From cb51d78a27c2626515a29acb7aa89f2635693446 Mon Sep 17 00:00:00 2001
From: rubenwardy <rw@rubenwardy.com>
Date: Fri, 17 Jul 2020 00:44:34 +0100
Subject: [PATCH] Prevent players from putting class items in furnaces (#620)

---
 mods/ctf/ctf_classes/items.lua | 28 ++++++++++++++++++++++++++++
 mods/ctf/ctf_classes/mod.conf  |  2 +-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/mods/ctf/ctf_classes/items.lua b/mods/ctf/ctf_classes/items.lua
index dc76613..228b31a 100644
--- a/mods/ctf/ctf_classes/items.lua
+++ b/mods/ctf/ctf_classes/items.lua
@@ -1,3 +1,5 @@
+local S = minetest.get_translator("ctf")
+
 local function stack_list_to_map(stacks)
 	local map = {}
 	for i = 1, #stacks do
@@ -84,3 +86,29 @@ end
 dropondie.register_drop_filter(function(player, itemname)
 	return not is_class_blacklisted(player, itemname)
 end)
+
+
+local function protect_metadata_inventory(nodename)
+	local def = assert(minetest.registered_nodes[nodename])
+
+	local function wrap(defname)
+		local old = def[defname]
+		def[defname] = function(pos, listname, index, stack, player, ...)
+			if is_class_blacklisted(player, stack:get_name()) then
+				minetest.chat_send_player(player:get_player_name(),
+					S("You're not allowed to put class items in @1!", def.description or "?"))
+				return 0
+			end
+
+			return old(pos, listname, index, stack, player, ...)
+		end
+	end
+
+	wrap("allow_metadata_inventory_put")
+	wrap("allow_metadata_inventory_take")
+
+	minetest.register_node(":" .. nodename, def)
+end
+
+protect_metadata_inventory("furnace:furnace")
+protect_metadata_inventory("furnace:furnace_active")
diff --git a/mods/ctf/ctf_classes/mod.conf b/mods/ctf/ctf_classes/mod.conf
index cecd372..91d54a6 100644
--- a/mods/ctf/ctf_classes/mod.conf
+++ b/mods/ctf/ctf_classes/mod.conf
@@ -1,3 +1,3 @@
 name = ctf_classes
-depends = ctf, ctf_flag, ctf_colors, ctf_map_core, ctf_stats, ctf_bandages, physics, shooter, hpregen, give_initial_stuff, dropondie, crafting, sniper_rifles, grenades
+depends = ctf, ctf_flag, ctf_colors, ctf_map_core, ctf_stats, ctf_bandages, physics, shooter, hpregen, give_initial_stuff, dropondie, crafting, sniper_rifles, grenades, furnace
 description = Adds classes, including knight, shooter, and medic