Leaf/leaf-server/minecraft-patches/features/0139-Cache-player-profileResult.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Dreeam <61569423+Dreeam-qwq@users.noreply.github.com>
Date: Thu, 28 Mar 2024 13:36:09 -0400
Subject: [PATCH] Cache player profileResult


diff --git a/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 9dce1d22c7de3a3dd0e0e8f117cfbb54d1b15042..6b0b0ccc18a5da05685867656705e1fcf94b5891 100644
--- a/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -70,6 +70,14 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
     private net.minecraft.server.level.ServerPlayer player; // CraftBukkit
     public boolean iKnowThisMayNotBeTheBestIdeaButPleaseDisableUsernameValidation = false; // Paper - username validation overriding
     private int velocityLoginMessageId = -1; // Paper - Add Velocity IP Forwarding Support
+    // Leaf start - Cache player profileResult
+    private static final com.github.benmanes.caffeine.cache.Cache<String, ProfileResult> playerProfileResultCache = com.github.benmanes.caffeine.cache.Caffeine.newBuilder()
+        .expireAfterWrite(org.dreeam.leaf.config.modules.misc.Cache.cachePlayerProfileResultTimeout, java.util.concurrent.TimeUnit.MINUTES)
+        .build();
+    private static final com.github.benmanes.caffeine.cache.Cache<String, InetAddress> playerSession = com.github.benmanes.caffeine.cache.Caffeine.newBuilder()
+        .expireAfterWrite(org.dreeam.leaf.config.modules.misc.Cache.cachePlayerProfileResultTimeout, java.util.concurrent.TimeUnit.MINUTES)
+        .build();
+    // Leaf end - Cache player profileResult
 
     public ServerLoginPacketListenerImpl(MinecraftServer server, Connection connection, boolean transferred) {
         this.server = server;
@@ -303,9 +311,30 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
                 String string1 = Objects.requireNonNull(ServerLoginPacketListenerImpl.this.requestedUsername, "Player name not initialized");
 
                 try {
-                    ProfileResult profileResult = ServerLoginPacketListenerImpl.this.server
-                        .getSessionService()
-                        .hasJoinedServer(string1, string, this.getAddress());
+                    // Leaf start - Cache player profileResult
+                    ProfileResult profileResult;
+                    if (org.dreeam.leaf.config.modules.misc.Cache.cachePlayerProfileResult) {
+                        profileResult = playerProfileResultCache.getIfPresent(string1);
+
+                        InetAddress address = this.getAddress();
+                        InetAddress lastAddress = playerSession.getIfPresent(string1);
+                        if (isInvalidSession(address, lastAddress)) {
+                            // Send request to mojang server to verify session
+                            // Result will be null if is invalid and will do disconnect logic below
+                            profileResult = ServerLoginPacketListenerImpl.this.server
+                                .getSessionService()
+                                .hasJoinedServer(string1, string, address);
+                            if (profileResult != null && address != null) {
+                                playerProfileResultCache.put(string1, profileResult);
+                                playerSession.put(string1, address);
+                            }
+                        }
+                    } else {
+                        profileResult = ServerLoginPacketListenerImpl.this.server
+                            .getSessionService()
+                            .hasJoinedServer(string1, string, this.getAddress());
+                    }
+                    // Leaf end - Cache player profileResult
                     if (profileResult != null) {
                         GameProfile gameProfile = profileResult.profile();
                         // CraftBukkit start - fire PlayerPreLoginEvent
@@ -350,6 +379,20 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
         // Paper end - Cache authenticator threads
     }
 
+    // Leaf start - Cache player profileResult
+    private static boolean isInvalidSession(@org.jetbrains.annotations.Nullable InetAddress currAddress, @org.jetbrains.annotations.Nullable InetAddress lastAddress) {
+        // Invalid address or non-public IP address
+        if (currAddress == null ||
+            currAddress.isAnyLocalAddress() ||
+            currAddress.isLinkLocalAddress() ||
+            currAddress.isLoopbackAddress() ||
+            currAddress.isSiteLocalAddress()) {
+            return true;
+        }
+        return !currAddress.equals(lastAddress);
+    }
+    // Leaf end - Cache player profileResult
+
     // CraftBukkit start
     private GameProfile callPlayerPreLoginEvents(GameProfile gameprofile) throws Exception { // Paper - Add more fields to AsyncPlayerPreLoginEvent
         // Paper start - Add Velocity IP Forwarding Support