From 1b889688a5861b7770970b75c6b7183ba7f22164 Mon Sep 17 00:00:00 2001
From: TonytheMacaroni <tonythemacaroni123@gmail.com>
Date: Mon, 14 Apr 2025 04:12:48 -0400
Subject: [PATCH] Add Entity#isTrackedBy (#12332)

---
 .../src/main/java/org/bukkit/entity/Entity.java      |  9 +++++++++
 .../org/bukkit/craftbukkit/entity/CraftEntity.java   | 12 ++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/paper-api/src/main/java/org/bukkit/entity/Entity.java b/paper-api/src/main/java/org/bukkit/entity/Entity.java
index 5a3a538c56..bb6c6b3477 100644
--- a/paper-api/src/main/java/org/bukkit/entity/Entity.java
+++ b/paper-api/src/main/java/org/bukkit/entity/Entity.java
@@ -698,6 +698,15 @@ public interface Entity extends Metadatable, CommandSender, Nameable, Persistent
     @NotNull
     Set<Player> getTrackedBy();
 
+    /**
+     * Checks to see if a player is currently tracking this entity.
+     *
+     * @param player the player to check
+     * @return if the player is currently tracking this entity
+     * @see #getTrackedBy()
+     */
+    boolean isTrackedBy(@NotNull Player player);
+
     /**
      * Sets whether the entity has a team colored (default: white) glow.
      *
diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
index 9c249638eb..c8caeba773 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -725,6 +725,18 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         return players.build();
     }
 
+    @Override
+    public boolean isTrackedBy(final Player player) {
+        Preconditions.checkState(!this.entity.generation, "Cannot check tracking players during world generation");
+        Preconditions.checkArgument(player != null, "Player cannot be null");
+
+        ServerLevel world = ((CraftWorld) this.getWorld()).getHandle();
+        ChunkMap.TrackedEntity entityTracker = world.getChunkSource().chunkMap.entityMap.get(this.getEntityId());
+        if (entityTracker == null) return false;
+
+        return entityTracker.seenBy.contains(((CraftPlayer) player).getHandle().connection);
+    }
+
     @Override
     public void sendMessage(String message) {