Close#14292
## Issue
File ancestry endpoints return folder metadata without validating tenant
permissions, allowing any authenticated user to query arbitrary
`file_id` values across tenant boundaries.
## Affected Endpoints
- `GET /v1/file/parent_folder?file_id={file_id}`
- `GET /v1/file/all_parent_folder?file_id={file_id}`
- `GET /api/v1/files/{id}/ancestors`
## Root Cause
These endpoints **skip the permission check** that other file operations
(Delete, Download, Move) perform.
## Expected Permission Check
All file operations should follow this 3-step validation:
- Check file.tenant_id
- Check if user_id belongs to this tenant (via user_tenant join table)
- Check KB permission type (team permission)
**Code reference:** This is implemented in `checkFileTeamPermission()`
and used by Delete/Download/Move, but **missing** from
GetParentFolder/GetAllParentFolders.
## Reproduction
```bash
# User B (tenant: BBB) accessing User A's file (tenant: AAA)
curl -H "Authorization: Bearer USER_B_TOKEN" \
"http://localhost:9384/v1/file/parent_folder?file_id=AAA_FILE_123"
# Result: Returns User A's folder metadata ❌
# Expected: "No authorization." ✅
Fix
Pass userID from handler to service and call checkFileTeamPermission() — same as Download/Delete/Move handlers.
---------
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
### What problem does this PR solve?
Restrict file move operations: prevent moving a folder to itself or to
one of its own subfolders.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
Files /file API to RESTFul style.
### Type of change
- [x] Documentation Update
- [x] Refactoring
---------
Co-authored-by: writinwaters <cai.keith@gmail.com>
Co-authored-by: Liu An <asiro@qq.com>
