日期:2008-07-25 浏览次数:20984 次
ASP防盗链对于广告做网站的朋友来说不断是个头疼的问题,盗链严重影响了服务器及网站的正常运转,放盗链变的十分需求了,今天一同来看看一个ASP防盗链的实现方法吧。
如果我们知道一个静态文件的实际路径如:http://www.xx.com/download/aiyiweb.pdf,如果服务器没有作特别的限制设置,我们就可以毫不费力的把它下载下来!当网站提供aiyiweb.pdf下载时,怎样样才能让下载者无法得到他的实际路径呢!本文就来引见如何使用Asp来隐藏文件的实际下载路径。
我们在管理网站文件时,可以把扩展名一样的文件放在同一个目录下,起一个比较特别名字,例如放pdf文件目录为the_pdf_file_s,把下面代码另存为down.asp,他的网上路径为http://www.xx.com/down.asp,我们就可以用http://www.xx.com/down.asp?FileName=aiyiweb.pdf来下载这个文件了,而且下载者无法看到这个文件实际下载路径的!在down.asp中我们还可以设置下载文件能否需求登陆,判断下载的来源页能否为外部网站,从而可以做到防止文件被盗链。
<% From_url = Cstr(Request.ServerVariables("HTTP_REFERER")) Serv_url = Cstr(Request.ServerVariables("SERVER_NAME")) if mid(From_url,8,len(Serv_url)) <> Serv_url then response.write "非法链接!" '防止盗链 response.end end if if Request.Cookies("Logined")="" then response.redirect "/login.asp" '需求登陆! end if Function GetFileName(longname)'/folder1/folder2/file.asp=>file.asp while instr(longname,"/") longname = right(longname,len(longname)-1) wend GetFileName = longname End Function Dim Stream Dim Contents Dim FileName Dim TrueFileName Dim FileExt Const adTypeBinary = 1 FileName = Request.QueryString("FileName") if FileName = "" Then Response.Write "无效文件名!" Response.End End if FileExt = Mid(FileName, InStrRev(FileName, ".") + 1) select Case UCase(FileExt) Case "ASP", "ASA", "ASPX", "ASAX", "MDB" Response.Write "非法操作!" Response.End End select Response.Clear if lcase(right(FileName,3))="gif" or lcase(right(FileName,3))="jpg" or lcase(right(FileName,3))="png" then Response.ContentType = "image/*" '对图像文件不出现下载对话框 else Response.ContentType = "application/ms-download" end if Response.AddHeader "content-disposition", "attachment; filename=" & GetFileName(Request.QueryString("FileName")) Set Stream = server.createObject("ADODB.Stream") Stream.Type = adTypeBinary Stream.Open if lcase(right(FileName,3))="pdf" then '设置pdf类型文件目录 TrueFileName = "/the_pdf_file_s/"&FileName end if if lcase(right(FileName,3))="doc" then '设置DOC类型文件目录 TrueFileName = "/my_D_O_C_file/"&FileName end if if lcase(right(FileName,3))="gif" or lcase(right(FileName,3))="jpg" or lcase(right(FileName,3))="png" then TrueFileName = "/all_images_/"&FileName '设置图像文件目录 end if Stream.LoadFromFile Server.MapPath(TrueFileName) While Not Stream.EOS Response.BinaryWrite Stream.Read(1024 * 64) Wend Stream.Close Set Stream = Nothing Response.Flush Response.End %> |