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07.01.2008 at 03:23PM PDT, ID: 23531921
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8.8

Using FreeASPUpload code, how can I restrict what type of files can be uploaded?

Asked by CLSTEAM in Active Server Pages (ASP)

Tags:

I use the freely available FreeASPUpload code to allow users to upload files to the web server.  Now, I need to modify the code so that only certain file types can be uploaded.  More specifically, only DOC, PDF or XLS files should be allowed to be uploaded.  Thanks in advanced for any replies.

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THIS IS THE HTML:
 
<%@ Language=VBScript %>
<% 
option explicit 
Response.Expires = -1
Server.ScriptTimeout = 600
%>
<!-- #include file="freeaspupload.asp" -->
<%
 
 
' ****************************************************
' Change the value of the variable below to the pathname
' of a directory with write permissions, for example "C:\Inetpub\wwwroot"
  Dim uploadsDirVar
  uploadsDirVar = "c:\inetpub\wwwroot\employees\formstest" 
' ****************************************************
 
' Note: this file uploadTester.asp is just an example to demonstrate
' the capabilities of the freeASPUpload.asp class. There are no plans
' to add any new features to uploadTester.asp itself. Feel free to add
' your own code. If you are building a content management system, you
' may also want to consider this script: http://www.webfilebrowser.com/
 
function OutputForm()
%>
    <form name="frmSend" method="POST" enctype="multipart/form-data" action="uploadTester.asp" onSubmit="return onSubmitForm();">
	<B>File names:</B><br>
    File 1: <input name="attach1" type="file" size=35><br>
    File 2: <input name="attach2" type="file" size=35><br>
    File 3: <input name="attach3" type="file" size=35><br>
    File 4: <input name="attach4" type="file" size=35><br>
    <br> 
	<!-- These input elements are obviously optional and just included here for demonstration purposes -->
	<B>Additional fields (demo):</B><br>
	Enter a number: <input type="text" name="enter_a_number"><br>
    Checkbox values: <input type="checkbox" value="1" name="checkbox_values">-1 <input type="checkbox" value="2" name="checkbox_values">-2<br>
	<!-- End of additional elements -->
    <input style="margin-top:4" type=submit value="Upload">
    </form>
<%
end function
 
function TestEnvironment()
    Dim fso, fileName, testFile, streamTest
    TestEnvironment = ""
    Set fso = Server.CreateObject("Scripting.FileSystemObject")
    if not fso.FolderExists(uploadsDirVar) then
        TestEnvironment = "<B>Folder " & uploadsDirVar & " does not exist.</B><br>The value of your uploadsDirVar is incorrect. Open uploadTester.asp in an editor and change the value of uploadsDirVar to the pathname of a directory with write permissions."
        exit function
    end if
    fileName = uploadsDirVar & "\test.txt"
    on error resume next
    Set testFile = fso.CreateTextFile(fileName, true)
    If Err.Number<>0 then
        TestEnvironment = "<B>Folder " & uploadsDirVar & " does not have write permissions.</B><br>The value of your uploadsDirVar is incorrect. Open uploadTester.asp in an editor and change the value of uploadsDirVar to the pathname of a directory with write permissions."
        exit function
    end if
    Err.Clear
    testFile.Close
    fso.DeleteFile(fileName)
    If Err.Number<>0 then
        TestEnvironment = "<B>Folder " & uploadsDirVar & " does not have delete permissions</B>, although it does have write permissions.<br>Change the permissions for IUSR_<I>computername</I> on this folder."
        exit function
    end if
    Err.Clear
    Set streamTest = Server.CreateObject("ADODB.Stream")
    If Err.Number<>0 then
        TestEnvironment = "<B>The ADODB object <I>Stream</I> is not available in your server.</B><br>Check the Requirements page for information about upgrading your ADODB libraries."
        exit function
    end if
    Set streamTest = Nothing
end function
 
function SaveFiles
    Dim Upload, fileName, fileSize, ks, i, fileKey
 
    Set Upload = New FreeASPUpload
    Upload.Save(uploadsDirVar)
 
	' If something fails inside the script, but the exception is handled
	If Err.Number<>0 then Exit function
 
    SaveFiles = ""
    ks = Upload.UploadedFiles.keys
    if (UBound(ks) <> -1) then
        SaveFiles = "<B>Files uploaded:</B> "
        for each fileKey in Upload.UploadedFiles.keys
            SaveFiles = SaveFiles & Upload.UploadedFiles(fileKey).FileName & " (" & Upload.UploadedFiles(fileKey).Length & "B) "
        next
    else
        SaveFiles = "The file name specified in the upload form does not correspond to a valid file in the system."
    end if
	SaveFiles = SaveFiles & "<br>Enter a number = " & Upload.Form("enter_a_number") & "<br>"
	SaveFiles = SaveFiles & "Checkbox values = " & Upload.Form("checkbox_values") & "<br>"
end function
%>
 
