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/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
index d330b6d291cd2967358e892ccbc480bb3bd8022d..16d84042e2575418880897c728a99d1b8bbcdd15 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -1305,12 +1305,15 @@ public abstract class Mob extends LivingEntity implements Targeting {
             return InteractionResult.PASS;
         } else if (this.getLeashHolder() == player) {
             // CraftBukkit start - fire PlayerUnleashEntityEvent
-            if (CraftEventFactory.callPlayerUnleashEntityEvent(this, player, hand).isCancelled()) {
+            // Paper start - drop leash variable
+            org.bukkit.event.player.PlayerUnleashEntityEvent event = CraftEventFactory.callPlayerUnleashEntityEvent(this, player, hand, !player.getAbilities().instabuild);
+            if (event.isCancelled()) {
+                // Paper end
                 ((ServerPlayer) player).connection.send(new ClientboundSetEntityLinkPacket(this, this.getLeashHolder()));
                 return InteractionResult.PASS;
             }
             // CraftBukkit end
-            this.dropLeash(true, !player.getAbilities().instabuild);
+            this.dropLeash(true, event.isDropLeash()); // Paper - drop leash variable
             this.gameEvent(GameEvent.ENTITY_INTERACT, player);
             return InteractionResult.sidedSuccess(this.level().isClientSide);
         } else {
@@ -1478,8 +1481,11 @@ public abstract class Mob extends LivingEntity implements Targeting {
 
         if (this.leashHolder != null) {
             if (!this.isAlive() || !this.leashHolder.isAlive()) {
-                this.level().getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), (!this.isAlive()) ? UnleashReason.PLAYER_UNLEASH : UnleashReason.HOLDER_GONE)); // CraftBukkit
-                this.dropLeash(true, !this.leashHolder.pluginRemoved);// CraftBukkit - SPIGOT-7487: Don't drop leash, when the holder was removed by a plugin
+                // Paper start - drop leash variable
+                EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), (!this.isAlive()) ? EntityUnleashEvent.UnleashReason.PLAYER_UNLEASH : EntityUnleashEvent.UnleashReason.HOLDER_GONE, !this.leashHolder.pluginRemoved);
+                this.level().getCraftServer().getPluginManager().callEvent(event); // CraftBukkit
+                this.dropLeash(true, event.isDropLeash());
+                // Paper end
             }
 
         }
@@ -1542,8 +1548,11 @@ public abstract class Mob extends LivingEntity implements Targeting {
         boolean flag1 = super.startRiding(entity, force);
 
         if (flag1 && this.isLeashed()) {
-            this.level().getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN)); // CraftBukkit
-            this.dropLeash(true, true);
+            // Paper start - drop leash variable
+            EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.UNKNOWN, true);
+            if (!event.callEvent()) { return flag1; }
+            this.dropLeash(true, event.isDropLeash());
+            // Paper end
         }
 
         return flag1;
@@ -1733,8 +1742,11 @@ public abstract class Mob extends LivingEntity implements Targeting {
     @Override
     protected void removeAfterChangingDimensions() {
         super.removeAfterChangingDimensions();
-        this.level().getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), UnleashReason.UNKNOWN)); // CraftBukkit
-        this.dropLeash(true, false);
+        // Paper start - drop leash variable
+        EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.UNKNOWN, false);
+        this.level().getCraftServer().getPluginManager().callEvent(event); // CraftBukkit
+        this.dropLeash(true, event.isDropLeash());
+        // Paper end
         this.getAllSlots().forEach((itemstack) -> {
             if (!itemstack.isEmpty()) {
                 itemstack.setCount(0);
diff --git a/src/main/java/net/minecraft/world/entity/PathfinderMob.java b/src/main/java/net/minecraft/world/entity/PathfinderMob.java
index 452f219fde958fb4dc775cd2c56c0576c45a8045..7ed610c67fcfa200c30e13a49146907f765bc5ed 100644
--- a/src/main/java/net/minecraft/world/entity/PathfinderMob.java
+++ b/src/main/java/net/minecraft/world/entity/PathfinderMob.java
@@ -57,8 +57,11 @@ public abstract class PathfinderMob extends Mob {
 
