docs(05-04): complete WebDAVBackend + NextcloudBackend plan — SUMMARY and STATE
- 05-04-SUMMARY.md: 2 tasks (31 tests, 4 files), 8 min, 1 auto-fixed deviation (factory dispatch) - STATE.md: plan advanced to 4/8, session log updated, 3 new key decisions recorded
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| 2 | Users & Authentication | ✓ Complete (5/5 plans) |
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| 3 | Document Migration & Multi-User Isolation | ✓ Complete (5/5 plans, UAT passed, security gate passed) |
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| 4 | Folders, Sharing, Quotas & Document UX | ✓ Complete (9/9 plans, UAT 14/15 passed, 1 bug fixed) |
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| 5 | Cloud Storage Backends | In Progress (3/8 plans complete) |
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| 5 | Cloud Storage Backends | In Progress (4/8 plans complete) |
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## Current Position
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**Phase:** 05-cloud-storage-backends — In Progress
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**Plan:** 3/8
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**Plan:** 4/8
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**Progress:** [████████░░] 84%
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## Performance Metrics
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| cache_discovery=False on Drive build() | Prevents /tmp discovery cache writes — directory traversal vector (T-05-03-05) |
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| createUploadSession for all OneDrive uploads | No 4 MB size gate; resumable sessions handle small and large files through same code path (Pitfall 6) |
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| MSAL invalid_grant via result.get('error') | MSAL returns dict (never raises); field-level check is correct — Assumption A3 confirmed |
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| WebDAVBackend SSRF double guard pattern | validate_cloud_url in __init__ (construct-time) AND before every asyncio.to_thread() call — mirrors D-17 requirement for DNS-rebinding mitigation |
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| nextcloud/webdav dispatch to distinct classes | NextcloudBackend for 'nextcloud' provider (has list_folder); WebDAVBackend for 'webdav' — identical constructor signatures |
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| webdavclient3 upload_to/download_from confirmed | A1 assumption in RESEARCH.md was correct; verified via runtime dir(Client) inspection before use |
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### Open Questions
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@@ -174,6 +177,7 @@ _Updated at each phase transition._
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| Last session | 2026-05-28 — Plan 05-01 executed: Wave 0 Nyquist scaffold — 19 xfail stubs in test_cloud.py, 4 cloud fixtures in conftest.py, 6 package pins, 8 config settings; 172 passed / 43 xfailed |
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| Last session | 2026-05-28 — Plan 05-02 executed: cloud_utils.py (SSRF+HKDF), cloud_cache.py (TTLCache), storage factory extended; 199 passed / 43 xfailed / 1 pre-existing failure |
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| Last session | 2026-05-28 — Plan 05-03 executed: GoogleDriveBackend (Drive v3, cache_discovery=False, asyncio.to_thread) + OneDriveBackend (MSAL, resumable upload, CHUNK_SIZE=10MB); 262 passed / 43 xfailed / 1 pre-existing failure |
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| Next action | Execute Plan 05-04: WebDAVBackend + NextcloudBackend |
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| Last session | 2026-05-28 — Plan 05-04 executed: WebDAVBackend + NextcloudBackend (SSRF double-guard, asyncio.to_thread, list_folder); 262 passed / 43 xfailed / 1 pre-existing failure |
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| Next action | Execute Plan 05-05: Cloud API Endpoints |
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| Pending decisions | None |
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| Resume file | `.planning/phases/05-cloud-storage-backends/05-04-PLAN.md` |
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| Resume file | `.planning/phases/05-cloud-storage-backends/05-05-PLAN.md` |
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---
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phase: 05-cloud-storage-backends
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plan: 04
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subsystem: api
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tags: [webdav, nextcloud, webdavclient3, ssrf, asyncio, storage-backend, cloud-storage]
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# Dependency graph
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requires:
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- phase: 05-cloud-storage-backends
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plan: 02
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provides: "cloud_utils.py: validate_cloud_url (SSRF guard), encrypt/decrypt_credentials (HKDF+Fernet), storage factory"
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provides:
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- "backend/storage/webdav_backend.py: WebDAVBackend — generic WebDAV StorageBackend (all 7 methods)"
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- "backend/storage/nextcloud_backend.py: NextcloudBackend — Nextcloud-specific extension with list_folder"
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- "backend/storage/__init__.py: nextcloud dispatch correctly routes to NextcloudBackend"
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affects: [05-05, 05-06, 05-07, 05-08]
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# Tech tracking
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tech-stack:
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added:
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- webdavclient3 3.14.7 — synchronous WebDAV client; all calls wrapped in asyncio.to_thread()
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- lxml 6.1.1 — dependency of webdavclient3 (auto-installed)
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patterns:
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- "SSRF double guard: validate_cloud_url() in __init__ (construct-time) AND before every asyncio.to_thread() call (request-time)"
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- "asyncio.to_thread() for all sync webdavclient3 calls — mirrors MinIOBackend pattern"
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- "urllib.parse.quote() on path segments for WebDAV/Nextcloud compatibility (RESEARCH.md Pitfall 2)"
