9.5/_thumbnail_controller_8php_source.html

<?php

declare(strict_types = 1);

namespace ‪TYPO3\CMS\Backend\Controller\File;


/*

 * This file is part of the TYPO3 CMS project.

 *

 * It is free software; you can redistribute it and/or modify it under

 * the terms of the GNU General Public License, either version 2

 * of the License, or any later version.

 *

 * For the full copyright and license information, please read the

 * LICENSE.txt file that was distributed with this source code.

 *

 * The TYPO3 project - inspiring people to share!

 */


use Psr\Http\Message\ResponseInterface;

use Psr\Http\Message\ServerRequestInterface;

use ‪TYPO3\CMS\Core\Http\Response;

use ‪TYPO3\CMS\Core\Resource\ProcessedFile;

use ‪TYPO3\CMS\Core\Resource\ResourceFactory;

use ‪TYPO3\CMS\Core\Utility\ArrayUtility;

use ‪TYPO3\CMS\Core\Utility\GeneralUtility;


class ‪ThumbnailController

{

    protected ‪$defaultConfiguration = [

        'width' => 64,

        'height' => 64,

        'crop' => null,

    ];


    public function ‪render(ServerRequestInterface $request): ResponseInterface

    {

        try {

            $parameters = $this->‪extractParameters($request->getQueryParams());

            $response = $this->‪generateThumbnail(

                $parameters['fileId'] ?? null,

                $parameters['configuration'] ?? []

            );

        } catch (\‪TYPO3\CMS\Core\Resource\‪Exception $exception) {

            // catch and handle only resource related exceptions

            $response = $this->‪generateNotFoundResponse();

        }


        return $response;

    }


    protected function ‪extractParameters(array $queryParameters)

    {

        $expectedHash = GeneralUtility::hmac(

            $queryParameters['parameters'] ?? '',

            ThumbnailController::class

        );

        if (!hash_equals($expectedHash, $queryParameters['hmac'] ?? '')) {

            throw new \InvalidArgumentException(

                'HMAC could not be verified',

                1534484203

            );

        }


        return json_decode($queryParameters['parameters'] ?? null, true);

    }


    protected function ‪generateThumbnail($fileId, array $configuration): ResponseInterface

    {

        $file = ‪ResourceFactory::getInstance()->‪getFileObject($fileId);

        if (empty($file) || $file->isMissing()) {

            return $this->‪generateNotFoundResponse();

        }


        $processingConfiguration = ‪$this->defaultConfiguration;

        ‪ArrayUtility::mergeRecursiveWithOverrule(

            $processingConfiguration,

            $configuration

        );


        $processedImage = $file->process(

            ‪ProcessedFile::CONTEXT_IMAGECROPSCALEMASK,

            $processingConfiguration

        );

        $filePath = $processedImage->getForLocalProcessing(false);

        return new ‪Response($filePath, 200, [

            'Content-Type' => $processedImage->getMimeType()

        ]);

    }


    protected function ‪generateNotFoundResponse(): ResponseInterface

    {

        return new ‪Response('', 404);

    }

}