ConfigProvider.php

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<?php
namespace Magento\Captcha\Model\Checkout;

class ConfigProvider implements \Magento\Checkout\Model\ConfigProviderInterface
{
    protected $storeManager;

    protected $captchaData;

    protected $formIds;

    public function __construct(
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Captcha\Helper\Data $captchaData,
        array $formIds
    ) {
        $this->storeManager = $storeManager;
        $this->captchaData = $captchaData;
        $this->formIds = $formIds;
    }

    public function getConfig()
    {
        $config = [];
        foreach ($this->formIds as $formId) {
            $config['captcha'][$formId] = [
                'isCaseSensitive' => $this->isCaseSensitive($formId),
                'imageHeight' => $this->getImageHeight($formId),
                'imageSrc' => $this->getImageSrc($formId),
                'refreshUrl' => $this->getRefreshUrl(),
                'isRequired' => $this->isRequired($formId)
            ];
        }
        return $config;
    }

    protected function isCaseSensitive($formId)
    {
        return (boolean)$this->getCaptchaModel($formId)->isCaseSensitive();
    }

    protected function getImageHeight($formId)
    {
        return $this->getCaptchaModel($formId)->getHeight();
    }

    protected function getImageSrc($formId)
    {
        if ($this->isRequired($formId)) {
            $captcha = $this->getCaptchaModel($formId);
            $captcha->generate();
            return $captcha->getImgSrc();
        }
        return '';
    }

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

    protected function isRequired($formId)
    {
        return (boolean)$this->getCaptchaModel($formId)->isRequired();
    }

    protected function getCaptchaModel($formId)
    {
        return $this->captchaData->getCaptcha($formId);
    }
}