ASR_tangibles/emitter/backend/server.js

const express = require('express');
const { Bundle, Client } = require('node-osc');
const path = require('path');

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

const oscClient = new Client('127.0.0.1', 3333);
let alive = [];
let fseq;

const server = require('http').Server(app);

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended:true}));
app.use(express.static('./frontend/assets'));

app.get('/', function (req, res) {
	res.sendFile('./frontend/index.html', { root: path.resolve(__dirname + '/..') })
});

app.post('/json', function (req, res) {
	if (req.body.debug) {
		console.log(req.body);
	}
	let oscBundle;
	if (req.body.event === 'touchend') {
		fseq = fseq ? fseq + 1 : 1;

		const aliveMessage = [ '/tuio/2Dcur', 'alive' ].concat(alive);
		oscBundle = new Bundle(
			[ '/tuio/2Dcur', 'source', `tangibles${req.body.section.toString()}@127.0.0.1` ],
			aliveMessage,
			[ '/tuio/2Dcur', 'fseq', fseq ],
			[
				'/tuio/2Dcur',
				'del',
				req.body.changedTouches[0].identifier
			]
		);
		oscClient.send(oscBundle, () => {
			const index = alive.indexOf(req.body.changedTouches[0].identifier);
			alive.splice(index, 1);
			if (alive.length === 0) {
				oscBundle = new Bundle(
					[ '/tuio/2Dcur', 'source', `tangibles${req.body.section.toString()}@127.0.0.1` ],
					[ '/tuio/2Dcur', 'alive' ],
					[ '/tuio/2Dcur', 'fseq', fseq ]
				);
				oscClient.send(oscBundle, () => {
					res.status(200).json(JSON.stringify(req.body));
					fseq = 0;
				});
			} else {
				res.status(200).send();
			}
		});
	} else {
		if (req.body.changedTouches && req.body.changedTouches.length && req.body.changedTouches.length > 0) {
			fseq = fseq ? fseq + 1 : 1;
			const touches = Object.keys(req.body.changedTouches);
			const aliveMessage = [ '/tuio/2Dcur', 'alive' ].concat(alive);
			touches.forEach(touch => {
				const id = req.body.changedTouches[touch].identifier;
				if (!alive.includes(id)) {
					alive.push(id);
					aliveMessage.push(id);
				}
			});

			oscBundle = new Bundle(
				[ '/tuio/2Dcur', 'source', `tangibles${req.body.section.toString()}@127.0.0.1` ],
				aliveMessage,
				[ '/tuio/2Dcur', 'fseq', fseq ]
			);
			touches.forEach(touch => {
				oscBundle.append(
					[
						'/tuio/2Dcur',
						'set',
						req.body.changedTouches[touch].identifier,
						req.body.changedTouches[touch].clientX / req.body.screenW,
						req.body.changedTouches[touch].clientY / req.body.screenH,
						0.0,
						0.0
					]
				);
			});
			oscClient.send(oscBundle, () => {
				res.status(200).json(JSON.stringify(req.body));
			});
		} else {
			res.status(400).send();
		}
	}
});

server.listen(5001, function () {
 console.log('Votre app est disponible sur localhost:5001 !')
});