Ttl.php

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<?php
namespace Magento\PageCache\Model\System\Config\Backend;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Escaper;
use Magento\Framework\App\Config\ScopeConfigInterface;

class Ttl extends \Magento\Framework\App\Config\Value
{
    private $escaper;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        ?\Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        ?\Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = [],
        ?Escaper $escaper = null
    ) {
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
        $this->escaper = $escaper ?: ObjectManager::getInstance()->create(Escaper::class);
    }

    public function beforeSave()
    {
        $value = $this->getValue();
        if ($value < 0 || !preg_match('/^[0-9]+$/', $value)) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __(
                    'Ttl value "%1" is not valid. Please use only numbers equal or greater than zero.',
                    $this->escaper->escapeHtml($value)
                )
            );
        }
        return $this;
    }
}