Add YouTube Music now-playing server, OBS overlay, and browser extension

Node.js server on port 9095 receives now-playing data via POST and broadcasts to connected WebSocket clients. Includes a Firefox/Chrome extension that scrapes YouTube Music's player bar every 3s, an OBS-ready transparent overlay with animated equalizer bars, and an image proxy to bypass CDN restrictions in OBS. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-12 11:55:04 -07:00
parent 74bbf4e9b6
commit e36c4d1a74
9 changed files with 1563 additions and 0 deletions
@@ -0,0 +1 @@
+node_modules/
@@ -0,0 +1,153 @@
+// YTMusic Now Playing - Content Script
+// Scrapes now-playing info from YouTube Music and sends it to a configurable server.
+
+(function () {
+  "use strict";
+
+  const DEFAULT_SERVER_URL = "http://localhost:9095";
+  const POLL_INTERVAL_MS = 3000;
+
+  let lastSentData = null;
+  let serverUrl = DEFAULT_SERVER_URL;
+
+  // Load server URL from storage
+  chrome.storage.sync.get({ serverUrl: DEFAULT_SERVER_URL }, (result) => {
+    serverUrl = result.serverUrl;
+  });
+
+  // Listen for storage changes so the popup can update the URL live
+  chrome.storage.onChanged.addListener((changes) => {
+    if (changes.serverUrl) {
+      serverUrl = changes.serverUrl.newValue || DEFAULT_SERVER_URL;
+    }
+  });
+
+  /**
+   * Scrape the current now-playing information from the YouTube Music DOM.
+   */
+  function scrapeNowPlaying() {
+    // Song title
+    const titleEl =
+      document.querySelector("ytmusic-player-bar .title") ||
+      document.querySelector(".ytmusic-player-bar .title");
+    const title = titleEl ? titleEl.textContent.trim() : null;
+
+    // Artist / byline
+    const bylineEl =
+      document.querySelector("ytmusic-player-bar .byline") ||
+      document.querySelector(".ytmusic-player-bar .byline");
+    const artist = bylineEl ? bylineEl.textContent.trim() : null;
+
+    // Album art URL
+    const artImg =
+      document.querySelector(
+        "ytmusic-player-bar .middle-controls .thumbnail-image-wrapper img"
+      ) ||
+      document.querySelector("ytmusic-player-bar .image img") ||
+      document.querySelector("ytmusic-player-bar img.image");
+    const albumArt = artImg ? artImg.src : null;
+
+    // Play state: the play-pause button's title attribute indicates the state.
+    // When music is playing the button shows "Pause" (because clicking it would pause).
+    const playPauseBtn = document.querySelector("#play-pause-button");
+    let isPlaying = false;
+    if (playPauseBtn) {
+      const btnTitle = (
+        playPauseBtn.getAttribute("title") ||
+        playPauseBtn.getAttribute("aria-label") ||
+        ""
+      ).toLowerCase();
+      // If the button says "pause", music is currently playing
+      isPlaying = btnTitle.includes("pause");
+    }
+
+    // Time info: usually shows "elapsed / duration" like "1:23 / 3:45"
+    const timeInfoEl =
+      document.querySelector("ytmusic-player-bar .time-info") ||
+      document.querySelector(".ytmusic-player-bar .time-info");
+    let elapsed = null;
+    let duration = null;
+    if (timeInfoEl) {
+      const timeText = timeInfoEl.textContent.trim();
+      const parts = timeText.split("/").map((s) => s.trim());
+      if (parts.length === 2) {
+        elapsed = parts[0];
+        duration = parts[1];
+      }
+    }
+
+    // If there's no title, nothing is playing
+    if (!title) {
+      return null;
+    }
+
+    return {
+      title,
+      artist,
+      albumArt,
+      isPlaying,
+      elapsed,
+      duration,
+    };
+  }
+
+  /**
+   * Check if two data objects are equal (shallow comparison of relevant fields).
+   */
+  function dataChanged(a, b) {
+    if (a === null && b === null) return false;
+    if (a === null || b === null) return true;
+    return (
+      a.title !== b.title ||
+      a.artist !== b.artist ||
+      a.albumArt !== b.albumArt ||
+      a.isPlaying !== b.isPlaying ||
+      a.elapsed !== b.elapsed ||
+      a.duration !== b.duration
+    );
+  }
+
+  /**
+   * Send data to the server.
