Merge pull request 'Cannot spoof chat my ass' (#368) from spoofChat into master

Reviewed-on: SteamWar/BungeeCore#368
Reviewed-by: Chaoscaot <chaoscaot444@gmail.com>

src/de/steamwar/bungeecore/commands/TpCommand.java

@@ -21,6 +21,7 @@ package de.steamwar.bungeecore.commands;
 
 import de.steamwar.bungeecore.*;
 import de.steamwar.bungeecore.sql.*;
+import de.steamwar.bungeecore.util.Chat19;
 import de.steamwar.messages.ChatSender;
 import net.md_5.bungee.BungeeCord;
 import net.md_5.bungee.api.CommandSender;
@@ -55,7 +56,7 @@ public class TpCommand extends BasicCommand {
 
         //Give control of teleport command to server
         if(server == null) {
-            player.chat("/tp " + String.join(" ", args));
+            Chat19.chat(player, "/tp " + String.join(" ", args));
             return;
         }
 

src/de/steamwar/bungeecore/listeners/ChatListener.java

@@ -23,6 +23,7 @@ import de.steamwar.bungeecore.*;
 import de.steamwar.bungeecore.bot.SteamwarDiscordBot;
 import de.steamwar.bungeecore.comms.packets.PingPacket;
 import de.steamwar.bungeecore.sql.*;
+import de.steamwar.bungeecore.util.Chat19;
 import de.steamwar.messages.ChatSender;
 import net.md_5.bungee.api.*;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
@@ -123,7 +124,7 @@ public class ChatListener extends BasicListener {
                 return;
         }
 
-        player.chat(message);
+        Chat19.chat(player, message);
     }
 
     private static String modifyFilter(ChatSender sender, String message) {

src/de/steamwar/bungeecore/util/Chat19.java

@@ -0,0 +1,67 @@
+/*
+ * This file is a part of the SteamWar software.
+ *
+ * Copyright (C) 2022  SteamWar.de-Serverteam
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.bungeecore.util;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import net.md_5.bungee.ServerConnection;
+import net.md_5.bungee.api.connection.ProxiedPlayer;
+import net.md_5.bungee.protocol.PacketWrapper;
+import net.md_5.bungee.protocol.ProtocolConstants;
+import net.md_5.bungee.protocol.packet.Chat;
+
+import java.time.Instant;
+
+public class Chat19 extends Chat {
+
+    public static void chat(ProxiedPlayer p, String message) {
+        if(p.getPendingConnection().getVersion() >= 759) {
+            Chat19 packet = new Chat19(message);
+
+            ByteBuf buf = Unpooled.buffer();
+            writeVarInt(0x04, buf);
+            packet.write(buf, ProtocolConstants.Direction.TO_SERVER, p.getPendingConnection().getVersion());
+            ((ServerConnection) p.getServer()).getCh().write(new PacketWrapper(packet, buf));
+        } else {
+            p.chat(message);
+        }
+    }
+
+    private final Instant timestamp = Instant.now();
+    private final long salt = 0L;
+    private final byte[] signature = new byte[0];
+    private final boolean signedPreview = false;
+
+    public Chat19 (String message) {
+        super(message);
+    }
+
+    @Override
+    public void write(ByteBuf buf, ProtocolConstants.Direction direction, int protocolVersion) {
+        if (direction == ProtocolConstants.Direction.TO_CLIENT || protocolVersion != 759)
+            throw new UnsupportedOperationException();
+
+        writeString(getMessage(), buf);
+        buf.writeLong(timestamp.toEpochMilli());
+        buf.writeLong(salt);
+        writeArray(signature, buf);
+        buf.writeBoolean(signedPreview);
+    }
+}