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<?php class wfScanMonitor { const CRON_INTERVAL_NAME = 'wf_scan_monitor_interval'; const CRON_INTERVAL_AMOUNT = 60; //Seconds const CRON_HOOK = 'wf_scan_monitor'; const CONFIG_LAST_ATTEMPT = 'scanMonitorLastAttempt'; const CONFIG_LAST_ATTEMPT_WAS_FORK = 'scanMonitorLastAttemptWasFork'; const CONFIG_LAST_ATTEMPT_MODE = 'scanMonitorLastAttemptMode'; const CONFIG_LAST_SUCCESS = 'scanMonitorLastSuccess'; const CONFIG_MAX_RESUME_ATTEMPTS = 'scan_max_resume_attempts'; const CONFIG_REMAINING_RESUME_ATTEMPTS = 'scanMonitorRemainingResumeAttempts'; const DEFAULT_RESUME_ATTEMPTS = 2; const MAX_RESUME_ATTEMPTS = 5; const SCAN_START_TIMEOUT = 30; //Seconds public static function beginMonitoring() { if (wp_next_scheduled(self::CRON_HOOK)) return; wp_schedule_event(time(), self::CRON_INTERVAL_NAME, self::CRON_HOOK); } public static function endMonitoring() { $timestamp = wp_next_scheduled(self::CRON_HOOK); if ($timestamp !== false) wp_unschedule_event($timestamp, self::CRON_HOOK); } public static function validateResumeAttempts($attempts, &$valid = null) { if ($attempts < 0 || $attempts > self::MAX_RESUME_ATTEMPTS) { $valid = false; return self::DEFAULT_RESUME_ATTEMPTS; } $valid = true; return $attempts; } private static function setRemainingResumeAttempts($attempts) { wfConfig::set(self::CONFIG_REMAINING_RESUME_ATTEMPTS, $attempts); } public static function getConfiguredResumeAttempts() { $attempts = (int) wfConfig::get(self::CONFIG_MAX_RESUME_ATTEMPTS, self::DEFAULT_RESUME_ATTEMPTS); return self::validateResumeAttempts($attempts); } private static function resetResumeAttemptCounter() { $attempts = self::getConfiguredResumeAttempts(); self::setRemainingResumeAttempts($attempts); return $attempts; } private static function getRemainingResumeAttempts() { $attempts = (int) wfConfig::get(self::CONFIG_REMAINING_RESUME_ATTEMPTS, 0); return self::validateResumeAttempts($attempts); } public static function handleScanStart($mode) { wfConfig::set(self::CONFIG_LAST_ATTEMPT_MODE, $mode); $maxAttempts = self::resetResumeAttemptCounter(); if ($maxAttempts > 0) self::beginMonitoring(); } public static function monitorScan() { $remainingAttempts = self::getRemainingResumeAttempts(); if ($remainingAttempts > 0) { $now = time(); $lastAttempt = wfConfig::get(self::CONFIG_LAST_ATTEMPT); if ($lastAttempt === null || $now - $lastAttempt < self::SCAN_START_TIMEOUT) return; $lastSuccess = wfConfig::get(self::CONFIG_LAST_SUCCESS); self::setRemainingResumeAttempts(--$remainingAttempts); if ($lastSuccess === null || $lastAttempt > $lastSuccess) { wordfence::status(2, 'info', sprintf(__('Attempting to resume scan stage (%d attempt(s) remaining)...', 'wordfence'), $remainingAttempts)); self::resumeScan(); } } else { self::endMonitoring(); } } private static function resumeScan() { $mode = wfConfig::get(self::CONFIG_LAST_ATTEMPT_MODE); if (!wfScanner::isValidScanType($mode)) $mode = false; wfScanEngine::startScan(wfConfig::get(self::CONFIG_LAST_ATTEMPT_WAS_FORK), $mode, true); } private static function logTimestamp($key) { wfConfig::set($key, time()); } public static function logLastAttempt($fork) { self::logTimestamp(self::CONFIG_LAST_ATTEMPT); wfConfig::set(self::CONFIG_LAST_ATTEMPT_WAS_FORK, $fork); } public static function logLastSuccess() { self::logTimestamp(self::CONFIG_LAST_SUCCESS); } public static function handleStageStart($fork) { if ($fork) self::resetResumeAttemptCounter(); } public static function registerCronInterval($schedules) { if (!array_key_exists(self::CRON_INTERVAL_NAME, $schedules)) { $schedules[self::CRON_INTERVAL_NAME] = array( 'interval' => self::CRON_INTERVAL_AMOUNT, 'display' => 'Wordfence Scan Monitor' ); } return $schedules; } public static function registerActions() { add_filter('cron_schedules', array(self::class, 'registerCronInterval')); add_action(self::CRON_HOOK, array(self::class, 'monitorScan')); } public static function handleDeactivation() { self::endMonitoring(); } }
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