How to use custom URI schemes in the redirect URI for native clients in Google OAuth Flows

[Naveen Agarwal]

How to use custom URI schemes in the redirect URI for native clients in Google OAuth Flows

Here is a technique to improve the flow when an iOS app wants to get an OAuth 2 token for a google account.  You send the user to the browser for approval, and the browser redirects back to a URI you supply.  The trick is to register and use a custom URI scheme for that redirect.

As an example, for the following bundle and client id:
     bundle id: com.example.myapp
     client id: 1234-abc.apps.googleusercontent.com
The client can use either of the following custom schemes:
     com.example.myapp:/oauth2Callback
     com.googleusercontent.apps.1234-abc:/oauth2callback

To use custom URI schemes:
 
Create a client id of type iOS (installed application) in the API console. Enter Bundle ID (Wildcards are supported e.g. com.mycompany.app1.*).
In your app register your custom URI scheme and handle the request. Extract the code and exchange it for a refresh token and store it.

More details: http://goo.gl/uax5i

G+ post: https://plus.google.com/111487187212167051233/posts/AztHNnQh7w6