Validator.php

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<?php
namespace Magento\Framework\Data\Form\FormKey;

use Magento\Framework\Encryption\Helper\Security;

class Validator
{
    protected $_formKey;

    public function __construct(\Magento\Framework\Data\Form\FormKey $formKey)
    {
        $this->_formKey = $formKey;
    }

    public function validate(\Magento\Framework\App\RequestInterface $request)
    {
        $formKey = $request->getParam('form_key', null);
        
        return $formKey && Security::compareStrings($formKey, $this->_formKey->getFormKey());
    }
}