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 644a0fdea6576647539b96528717dbaeab498d93..221e64a66ff12a8de5c75992fc26a54a03b317e7 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 8c8c3085711989c90ea9ae51b3d95abee284a71e..3c04fa0a96eb4f3ceb50d69f57df339f6eea3ca3 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2407,8 +2407,38 @@ 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) {