A lot

KTUSAPS/Extensions/ClaimsPrincipalExtensions.cs

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+using System.Linq;
+using System.Security.Claims;
+
+namespace KTUSAPS.Extensions
+{
+    public static class ClaimsPrincipalExtensions
+    {
+        private static string getClaimValue(ClaimsPrincipal claimsPrincipal, string claimType)
+        {
+            return claimsPrincipal.Claims.FirstOrDefault(c => c.Type == claimType)?.Value;
+        }
+
+        public static string GetUserId(this ClaimsPrincipal claimsPrincipal)
+        {
+            if (claimsPrincipal == null)
+                return null;
+            return getClaimValue(claimsPrincipal, ClaimTypes.NameIdentifier);
+        }
+
+        public static string GetName(this ClaimsPrincipal claimsPrincipal)
+        {
+            if (claimsPrincipal == null)
+                return null;
+            return getClaimValue(claimsPrincipal, "name");
+        }
+
+        public static string GetEmail(this ClaimsPrincipal claimsPrincipal)
+        {
+            if (claimsPrincipal == null)
+                return null;
+            return getClaimValue(claimsPrincipal, ClaimTypes.Email);
+        }
+
+        public static string GetObjectId(this ClaimsPrincipal claimsPrincipal)
+        {
+            if (claimsPrincipal == null)
+                return null;
+            return getClaimValue(claimsPrincipal, "http://schemas.microsoft.com/identity/claims/objectidentifier");
+        }
+    }
+}