Paper/patches/server-remapped/0198-Implement-extended-PaperServerListPingEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Minecrell <minecrell@minecrell.net>
Date: Wed, 11 Oct 2017 15:56:26 +0200
Subject: [PATCH] Implement extended PaperServerListPingEvent


diff --git a/src/main/java/com/destroystokyo/paper/network/PaperServerListPingEventImpl.java b/src/main/java/com/destroystokyo/paper/network/PaperServerListPingEventImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..4ecd0c5bbea55f68549c85aa27e80e2c7e6265d4
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/network/PaperServerListPingEventImpl.java
@@ -0,0 +1,31 @@
+package com.destroystokyo.paper.network;
+
+import com.destroystokyo.paper.event.server.PaperServerListPingEvent;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerPlayer;
+import org.bukkit.entity.Player;
+import org.bukkit.util.CachedServerIcon;
+
+import javax.annotation.Nullable;
+
+class PaperServerListPingEventImpl extends PaperServerListPingEvent {
+
+    private final MinecraftServer server;
+
+    PaperServerListPingEventImpl(MinecraftServer server, StatusClient client, int protocolVersion, @Nullable CachedServerIcon icon) {
+        super(client, server.getMotd(), server.getPlayerCount(), server.getMaxPlayers(),
+                server.getServerModName() + ' ' + server.getServerVersion(), protocolVersion, icon);
+        this.server = server;
+    }
+
+    @Override
+    protected final Object[] getOnlinePlayers() {
+        return this.server.getPlayerList().players.toArray();
+    }
+
+    @Override
+    protected final Player getBukkitPlayer(Object player) {
+        return ((ServerPlayer) player).getBukkitEntity();
+    }
+
+}
diff --git a/src/main/java/com/destroystokyo/paper/network/PaperStatusClient.java b/src/main/java/com/destroystokyo/paper/network/PaperStatusClient.java
new file mode 100644
index 0000000000000000000000000000000000000000..d926ad804355ee2fdc5910b2505e8671602acdab
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/network/PaperStatusClient.java
@@ -0,0 +1,11 @@
+package com.destroystokyo.paper.network;
+
+import net.minecraft.network.Connection;
+
+class PaperStatusClient extends PaperNetworkClient implements StatusClient {
+
+    PaperStatusClient(Connection networkManager) {
+        super(networkManager);
+    }
+
+}
diff --git a/src/main/java/com/destroystokyo/paper/network/StandardPaperServerListPingEventImpl.java b/src/main/java/com/destroystokyo/paper/network/StandardPaperServerListPingEventImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..4c2351b03b58511b80017b58ee9b20ab5193adc9
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/network/StandardPaperServerListPingEventImpl.java
@@ -0,0 +1,110 @@
+package com.destroystokyo.paper.network;
+
+import com.destroystokyo.paper.profile.CraftPlayerProfile;
+import com.destroystokyo.paper.profile.PlayerProfile;
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Strings;
+import com.mojang.authlib.GameProfile;
+import io.papermc.paper.adventure.AdventureComponent;
+import java.util.List;
+import java.util.UUID;
+import javax.annotation.Nonnull;
+import net.minecraft.network.Connection;
+import net.minecraft.network.protocol.status.ClientboundStatusResponsePacket;
+import net.minecraft.network.protocol.status.ServerStatus;
+import net.minecraft.server.MinecraftServer;
+
+public final class StandardPaperServerListPingEventImpl extends PaperServerListPingEventImpl {
+
+    private static final GameProfile[] EMPTY_PROFILES = new GameProfile[0];
+    private static final UUID FAKE_UUID = new UUID(0, 0);
+
+    private GameProfile[] originalSample;
+
+    private StandardPaperServerListPingEventImpl(MinecraftServer server, Connection networkManager, ServerStatus ping) {
+        super(server, new PaperStatusClient(networkManager), ping.getVersion() != null ? ping.getVersion().getProtocol() : -1, server.server.getServerIcon());
+        this.originalSample = ping.getPlayers() == null ? null : ping.getPlayers().getSample(); // GH-1473 - pre-tick race condition NPE
+    }
+
+    @Nonnull
+    @Override
+    public List<PlayerProfile> getPlayerSample() {
+        List<PlayerProfile> sample = super.getPlayerSample();
+
+        if (this.originalSample != null) {
+            for (GameProfile profile : this.originalSample) {
+                sample.add(CraftPlayerProfile.asBukkitCopy(profile));
+            }
+            this.originalSample = null;
+        }
+
+        return sample;
+    }
+
+    private GameProfile[] getPlayerSampleHandle() {
+        if (this.originalSample != null) {
+            return this.originalSample;
+        }
+
+        List<PlayerProfile> entries = super.getPlayerSample();
+        if (entries.isEmpty()) {
+            return EMPTY_PROFILES;
+        }
+
+        GameProfile[] profiles = new GameProfile[entries.size()];
+        for (int i = 0; i < profiles.length; i++) {
+            /*
+             * Avoid null UUIDs/names since that will make the response invalid
+             * on the client.
+             * Instead, fall back to a fake/empty UUID and an empty string as name.
+             * This can be used to create custom lines in the player list that do not
+             * refer to a specific player.
+             */
+
+            PlayerProfile profile = entries.get(i);
+            if (profile.getId() != null && profile.getName() != null) {
+                profiles[i] = CraftPlayerProfile.asAuthlib(profile);
+            } else {
+                profiles[i] = new GameProfile(MoreObjects.firstNonNull(profile.getId(), FAKE_UUID), Strings.nullToEmpty(profile.getName()));
+            }
+        }
+
+        return profiles;
+    }
+
+    @SuppressWarnings("deprecation")
+    public static void processRequest(MinecraftServer server, Connection networkManager) {
+        StandardPaperServerListPingEventImpl event = new StandardPaperServerListPingEventImpl(server, networkManager, server.getStatus());
+        server.server.getPluginManager().callEvent(event);
+
+        // Close connection immediately if event is cancelled
+        if (event.isCancelled()) {
+            networkManager.disconnect(null);
+            return;
+        }
+
+        // Setup response
+        ServerStatus ping = new ServerStatus();
+
+        // Description
+        ping.setDescription(new AdventureComponent(event.motd()));
+
+        // Players
+        if (!event.shouldHidePlayers()) {
+            ping.setPlayers(new ServerStatus.Players(event.getMaxPlayers(), event.getNumPlayers()));
+            ping.getPlayers().setSample(event.getPlayerSampleHandle());
+        }
+
+        // Version
+        ping.setVersion(new ServerStatus.Version(event.getVersion(), event.getProtocolVersion()));
+
+        // Favicon
+        if (event.getServerIcon() != null) {
+            ping.setFavicon(event.getServerIcon().getData());
+        }
+
+        // Send response
+        networkManager.send(new ClientboundStatusResponsePacket(ping));
+    }
+
+}
diff --git a/src/main/java/net/minecraft/network/protocol/status/ClientboundStatusResponsePacket.java b/src/main/java/net/minecraft/network/protocol/status/ClientboundStatusResponsePacket.java
index b985d238eadf857602636ba5e5c277d4b1992d35..5b2081f920304244df96de78b2c66cf8a49a5b85 100644
--- a/src/main/java/net/minecraft/network/protocol/status/ClientboundStatusResponsePacket.java
+++ b/src/main/java/net/minecraft/network/protocol/status/ClientboundStatusResponsePacket.java
@@ -2,6 +2,7 @@ package net.minecraft.network.protocol.status;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
+import io.papermc.paper.adventure.AdventureComponent; // Paper
 import java.io.IOException;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.network.chat.Component;
@@ -12,7 +13,9 @@ import net.minecraft.util.LowerCaseEnumTypeAdapterFactory;
 
