# File lib/termtter/api.rb, line 33
      def setup
        # NOTE: for compatible
        @connection = twitter.instance_variable_get(:@connection)
        if config.access_token.empty? || config.access_token_secret.empty?
          if config.token_file &&
               File.exist?(File.expand_path(config.token_file))
            config.access_token, config.access_token_secret = File.read(File.expand_path(config.token_file)) \
                                                                  .split(/\r?\n/).map(&:chomp)
          else
            self.authorize_by_oauth(true)
          end
        end

        access_token = OAuth::AccessToken.new(consumer, config.access_token, config.access_token_secret)
        @twitter = RubytterProxy.new(access_token, twitter_option)

        config.user_name = @twitter.verify_credentials[:screen_name]
      end