How to authenticate with Google Spreadsheets API using Python client / discovery service?

Question

I'm using Python 2.7 and the client library for Google API which I am trying to use to get authenticated access to Spreadsheets like so:

# sa == Service Account
scope = 'https://spreadsheets.google.com/feeds'
credentials = SignedJwtAssertionCredentials(sa_id, sa_key, scope)
http = httplib2.Http()
http = credentials.authorize(http)
build('spreadsheets', 'v2', http=http)

Note this is from a client script and not in Google App Engine. The output of the above is:

File "/Library/Python/2.7/site-packages/apiclient/discovery.py", line 196, in build version)) apiclient.errors.UnknownApiNameOrVersion: name: spreadsheets version: v2

I know I'm doing this wrong, but I'm having trouble finding any examples of authenticating without using ClientLogin and/or the .NET/Java client libraries.

[UPDATE] The answer may be in the following source example, but I noticed on skimming it that it still uses email/password: https://code.google.com/p/gdata-python-client/source/browse/src/gdata/spreadsheet/service.py

Answer 1

The old Python gdata service libraries support ClientLogin, AuthSub and OAuth 1.0 authentication. All of which have been deprecated. If you wish to use the OAuth 2.0 Service Account credentials you'll need to hack something together like:

def buildSpreadsheetService():
  scope = 'https://spreadsheets.google.com/feeds'
  credentials = SignedJwtAssertionCredentials(sa_id, sa_key, scope)
  http = httplib2.Http()
  http = credentials.authorize(http)
  build('drive', 'v2', http=http)
  sheets = gdata.spreadsheet.service.SpreadsheetsService()
  sheets.additional_headers = {'Authorization': 'Bearer %s' % http.request.credentials.access_token}
  return sheets