addAttachment method

Future<void> addAttachment(Attachment attachment)

Adds a new attachment to the message.

Implementation

Future<void> addAttachment(Attachment attachment) async {
  assert(attachment.fileSize != null, '');
  if (attachment.fileSize! > maxAttachmentSize) {
    throw ArgumentError(
      'The size of the attachment is ${attachment.fileSize} bytes, '
      'but the maximum size allowed is $maxAttachmentSize bytes.',
    );
  }

  final file = attachment.file;
  final uploadState = attachment.uploadState;

  // No need to cache the attachment if it's already uploaded
  // or we are on web.
  if (file == null || uploadState.isSuccess || isWeb) {
    value = [...value, attachment];
    return;
  }

  // Cache the attachment in a temporary file.
  final tempFilePath = await _saveToCache(file);

  value = [
    ...value,
    attachment.copyWith(
      file: file.copyWith(
        path: tempFilePath,
      ),
    ),
  ];
}