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

const app = express();

app.set('view engine', 'pug');
app.set('views', path.join(__dirname, 'views'));

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

// ! MIDDLEWARES

// Security HTTP Headers
app.use(
  helmet.contentSecurityPolicy({
    directives: {
      defaultSrc: ["'self'", 'data:', 'blob:'],
      fontSrc: ["'self'", 'https:', 'data:'],
      scriptSrc: ["'self'", 'https://*.cloudflare.com'],
      scriptSrcElem: ["'self'", 'https:', 'https://*.cloudflare.com'],
      styleSrc: ["'self'", 'https:', 'unsafe-inline'],
      connectSrc: ["'self'", 'data', 'https://*.cloudflare.com'],
    },
  })
);

// Development Morgan
if (process.env.NODE_ENV === 'development') app.use(morgan('dev'));

// Limit the api calls from same ip
const limiter = rateLimit({
  max: 100,
  windowMs: 60 * 60 * 1000,
  message:
    'Too many requests from this IP Address, please try again in an hour!',
});
app.use('/api', limiter);

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

// Data Sanitization again NoSQL query injection
app.use(mongoSanitize());

// Data Sanitization agains XSS
app.use(xss());

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

// Testing Middleware
app.use((req, res, next) => {
  req.requestTime = new Date().toISOString();
  next();
});

// ! 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;