Add automatic version check on startup

src/main/java/de/construkter/footinfobot/Main.java

@@ -13,6 +13,7 @@
 import de.construkter.footinfobot.modules.news.NewsSender;
 import de.construkter.footinfobot.modules.notifications.ButtonListener;
 import de.construkter.footinfobot.modules.notifications.SendPanel;
+import de.construkter.footinfobot.modules.versionCheck.VersionChecker;
 import de.construkter.footinfobot.modules.welcome.JoinListener;
 import net.dv8tion.jda.api.JDA;
 import net.dv8tion.jda.api.JDABuilder;
@@ -47,6 +48,19 @@ public class Main extends ListenerAdapter {
     public static HashMap<User, List<Message>> messageCache = new HashMap<>();
 
     public static void main(String[] args) {
+        // Check if the bot is up to date
+        boolean upToDate = VersionChecker.isUpToDate();
+        if (!upToDate) {
+            LOGGER.warn("The Bot is not up to date! Please update to the latest version."
+                    + "\nhttps://github.com/construktdev/FootInfoBot");
+        }
+
+        try {
+            Thread.sleep(5000); // Wait for 5 seconds to ensure the user can read the update message
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+
         // Create a JDA Builder
         JDABuilder builder = JDABuilder.createDefault(Token.get(), GatewayIntent.MESSAGE_CONTENT,
                 GatewayIntent.GUILD_MESSAGES, GatewayIntent.GUILD_MEMBERS);

src/main/java/de/construkter/footinfobot/modules/versionCheck/VersionChecker.java

@@ -0,0 +1,13 @@
+package de.construkter.footinfobot.modules.versionCheck;
+
+import de.construkter.footinfobot.Main;
+
+public class VersionChecker {
+
+    private static final String remoteVersion = VersionFetcher.getRecentVersion();
+
+    public static boolean isUpToDate() {
+        String localVersion = Main.VERSION;
+        return localVersion.equals(remoteVersion);
+    }
+}

src/main/java/de/construkter/footinfobot/modules/versionCheck/VersionFetcher.java

@@ -0,0 +1,24 @@
+package de.construkter.footinfobot.modules.versionCheck;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+public class VersionFetcher {
+    public static String getRecentVersion() {
+        URI uri = URI.create("https://api.construkter.de/projects/footinfobot/version/");
+
+        try (BufferedReader reader = new BufferedReader(
+                new InputStreamReader(uri.toURL().openStream(), StandardCharsets.UTF_8))) {
+
+            String firstLine = reader.readLine();
+            return firstLine;
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}