382 lines
12 KiB
Diff
382 lines
12 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Minecrell <minecrell@minecrell.net>
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Date: Wed, 11 Oct 2017 15:55:38 +0200
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Subject: [PATCH] Add extended PaperServerListPingEvent
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Add a new event that extends the original ServerListPingEvent
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and allows full control of the response sent to the client.
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diff --git a/src/main/java/com/destroystokyo/paper/event/server/PaperServerListPingEvent.java b/src/main/java/com/destroystokyo/paper/event/server/PaperServerListPingEvent.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..baac2e4f090a490372ef4aed92c8a5771955e921
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/event/server/PaperServerListPingEvent.java
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@@ -0,0 +1,334 @@
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+package com.destroystokyo.paper.event.server;
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+
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+import static java.util.Objects.requireNonNull;
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+
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+import com.destroystokyo.paper.network.StatusClient;
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+import com.destroystokyo.paper.profile.PlayerProfile;
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+import org.bukkit.Bukkit;
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+import org.bukkit.entity.Player;
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+import org.bukkit.event.Cancellable;
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+import org.bukkit.event.server.ServerListPingEvent;
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+import org.bukkit.util.CachedServerIcon;
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+
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+import java.util.ArrayList;
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+import java.util.Iterator;
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+import java.util.List;
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+import java.util.NoSuchElementException;
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+import java.util.UUID;
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+
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+import org.jetbrains.annotations.NotNull;
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+import org.jetbrains.annotations.Nullable;
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+
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+/**
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+ * Extended version of {@link ServerListPingEvent} that allows full control
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+ * of the response sent to the client.
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+ */
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+public class PaperServerListPingEvent extends ServerListPingEvent implements Cancellable {
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+
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+ @NotNull private final StatusClient client;
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+
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+ private int numPlayers;
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+ private boolean hidePlayers;
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+ @NotNull private final List<PlayerProfile> playerSample = new ArrayList<>();
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+
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+ @NotNull private String version;
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+ private int protocolVersion;
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+
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+ @Nullable private CachedServerIcon favicon;
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+
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+ private boolean cancelled;
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+
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+ private boolean originalPlayerCount = true;
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+ private Object[] players;
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+
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+ @Deprecated
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+ public PaperServerListPingEvent(@NotNull StatusClient client, @NotNull String motd, int numPlayers, int maxPlayers,
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+ @NotNull String version, int protocolVersion, @Nullable CachedServerIcon favicon) {
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+ super(client.getAddress().getAddress(), motd, numPlayers, maxPlayers);
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+ this.client = client;
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+ this.numPlayers = numPlayers;
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+ this.version = version;
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+ this.protocolVersion = protocolVersion;
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+ setServerIcon(favicon);
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+ }
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+
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+ public PaperServerListPingEvent(@NotNull StatusClient client, @NotNull net.kyori.adventure.text.Component motd, int numPlayers, int maxPlayers,
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+ @NotNull String version, int protocolVersion, @Nullable CachedServerIcon favicon) {
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+ super(client.getAddress().getAddress(), motd, numPlayers, maxPlayers);
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+ this.client = client;
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+ this.numPlayers = numPlayers;
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+ this.version = version;
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+ this.protocolVersion = protocolVersion;
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+ setServerIcon(favicon);
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+ }
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+
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+ /**
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+ * Returns the {@link StatusClient} pinging the server.
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+ *
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+ * @return The client
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+ */
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+ @NotNull
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+ public StatusClient getClient() {
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+ return this.client;
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+ }
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+
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+ /**
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+ * {@inheritDoc}
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+ *
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+ * <p>Returns {@code -1} if players are hidden using
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+ * {@link #shouldHidePlayers()}.</p>
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+ */
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+ @Override
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+ public int getNumPlayers() {
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+ if (this.hidePlayers) {
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+ return -1;
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+ }
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+
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+ return this.numPlayers;
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+ }
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+
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+ /**
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+ * Sets the number of players displayed in the server list.
