Google API OAuth2 persistent token

gdata_oauth2.py

# Example with Contacts API

import atom.http_core
import gdata.contacts.client
import gdata.gauth

auth_kwargs = {
    'client_id': 'clielnt-id-xxx.apps.googleusercontent.com',  # CHANGEME (see API auth console)
    'client_secret': 'client-secret-xxx',  # CHANGEME (see API auth console)
    'scope': 'https://www.google.com/m8/feeds',  # CHANGEME (see API reference)
    'user_agent': 'Mozila/5.0',
}

if __name__ == '__main__':
    client = gdata.contacts.client.ContactsClient(source='ContactsClient')
    try:
        with open('gdata.auth.contacts') as f:
            token = gdata.gauth.token_from_blob(f.read())
        token = gdata.gauth.OAuth2Token(refresh_token=token.refresh_token, **auth_kwargs)
    except IOError:
        token = gdata.gauth.OAuth2Token(**auth_kwargs)
        print(token.generate_authorize_url(redirect_uri='http://localhost'))
        url = raw_input("Paste redirect URL: ")
        url = atom.http_core.ParseUri(url)
        token.get_access_token(url.query)
        with open('gdata.auth.contacts', 'w') as f:
            f.write(gdata.gauth.token_to_blob(token))

    token.authorize(client)