Implemented Nextcloud OAuth2 Hack References Issue #1874

[bogie]

In reference to: #1874 (comment)

I finally got my dev environment running, applied the change and tested:

Login works, however the profile data is not being applied. Is there some sort of additional logic we need to implement in oidc_server.js similarly to ldap auth?

---

This change is 

[xet7]

@bogie

I think those details depends in what settings those should be mapped to:
https://github.com/wekan/wekan/wiki/OAuth2#3-snap-settings-change-to-it-from-above-client-id-secret-server-url-and-web-origin-namespace-for-rules-function-above

[bogie]

Hmm, it gets correctly mapped to the serviceData object and also to

options: { profile: profile }

however it does not appear to get applied to the user's profile correctly. I do not understand where OAuth.registerSerivce() gets called from.

Maybe the problem is due to the fact that the admin user was created by oauth2. I will do some more testing.