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atomic-design-poc/docs/project/backlog/WP-49-openzaak-zaken-read-seam.md
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feat(backend): expand stamdata + OpenZaak-ready cases seam (WP-49)
Stamdata: add beroepen, opleidingen (temporal), and specialismen tables to the
schema-driven catalog (zero UI code). opleidingen.beroep and specialismen.beroep
both reference beroepen.code — the first stamdata->stamdata references, enforced by
two new StamdataRef entries in the CI gate.

OpenZaak/ZGW (WP-49, slice 1 — read-only zaken): introduce IZaakSource as the cases
read seam. Default LocalZaakSource reads the local SQLite store (offline); an
OpenZaakZaakSource (Zgw/ client: HS256 per-call JWT, ZGW->existing-DTO mapper,
paginating HTTP source) is selected behind Zgw:Enabled (default false). The FE never
changes — same ApplicationSummaryDto, no api-client drift. Unit-tested with fixtures
+ a stub HttpMessageHandler; no live OpenZaak needed.

Docs: ADR-0005, reference/openzaak-integration.md, WP-49..52 roadmap, stamdata.md
update, README index rows.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-24 15:01:06 +02:00

2.5 KiB

WP-49 — OpenZaak zaken read seam (slice 1)

Status: done Phase: 9 — OpenZaak / ZGW integration

Why

The POC serves cases from local SQLite. To grow toward production it must be able to source them from a real ZGW backend (OpenZaak) without changing the frontend (BFF-lite, ADR-0001). The backend had no data-access abstraction to swap behind, no outbound HTTP, and no JWT. This is the first thin vertical slice: read-only zaken.

Read first

Decisions (pre-made, don't relitigate)

  • OpenZaak's anti-corruption layer lives in the BFF, never the browser.
  • Source selected by config (Zgw:Enabled, default false) → POC still runs offline.
  • Each source maps into the existing ApplicationSummaryDto → no api-client drift, no FE change.
  • Fresh HS256 JWT per call (no refresh flow). Hand-rolled (no new NuGet).
  • IZaakSource is sync (matches the endpoint + local store); OpenZaak source does sync-over-async.

Files

  • Data/IZaakSource.cs, Data/LocalZaakSource.cs
  • Zgw/{ZgwOptions,ZgwTokenProvider,ZgwZaakMapper,OpenZaakZaakSource}.cs
  • Program.cs (DI + resolve IZaakSource in /admin/cases), appsettings.json (Zgw section)
  • tests: ZgwTokenProviderTests, ZgwZaakMapperTests, OpenZaakZaakSourceTests

Steps

  1. Extract the cases read into IZaakSource; LocalZaakSource delegates to ApplicationStore.
  2. Build the Zgw/ client (options, JWT minter, ZGW→DTO mapper, paginating HTTP source).
  3. Wire DI by config; refactor /admin/cases to resolve IZaakSource.
  4. Unit-test the minter, mapper, and source (fixtures + stub HttpMessageHandler).

Acceptance criteria

  • /admin/cases serves identical DTOs via LocalZaakSource (default, offline).
  • OpenZaakZaakSource follows pagination, resolves+caches zaaktype labels, sends a Bearer token.
  • JWT verifies (HS256) with the required claims.
  • dotnet test green (142); npm run ci green with no api-client drift (FE untouched).

Verification

cd backend && dotnet test; npm run ci; manual: /beheer/zaken still lists cases with Zgw:Enabled=false.

Out of scope

Create-zaak (WP-50), Documenten/DRC (WP-51), Notificaties (WP-52), real inbound OIDC/JWT, OpenZaak in docker-compose.

Risks

Sync-over-async blocks a thread under load if OpenZaak becomes the default → make the read path async then (noted at the call site).