[TYPO3-english] Extabse access check best practice

[Viktor Livakivskyi]

Hello, List.

I have very trivial task, but I don't know the expected way to handle it.
Say, I have a controller with:
public function getObject($object) {}

And I want to ensure, that action will perform only if $object->getOwner() === $loggedInUser

Now the question: how this check is supposed to be?

1. Simple if() condition inside of an action, which throws an excpetion or redirects to errorAction() in case of access violation. I don't like this solution, because it will force me to add such an if() in every action, that needs such a check. Sure, I can create some Trait, that perfroms this check and call ->checkAccess() from each of such controller actions, but still it seems like dirty for me.

2. Controller argument validator. Seems like more reliable solution, because I have separate class, that performs only what it should perform (validate access permissions). But is this really a validation or a misuse?

3. Some heavy system, based on signals, sent before action emitted or so.

4. Your variant?