PaperMC/patches/server/0918-Prevent-causing-expired-keys-from-impacting-new-join.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Mon, 3 Apr 2023 08:55:52 +0100
Subject: [PATCH] Prevent causing expired keys from impacting new joins


diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
index 0e54e8faa48751a651b953bec72543a94edf74bc..aa1c6de4d6cb7bbca33d25895c54707d220ab62a 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
@@ -96,7 +96,13 @@ public class ClientboundPlayerInfoUpdatePacket implements Packet<ClientGamePacke
         INITIALIZE_CHAT((serialized, buf) -> {
             serialized.chatSession = buf.readNullable(RemoteChatSession.Data::read);
         }, (buf, entry) -> {
-            buf.writeNullable(entry.chatSession, RemoteChatSession.Data::write);
+            // Paper start
+            RemoteChatSession.Data chatSession = entry.chatSession;
+            if (chatSession != null && chatSession.profilePublicKey().hasExpired()) {
+                chatSession = null;
+            }
+            buf.writeNullable(chatSession, RemoteChatSession.Data::write);
+            // Paper end
         }),
         UPDATE_GAME_MODE((serialized, buf) -> {
             serialized.gameMode = GameType.byId(buf.readVarInt());
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index d48ea4f9d2968a4d8af426058d01cc17a090a1fa..aa1c1418559265deaf755d65c9d57e9592ee0a6e 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -287,6 +287,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
     private int knownMovePacketCount;
     @Nullable
     private RemoteChatSession chatSession;
+    private boolean hasLoggedExpiry = false; // Paper
     private SignedMessageChain.Decoder signedMessageDecoder;
     private final LastSeenMessagesValidator lastSeenMessages = new LastSeenMessagesValidator(20);
     private final MessageSignatureCache messageSignatureCache = MessageSignatureCache.createDefault();
@@ -395,6 +396,13 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
             this.disconnect(Component.translatable("multiplayer.disconnect.idling"), org.bukkit.event.player.PlayerKickEvent.Cause.IDLING); // Paper - kick event cause
         }
 
+        // Paper start
+        if (!hasLoggedExpiry && this.chatSession != null && this.chatSession.profilePublicKey().data().hasExpired()) {
+            LOGGER.info("Player profile key for {} has expired!", this.player.getName().getString());
+            hasLoggedExpiry = true;
+        }
+        // Paper end
+
     }
 
     public void resetPosition() {
@@ -3420,6 +3428,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
 
     private void resetPlayerChatState(RemoteChatSession session) {
         this.chatSession = session;
+        this.hasLoggedExpiry = false; // Paper
         this.signedMessageDecoder = session.createMessageDecoder(this.player.getUUID());
         this.chatMessageChain.append(() -> {
             this.player.setChatSession(session);