 public class ClientboundStatusResponsePacket implements Packet<ClientStatusPacketListener> {
 
-    private static final Gson GSON = (new GsonBuilder()).registerTypeAdapter(ServerStatus.Version.class, new ServerStatus.Version.Serializer()).registerTypeAdapter(ServerStatus.Players.class, new ServerStatus.Players.Serializer()).registerTypeAdapter(ServerStatus.class, new ServerStatus.Serializer()).registerTypeHierarchyAdapter(Component.class, new Component.Serializer()).registerTypeHierarchyAdapter(Style.class, new Style.Serializer()).registerTypeAdapterFactory(new LowerCaseEnumTypeAdapterFactory()).create();
+    private static final Gson GSON = (new GsonBuilder()).registerTypeAdapter(ServerStatus.Version.class, new ServerStatus.Version.Serializer()).registerTypeAdapter(ServerStatus.Players.class, new ServerStatus.Players.Serializer()).registerTypeAdapter(ServerStatus.class, new ServerStatus.Serializer()).registerTypeHierarchyAdapter(Component.class, new Component.Serializer()).registerTypeHierarchyAdapter(Style.class, new Style.Serializer()).registerTypeAdapterFactory(new LowerCaseEnumTypeAdapterFactory())
+        .registerTypeAdapter(AdventureComponent.class, new AdventureComponent.Serializer())
+        .create();
     private ServerStatus status;
 
     public ClientboundStatusResponsePacket() {}
diff --git a/src/main/java/net/minecraft/network/protocol/status/ServerStatus.java b/src/main/java/net/minecraft/network/protocol/status/ServerStatus.java
index d6be3dd6cfed3f65325398fc33663cb251f87ac7..31d45cd635eae2ff406cb0441f2cd2aee833b945 100644
--- a/src/main/java/net/minecraft/network/protocol/status/ServerStatus.java
+++ b/src/main/java/net/minecraft/network/protocol/status/ServerStatus.java
@@ -31,6 +31,7 @@ public class ServerStatus {
         this.description = description;
     }
 
