71 lines
1.9 KiB
TypeScript
71 lines
1.9 KiB
TypeScript
// source: https://github.com/idlewinn/collab-server/blob/master/src/index.ts
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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 app = express();
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const port = process.env.PORT || 8080;
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app.get("/", (req, res) => {
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res.send("Hi, excalidraw-room!");
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});
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const server = http.createServer(app);
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server.listen(port, () => {
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console.log(`listening on port: ${port}`);
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});
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const io = socketIO(server, {
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handlePreflightRequest: function(req, res) {
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var headers = {
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"Access-Control-Allow-Headers": "Content-Type, Authorization",
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"Access-Control-Allow-Origin": req.header ? req.header.origin : "*",
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"Access-Control-Allow-Credentials": true
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};
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res.writeHead(200, headers);
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res.end();
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}
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});
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io.on("connection", socket => {
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console.log("connection established!");
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io.to(`${socket.id}`).emit("init-room");
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socket.on("join-room", roomID => {
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console.log(`${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-count",
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io.sockets.adapter.rooms[roomID].length
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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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console.log(`${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("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 remaining = rooms[roomID].length - 1;
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if (remaining > 0) {
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socket.broadcast.to(roomID).emit("room-user-count", remaining);
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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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