app.js

const path = require('path');
const express = require('express');
const morgan = require('morgan');
const rateLimit = require('express-rate-limit');
// const helmet = require('helmet');
const mongoSanitize = require('express-mongo-sanitize');
const xss = require('xss-clean');
const hpp = require('hpp');
const cookieParser = require('cookie-parser');
const compression = require('compression');

const tourRouter = require('./src/routes/tourRoutes');
const userRouter = require('./src/routes/userRoutes');
const reviewRouter = require('./src/routes/reviewRoutes');
const bookingRouter = require('./src/routes/bookingRoutes');
const AppError = require('./src/Utils/appError');
const globalErrorHandler = require('./src/controllers/errorController');
const viewRouter = require('./src/routes/viewRoutes');

const app = express();

// SETTING VIEW ENGINE
app.set('view engine', 'pug');
app.set('views', path.join(__dirname, 'src', 'views'));

// GLOBAL MIDDLEWARES

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

// set security http headers
// app.use(helmet());

// show request details in log if in development mode
if (process.env.NODE_ENV === 'development') {
  app.use(morgan('dev'));
}

// limiting requests
const limiter = rateLimit({
  max: 100,
  windowMs: 60 * 60 * 1000,
  message: 'Too many requests, please try again in an hour!',
});

app.use('/api', limiter);

// body parser
app.use(express.json({ limit: '10kb' }));
app.use(express.urlencoded({ extended: true, limit: '10kb' }));
app.use(cookieParser());

// data sanitization against NoSQL query injection
app.use(mongoSanitize());

// data sanitization against XSS
app.use(xss());

// prevent parameter polution
app.use(
  hpp({
    whitelist: [
      'duration',
      'ratingsQuantity',
      'ratingsAverage',
      'maxGroupSize',
      'difficulty',
      'price',
    ],
  })
);

app.use(compression());

// ROUTES

app.use('/', viewRouter);
app.use('/api/v1/tours', tourRouter);
app.use('/api/v1/users', userRouter);
app.use('/api/v1/reviews', reviewRouter);
app.use('/api/v1/bookings', bookingRouter);

app.all('*', (req, res, next) => {
  next(new AppError(`Can't find ${req.originalUrl} on this server!`, 404));
});

app.use(globalErrorHandler);

module.exports = app;