+    public Players getPlayers() { return getPlayers(); } // Paper - OBFHELPER
     public ServerStatus.Players getPlayers() {
         return this.players;
     }
@@ -162,10 +163,12 @@ public class ServerStatus {
             return this.numPlayers;
         }
 
+        public GameProfile[] getSample() { return getSample(); } // Paper - OBFHELPER
         public GameProfile[] getSample() {
             return this.sample;
         }
 
+        public void setSample(GameProfile[] sample) { setSample(sample); } // Paper - OBFHELPER
         public void setSample(GameProfile[] sample) {
             this.sample = sample;
         }
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 4b3341877629c7065496fb0f0b4d509f5a48db6d..d34da1eb172a7dcda564680afecf3dc145bf09f3 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -2,6 +2,9 @@ package net.minecraft.server;
 
 import com.google.common.base.Splitter;
 import com.google.common.collect.ImmutableList;
+import co.aikar.timings.Timings;
+import com.destroystokyo.paper.event.server.PaperServerListPingEvent;
+import com.google.common.base.Stopwatch;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
@@ -1238,7 +1241,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         if (i - this.lastServerStatus >= 5000000000L) {
             this.lastServerStatus = i;
             this.status.setPlayers(new ServerStatus.Players(this.getMaxPlayers(), this.getPlayerCount()));
-            GameProfile[] agameprofile = new GameProfile[Math.min(this.getPlayerCount(), 12)];
+            GameProfile[] agameprofile = new GameProfile[Math.min(this.getPlayerCount(), org.spigotmc.SpigotConfig.playerSample)]; // Paper
             int j = Mth.nextInt(this.random, 0, this.getPlayerCount() - agameprofile.length);
 
             for (int k = 0; k < agameprofile.length; ++k) {
diff --git a/src/main/java/net/minecraft/server/network/ServerStatusPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerStatusPacketListenerImpl.java
index 223df8d27c2ff1cbff634bca3dbde5cc24de7f98..f74e3cbdff8c2d83809f04f42717501d7b1a1ed2 100644
--- a/src/main/java/net/minecraft/server/network/ServerStatusPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerStatusPacketListenerImpl.java
@@ -1,7 +1,7 @@
 package net.minecraft.server.network;
 
 import net.minecraft.server.MinecraftServer;
-import net.minecraft.server.level.ServerPlayer;
+
 // CraftBukkit start
 import com.mojang.authlib.GameProfile;
 import java.net.InetSocketAddress;
@@ -11,8 +11,6 @@ import net.minecraft.network.Connection;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.chat.TranslatableComponent;
 import net.minecraft.network.protocol.status.ClientboundPongResponsePacket;
-import net.minecraft.network.protocol.status.ClientboundStatusResponsePacket;
-import net.minecraft.network.protocol.status.ServerStatus;
 import net.minecraft.network.protocol.status.ServerStatusPacketListener;
 import net.minecraft.network.protocol.status.ServerboundPingRequestPacket;
 import net.minecraft.network.protocol.status.ServerboundStatusRequestPacket;
@@ -47,15 +45,17 @@ public class ServerStatusPacketListenerImpl implements ServerStatusPacketListene
             this.connection.disconnect(ServerStatusPacketListenerImpl.DISCONNECT_REASON);
         } else {
             this.hasRequestedStatus = true;
+            // Paper start - Replace everything
+            /*
             // CraftBukkit start
             // this.networkManager.sendPacket(new PacketStatusOutServerInfo(this.minecraftServer.getServerPing()));
-            final Object[] players = server.getPlayerList().players.toArray();
+            final Object[] players = minecraftServer.getPlayerList().players.toArray();
             class ServerListPingEvent extends org.bukkit.event.server.ServerListPingEvent {
 
-                CraftIconCache icon = server.server.getServerIcon();
+                CraftIconCache icon = minecraftServer.server.getServerIcon();
 
                 ServerListPingEvent() {
-                    super(((InetSocketAddress) connection.getRemoteAddress()).getAddress(), server.server.motd(), server.getPlayerList().getMaxPlayers()); // Paper - Adventure
+                    super(((InetSocketAddress) networkManager.getSocketAddress()).getAddress(), minecraftServer.server.motd(), minecraftServer.getPlayerList().getMaxPlayers()); // Paper - Adventure
                 }
 
