Account: add a dashboard url endpoint.

This lets servers share a dashboard url with clients so that they in
turn can present clients with a settings dashboard.
We currently use it on the main server, but self-hosted servers may
also benefit from it for letting users manage some of their settings
(e.g. 2FA).

django_etebase/app_settings.py

@@ -61,6 +61,13 @@ class AppSettings:
             return self.import_from_str(func)
         return None
 
+    @cached_property
+    def DASHBOARD_URL_FUNC(self):  # pylint: disable=invalid-name
+        func = self._setting("DASHBOARD_URL_FUNC", None)
+        if func is not None:
+            return self.import_from_str(func)
+        return None
+
     @cached_property
     def CHUNK_PATH_FUNC(self):  # pylint: disable=invalid-name
         func = self._setting("CHUNK_PATH_FUNC", None)

django_etebase/views.py

@@ -783,6 +783,18 @@ class AuthenticationViewSet(viewsets.ViewSet):
 
         return Response({}, status=status.HTTP_200_OK)
 
+    @action_decorator(detail=False, methods=['POST'], permission_classes=BaseViewSet.permission_classes)
+    def dashboard_url(self, request, *args, **kwargs):
+        get_dashboard_url = app_settings.DASHBOARD_URL_FUNC
+        if get_dashboard_url is None:
+            raise EtebaseValidationError('not_supported', 'This server doesn\'t have a user dashboard.',
+                                         status_code=status.HTTP_400_BAD_REQUEST)
+
+        ret = {
+            'url': get_dashboard_url(request, *args, **kwargs),
+        }
+        return Response(ret)
+
 
 class TestAuthenticationViewSet(viewsets.ViewSet):
     allowed_methods = ['POST']