fix: Use HttpClient wrappers that ensure success to match FusionCache expectations

src/Digdir.Domain.Dialogporten.Infrastructure/Altinn/Authorization/AltinnAuthorizationClient.cs

@@ -170,20 +170,7 @@ await SendRequest<List<AuthorizedPartiesResultDto>>(
 
     private async Task<T?> SendRequest<T>(string url, object request, CancellationToken cancellationToken)
     {
-        var requestJson = JsonSerializer.Serialize(request, SerializerOptions);
-        _logger.LogDebug("Authorization request to {Url}: {RequestJson}", url, requestJson);
-        var httpContent = new StringContent(requestJson, Encoding.UTF8, "application/json");
-        var response = await _httpClient.PostAsync(url, httpContent, cancellationToken);
-        if (response.StatusCode != HttpStatusCode.OK)
-        {
-            var errorResponse = await response.Content.ReadAsStringAsync(cancellationToken);
-            _logger.LogWarning("AltinnAuthorizationClient.SendRequest failed with non-successful status code: {StatusCode} {Response}",
-                response.StatusCode, errorResponse);
-
-            return default;
-        }
-
-        var responseData = await response.Content.ReadAsStringAsync(cancellationToken);
-        return JsonSerializer.Deserialize<T>(responseData, SerializerOptions);
+        _logger.LogDebug("Authorization request to {Url}: {RequestJson}", url, JsonSerializer.Serialize(request, SerializerOptions));
+        return await _httpClient.PostAsJsonEnsuredAsync<T>(url, request, serializerOptions: SerializerOptions, cancellationToken: cancellationToken);
     }
 }

src/Digdir.Domain.Dialogporten.Infrastructure/Altinn/Events/AltinnEventsClient.cs

@@ -1,5 +1,4 @@
 using System.Net.Http.Headers;
-using System.Net.Http.Json;
 using Digdir.Domain.Dialogporten.Application.Externals;
 using Digdir.Domain.Dialogporten.Infrastructure.Common.Serialization;
 using Microsoft.Extensions.Logging;
@@ -16,16 +15,13 @@ public AltinnEventsClient(HttpClient client)
     }
 
     public async Task Publish(CloudEvent cloudEvent, CancellationToken cancellationToken)
-    {
-        var uriBuilder = new UriBuilder(_client.BaseAddress!) { Path = "/events/api/v1/events" };
-        var msg = new HttpRequestMessage(HttpMethod.Post, uriBuilder.Uri)
-        {
-            Content = JsonContent.Create(cloudEvent, options: SerializerOptions.CloudEventSerializerOptions)
-        };
-        msg.Content.Headers.ContentType = new MediaTypeHeaderValue("application/cloudevents+json");
-        var response = await _client.SendAsync(msg, cancellationToken);
-        response.EnsureSuccessStatusCode();
-    }
+        => await _client.PostAsJsonEnsuredAsync(
+            "/events/api/v1/events",
+            cloudEvent,
+            serializerOptions: SerializerOptions.CloudEventSerializerOptions,
+            configureContentHeaders: h
+                => h.ContentType = new MediaTypeHeaderValue("application/cloudevents+json"),
+            cancellationToken: cancellationToken);
 }
 
 internal class ConsoleLogEventBus : ICloudEventBus

src/Digdir.Domain.Dialogporten.Infrastructure/Altinn/NameRegistry/NameRegistryClient.cs

@@ -1,35 +1,25 @@
-using System.Net;
-using System.Text;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 using Digdir.Domain.Dialogporten.Application.Externals;
-using Microsoft.Extensions.Caching.Distributed;
-using Microsoft.Extensions.Logging;
 using ZiggyCreatures.Caching.Fusion;
 
 namespace Digdir.Domain.Dialogporten.Infrastructure.Altinn.NameRegistry;
 
 internal class NameRegistryClient : INameRegistry
 {
-    private static readonly DistributedCacheEntryOptions OneDayCacheDuration = new() { AbsoluteExpiration = DateTimeOffset.UtcNow.AddDays(1) };
-    private static readonly DistributedCacheEntryOptions ZeroCacheDuration = new() { AbsoluteExpiration = DateTimeOffset.MinValue };
-
     private readonly IFusionCache _cache;
     private readonly HttpClient _client;
-    private readonly ILogger<NameRegistryClient> _logger;
 
     private static readonly JsonSerializerOptions SerializerOptions = new()
-
     {
         PropertyNameCaseInsensitive = true,
         DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingDefault
     };
 
