app.js

const express = require('express');
const path = require('path');
const morgan = require('morgan');
const helmet = require('helmet');
const rateLimit = require('express-rate-limit');
const mongoSanitize = require('express-mongo-sanitize');
const xss = require('xss-clean');
const chalk = require('chalk');

const AppError = require('./utils/appError');
const globalErrorController = require('./controllers/errorController');

const app = express();
const userRouter = require('./routes/userRoutes');
const patientRouter = require('./routes/patientRoutes');
const doctorRouter = require('./routes/doctorRoutes');
const bookingRouter = require('./routes/bookingRoutes');

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

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

// Data sanitization against XSS
app.use(xss());

// Security HTTP headers
app.use(helmet());

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

// Setting a rate-limit for requests from the same IP
const limiter = rateLimit({
  max: 250,
  windowMs: 60 * 60 * 1000,
  message: 'Too many requests from this IP, please try again in an hour!',
});
app.use('/api', limiter);

app.use(express.json({ limit: '100kb' }));

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

app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'rootPage.html'));
});

app.use('/api/v1/users', userRouter);
app.use('/api/v1/patients', patientRouter);
app.use('/api/v1/doctors', doctorRouter);
app.use('/api/v1/bookings', bookingRouter);

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

// Global Error Middleware
app.use(globalErrorController);

module.exports = app;