added OptionLinks which are shown to the client as 'Server Links'

src/main/java/eu/mhsl/craftattack/spawn/Main.java

@@ -19,6 +19,7 @@ import eu.mhsl.craftattack.spawn.appliances.hotbarRefill.HotbarRefill;
 import eu.mhsl.craftattack.spawn.appliances.kick.Kick;
 import eu.mhsl.craftattack.spawn.appliances.knockDoor.KnockDoor;
 import eu.mhsl.craftattack.spawn.appliances.maintenance.Maintenance;
+import eu.mhsl.craftattack.spawn.appliances.optionLinks.OptionLinks;
 import eu.mhsl.craftattack.spawn.appliances.outlawed.Outlawed;
 import eu.mhsl.craftattack.spawn.appliances.packSelect.PackSelect;
 import eu.mhsl.craftattack.spawn.appliances.panicBan.PanicBan;
@@ -87,7 +88,8 @@ public final class Main extends JavaPlugin {
             new KnockDoor(),
             new PackSelect(),
             new GlowingBerries(),
-            new Maintenance()
+            new Maintenance(),
+            new OptionLinks()
         )
             .filter(appliance -> disabledAppliances.stream()
                 .noneMatch(s -> s.equalsIgnoreCase(appliance.getClass().getSimpleName())))

src/main/java/eu/mhsl/craftattack/spawn/appliances/optionLinks/OptionLinks.java

@@ -0,0 +1,68 @@
+package eu.mhsl.craftattack.spawn.appliances.optionLinks;
+
+import eu.mhsl.craftattack.spawn.Main;
+import eu.mhsl.craftattack.spawn.appliance.Appliance;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import org.bukkit.Bukkit;
+import org.bukkit.ServerLinks;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Listener;
+import org.jetbrains.annotations.NotNull;
+
+import java.net.URI;
+import java.util.List;
+import java.util.function.Function;
+import java.util.logging.Level;
+
+@SuppressWarnings("UnstableApiUsage")
+public class OptionLinks extends Appliance {
+    record ComponentSupplier() {}
+    record UriSupplier(Player player) {}
+    record UriConsumer(String uri) {}
+    record SuppliedLink(Function<ComponentSupplier, Component> component, Function<UriSupplier, UriConsumer> uri) {}
+
+    List<SuppliedLink> links = List.of(
+        new SuppliedLink(
+            componentSupplier -> Component.text("CraftAttack Homepage", NamedTextColor.GOLD),
+            uriSupplier -> new UriConsumer("https://mhsl.eu/craftattack")
+        ),
+        new SuppliedLink(
+            componentSupplier -> Component.text("Regeln", NamedTextColor.GOLD),
+            uriSupplier -> new UriConsumer("https://mhsl.eu/craftattack/rules")
+        )
+    );
+
+    @Override
+    public void onEnable() {
+        Bukkit.getServer().getServerLinks().getLinks()
+            .forEach(serverLink -> Bukkit.getServer().getServerLinks().removeLink(serverLink));
+    }
+
+    public void setServerLinks(Player player) {
+        ServerLinks playerLinks = Bukkit.getServerLinks().copy();
+        Main.logger().info("Set server links for " + player.getName());
+
+         Bukkit.getScheduler().runTaskAsynchronously(Main.instance(), () -> {
+             this.links.forEach(suppliedLink -> {
+                 Component component = suppliedLink.component.apply(new ComponentSupplier());
+                 String uri = suppliedLink.uri.apply(new UriSupplier(player)).uri;
+
+                 try {
+                     playerLinks.addLink(component, URI.create(uri));
+                 } catch(IllegalArgumentException e) {
+                     Main.logger().log(Level.INFO, String.format("Failed to create OptionLink '%s' for player '%s'", uri, player.getName()), e);
+                 }
+             });
+
+             Main.logger().info("Sent links for " + player.getName());
+
+             player.sendLinks(playerLinks);
+         });
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(new UpdateLinksListener());
+    }
+}

src/main/java/eu/mhsl/craftattack/spawn/appliances/optionLinks/UpdateLinksListener.java

@@ -0,0 +1,12 @@
+package eu.mhsl.craftattack.spawn.appliances.optionLinks;
+
+import eu.mhsl.craftattack.spawn.appliance.ApplianceListener;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+public class UpdateLinksListener extends ApplianceListener<OptionLinks> {
+    @EventHandler
+    public void onJoin(PlayerJoinEvent event) {
+        getAppliance().setServerLinks(event.getPlayer());
+    }
+}