Implementing Google's hashbang/Ajax crawl with Jruby on Rails

site_controller.rb

class SiteController < ApplicationController


  def index
    # who the f*!@ knows how to make a rails route for a get parameter?
    if frag = params[:'_escaped_fragment_']
      # good read: (Akephalos)
      # http://robots.thoughtbot.com/post/1658763359/thoughtbot-and-the-holy-grail
      # http://robots.thoughtbot.com/post/4583605733/capybara-webkit
      # todo: phantomjs (webkit based)
      # https://github.com/jonleighton/poltergeist
      render text: capybara(frag)
      return
    end

  def capybara(path)
    s = SignupTest.new(nil)
    s.results(path)
  end

  class SignupTest < ActionController::IntegrationTest
    include Capybara::DSL

    def results(path)
      #Capybara.current_driver = Capybara.javascript_driver # :selenium
      require 'capybara/poltergeist'
      Capybara.current_driver = :poltergeist
      visit(path)

      p "Capybara begin page load"
      # http://stackoverflow.com/questions/9084134/timing-issues-when-checking-for-content-of-multiple-text-nodes-in-capybara
      #wait_until wait until true is returned by the block (though it will timeout after a little bit). You can also pass it a timeout value, wait_until(5), to exit after the time allotted.
      start_time = Time.now
      page.wait_until(10) do # seconds, I hope
        page.evaluate_script 'jQuery.active == 0'
      end
      p "Capybara finished page load in #{Time.now - start_time}"
      #sleep(4)

      page.body
    end
  end
   
 end