asp 判斷上傳文件中是否存在危險代碼

%
function CheckFileContent(FileName)
dim ClientFile,ClientText,ClientContent,DangerString,DSArray,AttackFlag,k
set ClientFile=Server.CreateObject("Scripting.FileSystemObject")
set ClientText=ClientFile.OpenTextFile(Server.MapPath(FileName),1)
ClientContent=LCase(ClientText.ReadAll)
set ClientText=nothing
set ClientFile=nothing
AttackFlag=false
DangerString=".getfolder|.createfolder|.deletefolder|.createdirectory|.deletedirectory|.saveas|wscript.shell|script.encode|server.|.createobject|execute|activexobject|language=|include|filesystemobject|shell.application"
DSArray=split(DangerString,"|")

for k=0 to UBound(DSArray)

if InStr(ClientContent,DSArray(k))>0 then '判斷文件內(nèi)容中是否包含有危險的操作字符，如有，則必須刪除該文件。
AttackFlag=true
exit for
end if

next

CheckFileContent=AttackFlag
end function

If CheckFileContent("0.jpg")=true then
Response.Write "危險"
else
Response.Write "安全"
end if
%>