from django.conf import settings

from django.contrib.auth.models import Group

from django.dispatch import receiver

from django_cas_ng.signals import cas_user_authenticated

@receiver(cas_user_authenticated)

def update_created_user(sender, **kwargs):

    created = kwargs.get('created', False)

    user = kwargs.get('user', None)

    attributes = kwargs.get('attributes', {})

    if not created or not user:

        return

    user.first_name = attributes.get('first_name','')

    user.last_name = attributes.get('last_name', '')

    cas_user_group_name = getattr(settings, 'CAS_USER_DEFAULT_GROUP', None)

    if cas_user_group_name and cas_user_group_name not in [g.name for g in user.groups.all()]:

        cas_user_group, _ = Group.objects.get_or_create(name=cas_user_group_name)

        user.groups.add(cas_user_group)

    user.save()