Add local screenshare app
Signed-off-by: Marcel Müller <neikos@neikos.email>
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8 changed files with 3552 additions and 0 deletions
406
lanshare/src/main.rs
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406
lanshare/src/main.rs
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use axum::{
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extract::{
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ws::{Message, WebSocket, WebSocketUpgrade},
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State,
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},
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response::{Html, IntoResponse},
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routing::get,
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Router,
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};
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use clap::Parser;
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use dashmap::DashMap;
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use futures::{SinkExt, StreamExt};
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use serde::{Deserialize, Serialize};
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use std::{net::SocketAddr, path::PathBuf, sync::Arc};
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use tokio::sync::broadcast;
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use tower_http::cors::CorsLayer;
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use tracing::{info, warn};
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use uuid::Uuid;
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use axum_server::tls_rustls::RustlsConfig;
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/// LAN Share - Peer-to-peer screen sharing for local networks
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///
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/// A lightweight WebRTC-based screen sharing application that runs entirely
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/// on your local network. No accounts, no cloud services — just open a
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/// browser and share.
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///
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/// The server only handles signaling (peer discovery, connection setup).
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/// Video/audio streams flow directly between browsers via WebRTC P2P.
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#[derive(Parser, Debug)]
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#[command(name = "lanshare")]
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#[command(version, about, long_about = None)]
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struct Args {
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/// IP address to bind to
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///
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/// Use 0.0.0.0 to listen on all network interfaces (default),
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/// 127.0.0.1 for localhost only, or a specific IP address.
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#[arg(short = 'H', long, default_value = "0.0.0.0", value_name = "IP")]
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host: String,
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/// Port to listen on
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#[arg(short, long, default_value_t = 8080, value_name = "PORT")]
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port: u16,
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/// Enable verbose/debug logging
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#[arg(short, long)]
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verbose: bool,
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/// Quiet mode - only show errors
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#[arg(short, long, conflicts_with = "verbose")]
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quiet: bool,
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#[arg(short, long)]
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certificate: PathBuf,
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#[arg(short, long)]
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key: PathBuf,
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}
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/// Messages sent between peers via the signaling server
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#[derive(Debug, Clone, Serialize, Deserialize)]
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#[serde(tag = "type", rename_all = "snake_case")]
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enum SignalMessage {
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/// Server assigns an ID to a new peer
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Welcome {
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peer_id: String,
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peers: Vec<PeerInfo>,
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},
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/// Peer announces themselves (with optional name)
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Announce {
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name: String,
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},
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/// Broadcast: a peer joined
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PeerJoined {
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peer_id: String,
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name: String,
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},
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/// Broadcast: a peer left
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PeerLeft {
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peer_id: String,
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},
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/// Peer started sharing their screen
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StartedSharing {
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peer_id: String,
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has_audio: bool,
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},
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/// Peer stopped sharing
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StoppedSharing {
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peer_id: String,
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},
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/// WebRTC offer (peer-to-peer, relayed by server)
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Offer {
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from: String,
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to: String,
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sdp: String,
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},
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/// WebRTC answer
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Answer {
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from: String,
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to: String,
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sdp: String,
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},
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/// ICE candidate
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IceCandidate {
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from: String,
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to: String,
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candidate: String,
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},
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/// Request to connect to a sharing peer
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RequestStream {
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from: String,
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to: String,
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},
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/// Error message
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Error {
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message: String,
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},
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}
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#[derive(Debug, Clone, Serialize, Deserialize)]
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struct PeerInfo {
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peer_id: String,
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name: String,
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is_sharing: bool,
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has_audio: bool,
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}
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/// State for a connected peer
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struct PeerState {
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name: String,
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is_sharing: bool,
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has_audio: bool,
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tx: broadcast::Sender<SignalMessage>,
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}
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/// Application state shared across all connections
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struct AppState {
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peers: DashMap<String, PeerState>,
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}
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impl AppState {
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fn new() -> Self {
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Self {
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peers: DashMap::new(),
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}
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}
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fn get_peer_list(&self) -> Vec<PeerInfo> {
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self.peers
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.iter()
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.map(|entry| PeerInfo {
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peer_id: entry.key().clone(),
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name: entry.value().name.clone(),
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is_sharing: entry.value().is_sharing,
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has_audio: entry.value().has_audio,
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})
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.collect()
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}
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fn broadcast(&self, msg: SignalMessage, exclude: Option<&str>) {
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for entry in self.peers.iter() {
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if exclude.map_or(true, |ex| entry.key() != ex) {
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let _ = entry.value().tx.send(msg.clone());
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}
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}
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}
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fn send_to(&self, peer_id: &str, msg: SignalMessage) {
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if let Some(peer) = self.peers.get(peer_id) {
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let _ = peer.tx.send(msg);
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}
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}
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}
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#[tokio::main]
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async fn main() {
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let args = Args::parse();
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tracing_subscriber::fmt()
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.with_env_filter(
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tracing_subscriber::EnvFilter::from_default_env()
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)
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.init();
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let state = Arc::new(AppState::new());
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let app = Router::new()
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.route("/", get(serve_index))
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.route("/ws", get(ws_handler))
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.layer(CorsLayer::permissive())
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.with_state(state);
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let addr: SocketAddr = format!("{}:{}", args.host, args.port)
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.parse()
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.expect("Invalid host:port combination");
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println!();
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println!(" ╭─────────────────────────────────────────╮");
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println!(" │ \x1b[1;33mLAN Share\x1b[0m │");
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println!(" │ P2P Screen Sharing for Local Networks │");
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println!(" ╰─────────────────────────────────────────╯");
