Option to reset thread `bump` after last post deleted.

inc/config.php

@@ -222,6 +222,9 @@
 
 	// Skip checking certain IP addresses against blacklists (for troubleshooting or whatever)
 	$config['dnsbl_exceptions'][] = '127.0.0.1';
+	
+	// To prevent bump atacks; returns the thread to last position after the last post is deleted. 
+	$config['anti_bump_flood'] = false;
 
 	/*
 	 * Introduction to Tinyboard's spam filter:

inc/functions.php

@@ -1227,7 +1227,8 @@ function deletePost($id, $error_if_doesnt_exist=true, $rebuild_after=true) {
 	// Delete posts and maybe replies
 	while ($post = $query->fetch(PDO::FETCH_ASSOC)) {
 		event('delete', $post);
-		
+
+		$thread_id = $post['thread'];
 		if (!$post['thread']) {
 			// Delete thread HTML page
 			file_unlink($board['dir'] . $config['dir']['res'] . link_for($post) );
@@ -1279,6 +1280,18 @@ function deletePost($id, $error_if_doesnt_exist=true, $rebuild_after=true) {
 	$query->bindValue(':board', $board['uri']);
 	$query->execute() or error(db_error($query));
 	
+	if ($config['anti_bump_flood']) {
+                $query = prepare(sprintf("SELECT `time` FROM ``posts_%s`` WHERE (`thread` = :thread OR `id` = :thread) AND `sage` = 0 ORDER BY `time` DESC LIMIT 1", $board['uri']));
+                $query->bindValue(':thread', $thread_id);
+                $query->execute() or error(db_error($query));
+                $bump = $query->fetchColumn();
+
+                $query = prepare(sprintf("UPDATE ``posts_%s`` SET `bump` = :bump WHERE `id` = :thread", $board['uri']));
+                $query->bindValue(':bump', $bump);
+                $query->bindValue(':thread', $thread_id);
+                $query->execute() or error(db_error($query));
+	}
+	
 	if (isset($rebuild) && $rebuild_after) {
 		buildThread($rebuild);
 		buildIndex();