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 cors = require('cors');

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 app = express();

app.enable('trust proxy');

app.set('view engine', 'pug');
app.set('views', path.join(__dirname, 'views'));
//  serving static files

// global middlewares
app.use(cors());
app.options('*', cors());

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

const scriptSrcUrls = ['https://unpkg.com/', 'https://tile.openstreetmap.org'];
const styleSrcUrls = [
  'https://unpkg.com/',
  'https://tile.openstreetmap.org',
  'https://fonts.googleapis.com/'
];
const connectSrcUrls = [
  'https://unpkg.com',
  'https://tile.openstreetmap.org',
  'https://bundle.js:*',
  'ws://localhost:*/'
];
const fontSrcUrls = ['fonts.googleapis.com', 'fonts.gstatic.com'];

app.use(
  helmet.contentSecurityPolicy({
    directives: {
      defaultSrc: ["'self'", 'data:', 'blob:', 'https:', 'ws:'],
      baseUri: ["'self'"],
      fontSrc: ["'self'", ...fontSrcUrls],
      scriptSrc: ["'self'", 'https:', 'http:', 'blob:', ...scriptSrcUrls],
      frameSrc: ["'self'", 'https://js.stripe.com'],
      objectSrc: ["'none'"],
      styleSrc: ["'self'", "'unsafe-inline'", ...styleSrcUrls],
      workerSrc: ["'self'", 'blob:', 'https://m.stripe.network'],
      childSrc: ["'self'", 'blob:'],
      imgSrc: ["'self'", 'blob:', 'data:', 'https:'],
      formAction: ["'self'"],
      connectSrc: ["'self'", 'data:', 'blob:', ...connectSrcUrls]
      // upgradeInsecureRequests: [],
    }
  })
);

if (process.env.NODE_ENV === 'development') {
  app.use(morgan('dev'));
}
const limiter = rateLimit({
  max: 100,
  windowMs: 60 * 60 * 1000,
  message: 'Too many requests please try again later'
});

// limit requests from same api
app.use('/api', limiter);

app.post(
  '/webhook-checkout',
  express.raw({
    type: 'application/json'
  }),
  bookingController.webhookCheckout
);

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

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

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

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

app.use(compression());

// test middleware
app.use((req, res, next) => {
  req.requestTime = new Date().toISOString();
  // console.log(req.cookies);
  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;