Goole OAuth2 omniauth strategy

google2.rb

require 'omniauth/oauth'
require 'multi_json'

module OmniAuth
  module Strategies
    class Google2 < OAuth2
      def initialize(app, client_id = nil, client_secret = nil, options = {}, &block)
        client_options = {
          :site             => 'https://accounts.google.com/o/oauth2',
          :authorize_url    => 'https://accounts.google.com/o/oauth2/auth',
          :access_token_url => 'https://accounts.google.com/o/oauth2/token'
        }
        
        google_contacts_auth = "http://www.google.com/m8/feeds"
        options[:scope] ||= google_contacts_auth
        options[:scope] << " #{google_contacts_auth}" unless options[:scope].include?(google_contacts_auth)
        
        super(app, :google2, client_id, client_secret, client_options, options, &block)
      end
      
      protected

      def user_data
        @data ||= MultiJson.decode(@access_token.get("http://www.google.com/m8/feeds/contacts/default/full?max-results=1&alt=json"))
      end
      
      def user_info
        email = user_data['feed']['id']['$t']
        name = user_data['feed']['author'].first['name']['$t']
        name = email if name.strip == '(unknown)'

        {
          'email' => email,
          'uid'   => email,
          'name'  => name
        }
      end
      
      def auth_hash
        ui = user_info
        OmniAuth::Utils.deep_merge(super, {
          'uid' => ui['uid'],
          'user_info' => ui,
          'extra' => {'user_hash' => user_data}
        })
      end
    end
  end
end