paper-server/patches/sources/net/minecraft/world/item/StandingAndWallBlockItem.java.patch


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--- a/net/minecraft/world/item/StandingAndWallBlockItem.java
+++ b/net/minecraft/world/item/StandingAndWallBlockItem.java
@@ -4,12 +4,17 @@
 import javax.annotation.Nullable;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
+import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.world.item.context.BlockPlaceContext;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.LevelReader;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.shapes.CollisionContext;
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+import org.bukkit.event.block.BlockCanBuildEvent;
+// CraftBukkit end
 
 public class StandingAndWallBlockItem extends BlockItem {
 
@@ -49,7 +54,19 @@
             }
         }
 
-        return iblockdata1 != null && world.isUnobstructed(iblockdata1, blockposition, CollisionContext.empty()) ? iblockdata1 : null;
+        // CraftBukkit start
+        if (iblockdata1 != null) {
+            boolean defaultReturn = world.isUnobstructed(iblockdata1, blockposition, CollisionContext.empty());
+            org.bukkit.entity.Player player = (context.getPlayer() instanceof ServerPlayer) ? (org.bukkit.entity.Player) context.getPlayer().getBukkitEntity() : null;
+
+            BlockCanBuildEvent event = new BlockCanBuildEvent(CraftBlock.at(world, blockposition), player, CraftBlockData.fromData(iblockdata1), defaultReturn, org.bukkit.craftbukkit.CraftEquipmentSlot.getHand(context.getHand())); // Paper - Expose hand in BlockCanBuildEvent
+            context.getLevel().getCraftServer().getPluginManager().callEvent(event);
+
+            return (event.isBuildable()) ? iblockdata1 : null;
+        } else {
+            return null;
+        }
+        // CraftBukkit end
     }
 
     @Override