<HTML>
<HEAD>
<TITLE>Test Free ASP Upload</TITLE>
<style>
BODY {background-color: white;font-family:arial; font-size:12}
</style>
<script>
function onSubmitForm() {
    var formDOMObj = document.frmSend;
    if (formDOMObj.attach1.value == "" && formDOMObj.attach2.value == "" && formDOMObj.attach3.value == "" && formDOMObj.attach4.value == "" )
        alert("Please press the browse button and pick a file.")
    else
        return true;
    return false;
}
</script>
 
</HEAD>
 
<BODY>
 
<br><br>
<%
Dim diagnostics
if Request.ServerVariables("REQUEST_METHOD") <> "POST" then
    diagnostics = TestEnvironment()
    if diagnostics<>"" then
        response.write "<div style=""margin-left:20; margin-top:30; margin-right:30; margin-bottom:30;"">"
        response.write diagnostics
        response.write "<p>After you correct this problem, reload the page."
        response.write "</div>"
    else
        response.write "<div style=""margin-left:150"">"
        OutputForm()
        response.write "</div>"
    end if
else
    response.write "<div style=""margin-left:150"">"
    OutputForm()
    response.write SaveFiles()
    response.write "<br><br></div>"
end if
 
%>
 
<!-- Please support this free script by having a link to freeaspupload.net either in this page or somewhere else in your site. -->
<br>
<!-- end of html to remove ------------------------->
</BODY>
</HTML>
 
 
-------------------------------------------------------------------------------------------------------------------
THIS IS THE ATTACHED freeaspupload.asp
 
<%
'  For examples, documentation, and your own free copy, go to:
'  http://www.freeaspupload.net
'  Note: You can copy and use this script for free and you can make changes
'  to the code, but you cannot remove the above comment.
 
'Changes:
'Aug 2, 2005: Add support for checkboxes and other input elements with multiple values
 
Class FreeASPUpload
	Public UploadedFiles
	Public FormElements
 
	Private VarArrayBinRequest
	Private StreamRequest
	Private uploadedYet
 
	Private Sub Class_Initialize()
		Set UploadedFiles = Server.CreateObject("Scripting.Dictionary")
		Set FormElements = Server.CreateObject("Scripting.Dictionary")
		Set StreamRequest = Server.CreateObject("ADODB.Stream")
		StreamRequest.Type = 1 'adTypeBinary
		StreamRequest.Open
		uploadedYet = false
	End Sub
	
	Private Sub Class_Terminate()
		If IsObject(UploadedFiles) Then
			UploadedFiles.RemoveAll()
			Set UploadedFiles = Nothing
		End If
		If IsObject(FormElements) Then
			FormElements.RemoveAll()
			Set FormElements = Nothing
		End If
		StreamRequest.Close
		Set StreamRequest = Nothing
	End Sub
 
	Public Property Get Form(sIndex)
		Form = ""
		If FormElements.Exists(LCase(sIndex)) Then Form = FormElements.Item(LCase(sIndex))
	End Property
 
	Public Property Get Files()
		Files = UploadedFiles.Items
	End Property
 
	'Calls Upload to extract the data from the binary request and then saves the uploaded files
	Public Sub Save(path)
		Dim streamFile, fileItem
 
		if Right(path, 1) <> "\" then path = path & "\"
 
		if not uploadedYet then Upload
 
		For Each fileItem In UploadedFiles.Items
			Set streamFile = Server.CreateObject("ADODB.Stream")
			streamFile.Type = 1
			streamFile.Open
			StreamRequest.Position=fileItem.Start
			StreamRequest.CopyTo streamFile, fileItem.Length
			streamFile.SaveToFile path & fileItem.FileName, 2
			streamFile.close
			Set streamFile = Nothing
			fileItem.Path = path & fileItem.FileName
		 Next
	End Sub
 
	Public Function SaveBinRequest(path) ' For debugging purposes
		StreamRequest.SaveToFile path & "\debugStream.bin", 2
	End Function
 
	Public Sub DumpData() 'only works if files are plain text
		Dim i, aKeys, f
		response.write "Form Items:<br>"
		aKeys = FormElements.Keys
		For i = 0 To FormElements.Count -1 ' Iterate the array
			response.write aKeys(i) & " = " & FormElements.Item(aKeys(i)) & "<BR>"
		Next
		response.write "Uploaded Files:<br>"
		For Each f In UploadedFiles.Items
			response.write "Name: " & f.FileName & "<br>"
			response.write "Type: " & f.ContentType & "<br>"
			response.write "Start: " & f.Start & "<br>"
			response.write "Size: " & f.Length & "<br>"
		 Next
   	End Sub
 
