There’s a task requesting OpenID authentication that is currently set to wontfix, mostly because it seems there’s no real justification for it? The unfortunate thing is that I’d really like to make use of Ubuntu One’s authentication mechanism, which appears to be using OpenID and OAuth1. Any chance of this getting integrated or some other solution out there?
OpenID and OAuth1 are two different protocols.
No chance for OpenID - I’m guessing it’s even less useful now than it was in 2013.
OAuth1 is sort-of-supported, in the sense that there appear to exist 3 OAuth1 providers implemented (JIRA, Bitbucket and Twitter), so if UbuntuOne supports OAuth1, you can copy one of these providers and adapt it to Ubuntu.