---
phase: 5
slug: 05-cloud-storage-backends
status: complete
nyquist_compliant: true
wave_0_complete: true
created: 2026-05-28
audited: 2026-05-30
---

# Phase 5 — Validation Strategy

> Per-phase validation contract for feedback sampling during execution.

---

## Test Infrastructure

| Property | Value |
|----------|-------|
| **Framework** | pytest + pytest-asyncio (already in requirements.txt) |
| **Config file** | `backend/pytest.ini` (already exists) |
| **Quick run command** | `cd backend && pytest tests/test_cloud.py -x -v` |
| **Full suite command** | `cd backend && pytest -v` |
| **Estimated runtime** | ~30 seconds (quick) / ~90 seconds (full) |

---

## Sampling Rate

- **After every task commit:** Run `cd backend && pytest tests/test_cloud.py -x -v`
- **After every plan wave:** Run `cd backend && pytest -v`
- **Before `/gsd:verify-work`:** Full suite must be green
- **Max feedback latency:** 90 seconds

---

## Per-Task Verification Map

| Task ID | Plan | Wave | Requirement | Threat Ref | Secure Behavior | Test Type | Automated Command | File Exists | Status |
|---------|------|------|-------------|------------|-----------------|-----------|-------------------|-------------|--------|
| 05-01-01 | 01 | 0 | CLOUD-01..07 | T-05-01 | Full test suite passes | unit + integration | `pytest tests/test_cloud.py -x -v` | ✅ | ✅ green |
| 05-01-02 | 01 | 0 | CLOUD-02 | T-05-02 | `credentials_enc` round-trip | unit | `pytest tests/test_cloud.py::test_credential_round_trip -x` | ✅ | ✅ green |
| 05-02-01 | 02 | 1 | CLOUD-01 | T-05-03 | HKDF encrypt/decrypt round-trip | unit | `pytest tests/test_cloud.py::test_credential_round_trip -x` | ✅ | ✅ green |
| 05-02-02 | 02 | 1 | CLOUD-02, SEC-08 | T-05-04 | `credentials_enc` not in API response | integration | `pytest tests/test_cloud.py::test_credentials_enc_not_exposed -x` | ✅ | ✅ green |
| 05-03-01 | 03 | 2 | CLOUD-01 | T-05-05 | OAuth callback validates state, rejects invalid state (400) | integration | `pytest tests/test_cloud.py::test_oauth_callback_invalid_state -x` | ✅ | ✅ green |
| 05-03-02 | 03 | 2 | CLOUD-01 | T-05-06 | SSRF: RFC-1918 and loopback blocked | unit | `pytest tests/test_cloud.py::test_ssrf_validation -x` | ✅ | ✅ green |
| 05-03-03 | 03 | 2 | CLOUD-01 | T-05-07 | WebDAV connection validated before save (D-08) | integration | `pytest tests/test_cloud.py::test_webdav_connect_validates -x` | ✅ | ✅ green |
| 05-04-01 | 04 | 3 | CLOUD-05 | T-05-08 | `invalid_grant` sets REQUIRES_REAUTH | integration | `pytest tests/test_cloud.py::test_invalid_grant_sets_requires_reauth -x` | ✅ | ✅ green |
| 05-04-02 | 04 | 3 | CLOUD-06 | T-05-09 | Disconnect permanently deletes `credentials_enc` from DB | integration | `pytest tests/test_cloud.py::test_disconnect_deletes_credentials -x` | ✅ | ✅ green |
| 05-05-01 | 05 | 4 | CLOUD-03 | T-05-10 | Cloud upload goes through FastAPI, not presigned URL | integration | `pytest tests/test_cloud.py::test_cloud_upload_no_presigned -x` | ✅ | ✅ green |
| 05-05-02 | 05 | 4 | CLOUD-07 | T-05-11 | StorageBackend factory returns correct type per `storage_backend` field | unit | `pytest tests/test_cloud.py::test_factory_returns_correct_backend -x` | ✅ | ✅ green |
| 05-06-01 | 06 | 5 | CLOUD-04 | T-05-12 | Admin cannot see `credentials_enc` | integration | `pytest tests/test_cloud.py::test_admin_cannot_see_credentials -x` | ✅ | ✅ green |
| 05-06-02 | 06 | 5 | CLOUD-01 | T-05-13 | Cross-user cloud connection access returns 404 | integration | `pytest tests/test_cloud.py::test_cross_user_idor -x` | ✅ | ✅ green |

*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*

---

## Wave 0 Requirements

- [x] `backend/tests/test_cloud.py` — all CLOUD-01..07 tests + SSRF + IDOR + admin-block (27 tests, all green)
- [x] `backend/tests/test_cloud_backends.py` — GoogleDriveBackend + OneDriveBackend structural tests (63 tests)
- [x] `backend/tests/test_cloud_utils.py` — utility/helper tests
- [x] `backend/tests/test_webdav_backend.py` — WebDAV + Nextcloud backend tests (27 tests)

*117 tests total across 4 cloud test files, all green.*

---

## Manual-Only Verifications

| Behavior | Requirement | Why Manual | Test Instructions |
|----------|-------------|------------|-------------------|
| OAuth consent UI for Google Drive | CLOUD-01 | Requires real GCP app credentials + browser | Connect Google Drive from SettingsView Cloud Storage tab; verify OAuth consent screen appears; verify redirect back with success toast |
| OAuth consent UI for OneDrive | CLOUD-01 | Requires real Azure app registration + browser | Connect OneDrive from SettingsView; verify Microsoft OAuth consent; verify redirect back with success toast |
| Sidebar cloud node appearance | CLOUD-03 | Browser UI | After connecting a provider, verify it appears as a top-level sidebar node; expand to see cloud folders |
| `REQUIRES_REAUTH` badge in UI | CLOUD-05 | Simulated token revocation + browser | Manually set `status='REQUIRES_REAUTH'` in DB; verify SettingsView shows yellow badge + Reconnect button |

---

## Validation Sign-Off

- [x] All tasks have `<automated>` verify or Wave 0 dependencies
- [x] Sampling continuity: no 3 consecutive tasks without automated verify
- [x] Wave 0 covers all MISSING references
- [x] No watch-mode flags
- [x] Feedback latency < 90s
- [x] `nyquist_compliant: true` set in frontmatter

**Approval:** 2026-05-30

---

## Validation Audit 2026-05-30

| Metric | Count |
|--------|-------|
| Gaps found | 0 |
| Resolved | 0 |
| Escalated | 0 |
| Tests passing | 117 |
| Test files | 4 (test_cloud.py, test_cloud_backends.py, test_cloud_utils.py, test_webdav_backend.py) |
| Validation map rows | 13 |
| All rows green | ✅ yes |

All 13 validation map requirements were fully covered at audit time. No gaps, no escalations. Phase 5 is Nyquist-compliant.