server.js

'use strict';

global.express = require('express');
global.expressValidator = require('express-validator');
global.helmet = require('helmet'); // security package
global.BASE_PATH = __dirname;
// configuration file
global.config = require('./configuration/config');
global.Constants = require('./utils/Constants');
global.helpers = require('./utils/Helper');
global.messages = require('./utils/messages');
global.underscoreObj = require('underscore');

const app = express(); // create an instance of an express

const SwaggerApiDoc = require('./utils/SwaggerApiDoc');
new SwaggerApiDoc(app);


console.info(`Application is runnign at port :${config.get('server.port')}`);

console.info(`Swagger Doc is running at :${config.get('server.host')}:${config.get('server.port')}/api-docs/#/`);

app.use(express.json({ limit: '1000mb' }));
// app.use(express.urlencoded({ limit: '1000mb' }))

app.use(helmet());

app.disable('x-powered-by');
app.disable('etag'); // this will disable etag to restrict 304 status

app.use('/api/v1/', require('./routes/index'));

// catch 404 and forward to error handler
app.use((req, res, next) => {
  var err = new Error('Bad Request');
  err.status = Constants.httpStatusCode().NOT_FOUND;
  next(err);
});

function exitHandler () {
  console.error(__filename, '', 'Exit handler');
  process.exit(1);
}

// Node JS event signal for exception handling
[ 'exit', 'SIGINT', 'SIGUSR1', 'SIGUSR2', 'uncaughtException',
  'SIGTERM' ].forEach((eventType) => {
  process.on(eventType, exitHandler.bind());
});


// any missed exception handle will handle here
app.use((err, req, res, next) => {
  console.error(__filename, '', 'last error handled', err.stack);
  console.debug(__filename, 'server error handle', req.method, req.url);
  var statusCode = err.status || Constants.httpStatusCode().SERVER_ERROR;

  helpers.createResponse(res, statusCode,
    messages.INTERNAL_SERVER_ERROR,
    {
      error: messages.INTERNAL_SERVER_ERROR
    }
  );
});

module.exports = app;