From 7f68d51e2b15a5cb5587a2bf379288bfe3ca8005 Mon Sep 17 00:00:00 2001
From: tenplus1 <kinsellaja@yahoo.com>
Date: Tue, 23 Aug 2022 08:32:52 +0100
Subject: [PATCH] chest names only use alphanumerical and spaces

---
 doors_chest.lua | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doors_chest.lua b/doors_chest.lua
index 2793b82..fa234a2 100644
--- a/doors_chest.lua
+++ b/doors_chest.lua
@@ -740,6 +740,11 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 
 	elseif fields.protect_name or fields.protect_rename then
 
+		if fields.protect_name ~= string.match(fields.protect_name, "[%w%s_-]+")
+		or fields.protect_name:len() > 35 then
+			return
+		end
+
 		-- change chest infotext to display name
 		if fields.protect_name ~= "" then