Created question in FIWARE Q/A platform on 28-04-2015 at 15:04
Please, ANSWER this question AT http://stackoverflow.com/questions/29921471/fiware-oauth2-authentication-in-node-js

Question:
FIWARE OAuth2 Authentication in Node JS

Description:
I'm trying to authenticate users in Fiware from Node JS.
I've created a server code that calls Oauth2 and when running it, it redirect you to fiware page, but when logging in Fiware shows nothing, and then when checking /user_info page it gives access token is null

here is my config.js:
$

var config=require('config');
config.idmURL = 'http://account.lab.fiware.org';
config.client_id = '2456';
config.client_secret = '12466';
config.callbackURL = 'http://localhost/login';

module.exports = config;

$
The oauth2.js file is the one from : https://github.com/ging/oauth2-example-client/blob/master/oauth2.js

The code that calls Oauth2 is the following:
$

/**

• Module dependencies.
  */

var express = require('express')
, routes = require('./routes')
, user = require('./routes/user')
, http = require('http')
, path = require('path');
var OAuth2 = require('./oauth2').OAuth2;
var config = require('./config');
var cookieparser= require('cookie-parser');
var expresssession= require('express-session');

var app = express();
app.use(cookieparser());
app.use(expresssession({
secret: "257a57604cb5037dcfc2d42127e1104cb705f92344ff74aabadf14d0248cbe266d3e7d567bf7068645668add108a459b5d9af1917ddc6a47cae82a7a9798ae9d"
}));

app.configure(function(){
app.set('port', process.env.PORT || 13299);
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
});

//code I got from http://www.hanselman.com/blog/WebMatrixAndNodejsTheEasiestWayToGetStartedWithNodeOnWindows.aspx
/*module.exports = function (app)
{
app.get('/', function (req, res)
{
res.render('index',

{ message: 'Welcome to my site!' }

);
});
app.get('/about', function (req, res)

{ res.render('about'); }

);
}*/
app.configure('development', function(){
app.use(express.errorHandler());
});

//app.get('/', routes.index);
app.get('/users', user.list);

http.createServer(app).listen(app.get('port'), function(){
console.log("Express server listening on port " + app.get('port'));
});

// .....
// Creates oauth library object with the config data
var oa = new OAuth2(config.client_id,
config.client_secret,
config.idmURL,
'/oauth2/authorize',
'/oauth2/token',
config.callbackURL);

// Handles requests to the main page
app.get('/', function (req, res)
{

// If auth_token is not stored in a session cookie it sends a button to redirect to IDM authentication portal
if (!req.session.access_token)

{ res.send("Oauth2 IDM Demo.<br><br><button onclick='window.location.href=\"/auth\"'>Log in with FI-WARE Account</button>"); // If auth_token is stored in a session cookie it sends a button to get user info }

else

{ res.send("gghhhhhhhhhhhh"); res.send("Successfully authenticated. <br><br> Your oauth access_token: " + /*req.session.access_token + */"<br><br><button onclick='window.location.href=\"/user_info\"'>Get my user info</button>"); }

});

// Handles requests from IDM with the access code
app.get('/login', function (req, res)
{

res.end(req.query.code + "Hello Http, This is the server responding ............");

// Using the access code goes again to the IDM to obtain the access_token
oa.getOAuthAccessToken(req.query.code, function (e, results)

{ // Stores the access_token in a session cookie req.session.access_token = results.access_token; res.end("Hello Http, This is the server responding"); res.send("from inside /login code"); res.redirect('/'); }

);
});

// Redirection to IDM authentication portal
app.get('/auth', function (req, res)
{
var path = oa.getAuthorizeUrl();
res.redirect(path);
});

// Ask IDM for user info
app.get('/user_info', function (req, res)
{
var url = config.idmURL + '/user/';
if (req.session.access_token == null)

{ res.send("access token is null"); }

// Using the access token asks the IDM for the user info
oa.get(url, req.session.access_token, function (e, response)

{ //res.end("hiiiiiiiiiiii5555444"); var user = JSON.parse(response); res.send("Welcome " + user.displayName + "<br> Your email address is " + user.email + "<br><br><button onclick='window.location.href=\"/logout\"'>Log out</button>"); }

);
});

// Handles logout requests to remove access_token from the session cookie
app.get('/logout', function(req, res){

req.session.access_token = undefined;
res.redirect('/');
});

$

when running it keeps giving access_token is null