Fix exploit that allowed colored signs to be created (#1098)

Spigot-Server-Patches/0291-Fix-exploit-that-allowed-colored-signs-to-be-created.patch

@@ -0,0 +1,22 @@
+From 53c121f673de01e7340d0bcfc5a1e72271647b6e Mon Sep 17 00:00:00 2001
+From: 0x22 <0x22@futureclient.net>
+Date: Thu, 26 Apr 2018 04:41:11 -0400
+Subject: [PATCH] Fix exploit that allowed colored signs to be created
+
+
+diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
+index e6d0c636..a5faa6a0 100644
+--- a/src/main/java/net/minecraft/server/PlayerConnection.java
++++ b/src/main/java/net/minecraft/server/PlayerConnection.java
+@@ -2220,7 +2220,7 @@ public class PlayerConnection implements PacketListenerPlayIn, ITickable {
+             String[] lines = new String[4];
+ 
+             for (int i = 0; i < astring.length; ++i) {
+-                lines[i] = EnumChatFormat.a(new ChatComponentText(EnumChatFormat.a(astring[i])).toPlainText());
++                lines[i] = SharedConstants.a(astring[i]); //Paper - Replaced with anvil color stripping method to stop exploits that allow colored signs to be created.
+             }
+             SignChangeEvent event = new SignChangeEvent((org.bukkit.craftbukkit.block.CraftBlock) player.getWorld().getBlockAt(x, y, z), this.server.getPlayer(this.player), lines);
+             this.server.getPluginManager().callEvent(event);
+-- 
+2.13.3.windows.1
+