PaperMC/nms-patches/EntityEnderman.patch

--- a/net/minecraft/server/EntityEnderman.java
+++ b/net/minecraft/server/EntityEnderman.java
@@ -52,7 +52,17 @@
 
     @Override
     public void setGoalTarget(@Nullable EntityLiving entityliving) {
-        super.setGoalTarget(entityliving);
+        // CraftBukkit start - fire event
+        setGoalTarget(entityliving, org.bukkit.event.entity.EntityTargetEvent.TargetReason.UNKNOWN, true);
+    }
+
+    @Override
+    public boolean setGoalTarget(EntityLiving entityliving, org.bukkit.event.entity.EntityTargetEvent.TargetReason reason, boolean fireEvent) {
+        if (!super.setGoalTarget(entityliving, reason, fireEvent)) {
+            return false;
+        }
+        entityliving = getGoalTarget();
+        // CraftBukkit end
         AttributeInstance attributeinstance = this.getAttributeInstance(GenericAttributes.MOVEMENT_SPEED);
 
         if (entityliving == null) {
@@ -67,6 +77,7 @@
                 attributeinstance.addModifier(EntityEnderman.c);
             }
         }
+        return true;
 
     }
 
@@ -323,8 +334,12 @@
             boolean flag = movingobjectpositionblock.getBlockPosition().equals(blockposition);
 
             if (block.a(TagsBlock.ENDERMAN_HOLDABLE) && flag) {
-                this.enderman.setCarried(iblockdata);
-                world.a(blockposition, false);
+                // CraftBukkit start - Pickup event
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(this.enderman, blockposition, Blocks.AIR.getBlockData()).isCancelled()) {
+                    this.enderman.setCarried(iblockdata);
+                    world.a(blockposition, false);
+                }
+                // CraftBukkit end
             }
 
         }
@@ -357,8 +372,12 @@
             IBlockData iblockdata2 = this.a.getCarried();
 
             if (iblockdata2 != null && this.a(world, blockposition, iblockdata2, iblockdata, iblockdata1, blockposition1)) {
+                // CraftBukkit start - Place event
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.callEntityChangeBlockEvent(this.a, blockposition, iblockdata2).isCancelled()) {
                 world.setTypeAndData(blockposition, iblockdata2, 3);
                 this.a.setCarried((IBlockData) null);
+                }
+                // CraftBukkit end
             }
 
         }