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Umbraco-CMS/src/Umbraco.Core/HttpContextExtensions.cs

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using System.Web;
namespace Umbraco.Core
{
public static class HttpContextExtensions
{
public static string GetCurrentRequestIpAddress(this HttpContextBase httpContext)
{
if (httpContext == null)
{
return "Unknown, httpContext is null";
}
if (httpContext.Request == null)
{
return "Unknown, httpContext.Request is null";
}
if (httpContext.Request.ServerVariables == null)
{
return "Unknown, httpContext.Request.ServerVariables is null";
}
// From: http://stackoverflow.com/a/740431/5018
try
{
var ipAddress = httpContext.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (string.IsNullOrEmpty(ipAddress))
return httpContext.Request.ServerVariables["REMOTE_ADDR"];
var addresses = ipAddress.Split(',');
if (addresses.Length != 0)
return addresses[0];
return httpContext.Request.ServerVariables["REMOTE_ADDR"];
}
catch (System.Exception ex)
{
//This try catch is to just always ensure that no matter what we're not getting any exceptions caused since
// that would cause people to not be able to login
return string.Format("Unknown, exception occurred trying to resolve IP {0}", ex);
}
}
}
}