<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  Quickicon.Joomlaupdate
 *
 * @copyright   (C) 2011 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Plugin\Quickicon\Joomlaupdate\Extension;

\defined('_JEXEC') or die;

use Joomla\CMS\Document\Document;
use Joomla\CMS\Extension\ExtensionHelper;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Session\Session;
use Joomla\CMS\Uri\Uri;
use Joomla\Event\DispatcherInterface;
use Joomla\Event\SubscriberInterface;
use Joomla\Module\Quickicon\Administrator\Event\QuickIconsEvent;

/**
 * Joomla! update notification plugin
 *
 * @since  2.5
 */
class Joomlaupdate extends CMSPlugin implements SubscriberInterface
{
	/**
	 * Load the language file on instantiation.
	 *
	 * @var    boolean
	 * @since  3.1
	 */
	protected $autoloadLanguage = true;

	/**
	 * Application object.
	 *
	 * @var    \Joomla\CMS\Application\CMSApplication
	 * @since  3.7.0
	 */
	protected $app;

	/**
	 * The document.
	 *
	 * @var Document
	 *
	 * @since  4.0.0
	 */
	private $document;

	/**
	 * Returns an array of events this subscriber will listen to.
	 *
	 * @return  array
	 *
	 * @since   4.0.0
	 */
	public static function getSubscribedEvents(): array
	{
		return [
			'onGetIcons' => 'getCoreUpdateNotification',
		];
	}

	/**
	 * Constructor
	 *
	 * @param   DispatcherInterface  $subject   The object to observe
	 * @param   Document             $document  The document
	 * @param   array                $config    An optional associative array of configuration settings.
	 *                                          Recognized key values include 'name', 'group', 'params', 'language'
	 *                                          (this list is not meant to be comprehensive).
	 *
	 * @since   4.0.0
	 */
	public function __construct($subject, Document $document, $config = array())
	{
		parent::__construct($subject, $config);

		$this->document = $document;
	}

	/**
	 * This method is called when the Quick Icons module is constructing its set
	 * of icons. You can return an array which defines a single icon and it will
	 * be rendered right after the stock Quick Icons.
	 *
	 * @param   QuickIconsEvent  $event  The event object
	 *
	 * @return  void
	 *
	 * @since   4.0.0
	 */
	public function getCoreUpdateNotification(QuickIconsEvent $event)
	{
		$context = $event->getContext();

		if ($context !== $this->params->get('context', 'update_quickicon') || !$this->app->getIdentity()->authorise('core.manage', 'com_installer'))
		{
			return;
		}

		Text::script('PLG_QUICKICON_JOOMLAUPDATE_ERROR');
		Text::script('PLG_QUICKICON_JOOMLAUPDATE_UPDATEFOUND');
		Text::script('PLG_QUICKICON_JOOMLAUPDATE_UPTODATE');
		Text::script('MESSAGE');
		Text::script('ERROR');
		Text::script('INFO');
		Text::script('WARNING');

		$this->document->addScriptOptions(
			'js-joomla-update',
			[
				'url'     => Uri::base() . 'index.php?option=com_joomlaupdate',
				'ajaxUrl' => Uri::base() . 'index.php?option=com_installer&view=update&task=update.ajax&'
					. Session::getFormToken() . '=1&eid=' . ExtensionHelper::getExtensionRecord('joomla', 'file')->extension_id,
				'version' => JVERSION,
			]
		);

		$this->document->getWebAssetManager()
			->registerAndUseScript('plg_quickicon_joomlaupdate', 'plg_quickicon_joomlaupdate/jupdatecheck.min.js', [], ['defer' => true], ['core']);

		// Add the icon to the result array
		$result = $event->getArgument('result', []);

		$result[] = [
			[
				'link'  => 'index.php?option=com_joomlaupdate',
				'image' => 'icon-joomla',
				'icon'  => '',
				'text'  => Text::_('PLG_QUICKICON_JOOMLAUPDATE_CHECKING'),
				'id'    => 'plg_quickicon_joomlaupdate',
				'group' => 'MOD_QUICKICON_MAINTENANCE',
			],
		];

		$event->setArgument('result', $result);
	}
}

• [F] Joomlaupdate.php
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