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julien 1513ad327c feat(portal-bff): openapi spec + scalar api reference UI (dev-only) (#143)
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## Summary

Adds an OpenAPI 3 spec + a [Scalar API Reference](https://scalar.com/) UI to `portal-bff`, dev-only. The BFF previously had no way to *see* its HTTP surface short of grepping for `@Get` / `@Post`; this PR generates the spec from the existing Nest controllers via [`@nestjs/swagger`](https://docs.nestjs.com/openapi/introduction) and renders it through Scalar — a modern alternative to the classic Swagger UI (single-page, fast, dark-mode native, better typography).

## What lands

### Two new dev-only routes

| Route | What it serves |
| --- | --- |
| `GET /api/openapi.json` | Raw OpenAPI 3 document. External tools (Bruno / Insomnia / Postman) import from here. |
| `GET /api/docs` | Scalar API Reference HTML page. Loads the JSON spec at render time and renders the full endpoint catalogue with a "Try it" panel. |

Both routes are gated behind `process.env.NODE_ENV !== 'production'` in [`setupOpenApi`](apps/portal-bff/src/openapi/openapi.ts) — production deployments don't need the docs surface, and publishing it would hand an attacker a curated map of every authenticated endpoint + every DTO shape. If a future ops use-case wants the spec in prod (internal gateway, contract testing), the gate is one line away from an opt-in `OPENAPI_PUBLISH=true` env knob.

### Core implementation — [`apps/portal-bff/src/openapi/openapi.ts`](apps/portal-bff/src/openapi/openapi.ts)

Two exported helpers:

- **`buildOpenApiDocument(app)`** — wraps Nest's `DocumentBuilder` + `SwaggerModule.createDocument`. Sets title, description (mentions the CSRF caveat — see below), version, and registers **two** cookie security schemes:
  - `portal_session` for the user-portal surface ([ADR-0009](docs/decisions/0009-auth-flow-oidc-pkce-msal-node.md)).
  - `portal_admin_session` for the admin-portal surface ([ADR-0020](docs/decisions/0020-portal-admin-app.md)).
  No `@ApiBearerAuth` is declared — the BFF never exposes a bearer-auth surface (SPA never holds tokens per ADR-0009; downstream OBO tokens are server-side only per ADR-0014).

- **`setupOpenApi(app, globalPrefix)`** — short-circuits in production, otherwise binds the two routes via the Express adapter directly (`app.getHttpAdapter().get(...)` and `app.use(...)`). The OpenAPI JSON is a static asset and Scalar is a vanilla Express middleware — wrapping either in a Nest controller would add zero value and an extra layer of indirection.

Wired into bootstrap at [`apps/portal-bff/src/main.ts:220`](apps/portal-bff/src/main.ts#L220), immediately after the JWKS endpoint mount and before `app.listen()`.

### Controllers decorated with `@ApiTags` / `@ApiOperation` / `@ApiCookieAuth`

Annotations are cosmetic but make the spec actually browsable. Tag taxonomy:

| Controller | Tag | Security |
| --- | --- | --- |
| [`AppController`](apps/portal-bff/src/app/app.controller.ts) | `app (scaffolding)` | — |
| [`HealthController`](apps/portal-bff/src/health/health.controller.ts) | `health` | — |
| [`AuthController`](apps/portal-bff/src/auth/auth.controller.ts) | `auth (user portal)` | `portal_session` on `/me` + `/logout` |
| [`AdminAuthController`](apps/portal-bff/src/admin/admin-auth.controller.ts) | `auth (admin portal)` | `portal_admin_session` on `/me` + `/logout` |
| [`AdminController`](apps/portal-bff/src/admin/admin.controller.ts) | `admin (self-test)` | class-level `portal_admin_session` |
| [`AdminAuditController`](apps/portal-bff/src/admin/admin-audit.controller.ts) | `admin (audit log)` | class-level `portal_admin_session` |
| [`AdminUsersController`](apps/portal-bff/src/admin/admin-users.controller.ts) | `admin (user directory)` | class-level `portal_admin_session` |

`@ApiOperation({ summary: … })` added on every route — populates the one-line description Scalar shows in its left-rail TOC.

