PaperMC/nms-patches/BlockPortal.patch

--- a/net/minecraft/server/BlockPortal.java
+++ b/net/minecraft/server/BlockPortal.java
@@ -4,6 +4,12 @@
 import java.util.Random;
 import javax.annotation.Nullable;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.event.entity.EntityPortalEnterEvent;
+import org.bukkit.event.world.PortalCreateEvent;
+// CraftBukkit end
+
 public class BlockPortal extends Block {
 
     public static final BlockStateEnum<EnumDirection.EnumAxis> AXIS = BlockProperties.D;
@@ -34,7 +40,8 @@
             }
 
             if (world.getType(blockposition).a((IBlockAccess) world, blockposition, EntityTypes.ZOMBIE_PIGMAN)) {
-                Entity entity = EntityTypes.ZOMBIE_PIGMAN.spawnCreature(world, (NBTTagCompound) null, (IChatBaseComponent) null, (EntityHuman) null, blockposition.up(), EnumMobSpawn.STRUCTURE, false, false);
+                // CraftBukkit - set spawn reason to NETHER_PORTAL
+                Entity entity = EntityTypes.ZOMBIE_PIGMAN.spawnCreature(world, (NBTTagCompound) null, (IChatBaseComponent) null, (EntityHuman) null, blockposition.up(), EnumMobSpawn.STRUCTURE, false, false, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.NETHER_PORTAL);
 
                 if (entity != null) {
                     entity.portalCooldown = entity.aW();
@@ -48,8 +55,10 @@
         BlockPortal.Shape blockportal_shape = this.b(generatoraccess, blockposition);
 
         if (blockportal_shape != null) {
-            blockportal_shape.createPortal();
-            return true;
+            // CraftBukkit start - return portalcreator
+            return blockportal_shape.createPortal();
+            // return true;
+            // CraftBukkit end
         } else {
             return false;
         }
@@ -85,6 +94,10 @@
     @Override
     public void a(IBlockData iblockdata, World world, BlockPosition blockposition, Entity entity) {
         if (!entity.isPassenger() && !entity.isVehicle() && entity.canPortal()) {
+            // CraftBukkit start - Entity in portal
+            EntityPortalEnterEvent event = new EntityPortalEnterEvent(entity.getBukkitEntity(), new org.bukkit.Location(world.getWorld(), blockposition.getX(), blockposition.getY(), blockposition.getZ()));
+            world.getServer().getPluginManager().callEvent(event);
+            // CraftBukkit end
             entity.c(blockposition);
         }
 
@@ -177,6 +190,7 @@
         private BlockPosition position;
         private int height;
         private int width;
+        java.util.Collection<org.bukkit.block.Block> blocks = new java.util.HashSet<org.bukkit.block.Block>(); // CraftBukkit - add field
 
         public Shape(GeneratorAccess generatoraccess, BlockPosition blockposition, EnumDirection.EnumAxis enumdirection_enumaxis) {
             this.a = generatoraccess;
@@ -235,6 +249,9 @@
         }
 
         protected int c() {
+            // CraftBukkit start
+            this.blocks.clear();
+            // CraftBukkit end
             int i;
 
             label56:
@@ -257,11 +274,21 @@
                         block = this.a.getType(blockposition.shift(this.d)).getBlock();
                         if (block != Blocks.OBSIDIAN) {
                             break label56;
+                            // CraftBukkit start - add the block to our list
+                        } else {
+                            BlockPosition pos = blockposition.shift(this.d);
+                            blocks.add(CraftBlock.at(this.a, pos));
+                            // CraftBukkit end
                         }
                     } else if (i == this.width - 1) {
                         block = this.a.getType(blockposition.shift(this.c)).getBlock();
                         if (block != Blocks.OBSIDIAN) {
                             break label56;
+                            // CraftBukkit start - add the block to our list
+                        } else {
+                            BlockPosition pos = blockposition.shift(this.c);
+                            blocks.add(CraftBlock.at(this.a, pos));
+                            // CraftBukkit end
                         }
                     }
                 }
@@ -271,6 +298,11 @@
                 if (this.a.getType(this.position.shift(this.c, i).up(this.height)).getBlock() != Blocks.OBSIDIAN) {
                     this.height = 0;
                     break;
+                    // CraftBukkit start - add the block to our list
+                } else {
+                    BlockPosition pos = this.position.shift(this.c, i).up(this.height);
+                    blocks.add(CraftBlock.at(this.a, pos));
+                    // CraftBukkit end
                 }
             }
 
@@ -294,7 +326,27 @@
             return this.position != null && this.width >= 2 && this.width <= 21 && this.height >= 3 && this.height <= 21;
         }
 
-        public void createPortal() {
+        // CraftBukkit start - return boolean
+        public boolean createPortal() {
+            org.bukkit.World bworld = this.a.getMinecraftWorld().getWorld();
+
+            // Copy below for loop
+            for (int i = 0; i < this.width; ++i) {
+                BlockPosition blockposition = this.position.shift(this.c, i);
+
+                for (int j = 0; j < this.height; ++j) {
+                    BlockPosition pos = blockposition.up(j);
+                    blocks.add(bworld.getBlockAt(pos.getX(), pos.getY(), pos.getZ()));
+                }
+            }
+
+            PortalCreateEvent event = new PortalCreateEvent(blocks, bworld, PortalCreateEvent.CreateReason.FIRE);
+            this.a.getMinecraftWorld().getMinecraftServer().server.getPluginManager().callEvent(event);
+
+            if (event.isCancelled()) {
+                return false;
+            }
+            // CraftBukkit end
             for (int i = 0; i < this.width; ++i) {
                 BlockPosition blockposition = this.position.shift(this.c, i);
 
@@ -303,6 +355,7 @@
                 }
             }
 
+            return true; // CraftBukkit
         }
 
         private boolean g() {