DefaultCaptcha.php

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<?php
namespace Magento\Captcha\Block\Captcha;

class DefaultCaptcha extends \Magento\Framework\View\Element\Template
{
    protected $_template = 'Magento_Captcha::default.phtml';

    protected $_captcha;

    protected $_captchaData;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Captcha\Helper\Data $captchaData,
        array $data = []
    ) {
        parent::__construct($context, $data);
        $this->_captchaData = $captchaData;
    }

    public function getTemplate()
    {
        return $this->getIsAjax() ? '' : $this->_template;
    }

    public function getRefreshUrl()
    {
        $store = $this->_storeManager->getStore();
        return $store->getUrl('captcha/refresh', ['_secure' => $store->isCurrentlySecure()]);
    }

    protected function _toHtml()
    {
        if ($this->getCaptchaModel()->isRequired()) {
            $this->getCaptchaModel()->generate();
            return parent::_toHtml();
        }
        return '';
    }

    public function getCaptchaModel()
    {
        return $this->_captchaData->getCaptcha($this->getFormId());
    }
}