Added HeaderAndFooter packet. Modified config file. Take username for playerlist not from version string

Dockerfile

@@ -0,0 +1,10 @@
+FROM openjdk:17-alpine3.14
+
+ENV JAVA_HEAP_SIZE="1G"
+ENV JAVA_ARGS=""
+
+WORKDIR /app
+
+COPY build/libs/NanoLimbo-*-all.jar server.jar
+
+ENTRYPOINT java $JAVA_ARGS -Xmx$JAVA_HEAP_SIZE -Xms$JAVA_HEAP_SIZE -jar server.jar

src/main/java/ru/nanit/limbo/configuration/LimboConfig.java

@@ -51,11 +51,17 @@ public final class LimboConfig {
     private boolean useBossBar;
     private boolean useTitle;
     private boolean usePlayerList;
+    private boolean useHeaderAndFooter;
+
     private String brandName;
     private String joinMessage;
     private BossBar bossBar;
     private Title title;
 
+    private String playerListUsername;
+    private String playerListHeader;
+    private String playerListFooter;
+
     private InfoForwarding infoForwarding;
     private long readTimeout;
     private int debugLevel = 3;
@@ -87,7 +93,8 @@ public final class LimboConfig {
         useJoinMessage = conf.node("joinMessage", "enable").getBoolean();
         useBossBar = conf.node("bossBar", "enable").getBoolean();
         useTitle = conf.node("title", "enable").getBoolean();
-        usePlayerList = conf.node("playerList").getBoolean();
+        usePlayerList = conf.node("playerList", "enable").getBoolean();
+        useHeaderAndFooter = conf.node("headerAndFooter", "enable").getBoolean();
 
         if (useBrandName)
             brandName = conf.node("brandName", "content").getString();
@@ -101,6 +108,14 @@ public final class LimboConfig {
         if (useTitle)
             title = conf.node("title").get(Title.class);
 
+        if (usePlayerList)
+            playerListUsername = conf.node("playerList", "username").getString();
+
+        if (useHeaderAndFooter) {
+            playerListHeader = conf.node("headerAndFooter", "header").getString();
+            playerListFooter = conf.node("headerAndFooter", "footer").getString();
+        }
+
         infoForwarding = conf.node("infoForwarding").get(InfoForwarding.class);
         readTimeout = conf.node("readTimeout").getLong();
         debugLevel = conf.node("debugLevel").getInt();
@@ -193,6 +208,10 @@ public final class LimboConfig {
         return usePlayerList;
     }
 
+    public boolean isUseHeaderAndFooter() {
+        return useHeaderAndFooter;
+    }
+
     public String getBrandName() {
         return brandName;
     }
@@ -209,6 +228,18 @@ public final class LimboConfig {
         return title;
     }
 
+    public String getPlayerListUsername() {
+        return playerListUsername;
+    }
+
+    public String getPlayerListHeader() {
+        return playerListHeader;
+    }
+
+    public String getPlayerListFooter() {
+        return playerListFooter;
+    }
+
     public boolean isUseEpoll() {
         return useEpoll;
     }

src/main/java/ru/nanit/limbo/connection/ClientConnection.java

@@ -65,6 +65,7 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
     private static PacketSnapshot PACKET_PLAYER_POS;
     private static PacketSnapshot PACKET_JOIN_MESSAGE;
     private static PacketSnapshot PACKET_BOSS_BAR;
+    private static PacketSnapshot PACKET_HEADER_AND_FOOTER;
 
     private static PacketSnapshot PACKET_TITLE_TITLE;
     private static PacketSnapshot PACKET_TITLE_SUBTITLE;
@@ -240,19 +241,12 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         writePacket(PACKET_PLAYER_ABILITIES);
         writePacket(PACKET_PLAYER_POS);
 
-        if (clientVersion.moreOrEqual(Version.V1_17)) {
+        if (PACKET_PLAYER_INFO != null && !clientVersion.equals(Version.V1_16_4))
-            if (server.getConfig().isUsePlayerList()) {
             writePacket(PACKET_PLAYER_INFO);
-            }
-        }
-        else {
-            writePacket(PACKET_PLAYER_INFO);
-        }
 
         if (clientVersion.moreOrEqual(Version.V1_13)){
             writePacket(PACKET_DECLARE_COMMANDS);
 
-
             if (PACKET_PLUGIN_MESSAGE != null)
                 writePacket(PACKET_PLUGIN_MESSAGE);
         }
@@ -266,6 +260,9 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         if (PACKET_TITLE_TITLE != null)
             writeTitle();
 
