Yakup KALEBAŞI

private string GetRequestIP(bool tryUseXForwardHeader = true)
    {
        string ip = null;

        if (tryUseXForwardHeader)
            ip = GetHeaderValueAs<string>("X-Forwarded-For").SplitCsv().LastOrDefault();

        if (ip.IsNullOrWhitespace() && _accessor.HttpContext?.Connection?.RemoteIpAddress != null)
            ip = _accessor.HttpContext.Connection.RemoteIpAddress.ToString();

        if (ip.IsNullOrWhitespace())
            ip = GetHeaderValueAs<string>("REMOTE_ADDR");

        if (ip.IsNullOrWhitespace())
            throw new Exception("Unable to determine caller's IP.");

        return ip;
    }

    public T GetHeaderValueAs<T>(string headerName)
    {
        StringValues values;

        if (_accessor.HttpContext?.Request?.Headers?.TryGetValue(headerName, out values) ?? false)
        {
            string rawValues = values.ToString();   // writes out as Csv when there are multiple

            if (!rawValues.IsNullOrWhitespace())
                return (T)Convert.ChangeType(values.ToString(), typeof(T));
        }
        return default(T);
    }

    public static List<string> SplitCsv(this string csvList, bool nullOrWhitespaceInputReturnsNull = false)
    {
        if (string.IsNullOrWhiteSpace(csvList))
            return nullOrWhitespaceInputReturnsNull ? null : new List<string>()

        return csvList
            .TrimEnd(',')
            .Split(',')
            .AsEnumerable<string>()
            .Select(s => s.Trim())
            .ToList();
    }

    public static bool IsNullOrWhitespace(this string s)
    {
        return String.IsNullOrWhiteSpace(s);
    }

    //Startup.cs
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllers();

        services.Configure<ForwardedHeadersOptions>(options =>
        {
            options.ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto;

            options.KnownNetworks.Clear(); //Not: Bu ve altta ki satırdaki kodları tekrar web üzerinden ne amaçla olduğunu öğrenmekte yarar var.

            options.KnownProxies.Clear();
        });
    }


    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        app.UseForwardedHeaders();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        })
    }

private string GetClientIp()
{
  string ip = "";

  if (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
  {
      ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
      if (!string.IsNullOrEmpty(ip))
      {
          string[] ipRange = ip.Split(",".ToCharArray());
          ip = ipRange[0];
      }
  }

  if (string.IsNullOrEmpty(ip))
  {
      if (HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"] != null)
          ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
  }

  return ip.Trim();
}