wip webrtc

packages/app/package.json

@@ -38,6 +38,7 @@
     "react-tag-input-component": "^2.0.2",
     "react-textarea-autosize": "^8.4.0",
     "recharts": "^2.8.0",
+    "socket.io-client": "^4.7.2",
     "three": "^0.157.0",
     "use-long-press": "^3.2.0",
     "use-sync-external-store": "^1.2.0",

packages/app/src/Element/Event/Create/util.ts

@@ -1,5 +1,6 @@
 import { NostrEvent, OkResponse, SystemInterface } from "@snort/system";
 import { removeUndefined } from "@snort/shared";
+import {getWebRtcPool} from "@/webrtc";
 
 export async function sendEventToRelays(
   system: SystemInterface,
@@ -8,6 +9,7 @@ export async function sendEventToRelays(
   setResults?: (x: Array<OkResponse>) => void,
 ) {
   console.log("sendEventToRelays", ev, customRelays);
+  getWebRtcPool()?.send(ev);
   if (customRelays) {
     return removeUndefined(
       await Promise.all(

packages/app/src/index.tsx

@@ -1,6 +1,7 @@
 import "./index.css";
 import "@szhsin/react-menu/dist/index.css";
 import "./fonts/inter.css";
+import "./webrtc";
 
 import {
   compress,

packages/app/src/webrtc/WebRTCConnection.ts

@@ -0,0 +1,106 @@
+import { Socket } from "socket.io-client";
+import EventEmitter from "eventemitter3";
+
+export class WebRTCConnection extends EventEmitter {
+  private peerConnection: RTCPeerConnection;
+  private dataChannel: RTCDataChannel;
+
+  constructor(private socket: Socket, configuration: RTCConfiguration, public peerId: string) {
+    super();
+    this.peerConnection = new RTCPeerConnection(configuration);
+    this.dataChannel = this.peerConnection.createDataChannel("data");
+    this.registerPeerConnectionEvents();
+    this.setupDataChannel();
+  }
+
+  private log(...args: any[]): void {
+    console.log(this.peerId, ...args);
+  }
+
+  public async handleOffer(offer: RTCSessionDescriptionInit): Promise<void> {
+    this.log('Received offer', offer);
+    await this.peerConnection.setRemoteDescription(new RTCSessionDescription(offer));
+    await this.sendLocalDescription('answer');
+  }
+
+  public async handleAnswer(answer: RTCSessionDescriptionInit): Promise<void> {
+    this.log('Received answer', answer);
+    await this.peerConnection.setRemoteDescription(new RTCSessionDescription(answer));
+  }
+
+  public handleCandidate(candidate: RTCIceCandidateInit): void {
+    this.log('Received ICE candidate', candidate);
+    this.peerConnection.addIceCandidate(new RTCIceCandidate(candidate));
+  }
+
+  private async sendLocalDescription(type: 'offer' | 'answer'): Promise<void> {
+    let description;
+    if (type === 'offer') {
+      description = await this.peerConnection.createOffer();
+    } else {
+      description = await this.peerConnection.createAnswer();
+    }
+    await this.peerConnection.setLocalDescription(description);
+    this.socket.emit(type, { [type]: description, recipient: this.peerId });
+    this.log(`Sent ${type}`, description);
+  }
+
+  private setupDataChannel(): void {
+    this.dataChannel.onopen = () => this.log('Data channel opened');
+    this.dataChannel.onclose = () => this.log('Data channel closed');
+    this.dataChannel.onmessage = event => this.handleDataChannelMessage(event);
+  }
+
+  private handleDataChannelMessage(event: MessageEvent): void {
+    this.log(`-> "${event.data}"`);
+    if (event.data === 'ping') {
+      this.send('pong');
+    } else {
+      try {
+        const data = JSON.parse(event.data);
+        this.emit('event', data);
+      } catch (e) {
+        // Ignore
+      }
+    }
+  }
+
+  public send(data: any): void {
+    if (this.dataChannel.readyState === 'open') {
+      this.log(`<- "${data}"`);
+      this.dataChannel.send(data);
+    }
+  }
+
+  public async handleHello(): Promise<void> {
+    if (this.peerConnection.connectionState === 'new') {
+      await this.sendLocalDescription('offer');
+    }
+  }
+
+  private registerPeerConnectionEvents(): void {
+    this.peerConnection.onicecandidate = event => {
+      if (event.candidate) {
+        this.log('Local ICE candidate:', event.candidate);
+        this.socket.emit('candidate', { candidate: event.candidate.toJSON(), recipient: this.peerId });
+      }
+    };
+
+    this.peerConnection.oniceconnectionstatechange = () => {
+      this.log('ICE Connection State Change:', this.peerConnection.iceConnectionState);
+    };
+
+    this.peerConnection.onconnectionstatechange = () => {
+      this.log('WebRTC Connection State Change:', this.peerConnection.connectionState);
+    };
+
+    this.peerConnection.ondatachannel = event => {
+      this.dataChannel = event.channel;
+      this.setupDataChannel();
+    };
+  }
+
+  public close(): void {
+    this.peerConnection.close();
+  }
+}