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- "WebDAVBackend subclassing: NextcloudBackend inherits all 7 ABC methods, only overrides health_check"
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- "list_folder returns [{id, name, is_dir, size}] — consumed by cloud folder listing API endpoint"
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key-files:
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created:
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- backend/storage/webdav_backend.py
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- backend/storage/nextcloud_backend.py
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- backend/tests/test_webdav_backend.py
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modified:
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- backend/storage/__init__.py
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key-decisions:
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- "validate_cloud_url called in __init__ AND before every asyncio.to_thread() — defence-in-depth against DNS rebinding (D-17 / T-05-04-02)"
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- "webdavclient3 upload_to/download_from method names confirmed by runtime inspection — match RESEARCH.md ASSUMPTION A1"
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- "nextcloud and webdav providers dispatch to different classes: NextcloudBackend vs WebDAVBackend"
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- "list_folder calls validate_cloud_url before each client.info() call in the item loop (every outbound request)"
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patterns-established:
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- "WebDAVBackend._make_path: 'docuvault/{encoded_user_id}/{encoded_doc_id}{ext}' — object_key = WebDAV path"
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- "presigned methods raise NotImplementedError on all cloud backends (D-14)"
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- "delete_object catches all exceptions silently — no-op semantics per StorageBackend ABC contract"
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- "NextcloudBackend.health_check uses client.check('') vs WebDAVBackend.health_check client.check('/')"
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requirements-completed:
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- CLOUD-01
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- CLOUD-07
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# Metrics
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duration: 8min
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completed: 2026-05-28
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---
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# Phase 5 Plan 04: WebDAVBackend and NextcloudBackend Summary
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**Generic WebDAV and Nextcloud StorageBackend implementations with SSRF double-guard (construct-time + per-request), asyncio.to_thread() wrapping for all sync webdavclient3 calls, and NextcloudBackend list_folder for lazy-load folder tree**
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## Performance
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- **Duration:** 8 min
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- **Started:** 2026-05-28T19:05:47Z
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- **Completed:** 2026-05-28T19:13:35Z
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- **Tasks:** 2 (+ 1 RED phase commit)
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- **Files modified:** 4
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## Accomplishments
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- Created `webdav_backend.py` with `WebDAVBackend` implementing all 7 `StorageBackend` abstract methods; validate_cloud_url() called in `__init__` (SSRF at construct time) and before every `asyncio.to_thread()` call (D-17 defence-in-depth / T-05-04-01, T-05-04-02)
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- Created `nextcloud_backend.py` with `NextcloudBackend(WebDAVBackend)` inheriting all 7 methods; added `list_folder()` async method returning `[{id, name, is_dir, size}]` dicts for the lazy-load cloud folder tree API; overrides `health_check` to use `client.check("")` for Nextcloud root
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- Confirmed webdavclient3 actual method names by runtime inspection (`upload_to`, `download_from` — RESEARCH.md ASSUMPTION A1 was correct)
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- Created 31 TDD tests covering: subclassing invariants, all 7 methods async, SSRF guard for multiple private IP ranges, NotImplementedError for presigned methods, `_make_path` path construction and percent-encoding, NextcloudBackend subclass, `list_folder` presence, inherited SSRF guard
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- Fixed storage factory `__init__.py` to dispatch `nextcloud` provider to `NextcloudBackend` and `webdav` to `WebDAVBackend` (both with identical constructor signatures)
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## Task Commits
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1. **RED phase tests** — `c406ab1` (test)
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2. **Task 1: WebDAVBackend** — `311dfa1` (feat)
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3. **Task 2: NextcloudBackend** — `1b9573f` (feat)
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4. **Storage factory fix** — `a9ea33d` (feat)
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## Files Created/Modified
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- `/Users/nik/Documents/Progamming/document_scanner/backend/storage/webdav_backend.py` — WebDAVBackend: all 7 async methods, SSRF guard, asyncio.to_thread() wrapping, _make_path with URL encoding
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- `/Users/nik/Documents/Progamming/document_scanner/backend/storage/nextcloud_backend.py` — NextcloudBackend: inherits WebDAVBackend, adds list_folder(), overrides health_check()
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- `/Users/nik/Documents/Progamming/document_scanner/backend/tests/test_webdav_backend.py` — 31 tests (TDD: RED → GREEN)
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- `/Users/nik/Documents/Progamming/document_scanner/backend/storage/__init__.py` — Fixed nextcloud/webdav provider dispatch in get_storage_backend_for_document()
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## Decisions Made
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- `validate_cloud_url()` is called inside `list_folder()` before `client.list()` AND before each `client.info()` in the item loop — every outbound HTTP request is guarded, not just the first in the loop.
