Download DAM files to server folder

import org.apache.commons.lang.StringUtils;
detailFolder = 'xx'
rootPath = '/PL/'+ detailFolder
javax.jcr.NodeIterator nodeList =  info.magnolia.cms.util.QueryUtil.search("dam", "select * from [mgnl:resource] as t  where ISDESCENDANTNODE('"+rootPath+"') and name(t) = 'jcr:content'");
while(nodeList.hasNext()) {
  javax.jcr.Node currNode = nodeList.nextNode();
  println "downloading ${currNode.path}";
  try {
    javax.jcr.Binary binary = currNode.getProperty("jcr:data").getBinary()
    InputStream inputStream = binary.getStream();
 
    byte[] buffer = new byte[inputStream.available()];
    inputStream.read(buffer);
    String fileName = info.magnolia.jcr.util.PropertyUtil.getString(currNode, "fileName", "noname");
    String extension = info.magnolia.jcr.util.PropertyUtil.getString(currNode, "extension", ".bin");
    String downloadFileName = fileName.endsWith(extension) ? fileName : fileName + "." + extension;
 
    subpath = StringUtils.substringAfter(currNode.getParent().getPath(), rootPath)
    File targetFolder = new File("/some/path/dam-files/"+detailFolder+"/" + subpath);
    targetFolder.mkdirs()

    File targetFile = new File(targetFolder, downloadFileName);
    OutputStream outStream = new FileOutputStream(targetFile);
    outStream.write(buffer);
    println("File Downloaded in " + targetFile.getAbsolutePath());
  } catch (Exception x) {
      println("Error:" + x);
  }
}