Backport player ping api

src/main/java/catserver/api/annotation/Backported.java

@@ -0,0 +1,13 @@
+package catserver.api.annotation;
+
+import java.lang.annotation.*;
+
+/**
+ * Indicates that the annotated api method is backported from a newer version of Minecraft.
+ */
+@Documented
+@Retention(RetentionPolicy.CLASS)
+@Target({ElementType.METHOD, ElementType.TYPE})
+public @interface Backported {
+    String from() default "";
+}

src/main/java/com/destroystokyo/paper/event/server/ServerTickEndEvent.java

@@ -1,11 +1,13 @@
 package com.destroystokyo.paper.event.server;
 
+import catserver.api.annotation.Backported;
 import org.bukkit.event.Event;
 import org.bukkit.event.HandlerList;
 
 /**
  * Called when the server has finished ticking the main loop
  */
+@Backported(from = "1.13.2")
 public class ServerTickEndEvent extends Event {
 
     private static final HandlerList HANDLER_LIST = new HandlerList();

src/main/java/com/destroystokyo/paper/event/server/ServerTickStartEvent.java

@@ -1,8 +1,10 @@
 package com.destroystokyo.paper.event.server;
 
+import catserver.api.annotation.Backported;
 import org.bukkit.event.Event;
 import org.bukkit.event.HandlerList;
 
+@Backported(from = "1.13.2")
 public class ServerTickStartEvent extends Event {
 
     private static final HandlerList HANDLER_LIST = new HandlerList();

src/main/java/org/bukkit/craftbukkit/v1_12_R1/entity/CraftPlayer.java

@@ -1543,6 +1543,13 @@ public org.bukkit.advancement.AdvancementProgress getAdvancementProgress(org.buk
         return new CraftAdvancementProgress(craft, data, progress);
     }
 
+    // CatRoom start - Backport APIs
+    @Override
+    public int getPing() {
+        return this.getHandle().ping;
+    }
+    // CatRoom end - Backport APIs
+
     @Override
     public String getLocale() {
         return getHandle().language;

src/main/java/org/bukkit/entity/Player.java

@@ -1427,6 +1427,24 @@ public interface Player extends HumanEntity, Conversable, CommandSender, Offline
      */
     public AdvancementProgress getAdvancementProgress(Advancement advancement);
 
+    // CatRoom start - Backport APIs
+    /**
+     * Gets the player's estimated ping in milliseconds.
+     *
+     * In Vanilla this value represents a weighted average of the response time
+     * to application layer ping packets sent. This value does not represent the
+     * network round trip time and as such may have less granularity and be
+     * impacted by other sources. For these reasons it <b>should not</b> be used
+     * for anti-cheat purposes. Its recommended use is only as a
+     * <b>qualitative</b> indicator of connection quality (Vanilla uses it for
+     * this purpose in the tab list).
+     *
+     * @return player ping
+     */
+    @catserver.api.annotation.Backported(from = "1.17")
+    public int getPing();
+    // CatRoom end - Backport APIs
+
     /**
      * Gets the player's current locale.
      *