I would like to have XenForo use my custom built website's authentication system. My website is a OAuth2 Provider, so I feel like this should be fairly simple since Twitter/G+/Facebook are already there.
While I appreciate your help, I was only able to find sources for [bd] API which requires the OAuth2 Provider to be another XenForo installation. My OAuth2 Provider is not a XenForo install, it is a custom built application that follows the OAuth2 standard.
Good idea to solicit in the Request forum ... but people don't check it that often ....
I know Joomla has OAuth2 authentication. Joomla has Jfusion plugin that can integrate Xenforo with Joomla. I'm not sure the Xenforo Jfusion plugin works with the latest version of Jfusion. Jfusion + Joomla + RoR + Xenforo sounds like a slow setup anyway.
@xfrocks would probably be the ideal person for an addon like this. But he's probably busy. Try xfrocks.com. He is the author of [bd]API.