+        if (PACKET_HEADER_AND_FOOTER != null)
+            writePacket(PACKET_HEADER_AND_FOOTER);
+
         sendKeepAlive();
     }
 
@@ -430,11 +427,6 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         positionAndLook.setPitch(server.getConfig().getSpawnPosition().getPitch());
         positionAndLook.setTeleportId(ThreadLocalRandom.current().nextInt());
 
-        PacketPlayerInfo info = new PacketPlayerInfo();
-        info.setUsername(username);
-        info.setGameMode(server.getConfig().getGameMode());
-        info.setUuid(uuid);
-
         PacketDeclareCommands declareCommands = new PacketDeclareCommands();
         declareCommands.setCommands(Collections.emptyList());
 
@@ -443,9 +435,22 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         PACKET_PLAYER_ABILITIES = PacketSnapshot.of(playerAbilities);
         PACKET_PLAYER_POS = PacketSnapshot.of(positionAndLook);
 
+        PACKET_DECLARE_COMMANDS = PacketSnapshot.of(declareCommands);
+
+        if (server.getConfig().isUsePlayerList()) {
+            PacketPlayerInfo info = new PacketPlayerInfo();
+            info.setUsername(server.getConfig().getPlayerListUsername());
+            info.setGameMode(server.getConfig().getGameMode());
+            info.setUuid(uuid);
             PACKET_PLAYER_INFO = PacketSnapshot.of(info);
 
-        PACKET_DECLARE_COMMANDS = PacketSnapshot.of(declareCommands);
+            if (server.getConfig().isUseHeaderAndFooter()) {
+                PacketPlayerListHeader header = new PacketPlayerListHeader();
+                header.setHeader(server.getConfig().getPlayerListHeader());
+                header.setFooter(server.getConfig().getPlayerListFooter());
+                PACKET_HEADER_AND_FOOTER = PacketSnapshot.of(header);
+            }
+        }
 
         if (server.getConfig().isUseBrandName()){
             PacketPluginMessage pluginMessage = new PacketPluginMessage();

src/main/java/ru/nanit/limbo/protocol/packets/play/PacketPlayerListHeader.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2020 Nan1t
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package ru.nanit.limbo.protocol.packets.play;
+
+import ru.nanit.limbo.protocol.ByteMessage;
+import ru.nanit.limbo.protocol.PacketOut;
+import ru.nanit.limbo.protocol.registry.Version;
+
+public class PacketPlayerListHeader implements PacketOut {
+
+    private String header;
+    private String footer;
+
+    public void setHeader(String header) {
+        this.header = header;
+    }
+
+    public void setFooter(String footer) {
+        this.footer = footer;
+    }
+
+    @Override
+    public void encode(ByteMessage msg, Version version) {
+        msg.writeString(header);
+        msg.writeString(footer);
+    }
+}

src/main/java/ru/nanit/limbo/protocol/packets/play/PacketPluginMessage.java

@@ -26,10 +26,11 @@ public class PacketPluginMessage implements PacketOut {
     private String channel;
     private String message;
 
-    public void setChannel(String channel){
+    public void setChannel(String channel) {
         this.channel = channel;
     }
-    public void setMessage(String message){
+
+    public void setMessage(String message) {
         this.message = message;
     }
 

src/main/java/ru/nanit/limbo/protocol/registry/State.java

@@ -189,6 +189,19 @@ public enum State {
                     map(0x5A, V1_17, V1_17_1),
                     map(0x5B, V1_18, V1_18)
             );
+            clientBound.register(PacketPlayerListHeader::new,
+                    map(0x47, V1_8, V1_8),
+                    map(0x48, V1_9, V1_9_2),
+                    map(0x47, V1_9_4, V1_11_1),
+                    map(0x49, V1_12, V1_12),
+                    map(0x4A, V1_12_1, V1_12_2),
+                    map(0x4E, V1_13, V1_13_2),
+                    map(0x53, V1_14, V1_14_4),
+                    map(0x54, V1_15, V1_15_2),
+                    map(0x53, V1_16, V1_16_4),
+                    map(0x5E, V1_17, V1_17_1),
+                    map(0x5F, V1_18, V1_18)
+            );
         }
     };
 

src/main/resources/settings.yml

@@ -20,7 +20,16 @@ ping:
 dimension: THE_END
 
 # Whether to display the player in the player list
-playerList: true
+playerList:
+  enable: false
+  username: 'NanoLimbo'
+
+# Whether to display header and footer in player list
+# Enable it only if you enabled playerList
+headerAndFooter:
+  enable: false
+  header: '{"text": "&eWelcome!"}'
+  footer: '{"text": "&9NanoLimbo"}'
 
 # Spawn position in the world
 spawnPosition: