Deny access to unauthenticated users with django channels

I'm basically after a login_required/LoginRequiredMixin equivalent for django channels. The docs have an authentication section, which describes how to get a user, but it seems to miss the bit where you actually deny access to users who are not authenticated.

from channels.generic.websockets import JsonWebsocketConsumer

class MyConsumer(JsonWebsocketConsumer):

    channel_session_user = True

    def connection_groups(self, **kwargs):
        return ["test"]

    def connect(self, message, **kwargs):
        print message.user # AnonymousUser
        self.send({"accept": True}) # False here still accepts and sends a message

How should I be denying/dropping the connection if message.user.is_anonymous is true?