                 @Override
@@ -71,7 +71,7 @@ public class ServerStatusPacketListenerImpl implements ServerStatusPacketListene
                     return new Iterator<Player>() {
                         int i;
                         int ret = Integer.MIN_VALUE;
-                        ServerPlayer player;
+                        EntityPlayer player;
 
                         @Override
                         public boolean hasNext() {
@@ -80,7 +80,7 @@ public class ServerStatusPacketListenerImpl implements ServerStatusPacketListene
                             }
                             final Object[] currentPlayers = players;
                             for (int length = currentPlayers.length, i = this.i; i < length; i++) {
-                                final ServerPlayer player = (ServerPlayer) currentPlayers[i];
+                                final EntityPlayer player = (EntityPlayer) currentPlayers[i];
                                 if (player != null) {
                                     this.i = i + 1;
                                     this.player = player;
@@ -95,7 +95,7 @@ public class ServerStatusPacketListenerImpl implements ServerStatusPacketListene
                             if (!hasNext()) {
                                 throw new java.util.NoSuchElementException();
                             }
-                            final ServerPlayer player = this.player;
+                            final EntityPlayer player = this.player;
                             this.player = null;
                             this.ret = this.i - 1;
                             return player.getBukkitEntity();
@@ -115,16 +115,16 @@ public class ServerStatusPacketListenerImpl implements ServerStatusPacketListene
             }
 
             ServerListPingEvent event = new ServerListPingEvent();
-            this.server.server.getPluginManager().callEvent(event);
+            this.minecraftServer.server.getPluginManager().callEvent(event);
 
             java.util.List<GameProfile> profiles = new java.util.ArrayList<GameProfile>(players.length);
             for (Object player : players) {
                 if (player != null) {
-                    profiles.add(((ServerPlayer) player).getGameProfile());
+                    profiles.add(((EntityPlayer) player).getProfile());
                 }
             }
 
-            ServerStatus.Players playerSample = new ServerStatus.Players(event.getMaxPlayers(), profiles.size());
+            ServerPing.ServerPingPlayerSample playerSample = new ServerPing.ServerPingPlayerSample(event.getMaxPlayers(), profiles.size());
             // Spigot Start
             if ( !profiles.isEmpty() )
             {
@@ -132,16 +132,19 @@ public class ServerStatusPacketListenerImpl implements ServerStatusPacketListene
                 profiles = profiles.subList( 0, Math.min( profiles.size(), org.spigotmc.SpigotConfig.playerSample ) ); // Cap the sample to n (or less) displayed players, ie: Vanilla behaviour
             }
             // Spigot End
-            playerSample.setSample(profiles.toArray(new GameProfile[profiles.size()]));
+            playerSample.a(profiles.toArray(new GameProfile[profiles.size()]));
 
-            ServerStatus ping = new ServerStatus();
+            ServerPing ping = new ServerPing();
             ping.setFavicon(event.icon.value);
-            ping.setDescription(CraftChatMessage.fromString(event.getMotd(), true)[0]);
-            ping.setPlayers(playerSample);
-            int version = SharedConstants.getCurrentVersion().getProtocolVersion();
-            ping.setVersion(new ServerStatus.Version(server.getServerModName() + " " + server.getServerVersion(), version));
-
-            this.connection.send(new ClientboundStatusResponsePacket(ping));
+            ping.setMOTD(CraftChatMessage.fromString(event.getMotd(), true)[0]);
+            ping.setPlayerSample(playerSample);
+            int version = SharedConstants.getGameVersion().getProtocolVersion();
+            ping.setServerInfo(new ServerPing.ServerData(minecraftServer.getServerModName() + " " + minecraftServer.getVersion(), version));
+
+            this.networkManager.sendPacket(new PacketStatusOutServerInfo(ping));
+            */
+            com.destroystokyo.paper.network.StandardPaperServerListPingEventImpl.processRequest(this.server, this.connection);
+            // Paper end
         }
         // CraftBukkit end
     }
diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
index 3981ba5957fdc2929d54515f2b98bb7a4611e938..652b820a4c0bbf7b6bbb8200927a663665583606 100644
--- a/src/main/java/org/spigotmc/SpigotConfig.java
+++ b/src/main/java/org/spigotmc/SpigotConfig.java
@@ -289,7 +289,7 @@ public class SpigotConfig
     public static int playerSample;
     private static void playerSample()
     {
-        playerSample = getInt( "settings.sample-count", 12 );
+        playerSample = Math.max( getInt( "settings.sample-count", 12 ), 0 ); // Paper - Avoid negative counts
         Bukkit.getLogger().log( Level.INFO, "Server Ping Player Sample Count: {0}", playerSample ); // Paper - Use logger
     }