Token authorization middleware for Django Channels 3

Django_Channels3_Custom_Auth_Middleware.py

from django.contrib.auth.models import AnonymousUser
from rest_framework.authtoken.models import Token
from channels.db import database_sync_to_async
from channels.middleware import BaseMiddleware
from project.settings import SIMPLE_JWT, SECRET_KEY

@database_sync_to_async
def get_user(token_key):
    # If you are using normal token based authentication
    try:
        token = Token.objects.get(key=token_key)
        return token.user
    except Token.DoesNotExist:
        return AnonymousUser()

    # If you are using jwt
    try:
        user_id: int = jwt.decode(token_key, SECRET_KEY, algorithms=[SIMPLE_JWT['ALGORITHM']]).get(SIMPLE_JWT['USER_ID_CLAIM'])
    except jwt.exceptions.DecodeError:
        return AnonymousUser()
    except jwt.exceptions.ExpiredSignatureError:
        return AnonymousUser()
    try:
        return AnonymousUser() if user_id is None else User.objects.get(id=user_id)
    except User.DoesNotExist:
        return AnonymousUser()



class TokenAuthMiddleware(BaseMiddleware):
    def __init__(self, inner):
        super().__init__(inner)

    async def __call__(self, scope, receive, send):
        try:
            token_key = (dict((x.split('=') for x in scope['query_string'].decode().split("&")))).get('token', None)
        except ValueError:
            token_key = None
        scope['user'] = AnonymousUser() if token_key is None else await get_user(token_key)
        return await super().__call__(scope, receive, send)

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