2 files changed, 21 insertions, 0 deletions
diff --git a/boot.php b/boot.php
index af395f30b..d5afbb855 100755
--- a/boot.php
+++ b/boot.php
@@ -358,6 +358,11 @@ define ( 'MAX_LIKERS',    10);
 
 define ( 'ZCURL_TIMEOUT' , (-1));
 
+/**
+ * Hours before chat lines are deleted
+ */
+
+define ( 'MAX_CHATROOM_HOURS' , 36);
 
 /**
  * email notification options
diff --git a/include/chat.php b/include/chat.php
index 4c79319ee..9d2341dfa 100644
--- a/include/chat.php
+++ b/include/chat.php
@@ -152,6 +152,8 @@ function chatroom_enter($observer_xchan,$room_id,$status,$client) {
 		dbesc($status),
 		dbesc($client)
 	);
+	
+	chatroom_flush($room_id,$xchan);
 	return $r;
 }
 
@@ -224,5 +226,19 @@ function chat_message($uid,$room_id,$xchan,$text) {
 	);
 
 	$ret['success'] = true;
+	chatroom_flush($room_id,$xchan);
 	return $ret;
 }
+
+/**
+ * Reduces the number of lines shown in chat by removing those older than MAX_CHATROOM_HOURS
+ */
+
+function chatroom_flush($room_id,$xchan) {
+	$date_limit = date('Y-m-d H:i:s', time() - 3600 * MAX_CHATROOM_HOURS);
+	$d = q("delete from chat where chat_room = %d and chat_xchan = '%s' and created < '%s'",
+		intval($room_id),
+		dbesc($xchan),
+		datetime_convert('','', $date_limit));
+	return true;
+}