Waterfall/BungeeCord-Patches/0023-Validate-that-chat-messages-are-non-blank.patch

From eb08195f059ee1135c1eee1bc86089a83b6d2f95 Mon Sep 17 00:00:00 2001
From: Tux <write@imaginarycode.com>
Date: Tue, 25 Oct 2016 12:34:41 -0400
Subject: [PATCH] Validate that chat messages are non-blank


diff --git a/proxy/src/main/java/net/md_5/bungee/connection/UpstreamBridge.java b/proxy/src/main/java/net/md_5/bungee/connection/UpstreamBridge.java
index 30623743..c769976f 100644
--- a/proxy/src/main/java/net/md_5/bungee/connection/UpstreamBridge.java
+++ b/proxy/src/main/java/net/md_5/bungee/connection/UpstreamBridge.java
@@ -147,6 +147,7 @@ public class UpstreamBridge extends PacketHandler
     @Override
     public void handle(Chat chat) throws Exception
     {
+        boolean empty = true;
         for ( int index = 0, length = chat.getMessage().length(); index < length; index++ )
         {
             char c = chat.getMessage().charAt( index );
@@ -154,8 +155,11 @@ public class UpstreamBridge extends PacketHandler
             {
                 con.disconnect( bungee.getTranslation( "illegal_chat_characters", Util.unicode( c ) ) );
                 throw CancelSendSignal.INSTANCE;
+            } else if (empty && !Character.isWhitespace(c)) {
+                empty = false;
             }
         }
+        Preconditions.checkArgument(!empty, "Chat message is empty");
 
         ChatEvent chatEvent = new ChatEvent( con, con.getServer(), chat.getMessage() );
         if ( !bungee.getPluginManager().callEvent( chatEvent ).isCancelled() )
-- 
2.30.1 (Apple Git-130)