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Paper/patches/server/0573-Add-PlayerTradeEvent-and-PlayerPurchaseEvent.patch

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fixes cancelling PlayerTradeEvent (#5612)
2021-09-23 06:10:35 +02:00
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 2 Jul 2020 16:12:10 -0700
Subject: [PATCH] Add PlayerTradeEvent and PlayerPurchaseEvent
Co-authored-by: Alexander <protonull@protonmail.com>
diff --git a/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java b/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
index 4a7b657265cbbc91ae85409abb3db29cfc555a2c..c75fa3274dedfafa11b94704695a2313f11c22cc 100644
--- a/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
+++ b/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
@@ -138,11 +138,24 @@ public abstract class AbstractVillager extends AgeableMob implements InventoryCa
@Override
public void overrideXp(int experience) {}
+ // Paper start
+ @Override
+ public void processTrade(MerchantOffer recipe, io.papermc.paper.event.player.PlayerPurchaseEvent event) { // The MerchantRecipe passed in here is the one set by the PlayerPurchaseEvent
+ if (event.willIncreaseTradeUses()) {
+ recipe.increaseUses();
+ }
+ if (event.isRewardingExp()) {
+ this.rewardTradeXp(recipe);
+ }
+ this.notifyTrade(recipe);
+ }
+ // Paper end
+
@Override
public void notifyTrade(MerchantOffer offer) {
- offer.increaseUses();
+ // offer.increaseUses(); // Paper - handled in processTrade
this.ambientSoundTime = -this.getAmbientSoundInterval();
- this.rewardTradeXp(offer);
+ // this.rewardTradeXp(offer); // Paper - handled in processTrade
if (this.tradingPlayer instanceof ServerPlayer) {
CriteriaTriggers.TRADE.trigger((ServerPlayer) this.tradingPlayer, this, offer.getResult());
}
diff --git a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
index 60a67f75b4f772654e064e2b19f68a907ca4c93b..83d9fe7d92a8cb46478964d0742d0103a937648c 100644
--- a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
@@ -741,6 +741,14 @@ public abstract class AbstractContainerMenu {
public abstract boolean stillValid(Player player);
protected boolean moveItemStackTo(ItemStack stack, int startIndex, int endIndex, boolean fromLast) {
+ // Paper start
+ return this.moveItemStackTo(stack, startIndex, endIndex, fromLast, false);
+ }
+ protected boolean moveItemStackTo(ItemStack stack, int startIndex, int endIndex, boolean fromLast, boolean isCheck) {
+ if (isCheck) {
+ stack = stack.copy();
+ }
+ // Paper end
boolean flag1 = false;
int k = startIndex;
@@ -763,18 +771,27 @@ public abstract class AbstractContainerMenu {
slot = (Slot) this.slots.get(k);
itemstack1 = slot.getItem();
+ // Paper start - clone if only a check
+ if (isCheck) {
+ itemstack1 = itemstack1.copy();
+ }
+ // Paper end
if (!itemstack1.isEmpty() && ItemStack.isSameItemSameTags(stack, itemstack1)) {
int l = itemstack1.getCount() + stack.getCount();
if (l <= stack.getMaxStackSize()) {
stack.setCount(0);
itemstack1.setCount(l);
+ if (!isCheck) { // Paper - dont update if only a check
slot.setChanged();
+ } // Paper
flag1 = true;
} else if (itemstack1.getCount() < stack.getMaxStackSize()) {
stack.shrink(stack.getMaxStackSize() - itemstack1.getCount());
itemstack1.setCount(stack.getMaxStackSize());
+ if (!isCheck) { // Paper - dont update if only a check
slot.setChanged();
+ } // Paper
flag1 = true;
}
}
@@ -805,14 +822,33 @@ public abstract class AbstractContainerMenu {
slot = (Slot) this.slots.get(k);
