index.js

'use strict';

const { join } = require('path');

const express = require('express');
const bodyParser = require('body-parser');

const abs = path => join(__dirname, path);

require('./generateMarkup');

const { validate, parse } = require('./url');
const { find, add } = require('./db');

const app = express();

app.use(bodyParser.text({ type: '*/*' }));

app.use(express.static(abs('web')));

app.get('/:id', (req, res) =>
	find(req.params.id).then(url => url
		? res.redirect(url)
		: res.sendStatus(404)));

app.post('/', (req, res) => (url =>
	validate(url)
		? add(parse(url)).then(id => id
			? (res.set('Access-Control-Allow-Origin', '*'),
				res.send(id))
			: res.status(500).send('Server Error'))
		: res.status(400).send('Invalid URL'))(String(req.body)));

app.listen(4000, '127.0.0.1', (err) => err
	? console.error(err)
	: console.log('Server listening on port 4000'));