Get field machine name inside HOOK_preprocess_file_link()?

Question

I am hoping to get the field name inside hook_preprocess_file_link().

I only want to alter the link of the file for certain field names.

hook_preprocess_field() would probably work, but I would prefer to use hook_preprocess_file_link().

Is it possible to get the field name in this hook?

mymodule.module

function mymodule_preprocess_file_link(&$variables, $fieldName) {
  // This returns "file_link" instead of the field name like "field_myfilefield".
  kpr($fieldName);
}

function mymodule_preprocess_field(&$variables) {
  if (isset($variables['field_name'])) {
    $fieldName = $variables['field_name'];
  }

  mymodule_preprocess_file_link($variables, $fieldName);
}

Answer 1

You need to pass the field name to the file link through hook_preprocess_field()
A similar approach is used in Themable Forms module.
Check its module file.