feature request: Make Zulip an OAuth Provider.

[showell]

https://chat.zulip.org/#narrow/stream/127-integrations/topic/Sign.20in.20with.20Zulip/near/1096220 provides an example of a customer who would like Zulip to be an OAuth Provider.

We've had a couple internal projects to build this out, but they both got a little bit stuck due to competing priorities, so I'll make an issue for this.

See #16529 (comment) for our latest in-progress PR.

[showell]

I encourage anybody reading this issue to upvote the top description if you think this is something you would find valuable. Also, feel free to use the comments to provide examples of how you'd use Zulip OAuth Provider features.

[mrchrisadams]

The specific use case I have in mind is for using with the Outline, a really nice open source knowledge base/wiki tool, for folks who want to be able update documentation, onboarding guides, books and so on, and but might not be comfortable using github and pull requests.

But in general, because zulip is the place where interaction and chat happens, being able to link from zulip to some other service is ideal especially if you're not able to provision things like google accounts and so on to people in online communities.

[zulipbot]

Hello @zulip/server-authentication members, this issue was labeled with the "area: authentication" label, so you may want to check it out!

[nooblag]

This would be great! Our desired use case in this instance would be Zulip -> Nextcloud logins.

[sourcebert]

Same here ... Zulip + Nextcloud = perfect match 😀

[bowaggoner]

Same as the above two. Our research group all have Zulip accounts on our instance. I'd like to offer them Nextcloud and let them sign in with their Zulip account. Same for Gitea.