Google Calendar backup for custom domain

gcal_backup.rb

#!/usr/bin/ruby

# Google Calendar backup for custom domain

require 'rubygems'
require 'mechanize'

domain, user, pass = ARGV

unless [domain, user, pass].include?(nil)
  agent = Mechanize.new
 
  agent.get("https://www.google.com/a/#{domain}/ServiceLogin?service=cl&passive=
true&nui=1&continue=https%3A%2F%2Fwww.google.com%3A443%2Fcalendar%2Fhosted%2F#{d
omain}%2Fexporticalzip") do |p|
    p.form(:action => "https://www.google.com/a/#{domain}/LoginAction2?service=c
l") do |f|
      f.Email = user
      f.Passwd = pass
      agent.submit(f)
      agent.get("https://www.google.com/calendar/hosted/#{domain}/exporticalzip"
).save_as("#{user}@#{domain}.ical.zip")
    end
  end
else
  puts "usage: gcal_backup.rb domain user password"
end