The purpose of this file is to help you set up and debug your FoxyCart XML DataFeed scripts. It's designed to mimic FoxyCart.com and send encrypted and encoded XML to a URL of your choice. It will print out the response that your script gives back, which should be “foxy” if successful.

Compile the following code. Create or use a sample datafeed document that is saved as “SampleData.xml” in the output executable's directory.

Requires .Net Framework 2.0 or compatible.

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
 
class Program
{
 
    private static string DataFeedKey = "[your FoxyCart datafeed key goes here]";
 
    static void Main(string[] args)
    {
        //Load data
        string cartData = (new StreamReader("SampleData.xml")).ReadToEnd();
 
        byte[] byteData = new UTF8Encoding().GetBytes(cartData);
        byte[] keyData = new ASCIIEncoding().GetBytes(DataFeedKey);
 
        //Encrypt, then URL encode
        RC4(ref byteData, keyData);
        string postData = "FoxyData=" + HttpUtility.UrlEncode(byteData);
 
        //Create a web request to send the data
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://[your datafeed processing page here]");
        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
 
        //Write POST stream
        StreamWriter sw = new StreamWriter(req.GetRequestStream(), Encoding.ASCII);
        sw.Write(new ASCIIEncoding().GetBytes(postData));
        sw.Flush();
        sw.Close();
 
        //Send it and see if it was okay
        HttpWebResponse resp = null;
        try
        {
            resp = (HttpWebResponse)req.GetResponse();
        }
        catch (WebException ex)
        {
            string err = new StreamReader(ex.Response.GetResponseStream()).ReadToEnd();
        }
    }
 
 
    /// <summary>
    /// Symetric RC4 decrypter/encrypter.  Cut-and-paste code from 
    /// http://dotnet-snippets.com/dns/rc4-encryption-SID577.aspx.
    /// Note that if you call this method twice on the same data with the same
    /// key, it will be in its original form.
    /// </summary>
    /// <param name="bytes">The data to transform.</param>
    /// <param name="key">They key used to encrypt/decrypt the data</param>
    private static void RC4(ref Byte[] bytes, Byte[] key)
    {
        Byte[] s = new Byte[256];
        Byte[] k = new Byte[256];
        Byte temp;
        int i, j;
 
        for (i = 0; i < 256; i++)
        {
            s[i] = (Byte)i;
            k[i] = key[i % key.GetLength(0)];
        }
 
        j = 0;
        for (i = 0; i < 256; i++)
        {
            j = (j + s[i] + k[i]) % 256;
            temp = s[i];
            s[i] = s[j];
            s[j] = temp;
        }
 
        i = j = 0;
 
        Byte[] ret = new Byte[bytes.GetLength(0)];
        for (int x = 0; x < bytes.GetLength(0); x++)
        {
            i = (i + 1) % 256;
            j = (j + s[i]) % 256;
            temp = s[i];
            s[i] = s[j];
            s[j] = temp;
            int t = (s[i] + s[j]) % 256;
            bytes[x] ^= s[t];
        }
    }
}