PaperMC/patches/server/0474-Expand-EntityUnleashEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <nassim@njahnke.dev>
Date: Fri, 29 Jan 2021 15:13:11 +0100
Subject: [PATCH] Expand EntityUnleashEvent


diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index e556788a7c5e38c6ed293d566f75ef6501b7464c..a18e716a8c1c6f1fe23dcd3f4da033da95417e22 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -2715,12 +2715,15 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
             if (leashable.getLeashHolder() == player) {
                 if (!this.level().isClientSide()) {
                     // CraftBukkit start - fire PlayerUnleashEntityEvent
-                    if (CraftEventFactory.callPlayerUnleashEntityEvent(this, player, hand).isCancelled()) {
+                    // Paper start - Expand EntityUnleashEvent
+                    org.bukkit.event.player.PlayerUnleashEntityEvent event = CraftEventFactory.callPlayerUnleashEntityEvent(this, player, hand, !player.hasInfiniteMaterials());
+                    if (event.isCancelled()) {
+                        // Paper end - Expand EntityUnleashEvent
                         ((ServerPlayer) player).connection.send(new ClientboundSetEntityLinkPacket(this, leashable.getLeashHolder()));
                         return InteractionResult.PASS;
                     }
                     // CraftBukkit end
-                    if (player.hasInfiniteMaterials()) {
+                    if (!event.isDropLeash()) { // Paper - Expand EntityUnleashEvent
                         leashable.removeLeash();
                     } else {
                         leashable.dropLeash();
@@ -3690,9 +3693,16 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
 
     protected void removeAfterChangingDimensions() {
         this.setRemoved(Entity.RemovalReason.CHANGED_DIMENSION, null); // CraftBukkit - add Bukkit remove cause
-        if (this instanceof Leashable leashable) {
-            this.level().getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN)); // CraftBukkit
-            leashable.removeLeash();
+        if (this instanceof Leashable leashable && leashable.isLeashed()) { // Paper - only call if it is leashed
+            // Paper start - Expand EntityUnleashEvent
+            final EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN, false); // CraftBukkit
+            event.callEvent();
+            if (!event.isDropLeash()) {
+                leashable.removeLeash();
+            } else {
+                leashable.dropLeash();
+            }
+            // Paper end - Expand EntityUnleashEvent
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/entity/Leashable.java b/src/main/java/net/minecraft/world/entity/Leashable.java
index 5e67402340a81a965b0b3af88307d36500c2dc6b..68b869c5d76aeb390a05b053eef70486bd4126fd 100644
--- a/src/main/java/net/minecraft/world/entity/Leashable.java
+++ b/src/main/java/net/minecraft/world/entity/Leashable.java
@@ -184,8 +184,11 @@ public interface Leashable {
 
         if (leashable_a != null && leashable_a.leashHolder != null) {
             if (!entity.isAlive() || !leashable_a.leashHolder.isAlive()) {
-                world.getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(entity.getBukkitEntity(), (!entity.isAlive()) ? UnleashReason.PLAYER_UNLEASH : UnleashReason.HOLDER_GONE)); // CraftBukkit
-                if (world.getGameRules().getBoolean(GameRules.RULE_DOENTITYDROPS) && !entity.pluginRemoved) { // CraftBukkit - SPIGOT-7487: Don't drop leash, when the holder was removed by a plugin
+                // Paper start - Expand EntityUnleashEvent
+                final EntityUnleashEvent event = new EntityUnleashEvent(entity.getBukkitEntity(), (!entity.isAlive()) ? UnleashReason.PLAYER_UNLEASH : UnleashReason.HOLDER_GONE, world.getGameRules().getBoolean(GameRules.RULE_DOENTITYDROPS) && !entity.pluginRemoved);
+                event.callEvent();
+                if (event.isDropLeash()) { // CraftBukkit - SPIGOT-7487: Don't drop leash, when the holder was removed by a plugin
+                    // Paper end - Expand EntityUnleashEvent
                     ((Leashable) entity).dropLeash();
                 } else {
                     ((Leashable) entity).removeLeash();
@@ -220,11 +223,20 @@ public interface Leashable {
 
     default void leashTooFarBehaviour() {
         // CraftBukkit start
+        boolean dropLeash = true; // Paper
         if (this instanceof Entity entity) {
-            entity.level().getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(entity.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE));
+            // Paper start - Expand EntityUnleashEvent
+            final EntityUnleashEvent event = new EntityUnleashEvent(entity.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE, true);
+            if (!event.callEvent()) return;
+            dropLeash = event.isDropLeash();
         }
         // CraftBukkit end
-        this.dropLeash();
+        if (dropLeash) {
+            this.dropLeash();
+        } else {
+            this.removeLeash();
+        }
+        // Paper end - Expand EntityUnleashEvent
     }
 
