app.js

const express = require('express');
const cors = require('cors');
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 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 app = express();

// Middleware
// Enable CORS
app.use(cors());

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

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

// Limit request from same IP
const limiter = rateLimit({
  max: 100,
  windowMS: 60 * 60 * 1000,
  message: 'Too many request from this IP, try again in an hour!',
});
app.use('/api', limiter);

// Static file
app.use(express.static('public'));

// Body parser, reading data from body into req.body
app.use(express.json({ limit: '10kb' }));
app.use(express.urlencoded({ extended: false }));

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

// Data sanitization against xss(user input from malicious html)
app.use(xss());

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

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

  next();
});
app.use((req, res, next) => {
  req.requestedTime = new Date().toISOString();
  next();
});

// Routes
app.get('/', (req, res) =>
  res.status(200).sendFile(`${__dirname}/public/frontpage.html`)
);
app.get('/api/v1', (req, res) =>
  res.status(200).json({
    status: 'success',
    message: 'Welcome to Natours API'
})
);
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;