ASP防盜鏈對(duì)于廣告做網(wǎng)站的朋友來(lái)說(shuō)一直是個(gè)頭疼的問(wèn)題,盜鏈嚴(yán)重影響了服務(wù)器及網(wǎng)站的正常運(yùn)行,放盜鏈變的十分需要了,今天一起來(lái)看看一個(gè)ASP防盜鏈的實(shí)現(xiàn)方法吧。
如果我們知道一個(gè)靜態(tài)文件的實(shí)際路徑如:http://www.xx.com/download/webjx.pdf,如果服務(wù)器沒(méi)有作特別的限制設(shè)置,我們就可以毫不費(fèi)力的把它下載下來(lái)!當(dāng)網(wǎng)站提供webjx.pdf下載時(shí),怎么樣才能讓下載者無(wú)法得到他的實(shí)際路徑呢!本文就來(lái)介紹如何使用Asp來(lái)隱藏文件的實(shí)際下載路徑。
我們?cè)诠芾砭W(wǎng)站文件時(shí),可以把擴(kuò)展名一樣的文件放在同一個(gè)目錄下,起一個(gè)比較特別名字,例如放pdf文件目錄為the_pdf_file_s,把下面代碼另存為down.asp,他的網(wǎng)上路徑為http://www.xx.com/down.asp,我們就可以用http://www.xx.com/down.asp?FileName=webjx.pdf來(lái)下載這個(gè)文件了,而且下載者無(wú)法看到這個(gè)文件實(shí)際下載路徑的!在down.asp中我們還可以設(shè)置下載文件是否需要登陸,判斷下載的來(lái)源頁(yè)是否為外部網(wǎng)站,從而可以做到防止文件被盜鏈。
<%
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 "非法鏈接!" ''防止盜鏈
response.end
end if
if Request.Cookies("Logined")="" then
response.redirect "/login.asp" ''需要登陸!
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 "無(wú)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/*" ''對(duì)圖像文件不出現(xiàn)下載對(duì)話框
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 ''設(shè)置pdf類型文件目錄
TrueFileName = "/the_pdf_file_s/"&FileName
end if
if lcase(right(FileName,3))="doc" then ''設(shè)置DOC類型文件目錄
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 ''設(shè)置圖像文件目錄
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
%>
該文章在 2011/2/15 23:48:22 編輯過(guò)