app.js

const path = require('path');
const express = require('express');
const morgan = require('morgan');
const rateLimit = require('express-rate-limit');

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 bookingRouter = require('./routes/bookingRoutes');
const bookingController = require('./controllers/bookingController');

const viewRouter = require('./routes/viewRoutes');
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 app = express();

// Set security HTTP headers
app.use(helmet());
// app.use(helmet.crossOriginResourcePolicy({ policy: 'cross-origin' }));

// Use pug templates to render front end
app.set('view engine', 'pug');
app.set('views', path.join(__dirname, 'views'));

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

// Global Middlewares
if (process.env.NODE_ENV === 'development') {
  app.use(morgan('dev')); // Shows GET, POST, status codes etc. on server console
}

const limiter = rateLimit({
  max: 100,
  windowMs: 60 * 60 * 1000,
  message: 'Too many requests from this IP, please try again in 1 hour.',
});

// Limit access to the API route
app.use('/api', limiter);

// Body coming from stripe is not JSON
app.post(
  '/webhook-checkout',
  express.raw({ type: 'application/json' }),
  bookingController.webhookCheckout
);

// Body parser, reading data from the body into req.body
app.use(express.json({ limit: '10kb' })); // Middleware, allows post routes

// Middleware to allow to parse data coming from a form (in user account route /me)
app.use(express.urlencoded({ extended: true, limit: '10kb' })); // Allows to pass more complex data, max 10k
app.use(cookieParser());

// Data sanitization against NoSQL query injection, XSS
app.use(mongoSanitize());
app.use(xss());

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

app.use(compression());

// ------------------------------------------------------------------

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

// ------------------------------------------------------------------
// Route mounting
// app.get('/', (req, res) => {
//   res.status(200).render('base');
// });

// app.get('/overview', (req, res) => {
//   res.status(200).render('overview', {
//     title: 'All Tours',
//   });
// });

// app.get('/tour', (req, res) => {
//   res.status(200).render('overview', {
//     title: 'TBD',
//   });
// });
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);

// Catch unhandled routes
app.all('*', (req, res, next) => {
  // Anything passed into next assumes error
  next(
    new AppError(`Unable to locate ${req.originalUrl} on this server!`, 404)
  );
});

// Middleware error handling
app.use(globalErrorHandler);

// Server code done separately
module.exports = app;