Two bugs surfaced by the Phase 2 deletion-roundtrip test:
A) Folder delete in NC only fires one NodeDeletedEvent (for the folder
itself, no .jpg suffix). The handler bailed with "unsupported
extension" and photos inside the folder kept is_discarded=false in
mule until the 30-min discard_missing_photos_beat caught up.
Fix: when the deleted path has no supported extension, call new
`handle_directory_deletion()` which UPDATEs every Photo whose
filepath starts with `dirpath + '/'`. Single SQL statement,
idempotent (excludes already-discarded rows so re-deliveries don't
re-stamp discarded_at).
C) PUT-overwrite of a previously-discarded file fired NodeWrittenEvent
→ scan_folder, but scan_folder's "Photo exists by filepath, skip"
branch left is_discarded=true. File was back on disk; mule still
treated it as gone.
Fix: in that branch, if the existing row is discarded, flip
is_discarded=false + clear discarded_at + re-queue extract_metadata
so EXIF / nextcloud_fileid pick up any changes to the bytes.
Together these close the gap for "delete then put back" round-trips
via the NC webhook path. Trashbin-restore (bug B in the test report)
remains an NC-side gap — NC doesn't emit any event mule subscribes to
for restore-from-trash. That stays a TODO.
The watchfiles-based watcher works but duplicates Nextcloud's own
notion of "this file changed." NC has a webhook_listeners app that
can POST file events to an external URL. This adds the mule side of
that handshake.
- POST /api/v1/internal/nc-webhook authenticates a Bearer token
(NEXTCLOUD_WEBHOOK_SECRET, hmac.compare_digest) and dispatches the
same scan_folder / handle_file_deletion machinery the watcher used.
- Handles NodeCreated, NodeWritten, NodeDeleted, NodeRenamed.
Renamed is mapped to delete-old + scan-new-parent. Maps NC's
/admin/files/... path to the bind-mounted /nextcloud-users/admin/files/...
- backend/scripts/register_nc_webhooks.py is the idempotent
registrar: lists existing webhooks, deletes any pointing at the
target URL, then POSTs four fresh ones via OCS.
- Sets the env passthrough on backend + all workers in compose so
the same secret is available wherever the registrar might run.
watch_folders stays in place for now — webhooks become primary, the
watcher is a belt-and-suspenders fallback. Drop the watcher in a
follow-up once webhooks are proven reliable on this NC instance.
