Public Share Links keeps loading for viewer: 5.0.0-dev.0

Infinite top-loading spinner on public share links, /s/undefined on download

---

Description

When sharing a folder via a public link in Nextcloud, visiting the link results in a continuous top loading spinner:

• The loading circle appears, stops briefly, then reappears indefinitely.

• In the top-right corner, the cross and three-dot menu are clickable.

• Clicking three-dot menu gives two options "Full Screen" and "Downlaod"

  • Clicking Download opens a new window with URL: https://cloud.pri.al/s/undefined
  • Clicking the Cross removes the spinner and allows normal browsing.

• Refreshing the page reproduces the same issue.

This behavior occurs regardless of whether the request is made via internal IP/port — it is not caused by NPM or reverse proxy settings.

---

Steps to Reproduce

1. Visit my public share link at https://cloud.pri.al/s/oXSsjP7KbkTMW9J
2. Observe the top loading spinner looping indefinitely.
3. Click the Download option in the top-right three-dot menu — observe the s/undefined URL.
4. Click the Cross in the top-right — the spinner disappears and content becomes accessible.

---

Browser console error

Could not open file / TypeError: can't access property "split", n is undefined
    openFileInfo Viewer.vue:720
    openFile Viewer.vue:669
    file Viewer.vue:459
    VueJS 11
        Eu
        run
        Jg
        Yn
        Eo
        promise callback*ys
        Yn
        Pi
        update
        notify
        set
    open Viewer.js:319
    openWith Viewer.js:353
    o main.ts:171
    v main.ts:400
    X main.ts:209
    E main.ts:428
    X main.ts:208
    z main.ts:62
    <anonymous> main.ts:477
Viewer.vue:680:1
    openFile Viewer.vue:680
    file Viewer.vue:459
    VueJS 11
    open Viewer.js:319
    openWith Viewer.js:353
    o main.ts:171
    v main.ts:400
    X main.ts:209
    E main.ts:428
    X main.ts:208
    z main.ts:62
    <anonymous> main.ts:477

---

Environment

• Nextcloud version: 32.0.3 (docker: linuxserver/nextcloud:latest)
• Apps causing this issue is viewer: 5.0.0-dev.0
• rm -rf viewer from /app/www/public/apps/directory fixes the issue but I lost file preview functionality.

---

Additional Context / Notes

• The bug appears only on public shared folders; internal accounts and authenticated users are unaffected.
• Previous instances of DEV app viewer 5.0.0-dev caused the spinner to behave similarly.
• Removing incompatible DEV apps temporarily resolved the spinner, but restoring the viewer folder from a clean container brings the preview functionality back, reintroducing the spinner.
• Likely cause: viewer code attempts to access undefined file IDs in public shares when certain optional apps are missing or incompatible.

---

Suggested Investigation

• Examine viewer public share logic in Nextcloud 32, particularly how it handles fileId when no previewing app is installed or when optional apps like files_downloadlimit are removed.
• Prevent undefined.split() errors in Viewer.vue for public links.

---

This bug is reproducible consistently on fresh docker containers with only stable apps installed.

Thanks

Start by reproducing the public shared-folder link and reading Viewer.vue around openFileInfo (line 720) and openFile (lines 669-680), using the reported undefined.split() stack trace. Trace how the file ID reaches the public-share viewer and verify the spinner stops, browsing remains usable, and Download no longer opens an s/undefined URL.