Rails 3使用omniauth获取Gmail联系人？

    require \'net/http\'
    require \'net/https\'
    require \'uri\'
    require \'rexml/document\'

    class ImportController < ApplicationController

      def authenticate
        @title = \"Google Authetication\"

        client_id = \"xxxxxxxxxxxxxx.apps.googleusercontent.com\"
        google_root_url = \"https://accounts.google.com/o/oauth2/auth?state=profile&redirect_uri=\"+googleauth_url+\"&response_type=code&client_id=\"+client_id.to_s+\"&approval_prompt=force&scope=https://www.google.com/m8/feeds/\"
        redirect_to google_root_url
      end

      def authorise
        begin
          @title = \"Google Authetication\"
          token = params[:code]
          client_id = \"xxxxxxxxxxxxxx.apps.googleusercontent.com\"
          client_secret = \"xxxxxxxxxxxxxx\"
          uri = URI(\'https://accounts.google.com/o/oauth2/token\')
          http = Net::HTTP.new(uri.host, uri.port)
          http.use_ssl = true
          http.verify_mode = OpenSSL::SSL::VERIFY_NONE
          request = Net::HTTP::Post.new(uri.request_uri)

          request.set_form_data(\'code\' => token, \'client_id\' => client_id, \'client_secret\' => client_secret, \'redirect_uri\' => googleauth_url, \'grant_type\' => \'authorization_code\')
          request.content_type = \'application/x-www-form-urlencoded\'
          response = http.request(request)
          response.code
          access_keys = ActiveSupport::JSON.decode(response.body)

          uri = URI.parse(\"https://www.google.com/m8/feeds/contacts/default/full?oauth_token=\"+access_keys[\'access_token\'].to_s+\"&max-results=50000&alt=json\")

          http = Net::HTTP.new(uri.host, uri.port)
          http.use_ssl = true
          http.verify_mode = OpenSSL::SSL::VERIFY_NONE
          request = Net::HTTP::Get.new(uri.request_uri)
          response = http.request(request)
          contacts = ActiveSupport::JSON.decode(response.body)
          contacts[\'feed\'][\'entry\'].each_with_index do |contact,index|

             name = contact[\'title\'][\'$t\']
             contact[\'gd$email\'].to_a.each do |email|
              email_address = email[\'address\']
              Invite.create(:full_name => name, :email => email_address, :invite_source => \"Gmail\", :user_id => current_user.id)  # for testing i m pushing it into database..
            end

          end  
        rescue Exception => ex
           ex.message
        end
        redirect_to root_path , :notice => \"Invite or follow your Google contacts.\"


      end

    end