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File: AnnouncementHandler.php
<?php

/**
 * @file pages/announcement/AnnouncementHandler.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class AnnouncementHandler
 *
 * @ingroup pages_announcement
 *
 * @brief Handle requests for public announcement functions.
 */

namespace PKP\pages\announcement;

use APP\core\Application;
use APP\core\Request;
use APP\facades\Repo;
use APP\handler\Handler;
use APP\template\TemplateManager;
use PKP\announcement\Collector;
use PKP\config\Config;
use PKP\core\PKPRequest;
use PKP\security\authorization\ContextRequiredPolicy;

class AnnouncementHandler extends Handler
{
    //
    // Public handler methods.
    //
    /**
     * Show public announcements page.
     *
     * @param array $args
     * @param PKPRequest $request
     */
    public function index($args, $request)
    {
        if (!$this->isAnnouncementsEnabled($request)) {
            $request->getDispatcher()->handle404();
        }

        $this->setupTemplate($request);

        $templateMgr = TemplateManager::getManager($request);
        $templateMgr->assign('announcementsIntroduction', $this->getAnnouncementsIntro($request));

        // TODO the announcements list should support pagination
        $collector = Repo::announcement()
            ->getCollector()
            ->filterByActive();

        if ($request->getContext()) {
            $collector->filterByContextIds([$request->getContext()->getId()]);
        } else {
            $collector->withSiteAnnouncements(Collector::SITE_ONLY);
        }

        $announcements = $collector->getMany();

        $templateMgr->assign('announcements', $announcements->toArray());
        $templateMgr->display('frontend/pages/announcements.tpl');
    }

    /**
     * View announcement details.
     *
     * @param array $args first parameter is the ID of the announcement to display
     * @param PKPRequest $request
     */
    public function view($args, $request)
    {
        if (!$this->isAnnouncementsEnabled($request)) {
            $request->getDispatcher()->handle404();
        }
        $this->validate();
        $this->setupTemplate($request);

        $announcementId = (int) array_shift($args);
        $announcement = Repo::announcement()->get($announcementId);
        if (
            $announcement
            && $announcement->getAssocType() == Application::getContextAssocType()
            && $announcement->getAssocId() == $request->getContext()?->getId()
            && (
                $announcement->getDateExpire() == null || strtotime($announcement->getDateExpire()) > time()
            )
        ) {
            $templateMgr = TemplateManager::getManager($request);
            $templateMgr->assign('announcement', $announcement);
            $templateMgr->assign('announcementTitle', $announcement->getLocalizedTitleFull());
            return $templateMgr->display('frontend/pages/announcement.tpl');
        }
        $request->redirect(null, 'announcement');
    }

    protected function isAnnouncementsEnabled(Request $request): bool
    {
        if (!Config::getVar('features', 'site_announcements') && !$request->getContext()) {
            return false;
        }

        $contextOrSite = $request->getContext() ?? $request->getSite();
        return $contextOrSite->getData('enableAnnouncements');
    }

    protected function getAnnouncementsIntro(Request $request): ?string
    {
        $contextOrSite = $request->getContext() ?? $request->getSite();
        return $contextOrSite->getLocalizedData('announcementsIntroduction');
    }
}