From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Corey Shupe <coreyshupe101@gmail.com>
Date: Wed, 11 Jan 2023 16:40:39 -0500
Subject: [PATCH] Add Listing API for Player


diff --git a/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java b/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
index 32e3f347e2e025e2675e9410116386e472bd6a79..929483116d05a803d317ece7a44861af8bd36665 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ClientboundPlayerInfoUpdatePacket.java
@@ -29,12 +29,46 @@ public class ClientboundPlayerInfoUpdatePacket implements Packet<ClientGamePacke
         this.actions = EnumSet.of(action);
         this.entries = List.of(new ClientboundPlayerInfoUpdatePacket.Entry(player));
     }
+    // Paper start
+    public ClientboundPlayerInfoUpdatePacket(EnumSet<ClientboundPlayerInfoUpdatePacket.Action> actions, List<ClientboundPlayerInfoUpdatePacket.Entry> entries) {
+        this.actions = actions;
+        this.entries = entries;
+    }
+
+    public ClientboundPlayerInfoUpdatePacket(EnumSet<ClientboundPlayerInfoUpdatePacket.Action> actions, ClientboundPlayerInfoUpdatePacket.Entry entry) {
+        this.actions = actions;
+        this.entries = List.of(entry);
+    }
+    // Paper end
 
     public static ClientboundPlayerInfoUpdatePacket createPlayerInitializing(Collection<ServerPlayer> players) {
         EnumSet<ClientboundPlayerInfoUpdatePacket.Action> enumSet = EnumSet.of(ClientboundPlayerInfoUpdatePacket.Action.ADD_PLAYER, ClientboundPlayerInfoUpdatePacket.Action.INITIALIZE_CHAT, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_GAME_MODE, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_LISTED, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_LATENCY, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_DISPLAY_NAME);
         return new ClientboundPlayerInfoUpdatePacket(enumSet, players);
     }
 
+    // Paper start
+    public static ClientboundPlayerInfoUpdatePacket createPlayerInitializing(Collection<ServerPlayer> players, ServerPlayer forPlayer) {
+        final EnumSet<ClientboundPlayerInfoUpdatePacket.Action> enumSet = EnumSet.of(ClientboundPlayerInfoUpdatePacket.Action.ADD_PLAYER, ClientboundPlayerInfoUpdatePacket.Action.INITIALIZE_CHAT, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_GAME_MODE, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_LISTED, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_LATENCY, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_DISPLAY_NAME);
+        final List<ClientboundPlayerInfoUpdatePacket.Entry> entries = new java.util.ArrayList<>(players.size());
+        final org.bukkit.craftbukkit.entity.CraftPlayer bukkitEntity = forPlayer.getBukkitEntity();
+        for (final ServerPlayer player : players) {
+            entries.add(new ClientboundPlayerInfoUpdatePacket.Entry(player, bukkitEntity.isListed(player.getBukkitEntity())));
+        }
+        return new ClientboundPlayerInfoUpdatePacket(enumSet, entries);
+    }
+
+    public static ClientboundPlayerInfoUpdatePacket createSinglePlayerInitializing(ServerPlayer player, boolean listed) {
+        final EnumSet<ClientboundPlayerInfoUpdatePacket.Action> enumSet = EnumSet.of(ClientboundPlayerInfoUpdatePacket.Action.ADD_PLAYER, ClientboundPlayerInfoUpdatePacket.Action.INITIALIZE_CHAT, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_GAME_MODE, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_LISTED, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_LATENCY, ClientboundPlayerInfoUpdatePacket.Action.UPDATE_DISPLAY_NAME);
+        final List<ClientboundPlayerInfoUpdatePacket.Entry> entries = List.of(new Entry(player, listed));
+        return new ClientboundPlayerInfoUpdatePacket(enumSet, entries);
+    }
+
+    public static ClientboundPlayerInfoUpdatePacket updateListed(UUID playerInfoId, boolean listed) {
+        EnumSet<ClientboundPlayerInfoUpdatePacket.Action> enumSet = EnumSet.of(ClientboundPlayerInfoUpdatePacket.Action.UPDATE_LISTED);
+        return new ClientboundPlayerInfoUpdatePacket(enumSet, new ClientboundPlayerInfoUpdatePacket.Entry(playerInfoId, listed));
+    }
+    // Paper end
+
     public ClientboundPlayerInfoUpdatePacket(FriendlyByteBuf buf) {
         this.actions = buf.readEnumSet(ClientboundPlayerInfoUpdatePacket.Action.class);
         this.entries = buf.readList((buf2) -> {
@@ -144,8 +178,18 @@ public class ClientboundPlayerInfoUpdatePacket implements Packet<ClientGamePacke
 
