TYPO3 v15 dev-main snapshot ()

2026-08-10 22:31:00 +02:00
commit f9941541b7
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+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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!
+ */
+
+namespace TYPO3\CMS\Backend\ViewHelpers;
+
+use Psr\Http\Message\ServerRequestInterface;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use TYPO3\CMS\Backend\View\AuthenticationStyleInformation;
+use TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
+use TYPO3\CMS\Core\Imaging\Exception\InvalidSvgException;
+use TYPO3\CMS\Core\Imaging\Svg\SvgDocumentFactory;
+use TYPO3\CMS\Core\Imaging\Svg\SvgDocumentService;
+use TYPO3\CMS\Core\Localization\LanguageService;
+use TYPO3\CMS\Core\Package\Cache\PackageDependentCacheIdentifier;
+use TYPO3\CMS\Core\SystemResource\Exception\SystemResourceDoesNotExistException;
+use TYPO3\CMS\Core\SystemResource\Publishing\SystemResourcePublisherInterface;
+use TYPO3\CMS\Core\SystemResource\Type\SystemResourceInterface;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
+
+/**
+ * ViewHelper to display the login logo.
+ *
+ * ```
+ *   <backend:loginLogo />
+ * ```
+ *
+ * @see https://docs.typo3.org/permalink/t3viewhelper:typo3-backend-loginlogo
+ * @internal
+ */
+final class LoginLogoViewHelper extends AbstractViewHelper
+{
+    /**
+     * @var bool
+     */
+    protected $escapeOutput = false;
+
+    public function __construct(
+        private readonly AuthenticationStyleInformation $authenticationStyleInformation,
+        private readonly PackageDependentCacheIdentifier $packageDependentCacheIdentifier,
+        #[Autowire(service: 'cache.assets')]
+        private readonly FrontendInterface $cache,
+        private readonly SystemResourcePublisherInterface $resourcePublisher,
+        private readonly SvgDocumentFactory $svgDocumentFactory,
+        private readonly SvgDocumentService $svgDocumentService,
+    ) {}
+
+    public function render(): string
+    {
+        $languageService = $this->getLanguageService();
+        $logo = $this->authenticationStyleInformation->getLogo();
+        $alternativeText = $languageService->sL('LLL:EXT:backend/Resources/Private/Language/locallang_login.xlf:typo3.altText');
+        if ($logo !== null) {
+            $alternativeText = $this->authenticationStyleInformation->getLogoAlt() ?: $alternativeText;
+        } else {
+            $logo = $this->authenticationStyleInformation->getDefaultLogo();
+        }
+
+        if ($logo instanceof SystemResourceInterface && ($renderedSvg = $this->getInlineSvg($logo)) !== null) {
+            return $renderedSvg;
+        }
+
+        $request = null;
+        if ($this->renderingContext->hasAttribute(ServerRequestInterface::class)) {
+            $request = $this->renderingContext->getAttribute(ServerRequestInterface::class);
+        }
+        $uri = (string)$this->resourcePublisher->generateUri($logo, $request);
+        return $this->renderImage($uri, $alternativeText);
+    }
+
+    private function renderImage(string $uri, string $alt): string
+    {
+        return sprintf('<img %s>', GeneralUtility::implodeAttributes([
+            'src' => $uri,
+            'alt' => $alt,
+        ], true));
+    }
+
+    private function getInlineSvg(SystemResourceInterface $svg): ?string
+    {
+        $cacheIdentifier = $this->packageDependentCacheIdentifier
+            ->withPrefix('LoginLogo')
+            ->withAdditionalHashedIdentifier((string)$svg)
+            ->toString();
+        if ($this->cache->has($cacheIdentifier)) {
+            return $this->cache->get($cacheIdentifier);
+        }
+
+        $svgContent = $this->parseSvg($svg);
+        $this->cache->set($cacheIdentifier, $svgContent);
+        return $svgContent;
+    }
+
+    private function parseSvg(SystemResourceInterface $svg): ?string
+    {
+        if (!str_ends_with($svg->getName(), '.svg')) {
+            return null;
+        }
+        try {
+            $svgContent = $svg->getContents();
+        } catch (SystemResourceDoesNotExistException) {
+            return null;
+        }
+
+        // SVG is sanitized, because login screen needs increased security precautions.
+        // Links are stripped so the rendered logo cannot contain clickable areas.
+        try {
+            $document = $this->svgDocumentFactory->fromStringAndSanitize($svgContent, true);
+        } catch (InvalidSvgException) {
+            return null;
+        }
+
+        // Logo is decorative; the login page has its own heading.
+        $document->documentElement->setAttribute('aria-hidden', 'true');
+        return $this->svgDocumentService->toInlineMarkup($document);
+    }
+
+    private function getLanguageService(): LanguageService
+    {
+        return $GLOBALS['LANG'];
+    }
+}