+   */
+  async function sendToServer(data) {
+    const url = `${serverUrl}/api/now-playing`;
+    try {
+      const response = await fetch(url, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify(data),
+      });
+      if (!response.ok) {
+        console.warn(
+          `[YTMusic Now Playing] Server responded with ${response.status}`
+        );
+      }
+    } catch (err) {
+      console.warn(`[YTMusic Now Playing] Failed to send data:`, err.message);
+    }
+  }
+
+  /**
+   * Main polling loop.
+   */
+  function poll() {
+    const data = scrapeNowPlaying();
+    if (dataChanged(data, lastSentData)) {
+      lastSentData = data;
+      if (data) {
+        sendToServer(data);
+      } else {
+        // Send a "nothing playing" payload
+        sendToServer({ isPlaying: false });
+      }
+    }
+  }
+
+  // Start polling
+  setInterval(poll, POLL_INTERVAL_MS);
+  // Run once immediately
+  poll();
+
+  console.log("[YTMusic Now Playing] Content script loaded.");
+})();
@@ -0,0 +1,30 @@
+{
+  "manifest_version": 3,
+  "name": "YTMusic Now Playing",
+  "version": "1.0.0",
+  "description": "Sends currently playing song info to a Now Playing server",
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "ytmusic-now-playing@whats-that-music",
+      "strict_min_version": "109.0"
+    }
+  },
+  "permissions": ["storage"],
+  "host_permissions": [
+    "https://music.youtube.com/*",
+    "http://localhost:9095/*",
+    "http://localhost/*",
+    "http://127.0.0.1/*",
+    "https://*/*"
+  ],
+  "content_scripts": [
+    {
+      "matches": ["https://music.youtube.com/*"],
+      "js": ["content.js"],
+      "run_at": "document_idle"
+    }
+  ],
+  "action": {
+    "default_popup": "popup.html"
+  }
+}
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <style>
+    * { box-sizing: border-box; margin: 0; padding: 0; }
+    body {
+      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+      width: 320px;
+      padding: 16px;
+      background: #1a1a2e;
+      color: #e0e0e0;
+    }
+    h1 {
+      font-size: 14px;
+      font-weight: 600;
+      margin-bottom: 12px;
+      color: #ff4e45;
+    }
+    label {
+      display: block;
+      font-size: 12px;
+      margin-bottom: 4px;
+      color: #aaa;
+    }
+    input[type="text"] {
+      width: 100%;
+      padding: 8px 10px;
+      font-size: 13px;
+      border: 1px solid #333;
+      border-radius: 4px;
+      background: #16213e;
+      color: #e0e0e0;
+      outline: none;
+    }
+    input[type="text"]:focus {
+      border-color: #ff4e45;
+    }
+    button {
+      margin-top: 10px;
+      width: 100%;
+      padding: 8px;
+      font-size: 13px;
+      font-weight: 600;
+      border: none;
+      border-radius: 4px;
+      background: #ff4e45;
+      color: #fff;
+      cursor: pointer;
+    }
+    button:hover {
+      background: #e0433b;
+    }
+    #status {
+      margin-top: 10px;
+      font-size: 12px;
+      text-align: center;
+      min-height: 16px;
+    }
+    .status-ok { color: #4caf50; }
+    .status-err { color: #f44336; }
+    .status-info { color: #aaa; }
+  </style>
+</head>
+<body>
+  <h1>YTMusic Now Playing</h1>
+  <label for="serverUrl">Server URL</label>
+  <input type="text" id="serverUrl" placeholder="http://localhost:9095">
+  <button id="save">Save</button>
+  <div id="status" class="status-info"></div>
+  <script src="popup.js"></script>
+</body>
+</html>
@@ -0,0 +1,50 @@
+// YTMusic Now Playing - Popup Script
+
+(function () {
+  "use strict";
+
+  const DEFAULT_SERVER_URL = "http://localhost:9095";
+  const serverUrlInput = document.getElementById("serverUrl");
+  const saveBtn = document.getElementById("save");
+  const statusEl = document.getElementById("status");
+
+  function setStatus(message, type) {
+    statusEl.textContent = message;
+    statusEl.className = `status-${type}`;
+  }
+
+  // Load saved URL on popup open
+  chrome.storage.sync.get({ serverUrl: DEFAULT_SERVER_URL }, (result) => {
+    serverUrlInput.value = result.serverUrl;
