add version check and notify user

pom.xml

@@ -112,6 +112,10 @@
             <id>placeholderapi</id>
             <url>https://repo.extendedclip.com/content/repositories/placeholderapi/</url>
         </repository>
+        <repository>
+            <id>viaversion-repo</id>
+            <url>https://repo.viaversion.com</url>
+        </repository>
     </repositories>
 
     <dependencies>
@@ -160,6 +164,13 @@
             <version>7.0.0</version>
             <scope>compile</scope>
         </dependency>
+
+        <dependency>
+            <groupId>com.viaversion</groupId>
+            <artifactId>viaversion-api</artifactId>
+            <version>4.9.2</version>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
 
 </project>

src/main/java/cc/fascinated/Aetheria.java

@@ -4,6 +4,7 @@ import cc.fascinated.account.AccountManager;
 import cc.fascinated.chat.ChatManager;
 import cc.fascinated.command.CommandManager;
 import cc.fascinated.metrics.MetricManager;
+import cc.fascinated.misc.PlayerVersionWarning;
 import cc.fascinated.motd.MotdManager;
 import cc.fascinated.placeholder.PlaceholderManager;
 import cc.fascinated.playercolor.PlayerColorManager;
@@ -44,5 +45,6 @@ public class Aetheria extends JavaPlugin {
         new PlayerColorManager();
         new ChatManager();
         new MotdManager();
+        new PlayerVersionWarning();
     }
 }

src/main/java/cc/fascinated/chat/ChatManager.java

@@ -31,7 +31,7 @@ public class ChatManager extends Manager {
 
     private final HashMap<Account, String> lastMessage = new HashMap<>();
     private final Pattern domainPattern = Pattern.compile("^((?!-)[A-Za-z0-9-]{1,63}(?<!-)\\.)+[A-Za-z]{2,8}$");
-    private final Pattern ipPattern = Pattern.compile("\\b(?:\\d{1,3}\\.){1,3}\\d{1,3}\\b");
+    private final Pattern ipPattern = Pattern.compile("\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b");
 
     @EventHandler
     public void onChat(AsyncChatEvent event) {

src/main/java/cc/fascinated/config/Config.java

@@ -17,7 +17,9 @@ public enum Config {
     DISCORD_LOG_WEBHOOK("discord.log-webhook"),
     MOTD_HEADER("motd.header"),
     MOTD_FORMAT("motd.format"),
-    MOTD_LIST("motd.motds");
+    MOTD_LIST("motd.motds"),
+    VERSION_WARNING_VERSION("version-warning.min-version"),
+    VERSION_WARNING_MESSAGE("version-warning.message");
 
     /**
      * The path of the lang in the lang.yml file.
@@ -70,4 +72,8 @@ public enum Config {
     public List<String> getAsStringList() {
         return (List<String>) get();
     }
+
+    public int getAsInt() {
+        return (int) get();
+    }
 }

src/main/java/cc/fascinated/misc/PlayerVersionWarning.java

@@ -0,0 +1,21 @@
+package cc.fascinated.misc;
+
+import cc.fascinated.config.Config;
+import cc.fascinated.utils.Manager;
+import cc.fascinated.utils.Style;
+import com.viaversion.viaversion.api.Via;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+public class PlayerVersionWarning extends Manager {
+
+    @EventHandler
+    public void onPlayerJoin(PlayerJoinEvent event) {
+        Player player = event.getPlayer();
+        int version = Via.getAPI().getPlayerVersion(player.getUniqueId());
+        if (version < Config.VERSION_WARNING_VERSION.getAsInt()) {
+            player.sendMessage(Style.getMiniMessage().deserialize(Config.VERSION_WARNING_MESSAGE.getAsString()));
+        }
+    }
+}

src/main/resources/config.yml

@@ -7,6 +7,10 @@ influxdb:
 discord:
   log-webhook: "https://discord.com/api/webhooks/1223162714822807572/jkqXHdcf4ov7MTC4fxx8MI2rSCoQTHONua8VOJa3ie5OtHBthqd5MGM7WGd7oHF52OOm"
 
+version-warning:
+  min-version: 763 # 1.20
+  message: "<red><bold>WARNING!</bold></red> <white>You are using an outdated version of Minecraft. Please update to the latest version to avoid any issues."
+
 motd:
   header: "<yellow>Aetheria</yellow>"
   format: "<gray>%motd%</gray>"

src/main/resources/plugin.yml

@@ -5,6 +5,7 @@ api-version: 1.20
 author: Fascinated
 depend:
   - PlaceholderAPI
+  - ViaVersion
 commands:
   totaljoins:
     description: "Shows the total amount of joins"