Listing 7. Typo: Yubikey Authentication Part 2

filename: app/model/user.rb

...
  # Authenticate a user's Yubikey ID.
  #
  # Example:
  #   @user.authenticate_yubikey(this_blog, 'thcrefhcvijl',
  #   'thcrefhcvijldvlfugbhrghkibjigdbunhjlfnbtvfbc')
  #
  def authenticate_yubikey(this_blog,
                           yubikey_id = '', yubikey_otp = '')
    if (yubikey_id.empty? ||
        yubikey_otp.empty? ||
        !yubikey_otp[0, 12].eql?(yubikey_id))
      return false
    else
      begin
        yk = Yubico.new(this_blog.yubikey_api_id,
                        this_blog.yubikey_api_key)
        return yk.verify(yubikey_otp).eql?('OK')
      rescue
        return false
      end
    end
  end
...