class Aws::S3::MultipartUpload

def extract_object_key(args, options)
  value = args[1] || options.delete(:object_key)
  case value
  when String then value
  when nil then raise ArgumentError, "missing required option :object_key"
  else
    msg = "expected :object_key to be a String, got #{value.class}"
    raise ArgumentError, msg
  end
end