---
paths:
  - "image/**"
---

# FastAPI image (`image/`)

Standalone FastAPI app (Python ≥3.11; ships on `python:3.12-slim`; UI on port 9999; vanilla HTML/CSS/JS, no framework). Python has no configured linter/formatter — match the style of the file you're editing.

## Local dev (no StartOS)

```bash
cd image
python3 -m venv .venv && source .venv/bin/activate   # one-time
pip install -e .
export SPARK1_HOST=<ip> SPARK1_USER=<user> SPARK2_HOST=<ip> SPARK2_USER=<user> SSH_KEY_PATH=<private-key>
# Required outside the container — these default to paths under /data, which only exists in the image
# (missing REDACTION_MAP_DB crashes startup; missing CONNECTIVITY_LOG 500s /api/status):
export REDACTION_MAP_DB=/tmp/redaction_maps.db CONNECTIVITY_LOG=/tmp/connectivity.json
uvicorn app.server:app --host 0.0.0.0 --port 9999 --reload
```

Other env vars: `BIND_PORT`, `MODELS_YAML`, `SSH_DIR`, `SSH_KNOWN_HOSTS`, `MODELS_OVERRIDES`, `SERVICES_OVERRIDES`.

## Tests

No pytest harness — each suite is a standalone script run with the `image/.venv` interpreter (system python3 has no deps). See the redaction and audio rules for the suites themselves.

## Conventions

- Pydantic request models go at **module scope**, never inside a `build_router()` body (FastAPI silently 422s otherwise).
- New external-facing endpoints get documented in `docs/` (`AUDIO_API.md`, `EMBEDDINGS.md`, `REDACTION_GATEWAY.md`) and noted in release notes.
- **SSH-input safety:** any user-supplied value that reaches an SSH command on the Sparks MUST go through `app/shellsafe.py` — validate against a whitelist at the API boundary, then `quote_arg`/`quote_args` (`shlex.quote`) at the sink. Never raw f-string a user value into a command string. Existing sinks: `models.build_launch_command`, `download`, `nim`, `services`; `disk.py` keeps its own `_SAFE_DIRNAME` because it needs `$HOME` to expand server-side. The vLLM pre-flight (`validate.py`) relies on `shlex.split` cleanly reversing this quoting — preserve that invariant.
- **CSRF / same-origin:** state-mutating *control* endpoints are guarded by the `csrf_guard` middleware in `server.py` (rejects requests whose `Origin`/`Referer` host ≠ the served host). A new endpoint meant to be called **cross-origin by downstream apps** (a proxy/data endpoint) must be added to `_CSRF_EXEMPT_PREFIXES`, or browser POSTs from those apps will 403. No app-layer token auth by design (LAN/VPN-only; would break consumers).

## Layout

- `image/app/server.py` — FastAPI entry; routers live in sibling modules (`audio_proxy.py`, `llm_proxy.py`, `embeddings_proxy.py`, `redaction_gateway.py`, `swap.py`, `health.py`, `deep_health.py`, `connectivity.py`, …).
- `image/app/static/` — the dashboard UI.
- `image/models.yaml` — vLLM model catalog bundled into the image.
- `image/spark_embed/` — Dockerfile + app for the embeddings container; built ON a Spark (ARM64, NGC PyTorch base — see the audio/cluster rule for NGC torch-pinning caveats).