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 Mojang username check


diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 5ed89ce9d2c29927f48c1f7f8f9288f39d68b56c..30371f1a6dfb6fc170ac0cbdb3a7c78c837429c2 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -37,6 +37,7 @@ import net.minecraft.util.Crypt;
 import net.minecraft.util.CryptException;
 import net.minecraft.util.RandomSource;
 import org.apache.commons.lang3.Validate;
+import org.dreeam.leaf.LeafConfig;
 import org.galemc.gale.configuration.GaleGlobalConfiguration;
 import org.slf4j.Logger;
 
@@ -245,10 +246,10 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
     public void handleHello(ServerboundHelloPacket packet) {
         // Gale start - JettPack - reduce array allocations
         Validate.validState(this.state == ServerLoginPacketListenerImpl.State.HELLO, "Unexpected hello packet", ArrayConstants.emptyObjectArray);
-        Validate.validState(ServerLoginPacketListenerImpl.isValidUsername(packet.name()), "Invalid characters in username", ArrayConstants.emptyObjectArray);
+        if (!LeafConfig.removeMojangUsernameCheck) Validate.validState(ServerLoginPacketListenerImpl.isValidUsername(packet.name()), "Invalid characters in username", ArrayConstants.emptyObjectArray); // Leaf - Remove Mojang's username check
         // Gale end - JettPack - reduce array allocations
         // Paper start - validate usernames
-        if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.isProxyOnlineMode() && io.papermc.paper.configuration.GlobalConfiguration.get().unsupportedSettings.performUsernameValidation) {
+        if (io.papermc.paper.configuration.GlobalConfiguration.get().proxies.isProxyOnlineMode() && io.papermc.paper.configuration.GlobalConfiguration.get().unsupportedSettings.performUsernameValidation && !LeafConfig.removeMojangUsernameCheck) { // Leaf - Remove Mojang's username check
             if (!this.iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation && !validateUsername(packet.name())) {
                 ServerLoginPacketListenerImpl.this.disconnect("Failed to verify username!");
                 return;
diff --git a/src/main/java/org/dreeam/leaf/LeafConfig.java b/src/main/java/org/dreeam/leaf/LeafConfig.java
index 37399feb26f51c0f198124444ed427056e3f9da4..79ff7e8ab613a77b663e81377e72d51c28894083 100644
--- a/src/main/java/org/dreeam/leaf/LeafConfig.java
+++ b/src/main/java/org/dreeam/leaf/LeafConfig.java
@@ -164,7 +164,11 @@ public class LeafConfig {
         return builder.build();
     }
 
+    public static boolean removeMojangUsernameCheck = true;
     private static void removal() {
+        removeMojangUsernameCheck = getBoolean("remove-Mojang-username-check", removeMojangUsernameCheck,
+                "Remove username check of Mojang",
+                "enabling all characters as username");
     }
 
     public static String sentryDsn = "";