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web: open the Windows app from /auth (cascade:// handoff) #15

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Merged
JacobStephens2 merged 1 commit into from
Jun 7, 2026
Merged

web: open the Windows app from /auth (cascade:// handoff) #15

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34 changes: 32 additions & 2 deletions apps/web/public/auth/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -71,17 +71,29 @@
button:active { transform: translateY(1px); }
.hint { font-size: 0.85rem; margin-top: 18px; }
.err { color: #e2786e; }
.open {
display: inline-block;
margin: 0 0 18px;
padding: 12px 22px;
border-radius: 10px;
background: var(--accent);
color: #042029;
font-weight: 600;
text-decoration: none;
}
.open[hidden] { display: none; }
</style>
</head>
<body>
<main class="card">
<h1>Sign in to Cascade</h1>
<div id="content">
<p>
<p id="lead">
If the Cascade app is installed it should have opened automatically.
Otherwise, open Cascade, then paste this sign-in code into the
<em>“paste the sign-in link”</em> box:
</p>
<a id="open" class="open" href="#" hidden>Open Cascade</a>
<div class="token">
<code id="token">…</code>
<button id="copy" type="button">Copy</button>
Expand All @@ -92,11 +104,29 @@ <h1>Sign in to Cascade</h1>
<script>
// The whole sign-in link works too — the app extracts the token itself —
// but showing just the token keeps the copy/paste short.
const token = new URLSearchParams(location.search).get("token");
const params = new URLSearchParams(location.search);
const token = params.get("token");
const tokenEl = document.getElementById("token");
const copyBtn = document.getElementById("copy");
if (token) {
tokenEl.textContent = token;

// Windows desktop handoff: links minted for the Windows app carry
// &app=windows. The unpackaged app has no Universal Link (unlike
// Apple), so launch it explicitly via its cascade:// scheme — auto-
// attempt, plus a button as the reliable fallback if the browser
// blocks programmatic protocol navigation. The copy-the-code path
// below still works if the app isn't installed.
if (params.get("app") === "windows") {
const deepLink = "cascade://auth?token=" + encodeURIComponent(token);
document.getElementById("lead").textContent =
"Opening the Cascade app to finish signing in…";
const openBtn = document.getElementById("open");
openBtn.href = deepLink;
openBtn.hidden = false;
location.href = deepLink;
}

copyBtn.addEventListener("click", async () => {
try {
await navigator.clipboard.writeText(token);
Expand Down