gistfile1.py

from django.core.validators import email_re
from django.contrib.auth.backends import ModelBackend
from django.contrib.auth.models import User


class YaraAuthenticationBackend(ModelBackend):

    def authenticate(self, identification, password=None):
            try:
                if email_re.search(identification):
                    user = User.objects.get(email__iexact=identification)
                else:
                    user = User.objects.get(username__iexact=identification)
                if user.check_password(password):
                    return user
            except User.DoesNotExist:
                return None