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- webdavclient3 method names `upload_to(buf, remote_path)` and `download_from(buf, remote_path)` were confirmed by runtime `dir(Client)` inspection before use. RESEARCH.md ASSUMPTION A1 was accurate.
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- `nextcloud` and `webdav` now dispatch to distinct classes so `list_folder` is available on Nextcloud connections but not on generic WebDAV connections (which don't have a standardised folder listing path convention).
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- `client.mkdir(parent_dir, recursive=True)` called in `put_object` before upload — idempotent; webdavclient3 mkdir is a no-op if directory already exists.
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 2 - Missing Critical] Storage factory dispatching nextcloud to WebDAVBackend instead of NextcloudBackend**
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- **Found during:** Post-Task 2 review of storage/__init__.py
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- **Issue:** The Plan 02 factory combined `nextcloud` and `webdav` into a single dispatch arm both returning `WebDAVBackend`. This meant Nextcloud connections would not have `list_folder`, which is the key capability that distinguishes `NextcloudBackend` from `WebDAVBackend` and is required for the cloud folder tree API.
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- **Fix:** Split the dispatch: `nextcloud` → `NextcloudBackend`, `webdav` → `WebDAVBackend`; both use identical constructor signatures so the fix is a one-line change per arm.
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- **Files modified:** `backend/storage/__init__.py`
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- **Verification:** Full test suite passes (262 passed); factory module imports correctly.
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- **Committed in:** `a9ea33d`
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---
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**Total deviations:** 1 auto-fixed (Rule 2 — missing critical dispatch differentiation)
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**Impact on plan:** No scope creep. The fix restores intended behaviour already implied by the plan's decision to use two distinct classes.
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## Issues Encountered
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webdavclient3 was not installed locally — installed via `pip3 install webdavclient3` (as expected for a new dependency added in Plan 05-01 requirements.txt). This is consistent with the Pattern established in Plan 05-02 SUMMARY.
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## Known Stubs
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None. Both backends implement all 7 StorageBackend methods without stubs or placeholder returns. `presigned_get_url` and `generate_presigned_put_url` raise `NotImplementedError` by design (D-14).
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## Threat Surface Scan
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No new network endpoints introduced. Both backends are internal SDK wrappers:
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- All outbound WebDAV HTTP calls flow through webdavclient3 SDK, not new FastAPI routes
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- SSRF guard (`validate_cloud_url`) is called at construct-time and before every outbound call — T-05-04-01 and T-05-04-02 mitigated
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- No new trust boundaries created
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No threat flags raised.
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## Next Phase Readiness
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- Plans 05-03 (Google Drive), 05-05 (OneDrive) can import from `storage.webdav_backend` and `storage.nextcloud_backend` immediately
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- `get_storage_backend_for_document()` now correctly dispatches all 4 providers (minio, google_drive stub, onedrive stub, nextcloud, webdav)
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- The 31 new tests are green; the 43 xfail stubs in `test_cloud.py` remain xfail (correctly — they test API endpoints not yet built)
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- Full suite: 262 passed / 43 xfailed / 1 pre-existing failure (`test_extract_docx` — python-docx not installed locally)
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## Self-Check: PASSED
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Files verified present:
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- `backend/storage/webdav_backend.py`: FOUND (class WebDAVBackend, all 7 async methods)
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- `backend/storage/nextcloud_backend.py`: FOUND (class NextcloudBackend, list_folder)
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- `backend/tests/test_webdav_backend.py`: FOUND (31 tests, all passing)
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- `backend/storage/__init__.py`: FOUND (updated nextcloud/webdav dispatch)
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Commits verified:
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- c406ab1: test(05-04) — RED tests — FOUND
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- 311dfa1: feat(05-04) — WebDAVBackend — FOUND
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- 1b9573f: feat(05-04) — NextcloudBackend — FOUND
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- a9ea33d: feat(05-04) — factory fix — FOUND
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---
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*Phase: 05-cloud-storage-backends*
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*Completed: 2026-05-28*
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