Limit length of chat string conversions

chat/src/main/java/net/md_5/bungee/api/chat/BaseComponent.java

@@ -4,6 +4,7 @@ import java.awt.Color;
 import java.util.ArrayList;
 import java.util.List;
 import lombok.AccessLevel;
+import lombok.Data;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.Setter;
@@ -677,11 +678,11 @@ public abstract class BaseComponent
     public String toPlainText()
     {
         StringBuilder builder = new StringBuilder();
-        toPlainText( builder );
+        toPlainText( new LimitedStringVisitor( builder, Short.MAX_VALUE ) );
         return builder.toString();
     }
 
-    void toPlainText(StringBuilder builder)
+    void toPlainText(StringVisitor builder)
     {
         if ( extra != null )
         {
@@ -701,11 +702,11 @@ public abstract class BaseComponent
     public String toLegacyText()
     {
         StringBuilder builder = new StringBuilder();
-        toLegacyText( builder );
+        toLegacyText( new LimitedStringVisitor( builder, Short.MAX_VALUE ) );
         return builder.toString();
     }
 
-    void toLegacyText(StringBuilder builder)
+    void toLegacyText(StringVisitor builder)
     {
         if ( extra != null )
         {
@@ -716,7 +717,7 @@ public abstract class BaseComponent
         }
     }
 
-    void addFormat(StringBuilder builder)
+    void addFormat(StringVisitor builder)
     {
         builder.append( getColor() );
         if ( isBold() )
@@ -740,4 +741,35 @@ public abstract class BaseComponent
             builder.append( ChatColor.MAGIC );
         }
     }
+
+    @FunctionalInterface
+    protected static interface StringVisitor
+    {
+
+        void append(String s);
+
+        default void append(Object obj)
+        {
+            append( String.valueOf( obj ) );
+        }
+    }
+
+    @Data
+    protected static class LimitedStringVisitor implements StringVisitor
+    {
+
+        private final StringBuilder builder;
+        private final int maxLength;
+
+        @Override
+        public void append(String s)
+        {
+            if ( builder.length() >= maxLength )
+            {
+                throw new IllegalArgumentException( "String exceeded maximum length " + maxLength );
+            }
+
+            builder.append( s );
+        }
+    }
 }

chat/src/main/java/net/md_5/bungee/api/chat/KeybindComponent.java

@@ -50,14 +50,14 @@ public final class KeybindComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         builder.append( getKeybind() );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         addFormat( builder );
         builder.append( getKeybind() );

chat/src/main/java/net/md_5/bungee/api/chat/ScoreComponent.java

@@ -85,14 +85,14 @@ public final class ScoreComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         builder.append( this.value );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         addFormat( builder );
         builder.append( this.value );

chat/src/main/java/net/md_5/bungee/api/chat/SelectorComponent.java

@@ -69,14 +69,14 @@ public final class SelectorComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         builder.append( this.selector );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         addFormat( builder );
         builder.append( this.selector );

chat/src/main/java/net/md_5/bungee/api/chat/TextComponent.java

@@ -280,14 +280,14 @@ public final class TextComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         builder.append( text );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         addFormat( builder );
         builder.append( text );

chat/src/main/java/net/md_5/bungee/api/chat/TranslatableComponent.java

@@ -156,20 +156,20 @@ public final class TranslatableComponent extends BaseComponent
     }
 
     @Override
-    protected void toPlainText(StringBuilder builder)
+    protected void toPlainText(StringVisitor builder)
     {
         convert( builder, false );
         super.toPlainText( builder );
     }
 
     @Override
-    protected void toLegacyText(StringBuilder builder)
+    protected void toLegacyText(StringVisitor builder)
     {
         convert( builder, true );
         super.toLegacyText( builder );
     }
 
-    private void convert(StringBuilder builder, boolean applyFormat)
+    private void convert(StringVisitor builder, boolean applyFormat)
     {
         String trans = TranslationRegistry.INSTANCE.translate( translate );