server.js

var express = require('express');
var http = require('http');
var debug = require('debug')('tle:server');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var bodyParser = require('body-parser');
var cors = require('cors');

var config = require('./config.json');

var init = require('./init');

var routes = require('./routes/index');
var user = require('./routes/user');

var problemApi = require('./routes/api/v0.1/problem');
var statisticApi = require('./routes/api/v0.1/statistic');
var submissionApi = require('./routes/api/v0.1/submission');
var userApi = require('./routes/api/v0.1/user');

var app = express();

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

// uncomment after placing your favicon in /public
//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(express.static(path.join(__dirname, 'public')));

app.use(cors({
  origin: config.frontEndUrl || '*'
}));

app.use('/', routes);
app.use('/user', user);

app.use('/api/v0.1/problem', problemApi);
app.use('/api/v0.1/statistic', statisticApi);
app.use('/api/v0.1/submission', submissionApi);
app.use('/api/v0.1/user', userApi);

// 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 handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

function onListening() {
  var addr = server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);
}

function normalizePort(val) {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

var port = normalizePort(config.port || '3000');
app.set('port', port);

var server = http.createServer(app);

init.initializeRedis(function (err) {
  if (err) {
    console.error("error initializing app: " + err);
  } else {
    server.listen(port);
    server.on('error', onError);
    server.on('listening', onListening);
  }
});

module.exports = app;