Add cascading permission for shelves

[mso-l]

Describe the feature you'd like

Like other permissions, add the ability for books to inherite permissions from parent shelves. Combine permissions if the book is on multiple shelves. Ideally remove permissions if the book is removed from a shelve.

Describe the benefits this would bring to existing BookStack users

Bookstack users could apply initial permissions for an entire group / service / partner to a shelve, and place books they want to share with this group / service / partner. Allow to manage permissions in one place only, and allow a clear view of all books shared (unlike setting permissions on each book).

Can the goal of this request already be achieved via other means?

Not really, we've consider 2 other methods so far :

• manually cascade permissions when adding a book to a shelve, this method is not compatible with multiple shelves, and don't remove permissions when removing book from shelve
• add permissions manually on each book, this method implies fastidious management, and do not permit a clear view of shared books for all users

Have you searched for an existing open/closed issue?

• [X] I have searched for existing issues and none cover my fundamental request

How long have you been using BookStack?

1 to 5 years

Additional context

No response

[ssddanbrown]

Related to previous threads #1091 #3959 #2652 #1455