對於大中型網站，為了增強用戶體驗，往往需要根據不同城市站點的用戶推送或展現相應個性化的內容，如對於一些大型門戶網站的新聞會有城市站點的功能，如果沒有設置相應的城市站點，默認就是根據用戶訪問的IP地址的所在城市自動設置。本文主要通過自定義擴展IHttpModule接口，考慮到性能IP數據庫主要采用QQwry純真IP數據庫，主要實現根據IP地址或地址段或IP所在城市進行自動跳轉到指定頁面的功能(支持Nginx作為前端反向代理服務器），該WebsiteSkip組件核心代碼如下：
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Xml;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;
using NetOpen_System.Component.QQWry;
namespace NetOpen_System.Component
{
public sealed class WebsiteSkipHttpModule : IHttpModule
{
#region IHttpModule 成員
public void Dispose()
{
}
public void Init(HttpApplication context)
{
context.BeginRequest += new EventHandler(context_BeginRequest);
}
#endregion
void context_BeginRequest(object sender, EventArgs e)
{
try
{
//if (HttpContext.Current.Request.IsLocal)//忽略本地計算機請求
// return;
//string ip = HttpContext.Current.Request.UserHostAddress;
//string ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
string ip = string.Empty;
if (HttpContext.Current.Request.ServerVariables["HTTP_X_REAL_IP"] != null)
{
ip = HttpContext.Current.Request.ServerVariables["HTTP_X_REAL_IP"].ToString();
}
else if (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)
{
ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
}
else if (HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)
{
ip = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
}
else
{
ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
}
QQWryLocator qqWry = new QQWryLocator(HttpContext.Current.Server.MapPath(@"~\IpData\qqwry.dat"));
IPLocation ipaddress = qqWry.Query(ip); //查詢一個IP地址
string ls_city = ipaddress.Country;
string ls_urlfrom = string.Empty;
string ls_urlto = string.Empty;
string ls_url = HttpContext.Current.Request.Url.AbsoluteUri;
string ls_useragentkeyword = string.Empty;
ExcludeUserAgentMatchEngine Em = WebsiteSkipConfiguration.GetConfig().ExcludeUserAgents;
if(Em.ExcludeUserAgentList.Count > 0)
{
foreach (ExcludeUserAgent ua in Em.ExcludeUserAgentList)
{
if (HttpContext.Current.Request.UserAgent.Contains(ua.keyword))
{
return;
}
}
}
UrlMatchEngine pu = WebsiteSkipConfiguration.GetConfig().SkipedUrls;
if (pu.UrlList.Count > 0)
{
foreach (SkipedUrl sk in pu.UrlList)
{
if (ls_city.Contains(sk.IpCity))
{
if (sk.UrlFrom.Length > 0)
{
if (sk.UrlFrom.Contains(ls_url) && !ls_url.Contains(sk.OutKeyWord))
{
if (sk.UrlTo.Length > 0)
{
HttpContext.Current.Response.Redirect(sk.UrlTo, true);
}
break;
}
}
break;
}
}
}
if (WebsiteSkipConfiguration.GetConfig().IpChecks.GetIpIn(ip))
{
ls_urlfrom = WebsiteSkipConfiguration.GetConfig().IpChecks.UrlFrom.Trim();
ls_urlto = WebsiteSkipConfiguration.GetConfig().IpChecks.UrlTo.Trim();
if (ls_urlfrom.Length > 0)
{
if (ls_urlfrom.Contains(ls_url) && !ls_url.Contains(WebsiteSkipConfiguration.GetConfig().IpChecks.OutKeyWord))
{
if (ls_urlto.Length > 0)
{
HttpContext.Current.Response.Redirect(ls_urlto, true);
}
}
}
}
}
catch
{
}
}
}
}
在部署方面，非常簡單主要利用IHttpModule接口並在Web.config中的HttpModule節點添加此組件的配置，訪問限制或允許參數可以在NetOpen_SystemWebsiteSkip.cfg.xml進行設置，以下為一個簡單的配置示例：
復制代碼 代碼如下:
<?xml version="1.0" encoding="utf-8" ?>
<NetOpen_System>
<WebsiteSkip>
<SkipedUrl>
<add ipcity="溫州" urlfrom="http://examplesite.com/Default.aspx,http://examplesite.com/,http://examplesite.cn/,http://www.examplesite.cn" urlto="http://wz.mainwebsite.pcom/index.aspx" outkeyword="math"/>
<add ipcity="鎮江" urlfrom="http://examplesite.com/Default.aspx,http://examplesite.com/,http://examplesite.cn/,http://www.examplesite.cn" urlto="http://jszj.mainwebsite.com/index.aspx" outkeyword="math"/>
</SkipedUrl>
<SkipedIP>
<add ip1="220.186.0.0" ip2="220.186.255.255" urlfrom="http://examplesite.com/Default.aspx,http://examplesite.com/,http://examplesite.cn/,http://www.examplesite.cn" urlto="http://wz.mainwebsite.com/index.aspx" outkeyword="math"/>
</SkipedIP>
<ExcludeUserAgent>
<add keyword="Baiduspider">
<add keyword="Sosospider">
<add keyword="Sogou web spider">
<add keyword="Sogou inst spider">
<add keyword="Sogou-Test-Spider">
<add keyword="Sogou Orion spider">
<add keyword="Gigabot">
<add keyword="0JJJSpider">
<add keyword="Sogou Pic Spider">
<add keyword="Googlebot">
<add keyword="Yeti/1.0">
</ExcludeUserAgent>
</WebsiteSkip>
</WebsiteSkip>
</NetOpen_System>
