From d5b32107000bf8c391239d2f9372bd50ccfcde4e Mon Sep 17 00:00:00 2001
From: JustAHuman-xD <imjustahuman.xd@gmail.com>
Date: Sat, 23 May 2026 12:18:05 -0500
Subject: [PATCH 1/2] add event

---
 .../event/entity/GolemConstructEvent.java     | 62 +++++++++++++++++++
 .../level/block/CarvedPumpkinBlock.java.patch | 12 +++-
 2 files changed, 73 insertions(+), 1 deletion(-)
 create mode 100644 paper-api/src/main/java/io/papermc/paper/event/entity/GolemConstructEvent.java

diff --git a/paper-api/src/main/java/io/papermc/paper/event/entity/GolemConstructEvent.java b/paper-api/src/main/java/io/papermc/paper/event/entity/GolemConstructEvent.java
new file mode 100644
index 000000000000..c0853ab96c20
--- /dev/null
+++ b/paper-api/src/main/java/io/papermc/paper/event/entity/GolemConstructEvent.java
@@ -0,0 +1,62 @@
+package io.papermc.paper.event.entity;
+
+import org.bukkit.block.Block;
+import org.bukkit.entity.Golem;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.entity.EntityEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Unmodifiable;
+import org.jspecify.annotations.NullMarked;
+import java.util.List;
+
+/**
+ * Called just before a {@link Golem} spawns due to a pattern of blocks being constructed.
+ */
+@NullMarked
+public class GolemConstructEvent extends EntityEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final List<Block> blocks;
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public GolemConstructEvent(Golem golem, List<Block> blocks) {
+        super(golem);
+        this.blocks = List.copyOf(blocks);
+    }
+
+    @Override
+    public Golem getEntity() {
+        return (Golem) super.getEntity();
+    }
+
+    /**
+     * Get an immutable list of the blocks for this golem
+     *
+     * @return the golem blocks
+     */
+    public @Unmodifiable List<Block> getBlocks() {
+        return blocks;
+    }
+
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}
diff --git a/paper-server/patches/sources/net/minecraft/world/level/block/CarvedPumpkinBlock.java.patch b/paper-server/patches/sources/net/minecraft/world/level/block/CarvedPumpkinBlock.java.patch
index 53f2111574c8..ce9a06013c66 100644
--- a/paper-server/patches/sources/net/minecraft/world/level/block/CarvedPumpkinBlock.java.patch
+++ b/paper-server/patches/sources/net/minecraft/world/level/block/CarvedPumpkinBlock.java.patch
@@ -8,7 +8,7 @@
                  this.replaceCopperBlockWithChest(level, copperGolemMatch);
                  copperGolem.spawn(this.getWeatherStateFromPattern(copperGolemMatch));
              }
-@@ -105,9 +_,22 @@
+@@ -105,9 +_,32 @@
      }
  
      private static void spawnGolemInWorld(final Level level, final BlockPattern.BlockPatternMatch match, final Entity golem, final BlockPos spawnPos) {
@@ -17,6 +17,16 @@
          golem.snapTo(spawnPos.getX() + 0.5, spawnPos.getY() + 0.05, spawnPos.getZ() + 0.5, 0.0F, 0.0F);
 -        level.addFreshEntity(golem);
 +        // Paper start
++        java.util.List<org.bukkit.block.Block> blocks = new java.util.ArrayList<>();
++        for (int x = 0; x < match.getWidth(); x++) {
++            for (int y = 0; y < match.getHeight(); y++) {
++                BlockInWorld block = match.getBlock(x, y, 0);
++                blocks.add(org.bukkit.craftbukkit.block.CraftBlock.at(level, block.getPos()));
++            }
++        }
++        if (!new io.papermc.paper.event.entity.GolemConstructEvent((org.bukkit.entity.Golem) golem.getBukkitEntity(), blocks).callEvent()) {
++            return;
++        }
 +        org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason spawnReason;
 +        if (golem.getType() == net.minecraft.world.entity.EntityType.SNOW_GOLEM) {
 +            spawnReason = org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.BUILD_SNOWMAN;

From d2045a235f45d29cf13cacb8aedda4aba4c0d70c Mon Sep 17 00:00:00 2001
From: JustAHuman-xD <imjustahuman.xd@gmail.com>
Date: Sat, 23 May 2026 12:29:36 -0500
Subject: [PATCH 2/2] better javadoc

---
 .../io/papermc/paper/event/entity/GolemConstructEvent.java    | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/paper-api/src/main/java/io/papermc/paper/event/entity/GolemConstructEvent.java b/paper-api/src/main/java/io/papermc/paper/event/entity/GolemConstructEvent.java
index c0853ab96c20..5f466ed97c29 100644
--- a/paper-api/src/main/java/io/papermc/paper/event/entity/GolemConstructEvent.java
+++ b/paper-api/src/main/java/io/papermc/paper/event/entity/GolemConstructEvent.java
@@ -5,6 +5,7 @@
 import org.bukkit.event.Cancellable;
 import org.bukkit.event.HandlerList;
 import org.bukkit.event.entity.EntityEvent;
+import org.bukkit.event.entity.EntitySpawnEvent;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.Unmodifiable;
 import org.jspecify.annotations.NullMarked;
@@ -12,6 +13,9 @@
 
 /**
  * Called just before a {@link Golem} spawns due to a pattern of blocks being constructed.
+ * <br>
+ * Note: This event is fired before {@link EntitySpawnEvent}, before the golem is added to the world,
+ * the success of this event does not guarantee the golem will actually spawn.
  */
 @NullMarked
 public class GolemConstructEvent extends EntityEvent implements Cancellable {