class JWT::Verify

def verify_iss
  return unless (options_iss = @options[:iss])
  iss = @payload['iss']
  options_iss = Array(options_iss).map { |item| item.is_a?(Symbol) ? item.to_s : item }
  case iss
  when *options_iss
    nil
  else
    raise(JWT::InvalidIssuerError, "Invalid issuer. Expected #{options_iss}, received #{iss || '<none>'}")
  end
end