Check if user is logged in

def process_request(self, request):
        """Check if user is logged in"""
        assert hasattr(request, 'user')
        if not request.user.is_authenticated():
            path = request.path_info.lstrip('/')
            if not any(m.match(path) for m in EXEMPT_URLS):
                return HttpResponseRedirect(reverse(settings.LOGIN_URL))