hook_cron.php

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<?php
function sanitycheck_hook_cron(&$croninfo)
{
    assert('is_array($croninfo)');
    assert('array_key_exists("summary", $croninfo)');
    assert('array_key_exists("tag", $croninfo)');

    SimpleSAML\Logger::info('cron [sanitycheck]: Running cron in cron tag [' . $croninfo['tag'] . '] ');

    try {
        $sconfig = SimpleSAML_Configuration::getOptionalConfig('config-sanitycheck.php');

        $cronTag = $sconfig->getString('cron_tag', null);
        if ($cronTag === null || $cronTag !== $croninfo['tag']) {
            return;
        }

        $info = array();
        $errors = array();
        $hookinfo = array(
            'info' => &$info,
            'errors' => &$errors,
        );

        SimpleSAML\Module::callHooks('sanitycheck', $hookinfo);

        if (count($errors) > 0) {
            foreach ($errors AS $err) {
                $croninfo['summary'][] = 'Sanitycheck error: ' . $err;
            }
        }

    } catch (Exception $e) {
        $croninfo['summary'][] = 'Error executing sanity check: ' . $e->getMessage();
    }
}