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 tourRouter = require('./routes/tourRoutes');
const userRouter = require('./routes/userRoutes');
const reviewRouter = require('./routes/reviewRoutes');
const bookingRouter = require('./routes/bookingRoutes');
const AppError = require('./utils/appError');
const globalErrorHandler = require('./controllers/errorController');

const app = express();

// 1) GLOBAL MIDDLEWARES
// to serve static files
app.use(express.static(path.join(__dirname, 'client', 'build')))

// Set Security HTTP Headers
app.use(helmet());

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

// Body parser, adds data to the incoming body
app.use(express.json({ 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', 'average', 'maxGroupSize', 'difficulty', 'price']
}));

// Add current time
app.use((req, res, next) => {
  req.requestTime = new Date().toISOString();
  next();
})

app.use(compression());


// 2) ROUTES
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.get("*", (req, res) => {
  res.sendFile(path.join(__dirname, "client", "build", "index.html"));
});

// 3) Error handler
app.all('*', (req, res, next) => {
  next(new AppError(`Cannot find ${req.originalUrl} on this server!`, 404));
});

// 4) Global Error Handler
app.use(globalErrorHandler)

module.exports = app;