### Deps + Jest

- `@nestjs/swagger ^11` (matches the Nest 11 major already pinned) and `@scalar/nestjs-api-reference` added to the workspace root.
- [`jest.config.cts`](apps/portal-bff/jest.config.cts) — widened `transformIgnorePatterns` from `/node_modules/(?!.*jose)/` to `/node_modules/(?!.*(jose|@scalar/))/`. `@scalar/client-side-rendering` (a transitive dep) ships ESM-only; without this widening the spec suite fails to load the module under ts-jest.

## Notes for the reviewer

- **Why two cookie schemes rather than one?** Scalar renders a per-endpoint lock icon driven by the security scheme name. Splitting `portal_session` / `portal_admin_session` keeps the indicator semantically truthful — `/api/auth/me` and `/api/admin/auth/me` look identical otherwise.
- **CSRF caveat.** Mutating routes (`POST` / `PUT` / `PATCH` / `DELETE`) require `X-CSRF-Token` per [ADR-0009](docs/decisions/0009-auth-flow-oidc-pkce-msal-node.md). The header must be set manually in Scalar's "Try it" panel to the value of the `portal_csrf` cookie when exercising those routes. The spec description mentions it; auto-injecting the header from the cookie is a future polish.
- **No ADR for this.** `@nestjs/swagger` is the framework's own first-party tooling; Scalar is a thin UI on top of a standard OpenAPI 3 document. Both replaceable without touching the controllers (the `@Api*` annotations are spec-standard). Dev-only, no prod surface — doesn't cross any of the bars that warrant an ADR per [CLAUDE.md](CLAUDE.md).
- **Express-layer routing.** Same pattern as the JWKS endpoint (#139): the OpenAPI JSON is a static asset and Scalar a vanilla Express handler, so wiring through Nest's router adds no value.

## Test plan

- [x] **5 new specs** in [`apps/portal-bff/src/openapi/openapi.spec.ts`](apps/portal-bff/src/openapi/openapi.spec.ts) — document shape (openapi version, title, version), both cookie schemes declared, smoke controller route captured in `paths`, production short-circuit (no routes mounted, no `app.use` called), dev mount (JSON at `/api/openapi.json` via the HTTP adapter, Scalar UI at `/api/docs` via `app.use`).
- [x] `pnpm nx test portal-bff` — **396 specs pass** (was 391).
- [x] `pnpm exec nx affected -t format:check lint test build --base=origin/main` — clean.
- [x] Manual dev smoke: `pnpm nx serve portal-bff`, `curl /api/openapi.json | jq .info` returns title + version, open `/api/docs` in a browser, every controller's routes visible under their tag, lock icons match the cookie scheme on guarded routes.

## What's next — light follow-ups

Not blocking this PR; mentioned so they're not lost:

- Auto-inject the `X-CSRF-Token` header in Scalar from the `portal_csrf` cookie (custom Scalar config preset).
- Promote `@ApiOperation` summaries with multi-line `description`s on the more involved routes (`/api/admin/audit`, `/api/admin/users`).
- Annotate DTOs with `@ApiProperty` once the first contract-test consumer arrives — Nest can also pick them up automatically with the `@nestjs/swagger` ts-plugin if we wire it into the Nx build target. Deferred until the spec is consumed by tooling that benefits from the precision.

---------

Co-authored-by: Julien Gautier <julien.gautier@apf.asso.fr>
Reviewed-on: #143
2026-05-14 20:52:03 +02:00
julien 1df99cd800 feat(portal-bff): admin user-directory read endpoint (#141)
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## Summary

Second PR of the **portal-admin User-list chantier** per [ADR-0020](docs/decisions/0020-portal-admin-app.md) §"v1 scope — User list (read-only)". Ships the **read side**: paginated, filterable HTTP endpoint that queries the `public.users` directory populated at sign-in by PR #140. The SPA viewer screen lands in the final PR of the chantier.

