How to do token authentication in channels?

Question

Django

Hey! I have the main DRF API. Authorization is done via JWT.
The app will have chats. I want messages to come to the websocket.
The documentation says that for authentication you need to write a custom middleware.
There the mechanism how to receive the user from query_string is described.
Question:
1. Is it possible to access cookies in this middleware without passing the token to the query_string?
2. How to deny access if the token is recognized as invalid? (and should it be)