246 lines
8.1 KiB
PHP
246 lines
8.1 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* This file is part of the TYPO3 CMS project.
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*
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* It is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, either version 2
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* of the License, or any later version.
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*
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* For the full copyright and license information, please read the
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* LICENSE.txt file that was distributed with this source code.
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*
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* The TYPO3 project - inspiring people to share!
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*/
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namespace TYPO3\CMS\Frontend\Controller;
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use Psr\Http\Message\ResponseInterface;
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use Psr\Http\Message\ServerRequestInterface;
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use Symfony\Component\DependencyInjection\Attribute\Autoconfigure;
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use TYPO3\CMS\Core\Configuration\Features;
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use TYPO3\CMS\Core\Crypto\HashAlgo;
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use TYPO3\CMS\Core\Crypto\HashService;
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use TYPO3\CMS\Core\Exception;
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use TYPO3\CMS\Core\Http\Response;
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use TYPO3\CMS\Core\Resource\File;
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use TYPO3\CMS\Core\Resource\FileInterface;
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use TYPO3\CMS\Core\Resource\Folder;
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use TYPO3\CMS\Core\Resource\ProcessedFile;
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use TYPO3\CMS\Core\Resource\ResourceFactory;
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use TYPO3\CMS\Core\Resource\Security\FileNameValidator;
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use TYPO3\CMS\Core\Utility\GeneralUtility;
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use TYPO3\CMS\Core\Utility\MathUtility;
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/**
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* eID-Script "tx_cms_showpic"
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*
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* Shows a picture from FAL in enlarged format in a separate window.
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* Picture file and settings is supplied by GET-parameters:
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*
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* - file = fileUid or Combined Identifier
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* - encoded in a parameter Array (with weird format - see ContentObjectRenderer about ll. 1500)
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* - width, height = usual width an height, m/c supported
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* - frame
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* - bodyTag
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* - title
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*
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* @internal this is a concrete TYPO3 implementation and solely used for EXT:frontend and not part of TYPO3's Core API.
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*/
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#[Autoconfigure(public: true)]
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class ShowImageController
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{
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protected const ALLOWED_PARAMETER_NAMES = ['width', 'height', 'crop', 'bodyTag', 'title'];
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/**
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* @var \Psr\Http\Message\ServerRequestInterface
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*/
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protected $request;
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/**
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* @var File|Folder|null
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*/
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protected $file;
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/**
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* @var string
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*/
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protected $width;
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/**
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* @var int
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*/
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protected $height;
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/**
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* @var string
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*/
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protected $crop;
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/**
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* @var int|null
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*/
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protected $frame;
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/**
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* @var string
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*/
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protected $bodyTag = '<body>';
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/**
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* @var string
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*/
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protected $title = 'Image';
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/**
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* @var string
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*/
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protected $content = <<<EOF
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<!DOCTYPE html>
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<html>
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<head>
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<title>###TITLE###</title>
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<meta name="robots" content="noindex,follow" />
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</head>
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###BODY###
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###IMAGE###
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</body>
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</html>
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EOF;
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public function __construct(
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protected readonly Features $features,
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private readonly FileNameValidator $fileNameValidator,
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private readonly ResourceFactory $resourceFactory,
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) {}
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/**
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* Init function, setting the input vars in the global space.
