HostChecker.php

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<?php
namespace Magento\Framework\Url;

use Magento\Framework\UrlInterface;

class HostChecker
{
    private $scopeResolver;

    public function __construct(ScopeResolverInterface $scopeResolver)
    {
        $this->scopeResolver = $scopeResolver;
    }

    public function isOwnOrigin($url)
    {
        $scopeHostNames = [];
        $hostName = parse_url($url, PHP_URL_HOST);
        if (empty($hostName)) {
            return true;
        }
        foreach ($this->scopeResolver->getScopes() as $scope) {
            $scopeHostNames[] = parse_url($scope->getBaseUrl(), PHP_URL_HOST);
            $scopeHostNames[] = parse_url($scope->getBaseUrl(UrlInterface::URL_TYPE_LINK, true), PHP_URL_HOST);
        }
        $scopeHostNames = array_unique($scopeHostNames);
        return in_array($hostName, $scopeHostNames);
    }
}