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71 lines
4.0 KiB
Diff
71 lines
4.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Alphaesia <creepashadowz@gmail.com>
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Date: Fri, 23 Apr 2021 09:57:56 +1200
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Subject: [PATCH] Fix duplicating /give items on item drop cancel
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Fixes SPIGOT-2942 (Give command fires PlayerDropItemEvent, cancelling it causes item duplication).
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For every stack of items to give, /give puts the item stack straight
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into the player's inventory. However, it also summons a "fake item"
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at the player's location. When the PlayerDropItemEvent for this fake
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item is cancelled, the server attempts to put the item back into the
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player's inventory. The result is that the fake item, which is never
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meant to be obtained, is combined with the real items injected directly
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into the player's inventory. This means more items than the amount
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specified in /give are given to the player - one for every stack of
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items given. (e.g. /give @s dirt 1 gives you 2 dirt).
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While this isn't a big issue for general building usage, it can affect
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e.g. adventure maps where the number of items the player receives is
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important (and you want to restrict the player from throwing items).
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If there are any overflow items that didn't make it into the inventory
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(insufficient space), those items are dropped as a real item instead
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of a fake one. While cancelling this drop would also result in the
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server attempting to put those items into the inventory, since it is
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full this has no effect.
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Just ignoring cancellation of the PlayerDropItemEvent seems like the
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cleanest and least intrusive way to fix it.
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diff --git a/src/main/java/net/minecraft/server/commands/GiveCommand.java b/src/main/java/net/minecraft/server/commands/GiveCommand.java
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index 58941830a4bd024fcdb97df47783c82062e9167f..a0dc380e90415de9068ea408d62a1605c82631df 100644
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--- a/src/main/java/net/minecraft/server/commands/GiveCommand.java
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+++ b/src/main/java/net/minecraft/server/commands/GiveCommand.java
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@@ -47,7 +47,7 @@ public class GiveCommand {
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boolean bl = serverPlayer.getInventory().add(itemStack);
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if (bl && itemStack.isEmpty()) {
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itemStack.setCount(1);
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- ItemEntity itemEntity2 = serverPlayer.drop(itemStack, false);
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+ ItemEntity itemEntity2 = serverPlayer.drop(itemStack, false, false, true); // Paper - Fix duplicating /give items on item drop cancel
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if (itemEntity2 != null) {
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itemEntity2.makeFakeItem();
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}
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diff --git a/src/main/java/net/minecraft/world/entity/player/Player.java b/src/main/java/net/minecraft/world/entity/player/Player.java
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index e9db4d972abfd7807137e32abc8b1096be4776b5..a84cec9d66a00ef647b0d3bb24879706b97bf9b2 100644
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--- a/src/main/java/net/minecraft/world/entity/player/Player.java
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+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
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@@ -685,6 +685,13 @@ public abstract class Player extends LivingEntity {
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@Nullable
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public ItemEntity drop(ItemStack stack, boolean throwRandomly, boolean retainOwnership) {
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+ // Paper start - Fix duplicating /give items on item drop cancel
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+ return this.drop(stack, throwRandomly, retainOwnership, false);
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+ }
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+
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+ @Nullable
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+ public ItemEntity drop(ItemStack stack, boolean throwRandomly, boolean retainOwnership, boolean alwaysSucceed) {
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+ // Paper end
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if (stack.isEmpty()) {
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return null;
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} else {
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@@ -726,7 +733,7 @@ public abstract class Player extends LivingEntity {
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PlayerDropItemEvent event = new PlayerDropItemEvent(player, drop);
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this.level.getCraftServer().getPluginManager().callEvent(event);
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- if (event.isCancelled()) {
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+ if (event.isCancelled() && !alwaysSucceed) { // Paper - Fix duplicating /give items on item drop cancel
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org.bukkit.inventory.ItemStack cur = player.getInventory().getItemInHand();
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if (retainOwnership && (cur == null || cur.getAmount() == 0)) {
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// The complete stack was dropped
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