import { spawn, type ChildProcess } from "node:child_process";

const SERVICE_TYPE = "_clanky._tcp"; const SERVICE_NAME = "Clanky Dashboard";

/**

• Advertises the Clanky dashboard via Bonjour/mDNS so the iOS app
• can auto-discover it on the local network.
• Uses macOS dns-sd command — no dependencies needed.
• TXT record includes:
• • tunnelUrl: the current Cloudflare tunnel URL (updated live)
• • version: "1" (protocol version for future compat)
• The dashboard token is NOT advertised — the user still enters it manually. */ export class BonjourAdvertiser { private port: number; private child: ChildProcess | null = null; private tunnelUrl = ""; private spawnFn: typeof spawn;

constructor(port: number, deps?: { spawnFn?: typeof spawn }) { this.port = port; this.spawnFn = deps?.spawnFn ?? spawn; }

start(tunnelUrl?: string): void { this.stop(); this.tunnelUrl = tunnelUrl ?? ""; if (!this.tunnelUrl) return; this.spawn(); }

/** Re-advertise with an updated tunnel URL (restarts dns-sd). */ updateTunnelUrl(tunnelUrl: string): void { if (tunnelUrl === this.tunnelUrl) return; this.tunnelUrl = tunnelUrl; // dns-sd doesn't support updating TXT records in-place, so restart this.stop(); if (!this.tunnelUrl) return; this.spawn(); }

stop(): void { const child = this.child; if (!child) return; this.child = null; try { child.kill("SIGTERM"); } catch { // already dead } }

private spawn(): void { // dns-sd -R [key=value ...] const txtRecords = ["version=1"]; if (this.tunnelUrl) { txtRecords.push(tunnelUrl=${this.tunnelUrl}); }

const child = this.spawnFn(
  "dns-sd",
  ["-R", SERVICE_NAME, SERVICE_TYPE, ".", String(this.port), ...txtRecords],
  { stdio: "ignore", windowsHide: true }
);
this.child = child;

child.on("error", () => {
  // dns-sd not available — silently degrade
  if (this.child === child) {
    this.child = null;
  }
});

child.on("close", () => {
  if (this.child === child) {
    this.child = null;
  }
});

} }