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+ *
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+ * <p>Note that this won't have any effect if {@link #shouldHidePlayers()}
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+ * is enabled.</p>
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+ *
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+ * @param numPlayers The number of online players
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+ */
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+ public void setNumPlayers(int numPlayers) {
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+ if (this.numPlayers != numPlayers) {
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+ this.numPlayers = numPlayers;
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+ this.originalPlayerCount = false;
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+ }
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+ }
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+
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+ /**
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+ * {@inheritDoc}
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+ *
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+ * <p>Returns {@code -1} if players are hidden using
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+ * {@link #shouldHidePlayers()}.</p>
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+ */
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+ @Override
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+ public int getMaxPlayers() {
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+ if (this.hidePlayers) {
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+ return -1;
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+ }
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+
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+ return super.getMaxPlayers();
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+ }
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+
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+ /**
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+ * Returns whether all player related information is hidden in the server
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+ * list. This will cause {@link #getNumPlayers()}, {@link #getMaxPlayers()}
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+ * and {@link #getPlayerSample()} to be skipped in the response.
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+ *
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+ * <p>The Vanilla Minecraft client will display the player count as {@code ???}
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+ * when this option is enabled.</p>
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+ *
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+ * @return {@code true} if the player count is hidden
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+ */
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+ public boolean shouldHidePlayers() {
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+ return hidePlayers;
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+ }
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+
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+ /**
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+ * Sets whether all player related information is hidden in the server
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+ * list. This will cause {@link #getNumPlayers()}, {@link #getMaxPlayers()}
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+ * and {@link #getPlayerSample()} to be skipped in the response.
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+ *
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+ * <p>The Vanilla Minecraft client will display the player count as {@code ???}
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+ * when this option is enabled.</p>
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+ *
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+ * @param hidePlayers {@code true} if the player count should be hidden
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+ */
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+ public void setHidePlayers(boolean hidePlayers) {
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+ this.hidePlayers = hidePlayers;
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+ }
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+
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+ /**
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+ * Returns a mutable list of {@link PlayerProfile} that will be displayed
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+ * as online players on the client.
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+ *
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+ * <p>The Vanilla Minecraft client will display them when hovering the
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+ * player count with the mouse.</p>
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+ *
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+ * @return The mutable player sample list
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+ */
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+ @NotNull
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+ public List<PlayerProfile> getPlayerSample() {
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+ return this.playerSample;
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+ }
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+
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+ /**
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+ * Returns the version that will be sent as server version on the client.
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+ *
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+ * @return The server version
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+ */
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+ @NotNull
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+ public String getVersion() {
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+ return version;
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+ }
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+
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+ /**
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+ * Sets the version that will be sent as server version to the client.
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+ *
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+ * @param version The server version
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+ */
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+ public void setVersion(@NotNull String version) {
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+ this.version = requireNonNull(version, "version");
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+ }
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+
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+ /**
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+ * Returns the protocol version that will be sent as the protocol version
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+ * of the server to the client.
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+ *
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+ * @return The protocol version of the server, or {@code -1} if the server
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+ * has not finished initialization yet
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+ */
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+ public int getProtocolVersion() {
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+ return protocolVersion;
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+ }
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+
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+ /**
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+ * Sets the protocol version that will be sent as the protocol version
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+ * of the server to the client.
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+ *
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+ * @param protocolVersion The protocol version of the server
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+ */
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+ public void setProtocolVersion(int protocolVersion) {
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+ this.protocolVersion = protocolVersion;
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+ }
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+
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+ /**
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+ * Gets the server icon sent to the client.
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+ *
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+ * @return The icon to send to the client, or {@code null} for none
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+ */
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+ @Nullable
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+ public CachedServerIcon getServerIcon() {
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+ return this.favicon;
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+ }
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+
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+ /**
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+ * Sets the server icon sent to the client.
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+ *
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+ * @param icon The icon to send to the client, or {@code null} for none
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+ */
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+ @Override
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+ public void setServerIcon(@Nullable CachedServerIcon icon) {
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+ if (icon != null && icon.isEmpty()) {
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+ // Represent empty icons as null
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+ icon = null;
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+ }
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+
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+ this.favicon = icon;
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+ }
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+
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+ /**
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+ * {@inheritDoc}
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+ *
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+ * <p>Cancelling this event will cause the connection to be closed immediately,
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+ * without sending a response to the client.</p>
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+ */
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+ @Override
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+ public boolean isCancelled() {
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+ return this.cancelled;
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+ }
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+
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+ /**
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+ * {@inheritDoc}
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+ *
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+ * <p>Cancelling this event will cause the connection to be closed immediately,
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+ * without sending a response to the client.</p>
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+ */
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+ @Override
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+ public void setCancelled(boolean cancel) {
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+ this.cancelled = cancel;
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+ }
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+
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+ /**
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+ * {@inheritDoc}
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+ *
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+ * <p><b>Note:</b> For compatibility reasons, this method will return all
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+ * online players, not just the ones referenced in {@link #getPlayerSample()}.
