server.js

const express = require('express')
const dotenv = require('dotenv')
const morgan = require('morgan')
const connectDB = require('./config/db')
const colors = require('colors')
const errorHandler = require('./middleware/error')
const path = require('path')
const fileupload = require('express-fileupload');
const cookieParser = require('cookie-parser');
const mongoSantize = require('express-mongo-sanitize')
const helmet = require('helmet')
const xss = require('xss-clean')
const rateLimit = require('express-rate-limit')
const hpp = require('hpp')
const cors = require('cors')


// Load env vars
dotenv.config({ path: './config/config.env'});

//Connect to database
connectDB();

const app = express();

// Body parser
app.use(express.json());

// File uploading
app.use(fileupload());

// Sanitize data
app.use(mongoSantize())

// Set security headers
app.use(helmet())

// Prevent XSS attack
app.use(xss())

// Rate limiting
const limiter = rateLimit({
    windowMs: 10*60*1000, // 10 mins
    max: 100
})
app.use(limiter)

// Prevent http param pollution
app.use(hpp())

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

//Set static folder
app.use(express.static(path.join(__dirname, 'public')))
//Cookie Parser
app.use(cookieParser());

// Route files
const bootcamps = require('./routes/bootcamps');
const courses = require('./routes/courses');
const auth = require('./routes/auth');
const users = require('./routes/users');
const reviews = require('./routes/reviews');


// Dev logging middleware
if(process.env.NODE_ENV ==='development') {
    app.use(morgan('dev'));
}
// Mount routers
app.use('/api/v1/bootcamps', bootcamps);
app.use('/api/v1/courses', courses);
app.use('/api/v1/auth', auth);
app.use('/api/v1/users', users);
app.use('/api/v1/reviews', reviews);

app.use(errorHandler)

const PORT = process.env.PORT || 5000;

const server = app.listen(
    PORT, 
    console.log(
        `Server running in ${process.env.NODE_ENV} mode on port ${PORT}`.yellow.bold
        ));

// Handle unhandled promise rejections
process.on('unhandledRejection', (err, promise) => {
    console.log(`Error: ${err.message}`.red)
    // Close server & exit process
    server.close(() => process.exit(1))
})