Initial work on new inventory system

src/main/java/cn/nukkit/network/protocol/types/ItemStackRequest.java

@@ -0,0 +1,11 @@
+package cn.nukkit.network.protocol.types;
+
+import lombok.ToString;
+
+@ToString
+public class ItemStackRequest {
+    public int requestId;
+    public ItemStackRequestAction[] actions;
+    public String[] filterStrings;
+    public int filterStringCause;
+}

src/main/java/cn/nukkit/network/protocol/types/ItemStackRequestAction.java

@@ -0,0 +1,5 @@
+package cn.nukkit.network.protocol.types;
+
+public interface ItemStackRequestAction {
+    ItemStackRequestActionType getType();
+}

src/main/java/cn/nukkit/network/protocol/types/ItemStackRequestActionType.java

@@ -0,0 +1,24 @@
+package cn.nukkit.network.protocol.types;
+
+public enum ItemStackRequestActionType {
+    TAKE,
+    PLACE,
+    SWAP,
+    DROP,
+    DESTROY,
+    CONSUME,
+    CREATE,
+    PLACE_IN_ITEM_CONTAINER,
+    TAKE_FROM_ITEM_CONTAINER,
+    LAB_TABLE_COMBINE,
+    BEACON_PAYMENT,
+    MINE_BLOCK,
+    CRAFT_RECIPE,
+    CRAFT_RECIPE_AUTO,
+    CRAFT_CREATIVE,
+    CRAFT_RECIPE_OPTIONAL,
+    CRAFT_REPAIR_AND_DISENCHANT,
+    CRAFT_LOOM,
+    CRAFT_NON_IMPLEMENTED_DEPRECATED,
+    CRAFT_RESULTS_DEPRECATED,
+}

src/main/java/cn/nukkit/network/protocol/types/ItemStackResponse.java

@@ -0,0 +1,15 @@
+package cn.nukkit.network.protocol.types;
+
+import lombok.ToString;
+
+@ToString
+public class ItemStackResponse {
+    public static final int RESULT_OK = 0;
+    public static final int RESULT_ERROR = 1;
+
+    private static final ItemStackResponseContainerInfo[] EMPTY_CONTAINERS = new ItemStackResponseContainerInfo[0];
+
+    public int result = RESULT_OK;
+    public int requestId;
+    public ItemStackResponseContainerInfo[] containerInfos = EMPTY_CONTAINERS;
+}

src/main/java/cn/nukkit/network/protocol/types/ItemStackResponseContainerInfo.java

@@ -0,0 +1,18 @@
+package cn.nukkit.network.protocol.types;
+
+import lombok.ToString;
+
+import javax.annotation.Nullable;
+
+@ToString
+public class ItemStackResponseContainerInfo {
+    private static final ItemStackResponseSlotInfo[] EMPTY_SLOTS = new ItemStackResponseSlotInfo[0];
+
+    public int containerId;
+    /**
+     * @since 1.21.20
+     */
+    @Nullable
+    public Integer dynamicContainerId;
+    public ItemStackResponseSlotInfo[] slots = EMPTY_SLOTS;
+}

src/main/java/cn/nukkit/network/protocol/types/ItemStackResponseSlotInfo.java

@@ -0,0 +1,23 @@
+package cn.nukkit.network.protocol.types;
+
+import lombok.ToString;
+
+@ToString
+public class ItemStackResponseSlotInfo {
+    public int slot;
+    public int hotbarSlot;
+    public int count;
+    public int itemStackId;
+    /**
+     * @since 1.16.200
+     */
+    public String customName = "";
+    /**
+     * @since 1.21.50
+     */
+    public String filteredCustomName = "";
+    /**
+     * @since 1.16.210
+     */
+    public int durabilityCorrection;
+}

src/main/java/cn/nukkit/utils/BinaryStream.java

@@ -25,6 +25,8 @@
 import cn.nukkit.nbt.tag.Tag;
 import cn.nukkit.network.protocol.BossEventPacket.BossBarColor;
 import cn.nukkit.network.protocol.types.EntityLink;
+import cn.nukkit.network.protocol.types.ItemStackRequest;
+import cn.nukkit.network.protocol.types.ItemStackResponse;
 import it.unimi.dsi.fastutil.io.FastByteArrayInputStream;
 import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet;
@@ -1349,8 +1351,14 @@ public int getItemNetworkId(BinaryStream stream, Item item) {
         /**
          * @since 1.16.0
          */
-        public int getItemStackRequest(BinaryStream stream) { //TODO: server authoritative inventory
-            return -1;
+        public ItemStackRequest getItemStackRequest(BinaryStream stream) {
+            return null;
+        }
+
+        /**
+         * @since 1.16.0
+         */
+        public void putItemStackResponse(BinaryStream stream, ItemStackResponse response) {
         }
 
         public final int getCommandParameterTypeId(CommandParamType type) {