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index.js
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index.js
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import process from 'node:process'
import parser from 'npm:ua-parser-js'
import { uniqueNamesGenerator, animals, colors } from 'npm:unique-names-generator'
const serverRegion = Deno.env.get("DENO_REGION") || 'local';
const bus = new BroadcastChannel('bus');
bus.onmessage = (event) => {
const { type, message } = event.data;
switch (type) {
case 'peer-online': {
bus.dispatchEvent(new CustomEvent('peer-online', { detail: message }));
break;
}
case 'peer-offline': {
bus.dispatchEvent(new CustomEvent('peer-offline', { detail: message }));
break;
}
}
};
function onProcess() {
process.on('SIGINT', () => {
console.info("SIGINT Received, exiting...")
process.exit(0)
})
process.on('SIGTERM', () => {
console.info("SIGTERM Received, exiting...")
process.exit(0)
})
process.on('uncaughtException', (error, origin) => {
console.log('----- Uncaught exception -----')
console.log(error)
console.log('----- Exception origin -----')
console.log(origin)
})
process.on('unhandledRejection', (reason, promise) => {
console.log('----- Unhandled Rejection at -----')
console.log(promise)
console.log('----- Reason -----')
console.log(reason)
})
}
function hashCode(str) {
let hash = 0, i, chr;
for (i = 0; i < str.length; i++) {
chr = str.charCodeAt(i);
hash = ((hash << 5) - hash) + chr;
hash |= 0; // Convert to 32bit integer
}
return hash;
}
function isLocalNetwork(ip) {
const parts = ip.split('.').map(part => parseInt(part, 10));
if (parts[0] === 10) { // 10.0.0.0 - 10.255.255.255
return true;
} else if (parts[0] === 172 && parts[1] >= 16 && parts[1] <= 31) { // 172.16.0.0 - 172.31.255.255
return true;
} else if (parts[0] === 192 && parts[1] === 168) { // 192.168.0.0 - 192.168.255.255
return true;
}
return false;
}
class Peer {
constructor(socket, request, info) {
// set socket
this.socket = socket;
// set remote ip
this._setIP(request, info);
// set peer id
this._setPeerId(socket);
// set room id
this._setRoomID();
// is WebRTC supported ?
this.rtcSupported = request.url.indexOf('webrtc') > -1;
// set name
this._setName(request);
// for keepalive
this.timerId = 0;
this.lastBeat = Date.now();
}
_setIP(request, info) {
if (request.headers['x-forwarded-for']) {
this.ip = request.headers['x-forwarded-for'].split(/\s*,\s*/)[0];
} else {
this.ip = info.remoteAddr.hostname;
}
// IPv4 and IPv6 use different values to refer to localhost
if (this.ip == '::1' || this.ip == '::ffff:127.0.0.1') {
this.ip = '127.0.0.1';
}
// Check if the IP is from a local network
if (isLocalNetwork(this.ip)) {
this.ip = '127.0.0.1';
}
}
_setPeerId(socket) {
this.id = socket.peerId;
}
_setRoomID() {
this.rid = this.ip;
}
toString() {
return `<Peer id=${this.id} ip=${this.ip} rtcSupported=${this.rtcSupported}>`
}
_setName(req) {
const ua = parser(req.headers['user-agent']);
let deviceName = '';
if (ua.os && ua.os.name) {
deviceName = ua.os.name.replace('Mac OS', 'Mac') + ' ';
}
if (ua.device.model) {
deviceName += ua.device.model;
} else {
deviceName += ua.browser.name;
}
if (!deviceName)
deviceName = 'Unknown Device';
const displayName = uniqueNamesGenerator({
length: 2,
separator: ' ',
dictionaries: [colors, animals],
style: 'capital',
seed: hashCode(this.id)
})
this.name = {
model: ua.device.model,
os: ua.os.name,
browser: ua.browser.name,
type: ua.device.type,
deviceName,
displayName
};
}
getInfo() {
return {
id: this.id,
name: this.name,
rtcSupported: this.rtcSupported
}
}
static uuid() {
let uuid = '',
ii;
for (ii = 0; ii < 32; ii += 1) {
switch (ii) {
case 8:
case 20:
uuid += '-';
uuid += (Math.random() * 16 | 0).toString(16);
break;
case 12:
uuid += '-';
uuid += '4';
break;
case 16:
uuid += '-';
uuid += (Math.random() * 4 | 8).toString(16);
break;
default:
uuid += (Math.random() * 16 | 0).toString(16);
}
}
return uuid;
};
}
class Server {
constructor() {
onProcess();
this._rooms = {};
Deno.serve((request, info) => {
const url = new URL(request.url);
const path = url.pathname;
if (path.includes('images')) {
const headers = new Headers();
headers.set("content-type", "image/png");
const body = Deno.readFileSync('./public' + path);
const response = new Response(body, { status: 200, headers });
return response;
} else if (path.includes('sounds')) {
const headers = new Headers();
headers.set("content-type", "audio/mpeg");
const body = Deno.readFileSync('./public' + path);
const response = new Response(body, { status: 200, headers });
return response;
} else {
switch (path) {
case '/': {
const headers = new Headers();
headers.set("content-type", "text/html");
const body = Deno.readTextFileSync('./public/index.html');
const response = new Response(body, { status: 200, headers });
return response;
}
case '/main.js': {
const headers = new Headers();
headers.set("content-type", "text/javascript");
const body = Deno.readTextFileSync('./public/main.js');
