From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jedediah Smith <jedediah@silencegreys.com>
Date: Sat, 2 Apr 2016 05:09:16 -0400
Subject: [PATCH] Add PlayerUseUnknownEntityEvent

Adds the PlayerUseUnknownEntityEvent to be used by plugins dealing with
virtual entities/entities that are not actually known to the server.

Co-authored-by: Nassim Jahnke <nassim@njahnke.dev>

diff --git a/src/main/java/net/minecraft/network/protocol/game/ServerboundInteractPacket.java b/src/main/java/net/minecraft/network/protocol/game/ServerboundInteractPacket.java
index 47130f72d8ad96565ba2357dd6cd6c32779e14c3..7b830d1fcb83cbf24e7a12e9bc5aff0d1c9d1a44 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ServerboundInteractPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ServerboundInteractPacket.java
@@ -169,4 +169,14 @@ public class ServerboundInteractPacket implements Packet<ServerGamePacketListene
             buf.writeEnum(this.hand);
         }
     }
+
+    // Paper start - PlayerUseUnknownEntityEvent
+    public int getEntityId() {
+        return this.entityId;
+    }
+
+    public boolean isAttack() {
+        return this.action.getType() == ActionType.ATTACK;
+    }
+    // Paper end - PlayerUseUnknownEntityEvent
 }
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 98266c0349d21fc1ebf0d34a3d898825d477d6e5..a4e010b9195d0afeb4724dc64c85964a843eb59a 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2385,8 +2385,38 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                 });
             }
         }
+        // Paper start - PlayerUseUnknownEntityEvent
+        else {
+            packet.dispatch(new net.minecraft.network.protocol.game.ServerboundInteractPacket.Handler() {
+                @Override
+                public void onInteraction(net.minecraft.world.InteractionHand hand) {
+                    ServerGamePacketListenerImpl.this.callPlayerUseUnknownEntityEvent(packet, hand, null);
+                }
+
+                @Override
+                public void onInteraction(net.minecraft.world.InteractionHand hand, net.minecraft.world.phys.Vec3 pos) {
+                    ServerGamePacketListenerImpl.this.callPlayerUseUnknownEntityEvent(packet, hand, pos);
+                }
+
+                @Override
+                public void onAttack() {
+                    ServerGamePacketListenerImpl.this.callPlayerUseUnknownEntityEvent(packet, net.minecraft.world.InteractionHand.MAIN_HAND, null);
+                }
+            });
+        }
+
+    }
 
+    private void callPlayerUseUnknownEntityEvent(ServerboundInteractPacket packet, InteractionHand hand, @Nullable net.minecraft.world.phys.Vec3 vector) {
+        this.cserver.getPluginManager().callEvent(new com.destroystokyo.paper.event.player.PlayerUseUnknownEntityEvent(
+            this.getCraftPlayer(),
+            packet.getEntityId(),
+            packet.isAttack(),
+            hand == InteractionHand.MAIN_HAND ? EquipmentSlot.HAND : EquipmentSlot.OFF_HAND,
+            vector != null ? new org.bukkit.util.Vector(vector.x, vector.y, vector.z) : null)
+        );
     }
+    // Paper end - PlayerUseUnknownEntityEvent
 
     @Override
     public void handleClientCommand(ServerboundClientCommandPacket packet) {