code: def get_or_create_user(self, username, ldap_user):
          
          model = self.get_user_model()
          username_field = getattr(model, 'USERNAME_FIELD', 'username')
  
          kwargs = {
              username_field + '__iexact': username,
              'defaults': {username_field: username.lower()}
          }
  
          return model.objects.get_or_create(**kwargs)
docs: This must return a (User, created) 2-tuple for the given LDAP user.
          username is the Django-friendly username of the user. ldap_user.dn is
          the user's DN and ldap_user.attrs contains all of their LDAP attributes.