server/AyaNova/util/IsLocalExtension.cs

@@ -0,0 +1,31 @@
+using System.Net;
+using Microsoft.AspNetCore.Http;
+
+  
+//https://stackoverflow.com/a/41242493/8939
+public static class IsLocalExtension
+{
+  
+    private const string NullIpAddress = "::1";
+
+    public static bool IsLocal(this HttpRequest req)
+    {
+        var connection = req.HttpContext.Connection;
+        if (connection.RemoteIpAddress.IsSet())
+        {
+            //We have a remote address set up
+            return connection.LocalIpAddress.IsSet() 
+                  //Is local is same as remote, then we are local
+                ? connection.RemoteIpAddress.Equals(connection.LocalIpAddress) 
+                  //else we are remote if the remote IP address is not a loopback address
+                : IPAddress.IsLoopback(connection.RemoteIpAddress);
+        }
+
+        return true;
+    }
+
+    private static bool IsSet(this IPAddress address)
+    {
+        return address != null && address.ToString() != NullIpAddress;
+    }    
+}