-    public NameRegistryClient(HttpClient client, IFusionCacheProvider cacheProvider, ILogger<NameRegistryClient> logger)
+    public NameRegistryClient(HttpClient client, IFusionCacheProvider cacheProvider)
     {
         _client = client ?? throw new ArgumentNullException(nameof(client));
         _cache = cacheProvider.GetCache(nameof(NameRegistry)) ?? throw new ArgumentNullException(nameof(cacheProvider));
-        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
     }
 
     public async Task<string?> GetName(string personalIdentificationNumber, CancellationToken cancellationToken)
@@ -51,24 +41,13 @@ public NameRegistryClient(HttpClient client, IFusionCacheProvider cacheProvider,
             ]
         };
 
-        var requestJson = JsonSerializer.Serialize(nameLookup, SerializerOptions);
-        var httpContent = new StringContent(requestJson, Encoding.UTF8, "application/json");
-
-        var response = await _client.PostAsync(apiUrl, httpContent, cancellationToken);
-
-        if (response.StatusCode != HttpStatusCode.OK)
-        {
-            var errorResponse = await response.Content.ReadAsStringAsync(cancellationToken);
-            _logger.LogWarning(
-                nameof(NameRegistryClient) + ".SendRequest failed with non-successful status code: {StatusCode} {Response}",
-                response.StatusCode, errorResponse);
-
-            return null;
-        }
+        var nameLookupResult = await _client.PostAsJsonEnsuredAsync<NameLookupResult>(
+            apiUrl,
+            nameLookup,
+            serializerOptions: SerializerOptions,
+            cancellationToken: cancellationToken);
 
-        var responseData = await response.Content.ReadAsStringAsync(cancellationToken);
-        var nameLookupResult = JsonSerializer.Deserialize<NameLookupResult>(responseData, SerializerOptions);
-        return nameLookupResult?.PartyNames.FirstOrDefault()?.Name;
+        return nameLookupResult.PartyNames.FirstOrDefault()?.Name;
     }
 
     private sealed class NameLookup

src/Digdir.Domain.Dialogporten.Infrastructure/Altinn/OrganizationRegistry/OrganizationRegistryClient.cs

@@ -1,7 +1,4 @@
-using System.Diagnostics;
-using System.Net.Http.Json;
 using Digdir.Domain.Dialogporten.Application.Externals;
-using Microsoft.Extensions.Caching.Distributed;
 using ZiggyCreatures.Caching.Fusion;
 
 namespace Digdir.Domain.Dialogporten.Infrastructure.Altinn.OrganizationRegistry;
@@ -10,9 +7,6 @@ internal class OrganizationRegistryClient : IOrganizationRegistry
 {
     private const string OrgNameReferenceCacheKey = "OrgNameReference";
 
-    private static readonly DistributedCacheEntryOptions OneDayCacheDuration = new() { AbsoluteExpiration = DateTimeOffset.UtcNow.AddDays(1) };
-    private static readonly DistributedCacheEntryOptions ZeroCacheDuration = new() { AbsoluteExpiration = DateTimeOffset.MinValue };
-
     private readonly IFusionCache _cache;
     private readonly HttpClient _client;
 
@@ -33,8 +27,9 @@ public OrganizationRegistryClient(HttpClient client, IFusionCacheProvider cacheP
     private async Task<Dictionary<string, OrganizationInfo>> GetOrgInfo(CancellationToken cancellationToken)
     {
         const string searchEndpoint = "orgs/altinn-orgs.json";
+
         var response = await _client
-            .GetFromJsonAsync<OrganizationRegistryResponse>(searchEndpoint, cancellationToken) ?? throw new UnreachableException();
+            .GetFromJsonEnsuredAsync<OrganizationRegistryResponse>(searchEndpoint, cancellationToken: cancellationToken);
 
         var orgInfoByOrgNumber = response
             .Orgs
@@ -65,4 +60,4 @@ private sealed class OrganizationDetails
         public string? Homepage { get; init; }
         public IList<string>? Environments { get; init; }
     }
-}
+}

src/Digdir.Domain.Dialogporten.Infrastructure/Altinn/ResourceRegistry/ResourceRegistryClient.cs

@@ -34,9 +34,10 @@ public async Task<IReadOnlyCollection<string>> GetResourceIds(string org, Cancel
     private async Task<Dictionary<string, string[]>> GetResourceIdsByOrg(CancellationToken cancellationToken)
     {
         const string searchEndpoint = "resourceregistry/api/v1/resource/resourcelist";
+
         var response = await _client
-            .GetFromJsonAsync<List<ResourceRegistryResponse>>(searchEndpoint, cancellationToken)
-            ?? throw new UnreachableException();
+            .GetFromJsonEnsuredAsync<List<ResourceRegistryResponse>>(searchEndpoint,
+                cancellationToken: cancellationToken);
 
         var resourceIdsByOrg = response
             .Where(x => x.ResourceType is ResourceTypeGenericAccess or ResourceTypeAltinnApp)

