Error "Action not implemented" with Nextcloud as OAuth2-Provider

[fanningert]

Hi,
It looks like everythink is working. But after granting access, I get following error.

Internal Error: Action not implemented

My way to configure NextCloud and Kanboard.

In Nextcloud I add a OAuth-Client.
Name: nextcloud.example.com
Redirect URL: https://kanboard.example.com/?controller=OAuthController&action=handler&plugin=OAuth2

In Kanboard I set following values in the fields for the OAuth Settings.
Client-ID: Copy from NextCloud
Client-Secret: Copy from NextCloud
Authorize URL: https://nextcloud.example.com/index.php/apps/oauth2/authorize
Token URL: https://nextcloud.example.com/index.php/apps/oauth2/api/v1/token
User API URL: https://nextcloud.example.com/index.php/ocs/v1.php/cloud/users
Username Key: ocs.data.id
Name Key: ocs.data.displayname
Email Key: ocs.data.email
User ID Key: ocs.data.id
Allow Account Creation: X
Allow account creation only for those domains: example.com

Please tell me if you need more informations.

Request-List:

https://kanboard.example.com/?controller=OAuthController&action=handler&plugin=OAuth2
https://nextcloud.example.com/index.php/apps/oauth2/authorize?response_type=code&client_id=xxxxxx&redirect_uri=https%3A%2F%2Fkanboard.example.com%2F%3Fcontroller%3DOAuthController%26action%3Dhandler%26plugin%3DOAuth2&scope=&state=xxxxxx

Now I see the NextCloud authorize screen and I click on it

https://nextcloud.example.com/index.php/login/flow
https://kanboard.example.com/?controller=OAuthController&action=handler&plugin=OAuth2?state=xxxxxx&code=xxxxxx

On this Request I get error message.

[poVoq]

@fanningert
Did you ever get this to work?
I tried following some other tutorials that are similar, see (https://help.nextcloud.com/t/nextcloud-oidc-oauth2-authentification/14852/11), but I also get an error.

Differences I see are:
Name Key: ocs.data.display-name (with a - )
User API URL: https://nextcloud.example.com/ocs/v2.php/cloud/user?format=json
Edit: User API URL: https://nextcloud.example.com/index.php/ocs/v2.php/cloud/user?format=json is the same.

Edit: ah, and that I didn't put the index.php in the authorize and token URL... with that I can go though the auth process on the Nextcloud side of things, but upon redirection to Kanboard I also get the Internal Error: Action not implemented message on a white page.

[RussellAult]

I did a little poking around, and I'm 99% sure this is actually a bug in Nextcloud: nextcloud/server#17885.

In the meantime, you should be able to work around this issue within Kanboard by enabling URL rewriting, which will give you a Callback URL that doesn't already have a '?' in it (you'll need to remove and re-add Kanboard as an OAuth2 client with Nextcloud after you'll do this).

[sunjam]

I did a little poking around, and I'm 99% sure this is actually a bug in Nextcloud: nextcloud/server#17885.

That issue was resolved. 👍 Has anyone tested since?