IpFilter特性-指定IP访问

IpFilter

using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Web;
using System.Web.Http.Controllers;
using System.Web.Http.Filters;

namespace ***.Common
{
    /// <summary>
    /// 指定IP地址才能访问API
    /// </summary>
    public class IpFilter: ActionFilterAttribute
    {
        /// <summary>
        /// 在调用操作方法之前发生。
        /// </summary>
        /// <param name="actionContext"></param>
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            base.OnActionExecuting(actionContext);
            string ip = IpHelper.GetRealIP();
            if (ip ==ConfigurationManager.AppSettings["ApiUrl"])
            {
                //HttpContext.Current.Response.Write("[]");
                //创建响应对象，初始化为成功，没有指定的话本次请求将不会被拦截1**.**.1**.1**
                actionContext.Response = new HttpResponseMessage(System.Net.HttpStatusCode.OK);
            }

        }

    }
}

IpHelper

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text.RegularExpressions;
using System.Web;

namespace ***.Common
{
    /// <summary>
    /// 获取客户端IP地址
    /// </summary>
    public class IpHelper
    {
        /// <summary>  
        /// 获取真ip  
        /// </summary>  
        /// <returns></returns>  
        public static string GetRealIP()
        {
            string result = String.Empty;
            result = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            //可能有代理   
            if (!string.IsNullOrWhiteSpace(result))
            {
                //没有"." 肯定是非IP格式  
                if (result.IndexOf(".") == -1)
                {
                    result = null;
                }
                else
                {
                    //有","，估计多个代理。取第一个不是内网的IP。  
                    if (result.IndexOf(",") != -1)
                    {
                        result = result.Replace(" ", string.Empty).Replace("\"", string.Empty);

                        string[] temparyip = result.Split(",;".ToCharArray());

                        if (temparyip != null && temparyip.Length > 0)
                        {
                            for (int i = 0; i < temparyip.Length; i++)
                            {
                                //找到不是内网的地址  
                                if (IsIPAddress(temparyip[i]) && temparyip[i].Substring(0, 3) != "10." && temparyip[i].Substring(0, 7) != "192.168" && temparyip[i].Substring(0, 7) != "172.16.")
                                {
                                    return temparyip[i];
                                }
                            }
                        }
                    }
                    //代理即是IP格式  
                    else if (IsIPAddress(result))
                    {
                        return result;
                    }
                    //代理中的内容非IP  
                    else
                    {
                        result = null;
                    }
                }
            }

            if (string.IsNullOrWhiteSpace(result))
            {
                result = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            }

            if (string.IsNullOrWhiteSpace(result))
            {
                result = System.Web.HttpContext.Current.Request.UserHostAddress;
            }
            return result;
        }



        public static bool IsIPAddress(string str)
        {
            if (string.IsNullOrWhiteSpace(str) || str.Length < 7 || str.Length > 15)
                return false;

            string regformat = @"^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})";
            Regex regex = new Regex(regformat, RegexOptions.IgnoreCase);

            return regex.IsMatch(str);
        }
    }
}