XS202402219015/ProjectManagementSystem.WebApi/Extensions/HttpRequestMessageExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ProjectManagementSystem.WebApi.Extensions
{

    public static class HttpRequestMessageExtensions
    {
        private const string HttpContext = "MS_HttpContext";
        private const string RemoteEndpointMessage = "System.ServiceModel.Channels.RemoteEndpointMessageProperty";
        private const string OwinContext = "MS_OwinContext";

        public static string GetClientIpAddress(this System.Net.Http.HttpRequestMessage request)
        {
            // Self-hosting. Needs reference to System.ServiceModel.dll. 
            if (request.Properties.TryGetValue(RemoteEndpointMessage, out dynamic remoteEndpoint))
            {
                if (remoteEndpoint != null)
                {
                    return remoteEndpoint.Address;
                }
            }

            // Self-hosting using Owin. Needs reference to Microsoft.Owin.dll. 
            if (request.Properties.TryGetValue(OwinContext, out dynamic owinContext))
            {
                if (owinContext != null)
                {
                    return owinContext.Request.RemoteIpAddress;
                }
            }

            // Web-hosting. Needs reference to System.Web.dll
            if (request.Properties.TryGetValue(HttpContext, out dynamic ctx))
            {
                if (ctx != null)
                {
                    return ctx.Request.UserHostAddress;
                }
            }

            return null;
        }
    }
}