ApplicationController.rb for Facebooker apps

ApplicationController.rb

class ApplicationController < ActionController::Base
  include Facebooker2::Rails::Controller

  # Needed to support IE 6 and 7
  before_filter :set_p3p_header_for_third_party_cookies

  # Add an :except here if you have controllers that you want to 
  # allow non-users to access
  before_filter :ensure_application_is_installed

  # No point in logging the request param every time, it's a base64 encoded string
  filter_parameter_logging :signed_request

  # This makes sure that the user accessing this page has your app
  # installed. If they don't they are prompted to install it.
  def ensure_application_is_installed
    if current_facebook_user
      true
    else
      return_url = "#{request.protocol}apps.facebook.com/#{your_app_path}"
      auth_url = "#{request.protocol}www.facebook.com/dialog/oauth?client_id=#{Facebooker2.app_id}&redirect_uri=#{url_for(return_url)}"
      render :text => "<fb:redirect url=\"#{auth_url}\" />"
      false
    end
  end
  
  # ... the rest of your ApplicationController
end