sclass DownloadedMedia {
  S cmd;
  Map info;
  
  *(S *cmd, S json) {
    info = jsonDecodeMap(json);
  }
  
  File mediaFile aka get() { ret newFile((S) info.get("_filename")); }
  
  O get(S key) { ret info.get(key); }
  
  toString { ret "DownloadedMedia(" + mediaFile() + ")"; }
}