I already did a lot of research on this topic and have implemented a lot of solutions myself.

Including OpenID, Facebook Connect (using the old Rest API and the new Graph OAuth 2.0 API), Sign in with twitter (which has been upgraded to fully qualified OpenID by now as far as I know), and so on...

But what I'm still missing is the perfect all in one solution.

During my research I stumbled about some interesting projects:

But I don't want to rely on an external provider and I would like a free solution as well, so I am not limited in implementation.

I have also seen developers implementing one service after another dutifully following the providers instructions and setting up models and database tables for everything.

Of course this will work but it is a shitload of work and always needs development and changes in your application etc.

What I am looking for is an abstraction layer that takes all the services out there to one standard that can be integrated in my website. Once a new service appears I only want to add one model that deals with the abstraction of that specific provider so I can seamlessly integrate it into my application.

Or better, find an already existing solution that I can just dowonload.

Ideally this abstraction service would be hosted independently from my application so it can be used for several applications and be upgraded independently.

The last of the 3 solutions above looks promising from the concept. Everything is just por

php authentication facebook openid single-sign-on
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