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 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 viewRouter = require('./routes/viewRoutes');

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

const app = express();
//for heroku
app.enable('trust proxy');

//SETUP TEMPLATE ENGINE
app.set('view engine', 'pug');
app.set('views', path.join(__dirname, '/views'));

// 1) GLOBAL MIDDLEWARE

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

// Set security HTTP headers
app.use(helmet());

// Development logging
if (process.env.NODE_ENV === 'development') {
  app.use(morgan('dev'));
}
// Limit requests from same API
const limiter = rateLimit({
  max: 100,
  windowMs: 60 * 60 * 1000, //1 HOURS
  message: 'Too many requests from this IP, please try again in an hour!'
});
app.use('/api', limiter);

// 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());

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

//for file compression
app.use(compression());

// Test middleware
app.use((req, res, next) => {
  req.requestTime = new Date().toISOString();

  //console.log(req.cookies);
  //console.log(req.headers);
  res.header('Content-Security-Policy', 'X-Content-Security-Policy');
  //PREVENT CORS ERROR
  res.header('Access-Control-Allow-Origin', 'http://localhost:3000');
  res.header('Access-Control-Allow-Credentials', true);
  res.header(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept, Authorization'
  );
  if (req.method === 'OPTIONS') {
    res.header('Access-Control-Allow-Methods', 'PUT, POST, PATCH, DELETE, GET');
    return res.status(200).json({});
  }
  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/booking', bookingRouter);

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

//central error counter
app.use(globalErrorHandler);

module.exports = app;