     public static record Entry(UUID profileId, @Nullable GameProfile profile, boolean listed, int latency, GameType gameMode, @Nullable Component displayName, @Nullable RemoteChatSession.Data chatSession) {
         Entry(ServerPlayer player) {
-            this(player.getUUID(), player.getGameProfile(), true, player.connection.latency(), player.gameMode.getGameModeForPlayer(), player.getTabListDisplayName(), Optionull.map(player.getChatSession(), RemoteChatSession::asData));
+            // Paper start - add listed
+            this(player, true);
+        }
+        Entry(ServerPlayer player, boolean listed) {
+            this(player.getUUID(), player.getGameProfile(), listed, player.connection.latency(), player.gameMode.getGameModeForPlayer(), player.getTabListDisplayName(), Optionull.map(player.getChatSession(), RemoteChatSession::asData));
+            // Paper end - add listed
+        }
+        // Paper start
+        Entry(UUID profileId, boolean listed) {
+            this(profileId, null, listed, 0, GameType.DEFAULT_MODE, null, null);
         }
+        // Paper end
     }
 
     static class EntryBuilder {
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 3a70b7e1319c3ecab9eb720f8a1a34c0efe21a4b..33abcf12b4426572b74ca4c813e4392c823494bc 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -358,14 +358,22 @@ public abstract class PlayerList {
         // CraftBukkit end
 
         // CraftBukkit start - sendAll above replaced with this loop
-        ClientboundPlayerInfoUpdatePacket packet = ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(player));
+        ClientboundPlayerInfoUpdatePacket packet = ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(player)); // Paper
 
         final List<ServerPlayer> onlinePlayers = Lists.newArrayListWithExpectedSize(this.players.size() - 1); // Paper - use single player info update packet
         for (int i = 0; i < this.players.size(); ++i) {
             ServerPlayer entityplayer1 = (ServerPlayer) this.players.get(i);
 
             if (entityplayer1.getBukkitEntity().canSee(bukkitPlayer)) {
+                // Paper start
+                if (entityplayer1.getBukkitEntity().isListed(bukkitPlayer)) {
+                // Paper end
                 entityplayer1.connection.send(packet);
+                // Paper start
+                } else {
+                    entityplayer1.connection.send(ClientboundPlayerInfoUpdatePacket.createSinglePlayerInitializing(player, false));
+                }
+                // Paper end
             }
 
             if (entityplayer1 == player || !bukkitPlayer.canSee(entityplayer1.getBukkitEntity())) { // Paper - don't include joining player
@@ -376,7 +384,7 @@ public abstract class PlayerList {
         }
         // Paper start - use single player info update packet
         if (!onlinePlayers.isEmpty()) {
-            player.connection.send(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(onlinePlayers));
+            player.connection.send(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(onlinePlayers, player));
         }
         // Paper end
         player.sentListPacket = true;
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 2e0863cf1756c0b76e5637777f15f27e2c94fe6b..97ef38f744908a09e4d24c445a5cc39db0e6ee7e 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -184,6 +184,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     private final ConversationTracker conversationTracker = new ConversationTracker();
     private final Set<String> channels = new HashSet<String>();
     private final Map<UUID, Set<WeakReference<Plugin>>> invertedVisibilityEntities = new HashMap<>();
+    private final Set<UUID> unlistedEntities = new HashSet<>(); // Paper
     private static final WeakHashMap<Plugin, WeakReference<Plugin>> pluginWeakReferences = new WeakHashMap<>();
     private int hash = 0;
     private double health = 20;
@@ -1965,7 +1966,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
                 otherPlayer.setUUID(uuidOverride);
             }
             // Paper end
-            this.getHandle().connection.send(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(otherPlayer)));
+            this.getHandle().connection.send(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(otherPlayer), this.getHandle())); // Paper
             if (original != null) otherPlayer.setUUID(original); // Paper - uuid override
         }
 
@@ -2074,6 +2075,43 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
         return (entity != null) ? this.canSee(entity) : false; // If we can't find it, we can't see it
     }
 
+    // Paper start
+    @Override
+    public boolean isListed(Player other) {
+        return !this.unlistedEntities.contains(other.getUniqueId());
+    }
+
+    @Override
+    public boolean unlistPlayer(@NotNull Player other) {
+        Preconditions.checkNotNull(other, "hidden entity cannot be null");
+        if (this.getHandle().connection == null) return false;
+        if (this.equals(other)) return false;
+        if (!this.canSee(other)) return false;
+
+        if (unlistedEntities.add(other.getUniqueId())) {
+            this.getHandle().connection.send(ClientboundPlayerInfoUpdatePacket.updateListed(other.getUniqueId(), false));
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public boolean listPlayer(@NotNull Player other) {
+        Preconditions.checkNotNull(other, "hidden entity cannot be null");
+        if (this.getHandle().connection == null) return false;
+        if (this.equals(other)) return false;
+        if (!this.canSee(other)) throw new IllegalStateException("Player cannot see other player");
+
+        if (this.unlistedEntities.remove(other.getUniqueId())) {
+            this.getHandle().connection.send(ClientboundPlayerInfoUpdatePacket.updateListed(other.getUniqueId(), true));
+            return true;
+        } else {
+            return false;
+        }
+    }
+    // Paper end
+
     @Override
     public Map<String, Object> serialize() {
         Map<String, Object> result = new LinkedHashMap<String, Object>();