Add TabCompleteEvent

api/src/main/java/net/md_5/bungee/api/event/TabCompleteEvent.java

@@ -0,0 +1,39 @@
+package net.md_5.bungee.api.event;
+
+import java.util.List;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import net.md_5.bungee.api.connection.Connection;
+import net.md_5.bungee.api.plugin.Cancellable;
+
+/**
+ * Event called when a player uses tab completion.
+ */
+@Data
+@ToString(callSuper = true)
+@EqualsAndHashCode(callSuper = true)
+public class TabCompleteEvent extends TargetedEvent implements Cancellable
+{
+
+    /**
+     * Cancelled state.
+     */
+    private boolean cancelled;
+    /**
+     * The message the player has already entered.
+     */
+    private final String cursor;
+    /**
+     * The suggestions that will be sent to the client. This list is mutable. If
+     * this list is empty, the request will be forwarded to the server.
+     */
+    private final List<String> suggestions;
+
+    public TabCompleteEvent(Connection sender, Connection receiver, String cursor, List<String> suggestions)
+    {
+        super( sender, receiver );
+        this.cursor = cursor;
+        this.suggestions = suggestions;
+    }
+}

proxy/src/main/java/net/md_5/bungee/connection/UpstreamBridge.java

@@ -9,6 +9,7 @@ import net.md_5.bungee.api.ProxyServer;
 import net.md_5.bungee.api.event.ChatEvent;
 import net.md_5.bungee.api.event.PlayerDisconnectEvent;
 import net.md_5.bungee.api.event.PluginMessageEvent;
+import net.md_5.bungee.api.event.TabCompleteEvent;
 import net.md_5.bungee.netty.ChannelWrapper;
 import net.md_5.bungee.netty.PacketHandler;
 import net.md_5.bungee.protocol.PacketWrapper;
@@ -99,16 +100,26 @@ public class UpstreamBridge extends PacketHandler
     @Override
     public void handle(TabCompleteRequest tabComplete) throws Exception
     {
+        List<String> suggestions = new ArrayList<>();
+
         if ( tabComplete.getCursor().startsWith( "/" ) )
         {
-            List<String> results = new ArrayList<>();
+            bungee.getPluginManager().dispatchCommand( con, tabComplete.getCursor().substring( 1 ), suggestions );
-            bungee.getPluginManager().dispatchCommand( con, tabComplete.getCursor().substring( 1 ), results );
+        }
 
+        TabCompleteEvent tabCompleteEvent = new TabCompleteEvent( con, con.getServer(), tabComplete.getCursor(), suggestions );
+        bungee.getPluginManager().callEvent( tabCompleteEvent );
+
+        List<String> results = tabCompleteEvent.getSuggestions();
         if ( !results.isEmpty() )
         {
             con.unsafe().sendPacket( new TabCompleteResponse( results.toArray( new String[ results.size() ] ) ) );
             throw CancelSendSignal.INSTANCE;
         }
+
+        if ( tabCompleteEvent.isCancelled() )
+        {
+            throw CancelSendSignal.INSTANCE;
         }
     }