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println!();
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println!(" \x1b[1mServer running at:\x1b[0m");
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println!(" → http://{}", addr);
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if args.host == "0.0.0.0" {
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if let Ok(local_ip) = local_ip_address::local_ip() {
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println!(" → http://{}:{}", local_ip, args.port);
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}
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}
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println!();
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println!(" \x1b[90mOpen this URL in browsers on your local network.\x1b[0m");
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println!(" \x1b[90mPress Ctrl+C to stop the server.\x1b[0m");
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println!();
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info!("Server starting on {}", addr);
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let config = RustlsConfig::from_pem_file(args.certificate, args.key).await.unwrap();
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axum_server::bind_rustls(addr, config).serve(app.into_make_service()).await.unwrap();
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}
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async fn serve_index() -> impl IntoResponse {
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Html(include_str!("../static/index.html"))
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}
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async fn ws_handler(ws: WebSocketUpgrade, State(state): State<Arc<AppState>>) -> impl IntoResponse {
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ws.on_upgrade(move |socket| handle_socket(socket, state))
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}
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async fn handle_socket(socket: WebSocket, state: Arc<AppState>) {
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let peer_id = Uuid::new_v4().to_string();
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let (tx, _) = broadcast::channel::<SignalMessage>(64);
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// Add peer to state with default name
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state.peers.insert(
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peer_id.clone(),
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PeerState {
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name: format!("Peer {}", &peer_id[..8]),
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is_sharing: false,
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has_audio: false,
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tx: tx.clone(),
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},
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);
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let peers = state.get_peer_list();
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info!("Peer {} connected ({} total peers)", &peer_id[..8], peers.len());
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let (mut sender, mut receiver) = socket.split();
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// Send welcome message with current peer list
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let welcome = SignalMessage::Welcome {
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peer_id: peer_id.clone(),
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peers: peers.into_iter().filter(|p| p.peer_id != peer_id).collect(),
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};
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if sender
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.send(Message::Text(serde_json::to_string(&welcome).unwrap().into()))
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.await
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.is_err()
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{
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state.peers.remove(&peer_id);
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return;
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}
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// Subscribe to broadcast messages for this peer
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let mut rx = tx.subscribe();
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let peer_id_clone = peer_id.clone();
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// Task to forward broadcast messages to this peer's websocket
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let mut send_task = tokio::spawn(async move {
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while let Ok(msg) = rx.recv().await {
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let text = serde_json::to_string(&msg).unwrap();
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if sender.send(Message::Text(text.into())).await.is_err() {
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break;
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}
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}
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});
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// Task to handle incoming messages from this peer
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let state_clone = state.clone();
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let peer_id_for_recv = peer_id.clone();
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let mut recv_task = tokio::spawn(async move {
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while let Some(Ok(msg)) = receiver.next().await {
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if let Message::Text(text) = msg {
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match serde_json::from_str::<SignalMessage>(&text) {
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Ok(signal) => {
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handle_signal(&state_clone, &peer_id_for_recv, signal).await;
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}
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Err(e) => {
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warn!("Failed to parse message from {}: {}", &peer_id_for_recv[..8], e);
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}
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}
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}
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}
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});
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// Wait for either task to complete (connection closed)
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tokio::select! {
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_ = &mut send_task => recv_task.abort(),
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_ = &mut recv_task => send_task.abort(),
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}
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// Clean up: remove peer and notify others
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if let Some((_, peer_state)) = state.peers.remove(&peer_id_clone) {
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info!(
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"Peer {} ({}) disconnected",
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&peer_id_clone[..8],
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peer_state.name
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);
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state.broadcast(
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SignalMessage::PeerLeft {
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peer_id: peer_id_clone,
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},
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None,
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);
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}
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}
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async fn handle_signal(state: &AppState, from_peer: &str, signal: SignalMessage) {
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match signal {
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SignalMessage::Announce { name } => {
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if let Some(mut peer) = state.peers.get_mut(from_peer) {
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peer.name = name.clone();
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}
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state.broadcast(
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SignalMessage::PeerJoined {
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peer_id: from_peer.to_string(),
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name,
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},
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Some(from_peer),
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);
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}
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SignalMessage::StartedSharing { has_audio, .. } => {
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if let Some(mut peer) = state.peers.get_mut(from_peer) {
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peer.is_sharing = true;
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peer.has_audio = has_audio;
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}
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state.broadcast(
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SignalMessage::StartedSharing {
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peer_id: from_peer.to_string(),
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has_audio,
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},
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Some(from_peer),
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);
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}
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SignalMessage::StoppedSharing { .. } => {
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if let Some(mut peer) = state.peers.get_mut(from_peer) {
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peer.is_sharing = false;
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peer.has_audio = false;
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}
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state.broadcast(
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SignalMessage::StoppedSharing {
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peer_id: from_peer.to_string(),
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},
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Some(from_peer),
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);
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}
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SignalMessage::Offer { to, sdp, .. } => {
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state.send_to(
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&to,
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SignalMessage::Offer {
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from: from_peer.to_string(),
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to: to.clone(),
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sdp,
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},
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);
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}
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SignalMessage::Answer { to, sdp, .. } => {
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state.send_to(
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&to,
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SignalMessage::Answer {
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from: from_peer.to_string(),
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to: to.clone(),
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sdp,
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},
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);
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}
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SignalMessage::IceCandidate { to, candidate, .. } => {
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state.send_to(
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&to,
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SignalMessage::IceCandidate {
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from: from_peer.to_string(),
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to: to.clone(),
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candidate,
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},
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);
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}
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SignalMessage::RequestStream { to, .. } => {
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state.send_to(
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&to,
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SignalMessage::RequestStream {
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from: from_peer.to_string(),
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to: to.clone(),
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},
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);
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}
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_ => {}
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}
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}
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