Oauth or Authsub for appengine operations. For example I want to deploy an app on appengine for a user without asking him his userid and a password. Use case:

Oauth or Authsub for appengine operations. For example I want to deploy an app on appengine for a user without asking him his userid and a password. Use case: User comes to a site. Search for available applications to install. Click install; give permission, application installed to his appengine account.