PaperMC/paper-server/patches/sources/net/minecraft/network/chat/SignedMessageChain.java.patch

--- a/net/minecraft/network/chat/SignedMessageChain.java
+++ b/net/minecraft/network/chat/SignedMessageChain.java
@@ -40,14 +_,14 @@
                 if (signature == null) {
                     throw new SignedMessageChain.DecodeException(SignedMessageChain.DecodeException.MISSING_PROFILE_KEY);
                 } else if (publicKey.data().hasExpired()) {
-                    throw new SignedMessageChain.DecodeException(SignedMessageChain.DecodeException.EXPIRED_PROFILE_KEY);
+                    throw new SignedMessageChain.DecodeException(SignedMessageChain.DecodeException.EXPIRED_PROFILE_KEY,  org.bukkit.event.player.PlayerKickEvent.Cause.EXPIRED_PROFILE_PUBLIC_KEY); // Paper - kick event causes
                 } else {
                     SignedMessageLink signedMessageLink = SignedMessageChain.this.nextLink;
                     if (signedMessageLink == null) {
                         throw new SignedMessageChain.DecodeException(SignedMessageChain.DecodeException.CHAIN_BROKEN);
                     } else if (body.timeStamp().isBefore(SignedMessageChain.this.lastTimeStamp)) {
                         this.setChainBroken();
-                        throw new SignedMessageChain.DecodeException(SignedMessageChain.DecodeException.OUT_OF_ORDER_CHAT);
+                        throw new SignedMessageChain.DecodeException(SignedMessageChain.DecodeException.OUT_OF_ORDER_CHAT, org.bukkit.event.player.PlayerKickEvent.Cause.OUT_OF_ORDER_CHAT); // Paper - kick event causes
                     } else {
                         SignedMessageChain.this.lastTimeStamp = body.timeStamp();
                         PlayerChatMessage playerChatMessage = new PlayerChatMessage(signedMessageLink, signature, body, null, FilterMask.PASS_THROUGH);
@@ -80,8 +_,15 @@
         static final Component INVALID_SIGNATURE = Component.translatable("chat.disabled.invalid_signature");
         static final Component OUT_OF_ORDER_CHAT = Component.translatable("chat.disabled.out_of_order_chat");
 
-        public DecodeException(Component component) {
-            super(component);
+        // Paper start
+        public final org.bukkit.event.player.PlayerKickEvent.Cause kickCause;
+        public DecodeException(Component message, org.bukkit.event.player.PlayerKickEvent.Cause event) {
+            super(message);
+            this.kickCause = event;
+        }
+        // Paper end
+        public DecodeException(Component message) {
+            this(message, org.bukkit.event.player.PlayerKickEvent.Cause.UNKNOWN); // Paper
         }
     }