PaperMC/nms-patches/TileEntityEndGateway.patch

--- a/net/minecraft/server/TileEntityEndGateway.java
+++ b/net/minecraft/server/TileEntityEndGateway.java
@@ -5,6 +5,10 @@
 import java.util.Random;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.event.player.PlayerTeleportEvent;
 
 public class TileEntityEndGateway extends TileEntity implements ITickable {
 
@@ -103,6 +107,26 @@
             if (this.h != null) {
                 BlockPosition blockposition = this.i ? this.h : this.j();
 
+                // CraftBukkit start - Fire PlayerTeleportEvent
+                if (entity instanceof EntityPlayer) {
+                    org.bukkit.craftbukkit.entity.CraftPlayer player = (CraftPlayer) entity.getBukkitEntity();
+                    org.bukkit.Location location = new Location(world.getWorld(), (double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D);
+                    location.setPitch(player.getLocation().getPitch());
+                    location.setYaw(player.getLocation().getYaw());
+
+                    PlayerTeleportEvent teleEvent = new PlayerTeleportEvent(player, player.getLocation(), location, PlayerTeleportEvent.TeleportCause.END_GATEWAY);
+                    Bukkit.getPluginManager().callEvent(teleEvent);
+                    if (teleEvent.isCancelled()) {
+                        return;
+                    }
+
+                    ((EntityPlayer) entity).playerConnection.teleport(teleEvent.getTo());
+                    this.h();
+                    return;
+
+                }
+                // CraftBukkit end
+
                 entity.enderTeleportTo((double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D);
             }