mixins.py

class LoginRequiredMixin(object):
    @method_decorator(login_required)
    def dispatch(self, request, *args, **kwargs):
        return super().dispatch(request, *args, **kwargs)

class OnlySelectedUsersMixin(LoginRequiredMixin):
    selectedUsers = tuple()

    def dispatch(self, request, *args, **kwargs):
        if hasattr(request.user, 'person') and (request.user.person in self.selectedUsers or kwargs.get('permit')):
            return super().dispatch(request, *args, **kwargs)
        raise PermissionDenied

class OnlySelectedUsersOrSuperuserMixin(OnlySelectedUsersMixin):
    def dispatch(self, request, *args, **kwargs):
        try:
            return super().dispatch(request, *args, **kwargs)
        except PermissionDenied:
            if request.user.is_superuser:
                return super().dispatch(request, *args, permit=True, **kwargs)
            raise PermissionDenied

class OnlyNotSelectedUsersMixin(LoginRequiredMixin):
    selectedUsers = tuple()

    def dispatch(self, request, *args, **kwargs):
        if hasattr(request.user, 'person') and not request.user.person in self.selectedUsers:
            return super().dispatch(request, *args, **kwargs)
        raise PermissionDenied