Can you use openID as a single sign-on for an iphone app?

Question

I'm looking to implement Single Sign On for a native iOS app whereby logging in with this single sign on gives the mobile device authenticated access to our private service in a fashion that is somewhat similar to oauth.

The marketing text on openid.net suggests that "OpenID is a safe, faster, and easier way to log in to web sites.". Emphasis on web sites.

So the question is: Is it reasonable to implement openID on a native mobile app, or is openID only for web sites.

I've been scouring the web and I'm not finding a way to fit openID in as my login option.

Answer 1

The best way to do this seems to be to use a UIWebView and render a log in page from your site in it. Once the user logs in, they'll be redirected back to your site and have an auth cookie, which you can extract, store, and send on subsequent HTTP requests to the server.

See this, which has a sample code link at the bottom.

Answer 2

OpenID sends its messages as a series of HTTP requests and responses. Your app and the openid provider must communicate to each other via HTTP post, and you will need to redirect the user to corresponding URLs, and have a URL for the user to be redirected back to. As such, you will probably find it difficult to integrate with your app.