class ActiveStorage::Service::S3Service

def headers_for_direct_upload(key, content_type:, checksum:, filename: nil, disposition: nil, custom_metadata: {}, **)
  content_disposition = content_disposition_with(type: disposition, filename: filename) if filename
  { "Content-Type" => content_type, "Content-MD5" => checksum, "Content-Disposition" => content_disposition, **custom_metadata_headers(custom_metadata) }
end