I want to know what does the formkey validator do : Magento\Framework\Data\Form\FormKey\Validator


Simply and in order :

  1. Magento/Framework/Data/Form/FormKey::getFormKey() : generate a formkey.

  2. Magento/Framework/Data/Form/FormKey/Validator::validate() validate that formkey.

Exemple : vendor/magento/module-customer/Controller/Account::LoginPost.php

public function execute()
    if ($this->session->isLoggedIn() || !$this->formKeyValidator->validate($this->getRequest())) {
        return $resultRedirect;

Here magento check : if a user is already logged in $this->session->isLoggedIn() or a formkey request is not valide !$this->formKeyValidator->validate($this->getRequest()), it returns and redirects to the previous page.

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