IHttpModule响应.过滤写没有关闭HTML
本文关键字:HTML 响应 过滤 IHttpModule | 更新日期: 2023-09-27 18:02:31
我写了一个自定义IHttpModule,但是当源代码中没有关闭标记时,它会导致问题。我在CMS中遇到了几个页面,我正在运行这个页面,其中.aspx页面更像是一个处理程序,并且放弃关闭html以通过ajax返回给用户响应。
来源:
public class HideModule : IHttpModule
{
public void Dispose()
{
//Empty
}
public void Init(HttpApplication app)
{
app.ReleaseRequestState += new EventHandler(InstallResponseFilter);
}
// ---------------------------------------------
private void InstallResponseFilter(object sender, EventArgs e)
{
HttpResponse response = HttpContext.Current.Response;
string filePath = HttpContext.Current.Request.FilePath;
string fileExtension = VirtualPathUtility.GetExtension(filePath);
if (response.ContentType == "text/html" && fileExtension.ToLower() == ".aspx")
response.Filter = new PageFilter(response.Filter);
}
}
public class PageFilter : Stream
{
Stream responseStream;
long position;
StringBuilder responseHtml;
public PageFilter (Stream inputStream)
{
responseStream = inputStream;
responseHtml = new StringBuilder ();
}
//Other overrides here
public override void Write(byte[] buffer, int offset, int count)
{
string strBuffer = System.Text.UTF8Encoding.UTF8.GetString (buffer, offset, count);
Regex eof = new Regex ("</html>", RegexOptions.IgnoreCase);
if (!eof.IsMatch (strBuffer))
{
responseHtml.Append (strBuffer);
}
else
{
responseHtml.Append (strBuffer);
string finalHtml = responseHtml.ToString();
//Do replace here
byte[] data = System.Text.UTF8Encoding.UTF8.GetBytes(finalHtml);
responseStream.Write(data, 0, data.Length);
}
}
#endregion
}
正如您所看到的,这很好,因为它只在最后一次调用Write时进行替换,但是如果输出没有结束HTML标记,那么
如果没有找到关闭html,我最好的选择是甚至不添加新的过滤器。但我觉得我没办法这么早截住全部消息。失败是有另一种方法来检测写是在流的末尾除了寻找关闭html标签?
如果是WebForms,你应该能够在你的InstallResponseFilter函数中做这样的事情:
if(Application.Context.CurrentHandler is System.Web.UI.Page
&& Application.Request["HTTP_X_MICROSOFTAJAX"] == null
&& Application.Request.Params["_TSM_CombinedScripts_"] == null)
{
response.Filter=new PageFilter(response.Filter);
}