encode method

@override Future<Map<String, dynamic>> encode(dynamic content)

Implementation

@override
Future<Map<String, dynamic>> encode(dynamic content) async {
  if (content is! RemoteAttachmentContent) {
    throw const FormatException('Content must be RemoteAttachmentContent');
  }
  if (!content.url.startsWith('http')) {
    throw Exception('Scheme must be http or https');
  }
  final scheme = Uri.parse(content.url).scheme; // 'http' or 'https'
  final parameters = {
    'contentDigest': content.contentDigest,
    'salt': bytesToHex(content.salt, include0x: false),
    'nonce': bytesToHex(content.nonce, include0x: false),
    'secret': bytesToHex(content.secret, include0x: false),
    'scheme': scheme,
    'contentLength': content.contentLength.toString(),
    'filename': content.filename,
  };
  if (content.description != null && content.description!.isNotEmpty) {
    parameters['description'] = content.description!;
  }
  return {
    'content': utf8.encode(content.url),
    'parameters': parameters,
  };
}