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ASP CODE

ASP File Explorer
By: Adrian Forbes
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  • Rating: 4 stars4 stars4 stars4 stars4 stars / 118
    2003-05-27

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    This script does one of two things. First it lets the user browse the file structure of any directory on the web server (permissions permitting of course) and lets them request any file by clicking on it. Only the directory you specified as root and its sub directories can be explored. The script won't let a user go above the directory you have specified as the root directory.The main advantage of this is that you can keep your files outside of your inetpub directory away from the control of the webserver. This means that your users can only access the files via your scripts. The actual location of the files on the disk is hidden from the user, and if they wish to request a file they can only get it via your script. This allows you to build in any access features you might want to add such as ensuring people have logged in to your website before they get any files. Or maybe you want certain users to download only certain files, or you might only want to give access to requests with certain domains in the HTTP_REFERER variable. By taking control of the file structure away from IIS and into your ASP script you gain full control over your files and who gets them. When a user clicks on a file to download it the script works out the correct MIME type so that the file behaves in exactly the same was as if they were getting it from IIS normally. ie jpg and gif files will show in the browser, zip files will prompt for a download, .doc files will embed themselves in the browser. And just like normal links users can right-click and select to save the file to their hard drive instead. Each directory is rendered as a basic HTML table. I'll leave it up to you how you decide to pretty up the interface. [bold]Browse.asp[/bold]

     <%@ Language=VBScript %><%
    option explicit
    dim sRoot
    sDirsParentobjFSOobjFolderobjFileobjSubFoldersSize
    %>
    <
    META content="Microsoft Visual Studio 6.0" name=GENERATOR><!-- AuthorAdrian Forbes --><%
    ' This is the root directory that the explorer will browse.  Make sure there is no backslash ()
    at the end.  Also make sure that show.asp has an identical sRoot variable.
    sRoot "c:webfiles"

    ' Get the directory relative to the root directory
    sDir = Request("Dir")

    Add a backslash
    sDir 
    sDir "\"

    Response.Write "<h1>" sDir "</h1>" vbCRLF

    ' Create a copy of FileSystemObject
    Set objFSO = CreateObject("Scripting.FileSystemObject")
    on error resume next
    Get a handle on the folder
    Set objFolder 
    objFSO.GetFolder(sRoot sDir)
    if 
    err.number <> 0 then
        Response
    .Write "Could not open folder"
        
    Response.End
    end 
    if
    on error goto 0

    ' We want a link to the parent folder also
    Get the full path of the parent folder
    sParent 
    objFSO.GetParentFolderName(objFolder.Path)

    ' Remove the contents of sRoot from the front.  This gives us the parent
    path relative to the root folder
    ' eg. if parent folder is "c:webfilessubfolder1subfolder2" then we just want "subfolder1subfolder2"
    sParent = mid(sParent, len(sRoot) + 1)

    Response.Write "<table border=""1"">"

    Give a link to the parent folder.  This is just a link to this page only pssing in
    ' the new folder as a parameter
    Response.Write "<tr><td colspan=3><a href=""browse.asp?dir=" & Server.URLEncode(sParent) & """>Parent folder</a></td></tr>" & vbCRLF

    Now we want to loop through the subfolders in this folder
    For Each objSubFolder In objFolder.SubFolders
        
    ' And provide a link to them
        Response.Write "<tr><td colspan=3><a href=""browse.asp?dir=" & Server.URLEncode(sDir & objSubFolder.Name) & """>" & objSubFolder.Name & "</a></td></tr>" & vbCRLF
    Next

    Now we want to loop through the files in this folder
    For Each objFile In objFolder.Files
        
    if Clng(objFile.Size) < 1024 then
            sSize 
    objFile.Size " bytes"
        
    else
            
    sSize Clng(objFile.Size 1024) & " KB"
        
    end if
        
    ' And provide a link to view them.  This is a link to show.asp passing in the directory and the file
        ' 
    as parameters
        Response
    .Write "<tr><td><a href=""show.asp?file=" server.URLEncode(objFile.Name) & "&dir=" server.URLEncode (sDir) & """>" objFile.Name "</a></td><td>" sSize "</td><td>" objFile.Type "</td></tr>" vbCRLF
    Next

    Response
    .Write "</table>"
    %>

    [bold]show.asp[/bold]

     <%@ Language=VBScript %><%
    option explicit
    dim sFile
    sRootsDirsExtobjShellobjFSOsMIMEobjStream

    ' Author: Adrian Forbes -->

    Make sure this is the same sRoot variable that is defined in browse.asp
    sRoot 
    "c:webfiles"

    ' Get the directory relative to the root folder
    sDir = Request("dir")

    Get the file we're going to show
    sFile = Request("file")

    We need to know the MIME type for the file we are about to view.  In
    ' order to get this we need to know the file's extension.
    ' We could use string functions to get the file extension but we've going
    ' to be lazy and use FileSystemObject
    set objFSO = server.CreateObject("Scripting.FileSystemObject")
    sExt = objFSO.GetExtensionName (sFile)
    set objFSO = nothing

    Now we have the extensionthe file's MIME type is held in the registry at
    HKEY_CLASSES_ROOT.<ext>Content Type
    ' Create an instance of Wscript.Shell to let us read the registry
    Set objShell = Server.CreateObject("Wscript.Shell")
    On Error Resume Next
    Get the MIME type
    sMIME 
    objShell.RegRead("HKEY_CLASSES_ROOT." sExt "Content Type")
    On Error GoTo 0
    if len(sMIME) = 0 then
        
    ' If there is no registered type then return octetstream.  This will prompt
        ' 
    the user with the "Open or Save to disk" dialogue.
        
    sMIME "application/octetstream"
    end if
    set objShell nothing

    ' Tell the browse the content type
    Response.ContentType = sMIME

    And the name of the file
    Response
    .AddHeader "Content-Disposition""filename=" sFile ";"

    ' Now we need to pipe the file to the browser, to do this we
    will use the ADODB.Stream
    Set objStream 
    Server.CreateObject("ADODB.Stream")
    objStream.Open
    ' Set the type as Binary
    objStream.Type = 1
    Load our file
    objStream
    .LoadFromFile sRoot sDir sFile

    ' And send it to the browser
    Response.BinaryWrite objStream.Read

    objStream.Close
    Set objStream = Nothing
    %>


    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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