WorkspacePreview.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\Workspaces\Middleware;
 
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Message\UriInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use Symfony\Component\HttpFoundation\Cookie;
use ‪TYPO3\CMS\Backend\FrontendBackendUserAuthentication;
use ‪TYPO3\CMS\Core\Authentication\BackendUserAuthentication;
use ‪TYPO3\CMS\Core\Context\Context;
use ‪TYPO3\CMS\Core\Context\UserAspect;
use ‪TYPO3\CMS\Core\Context\WorkspaceAspect;
use ‪TYPO3\CMS\Core\Database\ConnectionPool;
use ‪TYPO3\CMS\Core\Http\CookieHeaderTrait;
use ‪TYPO3\CMS\Core\Http\HtmlResponse;
use ‪TYPO3\CMS\Core\Http\NormalizedParams;
use ‪TYPO3\CMS\Core\Http\Stream;
use ‪TYPO3\CMS\Core\Localization\LanguageService;
use ‪TYPO3\CMS\Core\Routing\RouteResultInterface;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
use ‪TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
use ‪TYPO3\CMS\Workspaces\Authentication\PreviewUserAuthentication;
 
class ‪WorkspacePreview implements MiddlewareInterface
{
    use ‪CookieHeaderTrait;
 
    protected ‪$previewKey = 'ADMCMD_prev';
 
    public function ‪process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $addInformationAboutDisabledCache = false;
        $keyword = $this->‪getPreviewInputCode($request);
        $setCookieOnCurrentRequest = false;
        $normalizedParams = $request->getAttribute('normalizedParams');
        $context = GeneralUtility::makeInstance(Context::class);
 
        // First, if a Log out is happening, a custom HTML output page is shown and the request exits with removing
        // the cookie for the backend preview.
        if ($keyword === 'LOGOUT') {
            // "log out", and unset the cookie
            $message = $this->‪getLogoutTemplateMessage($request->getUri());
            $response = new ‪HtmlResponse($message);
            return $this->‪addCookie('', $normalizedParams, $response);
        }
 
        // If the keyword is ignore, then the preview is not managed as "Preview User" but handled
        // via the regular backend user or even no user if the GET parameter ADMCMD_noBeUser is set
        if (!empty($keyword) && $keyword !== 'IGNORE' && $keyword !== 'LIVE') {
            $routeResult = $request->getAttribute('routing', null);
            // A keyword was found in a query parameter or in a cookie
            // If the keyword is valid, activate a BE User and override any existing BE Users
            // (in case workspace ID was given and a corresponding site to be used was found)
            $previewWorkspaceId = (int)$this->‪getWorkspaceIdFromRequest($request, $keyword);
            if ($previewWorkspaceId > 0 && $routeResult instanceof ‪RouteResultInterface) {
                $previewUser = $this->‪initializePreviewUser($previewWorkspaceId);
                if ($previewUser instanceof ‪PreviewUserAuthentication) {
                    ‪$GLOBALS['BE_USER'] = $previewUser;
                    // Register the preview user as aspect
                    $this->‪setBackendUserAspect($context, $previewUser);
                    // If the GET parameter is set, and we have a valid Preview User, the cookie needs to be
                    // set and the GET parameter should be removed.
                    $setCookieOnCurrentRequest = $request->getQueryParams()[‪$this->previewKey] ?? false;
                }
            }
        }
 
        // If keyword is set to "LIVE", then ensure that there is no workspace preview, but keep the BE User logged in.
        // This option is solely used to ensure that a be user can preview the live version of a page in the
        // workspace preview module.
        if ($keyword === 'LIVE' && ‪$GLOBALS['BE_USER'] instanceof ‪FrontendBackendUserAuthentication) {
            // We need to set the workspace to live here
            ‪$GLOBALS['BE_USER']->setTemporaryWorkspace(0);
            // Register the backend user as aspect
            $this->‪setBackendUserAspect($context, ‪$GLOBALS['BE_USER']);
            // Caching is disabled, because otherwise generated URLs could include the keyword parameter
            $request = $request->withAttribute('noCache', true);
            $addInformationAboutDisabledCache = true;
            $setCookieOnCurrentRequest = false;
        }
 
        $response = $handler->handle($request);
 
        if (‪$GLOBALS['TSFE'] instanceof ‪TypoScriptFrontendController && $addInformationAboutDisabledCache) {
            ‪$GLOBALS['TSFE']->set_no_cache('GET Parameter ADMCMD_prev=LIVE was given', true);
        }
 
