CheckUserCreateObserver.php

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<?php
namespace Magento\Captcha\Observer;

use Magento\Framework\Event\ObserverInterface;

class CheckUserCreateObserver implements ObserverInterface
{
    protected $_helper;

    protected $_actionFlag;

    protected $messageManager;

    protected $_session;

    protected $_urlManager;

    protected $captchaStringResolver;

    protected $redirect;

    public function __construct(
        \Magento\Captcha\Helper\Data $helper,
        \Magento\Framework\App\ActionFlag $actionFlag,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        \Magento\Framework\Session\SessionManagerInterface $session,
        \Magento\Framework\UrlInterface $urlManager,
        \Magento\Framework\App\Response\RedirectInterface $redirect,
        CaptchaStringResolver $captchaStringResolver
    ) {
        $this->_helper = $helper;
        $this->_actionFlag = $actionFlag;
        $this->messageManager = $messageManager;
        $this->_session = $session;
        $this->_urlManager = $urlManager;
        $this->redirect = $redirect;
        $this->captchaStringResolver = $captchaStringResolver;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $formId = 'user_create';
        $captchaModel = $this->_helper->getCaptcha($formId);
        if ($captchaModel->isRequired()) {
            $controller = $observer->getControllerAction();
            if (!$captchaModel->isCorrect($this->captchaStringResolver->resolve($controller->getRequest(), $formId))) {
                $this->messageManager->addError(__('Incorrect CAPTCHA'));
                $this->_actionFlag->set('', \Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true);
                $this->_session->setCustomerFormData($controller->getRequest()->getPostValue());
                $url = $this->_urlManager->getUrl('*/*/create', ['_nosecret' => true]);
                $controller->getResponse()->setRedirect($this->redirect->error($url));
            }
        }

        return $this;
    }
}