CheckUserForgotPasswordBackendObserver.php

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<?php
namespace Magento\Captcha\Observer;

use Magento\Framework\Event\ObserverInterface;

class CheckUserForgotPasswordBackendObserver implements ObserverInterface
{
    protected $_helper;

    protected $captchaStringResolver;

    protected $_session;

    protected $_actionFlag;

    protected $messageManager;

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

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $formId = 'backend_forgotpassword';
        $captchaModel = $this->_helper->getCaptcha($formId);
        $controller = $observer->getControllerAction();
        $email = (string)$observer->getControllerAction()->getRequest()->getParam('email');
        $params = $observer->getControllerAction()->getRequest()->getParams();
        if (!empty($email)
            && !empty($params)
            && $captchaModel->isRequired()
            && !$captchaModel->isCorrect($this->captchaStringResolver->resolve($controller->getRequest(), $formId))
        ) {
            $this->_session->setEmail((string)$controller->getRequest()->getPost('email'));
            $this->_actionFlag->set('', \Magento\Framework\App\Action\Action::FLAG_NO_DISPATCH, true);
            $this->messageManager->addError(__('Incorrect CAPTCHA'));
            $controller->getResponse()->setRedirect(
                $controller->getUrl('*/*/forgotpassword', ['_nosecret' => true])
            );
        }

        return $this;
    }
}