Added offhand command (#412)

connector/src/main/java/org/geysermc/connector/command/CommandManager.java

@@ -28,10 +28,7 @@ package org.geysermc.connector.command;
 import lombok.Getter;
 import org.geysermc.common.command.ICommandManager;
 import org.geysermc.connector.GeyserConnector;
-import org.geysermc.connector.command.defaults.HelpCommand;
-import org.geysermc.connector.command.defaults.ListCommand;
-import org.geysermc.connector.command.defaults.ReloadCommand;
-import org.geysermc.connector.command.defaults.StopCommand;
+import org.geysermc.connector.command.defaults.*;
 
 import java.util.Collections;
 import java.util.HashMap;
@@ -51,6 +48,7 @@ public abstract class CommandManager implements ICommandManager {
         registerCommand(new ListCommand(connector, "list", "List all players connected through Geyser.", "geyser.command.list"));
         registerCommand(new ReloadCommand(connector, "reload", "Reloads the Geyser configurations. Kicks all players when used!", "geyser.command.reload"));
         registerCommand(new StopCommand(connector, "stop", "Shuts down Geyser.", "geyser.command.stop"));
+        registerCommand(new OffhandCommand(connector, "offhand", "Puts an items in your offhand.", "geyser.command.offhand"));
     }
 
     public void registerCommand(GeyserCommand command) {

connector/src/main/java/org/geysermc/connector/command/defaults/OffhandCommand.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2019-2020 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.connector.command.defaults;
+
+import com.github.steveice10.mc.protocol.data.game.entity.metadata.Position;
+import com.github.steveice10.mc.protocol.data.game.entity.player.PlayerAction;
+import com.github.steveice10.mc.protocol.data.game.world.block.BlockFace;
+import com.github.steveice10.mc.protocol.packet.ingame.client.player.ClientPlayerActionPacket;
+import org.geysermc.connector.GeyserConnector;
+import org.geysermc.connector.command.CommandSender;
+import org.geysermc.connector.command.GeyserCommand;
+import org.geysermc.connector.network.session.GeyserSession;
+
+public class OffhandCommand extends GeyserCommand {
+
+    private GeyserConnector connector;
+
+    public OffhandCommand(GeyserConnector connector, String name, String description, String permission) {
+        super(name, description, permission);
+
+        this.connector = connector;
+    }
+
+    @Override
+    public void execute(CommandSender sender, String[] args) {
+        if (sender.isConsole()) {
+            return;
+        }
+
+        // Make sure the sender is a Bedrock edition client
+        if (sender instanceof GeyserSession) {
+            GeyserSession session = (GeyserSession) sender;
+            ClientPlayerActionPacket releaseItemPacket = new ClientPlayerActionPacket(PlayerAction.SWAP_HANDS, new Position(0,0,0),
+                    BlockFace.DOWN);
+            session.getDownstream().getSession().send(releaseItemPacket);
+        }
+    }
+}