itemstack1 = slot.getItem();
+ // Paper start - clone if only a check
+ if (isCheck) {
+ itemstack1 = itemstack1.copy();
+ }
+ // Paper end
if (itemstack1.isEmpty() && slot.mayPlace(stack)) {
if (stack.getCount() > slot.getMaxStackSize()) {
+ // Paper start - dont set slot if only check
+ if (isCheck) {
+ stack.shrink(slot.getMaxStackSize());
+ } else {
+ // Paper end
slot.set(stack.split(slot.getMaxStackSize()));
+ } // Paper
} else {
+ // Paper start - dont set slot if only check
+ if (isCheck) {
+ stack.shrink(stack.getCount());
+ } else {
+ // Paper end
slot.set(stack.split(stack.getCount()));
+ } // Paper
}
+ if (!isCheck) { // Paper - dont update if only check
slot.setChanged();
+ } // Paper
flag1 = true;
break;
}
diff --git a/src/main/java/net/minecraft/world/inventory/MerchantMenu.java b/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
index dc036f6450b2eccdc848c66dac525ed43f70f4e4..549c13180fbbebce73771a8d82eb040f1b4fc605 100644
--- a/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
@@ -134,12 +134,12 @@ public class MerchantMenu extends AbstractContainerMenu {
itemstack = itemstack1.copy();
if (index == 2) {
- if (!this.moveItemStackTo(itemstack1, 3, 39, true)) {
+ if (!this.moveItemStackTo(itemstack1, 3, 39, true, true)) { // Paper
return ItemStack.EMPTY;
}
- slot.onQuickCraft(itemstack1, itemstack);
- this.playTradeSound();
+ // slot.onQuickCraft(itemstack1, itemstack); // Paper - moved to after the non-check moveItemStackTo call
+ // this.playTradeSound();
} else if (index != 0 && index != 1) {
if (index >= 3 && index < 30) {
if (!this.moveItemStackTo(itemstack1, 30, 39, false)) {
@@ -152,6 +152,7 @@ public class MerchantMenu extends AbstractContainerMenu {
return ItemStack.EMPTY;
}
+ if (index != 2) { // Paper - moved down for slot 2
if (itemstack1.isEmpty()) {
slot.set(ItemStack.EMPTY);
} else {
@@ -163,6 +164,21 @@ public class MerchantMenu extends AbstractContainerMenu {
}
slot.onTake(player, itemstack1);
+ } // Paper start - handle slot 2
+ if (index == 2) { // is merchant result slot
+ slot.onTake(player, itemstack1);
+ if (itemstack1.isEmpty()) {
+ slot.set(ItemStack.EMPTY);
+ return ItemStack.EMPTY;
+ }
+
+ this.moveItemStackTo(itemstack1, 3, 39, true, false); // This should always succeed because it's checked above
+
+ slot.onQuickCraft(itemstack1, itemstack);
+ this.playTradeSound();
+ slot.set(ItemStack.EMPTY); // itemstack1 should ALWAYS be empty
+ }
+ // Paper end
}
return itemstack;
diff --git a/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java b/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
index 74b28315197b81f80334ae6023113904e4fac4c3..9e65c9535e01b3c858050a7881aff3f99edbeaac 100644
--- a/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
+++ b/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
@@ -47,13 +47,30 @@ public class MerchantResultSlot extends Slot {
@Override
public void onTake(Player player, ItemStack stack) {
- this.checkTakeAchievements(stack);
+ // this.checkTakeAchievements(stack); // Paper - move to after event is called and not cancelled
MerchantOffer merchantOffer = this.slots.getActiveOffer();
+ // Paper start
+ io.papermc.paper.event.player.PlayerPurchaseEvent event = null;
+ if (this.merchant instanceof net.minecraft.world.entity.npc.AbstractVillager && this.merchant.getTradingPlayer().getBukkitEntity() instanceof org.bukkit.entity.Player) {
