BackendEntryPointResolver.php

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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\Core\Routing;
 
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Message\UriInterface;
use ‪TYPO3\CMS\Core\Http\NormalizedParams;
use ‪TYPO3\CMS\Core\Http\Uri;
 
class ‪BackendEntryPointResolver
{
    protected string ‪$entryPoint = '/typo3';
 
    public function ‪getPathFromRequest(ServerRequestInterface $request): string
    {
        ‪$entryPoint = $this->‪getEntryPoint($request);
        if (str_contains(‪$entryPoint, '//')) {
            $entryPointParts = parse_url(‪$entryPoint);
            /* Remove trailing slash unless, the string is '/' itself */
            ‪$entryPoint = rtrim('/' . trim($entryPointParts['path'] ?? '', '/'), '/');
        }
        return ‪$entryPoint . '/';
    }
 
    public function ‪getUriFromRequest(ServerRequestInterface $request, string $additionalPathPart = ''): UriInterface
    {
        if (str_starts_with(ltrim($additionalPathPart, '/'), 'install.php')) {
            // install entrypoint not configurable yet, therefore it's essential to return the static `typo3/install.php`
            // uri - otherwise wrong redirect would happen and leading to nested backend for admin area displayed.
            if ($request->getAttribute('normalizedParams') instanceof ‪NormalizedParams) {
                $normalizedParams = $request->getAttribute('normalizedParams');
            } else {
                $normalizedParams = ‪NormalizedParams::createFromRequest($request);
            }
            return new ‪Uri($normalizedParams->getSiteUrl() . 'typo3/install.php');
        }
        ‪$entryPoint = $this->‪getEntryPointConfiguration();
        if (str_starts_with(‪$entryPoint, 'https://') || str_starts_with(‪$entryPoint, 'http://')) {
            // fqdn, early return as all required information are available.
            return new ‪Uri(‪$entryPoint . '/' . ltrim($additionalPathPart, '/'));
        }
        if ($request->getAttribute('normalizedParams') instanceof ‪NormalizedParams) {
            $normalizedParams = $request->getAttribute('normalizedParams');
        } else {
            $normalizedParams = ‪NormalizedParams::createFromRequest($request);
        }
        if (str_starts_with(‪$entryPoint, '//')) {
            // Browser supports uri starting with `//` and uses the current request scheme for the link. Do avoid issue
            // for example checking the url at some point we prefix it with the current request protocol.
            return new ‪Uri(($normalizedParams->isHttps() ? 'https:' : 'http:') . ‪$entryPoint . '/' . ltrim($additionalPathPart, '/'));
        }
        return new ‪Uri($normalizedParams->getSiteUrl() . ‪$entryPoint . '/' . ltrim($additionalPathPart, '/'));
    }
 
    public function ‪isBackendRoute(ServerRequestInterface $request): bool
    {
        return $this->‪getBackendRoutePath($request) !== null;
    }
 
    public function ‪getBackendRoutePath(ServerRequestInterface $request): ?string
    {
        $uri = $request->getUri();
        $path = $uri->getPath();
        ‪$entryPoint = $this->‪getEntryPoint($request);
 
        if (str_contains(‪$entryPoint, '//')) {
            $entryPointParts = parse_url(‪$entryPoint);
            if ($uri->getHost() !== $entryPointParts['host']) {
                return null;
            }
            /* Remove trailing slash unless, the string is '/' itself */
            ‪$entryPoint = rtrim('/' . trim($entryPointParts['path'] ?? '', '/'), '/');
        }
 
        if ($path === ‪$entryPoint) {
            return '';
        }
        if (str_starts_with($path, ‪$entryPoint . '/')) {
            return substr($path, strlen(‪$entryPoint));
        }
        return null;
    }
 
    protected function ‪getEntryPoint(ServerRequestInterface $request): string
    {
        ‪$entryPoint = $this->‪getEntryPointConfiguration();
        if (str_contains(‪$entryPoint, '//')) {
            return ‪$entryPoint;
        }
        if ($request->getAttribute('normalizedParams') instanceof ‪NormalizedParams) {
            $normalizedParams = $request->getAttribute('normalizedParams');
        } else {
            $normalizedParams = ‪NormalizedParams::createFromRequest($request);
        }
        return $normalizedParams->getSitePath() . ‪$entryPoint;
    }
 
    protected function ‪getEntryPointConfiguration(): string
    {
        ‪$entryPoint = ‪$GLOBALS['TYPO3_CONF_VARS']['BE']['entryPoint'] ?? ‪$this->entryPoint;
        if (str_starts_with(‪$entryPoint, 'https://')
            || str_starts_with(‪$entryPoint, 'http://')
            || str_starts_with(‪$entryPoint, '//')
        ) {
            $uri = new ‪Uri(rtrim(‪$entryPoint, '/'));
            $uri = $uri->withPath($this->‪removeMultipleSlashes($uri->getPath()));
            return (string)$uri;
        }
        return $this->‪removeMultipleSlashes(trim(‪$entryPoint, '/'));
    }
 
    private function ‪removeMultipleSlashes(string $value): string
    {
        return preg_replace('/(\/+)/', '/', $value);
    }
}