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');

// Start express app
// Releasing methods from express and storing into app
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());
// Access-Control-Allow-Origin *
// app.use(cors({
//   origin: 'https://www.natours.com'
// }))

app.options('*', cors());

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

// Set security HTTP headers
app.use(helmet({
  contentSecurityPolicy: {
    directives: {
      defaultSrc: ["'self'", 'data:', 'blob:', 'https:', 'ws:'],
      baseUri: ["'self'"],
      fontSrc: ["'self'", 'https:', 'data:'],
      scriptSrc: [
        "'self'",
        'https:',
        'http:',
        'blob:',
        'https://*.mapbox.com',
        'https://js.stripe.com',
        'https://m.stripe.network',
        'https://*.cloudflare.com',
      ],
      frameSrc: ["'self'", 'https://js.stripe.com'],
      objectSrc: ["'none'"],
      styleSrc: ["'self'", 'https:', "'unsafe-inline'"],
      workerSrc: [
        "'self'",
        'data:',
        'blob:',
        'https://*.tiles.mapbox.com',
        'https://api.mapbox.com',
        'https://events.mapbox.com',
        'https://m.stripe.network',
      ],
      childSrc: ["'self'", 'blob:'],
      imgSrc: ["'self'", 'data:', 'blob:'],
      formAction: ["'self'"],
      connectSrc: [
        "'self'",
        "'unsafe-inline'",
        'data:',
        'blob:',
        'https://*.stripe.com',
        'https://*.mapbox.com',
        'https://*.cloudflare.com/',
        'https://bundle.js:*',
        'ws://127.0.0.1:*/',
      ],
      upgradeInsecureRequests: [],
    },
  },
}));

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

// Limit requests from same API
const limiter = rateLimit({
  max: 20,
  windowMs: 60 * 60 * 1000,
  message: 'Too many requests from this IP, please try again in an hour!',
});
app.use('/api', limiter); // applied only to api route

// With webhook turn on this 

// Stripe webhook, BEFORE body-parser, because stripe needs the body as stream --==
app.post(
  '/webhook-checkout',
  express.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 NoSQL query injection
app.use(mongoSanitize());

// Data sanitization against XSS
app.use(xss());
// {"email": { "$gt": "" }}

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

// Compression ( Working for text only)
app.use(compression());

// Custom middleware stack needed before the route handler

// Test middleware
// never forget to use next in all your middlewares
app.use((req, res, next) => {
  req.requestTime = new Date().toISOString();
  // console.log(req.cookies);
  next(); // response cycle will be stuck if we don't call next here for the middleware
});

// 3. ROUTES // Route mounting into API 
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);

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

app.use(globalErrorHandler);

module.exports = app;
/////