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depends.txt

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+xdecor?
+unified_inventory?

init.lua

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+hacktool = {}
+
+-- Are the optional dependencies enabled?
+local xdecor_enabled = minetest.get_modpath("xdecor")
+local unified_inventory_enabled = minetest.get_modpath("unified_inventory")
+local mailbox_enabled = minetest.get_modpath("mailbox")
+
+-- Build a list of inventories depening on the mods enabled
+local inventories = {{ label = "Main", name = "main" }}
+if xdecor_enabled then
+	table.insert(inventories, { label = "Ender", name = "enderchest" })
+end
+if mailbox_enabled then
+	table.insert(inventories, { label = "Mail", name = "mailbox" })
+end
+if unified_inventory_enabled then
+	for bag_i = 1, 4 do
+		table.insert(inventories, {
+			label = ("Bag %i"):format(bag_i),
+			name = ("bag%icontents"):format(bag_i)
+		})
+	end
+end
+
+-- Make the form wider if there are too many buttons
+local formspec_width = math.max(8, #inventories*2)
+
+-- Formspec contexts, to maintain the same target user while switching formspecs
+local contexts = {}
+local function get_target_player(user_name)
+	local context = contexts[user_name]
+	if not context then return end
+
+	local player = context.target
+	if not player or player:is_player() ~= true then return end
+
+	return player
+end
+
+-- Does str start with start, if so return everything else
+local function starts_with(str, start)
+	local len = #start
+	if str:sub(1, len) == start then
+		return str:sub(len+1)
+	end
+end
+
+-- Show the formspec for a given inventory to the given user
+local function show_formspec(user_name, inventory_name)
+
+	local player = get_target_player(user_name)
+	if not player then return end
+	
+	if not inventory_name then inventory_name = "main" end
+
+	minetest.show_formspec(
+		user_name,
+		"invhack.form",
+		hacktool.formspec(user_name, player, inventory_name)
+	)
+end
+
+-- Generate a formspec for the given inventory positioned at X, y
+local function inventory_formspec(name, inv, X, y)
+	if not y then y = 0 end
+	if not X then X = 0 end
+	local x = X
+	local formspec = ""
+	local size = inv:get_size(name)
+	for i = 1, size, 1 do
+		local stack = inv:get_stack(name, i)
+		local count = stack:get_count()
+		formspec = formspec .. ("item_image_button[%f,%f;1,1;%s;item:%s:%i;\n\n\b\b\b%s]"):format(
+				x, y,
+				stack:get_name(),
+				name, i,
+				count > 0 and tostring(count) or ""
+			)
+		x = x + 1
+		if x >= X + 8 then
+			x = X
+			y = y + 1
+		end
+	end
+	return formspec, y
+end
+
+-- Generate the entire formspec for this tool
+hacktool.formspec = function(user_name, player, inventory_name)
+	local formspec = ("size[8,5]")
+
+	for i, inv_def in ipairs(inventories) do
+		formspec = formspec .. ("button[%f,4.2;1,1;inventory:%s;%s]"):format((i - 1) * 1, inv_def.name, inv_def.label)
+	end
+
+	formspec = formspec .. inventory_formspec(inventory_name, player:get_inventory(), 0, 0)
+--formspec = formspec .. inventory_formspec(inventory_name, player:get_inventory(), (formspec_width - 8) / 1, 0)
+	return formspec
+end
+
+minetest.register_privilege("invhack", {
+	description = "Allows check sus players' inventories",
+	give_to_singleplayer = true,
+})
+
+-- Respond to a button press on the formspec
+minetest.register_on_player_receive_fields(function(user, form, pressed)
+	-- Not our concern, exit
+	if form ~= "invhack.form" then return end
+
+	local user_name = user:get_player_name()
+
+	-- Exit
+	if pressed.quit then
+		contexts[user_name] = nil
+		return
+	end
+
+	-- No privs, this should not happen, but might
+	if not minetest.check_player_privs(user_name, {invhack=true}) then
+		minetest.chat_send_player(user_name, "Missing privilege: invhack")
+		return
+	end
+
+	-- Check if target player exists
+	local player = get_target_player(user_name)
+	if not player then
+		contexts[user_name] = nil
+		minetest.chat_send_player(user_name, "The formspec context is empty or the player is offline")
+		return
+	end
+
+	-- Figure out which action is intended
+	local selected_inventory
+	local selected_item
+	for name,_ in pairs(pressed) do
+		selected_inventory = starts_with(name, "inventory:")
+		if selected_inventory then break end
+
+		selected_item = starts_with(name, "item:")
+		if selected_item then break end
+	end
+
+	-- Move an item from the target players inventory to the invhack user's inventory
+	if selected_item then
+		-- Split apart the button name to get the inventory and position
+		local separator_index = selected_item:find(":", 1, true)
+		local inventory_name = selected_item:sub(1, separator_index - 1)
+		local stack_index = tonumber(selected_item:sub(separator_index + 1))
+
+		-- Get the stack of the target player's inventory, if empty do nothing
+		local target_inventory = player:get_inventory()
+		local stack = target_inventory:get_stack(inventory_name, stack_index)
+		if stack:get_count() == 0 then
+			return
+		end
+
+		-- Find the first empty slot in the invhack user's inventory
+		local user_inventory = user:get_inventory()
+		local empty_slot = 0
+		local empty_found = false
+		for search_index = 1, 32, 1 do
+			empty_slot = search_index
+			if user_inventory:get_stack("main", search_index):get_count() == 0 then
+				empty_found = true
+				break
+			end
+		end
+
+		-- Warn them if their inventory is full
+		if not empty_found then
+			minetest.chat_send_player(user_name, "Error: Your inventory is full")
+			return
+		end
+
+		-- Move the item into the invhack user's inventory
+		user_inventory:set_stack("main", empty_slot, stack)
+		-- Remove the item from the target player's inventory
+		target_inventory:set_stack(inventory_name, stack_index, nil)
+		-- Trigger formspec reload - see below
+		selected_inventory = inventory_name
+	end
+
+	-- Switch the formspec to the selected inventory
+	if selected_inventory then
+		show_formspec(user_name, selected_inventory)
+	end
+end)
+
+minetest.register_tool("invhack:tool", {
+	description = "Inventory hack tool",
+	range = 15,
+	inventory_image = "hacktool_inv.png",
+	groups = {not_in_creative_inventory=1},
+	on_use = function(itemstack, user, pointed_thing)
+		local user_name = user:get_player_name()
+
+		if not minetest.check_player_privs(user_name, {invhack=true}) then
+			minetest.chat_send_player(user_name, "Missing privilege: invhack")
+			return
+		end
+
+		if pointed_thing.type ~= "object" then return end
+		local player = pointed_thing.ref
+		if player:is_player() == false then return end
+
+		contexts[user_name] = {target=player}
+
+		show_formspec(user_name)
+
+		return itemstack
+	end,
+})
+
+minetest.register_chatcommand("invhack", {
+  description = "View player's inventory",
+  params = "<playername>",
+  privs = {invhack=true},
+  func = function(name, param)
+local player = minetest.get_player_by_name(param)
+local user_name = name
+	contexts[user_name] = {target=player}
+	if not player then return end
+	
+	if not inventory_name then inventory_name = "main" end
+
+	minetest.show_formspec(
+		user_name,
+		"invhack.form",
+		hacktool.formspec(name, player, inventory_name)
+	)
+  end,
+})

mod.conf

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+name = invhack
+description = A player with the appropriate privilages can view and remove items from another player's inventory
+optional_depends = xdecor, unified_inventory, mailbox