Implement adventure title APIs

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -51,6 +51,7 @@ import com.velocitypowered.proxy.protocol.util.PluginMessageUtil;
 import com.velocitypowered.proxy.server.VelocityRegisteredServer;
 import com.velocitypowered.proxy.tablist.VelocityTabList;
 import com.velocitypowered.proxy.tablist.VelocityTabListLegacy;
+import com.velocitypowered.proxy.util.DurationUtils;
 import com.velocitypowered.proxy.util.VelocityMessages;
 import com.velocitypowered.proxy.util.collect.CappedSet;
 import io.netty.buffer.ByteBufUtil;
@@ -279,6 +280,39 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
     }
   }
 
+  @Override
+  public void showTitle(net.kyori.adventure.title.@NonNull Title title) {
+    Gson gson = VelocityServer.getGsonInstance(this.getProtocolVersion());
+
+    TitlePacket titlePkt = new TitlePacket();
+    titlePkt.setAction(TitlePacket.SET_TITLE);
+    titlePkt.setComponent(gson.toJson(title.title()));
+    connection.delayedWrite(titlePkt);
+
+    TitlePacket subtitlePkt = new TitlePacket();
+    subtitlePkt.setAction(TitlePacket.SET_SUBTITLE);
+    subtitlePkt.setComponent(gson.toJson(title.subtitle()));
+    connection.delayedWrite(titlePkt);
+
+    TitlePacket timesPkt = TitlePacket.timesForProtocolVersion(this.getProtocolVersion());
+    timesPkt.setFadeIn((int) DurationUtils.convertDurationToTicks(title.fadeInTime()));
+    timesPkt.setStay((int) DurationUtils.convertDurationToTicks(title.stayTime()));
+    timesPkt.setFadeOut((int) DurationUtils.convertDurationToTicks(title.fadeOutTime()));
+    connection.delayedWrite(timesPkt);
+
+    connection.flush();
+  }
+
+  @Override
+  public void clearTitle() {
+    connection.write(TitlePacket.hideForProtocolVersion(this.getProtocolVersion()));
+  }
+
+  @Override
+  public void resetTitle() {
+    connection.write(TitlePacket.resetForProtocolVersion(this.getProtocolVersion()));
+  }
+
   @Override
   public ConnectionRequestBuilder createConnectionRequest(RegisteredServer server) {
     return new ConnectionRequestBuilderImpl(server);

proxy/src/main/java/com/velocitypowered/proxy/connection/client/StatusSessionHandler.java

@@ -25,7 +25,6 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
-import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 

proxy/src/main/java/com/velocitypowered/proxy/util/DurationUtils.java

@@ -0,0 +1,24 @@
+package com.velocitypowered.proxy.util;
+
+import java.time.Duration;
+
+/**
+ * Provides utility functions for working with durations.
+ */
+public class DurationUtils {
+  private static final long ONE_TICK_IN_MILLISECONDS = 50;
+
+  private DurationUtils() {
+    throw new AssertionError("Instances of this class should not be created.");
+  }
+
+  /**
+   * Converts the given duration to Minecraft ticks.
+   *
+   * @param duration the duration to convert into Minecraft ticks
+   * @return the duration represented as the number of Minecraft ticks
+   */
+  public static long convertDurationToTicks(Duration duration) {
+    return duration.toMillis() / ONE_TICK_IN_MILLISECONDS;
+  }
+}