utils.py

from django.conf import settings


def can_use_oauth_check(user):
    """
    Checks that the user belongs to the whitelisted domains.
    Anonymous or non-whitelisted email domains cannot log in
    or associate OAuth accounts
    """
    try:
        domain = user.email.split('@')[-1]
        return domain in settings.SOCIAL_AUTH_GOOGLE_OAUTH2_WHITELISTED_DOMAINS
    except AttributeError:
        # Anonymous user or setting not defined
        pass
    return False