refactoring for integration

src/Yavsc.Api/Helpers/RequestHelpers.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+
+using Microsoft.Extensions.Logging;
+using Microsoft.AspNetCore.Http;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+using Yavsc.ViewModels;
+using Yavsc.Models;
+using System.Linq;
+
+namespace Yavsc.Api.Helpers
+{
+    public static class RequestHelpers
+    {
+        // Check for some apache proxy header, if any
+        public static string? ForwardedFor(this HttpRequest request) {
+            string? host = request.Headers["X-Forwarded-For"];
+            if (string.IsNullOrEmpty(host)) {
+                host = request.Host.Value;
+            } else { // Using X-Forwarded-For last address
+                host = host.Split(',')
+                    .Last()
+                    .Trim();
+            }
+            return host;
+        }
+    }
+}