From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Dreeam <61569423+Dreeam-qwq@users.noreply.github.com>
Date: Wed, 12 Oct 2022 14:36:58 -0400
Subject: [PATCH] Remove vanilla username check


diff --git a/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 6d320ed179393e47398c44f2ba2b2285016f349e..79534beb5f4a3427078541fda287d9c950999c96 100644
--- a/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -163,7 +163,8 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
     public void handleHello(ServerboundHelloPacket packet) {
         Validate.validState(this.state == ServerLoginPacketListenerImpl.State.HELLO, "Unexpected hello packet");
         // Paper start - Validate usernames
-        if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.isProxyOnlineMode()
+        if (!org.dreeam.leaf.config.modules.misc.RemoveVanillaUsernameCheck.enabled // Leaf - Remove vanilla username check
+            && io.papermc.paper.configuration.GlobalConfiguration.get().proxies.isProxyOnlineMode()
             && io.papermc.paper.configuration.GlobalConfiguration.get().unsupportedSettings.performUsernameValidation
             && !this.iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation) {
             Validate.validState(StringUtil.isReasonablePlayerName(packet.name()), "Invalid characters in username");
diff --git a/net/minecraft/server/players/GameProfileCache.java b/net/minecraft/server/players/GameProfileCache.java
index 066f84df5c31242ab542932f1e243369d0e766e2..4faa87d18c2e55d6320f9e8ec91862b9e58d26b5 100644
--- a/net/minecraft/server/players/GameProfileCache.java
+++ b/net/minecraft/server/players/GameProfileCache.java
@@ -75,7 +75,7 @@ public class GameProfileCache {
     }
 
     private static Optional<GameProfile> lookupGameProfile(GameProfileRepository profileRepo, String name) {
-        if (!StringUtil.isValidPlayerName(name)) {
+        if (!StringUtil.isValidPlayerName(name, false)) { // Leaf start - Remove vanilla username check - Directly return, skip unnecessary following logic
             return createUnknownProfile(name);
         } else {
             final boolean shouldLookup = !org.apache.commons.lang3.StringUtils.isBlank(name)  // Paper - Don't lookup a profile with a blank name
diff --git a/net/minecraft/util/StringUtil.java b/net/minecraft/util/StringUtil.java
index c3a99fe7b49858bc0ca9a7f800b0db40465f6901..863c62f076723a4c71a1d07bdc9cc8f9f1739886 100644
--- a/net/minecraft/util/StringUtil.java
+++ b/net/minecraft/util/StringUtil.java
@@ -64,6 +64,12 @@ public class StringUtil {
     }
 
     public static boolean isValidPlayerName(String playerName) {
+        // Leaf start - Remove vanilla username check
+        return isValidPlayerName(playerName, org.dreeam.leaf.config.modules.misc.RemoveVanillaUsernameCheck.enabled);
+    }
+    public static boolean isValidPlayerName(String playerName, boolean bypassCheck) {
+        if (bypassCheck) return playerName.length() <= 16;
+        // Leaf end- Remove vanilla username check
         return playerName.length() <= 16 && playerName.chars().filter(i -> i <= 32 || i >= 127).findAny().isEmpty();
     }