REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.TokenAuthentication',
        'rest_framework.authentication.BasicAuthentication',
        'rest_framework.authentication.SessionAuthentication',
    ),
}

class ContactViewSet(viewsets.ModelViewSet):
    queryset = Contact.objects.all()
    serializer_class = ContactSerializer
    permission_classes = (IsAuthenticated,)

    def perform_create(self, serializer):
        serializer.save(user_id=self.request.user)

class AdminAuthenticationPermission(permissions.BasePermission):
    ADMIN_ONLY_AUTH_CLASSES = [rest_framework.authentication.BasicAuthentication, rest_framework.authentication.SessionAuthentication]

    def has_permission(self, request, view):
        user = request.user
        if user and user.is_authenticated():
            return user.is_superuser or
                not any(isinstance(request._authenticator, x) for x in self.ADMIN_ONLY_AUTH_CLASSES)
        return False

class ContactViewSet(viewsets.ModelViewSet):
    queryset = Contact.objects.all()
    serializer_class = ContactSerializer
    permission_classes = (IsAuthenticated, AdminAuthenticationPermission,)