from file.models import File
from folder.models import Folder
from account.models import User


def can_delete(user, f):
    if not isinstance(user, User) or (not isinstance(f, File) and not isinstance(f, Folder)):
        raise TypeError('File or Folder expected.')
    return f.father_folder and f.father_folder.check_permission(user=user) and (
            f.owner == user or (f.group and f.group.creator == user))