title: Oauth2 authentication for installed applications using service account flow
body: <p>I've successfully built a ruby script and a mac app that use service account credentials to authenticate (without user interaction) to google cloud storage and upload/download objects.</p>
  
  <p>I now need to perform similar actions on an iOS device. Is it possible to use installed application credentials to authenticate <em>still without user interaction?</em></p>
  
  <p>If it's possible or has been done, can you please provide an example or point me in the right direction.</p>
  
  <p>Thanks!</p>