src/Digdir.Domain.Dialogporten.Infrastructure/HttpClientExtensions.cs

@@ -0,0 +1,61 @@
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+using System.Text.Json;
+
+namespace Digdir.Domain.Dialogporten.Infrastructure;
+
+public static class HttpClientExtensions
+{
+    public static async Task<T> GetFromJsonEnsuredAsync<T>(
+        this HttpClient client,
+        string requestUri,
+        Action<HttpRequestHeaders>? configureHeaders = null,
+        CancellationToken cancellationToken = default)
+    {
+        var httpRequestMessage = new HttpRequestMessage(HttpMethod.Get, requestUri);
+        configureHeaders?.Invoke(httpRequestMessage.Headers);
+        var response = await client.SendAsync(httpRequestMessage, cancellationToken);
+        response.EnsureSuccessStatusCode();
+        var result = await response.Content.ReadFromJsonAsync<T>(cancellationToken: cancellationToken);
+        return result is null
+            ? throw new InvalidOperationException($"Failed to deserialize JSON from {requestUri}")
+            : result;
+    }
+
+    public static async Task<HttpResponseMessage> PostAsJsonEnsuredAsync(
+        this HttpClient client,
+        string requestUri,
+        object content,
+        Action<HttpRequestHeaders>? configureHeaders = null,
+        Action<HttpContentHeaders>? configureContentHeaders = null,
+        JsonSerializerOptions? serializerOptions = null,
+        CancellationToken cancellationToken = default)
+    {
+        var httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, requestUri)
+        {
+            Content = JsonContent.Create(content, options: serializerOptions)
+        };
+        configureHeaders?.Invoke(httpRequestMessage.Headers);
+        configureContentHeaders?.Invoke(httpRequestMessage.Content.Headers);
+        var response = await client.SendAsync(httpRequestMessage, cancellationToken);
+        response.EnsureSuccessStatusCode();
+        return response;
+    }
+
+    public static async Task<T> PostAsJsonEnsuredAsync<T>(
+        this HttpClient client,
+        string requestUri,
+        object content,
+        Action<HttpRequestHeaders>? configureHeaders = null,
+        Action<HttpContentHeaders>? configureContentHeaders = null,
+        JsonSerializerOptions? serializerOptions = null,
+        CancellationToken cancellationToken = default)
+    {
+        var response = await client.PostAsJsonEnsuredAsync(requestUri, content, configureHeaders,
+            configureContentHeaders, serializerOptions, cancellationToken);
+        var result = await response.Content.ReadFromJsonAsync<T>(cancellationToken: cancellationToken);
+        return result is null
+            ? throw new InvalidOperationException($"Failed to deserialize JSON to type {typeof(T).FullName} from {requestUri}")
+            : result;
+    }
+}

src/Digdir.Domain.Dialogporten.WebApi/Common/Extensions/ErrorResponseBuilderExtensions.cs

@@ -1,6 +1,7 @@
 using FluentValidation.Results;
 using Microsoft.AspNetCore.Mvc;
 using System.Diagnostics;
+using Altinn.Authorization.ABAC.Constants;
 
 namespace Digdir.Domain.Dialogporten.WebApi.Common.Extensions;
 
@@ -64,6 +65,15 @@ public static object ResponseBuilder(List<ValidationFailure> failures, HttpConte
                 Instance = ctx.Request.Path,
                 Extensions = { { "traceId", Activity.Current?.Id ?? ctx.TraceIdentifier } }
             },
+            StatusCodes.Status502BadGateway => new ProblemDetails
+            {
+                Title = "Bad gateway.",
+                Detail = "An upstream server returned an invalid response. Please try again later.",
+                Type = "https://datatracker.ietf.org/doc/html/rfc7231#section-6.6.3",
+                Status = statusCode,
+                Instance = ctx.Request.Path,
+                Extensions = { { "traceId", Activity.Current?.Id ?? ctx.TraceIdentifier } }
+            },
             _ => new ProblemDetails
             {
                 Title = "An error occurred while processing the request.",

src/Digdir.Domain.Dialogporten.WebApi/Common/Extensions/ExceptionHandlerExtensions.cs

@@ -22,7 +22,9 @@ public static IApplicationBuilder UseProblemDetailsExceptionHandler(this IApplic
                 var error = exHandlerFeature.Error.Message;
                 var logger = ctx.Resolve<ILogger<ExceptionHandler>>();
                 logger.LogError(exHandlerFeature.Error, "{@Http}{@Type}{@Reason}", http, type, error);
-                ctx.Response.StatusCode = StatusCodes.Status500InternalServerError;
+                ctx.Response.StatusCode = type == nameof(HttpRequestException)
+                        ? StatusCodes.Status502BadGateway
+                        : StatusCodes.Status500InternalServerError;
                 ctx.Response.ContentType = "application/problem+json";
                 await ctx.Response.WriteAsJsonAsync(ctx.ResponseBuilder(ctx.Response.StatusCode));
             });