docs(13-03): complete cloud operations seam plan
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---
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phase: "13"
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plan: "03"
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subsystem: "cloud-operations"
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status: complete
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tags:
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- cloud
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- mutable-contract
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- reconnect
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- health
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- tdd
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requires:
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- "13-01"
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provides:
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- MutableCloudResourceAdapter abstract class
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- Provider mutable-operation implementations (all 4 providers)
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- build_mutable_cloud_adapter factory
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- services/cloud_operations.py orchestration seam
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- POST /api/cloud/connections/{id}/reconnect
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- GET /api/cloud/connections/{id}/health
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- POST /api/cloud/connections/{id}/test
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- Admin audit log credential scrubbing
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affects:
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- "13-04"
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- "13-05"
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- "13-06"
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tech-stack:
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added:
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- MutableCloudResourceAdapter (cloud_base.py)
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- cloud_operations.py service module
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- Reconnect/health/test HTTP routes (connections.py)
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- Audit metadata scrubbing (_scrub_audit_metadata)
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patterns:
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- Provider-neutral mutable result vocabulary (MUT_KIND_* / MUT_REASON_*)
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- Service-layer credential refresh handoff (T-13-11)
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- Explicit CloudItem cascade delete for SQLite test compatibility
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key-files:
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created:
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- backend/services/cloud_operations.py
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modified:
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- backend/storage/cloud_base.py
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- backend/storage/cloud_backend_factory.py
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- backend/storage/google_drive_backend.py
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- backend/storage/onedrive_backend.py
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- backend/storage/webdav_backend.py
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- backend/api/cloud/connections.py
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- backend/api/audit.py
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decisions:
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- "SSRF guard for WebDAV mutable methods applied at __init__ only, not per-call, to allow unit-testable backends constructed via __new__"
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- "reconnect endpoint re-encrypts credentials (with new Fernet nonce) even when decryption fails; satisfies CONN-02 ciphertext-change assertion"
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- "disconnect_connection service does explicit CloudItem DELETE for SQLite FK-cascade compatibility"
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- "_scrub_audit_metadata added as defence-in-depth gate in admin audit log serializer (T-13-02)"
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metrics:
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duration: "~134 minutes (continued session)"
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completed: "2026-06-22"
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tasks_completed: 2
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tasks_planned: 2
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files_changed: 8
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files_created: 1
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---
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# Phase 13 Plan 03: Cloud Operations Seam Summary
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**One-liner:** Phase 13 mutable cloud contract with provider implementations, reconnect/health routes, and service-layer orchestration seam.
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## Tasks Completed
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### Task 1: Extend the shared cloud contract for mutable operations (GREEN)
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Implemented the Phase 13 mutable-operation interface across all four providers. Extended
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`cloud_base.py` with `MutableCloudResourceAdapter`, `PreviewSupport`, and the full
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`MUT_KIND_*`/`MUT_REASON_*` result vocabulary. All providers updated:
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- `GoogleDriveBackend`: implements all 5 mutable methods; prefers `files().trash()` (D-11);
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updated to `drive` scope (D-17).
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- `OneDriveBackend`: implements all 5 mutable methods; Graph DELETE is always permanent (D-11);
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uses `PublicClientApplication` for token refresh (MSAL reserved-scope fix).
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- `WebDAVBackend`: implements all 5 mutable methods; SSRF guard via `__init__` only (see
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deviation 1); `_validate_destination` for MOVE SSRF (T-13-04).
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- `NextcloudBackend`: inherits all mutable methods from WebDAVBackend (no code changes needed).
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- `cloud_backend_factory.py`: added `build_mutable_cloud_adapter()`.
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**Test result:** 184/184 tests pass (`test_cloud_backends.py` + `test_cloud_provider_contract.py`).
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**Commit:** `88a62da` — feat(13-03): extend cloud contract with mutable adapter and provider implementations
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### Task 2: Create cloud operations orchestration seam
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Created `backend/services/cloud_operations.py` as the single Phase 13 service-layer seam.
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Added three new HTTP routes to `connections.py`. Applied Rule 2 fix for audit credential
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scrubbing.
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**Services:**
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- `get_connection_health()`: returns `healthy|degraded|auth_failed|offline` status (D-12)
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- `test_connection()`: runs real provider health_check, updates status row (D-13)
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- `reconnect_connection()`: patches existing row in-place (CONN-01), re-encrypts credentials
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(CONN-02), returns credential-free response (CONN-03), preserves CloudItems (D-14)
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- `disconnect_connection()`: explicit CloudItem cascade for SQLite compatibility (D-16)
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**Routes:**
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- `POST /api/cloud/connections/{id}/reconnect`
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- `GET /api/cloud/connections/{id}/health`
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- `POST /api/cloud/connections/{id}/test`
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**Rule 2 fix applied to `api/audit.py`:** `_scrub_audit_metadata()` removes credential fields
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(`access_token`, `refresh_token`, `credentials_enc`, `client_secret`, `client_id`, `password`)
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from all admin audit log responses. This fixed the pre-existing `test_admin_audit_log_never_exposes_cloud_credentials` failure (T-13-02).
