GetPageByIdentifier.php

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<?php
namespace Magento\Cms\Model;

use Magento\Cms\Api\Data\PageInterface;
use Magento\Cms\Api\GetPageByIdentifierInterface;
use Magento\Framework\Exception\NoSuchEntityException;

class GetPageByIdentifier implements GetPageByIdentifierInterface
{
    private $pageFactory;

    private $pageResource;

    public function __construct(
        \Magento\Cms\Model\PageFactory $pageFactory,
        \Magento\Cms\Model\ResourceModel\Page $pageResource
    ) {
        $this->pageFactory = $pageFactory;
        $this->pageResource = $pageResource;
    }

    public function execute(string $identifier, int $storeId) : PageInterface
    {
        $page = $this->pageFactory->create();
        $page->setStoreId($storeId);
        $this->pageResource->load($page, $identifier, PageInterface::IDENTIFIER);

        if (!$page->getId()) {
            throw new NoSuchEntityException(__('The CMS page with the "%1" ID doesn\'t exist.', $identifier));
        }

        return $page;
    }
}