initial commit

src/lib/assets/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="107" height="128" viewBox="0 0 107 128"><title>svelte-logo</title><path d="M94.157 22.819c-10.4-14.885-30.94-19.297-45.792-9.835L22.282 29.608A29.92 29.92 0 0 0 8.764 49.65a31.5 31.5 0 0 0 3.108 20.231 30 30 0 0 0-4.477 11.183 31.9 31.9 0 0 0 5.448 24.116c10.402 14.887 30.942 19.297 45.791 9.835l26.083-16.624A29.92 29.92 0 0 0 98.235 78.35a31.53 31.53 0 0 0-3.105-20.232 30 30 0 0 0 4.474-11.182 31.88 31.88 0 0 0-5.447-24.116" style="fill:#ff3e00"/><path d="M45.817 106.582a20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.503 18 18 0 0 1 .624-2.435l.49-1.498 1.337.981a33.6 33.6 0 0 0 10.203 5.098l.97.294-.09.968a5.85 5.85 0 0 0 1.052 3.878 6.24 6.24 0 0 0 6.695 2.485 5.8 5.8 0 0 0 1.603-.704L69.27 76.28a5.43 5.43 0 0 0 2.45-3.631 5.8 5.8 0 0 0-.987-4.371 6.24 6.24 0 0 0-6.698-2.487 5.7 5.7 0 0 0-1.6.704l-9.953 6.345a19 19 0 0 1-5.296 2.326 20.72 20.72 0 0 1-22.237-8.243 19.17 19.17 0 0 1-3.277-14.502 17.99 17.99 0 0 1 8.13-12.052l26.081-16.623a19 19 0 0 1 5.3-2.329 20.72 20.72 0 0 1 22.237 8.243 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-.624 2.435l-.49 1.498-1.337-.98a33.6 33.6 0 0 0-10.203-5.1l-.97-.294.09-.968a5.86 5.86 0 0 0-1.052-3.878 6.24 6.24 0 0 0-6.696-2.485 5.8 5.8 0 0 0-1.602.704L37.73 51.72a5.42 5.42 0 0 0-2.449 3.63 5.79 5.79 0 0 0 .986 4.372 6.24 6.24 0 0 0 6.698 2.486 5.8 5.8 0 0 0 1.602-.704l9.952-6.342a19 19 0 0 1 5.295-2.328 20.72 20.72 0 0 1 22.237 8.242 19.17 19.17 0 0 1 3.277 14.503 18 18 0 0 1-8.13 12.053l-26.081 16.622a19 19 0 0 1-5.3 2.328" style="fill:#fff"/></svg>

src/lib/index.ts

@@ -0,0 +1 @@
+// place files you want to import through the `$lib` alias in this folder.