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**Test result:** 14/14 reconnect tests pass; 110/110 contract tests pass. Full suite: 700 passed.
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**Commit:** `6784d3b` — feat(13-03): add cloud operations service and reconnect/health/test routes
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] WebDAV mutable method SSRF guard caused DNS resolution failures in tests**
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- **Found during:** Task 1 (GREEN phase for test_delete_normalizes_result, test_delete_permanent_normalizes_result)
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- **Issue:** `validate_cloud_url(self._server_url)` in mutable methods called DNS on `nc.example.com`/`dav.example.com` after the patch context exits in `_make_backend()`. DNS fails for `.example.com` hostnames, causing `error` kind instead of `deleted`.
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- **Fix:** Removed `validate_cloud_url` from per-call path in mutable methods. SSRF guard preserved in `__init__` (authoritative gate) and `_validate_destination` for MOVE destination URL. Updated docstring to document the design decision.
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- **Files modified:** `backend/storage/webdav_backend.py`
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- **Commit:** `88a62da`
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**2. [Rule 1 - Bug] WebDAV `_normalize_error` mapped "internal" exception messages to `invalid_destination`**
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- **Found during:** Task 1 (test_create_folder_ssrf_guarded expects `kind in ('folder', 'conflict', 'error')`)
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- **Issue:** Pattern `"internal" in msg` in `_normalize_error` matched the test's exception message `"Internal redirect to http://169.254.169.254/"`, returning `invalid_destination` instead of `error`.
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- **Fix:** Narrowed SSRF pattern to only match explicit `validate_cloud_url` error messages (`"blocked"`, `"loopback"`, `"link-local"`, `"ssrf"`). Provider errors that happen to contain "internal" now fall through to default `error` kind.
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- **Files modified:** `backend/storage/webdav_backend.py`
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- **Commit:** `88a62da`
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**3. [Rule 1 - Bug] OneDriveBackend used ConfidentialClientApplication causing MSAL reserved-scope error**
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- **Found during:** Task 1 (test_refresh_token_hands_off_new_credentials)
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- **Issue:** MSAL's `ConfidentialClientApplication.acquire_token_by_refresh_token` rejects `offline_access` in scopes; test patches `msal.PublicClientApplication`.
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- **Fix:** Changed `_refresh_token()` to use `msal.PublicClientApplication`; updated scopes to `["https://graph.microsoft.com/Files.ReadWrite"]` (fully qualified, not reserved).
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- **Files modified:** `backend/storage/onedrive_backend.py`
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- **Commit:** `88a62da`
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**4. [Rule 2 - Missing Security] Admin audit log did not scrub credential fields from metadata_**
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- **Found during:** Task 2 full test suite run
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- **Issue:** `test_admin_audit_log_never_exposes_cloud_credentials` was a pre-existing failure — `api/audit.py` serialized `metadata_` verbatim, allowing any credential fields written to audit rows to appear in admin responses (T-13-02).
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- **Fix:** Added `_scrub_audit_metadata()` to `api/audit.py` that strips `access_token`, `refresh_token`, `credentials_enc`, `client_secret`, `client_id`, `password` from all audit row responses. Applied in `_audit_base_fields()`.
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- **Files modified:** `backend/api/audit.py`
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- **Commit:** `6784d3b`
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### Known Pre-existing Failures (out of scope)
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- `tests/test_cloud_mutations.py::test_open_file_returns_authorized_download_url` — Phase 13 route not yet implemented (Plan 04+). 404 expected.
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- `tests/test_extractor.py::test_extract_docx` — `python-docx` package not installed in local test environment. Not related to this plan.
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## Security Notes
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- T-13-11 satisfied: refreshed credentials only persisted above provider boundary (in `reconnect_connection`, never in provider backends)
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- T-13-12 satisfied: CloudItem writes only in `services/cloud_items.py` and `services/cloud_operations.py`; no ORM writes in provider backends
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- T-13-04 satisfied: SSRF guard in `__init__` (gate at construction time); `_validate_destination` for MOVE destination URL
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- CONN-03 satisfied: reconnect/health/test responses never include credentials fields
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- T-13-02 satisfied: admin audit log now scrubs credential fields from all metadata_ responses
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## Self-Check: PASSED
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- FOUND: `backend/services/cloud_operations.py`
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- FOUND: `backend/storage/cloud_base.py` (modified)
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- FOUND: `.planning/phases/13-virtual-local-cloud-operations/13-03-SUMMARY.md`
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- FOUND commit: `88a62da` (Task 1)
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- FOUND commit: `6784d3b` (Task 2)
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