AuthenticationStyleInformation.php

<?php

namespace Vendor\MyExt\Xclass;

use TYPO3\CMS\Core\Http\ServerRequest;
use TYPO3\CMS\Core\Http\Uri;
use TYPO3\CMS\Core\Routing\SiteMatcher;
use TYPO3\CMS\Core\Site\Entity\NullSite;
use TYPO3\CMS\Core\Site\Entity\Site;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\PathUtility;

class AuthenticationStyleInformation extends \TYPO3\CMS\Backend\View\AuthenticationStyleInformation
{
    public function getLogo(): string
    {
        $logo = parent::getLogo();
        $config = $this->getCurrentSiteConfiguration();
        $path = $config['schoolDir'] ?? null;
        if (empty($path)) {
            return $logo;
        }

        $logoWebPath = rtrim($path, '/') . '/logo.svg';
        $logoSysPath = GeneralUtility::getFileAbsFileName($logoWebPath);

        if (!file_exists($logoSysPath)) {
            return $logo;
        }

        return PathUtility::getAbsoluteWebPath($logoSysPath);
    }


    public function getHighlightColorStyles(): string
    {
        $styles = parent::getHighlightColorStyles();
        $config = $this->getCurrentSiteConfiguration();
        $firstColor = current($config['themeColors'] ?? [['color' => null]])['color'] ?? null;
        if (empty($firstColor)) {
            return $styles;
        }

        $styles = preg_replace(
            '/\.btn-login \{ background-color: [^;]*; }/',
            '.btn-login { background-color: ' . $firstColor . '; }',
            $styles
        );

        $styles = preg_replace(
            '/\.card-login \.card-footer \{ border-color: [^;]*; \}/',
            '.card-login .card-footer { border-color: ' . $firstColor . '; }',
            $styles
        );

        return $styles;
    }

    protected function getCurrentSiteConfiguration(): array
    {
        /** @var ServerRequest $request */
        $request = $GLOBALS['TYPO3_REQUEST'] ?? null;
        if ($request === null) {
            return [];
        }

        /** @var Site|NullSite $site */
        $site = $this->findSiteByUrl($request->getUri());
        if ($site instanceof NullSite) {
            return [];
        }

        return $site->getConfiguration();
    }

    protected function findSiteByUrl(string|Uri $url)
    {
        if (is_string($url)) {
            $url = GeneralUtility::makeInstance(Uri::class, $url);
        }
        $request = GeneralUtility::makeInstance(ServerRequest::class, $url);
        $matcher = GeneralUtility::makeInstance(SiteMatcher::class);
        $routeResult = $matcher->matchRequest($request);
        return $routeResult->getSite();
    }
}