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 bodyParser = require('body-parser');
const cors = require('cors');
const compression = require('compression');

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 bookingController = require('./controllers/bookingController');

const app = express();

app.enable('trust proxy');

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

/////////////////////////////////
// 1) GLOBAL MIDDLEWARES
// Implement CORS
app.use(cors());
app.options('*', cors());

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

// Helmet helps secure Express apps by setting HTTP response headers.
app.use(
  helmet({
    contentSecurityPolicy: false,
    crossOriginEmbedderPolicy: false,
  })
);

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

// Apply the rate limiting middleware to API calls only
const apiLimiter = rateLimit({
  windowMs: 60 * 60 * 1000, // 1 hour
  max: 100, // Limit each IP to 100 requests per `window` (here, per 1 hour)
  message: 'Too many requests from this IP, please try again after an hour!',
});
app.use('/api', apiLimiter);

// (Stripe Webhook) Match the raw body to content type application/json
app.post(
  '/webhook-checkout',
  bodyParser.raw({ type: 'application/json' }),
  bookingController.webhookCheckout
);

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

// Data sanitization against MongoDB Injection (NoSQL Injection)
app.use(mongoSanitize());

// Data sanitization against Cross-site scripting(XSS)
app.use(xss());

// Protect against HTTP Parameter Pollution attacks
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();
// });

/////////////////////////////////
// 2) 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);

// Handling unhandled routes - routes which we haven't defined yet e.g. /api/tours
app.all('*', (req, res, next) => {
  next(new AppError(`Can't find ${req.originalUrl} on this server!`, 404));
});

// Global Error Handling Middleware
app.use(globalErrorHandler);

module.exports = app;