app.js

'use strict';

const express = require('express');
const app = express();
const mongoose = require('mongoose');
const os = require('os');
const config = require('./config/config');
const compression = require('compression');
const helmet = require('helmet');
const cors = require("cors");
const swaggerUi = require('swagger-ui-express');
const YAML = require('yamljs');

mongoose.Promise = global.Promise;
// set the global useNewUrlParser option to turn on useNewUrlParser for every connection by default.
mongoose.set('useNewUrlParser', true);
// indexes for Mongoose schemas
mongoose.set('useCreateIndex', true);
// mongoose debug mode, by default false
mongoose.set('debug', false);
// connecting to db
mongoose.connect(config.MONGO_URI, { useNewUrlParser: true, useUnifiedTopology: true });
// handle connected event
mongoose.connection.on('connected', () => {
  console.info('Mongoose connected to : ' + config.MONGO_URI);
});
// handle error event
mongoose.connection.on('error', (err) => {
  console.error(err);
  process.exit(0);
});

// handle disconnected event
mongoose.connection.on('disconnected', () => {
  console.log('Mongoose disconnected.');
});

// handle application termination event
process.on('SIGINT', () => {
  mongoose.connection.close(() => {
    console.info('MongoDB disconnected through application termination.');
    process.exit(0);
  });
});

app.set('case sensitive routing', true);
app.set('env', config.NODE_ENV);
app.set('port', config.PORT);

const swaggerDocument = YAML.load('./definitions/swagger.yaml');
if (app.get('env') === 'production') {
  swaggerDocument.host = config.SWAGGER_URL;
}
else {
  swaggerDocument.host = `${os.hostname()}:${config.PORT}`;
}

let swagOptions = {
  explorer: false,
  customCss: '.swagger-ui .topbar { display: none }'
};
app.use('/docs', swaggerUi.serve, swaggerUi.setup(swaggerDocument, swagOptions));

app.use(cors());
app.use(helmet());
app.use(compression());
app.use(express.urlencoded({ extended: false, limit: '50mb' }));
app.use(express.json({ limit: '1mb' }));

app.use((req, res, next) => {
  console.log(req.method, req.url);
  console.log(req.headers);
  console.log(req.body || req.query);
  next();
})

// importing all modules
app.use('/api',
  require('./modules/user/router')
);

app.use((req, res) => {
  return res.status(404).send({ success: false, msg: 'API not found', data: req.originalUrl + ' not found' })
});

// this route is only for upload file testing using html code use uploadImage api to upload file
app.get('/upload', (req, res) => {
  res.sendFile(__dirname + '/partials/index.html');
});

app.use((err, req, res, next) => {
  return res.status(500).send({
    success: false, msg: 'Internal Server Error',
    data: (app.get('env') === 'production') ? {} : err.stack
  });
});

module.exports = app;