From f6a5881c8abe81101299f583c2b21405df79d57a Mon Sep 17 00:00:00 2001
From: Caleb Bassham <caleb.bassham@gmail.com>
Date: Fri, 28 Sep 2018 02:32:19 -0500
Subject: [PATCH] Call player spectator target events


diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
index f43584f0e3..bc62a9f08e 100644
--- a/src/main/java/net/minecraft/server/EntityPlayer.java
+++ b/src/main/java/net/minecraft/server/EntityPlayer.java
@@ -61,7 +61,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     private EnumChatVisibility ch;
     private boolean ci = true;
     private long cj = SystemUtils.getMonotonicMillis();
-    private Entity spectatedEntity;
+    private Entity spectatedEntity; private void setSpectatorTargetField(Entity e) { this.spectatedEntity = e; } // Paper - OBFHELPER
     public boolean worldChangeInvuln;
     private boolean cm; private void setHasSeenCredits(boolean has) { this.cm = has; } // Paper - OBFHELPER
     private final RecipeBookServer recipeBook;
@@ -1586,15 +1586,35 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         return (Entity) (this.spectatedEntity == null ? this : this.spectatedEntity);
     }
 
-    public void setSpectatorTarget(Entity entity) {
+    public void setSpectatorTarget(Entity newSpectatorTarget) {
+        // Paper start - Add PlayerStartSpectatingEntityEvent and PlayerStopSpectatingEntity Event
         Entity entity1 = this.getSpecatorTarget();
 
-        this.spectatedEntity = (Entity) (entity == null ? this : entity);
-        if (entity1 != this.spectatedEntity) {
-            this.playerConnection.sendPacket(new PacketPlayOutCamera(this.spectatedEntity));
-            this.playerConnection.a(this.spectatedEntity.locX(), this.spectatedEntity.locY(), this.spectatedEntity.locZ(), this.yaw, this.pitch, TeleportCause.SPECTATE); // CraftBukkit
+        if (newSpectatorTarget == null) {
+            newSpectatorTarget = this;
         }
 
+        if (entity1 == newSpectatorTarget) return; // new spec target is the current spec target
+
+        if (newSpectatorTarget == this) {
+            com.destroystokyo.paper.event.player.PlayerStopSpectatingEntityEvent playerStopSpectatingEntityEvent = new com.destroystokyo.paper.event.player.PlayerStopSpectatingEntityEvent(this.getBukkitEntity(), entity1.getBukkitEntity());
+
+            if (!playerStopSpectatingEntityEvent.callEvent()) {
+                return;
+            }
+        } else {
+            com.destroystokyo.paper.event.player.PlayerStartSpectatingEntityEvent playerStartSpectatingEntityEvent = new com.destroystokyo.paper.event.player.PlayerStartSpectatingEntityEvent(this.getBukkitEntity(), entity1.getBukkitEntity(), newSpectatorTarget.getBukkitEntity());
+
+            if (!playerStartSpectatingEntityEvent.callEvent()) {
+                return;
+            }
+        }
+
+        setSpectatorTargetField(newSpectatorTarget);
+
+        this.playerConnection.sendPacket(new PacketPlayOutCamera(newSpectatorTarget));
+        this.playerConnection.a(this.spectatedEntity.locX(), this.spectatedEntity.locY(), this.spectatedEntity.locZ(), this.yaw, this.pitch, TeleportCause.SPECTATE); // CraftBukkit
+        // Paper end
     }
 
     @Override
@@ -1602,7 +1622,6 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         if (this.portalCooldown > 0 && !this.worldChangeInvuln) {
             --this.portalCooldown;
         }
-
     }
 
     @Override
-- 
2.26.2