Drupal 8 Webform 为上传的文件名添加前缀

Question

I have a webform with a file upload field. I need do one of two things. Either upload files into a subfolder inside the private area, OR, add a prefix to the filename that the user is uploading. The user can upload several files. The webform editor allows you to 'Rename' the file and use tokens for this, but I don't see any way of preserving the original file name. I can hack getFileDestinationUri() in WebformManagedFileBase.php to do what I want, but obviously I would rather not do that. Am I missing something?

Answer 1

It turns out that you can use the drupal form alter hook to alter the destination. I had thought of this but felt if was unlikely to work. It does.

Below is MY code solution: (I may be missing container types)

function _mymodule_fix_elements(&$elements) {
  foreach ($elements as $key => &$element) {
    if (strpos($key, '#') !== 0) {
      if (is_array($element)) {
        if (isset($element['#type'])) {
          if (($element['#type'] == 'fieldset') ||
              ($element['#type'] == 'webform_flexbox') ||
              ($element['#type'] == 'container')) {
            _mymodule_fix_elements($element);
          } else if ($element['#type'] == 'managed_file') {
            $pattern = $element['#upload_location'];
            if (strpos($pattern, 'private:') === 0) {
              $element['#upload_location'] = $pattern . '/' . $key;
            }
          }
        }
      }
    }
  }
}

function mymodule_form_alter(&$form, &$form_state, $id) {
  if (strpos($id, 'webform_') === 0) {
    _mymodule_fix_elements($form['elements']);
  }
}