	Private Sub Upload()
		Dim nCurPos, nDataBoundPos, nLastSepPos
		Dim nPosFile, nPosBound
		Dim sFieldName, osPathSep, auxStr
 
		'RFC1867 Tokens
		Dim vDataSep
		Dim tNewLine, tDoubleQuotes, tTerm, tFilename, tName, tContentDisp, tContentType
		tNewLine = Byte2String(Chr(13))
		tDoubleQuotes = Byte2String(Chr(34))
		tTerm = Byte2String("--")
		tFilename = Byte2String("filename=""")
		tName = Byte2String("name=""")
		tContentDisp = Byte2String("Content-Disposition")
		tContentType = Byte2String("Content-Type:")
 
		uploadedYet = true
 
		on error resume next
		VarArrayBinRequest = Request.BinaryRead(Request.TotalBytes)
		if Err.Number <> 0 then 
			response.write "<br><br><B>System reported this error:</B><p>"
			response.write Err.Description & "<p>"
			response.write "The most likely cause for this error is the incorrect setup of AspMaxRequestEntityAllowed in IIS MetaBase. Please see instructions in the <A HREF='http://www.freeaspupload.net/freeaspupload/requirements.asp'>requirements page of freeaspupload.net</A>.<p>"
			Exit Sub
		end if
		on error goto 0 'reset error handling
 
		nCurPos = FindToken(tNewLine,1) 'Note: nCurPos is 1-based (and so is InstrB, MidB, etc)
 
		If nCurPos <= 1  Then Exit Sub
		 
		'vDataSep is a separator like -----------------------------21763138716045
		vDataSep = MidB(VarArrayBinRequest, 1, nCurPos-1)
 
		'Start of current separator
		nDataBoundPos = 1
 
		'Beginning of last line
		nLastSepPos = FindToken(vDataSep & tTerm, 1)
 
		Do Until nDataBoundPos = nLastSepPos
			
			nCurPos = SkipToken(tContentDisp, nDataBoundPos)
			nCurPos = SkipToken(tName, nCurPos)
			sFieldName = ExtractField(tDoubleQuotes, nCurPos)
 
			nPosFile = FindToken(tFilename, nCurPos)
			nPosBound = FindToken(vDataSep, nCurPos)
			
			If nPosFile <> 0 And  nPosFile < nPosBound Then
				Dim oUploadFile
				Set oUploadFile = New UploadedFile
				
				nCurPos = SkipToken(tFilename, nCurPos)
				auxStr = ExtractField(tDoubleQuotes, nCurPos)
                ' We are interested only in the name of the file, not the whole path
                ' Path separator is \ in windows, / in UNIX
                ' While IE seems to put the whole pathname in the stream, Mozilla seem to 
                ' only put the actual file name, so UNIX paths may be rare. But not impossible.
                osPathSep = "\"
                if InStr(auxStr, osPathSep) = 0 then osPathSep = "/"
				oUploadFile.FileName = Right(auxStr, Len(auxStr)-InStrRev(auxStr, osPathSep))
 
				if (Len(oUploadFile.FileName) > 0) then 'File field not left empty
					nCurPos = SkipToken(tContentType, nCurPos)
					
                    auxStr = ExtractField(tNewLine, nCurPos)
                    ' NN on UNIX puts things like this in the streaa:
                    '    ?? python py type=?? python application/x-python
					oUploadFile.ContentType = Right(auxStr, Len(auxStr)-InStrRev(auxStr, " "))
					nCurPos = FindToken(tNewLine, nCurPos) + 4 'skip empty line
					
					oUploadFile.Start = nCurPos-1
					oUploadFile.Length = FindToken(vDataSep, nCurPos) - 2 - nCurPos
					
					If oUploadFile.Length > 0 Then UploadedFiles.Add LCase(sFieldName), oUploadFile
				End If
			Else
				Dim nEndOfData
				nCurPos = FindToken(tNewLine, nCurPos) + 4 'skip empty line
				nEndOfData = FindToken(vDataSep, nCurPos) - 2
				If Not FormElements.Exists(LCase(sFieldName)) Then 
					FormElements.Add LCase(sFieldName), String2Byte(MidB(VarArrayBinRequest, nCurPos, nEndOfData-nCurPos))
				else
                    FormElements.Item(LCase(sFieldName))= FormElements.Item(LCase(sFieldName)) & ", " & String2Byte(MidB(VarArrayBinRequest, nCurPos, nEndOfData-nCurPos)) 
                end if 
 
