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* webdav: delete a folder with its contents * webdav: guard the recursive delete against stale and confined paths - propagate stat lookup errors instead of returning an error-bearing FileInfo: OpenFile and DELETE would otherwise take the recursive removeAll on a path whose type was never confirmed, wiping a directory on a transient filer error - refuse wrappedFs.Rename from or to the served root, matching the RemoveAll guard and webdav.Dir - normalize trailing slashes in removeAll so the delete names the entry itself, and refuse the root for every caller * webdav: keep file-only deletes shallow and refuse ancestor destinations - removeAll used by OpenFile and failed-upload cleanup now deletes non-recursively, so a folder swapped in after the stat check is not emptied by a pending file delete - MOVE and COPY whose destination contains the source are refused before the handler removes the destination, which would otherwise take the source down with it * webdav: also refuse a destination inside the source a MOVE or COPY into its own subtree recurses into the destination it just created; refuse it with the same guard instead of burning the recursion budget for a 500 * webdav: allow a shallow copy into the source subtree a COPY with Depth: 0 creates only the destination collection and never reads children, so it is safe inside the source; only deep copies and moves are refused there * webdav: refuse a copy/move whose source is unreadable * webdav: cover the missing-source refusal in the guard test * webdav: 500 on a source lookup failure, 404 only when absent --------- Co-authored-by: Chris Lu <chris.lu@gmail.com> Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>