             if (this instanceof TamableAnimal && ((TamableAnimal) this).isInSittingPose()) {
                 if (f > entity.level().paperConfig().misc.maxLeashDistance) { // Paper
-                    this.level().getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE)); // CraftBukkit
-                    this.dropLeash(true, true);
+                    // Paper start - drop leash variable
+                    EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE, true);
+                    if (!event.callEvent()) return;
+                    this.dropLeash(true, event.isDropLeash());
+                    // Paper end
                 }
 
                 return;
@@ -66,8 +69,11 @@ public abstract class PathfinderMob extends Mob {
 
             this.onLeashDistance(f);
             if (f > entity.level().paperConfig().misc.maxLeashDistance) { // Paper
-                this.level().getCraftServer().getPluginManager().callEvent(new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE)); // CraftBukkit
-                this.dropLeash(true, true);
+                // Paper start - drop leash variable
+                EntityUnleashEvent event = new EntityUnleashEvent(this.getBukkitEntity(), EntityUnleashEvent.UnleashReason.DISTANCE, true);
+                if (!event.callEvent()) return;
+                this.dropLeash(true, event.isDropLeash());
+                // Paper end
                 this.goalSelector.disableControlFlag(Goal.Flag.MOVE);
             } else if (f > 6.0F) {
                 double d0 = (entity.getX() - this.getX()) / (double) f;
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 16784fcc853e23689a854e7dc6c03ed8182a164e..4eb97572a97a8d98af37c4223f42fc63659bc0ca 100644
--- a/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java
+++ b/src/main/java/net/minecraft/world/entity/decoration/LeashFenceKnotEntity.java
@@ -126,11 +126,14 @@ public class LeashFenceKnotEntity extends HangingEntity {
 
                         if (entityinsentient1.isLeashed() && entityinsentient1.getLeashHolder() == this) {
                             // CraftBukkit start
-                            if (CraftEventFactory.callPlayerUnleashEntityEvent(entityinsentient1, player, hand).isCancelled()) {
+                            // Paper start - drop leash variable
+                            org.bukkit.event.player.PlayerUnleashEntityEvent event = CraftEventFactory.callPlayerUnleashEntityEvent(entityinsentient1, player, hand, !player.getAbilities().instabuild);
+                            if (event.isCancelled()) {
+                                // Paper end
                                 die = false;
                                 continue;
                             }
-                            entityinsentient1.dropLeash(true, !player.getAbilities().instabuild); // false -> survival mode boolean
+                            entityinsentient1.dropLeash(true, event.isDropLeash()); // false -> survival mode boolean // Paper - drop leash variable
                             // CraftBukkit end
                             flag1 = true;
                         }
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 3fef79f0e3b8a05b11b77802b80acc8e5c584653..2d9d6d735a13e0e0fc1f277f48c7bdb05aa3352a 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1637,8 +1637,10 @@ public class CraftEventFactory {
         Bukkit.getPluginManager().callEvent(new PlayerRecipeBookSettingsChangeEvent(player.getBukkitEntity(), bukkitType, open, filter));
     }
 
-    public static PlayerUnleashEntityEvent callPlayerUnleashEntityEvent(Mob entity, net.minecraft.world.entity.player.Player player, InteractionHand enumhand) {
-        PlayerUnleashEntityEvent event = new PlayerUnleashEntityEvent(entity.getBukkitEntity(), (Player) player.getBukkitEntity(), CraftEquipmentSlot.getHand(enumhand));
+    // Paper start - drop leash variable
+    public static PlayerUnleashEntityEvent callPlayerUnleashEntityEvent(Mob 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
         entity.level().getCraftServer().getPluginManager().callEvent(event);
         return event;
     }