NoCookiesObserver.php

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<?php
namespace Magento\Cms\Observer;

use Magento\Framework\Event\ObserverInterface;

class NoCookiesObserver implements ObserverInterface
{
    protected $_cmsPage;

    protected $_scopeConfig;

    public function __construct(
        \Magento\Cms\Helper\Page $cmsPage,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
    ) {
        $this->_cmsPage = $cmsPage;
        $this->_scopeConfig = $scopeConfig;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $redirect = $observer->getEvent()->getRedirect();

        $pageId = $this->_scopeConfig->getValue(
            \Magento\Cms\Helper\Page::XML_PATH_NO_COOKIES_PAGE,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
        $pageUrl = $this->_cmsPage->getPageUrl($pageId);

        if ($pageUrl) {
            $redirect->setRedirectUrl($pageUrl);
        } else {
            $redirect->setRedirect(true)->setPath('cookie/index/noCookies')->setArguments([]);
        }
        return $this;
    }
}