app.js

// global io

const express = require('express');
const path = require('path');
const logger = require('morgan');
const cookieParser = require('cookie-parser');
const bodyParser = require('body-parser');
const passport = require('passport');
const favicon = require('serve-favicon');
const LocalStrategy = require('passport-local').Strategy;
const FacebookStrategy = require('passport-facebook').Strategy;
const session = require('express-session');
const socketio = require('socket.io');
const mongoose = require('mongoose');
const debug = require('debug')('app');

const routes = require('./routes/index');
const users = require('./routes/users');
const courses = require('./routes/courses');

const User = require('./models/User');

require('dotenv').config();

const DB_NAME = process.env.DB_NAME;
const MONGO_PASS = process.env.MONGO_DB_PASS;
const MONGO_HOST = process.env.OPENSHIFT_MONGODB_DB_HOST;
const MONGO_PORT = process.env.OPENSHIFT_MONGODB_DB_PORT;

if (MONGO_HOST) {
  mongoose.connect(`mongodb://admin:${MONGO_PASS}@${MONGO_HOST}:${MONGO_PORT}/${DB_NAME}`);
} else {
  mongoose.connect(`mongodb://localhost/${DB_NAME}`);
}

const app = express();
const io = global.io = app.io = socketio();

io.on('connection', (socket) => {
  debug('Someone connected');

  socket.on('chat message', (msg) => {
    debug(`message: ${msg}`);
    io.emit('chat message', msg);
  });
});

app.use(session({
  secret: process.env.SESSION_SECRET,
  resave: false,
  saveUninitialized: false,
}));

app.use(passport.initialize());
app.use(passport.session());

app.get('*', (req, res, next) => {
  res.locals.user = req.user; // eslint-disable-line no-param-reassign
  next();
});

passport.use(new LocalStrategy((username, password, cb) => {
  User.findOne({ username }, (err, user) => {
    if (err) return cb(err);
    if (!user) return cb(null, false);
    if (user.password !== password) return cb(null, false);
    return cb(null, user);
  });
}));

passport.use(new FacebookStrategy({
  clientID: process.env.FACEBOOK_APP_ID,
  clientSecret: process.env.FACEBOOK_APP_SECRET,
  callbackURL: process.env.FACEBOOK_CALLBACK_URL,
}, (accessToken, refreshToken, profile, cb) => {
  User.findOne({ facebookId: profile.id }, (err, user) => {
    if (err) {
      cb(err);
    } else if (user) {
      cb(err, user);
    }

    const newUser = new User({
      facebookId: profile.id,
      profile,
    });

    newUser.save((newUserError) => {
      if (newUserError) {
        cb(newUserError);
      } else {
        cb(null, newUser);
      }
    });
  });
}));

passport.serializeUser((user, cb) => cb(null, user._id)); // eslint-disable-line

passport.deserializeUser((id, cb) => {
  User.findOne(id, (err, user) => {
    if (err) {
      cb(err);
    } else {
      cb(null, user);
    }
  });
});

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

app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());

app.use(express.static(path.join(__dirname, './public')));

app.use('/', routes);
app.use('/courses', courses);
app.use('/users', users);

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

app.use((err, req, res) => {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: (app.get('env') === 'development') ? err : {},
  });
});

module.exports = app;