PaperMC/patches/server/0181-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 67455a5ba75c9b816213e44d6872c5ddf8e27e98..23efad80934930beadf15e65781551d4ba7ff81b 100644
--- a/src/main/java/net/minecraft/network/protocol/status/ClientboundStatusResponsePacket.java
+++ b/src/main/java/net/minecraft/network/protocol/status/ClientboundStatusResponsePacket.java
@@ -10,7 +10,9 @@ import net.minecraft.util.GsonHelper;
 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(io.papermc.paper.adventure.AdventureComponent.class, new io.papermc.paper.adventure.AdventureComponent.Serializer())
+        .create();
     private final ServerStatus status;
 
     public ClientboundStatusResponsePacket(ServerStatus metadata) {
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 543acb52698deb890a2624112e63be275a52c008..e9333b85100d7670b2be7df6e847dfca3084ff55 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;
@@ -1320,7 +1323,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             this.lastServerStatus = i;
             this.status.setPlayers(new ServerStatus.Players(this.getMaxPlayers(), this.getPlayerCount()));
             if (!this.hidesOnlinePlayers()) {
-                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 2b24a41587fbe1fba70a0ab42d3dc33358f2ba2e..4fa79d37ff4e70c61672cce7c55257c46232c026 100644
--- a/src/main/java/net/minecraft/server/network/ServerStatusPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerStatusPacketListenerImpl.java
@@ -47,6 +47,8 @@ public class ServerStatusPacketListenerImpl implements ServerStatusPacketListene
             this.connection.disconnect(ServerStatusPacketListenerImpl.DISCONNECT_REASON);
         } else {
             this.hasRequestedStatus = true;
+            // Paper start - Replace everything
+            /*
             // CraftBukkit start
             // this.connection.send(new PacketStatusOutServerInfo(this.server.getStatus()));
             final Object[] players = this.server.getPlayerList().players.toArray();
@@ -150,6 +152,9 @@ public class ServerStatusPacketListenerImpl implements ServerStatusPacketListene
 
             this.connection.send(new ClientboundStatusResponsePacket(ping));
             // CraftBukkit end
+            */
+            com.destroystokyo.paper.network.StandardPaperServerListPingEventImpl.processRequest(this.server, this.connection);
+            // Paper end
         }
     }
 
diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
index d73dfe72a54b621c0f944c90904df3e3bc709445..8e7630de11637a75a4a54a22283cbb2d0c7e6438 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()
     {
-        SpigotConfig.playerSample = SpigotConfig.getInt( "settings.sample-count", 12 );
+        SpigotConfig.playerSample = Math.max( SpigotConfig.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
     }