			End If
 
			'Advance to next separator
			nDataBoundPos = FindToken(vDataSep, nCurPos)
		Loop
		StreamRequest.Write(VarArrayBinRequest)
	End Sub
 
	Private Function SkipToken(sToken, nStart)
		SkipToken = InstrB(nStart, VarArrayBinRequest, sToken)
		If SkipToken = 0 then
			Response.write "Error in parsing uploaded binary request."
			Response.End
		end if
		SkipToken = SkipToken + LenB(sToken)
	End Function
 
	Private Function FindToken(sToken, nStart)
		FindToken = InstrB(nStart, VarArrayBinRequest, sToken)
	End Function
 
	Private Function ExtractField(sToken, nStart)
		Dim nEnd
		nEnd = InstrB(nStart, VarArrayBinRequest, sToken)
		If nEnd = 0 then
			Response.write "Error in parsing uploaded binary request."
			Response.End
		end if
		ExtractField = String2Byte(MidB(VarArrayBinRequest, nStart, nEnd-nStart))
	End Function
 
	'String to byte string conversion
	Private Function Byte2String(sString)
		Dim i
		For i = 1 to Len(sString)
		   Byte2String = Byte2String & ChrB(AscB(Mid(sString,i,1)))
		Next
	End Function
 
	'Byte string to string conversion
	Private Function String2Byte(bsString)
		Dim i
		String2Byte =""
		For i = 1 to LenB(bsString)
		   String2Byte = String2Byte & Chr(AscB(MidB(bsString,i,1))) 
		Next
	End Function
End Class
 
Class UploadedFile
	Public ContentType
	Public Start
	Public Length
	Public Path
	Private nameOfFile
 
    ' Need to remove characters that are valid in UNIX, but not in Windows
    Public Property Let FileName(fN)
        nameOfFile = fN
        nameOfFile = SubstNoReg(nameOfFile, "\", "_")
        nameOfFile = SubstNoReg(nameOfFile, "/", "_")
        nameOfFile = SubstNoReg(nameOfFile, ":", "_")
        nameOfFile = SubstNoReg(nameOfFile, "*", "_")
        nameOfFile = SubstNoReg(nameOfFile, "?", "_")
        nameOfFile = SubstNoReg(nameOfFile, """", "_")
        nameOfFile = SubstNoReg(nameOfFile, "<", "_")
        nameOfFile = SubstNoReg(nameOfFile, ">", "_")
        nameOfFile = SubstNoReg(nameOfFile, "|", "_")
    End Property
 
    Public Property Get FileName()
        FileName = nameOfFile
    End Property
 
    'Public Property Get FileN()ame
End Class
 
 
' Does not depend on RegEx, which is not available on older VBScript
' Is not recursive, which means it will not run out of stack space
Function SubstNoReg(initialStr, oldStr, newStr)
    Dim currentPos, oldStrPos, skip
    If IsNull(initialStr) Or Len(initialStr) = 0 Then
        SubstNoReg = ""
    ElseIf IsNull(oldStr) Or Len(oldStr) = 0 Then
        SubstNoReg = initialStr
    Else
        If IsNull(newStr) Then newStr = ""
        currentPos = 1
        oldStrPos = 0
        SubstNoReg = ""
        skip = Len(oldStr)
        Do While currentPos <= Len(initialStr)
            oldStrPos = InStr(currentPos, initialStr, oldStr)
            If oldStrPos = 0 Then
                SubstNoReg = SubstNoReg & Mid(initialStr, currentPos, Len(initialStr) - currentPos + 1)
                currentPos = Len(initialStr) + 1
            Else
                SubstNoReg = SubstNoReg & Mid(initialStr, currentPos, oldStrPos - currentPos) & newStr
                currentPos = oldStrPos + skip
            End If
        Loop
    End If
End Function
%>
[+][-]07.01.2008 at 03:49PM PDT, ID: 21912237

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[+][-]07.01.2008 at 04:00PM PDT, ID: 21912295

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[+][-]07.01.2008 at 04:54PM PDT, ID: 21912495

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[+][-]07.02.2008 at 11:17AM PDT, ID: 21919114

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[+][-]07.02.2008 at 01:08PM PDT, ID: 21920185

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[+][-]07.02.2008 at 01:28PM PDT, ID: 21920392

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[+][-]07.02.2008 at 01:59PM PDT, ID: 21920710

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About this solution

Zone: Active Server Pages (ASP)
Tags: ASP
Sign Up Now!
Solution Provided By: bui_trung_hieu
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07.02.2008 at 02:30PM PDT, ID: 21920906

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