Port Anti-Xray to 1.18 (#6947)

patches/server/0578-Add-sendOpLevel-API.patch

@@ -0,0 +1,51 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Mariell Hoversholm <proximyst@proximyst.com>
+Date: Tue, 29 Dec 2020 15:03:03 +0100
+Subject: [PATCH] Add sendOpLevel API
+
+
+diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
+index 04e314761b09f7c13c94cb83a9a7da629fb16641..52f8e91462b9f605aa529bc3ec4d55c9a006e472 100644
+--- a/src/main/java/net/minecraft/server/players/PlayerList.java
++++ b/src/main/java/net/minecraft/server/players/PlayerList.java
+@@ -1119,6 +1119,11 @@ public abstract class PlayerList {
+     }
+ 
+     private void sendPlayerPermissionLevel(ServerPlayer player, int permissionLevel) {
++        // Paper start - add recalculatePermissions parameter
++        this.sendPlayerPermissionLevel(player, permissionLevel, true);
++    }
++    public void sendPlayerPermissionLevel(ServerPlayer player, int permissionLevel, boolean recalculatePermissions) {
++        // Paper end
+         if (player.connection != null) {
+             byte b0;
+ 
+@@ -1133,8 +1138,10 @@ public abstract class PlayerList {
+             player.connection.send(new ClientboundEntityEventPacket(player, b0));
+         }
+ 
++        if (recalculatePermissions) { // Paper
+         player.getBukkitEntity().recalculatePermissions(); // CraftBukkit
+         this.server.getCommands().sendCommands(player);
++        } // Paper
+     }
+ 
+     // Paper start
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+index 9499062a2d8d69764c314a791622c967641e3543..a68973595b9b08a636f5aeb11608b5b9499d8e16 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+@@ -577,6 +577,13 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
+             ? (org.bukkit.entity.Firework) entity.getBukkitEntity()
+             : null;
+     }
++
++    @Override
++    public void sendOpLevel(byte level) {
++        Preconditions.checkArgument(level >= 0 && level <= 4, "Level must be within [0, 4]");
++
++        this.getHandle().getServer().getPlayerList().sendPlayerPermissionLevel(this.getHandle(), level, false);
++    }
+     // Paper end
+ 
+     @Override