silverstripe-framework/filesystem/flysystem/ProtectedAdapter.php

<?php

namespace SilverStripe\Filesystem\Flysystem;

use League\Flysystem\AdapterInterface;

/**
 * An adapter which does not publicly expose protected files
 */
interface ProtectedAdapter extends AdapterInterface {

	/**
	 * Provide downloadable url that is restricted to granted users
	 *
	 * @param string $path
	 * @return string|null
	 */
	public function getProtectedUrl($path);
}