packages/app/src/webrtc/WebRTCPool.ts

@@ -0,0 +1,86 @@
+import {io, Socket} from 'socket.io-client';
+import {WebRTCConnection} from '@/webrtc/WebRTCConnection';
+import EventEmitter from "eventemitter3";
+
+const MAX_CONNECTIONS = 5;
+
+class WebRTCPool extends EventEmitter {
+  private signalingServer: Socket;
+  private peers: Map<string, WebRTCConnection> = new Map();
+  private configuration: RTCConfiguration;
+  private peerId: string;
+
+  constructor(serverUrl: string, configuration: RTCConfiguration = {}, peerId: string) {
+    super();
+    this.signalingServer = io(serverUrl);
+    this.configuration = configuration;
+    this.peerId = peerId;
+    this.registerSocketEvents();
+  }
+
+  private sayHello(): void {
+    this.signalingServer.emit('hello', this.peerId);
+  }
+
+  public send(data: any, recipients?: string[]): void {
+    this.peers.forEach(conn => {
+      if (!recipients || recipients.includes(conn.peerId)) {
+        try {
+          conn.send(typeof data === 'string' ? data : JSON.stringify(data));
+        } catch (e) {
+          console.error(e);
+        }
+      }
+    });
+  }
+
+  public createConnection(peerId: string): WebRTCConnection {
+    if (this.peers.size >= MAX_CONNECTIONS) {
+      throw new Error('Maximum connections reached');
+    }
+    const connection = new WebRTCConnection(this.signalingServer, this.configuration, peerId);
+    connection.on('event', (event: any) => this.emit('event', event));
+    this.peers.set(peerId, connection);
+    return connection;
+  }
+
+  private handleConnectionEvent(sender: string, action: (connection: WebRTCConnection) => Promise<void>): void {
+    if (sender === this.peerId || this.peers.size >= MAX_CONNECTIONS) return;
+    const connection = this.peers.get(sender) ?? this.createConnection(sender);
+    action(connection);
+  }
+
+  private registerSocketEvents(): void {
+    this.signalingServer.on('connect', () => {
+      console.log('Connected to signaling server');
+      this.sayHello();
+    });
+
+    this.signalingServer.on('offer', ({offer, sender}: { offer: RTCSessionDescriptionInit; sender: string }) => {
+      this.handleConnectionEvent(sender, async conn => await conn.handleOffer(offer));
+    });
+
+    this.signalingServer.on('answer', ({answer, sender}: { answer: RTCSessionDescriptionInit; sender: string }) => {
+      this.handleConnectionEvent(sender, async conn => await conn.handleAnswer(answer));
+    });
+
+    this.signalingServer.on('candidate', ({candidate, sender}: { candidate: RTCIceCandidateInit; sender: string }) => {
+      this.handleConnectionEvent(sender, conn => conn.handleCandidate(candidate));
+    });
+
+    this.signalingServer.on('hello', (sender: string) => {
+      console.log('Received hello from', sender);
+      this.handleConnectionEvent(sender, conn => conn.handleHello());
+    });
+  }
+  
+  public close(): void {
+    console.log('closing pool');
+    this.signalingServer.close();
+    for (const conn of this.peers.values()) {
+      conn.close();
+    }
+  }
+}
+
+export default WebRTCPool;

