Move files in Google Drive and take ownership

move-google-drive-files-take-ownership.gs

function copyAndDeleteFiles(sourceFolderId, destinationFolderId) {
  // Get the source and destination folders.
  var sourceFolder = DriveApp.getFolderById(sourceFolderId);
  var destinationFolder = DriveApp.getFolderById(destinationFolderId);

  // Get all files in the source folder.
  var files = sourceFolder.getFiles();

  // Copy each file to the destination folder and then delete older files with the same name.
  while (files.hasNext()) {
    var file = files.next();

    // Make a copy of the file in the destination folder
    var copiedFile = file.makeCopy(file.getName(), destinationFolder); 
    console.log('Copied file: ' + file.getName() + " to " + destinationFolder.getName());

    // Find and delete older files with the same name in the destination folder
    var fileName = file.getName();
    var existingFiles = destinationFolder.getFilesByName(fileName);
    var newestFileDate = copiedFile.getDateCreated();
    while (existingFiles.hasNext()) {
      var existingFile = existingFiles.next();
      if (existingFile.getDateCreated() < newestFileDate) {
        console.log('Deleting older file: ' + existingFile.getName());
        existingFile.setTrashed(true); // Or existingFile.delete(); for permanent deletion
      }
    }

    // Remove the original file from the source folder
    sourceFolder.removeFile(file); 
    console.log('Removed file: ' + file.getName() + " from " + sourceFolder.getName());
  }

  console.log('Finished copying and deleting files.');
}

function main() {

  // TODO:
  // copyAndDeleteFiles('source_id', 'dest_id');

}