        // Add an info box to the frontend content
        if (‪$GLOBALS['TSFE'] instanceof ‪TypoScriptFrontendController && ‪$GLOBALS['TSFE']->isOutputting(true) && $context->getPropertyFromAspect('workspace', 'isOffline', false)) {
            $previewInfo = $this->‪renderPreviewInfo(‪$GLOBALS['TSFE'], $request->getUri());
            $body = $response->getBody();
            $body->rewind();
            $content = $body->getContents();
            $content = str_ireplace('</body>', $previewInfo . '</body>', $content);
            $body = new ‪Stream('php://temp', 'rw');
            $body->write($content);
            $response = $response->withBody($body);
        }
 
        // If the GET parameter ADMCMD_prev is set, then a cookie is set for the next request to keep the preview user
        if ($setCookieOnCurrentRequest) {
            $response = $this->‪addCookie($keyword, $normalizedParams, $response);
        }
        return $response;
    }
 
    protected function ‪getLogoutTemplateMessage(UriInterface $currentUrl): string
    {
        $currentUrl = $this->‪removePreviewParameterFromUrl($currentUrl);
        if (‪$GLOBALS['TYPO3_CONF_VARS']['FE']['workspacePreviewLogoutTemplate']) {
            $templateFile = GeneralUtility::getFileAbsFileName(‪$GLOBALS['TYPO3_CONF_VARS']['FE']['workspacePreviewLogoutTemplate']);
            if (@is_file($templateFile)) {
                $message = (string)file_get_contents($templateFile);
            } else {
                $message = $this->‪getLanguageService()->‪sL('LLL:EXT:workspaces/Resources/Private/Language/locallang_mod.xlf:previewLogoutError');
                $message = htmlspecialchars($message);
                $message = sprintf($message, '<strong>', '</strong><br>', $templateFile);
            }
        } else {
            $message = $this->‪getLanguageService()->‪sL('LLL:EXT:workspaces/Resources/Private/Language/locallang_mod.xlf:previewLogoutSuccess');
            $message = htmlspecialchars($message);
            $message = sprintf($message, '<a href="' . htmlspecialchars((string)$currentUrl) . '">', '</a>');
        }
        return sprintf($message, htmlspecialchars((string)$currentUrl));
    }
 
    protected function ‪getWorkspaceIdFromRequest(ServerRequestInterface $request, string $inputCode): ?int
    {
        $previewData = $this->‪getPreviewData($inputCode);
        if (!is_array($previewData)) {
            // ADMCMD command could not be executed! (No keyword configuration found)
            return null;
        }
        if ($request->getMethod() === 'POST') {
            throw new \Exception('POST requests are incompatible with keyword preview.', 1294585191);
        }
        // Validate configuration
        $previewConfig = json_decode($previewData['config'], true);
        if (!$previewConfig['fullWorkspace']) {
            throw new \Exception('Preview configuration did not include a workspace preview', 1294585190);
        }
        return (int)$previewConfig['fullWorkspace'];
    }
 
    protected function ‪initializePreviewUser(int $workspaceUid): ?‪PreviewUserAuthentication
    {
        $previewUser = GeneralUtility::makeInstance(PreviewUserAuthentication::class);
        if ($previewUser->setTemporaryWorkspace($workspaceUid)) {
            return $previewUser;
        }
        return null;
    }
 
    protected function ‪addCookie(string $keyword, ‪NormalizedParams $normalizedParams, ResponseInterface $response): ResponseInterface
    {
        $cookieSameSite = $this->sanitizeSameSiteCookieValue(
            strtolower(‪$GLOBALS['TYPO3_CONF_VARS']['BE']['cookieSameSite'] ?? Cookie::SAMESITE_STRICT)
        );
        // None needs the secure option (only allowed on HTTPS)
        $cookieSecure = $cookieSameSite === Cookie::SAMESITE_NONE || $normalizedParams->‪isHttps();
 
        $cookie = new Cookie(
            $this->previewKey,
            $keyword,
            0,
            $normalizedParams->‪getSitePath(),
            null,
            $cookieSecure,
            true,
            false,
            $cookieSameSite
        );
        return $response->withAddedHeader('Set-Cookie', $cookie->__toString());
    }
 
    protected function ‪getPreviewInputCode(ServerRequestInterface $request): string
    {
        return $request->getQueryParams()[‪$this->previewKey] ?? $request->getCookieParams()[‪$this->previewKey] ?? '';
    }
 
    protected function ‪getPreviewData(string $keyword)
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('sys_preview');
        return $queryBuilder
            ->select('*')
            ->from('sys_preview')
            ->where(
                $queryBuilder->expr()->eq(
                    'keyword',
                    $queryBuilder->createNamedParameter($keyword)
                ),
                $queryBuilder->expr()->gt(
                    'endtime',
                    $queryBuilder->createNamedParameter(‪$GLOBALS['EXEC_TIME'], \PDO::PARAM_INT)
                )
            )
            ->setMaxResults(1)
            ->execute()
            ->fetch();
    }
 
