Basic functionality is here with a crappy ai generated frontend.

src/main.ts

@@ -0,0 +1,43 @@
+import { SpotifyWS } from "./spotify.ts"
+import { HeartbeatWS } from "./heartbeat.ts";
+import { PlayerManager } from "./playerManager.ts";
+import { serveFile } from "@std/http/file-server";
+import { UserWS } from "./user.ts";
+
+const USER_PATTERN = new URLPattern({pathname: "/ws/user"})
+const SPOTIFY_PATTERN = new URLPattern({pathname: "/ws/spotify"})
+const song = "spotify:track:2VxJVGiTsK6UyrxPJJ2lR9";
+
+function commonWs(req: Request) {
+  const { socket, response } = Deno.upgradeWebSocket(req);
+  return { socket, response };
+}
+
+declare global {
+  var spotify: SpotifyWS | undefined;
+  var playerManager: PlayerManager
+}
+globalThis.spotify = undefined;
+globalThis.playerManager = new PlayerManager()
+
+Deno.serve((req) => {
+  if (USER_PATTERN.exec(req.url)) {
+    const { socket, response } = commonWs(req);
+    new HeartbeatWS(socket);
+    new UserWS(socket)
+
+    return response
+  } else if (SPOTIFY_PATTERN.exec(req.url)) {
+    const { socket, response } = commonWs(req);
+
+    const spState = spotify?.ws.readyState;
+    if (spState !== undefined && spState !== WebSocket.CLOSED) spotify?.ws.close();
+
+    spotify = new SpotifyWS(socket, () => song);
+    new HeartbeatWS(socket);
+
+    return response
+  }
+
+  return serveFile(req, "./static/index.html")
+})