django-allauth-cas/allauth_cas/signals.py

from allauth.socialaccount.adapter import get_adapter
from allauth.account.utils import get_next_redirect_url
from allauth.socialaccount import providers
from django.contrib.auth.signals import user_logged_out
from django.dispatch import receiver

from . import CAS_PROVIDER_SESSION_KEY


@receiver(user_logged_out)
def cas_account_logout(sender, request, **kwargs):
    provider_id = request.session.get(CAS_PROVIDER_SESSION_KEY)

    if not provider_id:
        return

    provider = get_adapter(request).get_provider(request, provider_id)

    if not provider.message_suggest_caslogout_on_logout(request):
        return

    next_page = get_next_redirect_url(request) or get_adapter(
        request
    ).get_logout_redirect_url(request)

    provider.add_message_suggest_caslogout(
        request,
        next_page=next_page,
        level=provider.message_suggest_caslogout_on_logout_level(request),
    )