Fixing JSON key service account assertions in Python3.

[dhermes]

Fixes #125.

NOTE: '%s.%s' does not behave the same between versions and should be removed throughout this library.

I will be following this up with a set of regression tests (hopefully some of which will fail) and we can assess the damage of other uses of '%s'.

[dhermes]

To verify:

from __future__ import print_function

from oauth2client import client
import httplib2


SEPARATOR = '=' * 60
SCOPES = ('https://www.googleapis.com/auth/userinfo.email',)
CREDENTIALS_FILENAME = '/path/to/credentials.json'

CREDENTIALS = client._get_application_default_credential_from_file(
    CREDENTIALS_FILENAME).create_scoped(SCOPES)


print('oauth2client.client.__file__ (make sure this is local):')
print(repr(client.__file__))
print(SEPARATOR)

print('CREDENTIALS.refresh_token before:')
print(repr(CREDENTIALS.refresh_token))
print('CREDENTIALS.access_token before:')
print(repr(CREDENTIALS.access_token))
print(SEPARATOR)

HTTP = httplib2.Http()
result = CREDENTIALS.refresh(HTTP)

print('refresh result:')
print(repr(result))
print(SEPARATOR)

print('CREDENTIALS.refresh_token after:')
print(repr(CREDENTIALS.refresh_token))
print('CREDENTIALS.access_token after:')
print(repr(CREDENTIALS.access_token))

[dhermes]

For me this results in outputs

Python 2

oauth2client.client.__file__ (make sure this is local):
'/home/dhermes/oauth2client/oauth2client/client.pyc'
============================================================
CREDENTIALS.refresh_token before:
None
CREDENTIALS.access_token before:
None
============================================================
refresh result:
None
============================================================
CREDENTIALS.refresh_token after:
None
CREDENTIALS.access_token after:
u'ya29.EAG...'

Python 3

oauth2client.client.__file__ (make sure this is local):
'/home/dhermes/oauth2client/oauth2client/client.py'
============================================================
CREDENTIALS.refresh_token before:
None
CREDENTIALS.access_token before:
None
============================================================
refresh result:
None
============================================================
CREDENTIALS.refresh_token after:
None
CREDENTIALS.access_token after:
'ya29.EAH...'

[dhermes]

@craigcitro PTAL

[dhermes]

w00t.