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 cors = require('cors');
const cookieParser = require('cookie-parser');
const csp = require('express-csp');
const compression = require('compression');
// const methodOverride = require('method-override');

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');

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 *
// api.natours.com, front-end natours.com
// app.use(cors({
//   origin: 'https://www.natours.com'
// }))

app.options('*', cors());
// app.options('/api/v1/tours/:id', cors());

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

// Set security HTTP headers
csp.extend(app, {
  policy: {
    directives: {
      'default-src': ['self'],
      'style-src': ['self', 'unsafe-inline', 'https:'],
      'font-src': ['self', 'https://fonts.gstatic.com'],
      'script-src': [
        'self',
        'unsafe-inline',
        'data',
        'blob',
        'https://js.stripe.com',
        'https://*.mapbox.com',
        'https://*.cloudflare.com/',
        'https://bundle.js:8828',
        'ws://localhost:56558/',
      ],
      'worker-src': [
        'self',
        'unsafe-inline',
        'data:',
        'blob:',
        'https://*.stripe.com',
        'https://*.mapbox.com',
        'https://*.cloudflare.com/',
        'https://bundle.js:*',
        'ws://localhost:*/',
      ],
      'frame-src': [
        'self',
        'unsafe-inline',
        'data:',
        'blob:',
        'https://*.stripe.com',
        'https://*.mapbox.com',
        'https://*.cloudflare.com/',
        'https://bundle.js:*',
        'ws://localhost:*/',
      ],
      'img-src': [
        'self',
        'unsafe-inline',
        'data:',
        'blob:',
        'https://*.stripe.com',
        'https://*.mapbox.com',
        'https://*.cloudflare.com/',
        'https://bundle.js:*',
        'ws://localhost:*/',
      ],
      'connect-src': [
        'self',
        'unsafe-inline',
        'data:',
        'blob:',
        // 'wss://<HEROKU-SUBDOMAIN>.herokuapp.com:<PORT>/',
        'https://*.stripe.com',
        'https://*.mapbox.com',
        'https://*.cloudflare.com/',
        'https://bundle.js:*',
        'ws://localhost:*/',
      ],
    },
  },
});

// 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,
  message: 'Too many requests from this IP, please try again in an hour!',
});
app.use('/api', limiter);

// Body parser, reading data from body into req.body
app.use(express.json({ limit: '12kb' }));
app.use(express.urlencoded({ extended: true, limit: '12kb' }));
app.use(cookieParser());

//Setting for method override in Express
// app.use(methodOverride('_method'));

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

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

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

// compress all the texts sent to the client
app.use(compression());

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

  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!`, 404));
});

app.use(globalErrorHandler);

module.exports = app;