Added CanPlaceOn and CanDestroy properties for ItemStacks and implemented checks for them

src/main/java/net/minestom/server/item/ItemStack.java

@@ -67,6 +67,9 @@ public class ItemStack implements DataContainer, PublicCloneable<ItemStack> {
     private StackingRule stackingRule;
     private Data data;
 
+    private Set<String> canDestroy;
+    private Set<String> canPlaceOn;
+
     {
         if (defaultStackingRule == null)
             defaultStackingRule = VANILLA_STACKING_RULE;
@@ -83,6 +86,9 @@ public class ItemStack implements DataContainer, PublicCloneable<ItemStack> {
         this.enchantmentMap = new Object2ShortOpenHashMap<>();
         this.attributes = new ArrayList<>();
 
+        this.canDestroy = new HashSet<>();
+        this.canPlaceOn = new HashSet<>();
+
         this.itemMeta = findMeta();
     }
 
@@ -195,6 +201,76 @@ public class ItemStack implements DataContainer, PublicCloneable<ItemStack> {
                 isSimilar((ItemStack) o) && ((ItemStack) o).getAmount() == getAmount();
     }
 
+    /**
+     * Checks if this item can be placed on the block.
+     * This should be enforced only for adventure mode players.
+     * @param block the block's namespaceID
+     * @return <code>true</code> if it can be placed, <code>false</code> otherwise
+     */
+    public boolean canPlaceOn(String block) {
+        return canPlaceOn.contains(block);
+    }
+
+    /**
+     * Adds the block to the list of blocks that
+     * this item can be placed on.
+     * @param block the block's namespaceID
+     */
+    public void addCanPlaceOn(String block) {
+        canPlaceOn.add(block);
+    }
+
+    /**
+     * Removes the block from the set of blocks that
+     * this item can be placed on.
+     * @param block the block's namespaceID
+     */
+    public void removeCanPlaceOn(String block) {
+        canPlaceOn.remove(block);
+    }
+
+    /**
+     * Gets the blocks that this item can be placed on
+     * @return an unmodifiable {@link Set} of blocks
+     */
+    public Set<String> getCanPlaceOn() {
+        return Collections.unmodifiableSet(canPlaceOn);
+    }
+
+    /**
+     * Checks if this item is allowed to break the provided block.
+     * This should be enforced only for adventure mode players.
+     * @param block the block's namespaceID
+     * @return <code>true</code> if this item can destroy it, otherwise <code>false</code>
+     */
+    public boolean canDestroy(String block) {
+        return canDestroy.contains(block);
+    }
+
+    /**
+     * Adds the block to the set of blocks that can be destroyed by this item.
+     * @param block the block's namespaceID
+     */
+    public void addCanDestroy(String block) {
+        canDestroy.add(block);
+    }
+
+    /**
+     * Removes the block from the set of blocks that can be destroyed by this item.
+     * @param block the block's namespaceID
+     */
+    public void removeCanDestroy(String block) {
+        canDestroy.remove(block);
+    }
+
+    /**
+     * Gets the blocks that this item can destroy
+     * @return an unmodifiable {@link Set} of blocks
+     */
+    public Set<String> getCanDestroy() {
+        return Collections.unmodifiableSet(canDestroy);
+    }
+
     /**
      * Gets the item damage (durability).
      *
@@ -555,7 +631,9 @@ public class ItemStack implements DataContainer, PublicCloneable<ItemStack> {
                 hideFlag != 0 ||
                 customModelData != 0 ||
                 (itemMeta != null && itemMeta.hasNbt()) ||
-                (data != null && !data.isEmpty());
+                (data != null && !data.isEmpty()) ||
+                canDestroy.size() != 0 ||
+                canPlaceOn.size() != 0;
     }
 
     /**
@@ -594,6 +672,9 @@ public class ItemStack implements DataContainer, PublicCloneable<ItemStack> {
             itemStack.hideFlag = hideFlag;
             itemStack.customModelData = customModelData;
 
+            itemStack.canPlaceOn = new HashSet<>(canPlaceOn);
+            itemStack.canDestroy = new HashSet<>(canDestroy);
+
             if (itemMeta != null)
                 itemStack.itemMeta = itemMeta.clone();
 

src/main/java/net/minestom/server/listener/BlockPlacementListener.java

@@ -19,6 +19,8 @@ import net.minestom.server.inventory.PlayerInventory;
 import net.minestom.server.item.ItemStack;
 import net.minestom.server.item.Material;
 import net.minestom.server.network.packet.client.play.ClientPlayerBlockPlacementPacket;
+import net.minestom.server.network.packet.client.play.ClientPlayerDiggingPacket;
+import net.minestom.server.network.packet.server.play.BlockChangePacket;
 import net.minestom.server.utils.BlockPosition;
 import net.minestom.server.utils.Direction;
 import net.minestom.server.utils.chunk.ChunkUtils;
@@ -72,14 +74,19 @@ public class BlockPlacementListener {
         final Material useMaterial = usedItem.getMaterial();
 
         // Verify if the player can place the block
+        boolean canPlaceBlock = true;
         {
             if (useMaterial == Material.AIR) { // Can't place air
                 return;
             }
-            if (player.getGameMode().equals(GameMode.ADVENTURE)) { // Can't place in adventure mode
-                return;
-            }
 
+            //Check if the player is allowed to place blocks based on their game mode
+            if (player.getGameMode() == GameMode.SPECTATOR) {
+                canPlaceBlock = false; //Spectators can't place blocks
+            } else if (player.getGameMode() == GameMode.ADVENTURE) {
+                //Check if the block can placed on the block
+                canPlaceBlock = usedItem.canPlaceOn(instance.getBlock(blockPosition).getName());
+            }
         }
 
