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126 lines
3.5 KiB
TypeScript
126 lines
3.5 KiB
TypeScript
// Taken from: https://github.com/jitsi/excalidraw-backend
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import debug from 'debug';
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import dotenv from 'dotenv';
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import express from 'express';
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import http from 'http';
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import {Server} from 'socket.io';
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/*
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import * as prometheus from 'socket.io-prometheus-metrics';
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do not use anymore, since 3 years no further progression, depends on debug 4.1.1,
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wich is moderate vulnerable to regular expression denial of service when untrusted user
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input is passed into the o formatter.
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alternatively could be used prom-client
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import
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*/
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const serverDebug = debug('server');
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dotenv.config(
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process.env.NODE_ENV === 'development'
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? { path: '.env.development' }
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: { path: '.env.production' }
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);
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const app = express();
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const port = process.env.PORT || 80; // default port to listen
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app.get('/', (req, res) => {
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res.send('Excalidraw backend is up :)');
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});
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const server = http.createServer(app);
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server.listen(port, () => {
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serverDebug(`listening on port: ${port}`);
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});
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const io = require("socket.io")(Server, {
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cors: {
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origin: "https://meet.jit.si",
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credentials: true
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},
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maxHttpBufferSize: 10e6,
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pingTimeout: 10000
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});
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// listens on host:9090/metrics
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/* do not use
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prometheus.metrics(io, {
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collectDefaultMetrics: true
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});
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*/
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/* alternatively could be used:
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const client = require('prom-client');
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const collectDefaultMetrics = client.collectDefaultMetrics;
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const Registry = client.Registry;
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const register = new Registry();
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collectDefaultMetrics({ register });
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or more:
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https://codersociety.com/blog/articles/nodejs-application-monitoring-with-prometheus-and-grafana
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*/
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io.on('connection', socket => {
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serverDebug(`connection established! ${socket.conn.request.url}`);
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io.to(`${socket.id}`).emit('init-room');
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socket.on('join-room', roomID => {
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serverDebug(`${socket.id} has joined ${roomID} for url ${socket.conn.request.url}`);
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socket.join(roomID);
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if (io.sockets.adapter.rooms[roomID].length <= 1) {
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io.to(`${socket.id}`).emit('first-in-room');
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} else {
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socket.broadcast.to(roomID).emit('new-user', socket.id);
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}
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io.in(roomID).emit(
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'room-user-change',
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Object.keys(io.sockets.adapter.rooms[roomID].sockets)
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);
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});
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socket.on(
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'server-broadcast',
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(roomID: string, encryptedData: ArrayBuffer, iv: Uint8Array) => {
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socket.broadcast.to(roomID).emit('client-broadcast', encryptedData, iv);
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}
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);
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socket.on(
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'server-volatile-broadcast',
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(roomID: string, encryptedData: ArrayBuffer, iv: Uint8Array) => {
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socket.volatile.broadcast
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.to(roomID)
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.emit('client-broadcast', encryptedData, iv);
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}
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);
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socket.on('disconnecting', () => {
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const rooms = io.sockets.adapter.rooms;
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for (const roomID of Object.keys(socket.rooms)) {
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const clients = Object.keys(rooms[roomID].sockets).filter(id => id !== socket.id);
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if (roomID !== socket.id) {
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socket.to(roomID).emit('user has left', socket.id);
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}
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if (clients.length > 0) {
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socket.broadcast.to(roomID).emit('room-user-change', clients);
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}
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}
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});
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socket.on('disconnect', (reason, details) => {
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serverDebug(
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`${socket.id} was disconnected from url ${socket.conn.request.url} for the following reason: ${reason}
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${JSON.stringify(details)}`
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);
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socket.removeAllListeners();
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});
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});
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