+    checkConnection(result.serverUrl);
+  });
+
+  // Save button handler
+  saveBtn.addEventListener("click", () => {
+    const url = serverUrlInput.value.trim().replace(/\/+$/, "");
+    if (!url) {
+      setStatus("Please enter a valid URL.", "err");
+      return;
+    }
+    chrome.storage.sync.set({ serverUrl: url }, () => {
+      setStatus("Saved!", "ok");
+      checkConnection(url);
+    });
+  });
+
+  // Check connection to the server
+  async function checkConnection(url) {
+    try {
+      const response = await fetch(`${url}/api/now-playing`, {
+        method: "GET",
+      });
+      if (response.ok) {
+        setStatus("Connected to server.", "ok");
+      } else {
+        setStatus(`Server returned ${response.status}.`, "err");
+      }
+    } catch (err) {
+      setStatus("Cannot reach server.", "err");
+    }
+  }
+})();
@@ -0,0 +1,292 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>Now Playing Overlay</title>
+<link rel="preconnect" href="https://fonts.googleapis.com">
+<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap" rel="stylesheet">
+<style>
+  *, *::before, *::after {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+  }
+
+  body {
+    background: transparent;
+    overflow: hidden;
+    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+    width: 100vw;
+    height: 100vh;
+    display: flex;
+    align-items: flex-end;
+    justify-content: flex-start;
+  }
+
+  #overlay {
+    position: fixed;
+    bottom: 24px;
+    left: 24px;
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    padding: 10px 18px 10px 14px;
+    background: rgba(0, 0, 0, 0.7);
+    backdrop-filter: blur(16px);
+    -webkit-backdrop-filter: blur(16px);
+    border: 1px solid rgba(255, 255, 255, 0.08);
+    border-radius: 14px;
+    transform: translateX(-120%);
+    opacity: 0;
+    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1),
+                opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1);
+    max-width: 420px;
+  }
+
+  #overlay.visible {
+    transform: translateX(0);
+    opacity: 1;
+  }
+
+  /* Equalizer bars */
+  .equalizer {
+    display: flex;
+    align-items: flex-end;
+    gap: 2.5px;
+    height: 18px;
+    flex-shrink: 0;
+  }
+
+  .equalizer .bar {
+    width: 3px;
+    border-radius: 1.5px;
+    background: #1ed760;
+    animation: eq-bounce 1s ease-in-out infinite;
+  }
+
+  .equalizer .bar:nth-child(1) {
+    height: 60%;
+    animation-delay: 0s;
+  }
+  .equalizer .bar:nth-child(2) {
+    height: 100%;
+    animation-delay: 0.15s;
+  }
+  .equalizer .bar:nth-child(3) {
+    height: 40%;
+    animation-delay: 0.3s;
+  }
+  .equalizer .bar:nth-child(4) {
+    height: 80%;
+    animation-delay: 0.45s;
+  }
+
+  @keyframes eq-bounce {
+    0%, 100% { transform: scaleY(0.3); }
+    50% { transform: scaleY(1); }
+  }
+
+  .equalizer.paused .bar {
+    animation-play-state: paused;
+    transform: scaleY(0.3);
+  }
+
+  /* Album art */
+  .album-art {
+    width: 52px;
+    height: 52px;
+    border-radius: 8px;
+    object-fit: cover;
+    flex-shrink: 0;
+    background: rgba(255, 255, 255, 0.1);
+  }
+
+  /* Text container */
+  .track-info {
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    gap: 2px;
+    min-width: 0;
+    padding-right: 4px;
+  }
+
+  .track-title {
+    color: #ffffff;
+    font-size: 14px;
+    font-weight: 600;
+    line-height: 1.3;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+
+  .track-artist {
+    color: rgba(255, 255, 255, 0.65);
+    font-size: 12px;
+    font-weight: 400;
+    line-height: 1.3;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+
+  /* Transition for content swap */
+  .track-info.swapping {
+    opacity: 0;
+    transform: translateY(4px);
+    transition: opacity 0.2s ease, transform 0.2s ease;
+  }
+
+  .track-info.swapped {
+    opacity: 1;
+    transform: translateY(0);
+    transition: opacity 0.3s ease, transform 0.3s ease;
+  }
+</style>
+</head>
+<body>
+<div id="overlay">
+  <div class="equalizer" id="equalizer">
