Implement material crafting

src/main/java/emu/nebula/server/handlers/HandlerItemProductReq.java

@@ -0,0 +1,28 @@
+package emu.nebula.server.handlers;
+
+import emu.nebula.net.NetHandler;
+import emu.nebula.net.NetMsgId;
+import emu.nebula.proto.ItemProduct.ItemProductReq;
+import emu.nebula.net.HandlerId;
+import emu.nebula.net.GameSession;
+
+@HandlerId(NetMsgId.item_product_req)
+public class HandlerItemProductReq extends NetHandler {
+
+    @Override
+    public byte[] handle(GameSession session, byte[] message) throws Exception {
+        // Parse request
+        var req = ItemProductReq.parseFrom(message);
+        
+        // Produce item
+        var changes = session.getPlayer().getInventory().produce(req.getId(), req.getNum());
+        
+        if (changes == null) {
+            return this.encodeMsg(NetMsgId.item_product_failed_ack);
+        }
+        
+        // Send response
+        return this.encodeMsg(NetMsgId.item_product_succeed_ack, changes.toProto());
+    }
+
+}