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File: PageHandler.php
<?php

/**
 * @file lib/pkp/controllers/page/PageHandler.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2003-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class PageHandler
 *
 * @ingroup controllers_page
 *
 * @brief Handler for requests for page components such as the header, tasks,
 *  usernav, and CSS.
 */

namespace PKP\controllers\page;

use APP\handler\Handler;
use APP\template\TemplateManager;
use PKP\core\JSONMessage;
use PKP\core\PKPRequest;
use PKP\plugins\Hook;
use PKP\plugins\PluginRegistry;
use PKP\security\authorization\PKPSiteAccessPolicy;

class PageHandler extends Handler
{
    //
    // Implement template methods from PKPHandler
    //
    /**
     * @copydoc PKPHandler::authorize()
     */
    public function authorize($request, &$args, $roleAssignments)
    {
        $this->addPolicy(new PKPSiteAccessPolicy(
            $request,
            ['tasks', 'css'],
            PKPSiteAccessPolicy::SITE_ACCESS_ALL_ROLES
        ));

        $this->setEnforceRestrictedSite(false);
        return parent::authorize($request, $args, $roleAssignments);
    }


    //
    // Public operations
    //
    /**
     * Display the tasks component
     *
     * @param array $args
     * @param PKPRequest $request
     *
     * @return JSONMessage JSON object
     */
    public function tasks($args, $request)
    {
        $this->setupTemplate($request);
        $templateMgr = TemplateManager::getManager($request);
        return $templateMgr->fetchJson('controllers/page/tasks.tpl');
    }

    /**
     * Get the compiled CSS
     *
     * @param array $args
     * @param PKPRequest $request
     */
    public function css($args, $request)
    {
        header('Content-Type: text/css');

        $templateManager = TemplateManager::getManager($request);

        $name = $request->getUserVar('name');
        if (empty($name)) {
            $name = 'pkp-lib';
        }
        switch ($name) {
            // The core app stylesheet
            case 'pkp-lib':
                $cachedFile = $templateManager->getCachedLessFilePath($name);
                if (!file_exists($cachedFile)) {
                    $styles = $templateManager->compileLess($name, 'styles/index.less');
                    if (!$templateManager->cacheLess($cachedFile, $styles)) {
                        echo $styles;
                        exit;
                    }
                }
                break;

            default:

                // Backwards compatibility. This hook is deprecated.
                if (Hook::getHooks('PageHandler::displayCss')) {
                    $result = '';
                    $lastModified = null;
                    Hook::call('PageHandler::displayCss', [$request, &$name, &$result, &$lastModified]);
                    if ($lastModified) {
                        header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $lastModified) . ' GMT');
                    }
                    header('Content-Length: ' . strlen($result));
                    echo $result;
                    exit;
                } else {
                    $cachedFile = $templateManager->getCachedLessFilePath($name);
                    if (!file_exists($cachedFile)) {
                        // Process styles registered with the current theme
                        $styles = '';
                        $themes = PluginRegistry::loadCategory('themes', true);
                        foreach ($themes as $theme) {
                            if ($theme->isActive()) {
                                $style = $theme->getStyle($name);
                                if (!empty($style)) {
                                    // Compile and cache the stylesheet
                                    $styles = $templateManager->compileLess(
                                        $name,
                                        $style['style'],
                                        [
                                            'baseUrl' => $style['baseUrl'] ?? null,
                                            'addLess' => $style['addLess'] ?? null,
                                            'addLessVariables' => $style['addLessVariables'] ?? null,
                                        ]
                                    );
                                }
                                break;
                            }
                        }

                        // If we still haven't found styles, fire off a hook
                        // which allows other types of plugins to handle
                        // requests
                        if (!$styles) {
                            Hook::call(
                                'PageHandler::getCompiledLess',
                                [
                                    'request' => $request,
                                    'name' => &$name,
                                    'styles' => &$styles,
                                ]
                            );
                        }

                        // Give up if there are still no styles
                        if (!$styles) {
                            exit;
                        }

                        // Try to save the styles to a cached file. If we can't,
                        // just print them out
                        if (!$templateManager->cacheLess($cachedFile, $styles)) {
                            echo $styles;
                            exit;
                        }
                    }
                }
                break;
        }

        // Deliver the cached file
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s', filemtime($cachedFile)) . ' GMT');
        header('Content-Length: ' . filesize($cachedFile));
        readfile($cachedFile);
        exit;
    }
}


if (!PKP_STRICT_MODE) {
    class_alias('\PKP\controllers\page\PageHandler', '\PageHandler');
}