    protected function ‪renderPreviewInfo(‪TypoScriptFrontendController $tsfe, UriInterface $currentUrl): string
    {
        $content = '';
        if (!isset($tsfe->config['config']['disablePreviewNotification']) || (int)$tsfe->config['config']['disablePreviewNotification'] !== 1) {
            // get the title of the current workspace
            $currentWorkspaceId = $tsfe->‪whichWorkspace();
            $currentWorkspaceTitle = $this->‪getWorkspaceTitle($currentWorkspaceId);
            $currentWorkspaceTitle = htmlspecialchars($currentWorkspaceTitle);
            if ($tsfe->config['config']['message_preview_workspace']) {
                $content = sprintf(
                    $tsfe->config['config']['message_preview_workspace'],
                    $currentWorkspaceTitle,
                    $currentWorkspaceId ?? -99
                );
            } else {
                $text = $this->‪getLanguageService()->‪sL('LLL:EXT:workspaces/Resources/Private/Language/locallang_mod.xlf:previewText');
                $text = htmlspecialchars($text);
                $text = sprintf($text, $currentWorkspaceTitle, $currentWorkspaceId ?? -99);
                $stopPreviewText = $this->‪getLanguageService()->‪sL('LLL:EXT:workspaces/Resources/Private/Language/locallang_mod.xlf:stopPreview');
                $stopPreviewText = htmlspecialchars($stopPreviewText);
                if (‪$GLOBALS['BE_USER'] instanceof ‪PreviewUserAuthentication) {
                    $urlForStoppingPreview = (string)$this->‪removePreviewParameterFromUrl($currentUrl, 'LOGOUT');
                    $text .= '<br><a style="color: #000; pointer-events: visible;" href="' . htmlspecialchars($urlForStoppingPreview) . '">' . $stopPreviewText . '</a>';
                }
                $styles = [];
                $styles[] = 'position: fixed';
                $styles[] = 'top: 15px';
                $styles[] = 'right: 15px';
                $styles[] = 'padding: 8px 18px';
                $styles[] = 'background: #fff3cd';
                $styles[] = 'border: 1px solid #ffeeba';
                $styles[] = 'font-family: sans-serif';
                $styles[] = 'font-size: 14px';
                $styles[] = 'font-weight: bold';
                $styles[] = 'color: #856404';
                $styles[] = 'z-index: 20000';
                $styles[] = 'user-select: none';
                $styles[] = 'pointer-events: none';
                $styles[] = 'text-align: center';
                $styles[] = 'border-radius: 2px';
                $content = '<div id="typo3-preview-info" style="' . implode(';', $styles) . '">' . $text . '</div>';
            }
        }
        return $content;
    }
 
    protected function ‪getWorkspaceTitle(int $workspaceId): string
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('sys_workspace');
        $title = $queryBuilder
            ->select('title')
            ->from('sys_workspace')
            ->where(
                $queryBuilder->expr()->eq(
                    'uid',
                    $queryBuilder->createNamedParameter($workspaceId, \PDO::PARAM_INT)
                )
            )
            ->execute()
            ->fetchColumn();
        return (string)($title !== false ? $title : '');
    }
 
    protected function ‪removePreviewParameterFromUrl(UriInterface $url, string $newAdminCommand = ''): UriInterface
    {
        $queryString = $url->getQuery();
        if (!empty($queryString)) {
            $queryStringParts = GeneralUtility::explodeUrl2Array($queryString);
            unset($queryStringParts[$this->previewKey]);
        } else {
            $queryStringParts = [];
        }
        if ($newAdminCommand !== '') {
            $queryStringParts[‪$this->previewKey] = $newAdminCommand;
        }
        $queryString = http_build_query($queryStringParts, '', '&', PHP_QUERY_RFC3986);
        return $url->withQuery($queryString);
    }
 
    protected function ‪getLanguageService(): ‪LanguageService
    {
        return ‪$GLOBALS['LANG'] ?: ‪LanguageService::create('default');
    }
 
    protected function ‪setBackendUserAspect(‪Context $context, ‪BackendUserAuthentication $user = null)
    {
        $context->‪setAspect('backend.user', GeneralUtility::makeInstance(UserAspect::class, $user));
        $context->‪setAspect('workspace', GeneralUtility::makeInstance(WorkspaceAspect::class, $user ? $user->workspace : 0));
    }
}