AttachmentContent.fromJson constructor

AttachmentContent.fromJson(Map<String, dynamic> json)

Implementation

factory AttachmentContent.fromJson(Map<String, dynamic> json) {
  // Initialize with empty data as default
  Uint8List dataBytes = Uint8List(0);

  // Process data field based on its type
  if (json.containsKey('data')) {
    var data = json['data'];

    if (data is String) {
      try {
        // First try base64 decoding
        dataBytes = base64Decode(data);
      } catch (e) {
        print('Error base64 decoding data: $e');

        // If base64 fails, try hex decoding if it looks like hex
        if (RegExp(r'^[0-9a-fA-F]+$').hasMatch(data)) {
          try {
            dataBytes = Uint8List.fromList(List<int>.generate(data.length ~/ 2, (i) => int.parse(data.substring(i * 2, i * 2 + 2), radix: 16)));
          } catch (e) {
            print('Error hex decoding data: $e');
          }
        }
      }
    } else if (data is List) {
      // Handle list of integers
      dataBytes = Uint8List.fromList(List<int>.from(data));
    } else if (data is Uint8List) {
      // Already in correct format
      dataBytes = data;
    }
  }

  return AttachmentContent(
    filename: json['filename'] as String? ?? 'attachment',
    mimeType: json['mimeType'] as String? ?? 'application/octet-stream',
    data: dataBytes,
    description: json['description'] as String?,
  );
}