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/globalErrorHandler');
const bookingController = require('./controllers/bookingController');
const tourRouter = require('./routes/tourRoutes');
const userRouter = require('./routes/userRoutes');
const reviewRouter = require('./routes/reviewRoute');
const viewRouter = require('./routes/viewRoute');
const bookingRouter = require('./routes/bookingRoutes');
const { application } = require('express');

const app = express();

// Because heroku acts as a proxy
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.options('*', cors());

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

// Set security HTTP headers
app.use(
  helmet.contentSecurityPolicy({
    directives: {
      defaultSrc: ["'self'", 'https:', 'http:', 'data:', 'ws:'],
      baseUri: ["'self'"],
      fontSrc: ["'self'", 'https:', 'http:', 'data:'],
      scriptSrc: ["'self'", 'https:', 'http:', 'blob:'],
      styleSrc: ["'self'", 'https:', 'http:', 'unsafe-inline'],
    },
  })
);

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

// Set limit--> It will allow 100 requests in 1hr from a particular IP
const limiter = rateLimit({
  max: 100,
  windowMs: 60 * 60 * 1000,
  message: 'Too many requests from this IP, please try again in an hour!',
});
app.use('/api', limiter);

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());

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

app.use(compression());

// app.use((req, res, next) => {
//   console.log('Hello from the middleware 👋');
//   next();
// });

// Test Middleware
app.use((req, res, next) => {
  req.requestTime = new Date().toISOString();
  // console.log(req.cookies.jwt);
  // console.log(x); // testing

  next();
});

// 3) 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`));
});

// GLOBAL ERROR HANDLING MIDLEWARE
app.use(globalErrorHandler);

module.exports = app;