+    <div class="bar"></div>
+    <div class="bar"></div>
+    <div class="bar"></div>
+    <div class="bar"></div>
+  </div>
+  <img class="album-art" id="albumArt" src="" alt="">
+  <div class="track-info" id="trackInfo">
+    <div class="track-title" id="trackTitle"></div>
+    <div class="track-artist" id="trackArtist"></div>
+  </div>
+</div>
+
+<script>
+(function () {
+  const overlay = document.getElementById('overlay');
+  const albumArt = document.getElementById('albumArt');
+  const trackTitle = document.getElementById('trackTitle');
+  const trackArtist = document.getElementById('trackArtist');
+  const trackInfo = document.getElementById('trackInfo');
+  const equalizer = document.getElementById('equalizer');
+
+  let currentTrackKey = '';
+  let ws = null;
+  let reconnectTimer = null;
+
+  function updateDisplay(data) {
+    const hasTrack = data.title && data.isPlaying;
+    const newTrackKey = data.title + '|' + data.artist;
+
+    if (!hasTrack) {
+      overlay.classList.remove('visible');
+      equalizer.classList.add('paused');
+      return;
+    }
+
+    // If the track changed, do a swap animation
+    if (newTrackKey !== currentTrackKey) {
+      currentTrackKey = newTrackKey;
+
+      // If already visible, animate out then in
+      if (overlay.classList.contains('visible')) {
+        trackInfo.classList.add('swapping');
+        trackInfo.classList.remove('swapped');
+
+        setTimeout(() => {
+          applyTrackData(data);
+          trackInfo.classList.remove('swapping');
+          trackInfo.classList.add('swapped');
+        }, 200);
+      } else {
+        applyTrackData(data);
+        trackInfo.classList.add('swapped');
+      }
+    }
+
+    // Show overlay and set equalizer state
+    overlay.classList.add('visible');
+    equalizer.classList.toggle('paused', !data.isPlaying);
+  }
+
+  function applyTrackData(data) {
+    trackTitle.textContent = data.title || '';
+    trackArtist.textContent = data.artist || '';
+
+    if (data.albumArt) {
+      albumArt.src = '/api/image-proxy?url=' + encodeURIComponent(data.albumArt);
+      albumArt.style.display = 'block';
+    } else {
+      albumArt.style.display = 'none';
+    }
+  }
+
+  // Derive WebSocket URL from page location
+  function getWsUrl() {
+    const proto = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+    return proto + '//' + window.location.host;
+  }
+
+  function connectWebSocket() {
+    if (ws) {
+      try { ws.close(); } catch (e) {}
+    }
+
+    try {
+      ws = new WebSocket(getWsUrl());
+    } catch (e) {
+      scheduleReconnect();
+      return;
+    }
+
+    ws.addEventListener('open', () => {
+      if (reconnectTimer) {
+        clearTimeout(reconnectTimer);
+        reconnectTimer = null;
+      }
+    });
+
+    ws.addEventListener('message', (event) => {
+      try {
+        const data = JSON.parse(event.data);
+        updateDisplay(data);
+      } catch (e) {}
+    });
+
+    ws.addEventListener('close', () => {
+      scheduleReconnect();
+    });
+
+    ws.addEventListener('error', () => {
+      try { ws.close(); } catch (e) {}
+    });
+  }
+
+  function scheduleReconnect() {
+    if (reconnectTimer) return;
+    reconnectTimer = setTimeout(() => {
+      reconnectTimer = null;
+      connectWebSocket();
+    }, 5000);
+  }
+
+  // Initial fetch to get current state
+  async function fetchInitialState() {
+    try {
+      const baseUrl = window.location.origin;
+      const resp = await fetch(baseUrl + '/api/now-playing');
+      if (resp.ok) {
+        const data = await resp.json();
+        updateDisplay(data);
+      }
+    } catch (e) {}
+  }
+
+  // Start
+  fetchInitialState();
+  connectWebSocket();
+})();
+</script>
+</body>
+</html>
@@ -0,0 +1,849 @@
+{
+  "name": "ytmusic-now-playing",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "ytmusic-now-playing",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "express": "^5.2.1",
+        "ws": "^8.20.0"
+      }
+    },
+    "node_modules/accepts": {