src/lib/webrtc.ts

@@ -0,0 +1,186 @@
+import { get } from 'svelte/store';
+import { ws } from '../stores/websocketStore';
+
+interface WebRTCPeerCallbacks {
+    onConnected: () => void;
+    onMessage: (message: string | ArrayBuffer) => void;
+    onDataChannelOpen: () => void;
+    onNegotiationNeeded: () => void;
+    onError: (error: any) => void;
+}
+
+export class WebRTCPeer {
+    private peer: RTCPeerConnection | null = null;
+    private dataChannel: RTCDataChannel | null = null;
+    private isInitiator: boolean;
+    private roomId: string;
+    private callbacks: WebRTCPeerCallbacks;
+
+    private iceServers = [
+        { urls: 'stun:stun.l.google.com:19302' },
+        { urls: 'stun:stun1.l.google.com:19302' },
+    ];
+
+    constructor(roomId: string, isInitiator: boolean, callbacks: WebRTCPeerCallbacks) {
+        this.roomId = roomId;
+        this.isInitiator = isInitiator;
+        this.callbacks = callbacks;
+    }
+
+    private sendIceCandidate(candidate: RTCIceCandidate) {
+        get(ws).send(JSON.stringify({
+            type: 'ice-candidate',
+            data: {
+                roomId: this.roomId,
+                candidate: candidate,
+            },
+        }))
+    }
+
+    public async initialize() {
+        // dont initialize twice
+        if (this.peer) return;
+
+        this.peer = new RTCPeerConnection({
+            iceServers: this.iceServers,
+        });
+
+        // 1. Initialize ICE candidates
+        this.peer.onicecandidate = (event) => {
+            if (event.candidate) {
+                this.sendIceCandidate(event.candidate);
+            }
+        }
+
+        this.peer.oniceconnectionstatechange = () => {
+            console.log('ICE connection state changed to:', this.peer?.iceConnectionState);
+            if (this.peer?.iceConnectionState === 'connected' || this.peer?.iceConnectionState === 'completed') {
+                this.callbacks.onConnected();
+            } else if (this.peer?.iceConnectionState === 'failed') {
+                this.callbacks.onError('ICE connection failed');
+            }
+        };
+
+        this.peer.onnegotiationneeded = () => {
+            this.callbacks.onNegotiationNeeded();
+        };
+
+        // 2. Create data channel
+        if (this.isInitiator) {
+            this.dataChannel = this.peer.createDataChannel('data-channel');
+            this.setupDataChannelEvents(this.dataChannel);
+            console.log('created data channel');
+        } else {
+            this.peer.ondatachannel = (event) => {
+                this.dataChannel = event.channel;
+                this.setupDataChannelEvents(this.dataChannel);
+                console.log('received data channel');
+            };
+        }
+    }
+
+    private setupDataChannelEvents(channel: RTCDataChannel) {
+        channel.onopen = () => {
+            console.log('data channel open');
+            this.callbacks.onDataChannelOpen();
+        };
+
+        channel.onmessage = (event) => {
+            console.log('data channel message:', event.data);
+            this.callbacks.onMessage(event.data);
+        };
+
+        channel.onclose = () => {
+            console.log('data channel closed');
+        };
+
+        channel.onerror = (error) => {
+            console.error('data channel error:', error);
+            this.callbacks.onError(error);
+        };
+    }
+
+    // SDP exchange
+    public async createOffer() {
+        if (!this.peer) throw new Error('Peer not initialized');
+
+        try {
+            const offer = await this.peer.createOffer();
+            await this.peer.setLocalDescription(offer);
+
+            get(ws).send(JSON.stringify({
+                type: 'offer',
+                data: {
+                    roomId: this.roomId,
+                    sdp: offer,
+                },
+            }));
+
+        } catch (error) {
+            console.error('Error creating offer:', error);
+            this.callbacks.onError(error);
+        }
+    }
+
+    // both peers call this to set the remote SDP
+    public async setRemoteDescription(sdp: RTCSessionDescriptionInit) {
+        if (!this.peer) throw new Error('Peer not initialized');
+
+        try {
+            await this.peer.setRemoteDescription(sdp);
+        } catch (error) {
+            console.error('Error setting remote description:', error);
+            this.callbacks.onError(error);
+        }
+    }
+
+    public async createAnswer() {
+        if (!this.peer) throw new Error('Peer not initialized');
+
+        try {
+            const answer = await this.peer.createAnswer();
+            await this.peer.setLocalDescription(answer);
+
+            get(ws).send(JSON.stringify({
+                type: 'answer',
+                data: {
+                    roomId: this.roomId,
+                    sdp: answer,
+                },
+            }));
+
+        } catch (error) {
+            console.error('Error creating answer:', error);
+            this.callbacks.onError(error);
+        }
+    }
+
+    public async addIceCandidate(candidate: RTCIceCandidateInit) {
+        if (!this.peer) throw new Error('Peer not initialized');
+
+        try {
+            await this.peer.addIceCandidate(new RTCIceCandidate(candidate));
+        } catch (error) {
+            console.error('Error adding ICE candidate:', error);
+            this.callbacks.onError(error);
+        }
+    }
+
+    public send(data: string | ArrayBuffer) {
+        if (!this.dataChannel || this.dataChannel.readyState !== 'open') throw new Error('Data channel not initialized');
+        this.dataChannel.send(data);
+    }
+
+    public close() {
+        if (this.dataChannel) {
+            this.dataChannel.close();
+        }
+
+        if (this.peer) {
+            this.peer.close();
+        }
+
+        this.peer = null;
+        this.dataChannel = null;
+    }
+}