copy method

@override Future<void> copy(String sourceKey, String destKey)

Copy an object, including its metadata.

Local: filesystem-level copy. Encrypted: re-encrypts when the destination resolves to a different encryption key. Remote: server- side CopyObject. The metadata travels with the body.

Implementation

@override
Future<void> copy(String sourceKey, String destKey) async {
  checkNotDisposed();
  final manifest = await _readManifest(sourceKey);
  if (manifest == null) throw FileNotFoundError(sourceKey);

  final destPrevious = await _readManifest(destKey);
  final destGeneration = (destPrevious?.generation ?? -1) + 1;
  for (var i = 0; i < manifest.chunkCount; i++) {
    final chunk = await _readChunk(sourceKey, manifest.generation, i);
    await _putChunk(destKey, destGeneration, i, chunk);
  }
  await _writeManifest(
    destKey,
    generation: destGeneration,
    chunkCount: manifest.chunkCount,
    totalSize: manifest.totalSize,
    contentType: manifest.contentType,
    metadata: manifest.metadata,
  );
  await _deleteGeneration(destKey, destPrevious);
}