File zp-extensions/check_for_update.php

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<?php
/**
 * Provides a check for more recent Zenphoto Versions.
 *
 * @author Stephen Billard (sbillard)
 * @package plugins
 * @subpackage check-for-update
 */
$plugin_is_filter = 5 | ADMIN_PLUGIN;
$plugin_description = gettext("Checks if there is a Zenphoto versions that is newer than the installed version.");
$plugin_author = "Stephen Billard (sbillard)";
$plugin_category = gettext('Admin');
$plugin_disable = (!class_exists('DOMDocument')) ? gettext('PHP <em>DOM Object Model</em> is required.') : false;

if (!$plugin_disable) {
    if (OFFSET_PATH == 2) {
        if (TEST_RELEASE) {
            enableExtension('check_for_release', $plugin_is_filter);
        }
    } else {
        $me = explode('?', getRequestURI());
        if (basename(array_shift($me)) == 'admin.php') {
            $v = getOption('last_update_version');
            $last = getOption('last_update_check');
            if (empty($last) || is_numeric($last)) {
                if (time() > $last + 1728000) {
                    //  check each 20 days
                    $v = checkForUpdate();
                    setOption('last_update_check', time());
                    setOption('last_update_version', $v);
                    if ($v) {
                        setOption('last_update_msg', '<a href="http://www.zenphoto.org" alt="' . gettext('Zenphoto download page') . '">' . gettext("A new version of Zenphoto version is available.") . '</a>');
                    }
                }
            }
            if ($v) {
                zp_register_filter('admin_note', 'admin_showupdate');
            }
        }
    }
}

/**
 * Searches the zenphoto.org home page for the current zenphoto download
 * locates the version number of the download and compares it to the version
 * we are running.
 *
 * @return string If there is a more current version on the WEB, returns its version number otherwise returns FALSE
 * @since 1.1.3
 */
function checkForUpdate() {
    $webVersion = false;
    if (is_connected() && class_exists('DOMDocument')) {
        require_once(dirname(__FILE__) . '/zenphoto_news/rsslib.php');
        $recents = RSS_Retrieve("http://www.zenphoto.org/index.php?rss=news&category=changelog");
        if ($recents) {
            array_shift($recents);
            $article = array_shift($recents); //    most recent changelog article
            $v = trim(str_replace('zenphoto-', '', basename($article['link'])));
            $c = explode('-', ZENPHOTO_VERSION);
            $c = array_shift($c);
            if ($v && version_compare($c, $v, "<")) {
                $webVersion = $v;
            }
        }
    }
    return $webVersion;
}

/**
 *
 * Displays the "new version available" message on admin pages
 * @param unknown_type$tab
 * @param unknown_type $subtab
 */
function admin_showupdate($tab, $subtab) {
    ?>
    <div class="notebox">
        <h2><a href="http://www.zenphoto.org" alt="<?php echo gettext('Zenphoto download page'); ?>"><?php echo gettext("A new version of Zenphoto version is available."); ?></a></h2>
    </div>
    <?php
    setOption('last_update_check', time());
    return $tab;
}
?>

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