From 9bf76764640eb5cfbc2e3613e442924062cc5495 Mon Sep 17 00:00:00 2001
From: TekH <h.tek@digitaldata.works>
Date: Fri, 4 Sep 2026 01:07:27 +0200
Subject: [PATCH] =?UTF-8?q?SF-74:=20Client=20=E2=80=94=20CustomImagesServi?=
 =?UTF-8?q?ce=20(in-memory=20cache,=20GET=20/api/CustomImages),=20DI=20reg?=
 =?UTF-8?q?istration?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../Program.cs                                |  3 +
 .../Services/CustomImagesService.cs           | 55 +++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Services/CustomImagesService.cs

diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Program.cs b/EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Program.cs
index 863f0b58..c6be87e1 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Program.cs
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Program.cs
@@ -38,6 +38,9 @@ builder.Services.AddScoped<EnvelopeService>();
 builder.Services.AddScoped<UserPreferencesService>();
 builder.Services.AddScoped<ThemeService>();
 
+// Logo configuration (loaded once after login, in-memory cached)
+builder.Services.AddScoped<CustomImagesService>();
+
 // DevExpress WASM
 builder.Services.AddDevExpressWebAssemblyBlazorPdfViewer();
 builder.Services.AddDevExpressWebAssemblyBlazorReportViewer();
diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Services/CustomImagesService.cs b/EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Services/CustomImagesService.cs
new file mode 100644
index 00000000..d75cc3f7
--- /dev/null
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Services/CustomImagesService.cs
@@ -0,0 +1,55 @@
+using System.Net.Http.Json;
+using System.Text.Json;
+
+namespace EnvelopeGenerator.Server.Client.Services;
+
+/// <summary>
+/// Fetches and caches the CustomImages configuration (signFLOW + company logos)
+/// from GET /api/CustomImages.
+///
+/// Config changes rarely (deployment-time only), so results are cached in-memory
+/// for the lifetime of the service (WASM app session). No TTL needed.
+/// </summary>
+public class CustomImagesService(IHttpClientFactory clientFactory)
+{
+    private static readonly JsonSerializerOptions _json = new(JsonSerializerDefaults.Web);
+    private const string Endpoint = "/api/CustomImages";
+
+    private CustomImagesDto? _cached;
+
+    /// <summary>
+    /// Returns logo configuration. Fetches once from server; all subsequent calls
+    /// are served from memory with zero network overhead.
+    /// Returns defaults (empty Src) on auth failure (401) — components must handle gracefully.
+    /// </summary>
+    public async Task<CustomImagesDto> GetAsync(CancellationToken ct = default)
+    {
+        if (_cached is not null)
+            return _cached;
+
+        try
+        {
+            var client = clientFactory.CreateClient("EnvelopeGenerator.Server");
+            var response = await client.GetAsync(Endpoint, ct);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                // Not authenticated yet (login page) — return defaults silently.
+                _cached = new CustomImagesDto();
+                return _cached;
+            }
+
+            _cached = await response.Content.ReadFromJsonAsync<CustomImagesDto>(_json, ct)
+                      ?? new CustomImagesDto();
+            return _cached;
+        }
+        catch (Exception)
+        {
+            // Network error or server unavailable — return defaults so UI still renders.
+            return new CustomImagesDto();
+        }
+    }
+
+    /// <summary>Call after logout to force re-fetch on next login.</summary>
+    public void Invalidate() => _cached = null;
+}