ddperm.py

from rest_framework import permissions

class IsAuthenticatedDD(permissions.BasePermission):
    """
    Allows access only to authenticated users who are DDs.
    Based on IsAuthenticated
    https://github.com/encode/django-rest-framework/blob/master/rest_framework/permissions.py#L44
    """

    def has_permission(self, request, view):
        return request.user and is_authenticated(request.user) and request.user.is_dd