IMAP access to Gmail inbox with XOAUTH

I'm following the example, I already have authorized my application (=obtained the access token) but trying to access the inbox results in this:

  21:14.12 > NDIB1 AUTHENTICATE XOAUTH
  21:14.17 < + 
  21:14.17 write literal siz开发者_如何学Pythone 480
  21:14.74 < NDIB1 NO [ALERT] Invalid credentials (Failure)
  21:14.74 NO response: [ALERT] Invalid credentials (Failure)

This is the code:

import xoauth
import oauth2 as oauth
import imaplib

consumer = oauth.Consumer('anonymous', 'anonymous')
access_token = oauth.Token(my_access_token, my_access_token_secret)
user = my_gmail_address
proto = "imap" # is it right???
xoauth_requestor_id = user # and this???
xoauth_string = xoauth.GenerateXOauthString(consumer, access_token, user, proto, xoauth_requestor_id, '', '')
conn = imaplib.IMAP4_SSL('imap.googlemail.com')
conn.debug = 4
conn.authenticate('XOAUTH', lambda x: xoauth_string)
conn.select('INBOX')
print conn.list()

It fails on the conn.authenticate() call. Any idea?

The example above uses "anonymous" for authentication but, you must set "Consumer Key" and "Consumer Secret" to the values you've already set in "Manage Domains" control panel at:

https://accounts.google.com/ManageDomains

Example:

consumer = oauth.Consumer(<OAuth-Consumer-Key>, <OAuth-Consumer-Secret>)