Paper/patches/server/0298-Add-PlayerConnectionCloseEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 7 Oct 2018 12:05:28 -0700
Subject: [PATCH] Add PlayerConnectionCloseEvent

This event is invoked when a player has disconnected. It is guaranteed that,
if the server is in online-mode, that the provided uuid and username have been
validated.

The event is invoked for players who have not yet logged into the world, whereas
PlayerQuitEvent is only invoked on players who have logged into the world.

The event is invoked for players who have already logged into the world,
although whether or not the player exists in the world at the time of
firing is undefined. (That is, whether the plugin can retrieve a Player object
using the event parameters is undefined). However, it is guaranteed that this
event is invoked AFTER PlayerQuitEvent, if the player has already logged into
the world.

This event is guaranteed to never fire unless AsyncPlayerPreLoginEvent has
been called beforehand, and this event may not be called in parallel with
AsyncPlayerPreLoginEvent for the same connection.

Cancelling the AsyncPlayerPreLoginEvent guarantees the corresponding
PlayerConnectionCloseEvent is never called.

The event may be invoked asynchronously or synchronously. As it stands,
it is never invoked asynchronously. However, plugins should check
Event#isAsynchronous to be future-proof.

On purpose, the deprecated PlayerPreLoginEvent event is left out of the
API spec for this event. Plugins should not be using that event, and
how PlayerPreLoginEvent interacts with PlayerConnectionCloseEvent
is undefined.

diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
index 8bbf13a7aea1142b3154a1c76837a98aa5ed431d..9f0537799a3cae43fb120056b8fe805a4883cc4d 100644
--- a/src/main/java/net/minecraft/network/Connection.java
+++ b/src/main/java/net/minecraft/network/Connection.java
@@ -418,6 +418,26 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
                     this.getPacketListener().onDisconnect(new TranslatableComponent("multiplayer.disconnect.generic"));
                 }
                 this.queue.clear(); // Free up packet queue.
+                // Paper start - Add PlayerConnectionCloseEvent
+                final PacketListener packetListener = this.getPacketListener();
+                if (packetListener instanceof ServerGamePacketListenerImpl) {
+                    /* Player was logged in */
+                    final ServerGamePacketListenerImpl playerConnection = (ServerGamePacketListenerImpl) packetListener;
+                    new com.destroystokyo.paper.event.player.PlayerConnectionCloseEvent(playerConnection.player.getUUID(),
+                        playerConnection.player.getScoreboardName(), ((java.net.InetSocketAddress)address).getAddress(), false).callEvent();
+                } else if (packetListener instanceof ServerLoginPacketListenerImpl) {
+                    /* Player is login stage */
+                    final ServerLoginPacketListenerImpl loginListener = (ServerLoginPacketListenerImpl) packetListener;
+                    switch (loginListener.getLoginState()) {
+                        case READY_TO_ACCEPT:
+                        case DELAY_ACCEPT:
+                        case ACCEPTED:
+                            final com.mojang.authlib.GameProfile profile = loginListener.getGameProfile(); /* Should be non-null at this stage */
+                            new com.destroystokyo.paper.event.player.PlayerConnectionCloseEvent(profile.getId(), profile.getName(),
+                                ((java.net.InetSocketAddress)address).getAddress(), false).callEvent();
+                    }
+                }
+                // Paper end
             }
 
         }
diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index a196ab2510a1c302ef1c946400c1a7c07619994a..46432534fddbbf78e3bf46385b9638d2f92c951f 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -56,10 +56,10 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener
     private final byte[] nonce = new byte[4];
     final MinecraftServer server;
     public final Connection connection;
-    ServerLoginPacketListenerImpl.State state;
+    ServerLoginPacketListenerImpl.State state; public final ServerLoginPacketListenerImpl.State getLoginState() { return this.state; }; // Paper - OBFHELPER
     private int tick;
     @Nullable
-    GameProfile gameProfile;
+    GameProfile gameProfile; private void setGameProfile(final GameProfile profile) { this.gameProfile = profile; } public GameProfile getGameProfile() { return this.gameProfile; } // Paper - OBFHELPER
     private final String serverId;
     @Nullable
     private ServerPlayer delayedAcceptPlayer;
@@ -441,7 +441,7 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener
         return new GameProfile(uuid, profile.getName());
     }
 
-    private static enum State {
+    public static enum State { // Paper - make public
 
         HELLO, KEY, AUTHENTICATING, NEGOTIATING, READY_TO_ACCEPT, DELAY_ACCEPT, ACCEPTED;