gistfile1.rb

class OpenidController < ApplicationController
  def start
    identifier = "https://mixi.jp"
    if using_open_id?(identifier)
      open_id_authentication(identifier)
    end
  end

  def open_id_authentication(identifier)
    authenticate_with_open_id(identifier,
                              :required => [ :nickname ] ) do |result, identity_url, registration|
      logger.info("result.status=#{result.status}")
      case result.status
      when :missing
        render :text=> "Sorry, the OpenID server couldn't be found"
      when :invalid
        frender :text=> "Sorry, but this does not appear to be a valid OpenID"
      when :canceled
        render :text=> "OpenID verification was canceled"
      when :failed
        render :text=> "Sorry, the OpenID verification failed"
      when :successful

        puts "identity_url" * 80
        p identity_url
        # do something

        render :text=> "ok"
      end
    end
  end
end