     default void closeRangeLeashBehaviour(Entity entity) {}
diff --git a/src/main/java/net/minecraft/world/entity/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
index b3c27cdf7d336404403fe09553080835f2d3de49..7d3e165bae2c00737019689b7bf1e74ad2517270 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -1612,8 +1612,15 @@ public abstract class Mob extends LivingEntity implements EquipmentUser, Leashab
         boolean flag1 = super.startRiding(entity, force);
 
         if (flag1 && this.isLeashed()) {
-            this.level().getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN)); // CraftBukkit
-            this.dropLeash();
+            // Paper start - Expand EntityUnleashEvent
+            EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.UNKNOWN, true);
+            if (!event.callEvent()) { return flag1; }
+            if (event.isDropLeash()) {
+                this.dropLeash();
+            } else {
+                this.removeLeash();
+            }
+            // Paper end - Expand EntityUnleashEvent
         }
 
         return flag1;
diff --git a/src/main/java/net/minecraft/world/entity/TamableAnimal.java b/src/main/java/net/minecraft/world/entity/TamableAnimal.java
index 9c6e2124da7c2358d2d524c52d3e77422f15f6e5..45a340fddcec48dfb796f4515a500452adb30c59 100644
--- a/src/main/java/net/minecraft/world/entity/TamableAnimal.java
+++ b/src/main/java/net/minecraft/world/entity/TamableAnimal.java
@@ -102,7 +102,15 @@ public abstract class TamableAnimal extends Animal implements OwnableEntity {
     public boolean handleLeashAtDistance(Entity leashHolder, float distance) {
         if (this.isInSittingPose()) {
             if (distance > (float) this.level().paperConfig().misc.maxLeashDistance.or(Leashable.LEASH_TOO_FAR_DIST)) { // Paper - Configurable max leash distance
-                this.dropLeash();
+                // Paper start - Expand EntityUnleashEvent
+                org.bukkit.event.entity.EntityUnleashEvent event = new org.bukkit.event.entity.EntityUnleashEvent(this.getBukkitEntity(), org.bukkit.event.entity.EntityUnleashEvent.UnleashReason.DISTANCE, true);
+                if (!event.callEvent()) return false;
+                if (event.isDropLeash()) {
+                    this.dropLeash();
+                } else {
+                    this.removeLeash();
+                }
+                // Paper end - Expand EntityUnleashEvent
             }
 
             return false;
diff --git a/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java b/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java
index d4955d4174e5c2920d5cccaa4494db2c27284660..d06ec03ad16630f2dfd81cf9f32542bd1c2592de 100644
--- a/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java
+++ b/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java
@@ -119,13 +119,18 @@ public class LeashFenceKnotEntity extends BlockAttachedEntity {
 
                         if (leashable1.isLeashed() && leashable1.getLeashHolder() == this) {
                             // CraftBukkit start
+                            boolean dropLeash = !player.hasInfiniteMaterials();
                             if (leashable1 instanceof Entity leashed) {
-                                if (CraftEventFactory.callPlayerUnleashEntityEvent(leashed, player, hand).isCancelled()) {
+                                // Paper start - Expand EntityUnleashEvent
+                                org.bukkit.event.player.PlayerUnleashEntityEvent event = CraftEventFactory.callPlayerUnleashEntityEvent(leashed, player, hand, dropLeash);
+                                dropLeash = event.isDropLeash();
+                                if (event.isCancelled()) {
+                                    // Paper end - Expand EntityUnleashEvent
                                     die = false;
                                     continue;
                                 }
                             }
-                            if (player.getAbilities().instabuild){
+                            if (!dropLeash) { // Paper - Expand EntityUnleashEvent
                                 leashable1.removeLeash();
                             } else {
                                 leashable1.dropLeash();
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 6d1d3451054af05e2381d70d71b99869f37c0901..697c69b60aa45b6a229f3bec77dc728e50a895ce 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1596,8 +1596,10 @@ public class CraftEventFactory {
         Bukkit.getPluginManager().callEvent(new PlayerRecipeBookSettingsChangeEvent(player.getBukkitEntity(), bukkitType, open, filter));
     }
 
-    public static PlayerUnleashEntityEvent callPlayerUnleashEntityEvent(Entity entity, net.minecraft.world.entity.player.Player player, InteractionHand enumhand) {
-        PlayerUnleashEntityEvent event = new PlayerUnleashEntityEvent(entity.getBukkitEntity(), (Player) player.getBukkitEntity(), CraftEquipmentSlot.getHand(enumhand));
+    // Paper start - Expand EntityUnleashEvent
+    public static PlayerUnleashEntityEvent callPlayerUnleashEntityEvent(Entity entity, net.minecraft.world.entity.player.Player player, InteractionHand enumhand, boolean dropLeash) {
+        PlayerUnleashEntityEvent event = new PlayerUnleashEntityEvent(entity.getBukkitEntity(), (Player) player.getBukkitEntity(), CraftEquipmentSlot.getHand(enumhand), dropLeash);
+        // Paper end - Expand EntityUnleashEvent
         entity.level().getCraftServer().getPluginManager().callEvent(event);
         return event;
     }