javis_bot/bot/scripts/stream-test/broadcast-helper.mjs

// Persistent broadcast browser helper. Connects over CDP and injects one
// watcher into every tab (current and future) that:
//   1. Auto-skips YouTube ads - clicks "Skip ad" the instant it appears, closes
//      overlay ads, and fast-forwards unskippable ads (seek-to-end + 16x + mute)
//      so they clear in ~1s. The pre-ad muted/playbackRate are SAVED and
//      RESTORED when the ad ends, so the main video is never left muted/fast.
//   2. Applies the subtitle rule per video: captions OFF by default, but a
//      Korean track is turned ON when the video offers one. Runs once per video.
// Self-contained: no extension, no network/hosts changes. Reconnects across
// Chrome restarts.
//
//   node bot/scripts/stream-test/broadcast-helper.mjs   (CDP_PORT, default 9222)
import { chromium } from 'playwright';

const CDP = process.env.CDP_PORT || '9222';

const WATCH = `(() => {
  if (window.__ytBroadcast) return; window.__ytBroadcast = true;
  let adSaved = null;            // {muted, rate} captured when an ad starts
  const capWant = {};            // videoId -> 'ko' | 'off' (desired, decided once)
  const capTries = {};           // videoId -> attempts to read the tracklist

  const adTick = () => {
    const p = document.getElementById('movie_player');
    const adShowing = !!(p && p.classList && p.classList.contains('ad-showing'));
    const v = document.querySelector('video');
    const skip = document.querySelector(
      '.ytp-ad-skip-button, .ytp-ad-skip-button-modern, .ytp-skip-ad-button, .ytp-ad-skip-button-container button');
    if (skip) skip.click();
    document.querySelectorAll('.ytp-ad-overlay-close-button, .ytp-ad-overlay-close-container button').forEach((b) => b.click());
    if (adShowing) {
      if (adSaved === null && v) adSaved = { muted: v.muted, rate: v.playbackRate };
      if (v) {
        v.muted = true;
        if (isFinite(v.duration) && v.duration > 0) { try { v.currentTime = v.duration; } catch {} }
        v.playbackRate = 16;
      }
    } else if (adSaved !== null && v) {
      // ad finished: restore exactly what the user had before the ad
      v.muted = adSaved.muted;
      v.playbackRate = adSaved.rate;
      adSaved = null;
    }
    return adShowing;
  };

  const capTick = (adShowing) => {
    if (adShowing) return;       // don't touch captions while an ad plays
    const p = document.getElementById('movie_player');
    if (!p || !p.getOption || !p.getVideoData) return;
    const vid = p.getVideoData().video_id;
    if (!vid) return;
    // Decide the desired state once per video (off, or Korean if offered).
    if (capWant[vid] === undefined) {
      capTries[vid] = (capTries[vid] || 0) + 1;
      let tracks = [];
      try { p.loadModule('captions'); tracks = p.getOption('captions', 'tracklist') || []; } catch {}
      if (tracks.length) capWant[vid] = tracks.find((t) => /^ko/i.test(t.languageCode || '')) ? 'ko' : 'off';
      else if (capTries[vid] > 16) capWant[vid] = 'off'; // no tracks: keep it off
      else return;               // tracklist not ready yet
    }
    // Enforce it every tick so YouTube cannot silently re-enable captions.
    let curLc = '';
    try { const c = p.getOption('captions', 'track'); curLc = (c && c.languageCode) || ''; } catch {}
    if (capWant[vid] === 'ko') {
      if (!/^ko/i.test(curLc)) {
        let tracks = []; try { tracks = p.getOption('captions', 'tracklist') || []; } catch {}
        const ko = tracks.find((t) => /^ko/i.test(t.languageCode || ''));
        if (ko) { try { p.setOption('captions', 'track', { languageCode: ko.languageCode }); } catch {} }
      }
    } else if (curLc) {          // want off but a track is on -> turn it off
      try { p.setOption('captions', 'track', {}); } catch {}
      try { p.unloadModule('captions'); } catch {}
    }
  };

  setInterval(() => {
    let adShowing = false;
    try { adShowing = adTick(); } catch {}
    try { capTick(adShowing); } catch {}
  }, 250);
})();`;

async function arm(page) {
  try { await page.addInitScript(WATCH); } catch {}        // survives navigations
  try { await page.evaluate(WATCH); } catch {}             // arm the already-loaded doc
}

async function session() {
  const b = await chromium.connectOverCDP(`http://localhost:${CDP}`);
  const ctx = b.contexts()[0];
  for (const p of ctx.pages()) await arm(p);
  ctx.on('page', arm);                                     // new tabs

  // Broadcast-wide: when any tab enters HTML5 fullscreen (a video 'f'), hide
  // Chrome's toolbar by putting the WINDOW into Chrome-initiated fullscreen -
  // xfwm4 won't hide it on HTML5 fullscreen alone, so the address bar would
  // otherwise show on the broadcast. Restore when fullscreen exits.
  let winFs = false;
  const cdp = await b.newBrowserCDPSession();
  const setWindowFs = async (fs) => {
    try {
      const { targetInfos } = await cdp.send('Target.getTargets');
      const t = targetInfos.find((x) => x.type === 'page' && x.url.startsWith('http'));
      if (!t) return;
      const { windowId } = await cdp.send('Browser.getWindowForTarget', { targetId: t.targetId });
      await cdp.send('Browser.setWindowBounds', { windowId, bounds: { windowState: fs ? 'fullscreen' : 'normal' } });
      winFs = fs;
    } catch { /* best-effort */ }
  };
  const fsTimer = setInterval(async () => {
    try {
      let anyFs = false;
      for (const p of ctx.pages()) {
        if (await p.evaluate(() => !!document.fullscreenElement).catch(() => false)) { anyFs = true; break; }
      }
      if (anyFs && !winFs) await setWindowFs(true);
      else if (!anyFs && winFs) await setWindowFs(false);
    } catch { /* best-effort */ }
  }, 600);

  console.log('broadcast-helper armed on', ctx.pages().length, 'tab(s)');
  await new Promise((resolve) => b.on('disconnected', resolve));
  clearInterval(fsTimer);
}

// Reconnect across Chrome restarts so the broadcast stays ad-free.
while (true) {
  try { await session(); } catch { /* CDP down */ }
  await new Promise((r) => setTimeout(r, 3000));
}