Add server link's feature.

eternalcore-core/src/main/java/com/eternalcode/core/configuration/implementation/PluginConfiguration.java

@@ -9,6 +9,7 @@
 import com.eternalcode.core.feature.helpop.HelpOpSettings;
 import com.eternalcode.core.feature.jail.JailSettings;
 import com.eternalcode.core.feature.randomteleport.RandomTeleportSettingsImpl;
+import com.eternalcode.core.feature.serverlinks.ServerLinksConfig;
 import com.eternalcode.core.feature.spawn.SpawnSettings;
 import com.eternalcode.core.injector.annotations.Bean;
 import com.eternalcode.core.injector.annotations.component.ConfigurationFile;
@@ -440,6 +441,10 @@ public float getCatboyWalkSpeed() {
         }
     }
 
+    @Bean
+    @Description({ " ", "# ServerLinks Section" })
+    ServerLinksConfig serverLinks = new ServerLinksConfig();
+
     @Override
     public Resource resource(File folder) {
         return Source.of(folder, "config.yml");

eternalcore-core/src/main/java/com/eternalcode/core/feature/serverlinks/ServerLinksConfig.java

@@ -0,0 +1,21 @@
+package com.eternalcode.core.feature.serverlinks;
+
+import java.util.List;
+import net.dzikoysk.cdn.entity.Contextual;
+import net.dzikoysk.cdn.entity.Description;
+
+@Contextual
+public class ServerLinksConfig {
+
+    @Description({
+        "# Configuration of server links displayed in the ESC/pause menu",
+        "# Links will be visible in the game's pause menu under server information",
+        "# Note: This feature requires Minecraft version 1.21 or newer to work properly"
+    })
+    public boolean sendLinksOnJoin = true;
+
+    public List<ServerLinksEntry> serverLinks = List.of(
+        ServerLinksEntry.of("<rainbow>Discord", "https://discord.gg/v2rkPb4Q2r"),
+        ServerLinksEntry.of("Website", "https://www.eternalcode.pl")
+    );
+}

eternalcore-core/src/main/java/com/eternalcode/core/feature/serverlinks/ServerLinksController.java

@@ -0,0 +1,30 @@
+package com.eternalcode.core.feature.serverlinks;
+
+import com.eternalcode.core.compatibility.Compatibility;
+import com.eternalcode.core.compatibility.Version;
+import com.eternalcode.core.injector.annotations.Inject;
+import com.eternalcode.core.injector.annotations.component.Controller;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+@Controller
+@Compatibility(from = @Version(minor = 21, patch = 0))
+public class ServerLinksController implements Listener {
+
+    private final ServerLinksService serverLinksService;
+    private final ServerLinksConfig serverLinksConfig;
+
+    @Inject
+    public ServerLinksController(ServerLinksService serverLinksService, ServerLinksConfig serverLinksConfig) {
+        this.serverLinksService = serverLinksService;
+        this.serverLinksConfig = serverLinksConfig;
+    }
+
+    @EventHandler
+    public void onJoin(PlayerJoinEvent event) {
+        if (this.serverLinksConfig.sendLinksOnJoin) {
+            this.serverLinksService.sendServerLinks(event.getPlayer());
+        }
+    }
+}

eternalcore-core/src/main/java/com/eternalcode/core/feature/serverlinks/ServerLinksEntry.java

@@ -0,0 +1,27 @@
+package com.eternalcode.core.feature.serverlinks;
+
+import net.dzikoysk.cdn.entity.Contextual;
+
+@Contextual
+public class ServerLinksEntry {
+
+    public final String name;
+    public final String address;
+
+    public ServerLinksEntry(String name, String address) {
+        this.name = name;
+        this.address = address;
+    }
+
+    public static ServerLinksEntry of(String name, String address) {
+        return new ServerLinksEntry(name, address);
+    }
+
+    public String name() {
+        return name;
+    }
+
+    public String address() {
+        return address;
+    }
+}

eternalcore-core/src/main/java/com/eternalcode/core/feature/serverlinks/ServerLinksService.java

@@ -0,0 +1,66 @@
+package com.eternalcode.core.feature.serverlinks;
+
+import static net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer.legacySection;
+
+import com.eternalcode.core.compatibility.Compatibility;
+import com.eternalcode.core.compatibility.Version;
+import com.eternalcode.core.injector.annotations.Inject;
+import com.eternalcode.core.injector.annotations.component.Service;
+import java.net.URI;
+import java.net.URISyntaxException;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import org.bukkit.ServerLinks;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+@Service
+@Compatibility(from = @Version(minor = 21, patch = 0))
+public class ServerLinksService {
+
+    private final Plugin plugin;
+    private final MiniMessage miniMessage;
+    private final ServerLinksConfig config;
+
+    @Inject
+    public ServerLinksService(Plugin plugin, MiniMessage miniMessage, ServerLinksConfig config) {
+        this.plugin = plugin;
+        this.miniMessage = miniMessage;
+        this.config = config;
+    }
+
+    public void sendServerLinks(Player player) {
+        ServerLinks serverLinks = this.plugin.getServer().getServerLinks().copy();
+
+        for (ServerLinksEntry serverLink : this.config.serverLinks) {
+            this.parseLinks(serverLinks, serverLink);
+        }
+
+        player.sendLinks(serverLinks);
+    }
+
+    private URI parseUrl(String url) {
+        try {
+            if (!url.startsWith("https://") && !url.startsWith("http://")) {
+                return null;
+            }
+            return new URI(url);
+        }
+        catch (URISyntaxException exception) {
+            return null;
+        }
+    }
+
+    private org.bukkit.ServerLinks.ServerLink parseLinks(org.bukkit.ServerLinks serverLinks, ServerLinksEntry links) {
+        URI url = parseUrl(links.address());
+
+        if (url == null) {
+            return null;
+        }
+
+        // TODO: Use ServerLinks#addLinks(Component, URI) instead of ServerLinks#addLink(String, URI) when we use
+        //  PaperAPI in nearly future.
+        Component deserialize = this.miniMessage.deserialize(links.name());
+        return serverLinks.addLink(legacySection().serialize(deserialize), url);
+    }
+}

eternalcore-core/src/main/java/com/eternalcode/core/feature/serverlinks/package-info.java

@@ -0,0 +1,6 @@
+package com.eternalcode.core.feature.serverlinks;
+
+
+/*
+This feature work's only with Minecraft version 1.21 or newer
+ */