app.js

var express = require('express');
var path = require('path');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var config = require('./config');
var passport = require('passport')
var GitHubStrategy = require('passport-github').Strategy
var session = require('express-session')
var _ = require('lodash');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(session({
  secret: config.SESSION_KEY,
  resave: false,
  saveUninitialized: false
}))
app.use(express.static(path.join(__dirname, 'public')));

// Github authentication required
passport.serializeUser(function(user, done) {
  done(null, user);
});
passport.deserializeUser(function(obj, done) {
  done(null, obj);
});
passport.use(new GitHubStrategy({
    clientID: config.GITHUB_CLIENT_ID,
    clientSecret: config.GITHUB_CLIENT_SECRET,
    callbackURL: config.URL + '/auth/github/callback',
    scope: 'repo'
  },
  function(accessToken, refreshToken, profile, done) {
    process.nextTick(function () {
      var user = _.pick(profile, ["id", "displayName", "username", "profileUrl"])
      user.token = accessToken

      return done(null, user);
    })
  }
));
app.use(passport.initialize());
app.use(passport.session());

// auth routes
app.get('/auth/github', passport.authenticate('github'))
app.get('/auth/github/callback', passport.authenticate('github'), function(req, res) {
  res.redirect(req.session.returnTo || "/")
})

// routes
app.use('/', require('./routes/index'));

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  err.status = err.status || 500;
  res.status(err.status);

  if (!err.status || err.status >= 500) {
    console.error(err.stack || err)
  }

  var accept = req.headers.accept || '';
  if (~accept.indexOf('html')) {
    res.render('error', {
      error: err
    });
  } else if (~accept.indexOf('json')) {
    res.setHeader('Content-Type', 'application/json');
    res.json({
      error: err.message
    })
  } else {
    res.send(err.message);
  }
});

module.exports = app;