# From https://simpleisbetterthancomplex.com/tutorial/2017/02/06/how-to-implement-case-insensitive-username.html from django.contrib.auth import get_user_model from django.contrib.auth.backends import ModelBackend class CaseInsensitiveModelBackend(ModelBackend): def authenticate(self, request, username=None, password=None, **kwargs): UserModel = get_user_model() if username is None: username = kwargs.get(UserModel.USERNAME_FIELD) try: case_insensitive_username_field = '{}__iexact'.format(UserModel.USERNAME_FIELD) user = UserModel._default_manager.get(**{case_insensitive_username_field: username}) except UserModel.DoesNotExist: # Run the default password hasher once to reduce the timing # difference between an existing and a non-existing user (#20760). UserModel().set_password(password) else: if user.check_password(password) and self.user_can_authenticate(user): return user