Warning with Version <1.12 + First forge analyzer attempts

src/de/steamwar/bungeecore/PlayerListener.java

@@ -1,5 +1,7 @@
 package de.steamwar.bungeecore;
 
+import com.google.common.io.ByteArrayDataOutput;
+import com.google.common.io.ByteStreams;
 import de.steamwar.bungeecore.commands.BauCommand;
 import de.steamwar.bungeecore.sql.BannedUserIPs;
 import de.steamwar.bungeecore.sql.WarkingUser;
@@ -11,13 +13,14 @@ import net.md_5.bungee.api.chat.ComponentBuilder;
 import net.md_5.bungee.api.chat.HoverEvent;
 import net.md_5.bungee.api.chat.TextComponent;
 import net.md_5.bungee.api.config.ServerInfo;
+import net.md_5.bungee.api.connection.Connection;
 import net.md_5.bungee.api.connection.ProxiedPlayer;
 import net.md_5.bungee.api.event.*;
 import net.md_5.bungee.api.plugin.Listener;
 import net.md_5.bungee.event.EventHandler;
 
+import java.util.Arrays;
 import java.util.List;
-import java.util.Map;
 
 public class PlayerListener implements Listener {
 
@@ -110,12 +113,22 @@ public class PlayerListener implements Listener {
                 break;
         }
 
-        Map<String, String> modlist = player.getModList();
-        for(String key : modlist.keySet()){
-            System.out.println(key + " > " + modlist.get(key));
+        if(player.getPendingConnection().getVersion() < 335){
+            player.sendMessage(BungeeCore.ChatPrefix + "§cWir empfehlen die Minecraft-Version 1.12.2");
         }
-        if(player.isForgeUser())
-            System.out.println("Forge user!");
+
+        ByteArrayDataOutput output = ByteStreams.newDataOutput();
+        output.writeUTF("FML|HS");
+
+        if(player.getPendingConnection().getVersion() > 340){
+            //1.13+
+            player.sendData("minecraft:register", output.toByteArray());
+        }else{
+            //1.12-
+            player.sendData("REGISTER", output.toByteArray());
+        }
+
+        player.sendData("FML|HS", new byte[]{0, 2, 0, 0, 0, 0});
     }
 
     /** To redirect players to the lobby in case of server closure. */
@@ -235,4 +248,93 @@ public class PlayerListener implements Listener {
             }
         }
     }
+
+    @EventHandler
+    public void onPluginMessageEvent(PluginMessageEvent e){
+        System.out.println(e.getSender().getAddress().getHostString() + " " + e.getTag() + " " + Arrays.toString(e.getData()));
+
+        if(!e.getTag().equals("FML|HS")){
+            return;
+        }
+        e.setCancelled(true);
+        byte[] data = e.getData();
+        ProxiedPlayer p = getPlayer(e.getSender());
+        switch(data[0]){
+            case 2:
+                int numMods = readVarInt(data, 1);
+                System.out.println("Number of mods: " + numMods);
+                int bytePos = 1 + readVarIntLength(data, 1);
+                for(int i = 0; i < numMods; i++){
+                    byte[] name = Arrays.copyOfRange(data, bytePos + 1, bytePos + data[bytePos] + 1);
+                    bytePos += 1 + data[bytePos];
+                    byte[] version = Arrays.copyOfRange(data, bytePos + 1, bytePos + data[bytePos] + 1);
+                    bytePos += 1 + data[bytePos];
+
+                    System.out.println(new String(name) + " " + new String(version));
+                }
+
+                p.sendData("FML|HS", new byte[]{2, 0});
+                //p.sendData("FML|HS", new byte[]{2, 1, 9, 109, 105, 110, 101, 99, 114, 97, 102, 116, 6, 49, 46, 49, 50, 46, 50});
+                break;
+            case -1:
+                switch(data[1]){
+                    case 2:
+                        p.sendData("FML|HS", new byte[]{3, 0, 1, 97, 0, 0, 0});
+                        break;
+                    case 3:
+                        p.sendData("FML|HS", new byte[]{-1, 2});
+                        break;
+                    case 4:
+                        p.sendData("FML|HS", new byte[]{-1, 3});
+                        break;
+                    default:
+                        break;
+                }
+                break;
+            case 1:
+            default:
+                break;
+        }
+    }
+
+    private static ProxiedPlayer getPlayer(Connection c){
+        for(ProxiedPlayer p : ProxyServer.getInstance().getPlayers()){
+            if(p.getPendingConnection().getAddress().equals(c.getAddress())){
+                return p;
+            }
+        }
+        return null;
+    }
+
+    private static int readVarInt(byte[] array, int startPos) {
+        int numRead = 0;
+        int result = 0;
+        byte read;
+        do {
+            read = array[startPos + numRead];
+            int value = (read & 0b01111111);
+            result |= (value << (7 * numRead));
+
+            numRead++;
+            if (numRead > 5) {
+                break;
+            }
+        } while ((read & 0b10000000) != 0);
+
+        return result;
+    }
+
+    private static int readVarIntLength(byte[] array, int startPos) {
+        int numRead = 0;
+        byte read;
+        do {
+            read = array[startPos + numRead];
+            numRead++;
+            if (numRead > 5) {
+                break;
+            }
+        } while ((read & 0b10000000) != 0);
+
+        return numRead;
+    }
 }