feat: Refaktorierung von ClientEvents zur Verwendung eines Delegaten für öffentliche Schlüsselaktualisierungen

- Ersetzt `Action<string, string, string, ILogger?>` durch den `ClientEvent`-Delegaten für eine bessere Struktur.
- `ClientEvent`-Delegaten mit `AuthClient`-Referenz eingeführt, um öffentliche Schlüssel direkt zu aktualisieren.

DigitalData.Auth.Client/AuthClient.cs

@@ -57,7 +57,7 @@ public class AuthClient : IAuthClient, IAsyncDisposable
         }
     }
 
-    public Task ReceivePublicKeyAsync(string issuer, string audience, string message) => Task.Run(() => _params.Events.OnMessageReceived(issuer, audience, message, _logger));
+    public Task ReceivePublicKeyAsync(string issuer, string audience, string message) => Task.Run(() => _params.TriggerOnMessageReceived(this, issuer, audience, message, _logger));
 
     public Task SendPublicKeyAsync(string issuer, string audience, string message) => _connection.InvokeAsync(nameof(SendPublicKeyAsync), issuer, audience, message);
 

DigitalData.Auth.Client/ClientEvents.cs

@@ -1,10 +1,18 @@
-using Microsoft.Extensions.Logging;
+using DigitalData.Core.Abstractions.Security;
+using Microsoft.Extensions.Logging;
 
-namespace DigitalData.Auth.Client
+namespace DigitalData.Auth.Client;
+
+public delegate void ClientEvent(AuthClient client, string issuer, string audience, string content, ILogger? logger = null);
+
+public static class ClientEvents
 {
-    public class ClientEvents
+    public static readonly ClientEvent UpdatePublicKeys = (client, issuer, audience, content, logger) =>
     {
-        public Action<string, string, string, ILogger?> OnMessageReceived { get; set; } = (issuer, audience, key, logger)
-            => logger?.LogInformation("Public key value has been updated. Issuer: {Issuer}, Audience: {Audience}, New Key: {Key}", issuer, audience, key);
-    }
+        if(client.PublicKeys.TryGet(issuer, audience, out var publicKey))
+            publicKey.Content = content;
+        else
+            logger?.LogWarning(
+                "Failed to update public key: No matching key found. Issuer: {Issuer}, Audience: {Audience}. Ensure the key exists before attempting an update.", issuer, audience);
+    };
 }

DigitalData.Auth.Client/ClientParams.cs

@@ -1,5 +1,6 @@
 using DigitalData.Auth.Client;
 using Microsoft.AspNetCore.SignalR.Client;
+using Microsoft.Extensions.Logging;
 
 namespace DigitalData.Auth.Client;
 
@@ -24,7 +25,10 @@ public class ClientParams
     /// </summary>
     public TimeSpan? RetryDelay { get; set; }
 
-    public readonly ClientEvents Events = new();
+    public ClientEvent OnMessageReceived = delegate { };
+
+    internal void TriggerOnMessageReceived(AuthClient client, string issuer, string audience, string key, ILogger? logger = null)
+        => OnMessageReceived(client, issuer, audience, key, logger);
 
     public ClientParams()
     {