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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Minecrell <minecrell@minecrell.net>
Date: Wed, 11 Oct 2017 15:55:38 +0200
Subject: [PATCH] Add extended PaperServerListPingEvent
Add a new event that extends the original ServerListPingEvent
and allows full control of the response sent to the client.
diff --git a/src/main/java/com/destroystokyo/paper/event/server/PaperServerListPingEvent.java b/src/main/java/com/destroystokyo/paper/event/server/PaperServerListPingEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..0bb6fdbdd05ae6a8fb413e0f6b8d84302d697267
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/server/PaperServerListPingEvent.java
@@ -0,0 +1,338 @@
+package com.destroystokyo.paper.event.server;
+
+import static java.util.Objects.requireNonNull;
+
+import com.destroystokyo.paper.network.StatusClient;
+import com.destroystokyo.paper.profile.PlayerProfile;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.server.ServerListPingEvent;
+import org.bukkit.util.CachedServerIcon;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.UUID;
+
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Extended version of {@link ServerListPingEvent} that allows full control
+ * of the response sent to the client.
+ */
+public class PaperServerListPingEvent extends ServerListPingEvent implements Cancellable {
+
+ @NotNull private final StatusClient client;
+
+ private int numPlayers;
+ private boolean hidePlayers;
+ @NotNull private final List<PlayerProfile> playerSample = new ArrayList<>();
+
+ @NotNull private String version;
+ private int protocolVersion;
+
+ @Nullable private CachedServerIcon favicon;
+
+ private boolean cancelled;
+
+ private boolean originalPlayerCount = true;
+ private Object[] players;
+
+ @Deprecated
+ @ApiStatus.Internal
+ public PaperServerListPingEvent(@NotNull StatusClient client, @NotNull String motd, int numPlayers, int maxPlayers,
+ @NotNull String version, int protocolVersion, @Nullable CachedServerIcon favicon) {
+ super("", client.getAddress().getAddress(), motd, numPlayers, maxPlayers);
+ this.client = client;
+ this.numPlayers = numPlayers;
+ this.version = version;
+ this.protocolVersion = protocolVersion;
+ setServerIcon(favicon);
+ }
+
+ @ApiStatus.Internal
+ public PaperServerListPingEvent(@NotNull StatusClient client, @NotNull net.kyori.adventure.text.Component motd, int numPlayers, int maxPlayers,
+ @NotNull String version, int protocolVersion, @Nullable CachedServerIcon favicon) {
+ super("", client.getAddress().getAddress(), motd, numPlayers, maxPlayers);
+ this.client = client;
+ this.numPlayers = numPlayers;
+ this.version = version;
+ this.protocolVersion = protocolVersion;
+ setServerIcon(favicon);
+ }
+
+ /**
+ * Returns the {@link StatusClient} pinging the server.
+ *
+ * @return The client
+ */
+ @NotNull
+ public StatusClient getClient() {
+ return this.client;
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * <p>Returns {@code -1} if players are hidden using
+ * {@link #shouldHidePlayers()}.</p>
+ */
+ @Override
+ public int getNumPlayers() {
+ if (this.hidePlayers) {
+ return -1;
+ }
+
+ return this.numPlayers;
+ }
+
+ /**
+ * Sets the number of players displayed in the server list.
+ * <p>
+ * Note that this won't have any effect if {@link #shouldHidePlayers()}
+ * is enabled.
+ *
+ * @param numPlayers The number of online players
+ */
+ public void setNumPlayers(int numPlayers) {
+ if (this.numPlayers != numPlayers) {
+ this.numPlayers = numPlayers;
+ this.originalPlayerCount = false;
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ * <p>
+ * Returns {@code -1} if players are hidden using
+ * {@link #shouldHidePlayers()}.
+ */
+ @Override
+ public int getMaxPlayers() {
+ if (this.hidePlayers) {
+ return -1;
+ }
+
+ return super.getMaxPlayers();
+ }
+
+ /**
+ * Returns whether all player related information is hidden in the server
+ * list. This will cause {@link #getNumPlayers()}, {@link #getMaxPlayers()}
+ * and {@link #getPlayerSample()} to be skipped in the response.
+ * <p>
+ * The Vanilla Minecraft client will display the player count as {@code ???}
+ * when this option is enabled.
+ *
+ * @return {@code true} if the player count is hidden
+ */
+ public boolean shouldHidePlayers() {
+ return this.hidePlayers;
+ }
+
+ /**
+ * Sets whether all player related information is hidden in the server
+ * list. This will cause {@link #getNumPlayers()}, {@link #getMaxPlayers()}
+ * and {@link #getPlayerSample()} to be skipped in the response.
+ * <p>
+ * The Vanilla Minecraft client will display the player count as {@code ???}
+ * when this option is enabled.
+ *
+ * @param hidePlayers {@code true} if the player count should be hidden
+ */
+ public void setHidePlayers(boolean hidePlayers) {
+ this.hidePlayers = hidePlayers;
+ }
+
+ /**
+ * Returns a mutable list of {@link PlayerProfile} that will be displayed
+ * as online players on the client.
+ * <p>
+ * The Vanilla Minecraft client will display them when hovering the
+ * player count with the mouse.
+ *
+ * @return The mutable player sample list
+ */
+ @NotNull
+ public List<PlayerProfile> getPlayerSample() {
+ return this.playerSample;
+ }
+
+ /**
+ * Returns the version that will be sent as server version on the client.
