13518219792
ASP.net中怎么利用UrlRewrite实现防盗链功能，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
配置文件：
1 username
说明：
CheckType：要求验证的类型(1：只验证合法的域名，2：只验证是否有cookies，3：同时验证域名与cookies)
CookiesName：要验证的cookies名称，可为空。
UrlPattern：请求的ＵＲＬ格式。
UrlReplace：当下载无效时转向的ＵＲＬ格式。
AllowHost：允许的来源域名。
Global.aspx中的配置：
void Application_BeginRequest(object sender, EventArgs e)
{
bool IsAllowDomain = false;
bool IsLogin = false;
string CookiesName = "UserName", AllowHost, ReferrerHost="";
int CheckType = 1;
bool AllowDown = false;
string[] AllowHostArr;
string UrlPattern = "", UrlReplace = "";
string[] pattern, replace;
string ConfigFile = ConfigurationManager.AppSettings["DownLoadConfig"];
if (ConfigFile != "")
{
try
{
System.Xml.XmlDataDocument XDConfig = new System.Xml.XmlDataDocument();
XDConfig.Load(AppDomain.CurrentDomain.BaseDirectory + @"/" + ConfigFile);
if (XDConfig.SelectSingleNode("DownLoad/CheckType").InnerText != "")
{
CheckType = int.Parse(XDConfig.SelectSingleNode("DownLoad/CheckType").InnerText);
}
if (XDConfig.SelectSingleNode("DownLoad/CookiesName").InnerText != "")
{
CookiesName = XDConfig.SelectSingleNode("DownLoad/CookiesName").InnerText;
}
AllowHost = XDConfig.SelectSingleNode("DownLoad/AllowHost ").InnerText;
AllowHostArr = AllowHost.Split('|');
UrlPattern = XDConfig.SelectSingleNode("DownLoad/UrlPattern").InnerText;
UrlReplace = XDConfig.SelectSingleNode("DownLoad/UrlReplace").InnerText;
pattern = UrlPattern.Split('@');
replace = UrlReplace.Split('@');
if (CookiesName == "") CookiesName = "UserName";
IsLogin = false.Equals(Request.Cookies[CookiesName] == null || Request.Cookies[CookiesName].Value == "");
if (Request.UrlReferrer != null) ReferrerHost = Request.UrlReferrer.Host.ToString();
if (AllowHostArr.Length < 1)
{
IsAllowDomain = true;
}
else
{
for (int HostI = 0; HostI < AllowHostArr.Length - 1; HostI++)
{
if (AllowHostArr[HostI].ToLower() == ReferrerHost.ToLower())
{
IsAllowDomain = true;
break;
}
}
}
switch (CheckType)
{
case 1:
AllowDown = true.Equals(IsAllowDomain);
break;
case 2:
AllowDown = IsLogin;
break;
case 3:
AllowDown = true.Equals(IsAllowDomain && IsLogin);
break;
}
if (AllowDown == false)
{
string oldUrl = HttpContext.Current.Request.RawUrl;
string newUrl = oldUrl;
for (int iii = 0; iii < pattern.Length; iii++)
{
if (Regex.IsMatch(oldUrl, pattern[iii], RegexOptions.IgnoreCase | RegexOptions.Compiled))
{
newUrl = Regex.Replace(oldUrl, pattern[iii], replace[iii], RegexOptions.Compiled | RegexOptions.IgnoreCase);
oldUrl = newUrl;
}
}
this.Context.RewritePath(newUrl);
}
}
catch
{
}
}
}
Web.Config中的配置：
