@uppy/companion: support oCIS public share links in the WebDAV provider

[dj4oC]

Problem

Companion's WebDAV provider resolves Nextcloud/ownCloud/oCIS public share links (https://host/s/<token>) to a single hard-coded WebDAV endpoint, /public.php/webdav/:

https://github.com/transloadit/uppy/blob/main/packages/@uppy/companion/src/server/provider/webdav/index.ts

That path works for Nextcloud and ownCloud 10, but oCIS (ownCloud Infinite Scale) serves public shares at /dav/public-files/<token>. Hitting /public.php/webdav/ on oCIS returns an HTML page instead of a 207 Multi-Status, so the import fails with:

Invalid response: No root multistatus found

Fixes #6007. As discussed in #6117, there is no standard WebDAV (or reliably-shaped capabilities) way to discover the correct public-share path across servers.

Fix

When a public share link is detected, probe the known public-share WebDAV endpoints and use the first that actually responds as WebDAV (a cheap depth-0 PROPFIND); hitting the wrong endpoint throws No root multistatus found, so we move on to the next candidate:

• /public.php/webdav/ — Nextcloud, ownCloud 10
• /dav/public-files/<token> — oCIS

The resolved endpoint is cached on the session (publicLinkUrl) so subsequent list/download requests don't re-probe. Behavior for Nextcloud / ownCloud 10 is unchanged (their endpoint is the first candidate and matches immediately); oCIS now works via the fallback. If no candidate answers as WebDAV, it falls back to the previous default endpoint so the original, meaningful error still surfaces.

This is the "probe the oCIS endpoint alongside the current path" approach proposed in #6117, and it generalizes cleanly if more server-specific endpoints need to be added later.

Testing

Added packages/@uppy/companion/test/webdav.test.ts covering the resolver:

• Nextcloud/ownCloud → /public.php/webdav/ (oCIS endpoint never probed)
• oCIS → falls back to /dav/public-files/<token> (ownCloud path probed first)
• cached publicLinkUrl is reused without re-probing
• no candidate responds → falls back to the default endpoint
• /index.php is stripped from the base URL
• a tokenless /s/ URL throws

yarn workspace @uppy/companion test passes (124 tests), yarn workspace @uppy/companion typecheck is clean, and Biome is clean on the changed files. A changeset is included (@uppy/companion patch).

[changeset-bot]

🦋 Changeset detected

Latest commit: 6011ef1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@uppy/companion	Patch

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[dj4oC]

@qxprakash @Murderlon @mifi would you mind to review this one? Thank you very much