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feat(domain,bff): current-registration lookup for self-service resume (refs #111)

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Backend half of S-26. The domain gains IRegistrationStore.FindOpenByBsnAsync (the
citizen's non-terminal INGEDIEND/IN_BEHANDELING registration) + GET
/registrations/current?bsn=; the BFF adds owner-scoped GET /self-service/registrations
(bsn from the DigiD token) returning that registration or 204 when none. Regenerated
services/bff/openapi.json for the new endpoint (the api-client is generated from it).
Store + BFF endpoint unit tests; acceptance/BFF fakes updated for the new members.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
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2026-07-22 17:04:35 +02:00
co-authored by Claude Opus 4.8
parent 5de8c1e292
commit 24927b1e80
12 changed files with 229 additions and 0 deletions
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services/bff/Bff.Api/DownstreamClients.cs
+20
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@@ -5,6 +5,10 @@ namespace Bff.Api;
/// <summary>What the self-service submit returns to the portal (the domain's registration id + status).</summary>
public sealed record SubmitAccepted(string RegistrationId, string Status);
/// <summary>The caller's current open registration, for resuming the self-service portal after a
/// refresh (S-26): the reference (registration id) + its status.</summary>
public sealed record CurrentRegistration(string RegistrationId, string Status);
/// <summary>A projection row as the projection-api serves it. <c>Bsn</c>/<c>NaamPlaceholder</c> are
/// read but never surfaced by the openbaar endpoint (public-safe filtering, ADR-0010/S-09).
/// <c>Reference</c> is the public-safe citizen reference (the zaak identificatie, #78).</summary>
@@ -22,6 +26,10 @@ public interface IDomainClient
{
Task<SubmitAccepted> SubmitRegistrationAsync(string bsn, CancellationToken ct = default);
/// <summary>The caller's current open registration (resume after refresh, S-26), or <c>null</c>
/// when they have none in flight. Owner-scoped by <paramref name="bsn"/>.</summary>
Task<CurrentRegistration?> GetCurrentRegistrationAsync(string bsn, CancellationToken ct = default);
/// <summary>Withdraw the caller's own registration ("trek aanvraag in"). Owner-scoped by
/// <paramref name="bsn"/>. Returns <c>false</c> when the domain reports the registration is
/// unknown or not the caller's (404), so the BFF can relay a 404 rather than a 500.</summary>
@@ -58,6 +66,18 @@ public sealed class DomainClient(HttpClient http) : IDomainClient
return new SubmitAccepted(dto.RegistrationId, dto.Status);
}
public async Task<CurrentRegistration?> GetCurrentRegistrationAsync(string bsn, CancellationToken ct = default)
{
using var response = await http.GetAsync($"registrations/current?bsn={Uri.EscapeDataString(bsn)}", ct);
// The domain 404s when the citizen has no open registration — that's "none", not an error.
if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
return null;
response.EnsureSuccessStatusCode();
var dto = await response.Content.ReadFromJsonAsync<DomainResponse>(ct)
?? throw new InvalidOperationException("The Domain Service returned an empty registration response.");
return new CurrentRegistration(dto.RegistrationId, dto.Status);
}
public async Task<bool> WithdrawRegistrationAsync(string registrationId, string bsn, CancellationToken ct = default)
{
using var response = await http.PostAsJsonAsync(