last ...

Constants/XAuthenticationScheme.cs

@@ -6,5 +6,7 @@ namespace xIdentityService.Constants {
         XToken, 
         [StringValue ("introspection")]
         XIntrospection,
+        [StringValue("XApiKey")]
+        XApiKey,
     }
 }

Constants/XHeader.cs

@@ -12,5 +12,11 @@ namespace xIdentityService.Constants
         /// </summary>
         [StringValue("requestID")]
         ConnectionId,
+        
+        /// <summary>
+        /// Api Key Header Key ...
+        /// </summary>
+        [StringValue("X-Api-Key")]
+        ApiKey,
     }
 }

Extensions/XRequestExtensions.cs

@@ -0,0 +1,34 @@
+using xCommons.Extensions;
+using Microsoft.AspNetCore.Http;
+using xIdentityService.Constants;
+
+namespace xIdentityService.Extensions
+{
+    public static class XRequestExtensions
+    {
+        /// <summary>
+        /// Extract ApiKey from Request Headers ...
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static string ExtractApiKey(HttpRequest source)
+        {
+            //
+            var key = XHeader.ApiKey.GetStringValue();
+            var result = source?.Headers?[key] ?? string.Empty;
+            return result;
+        }
+
+        /// <summary>
+        /// Extract Client Id of Specified Request ....
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static string ExtractClientIP(HttpRequest source)
+        {
+            //
+            var result = source?.HttpContext.Connection.RemoteIpAddress?.ToString();
+            return result;
+        }
+    }
+}