Australia Post's DRC rate calculator

aus_post.rb

# Interface to Australia Post's DRC rate calculator
#
# Merchant’s web site must display statements re DRC
# It is a condition of use of the DRC that certain statements are prominently displayed on the Merchant’s web site.  
# These statements can be found at web site http://www.edeliver.com.au/Templates/ifs/IFS_DRC_Terms.htm in the section headed "Your representations". 

class AusPost
  
  AUSPOST_DRC_URL = "http://drc.edeliver.com.au/ratecalc.asp"

  # domestic services
  SERVICE_TYPE_STANDARD = "STANDARD"  # Regular Parcels
  SERVICE_TYPE_EXPRESS  = "EXPRESS"   # Express Parcels
  SERVICE_TYPE_EXP_PLT  = "EXP_PLT"   # Express Parcels Platinum
    
  # international services
  SERVICE_TYPE_AIR    = "AIR"         # Air Mail
  SERVICE_TYPE_SEA    = "SEA"         # Sea Mail
  SERVICE_TYPE_ECI_D  = "ECI_D"       # Express Courier International Document
  SERVICE_TYPE_ECI_M  = "ECI_M"       # Express Courier International Merchandise
  SERVICE_TYPE_EPI    = "EPI"         # Express Post International
  
  SERVICES_DOMESTIC = { 
      SERVICE_TYPE_STANDARD => "Regular Parcels", 
      SERVICE_TYPE_EXPRESS => "Express Parcels", 
      SERVICE_TYPE_EXP_PLT => "Express Platinum Parcels" 
  }
  
  SERVICES_INTERNATIONAL = { 
      SERVICE_TYPE_AIR => "International Air Parcels", 
      SERVICE_TYPE_SEA => "International Sea Parcels", 
      SERVICE_TYPE_ECI_D => "Express Courier International Document", 
      SERVICE_TYPE_ECI_M => "Express Courier International Merchandise", 
      SERVICE_TYPE_EPI => "Express Post International" 
  }  
  
  attr_accessor :pickup_postcode, :destination_postcode, :country, :service_type, :weight, :length, :width, :height, :quantity
  attr_accessor :charge, :err_msg, :days
  
  def test_call
    self.pickup_postcode = 3083
    self.destination_postcode = 3000
    self.country = "AU"
    self.service_type = AusPost::SERVICE_TYPE_EXPRESS
    self.weight = 500
    self.length = 250
    self.width = 250
    self.height = 250
    self.quantity = 1
    calculate_freight
  end

  def calculate_freight
    
    @err_msg = nil
    @charge = nil
    @days = nil
    
    response = split_params(
            RestClient.post(AUSPOST_DRC_URL, 
                :pickup_postcode => pickup_postcode, 
                :destination_postcode => destination_postcode, 
                :country => country || 'AU', 
                :service_type => service_type || AusPost::SERVICE_TYPE_STANDARD, 
                :weight => weight, 
                :length => length, :width => width, :height => height, 
                :quantity => quantity || 1))
        
    @charge = response[:charge].to_f
    @err_msg = response[:err_msg]
    @err_msg = nil if response[:err_msg] == "OK"
    @days = response[:days]
    
    response
    
  end

  def is_error?
    !@err_msg.nil?
  end

  def split_params(parameters)

    return_values = {}

    parameters.split("\r\n").each do |p|
      param = p.split("=")
      return_values[param[0].to_sym] = param[1].chomp
    end
    
    return_values
    
  end
  
end