Hi all,

It has been a long time, but I the auth-source-xoauth2 package has been finally open-sourced:

https://github.com/ccrusius/auth-source-xoauth2

I haven't had the time to add it to MELPA yet, but for those trying to find a way to interface with two-factor authentication on GMail it should be ready to go. I have been using it for some time to interface Gnus to GMail.

Best,

-- 
Cesar Crusius