_obj
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@database_sync_to_async
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def save_disconnect_user(self):
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"""Creates or updates the ChatRoom object"""
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order = Order.objects.get(id=self.order_id)
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if order.maker == self.user:
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ChatRoom.objects.update_or_create(
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id=self.order_id, defaults={"maker_connected": False}
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)
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elif order.taker == self.user:
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ChatRoom.objects.update_or_create(
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id=self.order_id, defaults={"taker_connected": False}
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)
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return None
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@database_sync_to_async
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def is_peer_connected(self):
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"""Returns whether the consumer's peer is connected"""
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chatroom = ChatRoom.objects.get(id=self.order_id)
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if chatroom.maker == self.user:
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return chatroom.taker_connected
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if chatroom.taker == self.user:
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return chatroom.maker_connected
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@database_sync_to_async
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def get_peer_PGP_public_key(self):
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"""Returns peer PGP public key"""
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order = Order.objects.get(id=self.order_id)
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if order.maker == self.user:
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return order.taker.robot.public_key
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if order.taker == self.user:
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return order.maker.robot.public_key
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@database_sync_to_async
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def get_all_PGP_messages(self):
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"""Returns all PGP messages"""
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order = Order.objects.get(id=self.order_id)
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messages = Message.objects.filter(order=order)
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msgs = []
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for message in messages:
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msgs.append(
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{
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"index": message.index,
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"time": str(message.created_at),
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"message": message.PGP_message,
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"nick": str(message.sender),
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}
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)
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return msgs
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async def connect(self):
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self.order_id = self.scope["url_route"]["kwargs"]["order_id"]
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self.room_group_name = f"chat_order_{self.order_id}"
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self.user = self.scope["user"]
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self.user_nick = str(self.user)
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allowed = await self.allow_in_chatroom()
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if allowed:
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await self.save_connect_user()
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await self.channel_layer.group_add(self.room_group_name, self.channel_name)
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await self.accept()
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# Send peer PGP public keys
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peer_public_key = await self.get_peer_PGP_public_key()
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peer_connected = await self.is_peer_connected()
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await self.channel_layer.group_send(
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self.room_group_name,
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{
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"type": "chatroom_message",
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"message": peer_public_key,
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"nick": self.scope["user"].username,
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"peer_connected": peer_connected,
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},
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)
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async def disconnect(self, close_code):
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await self.save_disconnect_user()
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await self.channel_layer.group_discard(self.room_group_name, self.channel_name)
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await self.channel_layer.group_send(
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self.room_group_name,
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{
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"type": "chatroom_message",
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"message": "peer-disconnected",
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"nick": self.scope["user"].username,
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"peer_connected": False,
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},
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)
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async def receive(self, text_data):
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text_data_json = json.loads(text_data)
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message = text_data_json["message"]
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peer_connected = await self.is_peer_connected()
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# Encrypted messages are stored. They are served later when a user reconnects.
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if message[0:27] == "-----BEGIN PGP MESSAGE-----":
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# save to database
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msg_obj = await self.save_new_PGP_message(message)
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index = msg_obj.index
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message = msg_obj.PGP_message
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time = str(msg_obj.created_at)
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await self.channel_layer.group_send(
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self.room_group_name,
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{
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"type": "PGP_message",
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"index": index,
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"message": message,
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"time": time,
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"nick": self.scope["user"].username,
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"peer_connected": peer_connected,
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},
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)
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# Encrypted messages are served when the user requests them
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elif message[0:23] == "-----SERVE HISTORY-----":
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# If there is any stored message, serve them.
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msgs = await self.get_all_PGP_messages()
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peer_connected = await self.is_peer_connected()
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for msg in msgs:
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await self.channel_layer.group_send(
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self.room_group_name,
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{
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"type": "PGP_message",
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"index": msg["index"],
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"time": msg["time"],
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"message": msg["message"],
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"nick": msg["nick"],
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"peer_connected": peer_connected,
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},
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)
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# Unencrypted messages are not stored, just echoed.
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else:
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await self.channel_layer.group_send(
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self.room_group_name,
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{
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"type": "chatroom_message",
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"message": message,
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"nick": self.scope["user"].username,
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"peer_connected": peer_connected,
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},
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)
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async def chatroom_message(self, event):
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message = event["message"]
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nick = event["nick"]
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peer_connected = event["peer_connected"]
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await self.send(
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text_data=json.dumps(
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{
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"message": message,
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"user_nick": nick,
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"peer_connected": peer_connected,
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}
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)
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)
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async def PGP_message(self, event):
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message = event["message"]
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nick = event["nick"]
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index = event["index"]
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peer_connected = event["peer_connected"]
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time = event["time"]
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await self.send(
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text_data=json.dumps(
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{
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"index": index,
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"message": message,
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"user_nick": nick,
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"peer_connected": peer_connected,
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"time": time,
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}
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)
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)
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