packages/app/src/webrtc/index.ts

@@ -0,0 +1,25 @@
+import {LoginStore} from "@/Login";
+import WebRTCPool from "@/webrtc/WebRTCPool";
+
+let publicKey: string | undefined;
+let pool: WebRTCPool | undefined;
+let interval: NodeJS.Timeout | undefined;
+
+LoginStore.hook(() => {
+  const login = LoginStore.takeSnapshot();
+  if (login.publicKey && !login.readonly && login.publicKey !== publicKey) {
+    publicKey = login.publicKey;
+    if (location.hostname === 'localhost') {
+      pool?.close();
+      interval && clearInterval(interval);
+      pool = new WebRTCPool('http://localhost:3000', {
+        iceServers: [{ urls: 'stun:localhost:3478' }],
+      }, login.publicKey);
+      interval = setInterval(() => pool?.send('ping'), 10000);
+    }
+  }
+});
+
+export function getWebRtcPool(): WebRTCPool | undefined {
+  return pool;
+}

packages/system/src/nostr-system.ts

@@ -193,7 +193,6 @@ export class NostrSystem extends EventEmitter<NostrSystemEvents> implements Syst
 
   #onEvent(sub: string, ev: TaggedNostrEvent) {
     this.#relayMetrics.onEvent(ev.relays[0]);
-    this.emit("event", ev);
 
     if (!EventExt.isValid(ev)) {
       this.#log("Rejecting invalid event %O", ev);
@@ -207,6 +206,8 @@ export class NostrSystem extends EventEmitter<NostrSystemEvents> implements Syst
       }
     }
 
+    this.emit("event", ev);
+
     for (const [, v] of this.Queries) {
       v.handleEvent(sub, ev);
     }

packages/webrtc-server/README.md

@@ -0,0 +1,8 @@
+# webrtc-server
+
+```
+yarn
+yarn start
+```
+
+Websocket (socket.io) based signaling server for WebRTC.

packages/webrtc-server/index.js

@@ -0,0 +1,56 @@
+const PORT = process.env.PORT || 3000;
+const io = require('socket.io')(PORT, {
+  cors: {
+    origin: "*",
+    methods: ["GET", "POST"]
+  }
+});
+
+const peerSocketMap = new Map();
+const socketPeerMap = new Map();
+
+io.on('connection', socket => {
+  console.log(`New client connected, socket ID: ${socket.id}`);
+
+  const emitToTarget = (eventType, data, recipient) => {
+    const targetSocketId = peerSocketMap.get(recipient);
+    const sender = socketPeerMap.get(socket.id);
+    if (sender && targetSocketId) {
+      io.to(targetSocketId).emit(eventType, {...data, sender});
+    }
+  };
+
+  socket.on('offer', data => emitToTarget('offer', data, data.recipient));
+  socket.on('answer', data => emitToTarget('answer', data, data.recipient));
+  socket.on('candidate', data => emitToTarget('candidate', data, data.recipient));
+
+  socket.on('hello', peerId => {
+    console.log(`Received hello from ${peerId}`);
+    peerSocketMap.set(peerId, socket.id);
+    socketPeerMap.set(socket.id, peerId);
+    socket.broadcast.emit('hello', peerId);
+  });
+
+  socket.on('disconnect', () => {
+    peerSocketMap.delete(socketPeerMap.get(socket.id));
+    socketPeerMap.delete(socket.id);
+    console.log(`Client disconnected, socket ID: ${socket.id}`);
+  });
+});
+
+console.log(`Signaling server running on port ${PORT}`);
+
+const Ministun = require("ministun");
+
+const stunConfig = {
+	udp4: true,
+	udp6: true,
+	port: 3478,
+	log: console.log,
+	err: console.err,
+	sw: true
+};
+
+const server = new Ministun(stunConfig);
+
+console.log(`STUN server running on port ${stunConfig.port}`)

packages/webrtc-server/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "nostr-webrtc-server",
+  "dependencies": {
+    "ministun": "^1.0.6",
+    "nostr-tools": "^2.0.2",
+    "socket.io": "^4.7.2"
+  },
+  "scripts": {
+    "start": "node index.js"
+  }
+}

yarn.lock

@@ -2557,7 +2557,14 @@ __metadata:
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@@ -2566,6 +2573,22 @@ __metadata:
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@@ -2943,6 +2984,7 @@ __metadata:
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+    socket.io-client: ^4.7.2
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