Support item provider on a 1.8 server

... 1.9 is on the way

bukkit/src/main/java/us/myles/ViaVersion/bukkit/protocol1_12to1_11_1/BukkitInvContainerUpdateTask.java

@@ -1,22 +1,55 @@
 package us.myles.ViaVersion.bukkit.protocol1_12to1_11_1;
 
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 import java.util.UUID;
 
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+
 import us.myles.ViaVersion.bukkit.providers.BukkitInvContainerItemProvider;
+import us.myles.ViaVersion.protocols.protocol1_12to1_11_1.storage.InvItemStorage;
 
 public class BukkitInvContainerUpdateTask implements Runnable {
 
     private BukkitInvContainerItemProvider provider;
-    private UUID uuid;
+    private final UUID uuid;
+    private final List<InvItemStorage> items;
 
     public BukkitInvContainerUpdateTask(BukkitInvContainerItemProvider provider, UUID uuid) {
         this.provider = provider;
         this.uuid = uuid;
+        this.items = Collections.synchronizedList(new ArrayList<>());
+    }
+
+    public void addItem(short windowId, short slotId, short anumber) {
+        InvItemStorage storage = new InvItemStorage(windowId, slotId, anumber);
+        items.add(storage);
     }
 
     @Override
     public void run() {
-        // TODO Auto-generated method stub
+        Player p = Bukkit.getServer().getPlayer(uuid);
+        if (p == null) {
+            provider.onTaskExecuted(uuid);
+            return;
+        }
+        try {
+            synchronized (items) {
+                for (InvItemStorage storage : items) {
+                    Object packet = provider.buildWindowClickPacket(p, storage);
+                    boolean result = provider.sendPlayer(p, packet);
+                    System.out.println("item result: " + result);
+                    if (!result) {
+                        break;
+                    }
+                }
+                System.out.println("items: " + items);
+                items.clear();
+            }
+        } finally {
             provider.onTaskExecuted(uuid);
         }
+    }
 }

bukkit/src/main/java/us/myles/ViaVersion/bukkit/providers/BukkitInvContainerItemProvider.java

@@ -1,28 +1,167 @@
 package us.myles.ViaVersion.bukkit.providers;
 
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.util.Map;
 import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
 
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.scheduler.BukkitScheduler;
+
 import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.api.protocol.ProtocolRegistry;
 import us.myles.ViaVersion.bukkit.protocol1_12to1_11_1.BukkitInvContainerUpdateTask;
+import us.myles.ViaVersion.bukkit.util.NMSUtil;
 import us.myles.ViaVersion.protocols.base.ProtocolInfo;
 import us.myles.ViaVersion.protocols.protocol1_12to1_11_1.providers.InvContainerItemProvider;
+import us.myles.ViaVersion.protocols.protocol1_12to1_11_1.storage.InvItemStorage;
+import us.myles.ViaVersion.util.ReflectionUtil;
 
 public class BukkitInvContainerItemProvider extends InvContainerItemProvider {
 
     private static Map<UUID, BukkitInvContainerUpdateTask> updateTasks = new ConcurrentHashMap<>();
+    private boolean supported;
+    // packet class
+    private Class<?> wclickPacketClass;
+    // Use for nms
+    private Method nmsItemMethod;
+    private Method ephandle;
+    private Field connection;
+    private Method packetMethod;
+
+    public BukkitInvContainerItemProvider() {
+        this.supported = isSupported();
+        setupReflection();
+    }
 
