Error when exporting Audit Log

[denislsuk]

When I try to export the Audit Log I get the following error:

I am on the latest version: 3.1.0 and using the Edge browser in case that might be relevant.

[karenrebecag]

This is a bug in the wiki frontend, not in your setup. The export sends the file as a Blob whose type is application/x-ndjson; charset=utf-8, and Chromium-based browsers (Edge included) reject any save-picker type that carries parameters.

Why it happens

• AdminAudit.vue builds the download with API_CLIENT.get('audit/export').blob(). The blob keeps the response's Content-Type verbatim, including ; charset=utf-8 (backend/api/auditLog.ts sets that header).
• It then calls fileSave(blob, …) from browser-fs-access. In the modern path (showSaveFilePicker available), the library uses blob.type as the key of types[].accept: accept[o] = extensions.
• The File System Access spec says a save-picker accept MIME must parse with empty parameters. A key with ;charset= throws a TypeError before any dialog opens, which is the Invalid type: application/x-ndjson; charset=utf-8 in the screenshot.

The repo already knows this. frontend/src/helpers/pageVersions.js (L68) says: "A bare MIME type, with no ;charset= on it: the save picker uses this as an accept key and rejects a type carrying parameters outright." That helper wraps the content in a new Blob without the parameter. AdminAudit.vue does not, so the audit export still hits the bug.

Workaround now

Use a browser without showSaveFilePicker (Firefox or Safari, which as far as I know don't ship the File System Access save picker). browser-fs-access then takes its <a download> fallback and the export downloads. I did not run this in a browser, so treat it as the expected path, not a tested one.

Fix (one line, same pattern as pageVersions.js)

In frontend/src/pages/AdminAudit.vue, around L529:

await fileSave(new Blob([blob], { type: 'application/x-ndjson' }), {
  fileName: `audit-log-${stamp}.jsonl`,
  extensions: ['.jsonl']
})

The same problem appears in frontend/src/components/GroupEditOverlay.vue L1568, which passes type: 'application/json;charset=UTF-8' to fileSave. It will probably fail the same way in Chromium, though I have not run that path.

What I checked and didn't

• Verified in code: the call chain above, the blob.type → accept mapping in browser-fs-access 0.38.0 (the frontend's pinned version), and the spec rule.
• Not verified: running the export in Edge or Chrome, and the Firefox/Safari fallback behavior.

[NGPixel]

Fixed via 4c8f28d. Will land in next release.