From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 12 May 2021 04:30:42 -0700
Subject: [PATCH] Add EntityPortalReadyEvent


diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index d328393e62e4e49ddd56c10a9f4f5fcf0b218ddf..6be5d68567ba7b598644a3feeaa34ae5171c3b97 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -2943,6 +2943,17 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
             if (this.portalProcess != null) {
                 if (this.portalProcess.processPortalTeleportation(worldserver, this, this.canUsePortal(false))) {
                     worldserver.getProfiler().push("portal");
+                    // Paper start - Add EntityPortalReadyEvent
+                    ServerLevel changedTarget = worldserver.getServer().getLevel(worldserver.getTypeKey() == net.minecraft.world.level.dimension.LevelStem.NETHER ? Level.OVERWORLD : Level.NETHER);
+                    if (this.portalProcess.isSamePortal(((net.minecraft.world.level.block.NetherPortalBlock) net.minecraft.world.level.block.Blocks.NETHER_PORTAL))) {
+                        io.papermc.paper.event.entity.EntityPortalReadyEvent event = new io.papermc.paper.event.entity.EntityPortalReadyEvent(this.getBukkitEntity(), changedTarget == null ? null : changedTarget.getWorld(), org.bukkit.PortalType.NETHER);
+                        if (!event.callEvent()) {
+                            this.portalProcess = null;
+                            worldserver.getProfiler().pop();
+                            return;
+                        }
+                    }
+                    // Paper end - Add EntityPortalReadyEvent
                     this.setPortalCooldown();
                     DimensionTransition dimensiontransition = this.portalProcess.getPortalDestination(worldserver, this);