Decoding URL encoded UTF-8 strings in VBScript

urldecode, utf-8, vbscript

Solution

I want to show three methods for three vary environments. All of these methods requires JScript's `encodeURIComponent` and `decodeURIComponent` functions.

1. In ASP, using server-side JavaScript is one of most appropriate solutions :

<script language="javascript" runat="server">
URL = {
    encode : function(s){return encodeURIComponent(s).replace(/'/g,"%27").replace(/"/g,"%22")},
    decode : function(s){return decodeURIComponent(s.replace(/\+/g,  " "))}
}
</script>
<%
Response.Write URL.decode("Paris%20%E2%86%92%20Z%C3%BCrich")
Response.Write URL.encode("Paris → Zürich")
%>

2. 32-Bit only (due to MSScriptControl.ScriptControl is 32-bit only component) in any other WSH :

Dim JSEngine
Set JSEngine = CreateObject("MSScriptControl.ScriptControl")
    JSEngine.Language = "JScript"

Function UrlEncode(s)
    UrlEncode = JSEngine.CodeObject.encodeURIComponent(s)
    UrlEncode = Replace(UrlEncode, "'", "%27")
    UrlEncode = Replace(UrlEncode, """", "%22")
End Function

Function UrlDecode(s)
    UrlDecode = Replace(s, "+", " ")
    UrlDecode = JSEngine.CodeObject.decodeURIComponent(UrlDecode)
End Function

WScript.Echo UrlDecode("Paris%20%E2%86%92%20Z%C3%BCrich")
WScript.Echo UrlEncode("Paris → Zürich")

3. With 64-bit support in any other WSH using a WSC:

urlencdec.wsc (created by using WSC Wizard)

<?xml version="1.0"?>
<component>
<?component error="true" debug="true"?>
    <registration
        description="Url Encode / Decode Helper"
        progid="JSEngine.Url"
        version="1.0"
        classid="{80246bcc-45d4-4e92-95dc-4fd9a93d8529}"
    />
    <public>
        <method name="encode">
            <PARAMETER name="s"/>
        </method>
        <method name="decode">
            <PARAMETER name="s"/>
        </method>
    </public>
    <script language="JScript">
    <![CDATA[
        var description = new UrlEncodeDecodeHelper;

        function UrlEncodeDecodeHelper() {

            this.encode = encode;
            this.decode = decode;
        }

        function encode(s) {
            return encodeURIComponent(s).replace(/'/g,"%27").replace(/"/g,"%22");
        }

        function decode(s) {
            return decodeURIComponent(s.replace(/\+/g,  " "));
        }
    ]]>
    </script>
</component>

and vbs code :

Dim JSEngine
Set JSEngine = GetObject("Script:C:\urlencdec.wsc")

WScript.Echo JSEngine.decode("Paris%20%E2%86%92%20Z%C3%BCrich")
WScript.Echo JSEngine.encode("Paris → Zürich")

Problem

I need to URL decode a string in a VBScript. The string may contain Unicode characters which are encoded as multiple bytes as per UTF-8. So for example "Paris%20%E2%86%92%20Z%C3%BCrich" would decode to "Paris → Zürich". To do the job, I'm using a piece of code that looks like this: ``` Function URLDecode(str) set list = CreateObject("System.Collections.ArrayList") strLen = Len(str) for i = 1 to strLen sT = mid(str, i, 1) if sT = "%" then if i + 2 <= strLen then list.Add cbyte("&H" & mid(str, i + 1, 2)) i = i + 2 end if else list.Add asc(sT) end if next depth = 0 for each by in list.ToArray() if by and &h80 then if (by and &h40) = 0 then if depth = 0 then Err.Raise 5 val = val * 2 ^ 6 + (by and &h3f) depth = depth - 1 if depth = 0 then sR = sR & chrw(val) val = 0 end if elseif (by and &h20) = 0 then if depth > 0 then Err.Raise 5 val = by and &h1f depth = 1 elseif (by and &h10) = 0 then if depth > 0 then Err.Raise 5 val = by and &h0f depth = 2 else Err.Raise 5 end if else if depth > 0 then Err.Raise 5 sR = sR & chrw(by) end if next if depth > 0 then Err.Raise 5 URLDecode = sR End Function ``` This seems to be working well, but it looks exaggeratedly complex to me. In times of HTML5 and web standards, there must be a simpler way to get this done without a bunch of hand-made loops and conditions. Any suggestions?

Original source