SSO on discourse with gitlab account?

Platform & services
1

Would it be possible to have single sign on in this discourse instance using the gitlab account ? It would avoid a new login/password pair.

2

This should be possible via the Gitlab OAuth plugin but, AFAIK, this plugin doesn’t work with already existing accounts. You will be asked to create a new user with the email from GitLab.

3

Ok, this is probably not a big deal since there are only a few existing accounts for now. Lets do it before opening the service more widely, so that new users can benefit from it.

4

I just enabled Github OAuth because this provider is available out of the box in Discourse. I am going to see how to do it with our Gitlab instance.

5

It works! I installed the required plugin (discourse-omniauth-gitlab).

6

I got the following error when trying:

An error has occurred

The requested scope is invalid, unknown, or malformed.

However, I already have a discourse account with the same login, so it may be come from that. Can anybody else give a try and report here ?

7

A colleague who does not have a Discourse account yet encountered the same issue this morning. I am going to investigate.

8

It works now. If you already have an account on Discourse and if its email matches the email of the Gitlab account, these two accounts are merged. Otherwise, a new account is created, using a number as suffix.

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