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+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "^3.0.0",
+        "negotiator": "^1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/body-parser": {
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+      "engines": {
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+      }
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+      "license": "MIT",
+      "engines": {
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+      }
+    },
+    "node_modules/wrappy": {
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+      "license": "ISC"
+    },
+    "node_modules/ws": {
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+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.20.0.tgz",
+      "integrity": "sha512-sAt8BhgNbzCtgGbt2OxmpuryO63ZoDk/sqaB/znQm94T4fCEsy/yV+7CdC1kJhOU9lboAEU7R3kquuycDoibVA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    }
+  }
+}
@@ -0,0 +1,17 @@
+{
+  "name": "ytmusic-now-playing",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node server/index.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^5.2.1",
+    "ws": "^8.20.0"
+  }
+}
@@ -0,0 +1,98 @@
+const express = require('express');
+const http = require('http');
+const path = require('path');
+const { WebSocketServer } = require('ws');
+
+const app = express();
+const server = http.createServer(app);
+const wss = new WebSocketServer({ server });
+
+const PORT = 9095;
+
+// Current now-playing state
+let currentState = {
+  title: '',
+  artist: '',
+  album: '',
+  albumArt: '',
+  isPlaying: false,
+  progress: 0,
+  duration: 0,
+};
+
+// CORS middleware
+app.use((req, res, next) => {
+  res.header('Access-Control-Allow-Origin', '*');
+  res.header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
+  res.header('Access-Control-Allow-Headers', 'Content-Type');
+  if (req.method === 'OPTIONS') {
+    return res.sendStatus(204);
+  }
+  next();
+});
+
+// Parse JSON bodies
+app.use(express.json());
+
+// Serve static files from the overlay directory
+app.use(express.static(path.join(__dirname, '..', 'overlay')));
+
+// Image proxy — fetches album art server-side so OBS can display it
+app.get('/api/image-proxy', async (req, res) => {
+  const url = req.query.url;
+  if (!url) return res.status(400).send('Missing url parameter');
+  try {
+    const response = await fetch(url);
+    if (!response.ok) return res.status(response.status).send('Upstream error');
+    res.set('Content-Type', response.headers.get('content-type') || 'image/jpeg');
+    res.set('Cache-Control', 'public, max-age=3600');
+    const buffer = await response.arrayBuffer();
+    res.send(Buffer.from(buffer));
+  } catch (err) {
+    res.status(502).send('Failed to fetch image');
+  }
+});
+
+// Health check
+app.get('/api/health', (req, res) => {
+  res.json({ status: 'ok' });
+});
+
+// Get current now-playing state
+app.get('/api/now-playing', (req, res) => {
+  res.json(currentState);
+});
+
+// Update now-playing state
+app.post('/api/now-playing', (req, res) => {
+  const { title, artist, album, albumArt, isPlaying, progress, duration } = req.body;
+
+  currentState = {
+    title: title ?? currentState.title,
+    artist: artist ?? currentState.artist,
+    album: album ?? currentState.album,
+    albumArt: albumArt ?? currentState.albumArt,
+    isPlaying: isPlaying ?? currentState.isPlaying,
+    progress: progress ?? currentState.progress,
+    duration: duration ?? currentState.duration,
+  };
+
+  // Broadcast to all connected WebSocket clients
+  const message = JSON.stringify(currentState);
+  wss.clients.forEach((client) => {
+    if (client.readyState === 1) { // WebSocket.OPEN
+      client.send(message);
+    }
+  });
+
+  res.json(currentState);
+});
+
+// Send current state to newly connected WebSocket clients
+wss.on('connection', (ws) => {
+  ws.send(JSON.stringify(currentState));
+});
+
+server.listen(PORT, () => {
+  console.log(`Server running on http://localhost:${PORT}`);
+});