From 3a6a0d80ef4b374752e507ce157e93937a55039e Mon Sep 17 00:00:00 2001
From: Marcos <98092901+chiteroman@users.noreply.github.com>
Date: Wed, 15 May 2024 11:04:49 +0200
Subject: [PATCH] Ignore invalid nicknames in AntiVanish (#344)

https://help.minecraft.net/hc/en-us/articles/4408950195341-Minecraft-Java-Edition-Username-VS-Gamertag-FAQ#h_01GE5JWW0210X02JZN2FP9CREC
---
 src/main/java/anticope/rejects/modules/AntiVanish.java | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/main/java/anticope/rejects/modules/AntiVanish.java b/src/main/java/anticope/rejects/modules/AntiVanish.java
index f85a2cf..aa6e84a 100644
--- a/src/main/java/anticope/rejects/modules/AntiVanish.java
+++ b/src/main/java/anticope/rejects/modules/AntiVanish.java
@@ -88,6 +88,8 @@ private void onPacket(PacketEvent.Receive event) {
 
                 for (String playerName : completionPlayerCache) {
                     if (Objects.equals(playerName, mc.player.getName().getString())) continue;
+                    if (playerName.contains(" ")) continue;
+                    if (playerName.length() < 3 || playerName.length() > 16) continue;
                     if (joinedOrQuit.test(playerName)) {
                         info("Player joined: " + playerName);
                     }
@@ -95,6 +97,8 @@ private void onPacket(PacketEvent.Receive event) {
 
                 for (String playerName : lastUsernames) {
                     if (Objects.equals(playerName, mc.player.getName().getString())) continue;
+                    if (playerName.contains(" ")) continue;
+                    if (playerName.length() < 3 || playerName.length() > 16) continue;
                     if (joinedOrQuit.test(playerName)) {
                         info("Player left: " + playerName);
                     }
@@ -124,6 +128,8 @@ private void onTick(TickEvent.Post event) {
                 for (UUID uuid : oldPlayers.keySet()) {
                     if (playerCache.containsKey(uuid)) continue;
                     String name = oldPlayers.get(uuid);
+                    if (name.contains(" ")) continue;
+                    if (name.length() < 3 || name.length() > 16) continue;
                     if (messageCache.stream().noneMatch(s -> s.contains(name))) {
                         warning(name + " has gone into vanish.");
                     }