1 files changed, 121 insertions, 0 deletions
diff --git a/mod/logrotate/start.php b/mod/logrotate/start.php
new file mode 100644
index 000000000..28f14ad14
--- /dev/null
+++ b/mod/logrotate/start.php
@@ -0,0 +1,121 @@
+<?php
+/**
+ * Elgg log rotator.
+ *
+ * @package ElggLogRotate
+ */
+
+elgg_register_event_handler('init', 'system', 'logrotate_init');
+
+function logrotate_init() {
+	$period = elgg_get_plugin_setting('period', 'logrotate');
+	$delete = elgg_get_plugin_setting('delete', 'logrotate');
+	switch ($period) {
+		case 'weekly':
+		case 'monthly' :
+		case 'yearly' :
+			break;
+		default:
+			$period = 'monthly';
+	}
+
+	// Register cron hook for archival of logs
+	elgg_register_plugin_hook_handler('cron', $period, 'logrotate_archive_cron');
+	// Register cron hook for deletion of selected archived logs
+	elgg_register_plugin_hook_handler('cron', $delete, 'logrotate_delete_cron');
+}
+
+/**
+ * Trigger the log rotation.
+ */
+function logrotate_archive_cron($hook, $entity_type, $returnvalue, $params) {
+	$resulttext = elgg_echo("logrotate:logrotated");
+
+	$day = 86400;
+
+	$offset = 0;
+	$period = elgg_get_plugin_setting('period', 'logrotate');
+	switch ($period) {
+		case 'weekly':
+			$offset = $day * 7;
+			break;
+		case 'yearly':
+			$offset = $day * 365;
+			break;
+		case 'monthly':
+		default:
+			// assume 28 days even if a month is longer. Won't cause data loss.
+			$offset = $day * 28;
+	}
+
+	if (!archive_log($offset)) {
+		$resulttext = elgg_echo("logrotate:lognotrotated");
+	}
+
+	return $returnvalue . $resulttext;
+}
+
+/**
+ * Trigger the log deletion.
+ */
+function logrotate_delete_cron($hook, $entity_type, $returnvalue, $params) {
+	$resulttext = elgg_echo("logrotate:logdeleted");
+
+	$day = 86400;
+
+	$offset = 0;
+	$period = elgg_get_plugin_setting('delete', 'logrotate');
+	switch ($period) {
+		case 'weekly':
+			$offset = $day * 7;
+			break;
+		case 'yearly':
+			$offset = $day * 365;
+			break;
+		case 'monthly':
+		default:
+			// assume 28 days even if a month is longer. Won't cause data loss.
+			$offset = $day * 28;
+	}
+
+	if (!log_browser_delete_log($offset)) {
+		$resulttext = elgg_echo("logrotate:lognotdeleted");
+	}
+
+	return $returnvalue . $resulttext;
+}
+
+/**
+ * This function deletes archived copies of the system logs that are older than specified.
+ *
+ * @param int $time_of_delete An offset in seconds from now to delete (useful for log deletion)
+ */
+function log_browser_delete_log($time_of_delete) {
+	global $CONFIG;
+
+	$offset = (int)$time_of_delete;
+	$now = time();
+
+	$ts = $now - $offset;
+
+	$FLAG = 1;      
+	$result = mysql_query("SHOW TABLES like '{$CONFIG->dbprefix}system_log_%'");
+	while ($showtablerow = mysql_fetch_array($result)) {
+		//To obtain time of archival
+		$log_time = explode("{$CONFIG->dbprefix}system_log_", $showtablerow[0]);
+		if ($log_time < $ts) {
+			//If the time of archival is before the required offset then delete
+			if (!mysql_query("DROP TABLE $showtablerow[0]")) {
+				$FLAG = 0;
+			}	
+		}
+	}
+
+	//Check if the appropriate tables have been deleted and return true if yes
+	if ($FLAG) {
+		return true;
+	} else {
+		return false;
+	}
+
+}