Page.php

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<?php
declare(strict_types=1);

namespace Magento\CmsGraphQl\Model\Resolver;

use Magento\CmsGraphQl\Model\Resolver\DataProvider\Page as PageDataProvider;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Exception\GraphQlInputException;
use Magento\Framework\GraphQl\Exception\GraphQlNoSuchEntityException;
use Magento\Framework\GraphQl\Query\ResolverInterface;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;

class Page implements ResolverInterface
{
    private $pageDataProvider;

    public function __construct(
        PageDataProvider $pageDataProvider
    ) {
        $this->pageDataProvider = $pageDataProvider;
    }

    public function resolve(
        Field $field,
        $context,
        ResolveInfo $info,
        array $value = null,
        array $args = null
    ) {
        $pageId = $this->getPageId($args);
        $pageData = $this->getPageData($pageId);

        return $pageData;
    }

    private function getPageId(array $args): int
    {
        if (!isset($args['id'])) {
            throw new GraphQlInputException(__('"Page id should be specified'));
        }

        return (int)$args['id'];
    }

    private function getPageData(int $pageId): array
    {
        try {
            $pageData = $this->pageDataProvider->getData($pageId);
        } catch (NoSuchEntityException $e) {
            throw new GraphQlNoSuchEntityException(__($e->getMessage()), $e);
        }
        return $pageData;
    }
}