Paper/patches/server/0564-Fix-curing-zombie-villager-discount-exploit.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <blake.galbreath@gmail.com>
Date: Tue, 8 Dec 2020 20:14:20 -0600
Subject: [PATCH] Fix curing zombie villager discount exploit
This fixes the exploit used to gain absurd trading discounts with infecting
and curing a villager on repeat by simply resetting the relevant part of
the reputation when it is cured.
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 5267c958ce8e70dcdbf30c7db42e9af7c4a89e0f..d1cd007032abf3073ea4ee0e61ce0995addf40dd 100644
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--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
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@@ -79,6 +79,11 @@ public class PaperWorldConfig {
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fixClimbingBypassingCrammingRule = getBoolean("fix-climbing-bypassing-cramming-rule", fixClimbingBypassingCrammingRule);
}
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+ public boolean fixCuringZombieVillagerDiscountExploit = true;
+ private void fixCuringExploit() {
+ fixCuringZombieVillagerDiscountExploit = getBoolean("game-mechanics.fix-curing-zombie-villager-discount-exploit", fixCuringZombieVillagerDiscountExploit);
+ }
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+
public short keepLoadedRange;
private void keepLoadedRange() {
keepLoadedRange = (short) (getInt("keep-spawn-loaded-range", Math.min(spigotConfig.viewDistance, 10)) * 16);
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diff --git a/src/main/java/net/minecraft/world/entity/npc/Villager.java b/src/main/java/net/minecraft/world/entity/npc/Villager.java
index 25bc1f56e884e8fd9fc900d05dc82712e2f6e9d4..eaefa4f5f86f1c836aa29dd64ea786baced4b34d 100644
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--- a/src/main/java/net/minecraft/world/entity/npc/Villager.java
+++ b/src/main/java/net/minecraft/world/entity/npc/Villager.java
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@@ -1056,6 +1056,15 @@ public class Villager extends AbstractVillager implements ReputationEventHandler
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@Override
public void onReputationEventFrom(ReputationEventType interaction, Entity entity) {
if (interaction == ReputationEventType.ZOMBIE_VILLAGER_CURED) {
+ // Paper start - fix MC-181190
+ if (level.paperConfig.fixCuringZombieVillagerDiscountExploit) {
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+ final GossipContainer.EntityGossips playerReputation = this.getGossips().getReputations().get(entity.getUUID());
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+ if (playerReputation != null) {
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+ playerReputation.remove(GossipType.MAJOR_POSITIVE);
+ playerReputation.remove(GossipType.MINOR_POSITIVE);
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+ }
+ }
+ // Paper end
this.gossips.add(entity.getUUID(), GossipType.MAJOR_POSITIVE, 20);
this.gossips.add(entity.getUUID(), GossipType.MINOR_POSITIVE, 25);
} else if (interaction == ReputationEventType.TRADE) {