Hi 

I was able to request for the token.

About the function you mentioned.I have few question as i was unable to 
retrieve contacts.

I cound't understand the following.  
req.user.identities[0].provider?? 

I appreciate your help. 

function getContactsFromGoogleApi (req, res, next) {
    if(req.user.identities[0].provider !== 'google-oauth2') return next();
    request.get({
        url: 'https://www.google.com/m8/feeds/contacts/default/full',
        qs: { 
          alt:           'json', 
          'max-results':  1000,
          'orderby':     'lastmodified'
        },
        headers: { 
          'Authorization': 'OAuth ' + req.user.identities[0].access_token,
          'GData-Version': '3.0'
        }
      }, function (err, resp, body) {
        if(resp.statusCode === 401){
          return res.redirect('/login');
        }
        var feed = JSON.parse(body);

        var users = feed.feed.entry.map(function (c) {
          var r =  {};
          if(c['gd$name'] && ['gd$fullName']){
            r.name = c['gd$name']['gd$fullName']['$t'];
          }
          if (c['gd$email'] && c['gd$email'].length > 0) {
            r.email    = c['gd$email'][0]['address'];
            r.nickname = r.email;//c['gd$email'][0]['address'].split('@')[0];
          }
          if(c['link']){
            var photoLink = c['link'].filter(function (link) {
              return link.rel == 
'http://schemas.google.com/contacts/2008/rel#photo' && 
                     'gd$etag' in link; 
            })[0];
            if(photoLink) {
              r.picture = '/users/photo?l=' + 
encodeURIComponent(photoLink.href);
            } else if (r.email) {
              r.picture = gravatar.url(r.email, {
                s: 40, 
                d: 
"https://ssl.gstatic.com/s2/profiles/images/silhouette80.png"});
            }
          }
          return r;
        }).filter(function (u) {
          return !!u.email &&                  //we can only give access to 
persons with email at this point
                 !~u.email.indexOf('@reply.');  //adress with @reply. are 
usually temporary reply address for forum kind of websites.
        });

        res.json(users);
      });
  }

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