def get_user_db_from_request(request):
        """
        Retrieve UserDB object from the provided request.
        """
        auth_context = request.context.get("auth", {})

        if not auth_context:
            return None

        user_db = auth_context.get("user", None)
        return user_db

        Retrieve UserDB object from the provided request.
        
st2common/st2common/rbac/backends/base.py