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steveandClaude Opus 4.8 84edf3e42a
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Add OIDC login via Authentik: PKCE, JIT provisioning, email linking (#5)
OIDC is pansy's primary login path (Authentik the target IdP); local
auth (#4) remains the fallback and both issue the same session cookie.

- deps: github.com/coreos/go-oidc/v3 + golang.org/x/oauth2 (both pure Go;
  CGO stays off).
- api/oidc.go: lazy issuer discovery (retried per-request, never crashes
  a server that also serves local auth), GET /auth/oidc/login builds an
  authorization-code URL with PKCE S256 + random state + nonce stashed in
  a short-lived HttpOnly cookie, GET /auth/oidc/callback verifies state
  (constant-time), exchanges the code with the PKCE verifier, verifies the
  ID token + nonce, and starts a pansy session. Failures redirect to
  /login?error=... ; success to /gardens.
- service.LoginOIDC: (issuer,subject) match -> login; else *verified*
  email match -> link onto the existing account; else JIT-create (the IdP
  gates access, so PANSY_REGISTRATION doesn't apply). Unverified email
  colliding with an existing account is refused (takeover guard); no email
  is refused (email is the account key). Reuses the atomic CreateUser.
- store: GetUserByOIDC + LinkOIDC (unique-pair backstop).
- config: OIDCReady() (needs issuer+client+BaseURL for the redirect URI);
  /auth/providers now reports oidc from it and defaults the button label
  to "Sign in with Authentik". OIDC routes are only registered when ready,
  so an unconfigured instance 404s them.
- PANSY_LOCAL_AUTH=false rejects/hides local auth but not OIDC.

Tests: service provisioning (JIT, repeat login, link, unverified-collision
refusal, no-email, name fallback, works with local auth off); api
(routes-absent-when-unconfigured, providers reporting, login redirect with
PKCE params + tx cookie via a fake discovery server, callback state/error
paths). Smoke-tested: unreachable issuer degrades to error=oidc_unavailable
with the server still up and local auth working.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01JdQpdYYsTgtkJBxbcpAszi
2026-07-18 17:13:47 -04:00

102 lines
4.6 KiB
Markdown

# pansy
Self-hostable garden planner: drag beds, bags, and containers onto a real-scale field, click into them to place freeform plops of plants, and zoom out to see what's planted where. Go backend + React frontend, one static binary.
See [DESIGN.md](DESIGN.md) for the architecture. Work is tracked in this repo's issues — start from the tracking epic.
## Quickstart
**Prerequisites:** Go 1.26+, Node 20+.
### Develop
Run the Go API and the Vite dev server together (Vite proxies `/api` → the API):
```sh
make dev
```
Then open http://localhost:5173. Or run the two halves in separate terminals for independent restarts:
```sh
make dev-api # Go API on :8080
make dev-web # Vite dev server on :5173
```
### Build & run
Produce the single static binary with the web build embedded, then run it:
```sh
make build
./pansy
```
Open http://localhost:8080 — one process serves both the JSON API and the app.
### Test
```sh
make test
```
## Configuration
All configuration is via environment variables; every value has a default, so `./pansy` runs with none set.
| Variable | Default | Description |
| ------------------------- | ------------------ | ------------------------------------------------------------------ |
| `PANSY_PORT` | `8080` | TCP port the HTTP server listens on. |
| `PANSY_DB` | `./pansy.db` | SQLite database file path (created if absent). |
| `PANSY_BASE_URL` | *(empty)* | Externally-visible base URL; used to derive the OIDC redirect URI. |
| `PANSY_REGISTRATION` | `open` | `open` or `closed` — gates local self-service signup. |
| `PANSY_LOCAL_AUTH` | `true` | Enable local password auth. Set `false` for pure-OIDC. |
| `PANSY_OIDC_ISSUER` | *(empty)* | OIDC issuer/discovery URL (Authentik). Enables SSO when set. |
| `PANSY_OIDC_CLIENT_ID` | *(empty)* | OIDC client ID. |
| `PANSY_OIDC_CLIENT_SECRET`| *(empty)* | OIDC client secret. |
| `PANSY_OIDC_BUTTON_LABEL` | `Sign in with Authentik` | Label for the OIDC button on the login page. |
| `PANSY_TRUSTED_PROXIES` | *(none)* | Comma-separated proxy CIDRs/IPs to trust for client-IP resolution. |
Local email/password auth is live (`POST /api/v1/auth/register`, `/auth/login`, `/auth/logout`, `GET /auth/me`, `GET /auth/providers`); the session is an HttpOnly cookie (`Secure` when `PANSY_BASE_URL` is https). The first account registered becomes admin, and it may register even when `PANSY_REGISTRATION=closed` to bootstrap the instance.
OIDC (Authentik-first) is live too: set `PANSY_OIDC_ISSUER`, `PANSY_OIDC_CLIENT_ID`, `PANSY_OIDC_CLIENT_SECRET`, and `PANSY_BASE_URL` (needed for the redirect URI). Register `PANSY_BASE_URL` + `/api/v1/auth/oidc/callback` as the redirect URI in your IdP. `GET /auth/oidc/login` starts an authorization-code + PKCE flow; first login provisions a user just-in-time (a matching *verified* email links to an existing local account instead of duplicating it). Provider discovery is lazy, so a briefly-unreachable IdP never blocks startup or local auth. Set `PANSY_LOCAL_AUTH=false` for pure-Authentik deployments (local register/login are then rejected and hidden from `/auth/providers`).
## Docker & deployment
CI (`.gitea/workflows/build-image.yml`) builds the single-binary image and pushes it to the Gitea registry on every branch push:
| Ref | Tag |
| --- | --- |
| `main` | `gitea.stevedudenhoeffer.com/steve/pansy:latest` |
| any other branch | `gitea.stevedudenhoeffer.com/steve/pansy:<branch-name>` |
| every build | `gitea.stevedudenhoeffer.com/steve/pansy:sha-<short>` (immutable; use to pin) |
The image runs as a non-root user, serves on `:8080`, and stores the SQLite database on the `/data` volume. Run it directly:
```sh
docker run -d --name pansy \
-p 8080:8080 \
-v pansy-data:/data \
gitea.stevedudenhoeffer.com/steve/pansy:latest
```
Or as a Komodo/Compose stack:
```yaml
services:
pansy:
image: gitea.stevedudenhoeffer.com/steve/pansy:${PANSY_TAG:-latest}
ports:
- "8080:8080"
volumes:
- pansy-data:/data
environment:
PANSY_BASE_URL: https://pansy.example.com
# PANSY_OIDC_ISSUER: ... # once auth (#5) lands
restart: unless-stopped
volumes:
pansy-data:
```
Pin `PANSY_TAG` to a `sha-<short>` tag for reproducible deploys, or leave it at `latest` to track `main`.