Run callbacks based on validated inventory

3d_armor/api.lua

@@ -481,12 +481,28 @@ armor.save_armor_inventory = function(self, player)
 	if not name then
 		return
 	end
+	local armor_list = {}
+	local armor_list_string = player:get_attribute("3d_armor_inventory")
+	if armor_list_string then
+		for i, item in pairs(minetest.deserialize(armor_list_string)) do
+			armor_list[item] = item ~= "" and i or nil
+		end
+	end
+	-- Workaround for detached inventory swap exploit
 	local elements = {}
 	local player_inv = player:get_inventory()
 	for i = 1, 6 do
 		local stack = inv:get_stack("armor", i)
-		local element = self:get_element(stack:get_name())
+		if stack:get_count() > 0 then
+			local item = stack:get_name()
+			local element = self:get_element(item)
 			if element and not elements[element] then
+				if armor_list[item] then
+					armor_list[item] = nil
+				else
+					-- Item was not in previous inventory
+					armor:run_callbacks("on_equip", player, i, stack)
+				end
 				elements[element] = true;
 			else
 				inv:remove_item("armor", stack)
@@ -495,6 +511,12 @@ armor.save_armor_inventory = function(self, player)
 				end
 			end
 		end
+	end
+	for item, i in pairs(armor_list) do
+		local stack = ItemStack(item)
+		-- Previous item is not in current inventory
+		armor:run_callbacks("on_unequip", player, i, stack)
+	end
 	player:set_attribute("3d_armor_inventory",
 		self:serialize_inventory_list(inv:get_list("armor")))
 end

3d_armor/init.lua

@@ -118,12 +118,10 @@ local function init_player_armor(player)
 	local armor_inv = minetest.create_detached_inventory(name.."_armor", {
 		on_put = function(inv, listname, index, stack, player)
 			armor:save_armor_inventory(player)
-			armor:run_callbacks("on_equip", player, index, stack)
 			armor:set_player_armor(player)
 		end,
 		on_take = function(inv, listname, index, stack, player)
 			armor:save_armor_inventory(player)
-			armor:run_callbacks("on_unequip", player, index, stack)
 			armor:set_player_armor(player)
 		end,
 		on_move = function(inv, from_list, from_index, to_list, to_index, count, player)
@@ -132,11 +130,9 @@ local function init_player_armor(player)
 		end,
 		allow_put = function(inv, listname, index, put_stack, player)
 			local element = armor:get_element(put_stack:get_name())
-
 			if not element then
 				return 0
 			end
-
 			for i = 1, 6 do
 				local stack = inv:get_stack("armor", i)
 				local def = stack:get_definition() or {}
@@ -167,8 +163,10 @@ local function init_player_armor(player)
 	end
 	for i=1, 6 do
 		local stack = armor_inv:get_stack("armor", i)
+		if stack:get_count() > 0 then
 			armor:run_callbacks("on_equip", player, i, stack)
 		end
+	end
 	armor.def[name] = {
 		init_time = minetest.get_gametime(),
 		level = 0,