User API for Google App Engine far too restrictive?

Looking at the Google App Engine API, it seems that despite all its 开发者_如何学JAVAgreat features, the User API is extremely limiting. It seems you can only authenticate people who have a Google account, or use an OpenID account, or via some OAuth kung fu (handshaking with a Facebook account etc).

This appears to be a major stumbling block for anyone who wants a proprietary user base by creating user accounts within the application. In short, I don't want my users to have to use or create a Google account to access my app.

Has anyone else come across this limitation and has it been a deal breaker for using the GAE? Am I missing something? It is possible to deploy my own Spring based security etc within the app and use my own User API? Comments on this issue greatly appreciated. Thanks.

You're free to completely ignore the Users API and implement your own authentication system, as you would in any other hosting environment. Nothing about App Engine prevents you from doing so.

The Users API is just there as a convenience, in case you'd like to spare yourself the effort of re-implementing everything, and spare your users the inconvenience of filling out another sign up form and remembering another set of credentials.

You can always implement your own user management system.

In my application I have used spring-security for this purpose. spring security 3.0.1 works perfectly fine with app engine 1.3.5. There may occur some issues integrating other versions of both. I found below links extremely useful :

• http://www.google-app-engine.com/blog/post/Spring-security-fix-for-google-app-engine.aspx.
• http://www.dotnetguru2.org/bmarchesson/index.php?p=1100
• http://groups.google.com/group/google-appengine-java/browse_thread/thread/964e7f5e42840d9c