## What lands

### [`AdminUsersQueryDto`](apps/portal-bff/src/admin/users-query.dto.ts)

Mirrors `AdminAuditQueryDto`'s posture — filters all optional, every unknown query key rejected by `forbidNonWhitelisted`, limit capped at **200** / default **50**.

| Filter | Type | Notes |
| --- | --- | --- |
| `username` | string ≤128 | Exact-prefix match (Prisma `startsWith`). |
| `displayName` | string ≤128 | Case-insensitive `contains` (display names vary in casing). |
| `audience` | enum | `workforce` \| `customer`. |
| `lastSeenAtFrom` | ISO-8601 | Inclusive lower bound. |
| `lastSeenAtTo` | ISO-8601 | Exclusive upper bound. |
| `limit` | int 1..200 | Default **50**. |
| `offset` | int ≥0 | Default **0**. |

### [`AdminUsersReader`](apps/portal-bff/src/admin/admin-users-reader.service.ts)

Prisma typed client against `public.users` — **no `SET LOCAL ROLE`** dance because `public.users` has no role-based privilege gate. The trust boundary is the controller's `@RequireAdmin` guard.

- **Order**: `last_seen_at DESC, oid ASC`. The second clause is a deterministic tie-breaker for pagination during sign-in bursts that share a timestamp.
- **COUNT + SELECT in one Prisma transaction** so the `total` reported to the SPA matches what's on the page even under a concurrent sign-in landing between the two queries.
- **Hard cap on limit** at 200 even when a caller bypasses the DTO — defense in depth on the BFF's event loop.

### [`AdminUsersController`](apps/portal-bff/src/admin/admin-users.controller.ts)

`GET /api/admin/users`, `@RequireAdmin()` at the class level. Forwards the validated DTO to `AdminUsersReader`, then emits `admin.users.query` with `{ filters, resultCount }` — the fishing-expedition deterrent (mirror of `admin.audit.query` from PR #132).

### [`AuditWriter.adminUsersQuery()`](apps/portal-bff/src/audit/audit.service.ts)

New typed method + `AdminUsersQueryInput` type. Same `outcome=success` / payload shape as `adminAuditQuery` — two distinct event types so a reviewer can pivot directly on `eventType` without parsing payload.

## Notes for the reviewer

- The shape mirrors `AdminAuditController` (#132) deliberately. Future admin read endpoints (CMS pages, menu items if they grow read filters) should adopt the same shape — keeps the SPA's data-flow pattern consistent across modules.
- `public.users` queries don't need `SET LOCAL ROLE` because there's no append-only / read-only role split on the table. That's a deliberate v1 simplification; if the security review later asks for stricter isolation we'd add a `users_reader` role + the same SET-LOCAL pattern AuditReader uses.
- The future "sign-in counts" join from `audit.events` on `actor_id_hash` is **deferred**. The salted hash is computable on the fly via `HashUserIdService`, so adding it later is a service-level change — no schema migration required.
- The `actor_id_hash` is deliberately **NOT** stored on `public.users` (per ADR-0013's invariant — the salt stays inside the audit module).

## Test plan

- [x] `pnpm nx test portal-bff` — **391 specs pass** (was 365; +26 covering DTO validation, reader transaction shape + filter forwarding + pagination defaults + cap, controller path, audit typed method).
- [x] `pnpm exec nx affected -t format:check lint test build --base=origin/main` — clean.
- [x] Prisma transaction shape verified: COUNT + SELECT both fire exactly once per call; tuple-return contract honoured.
- [x] Filter projections verified per filter: username `startsWith`, displayName case-insensitive `contains`, audience exact match, lastSeenAt `gte/lt` composition.
- [ ] e2e — pending the admin SPA viewer screen + a real admin session. Once both exist: `curl --cookie 'portal_admin_session=...' /api/admin/users?username=jane&limit=10` returns the matching subset and a new `admin.users.query` audit row lands.

## What's next

The chantier's final PR:

- **portal-admin `/users` screen** — SPA viewer with filter form + table + pagination. Same shape as the `/audit` page (PR #136): signal-driven state, color-coded badges for audience, ISO timestamps formatted locale-side, status states. Will graduate the sidebar entry from `aria-disabled` "Soon" badge to a live link.

---------

Co-authored-by: Julien Gautier <julien.gautier@apf.asso.fr>
Reviewed-on: #141
2026-05-14 20:01:38 +02:00