gistfile1.py

GOOGLE_CLIENT_ID = '828226820573-...'
GOOGLE_CLIENT_SECRET = 'GjVcxp...'
GOOGLE_OAUTH_URL = 'https://accounts.google.com/o/oauth2/auth?scope=https%%3A%%2F%%2Fwww.googleapis.com%%2Fauth%%2Fuserinfo.email+https%%3A%%2F%%2Fwww.googleapis.com%%2Fauth%%2Fuserinfo.profile&state=&redirect_uri=%s&response_type=code&client_id=%s' # add gmail scopes...?
GOOGLE_TOKEN_URL = 'https://accounts.google.com/o/oauth2/token'
GOOGLE_REDIRECT_URL = 'http://%s/auth/google/callback' % HOST

...


urlpatterns = patterns(...,
    url(r'^auth/google/login$', '_login'),
    url(r'^auth/google/callback$', 'callback'),
)

...

def _login(request):
    url = settings.GOOGLE_OAUTH_URL % (settings.GOOGLE_REDIRECT_URL, settings.GOOGLE_CLIENT_ID)
    return HttpResponseRedirect(url)


def callback(request):
    if 'error' in request.GET:
        return HttpResponseRedirect('/')
        
    code = request.GET['code']
    post = {
        'code': code,
        'client_id': settings.GOOGLE_CLIENT_ID,
        'client_secret': settings.GOOGLE_CLIENT_SECRET,
        'redirect_uri': settings.GOOGLE_REDIRECT_URL,
        'grant_type': 'authorization_code',
    }
    token = requests.post(settings.GOOGLE_TOKEN_URL, post).json()['access_token']
    user = requests.get('https://www.googleapis.com/oauth2/v1/userinfo?access_token=' + token).json()
    
    ....user...

    return HttpResponseRedirect(....)