app.js

/* eslint-disable no-console */
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'); //http parameter pollution---> full form
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 viewRouter = require('./routes/viewRoutes');

const app = express();

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

// 1) GLOBAL MIDDLEWARES
//serving static files
app.use(express.static(path.join(__dirname, 'public')));
//Access-Control-Allow-Origin *
app.use(cors());
//for one perticular origin
//app.use(cors({origin:'https://www.natours.com}))

//for non simple requests(delete, patch..)
//option is a http method
app.options('*', cors());

//Set security HTTP headers
// app.use(helmet());
app.use(
  helmet.contentSecurityPolicy({
    directives: {
      defaultSrc: ["'self'", 'data:', 'blob:'],

      fontSrc: ["'self'", 'https:', 'data:'],

      scriptSrc: ["'self'", 'https://*.cloudflare.com'],

      scriptSrcElem: ["'self'", 'https:', 'https://*.cloudflare.com'],

      styleSrc: ["'self'", 'https:', 'unsafe-inline'],

      connectSrc: [
        "'self'",
        'data',
        'https://*.cloudflare.com ws://localhost:53880/'
      ]
    }
  })
);

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

//limit request 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 the body into req.body [the '10kb' is 10 kiloByte, basically limiting the amount of body data so if user adds anything forcefully to body it is not accepted]
app.use(express.json({ limit: '10kb' }));
app.use(express.urlencoded({ extended: true, limit: '10kb' }));
app.use(cookieParser());

//Data sanitization against NoSQL query injection---> try postman login but in place of email put-> {"gt":""}
//this will filter out all of the $,. symbols
app.use(mongoSanitize());

//Data sanitization against XSS
//xss-clean helps remove some js_html code if ever inserted
app.use(xss());

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

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(`Cant find ${req.originalUrl} on this server!`, 404));
});

app.use(globalErrorHandler);

module.exports = app;