You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
146 lines
5.0 KiB
Python
146 lines
5.0 KiB
Python
import asyncio
|
|
import typing as t
|
|
|
|
import aioredis
|
|
from asgiref.sync import sync_to_async
|
|
from django.db.models import QuerySet
|
|
from fastapi import APIRouter, Depends, WebSocket, WebSocketDisconnect, status
|
|
import nacl.encoding
|
|
import nacl.utils
|
|
|
|
from django_etebase import models
|
|
from django_etebase.utils import CallbackContext, get_user_queryset
|
|
from myauth.models import UserType, get_typed_user_model
|
|
|
|
from ..dependencies import get_collection_queryset, get_item_queryset
|
|
from ..exceptions import NotSupported
|
|
from ..msgpack import MsgpackRoute, msgpack_decode, msgpack_encode
|
|
from ..redis import redisw
|
|
from ..utils import BaseModel, permission_responses
|
|
|
|
|
|
User = get_typed_user_model()
|
|
websocket_router = APIRouter(route_class=MsgpackRoute, responses=permission_responses)
|
|
CollectionQuerySet = QuerySet[models.Collection]
|
|
|
|
|
|
TICKET_VALIDITY_SECONDS = 10
|
|
|
|
|
|
class TicketRequest(BaseModel):
|
|
collection: str
|
|
|
|
|
|
class TicketOut(BaseModel):
|
|
ticket: str
|
|
|
|
|
|
class TicketInner(BaseModel):
|
|
user: int
|
|
req: TicketRequest
|
|
|
|
|
|
async def get_ticket(
|
|
ticket_request: TicketRequest,
|
|
user: UserType,
|
|
):
|
|
"""Get an authentication ticket that can be used with the websocket endpoint for authentication"""
|
|
if not redisw.is_active:
|
|
raise NotSupported(detail="This end-point requires Redis to be configured")
|
|
|
|
uid = nacl.encoding.URLSafeBase64Encoder.encode(nacl.utils.random(32))
|
|
ticket_model = TicketInner(user=user.id, req=ticket_request)
|
|
ticket_raw = msgpack_encode(ticket_model.dict())
|
|
await redisw.redis.set(uid, ticket_raw, expire=TICKET_VALIDITY_SECONDS * 1000)
|
|
return TicketOut(ticket=uid)
|
|
|
|
|
|
async def load_websocket_ticket(websocket: WebSocket, ticket: str) -> t.Optional[TicketInner]:
|
|
content = await redisw.redis.get(ticket)
|
|
if content is None:
|
|
await websocket.close(code=status.WS_1008_POLICY_VIOLATION)
|
|
return None
|
|
await redisw.redis.delete(ticket)
|
|
return TicketInner(**msgpack_decode(content))
|
|
|
|
|
|
def get_websocket_user(websocket: WebSocket, ticket_model: t.Optional[TicketInner] = Depends(load_websocket_ticket)):
|
|
if ticket_model is None:
|
|
return None
|
|
user_queryset = get_user_queryset(User.objects.all(), CallbackContext(websocket.path_params))
|
|
return user_queryset.get(id=ticket_model.user)
|
|
|
|
|
|
@websocket_router.websocket("/{ticket}/")
|
|
async def websocket_endpoint(
|
|
websocket: WebSocket,
|
|
stoken: t.Optional[str] = None,
|
|
user: t.Optional[UserType] = Depends(get_websocket_user),
|
|
ticket_model: TicketInner = Depends(load_websocket_ticket),
|
|
):
|
|
if user is None:
|
|
return
|
|
await websocket.accept()
|
|
await redis_connector(websocket, ticket_model, user, stoken)
|
|
|
|
|
|
async def send_item_updates(
|
|
websocket: WebSocket,
|
|
collection: models.Collection,
|
|
user: UserType,
|
|
stoken: t.Optional[str],
|
|
):
|
|
from .collection import item_list_common
|
|
|
|
done = False
|
|
while not done:
|
|
queryset = await sync_to_async(get_item_queryset)(collection)
|
|
response = await sync_to_async(item_list_common)(queryset, user, stoken, limit=50, prefetch="auto")
|
|
done = response.done
|
|
if len(response.data) > 0:
|
|
await websocket.send_bytes(msgpack_encode(response.dict()))
|
|
|
|
|
|
async def redis_connector(websocket: WebSocket, ticket_model: TicketInner, user: UserType, stoken: t.Optional[str]):
|
|
async def producer_handler(r: aioredis.Redis, ws: WebSocket):
|
|
channel_name = f"col.{ticket_model.req.collection}"
|
|
(channel,) = await r.psubscribe(channel_name)
|
|
assert isinstance(channel, aioredis.Channel)
|
|
|
|
# Send missing items if we are not up to date
|
|
queryset: QuerySet[models.Collection] = get_collection_queryset(user)
|
|
collection: t.Optional[models.Collection] = await sync_to_async(
|
|
queryset.filter(uid=ticket_model.req.collection).first
|
|
)()
|
|
if collection is None:
|
|
await websocket.close(code=status.WS_1008_POLICY_VIOLATION)
|
|
return
|
|
await send_item_updates(websocket, collection, user, stoken)
|
|
|
|
try:
|
|
while True:
|
|
# We wait on the websocket so we fail if web sockets fail or get data
|
|
receive = asyncio.create_task(websocket.receive())
|
|
done, pending = await asyncio.wait(
|
|
{receive, channel.wait_message()}, return_when=asyncio.FIRST_COMPLETED
|
|
)
|
|
for task in pending:
|
|
task.cancel()
|
|
if receive in done:
|
|
# Web socket should never receieve any data
|
|
await websocket.close(code=status.WS_1008_POLICY_VIOLATION)
|
|
return
|
|
|
|
message_raw = t.cast(t.Optional[t.Tuple[str, bytes]], await channel.get())
|
|
if message_raw:
|
|
_, message = message_raw
|
|
await ws.send_bytes(message)
|
|
|
|
except aioredis.errors.ConnectionClosedError:
|
|
await websocket.close(code=status.WS_1012_SERVICE_RESTART)
|
|
except WebSocketDisconnect:
|
|
pass
|
|
|
|
redis = redisw.redis
|
|
await producer_handler(redis, websocket)
|