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fix(ui): don't strand the Mini App on a cancelled GCG share

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On iOS WKWebView (the Telegram Mini App), cancelling the Web Share sheet fell
through to the Blob <a download> fallback. iOS ignores the download attribute,
so clicking the anchor navigated the webview to the blob: URL — replacing the
SPA with the raw GCG file, with no way back (force-quit only).

The share path no longer falls back to a download: Web Share is available on
that platform, so a cancelled or failed share is a no-op and the user can
retry. The Blob download stays the desktop-only path (no Web Share).
This commit is contained in:
Ilia Denisov
2026-06-17 14:01:02 +02:00
parent 2c24d54047
commit e850ecd83b
2 changed files with 49 additions and 4 deletions
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ui/src/lib/share.ts
+7 -2
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@@ -25,12 +25,17 @@ export async function shareOrDownloadGcg(gcg: GcgExport): Promise<void> {
const file = new File([gcg.content], gcg.filename, { type: 'application/x-gcg' });
const nav = typeof navigator !== 'undefined' ? navigator : undefined;
if (pickGcgDelivery(nav, file) === 'share' && nav) {
// Web Share is available (mobile, including the iOS Telegram Mini App): use it and stop here
// whatever the outcome. Do NOT fall back to the Blob download — on iOS WKWebView an
// <a download> navigates the webview to the blob: URL, replacing the SPA with the raw file
// and stranding the app, so a cancelled or failed share must simply do nothing (the user can
// retry). The download path is only for desktop browsers without Web Share.
try {
await nav.share({ files: [file], title: gcg.filename });
return;
} catch {
// The user cancelled or sharing failed — fall back to a download.
/* cancelled or failed — intentionally a no-op (see above) */
}
return;
}
downloadFile(gcg.content, gcg.filename);
}