Classview扩展ViewSet时出现权限错误，如何向非模型Viewset添加权限？

Question

我正在尝试创建一组与Django中的模型无关的端点。我正在使用Oauth2进行身份验证，并且一直出现403错误，要求缺少权限。

如何知道此端点缺少哪些权限？

我尝试使用 permission_classes = [IsAuthenticated] ，但没有成功

class RealTimeMonitoringViewSet(viewsets.ViewSet, NoModelBaseViewSet):

extra_serializers = {
    "transcoding": serializers.RealTimeTranscodeSerializer,
}

@list_route(methods=["get"])
def transcoding(self, request):

    if request.user.is_anonymous():
        return Response(status=status.HTTP_401_UNAUTHORIZED)

    if request.user.userprofile.isKmhAdmin:
        data = get_queue()
    else:
        data = get_queue(request.user.userprofile.selectedClientId)

    for jobqueue in data:
        try:
            if jobqueue['state'] != 'finished':
                jobqueue['start_time'] = datetime.now()
                jobqueue['end_time'] = datetime.now()
                jobqueue['run_time'] = '0 min 0 sec'
            jobqueue['file_name'] = Object.objects.get(pk=jobqueue.get('object_id')).name
        except Object.DoesNotExist:
            Log.exception("Transcode is returning an Object with {pk} that doesn't exist ".format(pk=jobqueue.get('object_id')))

    serializer = serializers.RealTimeTranscodeSerializer(data=data, many=True)

    if not serializer.is_valid():
        return Response(status=status.HTTP_400_BAD_REQUEST)

    return Response(data=serializer.data)

class NoModelBaseViewSet(viewsets.GenericViewSet):

authentication_classes = [OAuth2Authentication, SessionAuthentication]
pagination_class = pagination.PageNumberPagination
filter_backends = (
    filters.OrderingFilter,
    DjangoFilterBackend,
    filters.SearchFilter,
)

extra_serializers = None
"""
    Look for serializer class in self.extra_serializers, which
    should be a dict mapping action name (key) to serializer class (value),
    i.e.:

    class MyViewSet(BaseViewSet, ViewSet):
        serializer_class = MyDefaultSerializer
        extra_serializers = {
           'list': MyListSerializer,
           'my_action': MyActionSerializer,
        }

        @action
        def my_action:
            ...

    If there's no entry for that action then just fallback to the regular
    get_serializer_class lookup: self.serializer_class, DefaultSerializer.

    """
extra_model_permissions = None

def get_serializer_class(self):
    default_serializer_class = super(NoModelBaseViewSet, self).get_serializer_class()
    if self.extra_serializers is None:
        return default_serializer_class
    return self.extra_serializers.get(self.action, default_serializer_class)