paypal ipn

pay_pal_notification.rb

#Original code from ActiveMerchant::PayPalNotification
#Modified by me to account for multiple items and custom flag
#Also bypassed the acknowledge if environment is "test"

require 'net/http'
class PayPalNotification

  class Error < StandardError

  end
  attr_accessor :params, :raw

  def initialize(raw)
    @params  = Hash.new
    @raw     = ""
    parse(raw)
  end


  def received_at
    Time.parse @params['payment_date']
  end

  def custom
    @params['custom']
  end

  def status
    @params['payment_status']
  end

  # Id of this transaction (paypal number)
  def transaction_id
    @params['txn_id']
  end

  # What type of transaction are we dealing with?
  #  "cart" "send_money" "web_accept" are possible here.
  def type
    @params['txn_type']
  end

  #unique item identifier
  def item_number
    @params['item_number']
  end

  # the money amount we received in X.2 decimal.
  def gross
    @params['mc_gross'].to_s.to_f
  end

  # the markup paypal charges for the transaction
  def fee
    @params['mc_fee'].to_s.to_f
  end

  # What currency have we been dealing with
  def currency
    @params['mc_currency']
  end

  # This is the invoice which you passed to paypal
  def invoice
    @params['invoice']
  end

  def first_name
    @params['first_name']
  end

  def last_name
    @params['last_name']
  end

  def payer_email
    @params['payer_email']
  end

  def account
    @params['business'] || @params['receiver_email']
  end

  # Was the transaction complete?
  def completed?
    status == "Completed"
  end

  def failed?
    status == "Failed"
  end

  def denied?
    status == "Denied"
  end


  def valid?
    acknowledge && completed?
  end

  def acknowledge

    # use the POSTed information to create a call back URL to PayPal
    query = 'cmd=_notify-validate'
    @params.each_pair do |key, value|
      query = query + '&' + key + '=' + value unless key == 'register/pay_pal_ipn.html/pay_pal_ipn'
    end

    # Verify all this with paypal
    http = Net::HTTP.start(paypal_url, 80)
    response = http.post('/cgi-bin/webscr', query).body.chomp
    http.finish

    raise Error.new("Faulty paypal result: #{response}") unless ["VERIFIED", "INVALID"].include?(response)

    response == "VERIFIED"
  end

  protected

  def paypal_url
    production?  ? 'www.paypal.com' : 'www.sandbox.paypal.com'
  end

  def production?
     Rails.env.production?
  end

  private

  # Take the posted data and move the relevant data into a hash
  def parse(post)
    @raw = post
    for line in post.split('&')
      key, value = *line.scan( %r{^(\w+)\=(.*)$} ).flatten
      params[key] = CGI.unescape(value)
    end
  end


end