Prevent deletion of predefined folders

Hello,

Thank you for this amazing library. Would it be possible to prevent users from deleting some "main" folders? For example,

uploads
  --> folder 1
  --> folder 2
  --> folder 2

From reading the documentation this would be possible using custom service; if this is correct, could you provide a small example?

Essentially ACLs are needed... who can upload, who cannot... when you have a basic user system with Symfony.

We managed to do ACLs using the following method:

1. Inject user roles via CustomService (however your documentation is a bit wrong, it should be using TokenStorageInterface)
2. Subscribe to events and check user roles

However, there are still some things lacking:

1. You need to put a try/catch here

   FileManagerBundle/Controller/ManagerController.php

   Line 238 in 683f1a3

   public function uploadFileAction(Request $request): JsonResponse|Response {

   because otherwise the custom message is now shown. We also recommend renaming this even to PRE_FILE_UPLOAD for consistency.
2. There is no event for creating folders; just plain POST so this cannot be restricted.
3. Folders are not listed, only on the left navigation menu.

Thank you