DirectoryResolver.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\App\Filesystem;

use Magento\Framework\Filesystem;

class DirectoryResolver
{
    private $directoryList;

    private $filesystem;

    public function __construct(DirectoryList $directoryList, Filesystem $filesystem)
    {
        $this->directoryList = $directoryList;
        $this->filesystem = $filesystem;
    }

    public function validatePath($path, $directoryConfig = DirectoryList::MEDIA)
    {
        $directory = $this->filesystem->getDirectoryWrite($directoryConfig);
        $realPath = $directory->getDriver()->getRealPathSafety($path);
        $root = $this->directoryList->getPath($directoryConfig);

        return strpos($realPath, $root) === 0;
    }
}