+ *
+ * @return The server version
+ */
+ @NotNull
+ public String getVersion() {
+ return this.version;
+ }
+
+ /**
+ * Sets the version that will be sent as server version to the client.
+ *
+ * @param version The server version
+ */
+ public void setVersion(@NotNull String version) {
+ this.version = requireNonNull(version, "version");
+ }
+
+ /**
+ * Returns the protocol version that will be sent as the protocol version
+ * of the server to the client.
+ *
+ * @return The protocol version of the server, or {@code -1} if the server
+ * has not finished initialization yet
+ */
+ public int getProtocolVersion() {
+ return this.protocolVersion;
+ }
+
+ /**
+ * Sets the protocol version that will be sent as the protocol version
+ * of the server to the client.
+ *
+ * @param protocolVersion The protocol version of the server
+ */
+ public void setProtocolVersion(int protocolVersion) {
+ this.protocolVersion = protocolVersion;
+ }
+
+ /**
+ * Gets the server icon sent to the client.
+ *
+ * @return The icon to send to the client, or {@code null} for none
+ */
+ @Nullable
+ public CachedServerIcon getServerIcon() {
+ return this.favicon;
+ }
+
+ /**
+ * Sets the server icon sent to the client.
+ *
+ * @param icon The icon to send to the client, or {@code null} for none
+ */
+ @Override
+ public void setServerIcon(@Nullable CachedServerIcon icon) {
+ if (icon != null && icon.isEmpty()) {
+ // Represent empty icons as null
+ icon = null;
+ }
+
+ this.favicon = icon;
+ }
+
+ /**
+ * {@inheritDoc}
+ * <p>
+ * Cancelling this event will cause the connection to be closed immediately,
+ * without sending a response to the client.
+ */
+ @Override
+ public boolean isCancelled() {
+ return this.cancelled;
+ }
+
+ /**
+ * {@inheritDoc}
+ * <p>
+ * Cancelling this event will cause the connection to be closed immediately,
+ * without sending a response to the client.
+ */
+ @Override
+ public void setCancelled(boolean cancel) {
+ this.cancelled = cancel;
+ }
+
+ /**
+ * {@inheritDoc}
+ * <p>
+ * <b>Note:</b> For compatibility reasons, this method will return all
+ * online players, not just the ones referenced in {@link #getPlayerSample()}.
+ * Removing a player will:
+ *
+ * <ul>
+ * <li>Decrement the online player count (if and only if) the player
+ * count wasn't changed by another plugin before.</li>
+ * <li>Remove all entries from {@link #getPlayerSample()} that refer to
+ * the removed player (based on their {@link UUID}).</li>
+ * </ul>
+ */
+ @NotNull
+ @Override
+ public Iterator<Player> iterator() {
+ if (this.players == null) {
+ this.players = getOnlinePlayers();
+ }
+
+ return new PlayerIterator();
+ }
+
+ @NotNull
+ protected Object[] getOnlinePlayers() {
+ return Bukkit.getOnlinePlayers().toArray();
+ }
+
+ @NotNull
+ protected Player getBukkitPlayer(@NotNull Object player) {
+ return (Player) player;
+ }
+
+ @ApiStatus.Internal
+ private final class PlayerIterator implements Iterator<Player> {
+
+ private int next;
+ private int current;
+ @Nullable private Player player;
+
+ @Override
+ public boolean hasNext() {
+ for (; this.next < players.length; this.next++) {
+ if (players[this.next] != null) {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ @NotNull
+ @Override
+ public Player next() {
+ if (!hasNext()) {
+ this.player = null;
+ throw new NoSuchElementException();
+ }
+
+ this.current = this.next++;
+ return this.player = getBukkitPlayer(players[this.current]);
+ }
+
+ @Override
+ public void remove() {
+ if (this.player == null) {
+ throw new IllegalStateException();
+ }
+
+ UUID uniqueId = this.player.getUniqueId();
+ this.player = null;
+
+ // Remove player from iterator
+ players[this.current] = null;
+
+ // Remove player from sample
+ getPlayerSample().removeIf(p -> uniqueId.equals(p.getId()));
+
+ // Decrement player count
+ if (originalPlayerCount) {
+ numPlayers--;
+ }
+ }
+ }
+
+}
diff --git a/src/main/java/com/destroystokyo/paper/network/StatusClient.java b/src/main/java/com/destroystokyo/paper/network/StatusClient.java
new file mode 100644
index 0000000000000000000000000000000000000000..517d15238ed117f38bbd39f570874014cecf7bb5
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/network/StatusClient.java
@@ -0,0 +1,13 @@
+package com.destroystokyo.paper.network;
+
+import com.destroystokyo.paper.event.server.PaperServerListPingEvent;
+
+/**
+ * Represents a client requesting the current status from the server (e.g. from
+ * the server list).
+ *
+ * @see PaperServerListPingEvent
+ */
+public interface StatusClient extends NetworkClient {
+
+}
diff --git a/src/main/java/org/bukkit/util/CachedServerIcon.java b/src/main/java/org/bukkit/util/CachedServerIcon.java
index 9a7768d41270714d4a1c89b4dcb436cc66f57545..b74b21a1ac7798e847b6d34ff45026e1c9cfed14 100644
--- a/src/main/java/org/bukkit/util/CachedServerIcon.java
+++ b/src/main/java/org/bukkit/util/CachedServerIcon.java
@@ -18,4 +18,9 @@ public interface CachedServerIcon {
@Nullable
public String getData(); // Paper
+ // Paper start
+ default boolean isEmpty() {
+ return getData() == null;
+ }
+ // Paper end
}
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