         // Get the newly placed block position
@@ -89,6 +96,16 @@ public class BlockPlacementListener {
 
         blockPosition.add(offsetX, offsetY, offsetZ);
 
+        if(!canPlaceBlock) {
+            //Send a block change with AIR as block to keep the client in sync,
+            //using refreshChunk results in the client not being in sync
+            //after rapid invalid block placements
+            BlockChangePacket blockChangePacket = new BlockChangePacket();
+            blockChangePacket.blockPosition = blockPosition;
+            blockChangePacket.blockStateId = Block.AIR.getBlockId();
+            player.getPlayerConnection().sendPacket(blockChangePacket);
+            return;
+        }
 
         final Chunk chunk = instance.getChunkAt(blockPosition);
 

src/main/java/net/minestom/server/listener/PlayerDiggingListener.java

@@ -1,5 +1,6 @@
 package net.minestom.server.listener;
 
+import net.minestom.server.entity.GameMode;
 import net.minestom.server.entity.Player;
 import net.minestom.server.event.item.ItemUpdateStateEvent;
 import net.minestom.server.event.player.PlayerStartDiggingEvent;
@@ -10,6 +11,7 @@ import net.minestom.server.instance.block.CustomBlock;
 import net.minestom.server.inventory.PlayerInventory;
 import net.minestom.server.item.ItemStack;
 import net.minestom.server.item.StackingRule;
+import net.minestom.server.item.attribute.ItemAttribute;
 import net.minestom.server.network.packet.client.play.ClientPlayerDiggingPacket;
 import net.minestom.server.network.packet.server.play.AcknowledgePlayerDiggingPacket;
 import net.minestom.server.network.packet.server.play.EntityEffectPacket;
@@ -17,6 +19,7 @@ import net.minestom.server.network.packet.server.play.RemoveEntityEffectPacket;
 import net.minestom.server.potion.Potion;
 import net.minestom.server.potion.PotionEffect;
 import net.minestom.server.utils.BlockPosition;
+import net.minestom.server.utils.NamespaceID;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
@@ -36,8 +39,23 @@ public class PlayerDiggingListener {
             return;
 
         if (status == ClientPlayerDiggingPacket.Status.STARTED_DIGGING) {
-
             final short blockStateId = instance.getBlockStateId(blockPosition);
+
+            //Check if the player is allowed to break blocks based on their game mode
+            if (player.getGameMode() == GameMode.SPECTATOR) {
+                sendAcknowledgePacket(player, blockPosition, blockStateId,
+                        ClientPlayerDiggingPacket.Status.STARTED_DIGGING, false);
+                return; //Spectators can't break blocks
+            } else if (player.getGameMode() == GameMode.ADVENTURE) {
+                //Check if the item can break the block with the current item
+                ItemStack itemInMainHand = player.getItemInMainHand();
+                if (!itemInMainHand.canDestroy(instance.getBlock(blockPosition).getName())) {
+                    sendAcknowledgePacket(player, blockPosition, blockStateId,
+                            ClientPlayerDiggingPacket.Status.STARTED_DIGGING, false);
+                    return;
+                }
+            }
+
             final boolean instantBreak = player.isCreative() ||
                     player.isInstantBreak() ||
                     Block.fromStateId(blockStateId).breaksInstantaneously();

src/main/java/net/minestom/server/utils/NBTUtils.java

@@ -26,10 +26,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.List;
-import java.util.Map;
-import java.util.UUID;
 
 // for lack of a better name
 public final class NBTUtils {
@@ -124,6 +121,7 @@ public final class NBTUtils {
         return item;
     }
 
+    @SuppressWarnings("ConstantConditions")
     public static void loadDataIntoItem(@NotNull ItemStack item, @NotNull NBTCompound nbt) {
         if (nbt.containsKey("Damage")) item.setDamage(nbt.getInt("Damage"));
         if (nbt.containsKey("Unbreakable")) item.setUnbreakable(nbt.getAsByte("Unbreakable") == 1);
@@ -222,6 +220,21 @@ public final class NBTUtils {
                 }
             }
         }
+
+        //CanPlaceOn
+        {
+            if (nbt.containsKey("CanPlaceOn")) {
+                NBTList<NBTString> canPlaceOn = nbt.getList("CanPlaceOn");
+                canPlaceOn.forEach(x -> item.addCanPlaceOn(x.getValue()));
+            }
+        }
+        //CanDestroy
+        {
+            if (nbt.containsKey("CanDestroy")) {
+                NBTList<NBTString> canPlaceOn = nbt.getList("CanDestroy");
+                canPlaceOn.forEach(x -> item.addCanDestroy(x.getValue()));
+            }
+        }
     }
 
     public static void loadEnchantments(NBTList<NBTCompound> enchantments, EnchantmentSetter setter) {
@@ -368,6 +381,26 @@ public final class NBTUtils {
             }
         }
         // End ownership
+
+        //CanDestroy
+        {
+            Set<String> canDestroy = itemStack.getCanDestroy();
+            if (canDestroy.size() > 0) {
+                NBTList<NBTString> list = new NBTList<>(NBTTypes.TAG_String);
+                canDestroy.forEach(x -> list.add(new NBTString(x.toString())));
+                itemNBT.set("CanDestroy", list);
+            }
+        }
+
+        //CanDestroy
+        {
+            Set<String> canPlaceOn = itemStack.getCanPlaceOn();
+            if (canPlaceOn.size() > 0) {
+                NBTList<NBTString> list = new NBTList<>(NBTTypes.TAG_String);
+                canPlaceOn.forEach(x -> list.add(new NBTString(x.toString())));
+                itemNBT.set("CanPlaceOn", list);
+            }
+        }
     }
 
     /**