code.pyret.org/src/web/close.html at e9c5429e4537cb1a47b8804f0338de389397d3ba · brownplt/code.pyret.org · GitHub

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<!doctype HTML>
<html>
<head>
<script>
// Method 1: Traditional postMessage (works when COOP allows window.opener)
if (window.opener) {
  try {
    window.opener.postMessage("done", document.location.origin);
  } catch (e) {
    console.warn("postMessage to opener failed:", e);
  }
}
else {
  console.warn("No window.opener", window.opener);
}

// Method 2: BroadcastChannel (works even when COOP severs window.opener)
// This is the fallback for environments like GoGuardian that inject COOP headers
if (typeof BroadcastChannel !== 'undefined') {
  try {
    let channel = new BroadcastChannel('pyret_auth');
    channel.postMessage({ type: 'auth_complete' });
    channel.close();
  } catch (e) {
    console.warn("BroadcastChannel failed:", e);
  }
}

// Method 3: localStorage fallback for very old browsers without BroadcastChannel
// The opener can detect this via the 'storage' event
try {
  localStorage.setItem('pyret_auth_complete', Date.now().toString());
} catch (e) {
  console.warn("localStorage fallback failed:", e);
}

window.close();
</script>
</head>
</html>