92 lines
2.5 KiB
TypeScript
Executable File
92 lines
2.5 KiB
TypeScript
Executable File
import debug from "debug";
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import express from "express";
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import http from "http";
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import socketIO from "socket.io";
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const serverDebug = debug("server");
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const ioDebug = debug("io");
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const socketDebug = debug("socket");
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const app = express();
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app.use(express.static("public"));
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const port = process.env.PORT || 80; // default port to listen
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app.use(express.static("public"));
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app.get("/", (req, res) => {
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res.send("Excalidraw collaboration server 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: ${port}`);
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});
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const io = socketIO(server, {
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handlePreflightRequest: function (req, res) {
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const headers = {
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"Access-Control-Allow-Headers": "Content-Type, Authorization",
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"Access-Control-Allow-Origin":
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(req.header && req.header.origin) || "https://excalidraw.com",
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"Access-Control-Allow-Credentials": true,
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};
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res.writeHead(200, headers);
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res.end();
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},
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});
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io.on("connection", (socket) => {
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ioDebug("connection established!");
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io.to(`${socket.id}`).emit("init-room");
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socket.on("join-room", (roomID) => {
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socketDebug(`${socket.id} has joined ${roomID}`);
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socket.join(roomID);
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if (io.sockets.adapter.rooms[roomID].length <= 1) {
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io.to(`${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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socketDebug(`${socket.id} sends update to ${roomID}`);
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socket.broadcast.to(roomID).emit("client-broadcast", encryptedData, iv);
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}
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);
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socket.on(
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"server-volatile-broadcast",
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(roomID: string, encryptedData: ArrayBuffer, iv: Uint8Array) => {
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socketDebug(`${socket.id} sends volatile update to ${roomID}`);
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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 in socket.rooms) {
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const clients = Object.keys(rooms[roomID].sockets).filter(
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(id) => id !== 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", () => {
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socket.removeAllListeners();
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});
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});
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