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114 lines
6.1 KiB
Diff
114 lines
6.1 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 a6259e9160f291cf527a4ea5533a2e5530471874..3b8a7b9bdd2445afa93e4f2dc971a1d252c1463a 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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@@ -49,7 +49,7 @@ public class GiveCommand {
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if (flag && itemstack.isEmpty()) {
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itemstack.setCount(1);
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- entityitem = entityplayer.drop(itemstack, false);
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+ entityitem = entityplayer.drop(itemstack, false, false, true); // Paper - Fix duplicating /give items on item drop cancel
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if (entityitem != null) {
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entityitem.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 4817b8ab259d348b48bc325d34ba9351ffe951df..cfb9bd6b9863a0f6f0f50181b7553adce90cfebe 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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@@ -639,7 +639,14 @@ 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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- if (stack.isEmpty()) {
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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 itemstack, boolean flag, boolean flag1, boolean alwaysSucceed) {
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+ // Paper end
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+ if (itemstack.isEmpty()) {
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return null;
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} else {
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if (this.level.isClientSide) {
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@@ -647,17 +654,17 @@ public abstract class Player extends LivingEntity {
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}
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double d0 = this.getEyeY() - 0.30000001192092896D;
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- ItemEntity entityitem = new ItemEntity(this.level, this.getX(), d0, this.getZ(), stack);
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+ ItemEntity entityitem = new ItemEntity(this.level, this.getX(), d0, this.getZ(), itemstack);
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entityitem.setPickUpDelay(40);
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- if (retainOwnership) {
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+ if (flag1) {
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entityitem.setThrower(this.getUUID());
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}
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float f;
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float f1;
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- if (throwRandomly) {
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+ if (flag) {
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f = this.random.nextFloat() * 0.5F;
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f1 = this.random.nextFloat() * 6.2831855F;
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entityitem.setDeltaMovement((double) (-Mth.sin(f1) * f), 0.20000000298023224D, (double) (Mth.cos(f1) * f));
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@@ -680,12 +687,12 @@ 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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+ if (flag1 && (cur == null || cur.getAmount() == 0)) {
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// The complete stack was dropped
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player.getInventory().setItemInHand(drop.getItemStack());
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- } else if (retainOwnership && cur.isSimilar(drop.getItemStack()) && cur.getAmount() < cur.getMaxStackSize() && drop.getItemStack().getAmount() == 1) {
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+ } else if (flag1 && cur.isSimilar(drop.getItemStack()) && cur.getAmount() < cur.getMaxStackSize() && drop.getItemStack().getAmount() == 1) {
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// Only one item is dropped
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cur.setAmount(cur.getAmount() + 1);
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player.getInventory().setItemInHand(cur);
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@@ -697,9 +704,9 @@ public abstract class Player extends LivingEntity {
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}
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// CraftBukkit end
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// Paper start - remove player from map on drop
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- if (stack.getItem() == Items.FILLED_MAP) {
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- MapItemSavedData worldmap = MapItem.getOrCreateSavedData(stack, this.level);
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- worldmap.updateSeenPlayers(this, stack);
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+ if (itemstack.getItem() == Items.FILLED_MAP) {
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+ MapItemSavedData worldmap = MapItem.getOrCreateSavedData(itemstack, this.level);
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+ worldmap.updateSeenPlayers(this, itemstack);
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}
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// Paper end
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