Stopping usage of fabric mod launcher

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/BungeeCore.java

@@ -2,6 +2,7 @@ package de.steamwar.bungeecore;
 
 import de.steamwar.bungeecore.commands.*;
 import de.steamwar.bungeecore.listeners.*;
+import de.steamwar.bungeecore.listeners.mods.Fabric;
 import de.steamwar.bungeecore.listeners.mods.Forge;
 import de.steamwar.bungeecore.listeners.mods.LabyMod;
 import de.steamwar.bungeecore.sql.SQL;
@@ -56,6 +57,7 @@ public class BungeeCore extends Plugin {
         new ConnectionListener();
         new Forge();
         new LabyMod();
+        new Fabric();
         new ChatListener();
         new BanListener();
         new CheckListener();

src/de/steamwar/bungeecore/listeners/mods/Fabric.java

@@ -0,0 +1,26 @@
+package de.steamwar.bungeecore.listeners.mods;
+
+import de.steamwar.bungeecore.BungeeCore;
+import de.steamwar.bungeecore.listeners.BasicListener;
+import net.md_5.bungee.api.connection.Connection;
+import net.md_5.bungee.api.connection.ProxiedPlayer;
+import net.md_5.bungee.api.event.PluginMessageEvent;
+import net.md_5.bungee.event.EventHandler;
+
+public class Fabric extends BasicListener {
+
+    @EventHandler
+    public void onPluginMessageEvent(PluginMessageEvent e){
+        Connection sender = e.getSender();
+        if(!(sender instanceof ProxiedPlayer))
+            return;
+
+        if(!e.getTag().equals("minecraft:brand"))
+            return;
+
+        if(new String(e.getData()).contains("fabric")){
+            ProxiedPlayer p = (ProxiedPlayer) sender;
+            p.disconnect(BungeeCore.stringToText("§7Die Verwendung von Fabric ist auf §eSteam§8War §7nicht gestattet."));
+        }
+    }
+}