Google Data API authentication

Question

I am trying to get my Django app (NOT using Google app engine) retrieve data from Google Contacts using Google Contacts Data API. Going through authentication documentation as well as Data API Python client docs

First step (AuthSubRequest) which is getting the single-use token works fine. The next step(AuthSubSessionToken), which is upgrade single-use token to a session token. The python API call UpgradeToSessionToken() simply didn't work for me it gave me NonAuthSubToken exception:

gd_client = gdata.contacts.service.ContactsService()
gd_client.auth_token = authsub_token
gd_client.UpgradeToSessionToken()

As an alternative I want to get it working by "manually" constructing the HTTP request:

url = 'https://www.google.com/accounts/AuthSubSessionToken'
headers = {
               'Content-Type': 'application/x-www-form-urlencoded',
               'Authorization': 'AuthSub token=' + authsub_token,
               'User-Agent': 'Python/2.6.1',
               'Host': 'https://www.google.com', 
               'Accept': 'text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2',
               'Connection': 'keep-alive',
           }
req = urllib2.Request(url, None, headers)
response = urllib2.urlopen(req)

this gives me a different error:

HTTP Error 302: The HTTP server returned a redirect error that would lead to an infinite loop. The last 30x error message was: Moved Temporarily

What am I doing wrong here? I'd appreciate help/advice/suggestions with either of the methods I am trying to use: Python API call (UpgradeToSessionToken) or manually constructing HTTP request with urllib2.

Answer 1

According to the 2.0 documentation here there is a python example set...

Running the sample code

A full working sample client, containing all the sample code shown in this document, is available in the Python client library distribution, under the directory samples/contacts/contacts_example.py.

The sample client performs several operations on contacts to demonstrate the use of the Contacts Data API.

Hopefully it will point you in the right direction.

Answer 2

I had a similar issue recently. Mine got fixed by setting "secure" to "true".

  next = 'http://www.coolcalendarsite.com/welcome.pyc'
  scope = 'http://www.google.com/calendar/feeds/'
  secure = True
  session = True
  calendar_service = gdata.calendar.service.CalendarService()

Answer 3

There are four different ways to authenticate. Is it really that important for you to use AuthSub? If you can't get AuthSub to work, then consider the ClientLogin approach. I had no trouble getting that to work.