hook_cron.php

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

        $oauthconfig = SimpleSAML_Configuration::getOptionalConfig('module_statistics.php');
        
        if (is_null($oauthconfig->getValue('cron_tag', 'hourly'))) return;
        if ($oauthconfig->getValue('cron_tag', NULL) !== $croninfo['tag']) return;
        
        try {
                $store = new sspmod_core_Storage_SQLPermanentStorage('oauth');
                $cleaned = $store->removeExpired();
                
#               if ($cleaned > 0) 
                        $croninfo['summary'][] = 'OAuth clean up. Removed ' . $cleaned . ' expired entries from OAuth storage.';
                
        } catch (Exception $e) {
                $message = 'OAuth clean up cron script failed: ' . $e->getMessage();
                SimpleSAML\Logger::warning($message);
                $croninfo['summary'][] = $message;
        }
}