PaperMC/nms-patches/ItemBlock.patch

--- a/net/minecraft/server/ItemBlock.java
+++ b/net/minecraft/server/ItemBlock.java
@@ -2,6 +2,11 @@
 
 import java.util.Map;
 import javax.annotation.Nullable;
+// CraftBukkit start
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+import org.bukkit.event.block.BlockCanBuildEvent;
+// CraftBukkit end
 
 public class ItemBlock extends Item {
 
@@ -45,7 +50,7 @@
 
                 SoundEffectType soundeffecttype = block.getStepSound();
 
-                world.a(entityhuman, blockposition, soundeffecttype.e(), SoundCategory.BLOCKS, (soundeffecttype.a() + 1.0F) / 2.0F, soundeffecttype.b() * 0.8F);
+                // world.a(entityhuman, blockposition, soundeffecttype.e(), SoundCategory.BLOCKS, (soundeffecttype.a() + 1.0F) / 2.0F, soundeffecttype.b() * 0.8F); // CraftBukkit - SPIGOT-1288
                 itemstack.subtract(1);
                 return EnumInteractionResult.SUCCESS;
             }
@@ -64,7 +69,14 @@
     }
 
     protected boolean b(BlockActionContext blockactioncontext, IBlockData iblockdata) {
-        return iblockdata.canPlace(blockactioncontext.getWorld(), blockactioncontext.getClickPosition()) && blockactioncontext.getWorld().a(iblockdata, blockactioncontext.getClickPosition());
+        // CraftBukkit start - store default return
+        boolean defaultReturn = iblockdata.canPlace(blockactioncontext.getWorld(), blockactioncontext.getClickPosition()) && blockactioncontext.getWorld().a(iblockdata, blockactioncontext.getClickPosition());
+
+        BlockCanBuildEvent event = new BlockCanBuildEvent(CraftBlock.at(blockactioncontext.getWorld(), blockactioncontext.getClickPosition()), CraftBlockData.fromData(iblockdata), defaultReturn);
+        blockactioncontext.getWorld().getServer().getPluginManager().callEvent(event);
+
+        return event.isBuildable();
+        // CraftBukkit end
     }
 
     protected boolean a(BlockActionContext blockactioncontext, IBlockData iblockdata) {