fitguide/README.md

# FastAPI Skeleton

A production-shaped starting point for a web app that serves both **HTML (HTMX)** and a **JSON API**.

## Stack

| Concern        | Choice |
|----------------|--------|
| Web framework  | FastAPI |
| HTML / interactivity | Jinja2 + HTMX |
| ORM            | SQLAlchemy 2.0 (async) |
| Migrations     | Alembic |
| Database       | SQLite (default) or Postgres — one `DATABASE_URL` |
| Auth           | JWT access + refresh tokens, rotation, DB-backed revocation |
| Authorization  | RBAC: users → roles → permissions |
| Admin UI       | Custom HTMX dashboard (user & role CRUD) |
| Config         | env vars **or** `.env` (pydantic-settings) |
| Tooling        | uv, pytest, ruff |
| Packaging      | Dockerfile + docker-compose |

## Layout

```
app/
  core/        config, database engine/session, security (hashing + JWT)
  models/      SQLAlchemy models: user, role, permission, refresh_token
  schemas/     Pydantic request/response models
  crud/        data-access helpers
  services/    auth token issuance / rotation
  deps.py      DI: get_db, current user, require_permission(...)
  api/         JSON API: auth, users, roles
  web/         HTML/HTMX routes: pages + admin dashboard
  templates/   Jinja2 templates (+ admin partials)
  static/      CSS
alembic/       migration environment + initial migration
scripts/seed.py  bootstrap permissions, roles, first superuser
tests/         pytest (auth + RBAC)
```

## Starting a new project

Fork or copy this repo, then update these six things before writing any code:

### 1. Project package name — `pyproject.toml`

```toml
[project]
name = "my-app"                         # used by uv/pip
description = "What your app does."
```

### 2. Application display name — `.env` / environment

The name shown in the browser title bar, nav bar, and `/docs` page title is
driven by `APP_NAME` in your `.env` (or any environment variable override):

```bash
APP_NAME="My App"
```

This is the only runtime change needed — templates read `{{ app_name }}`
from `settings.app_name`, which is sourced from this variable. No template
edits required.

### 3. Superuser credentials — `.env`

```bash
FIRST_SUPERUSER_EMAIL=admin@yourapp.com
FIRST_SUPERUSER_PASSWORD=<strong-password>
```

### 4. Secret key — `.env`

```bash
SECRET_KEY="$(python -c 'import secrets; print(secrets.token_urlsafe(48))')"
```

Never commit a real secret key. The placeholder in `.env.example` is intentionally weak.

### 5. Docker / Postgres identifiers — `docker-compose.yml`

The compose file uses `app` as the Postgres username, password, and database
name. Rename them consistently:

```yaml
# db service
POSTGRES_USER: myapp
POSTGRES_PASSWORD: <strong-password>
POSTGRES_DB: myapp

# app service
DATABASE_URL: postgresql+asyncpg://myapp:<strong-password>@db:5432/myapp
```

### 6. This README

Replace the title and description with your project's own.

---

After these changes, run the normal setup:

```bash
uv sync --extra dev
cp .env.example .env   # edit the values above
uv run python -m scripts.seed
uv run uvicorn app.main:app --reload
```

## Quick start (local, SQLite)

```bash
# 1. Install dependencies (https://docs.astral.sh/uv/)
uv sync --extra dev

# 2. Configure (optional — sensible defaults exist)
cp .env.example .env        # then edit SECRET_KEY etc.

# 3. Seed default roles/permissions + the first superuser
uv run python -m scripts.seed

# 4. Run
uv run uvicorn app.main:app --reload
```

Open:
- http://localhost:8000/ — HTMX dashboard (log in with the seeded superuser)
- http://localhost:8000/docs — interactive API docs
- http://localhost:8000/admin/users — admin dashboard

Default superuser (override via env/`.env`): `admin@example.com` / `changethis`.

## Run with Docker (Postgres)

```bash
docker compose up --build
```

This starts Postgres, seeds the database, and serves the app on
http://localhost:8000. The app connects with
`DATABASE_URL=postgresql+asyncpg://app:app@db:5432/app`.

## Configuration

Every setting is read from an environment variable first, then `.env`
(see `.env.example`). Key ones:

| Variable | Default | Notes |
|----------|---------|-------|
| `SECRET_KEY` | dev placeholder | **set a strong value in production** |
| `DATABASE_URL` | `sqlite+aiosqlite:///./app.db` | use `postgresql+asyncpg://...` for Postgres |
| `ACCESS_TOKEN_EXPIRE_MINUTES` | `15` | |
| `REFRESH_TOKEN_EXPIRE_DAYS` | `7` | |
| `AUTO_CREATE_TABLES` | `true` | create tables on startup (dev); use Alembic in prod |
| `COOKIE_SECURE` | `false` | set `true` behind HTTPS |
| `FIRST_SUPERUSER_EMAIL` / `_PASSWORD` | admin@example.com / changethis | used by seed |

## Auth model

- `POST /api/auth/register` — self-service signup (gets the default `user` role)
- `POST /api/auth/login` — OAuth2 password form (`username` = email) → access + refresh
- `POST /api/auth/refresh` — rotates: the presented refresh token is revoked, a new pair is issued
- `POST /api/auth/logout` — revoke one refresh token (body) or all for the user

The JSON API authenticates via `Authorization: Bearer <access>`. The HTMX UI
stores the access token in an httpOnly cookie so pages work without client JS.

Refresh tokens are stored server-side as a SHA-256 hash + `jti` with a `revoked`
flag, so logout and rotation genuinely invalidate them.

## RBAC

`users → roles → permissions`. Permissions follow `resource:action`
(`users:read`, `users:write`, `users:delete`, `roles:read`, `roles:write`).
Protect an endpoint with the dependency factory:

```python
@router.get("", dependencies=[Depends(require_permission("users:read"))])
async def list_users(...): ...
```

Superusers (`is_superuser=True`) bypass all permission checks.

## Migrations (Alembic)

`AUTO_CREATE_TABLES` is convenient for dev/SQLite. For real deployments use
migrations instead:

```bash
# apply the bundled initial migration
uv run alembic upgrade head

# after changing models, autogenerate the next revision
uv run alembic revision --autogenerate -m "describe change"
uv run alembic upgrade head
```

The Alembic env reads `DATABASE_URL` from app settings, so it targets the same
database as the app.

## Tests

```bash
uv run pytest
```

Tests run against an in-memory SQLite database and cover the auth lifecycle
(register/login/me/refresh/logout) and RBAC enforcement.

## Where to go next

- Add your own models in `app/models/`, schemas in `app/schemas/`, routes in `app/api/` or `app/web/`.
- Add permissions to `scripts/seed.py` and guard routes with `require_permission(...)`.
- Swap `HS256` for asymmetric `RS256` keys if you need to verify tokens in other services.