ScopeValidator.php

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<?php
namespace Magento\Store\Model;

use Magento\Framework\App\ScopeValidatorInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\App\ScopeResolverPool;

class ScopeValidator implements ScopeValidatorInterface
{
    protected $scopeResolverPool;

    public function __construct(ScopeResolverPool $scopeResolverPool)
    {
        $this->scopeResolverPool = $scopeResolverPool;
    }

    public function isValidScope($scope, $scopeId = null)
    {
        if ($scope == ScopeConfigInterface::SCOPE_TYPE_DEFAULT && !$scopeId) {
            return true;
        }

        try {
            $scopeResolver = $this->scopeResolverPool->get($scope);
            if (!$scopeResolver->getScope($scopeId)->getId()) {
                return false;
            }
        } catch (\InvalidArgumentException $e) {
            return false;
        } catch (NoSuchEntityException $e) {
            return false;
        }

        return true;
    }
}