- Add backend/ai/utils.py — parse_classification, parse_suggestions, strip_code_fences
shared by all AI providers; removes duplicated private functions from
anthropic_provider.py and openai_provider.py
- Add backend/deps/utils.py — get_client_ip, parse_uuid request-parsing helpers;
removes local _ip() variants from admin.py, auth.py, shares.py, folders.py
- Add backend/storage/exceptions.py — canonical CloudConnectionError definition;
all routers and backends import from here instead of redefining
- Move validate_password_strength to backend/services/auth.py; removes duplicated
_validate_password_strength from admin.py and auth.py
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- CloudConnectionError(reason=) defined in this module — token_expired | invalid_grant
- All 7 StorageBackend methods implemented as async coroutines
- Every sync googleapiclient call wrapped in asyncio.to_thread() (Pitfall 7)
- cache_discovery=False on build() prevents /tmp directory traversal (T-05-03-05)
- presigned_get_url and generate_presigned_put_url raise NotImplementedError (D-14)
- HttpError 401 raises CloudConnectionError(reason='token_expired')
- HttpError 400 with 'invalid_grant' raises CloudConnectionError(reason='invalid_grant')
- HttpError 404 on delete_object is silently swallowed (no-op per contract)
- Backend is stateless — no DB writes (B2 design, D-05/D-06)
curo1305