From e013d86b56891319346472b5ef5d9469b208469b Mon Sep 17 00:00:00 2001
From: Shish <shish@shishnet.org>
Date: Sun, 3 Mar 2013 18:32:56 +0000
Subject: [PATCH] disallow aliases to other aliases

---
 ext/alias_editor/main.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ext/alias_editor/main.php b/ext/alias_editor/main.php
index 7ba38656..4034fda8 100644
--- a/ext/alias_editor/main.php
+++ b/ext/alias_editor/main.php
@@ -108,6 +108,9 @@ class AliasEditor extends Extension {
 		if($database->get_row("SELECT * FROM aliases WHERE oldtag=:oldtag AND lower(newtag)=lower(:newtag)", $pair)) {
 			throw new AddAliasException("That alias already exists");
 		}
+		else if($database->get_row("SELECT * FROM aliases WHERE oldtag=:newtag", $pair)) {
+			throw new AddAliasException("{$event->newtag} is itself an alias");
+		}
 		else {
 			$database->execute("INSERT INTO aliases(oldtag, newtag) VALUES(:oldtag, :newtag)", $pair);
 			log_info("alias_editor", "Added alias for {$event->oldtag} -> {$event->newtag}", true);