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+ * Removing a player will:</p>
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+ *
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+ * <ul>
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+ * <li>Decrement the online player count (if and only if) the player
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+ * count wasn't changed by another plugin before.</li>
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+ * <li>Remove all entries from {@link #getPlayerSample()} that refer to
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+ * the removed player (based on their {@link UUID}).</li>
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+ * </ul>
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+ */
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+ @NotNull
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+ @Override
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+ public Iterator<Player> iterator() {
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+ if (this.players == null) {
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+ this.players = getOnlinePlayers();
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+ }
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+
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+ return new PlayerIterator();
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+ }
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+
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+ @NotNull
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+ protected Object[] getOnlinePlayers() {
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+ return Bukkit.getOnlinePlayers().toArray();
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+ }
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+
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+ @NotNull
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+ protected Player getBukkitPlayer(@NotNull Object player) {
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+ return (Player) player;
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+ }
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+
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+ private final class PlayerIterator implements Iterator<Player> {
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+
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+ private int next;
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+ private int current;
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+ @Nullable private Player player;
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+
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+ @Override
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+ public boolean hasNext() {
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+ for (; this.next < players.length; this.next++) {
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+ if (players[this.next] != null) {
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+ return true;
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+ }
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+ }
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+
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+ return false;
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+ }
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+
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+ @NotNull
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+ @Override
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+ public Player next() {
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+ if (!hasNext()) {
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+ this.player = null;
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+ throw new NoSuchElementException();
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+ }
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+
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+ this.current = this.next++;
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+ return this.player = getBukkitPlayer(players[this.current]);
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+ }
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+
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+ @Override
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+ public void remove() {
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+ if (this.player == null) {
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+ throw new IllegalStateException();
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+ }
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+
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+ UUID uniqueId = this.player.getUniqueId();
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+ this.player = null;
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+
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+ // Remove player from iterator
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+ players[this.current] = null;
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+
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+ // Remove player from sample
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+ getPlayerSample().removeIf(p -> uniqueId.equals(p.getId()));
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+
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+ // Decrement player count
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+ if (originalPlayerCount) {
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+ numPlayers--;
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+ }
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+ }
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+ }
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+
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+}
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diff --git a/src/main/java/com/destroystokyo/paper/network/StatusClient.java b/src/main/java/com/destroystokyo/paper/network/StatusClient.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..517d15238ed117f38bbd39f570874014cecf7bb5
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--- /dev/null
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+++ b/src/main/java/com/destroystokyo/paper/network/StatusClient.java
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@@ -0,0 +1,13 @@
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+package com.destroystokyo.paper.network;
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+
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+import com.destroystokyo.paper.event.server.PaperServerListPingEvent;
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+
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+/**
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+ * Represents a client requesting the current status from the server (e.g. from
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+ * the server list).
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+ *
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+ * @see PaperServerListPingEvent
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+ */
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+public interface StatusClient extends NetworkClient {
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+
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+}
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diff --git a/src/main/java/org/bukkit/util/CachedServerIcon.java b/src/main/java/org/bukkit/util/CachedServerIcon.java
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index 612958a331575d1da2715531ebdf6b1168f2e860..bb4f7702ced0baf0670a7a21d48ad528b7249361 100644
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--- a/src/main/java/org/bukkit/util/CachedServerIcon.java
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+++ b/src/main/java/org/bukkit/util/CachedServerIcon.java
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@@ -18,4 +18,9 @@ public interface CachedServerIcon {
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@Nullable
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public String getData(); // Paper
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+ // Paper start
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+ default boolean isEmpty() {
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+ return getData() == null;
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+ }
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+ // Paper end
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}
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