A simple example of how to implement a datafeed listener in Ruby on Rails. It especially focuses on decrypting the RC4 encryption.

1. Create a new Datafeeds controller with the code below or paste the method into your own controller.
2. Edit the API_KEY with the API key from your own store.

• You must have ruby-rc4 installed.
• You must have Nokogiri installed.
• This example is for a v060 datafeed. It may have to be adapted for any other version.

• Be sure to use CGI::unescape instead of URI::unescape or URI::decode. The URI methods will screw up the decoding and you'll get weird artifacts in your XML.
• If you get an InvalidAuthenticityToken error in Rails you'll have to disable protect_from_forgery for the action being called.

class DatafeedsController < ApplicationController
 
  API_KEY = 'YOUR_API_KEY_GOES_HERE'
 
  # Parses Foxycart datafeed v060
  # see http://wiki.foxycart.com/docs/datafeed for details
  def create
 
    require 'rc4'
    require 'nokogiri'
 
    decryptor = RC4.new(API_KEY) 
    xml = decryptor.decrypt(CGI::unescape(params['FoxyData']))
 
    feed = Nokogiri::XML(xml)
    feed.xpath('.//transaction').each do |transaction|
 
      # PROCESS THE FEED AS YOU LIKE HERE
 
    end
 
    render :text => 'foxy'
 
    rescue Exception=>e
      render :text => e.to_s
 
  end
 
end