text: var express = require('express');
  var passport = require('passport');
  var util = require('util');
  var session = require('express-session');
  var bodyParser = require('body-parser');
  var methodOverride = require('method-override');
  var GitHubStrategy = require('passport-github2').Strategy;
  var partials = require('express-partials');
  
  
  var GITHUB_CLIENT_ID = "--insert-github-client-id-here--";
  var GITHUB_CLIENT_SECRET = "--insert-github-client-secret-here--";
  
  
  // Passport session setup.
  //   To support persistent login sessions, Passport needs to be able to
  //   serialize users into and deserialize users out of the session.  Typically,
  //   this will be as simple as storing the user ID when serializing, and finding
  //   the user by ID when deserializing.  However, since this example does not
  //   have a database of user records, the complete GitHub profile is serialized
  //   and deserialized.
  passport.serializeUser(function(user, done) {
    done(null, user);
  });
  
  passport.deserializeUser(function(obj, done) {
    done(null, obj);
  });
  
  
  // Use the GitHubStrategy within Passport.
  //   Strategies in Passport require a `verify` function, which accept
  //   credentials (in this case, an accessToken, refreshToken, and GitHub
  //   profile), and invoke a callback with a user object.
  passport.use(new GitHubStrategy({
      clientID: GITHUB_CLIENT_ID,
      clientSecret: GITHUB_CLIENT_SECRET,
      callbackURL: "http://127.0.0.1:3000/auth/github/callback"
    },
    function(accessToken, refreshToken, profile, done) {
      // asynchronous verification, for effect...
      process.nextTick(function () {
        
        // To keep the example simple, the user's GitHub profile is returned to
        // represent the logged-in user.  In a typical application, you would want
        // to associate the GitHub account with a user record in your database,
        // and return that user instead.
        return done(null, profile);
      });
    }
  ));
  
  
  
  
  var app = express();
  
  // configure Express
  app.set('views', __dirname + '/views');
  app.set('view engine', 'ejs');
  app.use(partials());
  app.use(bodyParser.urlencoded({ extended: true }));
  app.use(bodyParser.json());
  app.use(methodOverride());
  app.use(session({ secret: 'keyboard cat', resave: false, saveUninitialized: false }));
  // Initialize Passport!  Also use passport.session() middleware, to support
  // persistent login sessions (recommended).
  app.use(passport.initialize());
  app.use(passport.session());
  app.use(express.static(__dirname + '/public'));
  
  
  app.get('/', function(req, res){
    res.render('index', { user: req.user });
  });
  
  app.get('/account', ensureAuthenticated, function(req, res){
    res.render('account', { user: req.user });
  });
  
  app.get('/login', function(req, res){
    res.render('login', { user: req.user });
  });
  
  // GET /auth/github
  //   Use passport.authenticate() as route middleware to authenticate the
  //   request.  The first step in GitHub authentication will involve redirecting
  //   the user to github.com.  After authorization, GitHub will redirect the user
  //   back to this application at /auth/github/callback
  app.get('/auth/github',
    passport.authenticate('github', { scope: [ 'user:email' ] }),
    function(req, res){
      // The request will be redirected to GitHub for authentication, so this
      // function will not be called.
    });
  
  // GET /auth/github/callback
  //   Use passport.authenticate() as route middleware to authenticate the
  //   request.  If authentication fails, the user will be redirected back to the
  //   login page.  Otherwise, the primary route function will be called,
  //   which, in this example, will redirect the user to the home page.
  app.get('/auth/github/callback', 
    passport.authenticate('github', { failureRedirect: '/login' }),
    function(req, res) {
      res.redirect('/');
    });
  
  app.get('/logout', function(req, res){
    req.logout();
    res.redirect('/');
  });
  
  app.listen(3000);
  
  
  // Simple route middleware to ensure user is authenticated.
  //   Use this route middleware on any resource that needs to be protected.  If
  //   the request is authenticated (typically via a persistent login session),
  //   the request will proceed.  Otherwise, the user will be redirected to the
  //   login page.
  function ensureAuthenticated(req, res, next) {
    if (req.isAuthenticated()) { return next(); }
    res.redirect('/login')
  }
  