# Endpoint Monitor

A typed, unauthenticated FastAPI service for process-local monitor CRUD and secure on-demand HTTP checks. See [SERVICE_DESIGN.md](SERVICE_DESIGN.md) for the complete contract and [VERIFICATION.md](VERIFICATION.md) for honest generation-time evidence.

## Layout

- `app/main.py`: API composition and lifecycle
- `app/models.py`, `app/store.py`: schemas and lock-protected memory
- `app/security.py`, `app/checker.py`: SSRF policy, redirects, timing, HTTP
- `tests/`: API, checker/security, store, and redaction tests

## Local development

Requires Python 3.12.

```bash
python -m venv .venv
. .venv/bin/activate
pip install -e '.[dev]'
ruff format --check .
ruff check .
mypy app
pytest
uvicorn app.main:app --reload
```

Create and check a monitor:

```bash
curl -sS -X POST http://localhost:8000/v1/monitors \
  -H 'content-type: application/json' \
  -d '{"name":"example","url":"https://example.com/"}'
curl -sS -X POST http://localhost:8000/v1/monitors/UUID_FROM_ABOVE/check
curl -sS http://localhost:8000/v1/monitors/UUID_FROM_ABOVE/status
```

OpenAPI is at `/docs` and `/openapi.json`.

## Configuration

All settings are validated at startup. Variables are `MONITOR_REQUEST_TIMEOUT_SECONDS` (default 5, max 30), `MONITOR_CONNECT_TIMEOUT_SECONDS` (default 2, max 10), `MONITOR_MAX_REDIRECTS` (default 5, max 10), and `MONITOR_LOG_LEVEL` (default `INFO`).

## Container

```bash
docker build -t endpoint-monitor .
docker run --rm -p 8000:8000 endpoint-monitor
# or
docker compose up --build
curl -f http://localhost:8000/readyz
```

The image runs as a non-root user and intentionally starts one worker. Memory is lost on restart, is not shared between workers/containers, and has no durability or horizontal consistency. The API has no authentication and should not be exposed directly to untrusted networks. DNS re-resolution by the underlying HTTP transport leaves a DNS-rebinding window after policy validation; use network-level egress controls in production.