feat: Erweiterungsmethoden zum Extrahieren von Benutzerdetails in ControllerExtensions hinzugefügt

- Methoden implementiert, um Benutzer-ID, Benutzernamen, Nachnamen, Vornamen und E-Mail aus den Claims zu extrahieren
- Null-Überprüfungen und Parsing-Logik bereitgestellt, um eine gültige Extraktion sicherzustellen

WorkFlow.API/Controllers/ControllerExtensions.cs

@@ -0,0 +1,94 @@
+using Microsoft.AspNetCore.Mvc;
+using System.Security.Claims;
+
+namespace WorkFlow.API.Controllers
+{
+    public static class ControllerExtensions
+    {
+        public static bool? TryGetUserId(this ControllerBase controller, out int id)
+        {
+            var value = controller.User.FindFirstValue(ClaimTypes.NameIdentifier);
+
+            if (value is null)
+            {
+                id = default;
+                return false;
+            }
+
+            if(int.TryParse(value, out int id_int))
+            {
+                id = id_int;
+                return true;
+            }
+            else
+            {
+                id = default;
+                return false;
+            }
+        }
+
+        public static bool TryGetUsername(this ControllerBase controller, out string username)
+        {
+            var value = controller.User.FindFirstValue(ClaimTypes.Name);
+
+            if (value is null)
+            {
+                username = string.Empty;
+                return false;
+            }
+            else
+            {
+                username = value;
+                return true;
+            }
+        }
+
+        public static bool TryGetName(this ControllerBase controller, out string name)
+        {
+            var value = controller.User.FindFirstValue(ClaimTypes.Surname);
+
+            if (value is null)
+            {
+                name = string.Empty;
+                return false;
+            }
+            else
+            {
+                name = value;
+                return true;
+            }
+        }
+
+        public static bool TryGetPrename(this ControllerBase controller, out string prename)
+        {
+            var value = controller.User.FindFirstValue(ClaimTypes.GivenName);
+
+            if (value is null)
+            {
+                prename = string.Empty;
+                return false;
+            }
+            else
+            {
+                prename = value;
+                return true;
+            }
+        }
+
+        public static bool TryGetEmail(this ControllerBase controller, out string email)
+        {
+            var value = controller.User.FindFirstValue(ClaimTypes.Email);
+
+            if (value is null)
+            {
+                email = string.Empty;
+                return false;
+            }
+            else
+            {
+                email = value;
+                return true;
+            }
+        }
+    }
+}