Solved Clearing crafting slots/item on cursor to prevent inventory exploit

[Sophed]

How can I clear the player's crafting slots and item on cursor to prevent them from having specific items in places they shouldn't?

In the example below I use a common hack called 'Inventory Tweaks' (sometimes known as extra carry or inventory) which allows you to store items in your crafting slots/cursor and have them persist through closing your inventory. This is a huge issue as it is simple to create a mod with this feature and it would allow players to use items from multiple kits, unbalancing gameplay.

I have looked into replacing the inventory slots but I can't seem to find a method of achieving this as the crafting slots have IDs 1-4, the same as the player's regular inventory. player.inventory.clear() doesn't seem to clear the crafting slots or cursor, only the main inventory and armor slots.

 

[Nacio]

As far as the server is concerned the player always has their inventory open.
I guess try clearing those slots after the PlayerMoveEvent (not sure if that wouldn't also clear them when the player is moved by e.g. water).

 

[Sophed]

Updating this because I had to solve this same issue again recently

public static void clearCraftingGrid(Player player) {
    if (player.getOpenInventory().getTopInventory().getType() != InventoryType.CRAFTING) return;
    if (player.getOpenInventory().getTopInventory().getSize() > 5) return;
    player.getOpenInventory().getTopInventory().clear();
}