const response = new Response(body, { status: 200, headers });
return response;
}
case '/manifest.json': {
const headers = new Headers();
headers.set("content-type", "application/json");
const body = Deno.readTextFileSync('./public/manifest.json');
const response = new Response(body, { status: 200, headers });
return response;
}
case '/styles.css': {
const headers = new Headers();
headers.set("content-type", "text/css");
const body = Deno.readTextFileSync('./public/styles.css');
const response = new Response(body, { status: 200, headers });
return response;
}
case '/service-worker.js': {
const headers = new Headers();
headers.set("content-type", "text/javascript");
const body = Deno.readTextFileSync('./public/service-worker.js');
const response = new Response(body, { status: 200, headers });
return response;
}
default: {
if (path.includes('server')) {
const requestClone = request.clone();
const { socket, response } = Deno.upgradeWebSocket(request);
socket.peerId = Peer.uuid();
socket.onopen = () => this._onConnection(new Peer(socket, requestClone, info));
console.log(`WebSocket connection established: ${socket.peerId}`);
return response;
} else {
const headers = new Headers();
headers.set("content-type", "text/html");
const body = "404 Not Found";
const response = new Response(body, { status: 200, headers });
return response;
}
}
}
}
})
}
_onConnection(peer) {
this._joinRoom(peer);
peer.socket.onmessage = (event) => this._onMessage(peer, event.data);
this._keepAlive(peer);
// send displayName
this._send(peer, {
type: 'display-name',
message: {
displayName: peer.name.displayName,
deviceName: peer.name.deviceName,
roomID: peer.rid,
serverRegion: serverRegion
}
});
bus.addEventListener('peer-online', (event) => {
for (const roomId in this._rooms) {
for (const peerId in this._rooms[roomId]) {
const otherPeer = this._rooms[roomId][peerId];
this._send(otherPeer, {
type: 'peer-online',
message: event.detail
});
}
}
});
bus.addEventListener('peer-offline', (event) => {
for (const roomId in this._rooms) {
for (const peerId in this._rooms[roomId]) {
const otherPeer = this._rooms[roomId][peerId];
this._send(otherPeer, {
type: 'peer-offline',
message: event.detail
});
}
}
});
bus.postMessage({
type: 'peer-online',
message: {
displayName: peer.name.displayName,
serverRegion: serverRegion
}
});
}
_onMessage(sender, message) {
// Try to parse message
try {
message = JSON.parse(message);
} catch (_event) {
console.error('Invalid JSON', message);
return;
}
switch (message.type) {
case 'disconnect':
this._leaveRoom(sender);
bus.postMessage({
type: 'peer-offline',
message: {
displayName: sender.name.displayName,
serverRegion: serverRegion
}
});
break;
case 'pong':
sender.lastBeat = Date.now();
break;
case 'updateRID':
this._changeRoom(sender, message.rid);
break;
}
// relay message to recipient
if (message.to && this._rooms[sender.rid]) {
const recipientId = message.to; // TODO: sanitize
const recipient = this._rooms[sender.rid][recipientId];
delete message.to;
// add sender id
message.sender = sender.id;
this._send(recipient, message);
return;
}
}
_joinRoom(peer) {
// if room doesn't exist, create it
if (!this._rooms[peer.rid]) {
this._rooms[peer.rid] = {};
}
// notify all other peers
for (const otherPeerId in this._rooms[peer.rid]) {
const otherPeer = this._rooms[peer.rid][otherPeerId];
this._send(otherPeer, {
type: 'peer-joined',
peer: peer.getInfo()
});
}
// notify peer about the other peers
const otherPeers = [];
for (const otherPeerId in this._rooms[peer.rid]) {
otherPeers.push(this._rooms[peer.rid][otherPeerId].getInfo());
}
this._send(peer, {
type: 'peers',
peers: otherPeers
});
// add peer to room
this._rooms[peer.rid][peer.id] = peer;
}
_leaveRoom(peer, isChangeRoom = false) {
if (!this._rooms[peer.rid] || !this._rooms[peer.rid][peer.id]) return;
if (!isChangeRoom) {
this._cancelKeepAlive(this._rooms[peer.rid][peer.id]);
peer.socket.close();
}
// delete the peer
delete this._rooms[peer.rid][peer.id];
//if room is empty, delete the room
if (!Object.keys(this._rooms[peer.rid]).length) {
delete this._rooms[peer.rid];
} else {
// notify all other peers
for (const otherPeerId in this._rooms[peer.rid]) {
const otherPeer = this._rooms[peer.rid][otherPeerId];
this._send(otherPeer, { type: 'peer-left', peerId: peer.id });
}
}
}
_changeRoom(peer, rid) {
this._leaveRoom(peer, true);
peer.rid = rid;
this._joinRoom(peer);
}
_send(peer, message) {
if (!peer) return;
if (peer.socket.readyState !== peer.socket.OPEN) return;
message = JSON.stringify(message);
peer.socket.send(message, _error => '');
}
_keepAlive(peer) {
this._cancelKeepAlive(peer);
const timeout = 30000;
if (!peer.lastBeat) {
peer.lastBeat = Date.now();
}
if (Date.now() - peer.lastBeat > 2 * timeout) {
this._leaveRoom(peer);
return;
}
this._send(peer, { type: 'ping' });
peer.timerId = setTimeout(() => this._keepAlive(peer), timeout);
}
_cancelKeepAlive(peer) {
if (peer && peer.timerId) {
clearTimeout(peer.timerId);
}
}
}
new Server();