generateMetadata method
Override this to customize creating 'Upload-Metadata'
Implementation
String generateMetadata() {
final meta = Map<String, String>.from(metadata ?? {});
if (!meta.containsKey("filename")) {
meta["filename"] = p.basename(file.path);
}
return meta.entries
.map((entry) =>
entry.key + " " + base64.encode(utf8.encode(entry.value)))
.join(",");
}