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*
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* @throws \InvalidArgumentException
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* @throws \TYPO3\CMS\Core\Resource\Exception\FileDoesNotExistException
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*/
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public function initialize()
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{
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$fileUid = $this->request->getQueryParams()['file'] ?? null;
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$parametersArray = $this->request->getQueryParams()['parameters'] ?? null;
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// If no file-param or parameters are given, we must exit
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if (!$fileUid || !isset($parametersArray) || !is_array($parametersArray)) {
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throw new \InvalidArgumentException('No valid fileUid given', 1476048455);
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}
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// rebuild the parameter array and check if the HMAC is correct
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$parametersEncoded = implode('', $parametersArray);
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/* For backwards compatibility the HMAC is transported within the md5 param */
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$hmacParameter = $this->request->getQueryParams()['md5'] ?? null;
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$hashService = GeneralUtility::makeInstance(HashService::class);
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$hmac = $hashService->hmac(implode('|', [$fileUid, $parametersEncoded]), 'tx_cms_showpic', HashAlgo::SHA3_256);
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if (!is_string($hmacParameter) || !hash_equals($hmac, $hmacParameter)) {
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throw new \InvalidArgumentException('hash does not match', 1476048456);
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}
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// decode the parameters Array - `bodyTag` contains HTML if set and would lead
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// to a false-positive XSS-detection, that's why parameters are base64-encoded
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$parameters = json_decode(base64_decode($parametersEncoded), true) ?? [];
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foreach ($parameters as $parameterName => $parameterValue) {
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if (in_array($parameterName, static::ALLOWED_PARAMETER_NAMES, true)) {
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$this->{$parameterName} = $parameterValue;
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}
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}
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if (MathUtility::canBeInterpretedAsInteger($fileUid)) {
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$this->file = $this->resourceFactory->getFileObject((int)$fileUid);
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} else {
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$this->file = $this->resourceFactory->retrieveFileOrFolderObject($fileUid);
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}
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if (!($this->file instanceof FileInterface && $this->isFileValid($this->file))) {
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throw new Exception('File processing for local storage is denied', 1594043425);
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}
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if ($this->features->isFeatureEnabled('security.frontend.allowInsecureFrameOptionInShowImageController')) {
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$frameValue = $this->request->getQueryParams()['frame'] ?? null;
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if ($frameValue !== null && MathUtility::canBeInterpretedAsInteger($frameValue)) {
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$this->frame = (int)$frameValue;
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}
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}
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}
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/**
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* Main function which creates the image if needed and outputs the HTML code for the page displaying the image.
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* Accumulates the content in $this->content
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*/
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public function main()
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{
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$processedImage = $this->processImage();
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$imageAttributes = [
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'src' => $processedImage->getPublicUrl() ?? '',
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'alt' => $this->file->getProperty('alternative') ?: $this->title,
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'title' => $this->file->getProperty('title') ?: $this->title,
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'width' => (string)$processedImage->getProperty('width'),
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'height' => (string)$processedImage->getProperty('height'),
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];
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$markerArray = [
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'###TITLE###' => htmlspecialchars($this->file->getProperty('title') ?: $this->title),
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'###IMAGE###' => sprintf('<img %s>', GeneralUtility::implodeAttributes($imageAttributes, true)),
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'###BODY###' => $this->bodyTag,
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];
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$this->content = str_replace(array_keys($markerArray), array_values($markerArray), $this->content);
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}
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/**
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* Does the actual image processing
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*
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* @return \TYPO3\CMS\Core\Resource\ProcessedFile
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*/
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protected function processImage()
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{
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$max = str_contains($this->width . $this->height, 'm') ? 'm' : '';
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$this->height = MathUtility::forceIntegerInRange($this->height, 0);
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$this->width = MathUtility::forceIntegerInRange((int)$this->width, 0) . $max;
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$processingConfiguration = [
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'width' => $this->width,
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'height' => $this->height,
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'frame' => $this->frame,
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'crop' => $this->crop,
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];
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return $this->file->process(ProcessedFile::CONTEXT_IMAGECROPSCALEMASK, $processingConfiguration);
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}
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/**
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* Fetches the content and builds a content file out of it
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*
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* @param ServerRequestInterface $request the current request object
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* @return ResponseInterface the modified response
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*/
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public function processRequest(ServerRequestInterface $request): ResponseInterface
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{
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$this->request = $request;
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try {
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$this->initialize();
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$this->main();
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$response = new Response();
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$response->getBody()->write($this->content);
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return $response;
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} catch (\InvalidArgumentException $e) {
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// add a 410 "gone" if invalid parameters given
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return (new Response())->withStatus(410);
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} catch (Exception $e) {
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return (new Response())->withStatus(404);
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}
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}
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protected function isFileValid(FileInterface $file): bool
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{
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return $file->getStorage()->getDriverType() !== 'Local'
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|| $this->fileNameValidator->isValid(basename($file->getIdentifier()));
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}
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}
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