local function get_inventory_auth_string(player, meta, pos, label)
	local name = player:get_player_name()
	local owner = meta:get_string("owner")
	local pos_str = minetest.pos_to_string(pos)
	return ("%s tried to access a locked %s belonging to %s at %s"):format(name, label, owner, pos_str)
end

local function has_locked_chest_privilege(meta, player)
	if player:get_player_name() ~= meta:get_string("owner") then
		return false
	end
	return true
end

local function get_allow_metadata_inventory_move(t)
	setmetatable(t, {__index={check_privs=has_locked_chest_privilege}})
	local label, check_privs = t[1], t.check_privs
	return function(pos, from_list, from_index, to_list, to_index, count, player)
		local meta = minetest.get_meta(pos)
		if not check_privs(meta, player) then
			minetest.log("action", get_inventory_auth_string(player, meta, pos, label))
			return 0
		end
		return count
	end
end

local function get_allow_metadata_inventory_put(t)
	setmetatable(t, {__index={check_privs=has_locked_chest_privilege}})
	local label, check_privs = t[1], t.check_privs
	return function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		if not check_privs(meta, player) then
			minetest.log("action", get_inventory_auth_string(player, meta, pos, label))
			return 0
		end
		return stack:get_count()
	end
end

local function get_allow_metadata_inventory_take(t)
	setmetatable(t, {__index={check_privs=has_locked_chest_privilege}})
	local label, check_privs = t[1], t.check_privs
	return function(pos, listname, index, stack, player)
		local meta = minetest.get_meta(pos)
		if not check_privs(meta, player) then
			minetest.log("action", get_inventory_auth_string(player, meta, pos, label))
			return 0
		end
		return stack:get_count()
	end
end

local function get_inventory_action_string(player, pos, action, label)
	local name = player:get_player_name()
	local pos_str = minetest.pos_to_string(pos)
	return ("%s moves stuff %s locked %s at %s"):format(name, action, label, pos_str)
end

local function get_on_metadata_inventory_move(label)
	return function(pos, from_list, from_index, to_list, to_index, count, player)
		minetest.log("action", get_inventory_action_string(player, pos, "in", label)
		)
	end
end

local function get_on_metadata_inventory_put(label)
	return function(pos, listname, index, stack, player)
		minetest.log("action", get_inventory_action_string(player, pos, "to", label))
	end
end

local function get_on_metadata_inventory_take(label)
	return function(pos, listname, index, stack, player)
		minetest.log("action", get_inventory_action_string(player, pos, "from", label))
	end
end


local actions = {
	has_locked_chest_privilege = has_locked_chest_privilege,
	get_allow_metadata_inventory_move = get_allow_metadata_inventory_move,
	get_allow_metadata_inventory_put = get_allow_metadata_inventory_put,
	get_allow_metadata_inventory_take = get_allow_metadata_inventory_take,
	get_on_metadata_inventory_move = get_on_metadata_inventory_move,
	get_on_metadata_inventory_put = get_on_metadata_inventory_put,
	get_on_metadata_inventory_take = get_on_metadata_inventory_take,
}
return actions