DelegatingFilesystemFactory.php

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<?php
declare(strict_types=1);

namespace ILIAS\Filesystem\Provider;

use ILIAS\Filesystem\Decorator\FilesystemWhitelistDecorator;
use ILIAS\Filesystem\Decorator\ReadOnlyDecorator;
use ILIAS\Filesystem\Filesystem;
use ILIAS\Filesystem\Provider\Configuration\LocalConfig;
use ILIAS\Filesystem\Provider\FlySystem\FlySystemFilesystemFactory;
use ILIAS\Filesystem\Security\Sanitizing\FilenameSanitizer;

final class DelegatingFilesystemFactory implements FilesystemFactory
{
    private $implementation;
    private $sanitizer;

    public function __construct(FilenameSanitizer $sanitizer)
    {

        /*
         * ---------- ABSTRACTION SWITCH -------------
         * Change the factory to switch to another filesystem abstraction!
         * current: FlySystem from the php league
         * -------------------------------------------
         */
        $this->implementation = new FlySystemFilesystemFactory();

        $this->sanitizer = $sanitizer;
    }

    public function getLocal(LocalConfig $config, bool $read_only = false) : Filesystem
    {
        if ($read_only) {
            return new ReadOnlyDecorator(new FilesystemWhitelistDecorator($this->implementation->getLocal($config),
                $this->sanitizer));
        } else {
            return new FilesystemWhitelistDecorator($this->implementation->getLocal($config), $this->sanitizer);
        }
    }
}