Mobile Registration Request Fails Due UTM Function

[uetuluk (Utku Ege Tuluk)]

I have a question regarding the _record_utm_registration_attribution function inside the registration view.

openedx/edx-platform/blob/4cf314c38b20bb81ed3103dbe2cfac3e95223355/openedx/core/djangoapps/user_authn/views/register.py#L490-L517

We are currently working on implementing a custom registration method on a custom fork based on Maple.3. We also have a custom fork for mobile applications.

There is a problem caused by the function _record_utm_registration_attribution in the following flow:

1. The mobile application sends requests with the HttpOnly cookie.
2. RegistrationCookieConfiguration.current().utm_cookie_name returns empty string ‘’ because we have not set any UTM referred.
3. The _record_utm_registration_attribution function catches the HttpOnly cookie because utm_cookie_name is empty string.
4. It fails because HttpOnly cookie is not in JSON format.

I fixed this problem by adding an additional check to the if-clause.

if user and utm_cookie and utm_cookie_name: 

I would like to ask whether _record_utm_registration_attribution should fail in this case and whether we should change the mobile application. Or is it an edge case that should be handled?

Thank you.