+ event = new io.papermc.paper.event.player.PlayerTradeEvent((org.bukkit.entity.Player) this.merchant.getTradingPlayer().getBukkitEntity(), (org.bukkit.entity.AbstractVillager) ((net.minecraft.world.entity.npc.AbstractVillager) this.merchant).getBukkitEntity(), merchantOffer.asBukkit(), true, true);
+ } else if (this.merchant instanceof org.bukkit.craftbukkit.inventory.CraftMerchantCustom.MinecraftMerchant && this.merchant.getTradingPlayer().getBukkitEntity() instanceof org.bukkit.entity.Player) {
+ event = new io.papermc.paper.event.player.PlayerPurchaseEvent((org.bukkit.entity.Player) this.merchant.getTradingPlayer().getBukkitEntity(), merchantOffer.asBukkit(), false, true);
+ }
+ if (event != null) {
+ if (!event.callEvent()) {
+ stack.setCount(0);
+ event.getPlayer().updateInventory();
+ return;
+ }
+ merchantOffer = org.bukkit.craftbukkit.inventory.CraftMerchantRecipe.fromBukkit(event.getTrade()).toMinecraft();
+ }
+ this.checkTakeAchievements(stack);
+ // Paper end
if (merchantOffer != null) {
ItemStack itemStack = this.slots.getItem(0);
ItemStack itemStack2 = this.slots.getItem(1);
if (merchantOffer.take(itemStack, itemStack2) || merchantOffer.take(itemStack2, itemStack)) {
- this.merchant.notifyTrade(merchantOffer);
+ this.merchant.processTrade(merchantOffer, event); // Paper
player.awardStat(Stats.TRADED_WITH_VILLAGER);
this.slots.setItem(0, itemStack);
this.slots.setItem(1, itemStack2);
diff --git a/src/main/java/net/minecraft/world/item/trading/Merchant.java b/src/main/java/net/minecraft/world/item/trading/Merchant.java
index 50dca0d86dbc47f66ba2d2f262e8587853cc6f9e..f11eff88ba4b9a4f8601d70c07907cc12611a1d0 100644
--- a/src/main/java/net/minecraft/world/item/trading/Merchant.java
+++ b/src/main/java/net/minecraft/world/item/trading/Merchant.java
@@ -21,6 +21,7 @@ public interface Merchant {
void overrideOffers(MerchantOffers offers);
+ default void processTrade(MerchantOffer merchantRecipe, io.papermc.paper.event.player.PlayerPurchaseEvent event) { this.notifyTrade(merchantRecipe); } // Paper
void notifyTrade(MerchantOffer offer);
void notifyTradeUpdated(ItemStack stack);
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
index f40d6a0048ad5b3f6e31d83894ee89f5ca64fb3a..22a64092e3b925e852b304376fe0a7c19acf35d0 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
@@ -79,10 +79,25 @@ public class CraftMerchantCustom extends CraftMerchant {
return this.trades;
}
+ // Paper start
+ @Override
+ public void processTrade(MerchantOffer merchantRecipe, io.papermc.paper.event.player.PlayerPurchaseEvent event) { // The MerchantRecipe passed in here is the one set by the PlayerPurchaseEvent
+ /** Based on {@link net.minecraft.world.entity.npc.AbstractVillager#processTrade(MerchantOffer, io.papermc.paper.event.player.PlayerPurchaseEvent)} */
+ if (getTradingPlayer() instanceof net.minecraft.server.level.ServerPlayer) {
+ if (event.willIncreaseTradeUses()) {
+ merchantRecipe.increaseUses();
+ }
+ if (event.isRewardingExp()) {
+ this.tradingWorld.addFreshEntity(new net.minecraft.world.entity.ExperienceOrb(tradingWorld, tradingPlayer.getX(), tradingPlayer.getY(), tradingPlayer.getZ(), merchantRecipe.getXp(), org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.tradingPlayer, null));
+ }
+ }
+ this.notifyTrade(merchantRecipe);
+ }
+ // Paper end
@Override
public void notifyTrade(MerchantOffer offer) {
// increase recipe's uses
- offer.increaseUses();
+ // offer.increaseUses(); // Paper - handled above in processTrade
}
@Override
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