purchase date extension attribute

estimated_purchase_date.rb

#!/usr/bin/env ruby

require 'open-uri'

def get_warranty_end(serial)
  open('https://selfsolve.apple.com/warrantyChecker.do?sn=' + serial.upcase + '&country=USA', :proxy => "http://proxy.company.com:8080") {|item|
         item.each_line {|item|}
         warranty_array = item.strip.split('"')
         purchase = warranty_array.index('PURCHASE_DATE')+2
         File.open("/etc/purchase_date", "w") {|f| f.puts warranty_array[purchase]}
         puts "<result>#{warranty_array[purchase]}</result>"
       }
end

@serial = %x(system_profiler SPHardwareDataType | awk '/Serial/ {print $4}').upcase.chomp

def check_cached(file)
  if File.exists?(file)
    f = File.open(file, "r")
    purchase_date = f.read.chomp
    puts "<result>#{purchase_date}</result>"
  else
    get_warranty_end(@serial)
  end
end

check_cached("/etc/purchase_date")