     @Override
     public boolean registerInvClickPacket(short windowId, short slotId, short anumber, UserConnection uconnection) {
+        if (!supported) {
+            return false;
+        }
         ProtocolInfo info = uconnection.get(ProtocolInfo.class);
-        // TODO: lets add some stuff here :)
+        UUID uuid = info.getUuid();
+        BukkitInvContainerUpdateTask utask = updateTasks.get(uuid);
+        final boolean registered = utask != null;
+        if (!registered) {
+            utask = new BukkitInvContainerUpdateTask(this, uuid);
+            updateTasks.put(uuid, utask);
+        }
         // http://wiki.vg/index.php?title=Protocol&oldid=13223#Click_Window
-        System.out.println("info: " + info + " QUICK ACTION windowId: " + windowId + " slotId: " + slotId + " button: " + 0 + " anumber: " + anumber + " mode: " + 1);
+        utask.addItem(windowId, slotId, anumber);
-        return false; // change to true once supported
+        if (!registered) {
+            scheduleTask(utask);
+        }
+        return true;
+    }
+
+    public Object buildWindowClickPacket(Player p, InvItemStorage storage) {
+        if (!supported) {
+            return null;
+        }
+        InventoryView inv = p.getOpenInventory();
+        short slotId = storage.getSlotId();
+        if (slotId > inv.countSlots()) {
+            return null; // wrong container open?
+        }
+        ItemStack itemstack = inv.getItem(slotId);
+        if (itemstack == null) {
+            return null;
+        }
+        Object cinstance = null;
+        try {
+            Object nmsItem = nmsItemMethod.invoke(null, itemstack);
+            // TODO: PASSTHROUGH PROTOCOLS? (Make InvItemStorage inheritance from Item?)
+            cinstance = wclickPacketClass.newInstance();
+            ReflectionUtil.set(cinstance, "a", (int) storage.getWindowId());
+            ReflectionUtil.set(cinstance, "slot", (int) slotId);
+            ReflectionUtil.set(cinstance, "button", 0); // shift + left mouse click
+            ReflectionUtil.set(cinstance, "d", storage.getActionNumber());
+            ReflectionUtil.set(cinstance, "item", nmsItem);
+            // TODO: THIS MUST BE AN ENUM on 1.9+ SERVERS!!
+            ReflectionUtil.set(cinstance, "shift", 1); // mode
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return cinstance;
+    }
+
+    public boolean sendPlayer(Player p, Object packet) {
+        if (packet == null) {
+            return false;
+        }
+        try {
+            Object entityPlayer = ephandle.invoke(p);
+            Object pconnection = connection.get(entityPlayer);
+            // send
+            packetMethod.invoke(pconnection, packet);
+        } catch (IllegalAccessException | InvocationTargetException e) {
+            e.printStackTrace();
+            return false;
+        }
+        return true;
     }
 
     public void onTaskExecuted(UUID uuid) {
         updateTasks.remove(uuid);
     }
+
+    private void scheduleTask(BukkitInvContainerUpdateTask utask) {
+        BukkitScheduler scheduler = Bukkit.getServer().getScheduler();
+        Plugin instance = Bukkit.getServer().getPluginManager().getPlugin("ViaVersion");
+        scheduler.runTaskLater(instance, utask, 5); // 5 ticks later.
+    }
+
+    private void setupReflection() {
+        if (!supported) {
+            return;
+        }
+        try {
+            this.wclickPacketClass = NMSUtil.nms("PacketPlayInWindowClick");
+            Class<?> citemStack = NMSUtil.obc("inventory.CraftItemStack");
+            this.nmsItemMethod = citemStack.getDeclaredMethod("asNMSCopy", ItemStack.class);
+        } catch (Exception e) {
+            this.supported = false;
+            return;
+        }
+        try {
+            this.ephandle = NMSUtil.obc("entity.CraftPlayer").getDeclaredMethod("getHandle");
+        } catch (NoSuchMethodException | ClassNotFoundException e) {
+            this.supported = false;
+            throw new RuntimeException("Couldn't find CraftPlayer", e);
+        }
+        try {
+            this.connection = NMSUtil.nms("EntityPlayer").getDeclaredField("playerConnection");
+        } catch (NoSuchFieldException | ClassNotFoundException e) {
+            this.supported = false;
+            throw new RuntimeException("Couldn't find Player Connection", e);
+        }
+        try {
+            this.packetMethod = NMSUtil.nms("PlayerConnection").getDeclaredMethod("a", wclickPacketClass);
+        } catch (NoSuchMethodException | ClassNotFoundException e) {
+            this.supported = false;
+            throw new RuntimeException("Couldn't find CraftPlayer", e);
+        }
+    }
+
+    private boolean isSupported() {
+        int protocolId = ProtocolRegistry.SERVER_PROTOCOL;
+        if (protocolId == 47) {
+            return true; // 1.8
+        } /**else if (protocolId >= 107 && protocolId <= 110) {
+            return true; // 1.9
+          } else if (protocolId == 210) {
+            return true; // 1.10
+          } else if (protocolId == 315 || protocolId == 316) {
+            return true; // 1.11
+          }*/
+        // this is not needed on 1.12+
+        return false;
+    }
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_12to1_11_1/storage/InvItemStorage.java

@@ -2,8 +2,10 @@ package us.myles.ViaVersion.protocols.protocol1_12to1_11_1.storage;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
+import lombok.ToString;
 
 @AllArgsConstructor
+@ToString
 @Getter
 public class InvItemStorage {