Implemented checking for newer version against GitHub

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>de.b00tload.tools</groupId>
     <artifactId>LastfmToSpotifyPlaylist</artifactId>
-    <version>1.0</version>
+    <version>1.1-alpha</version>
 
     <name>LastFM2SpotifyPlaylist</name>
     <description>Creates a Spotify playlist from LastFM scrobble data.</description>
@@ -80,6 +80,8 @@
                     <archive>
                         <manifest>
                             <mainClass>de.b00tload.tools.lastfmtospotifyplaylist.LastFMToSpotify</mainClass>
+                            <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
+                            <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
                         </manifest>
                     </archive>
                 </configuration>
@@ -107,6 +109,11 @@
             <artifactId>slf4j-simple</artifactId>
             <version>2.0.6</version>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.11.0</version>
+        </dependency>
     </dependencies>
 
 </project>

src/main/java/de/b00tload/tools/lastfmtospotifyplaylist/LastFMToSpotify.java

@@ -12,9 +12,7 @@ import de.umass.lastfm.User;
 import io.javalin.Javalin;
 import io.javalin.http.ContentType;
 import io.javalin.http.HttpStatus;
-import io.javalin.jetty.JettyUtil;
 import io.javalin.util.JavalinLogger;
-import org.slf4j.LoggerFactory;
 import se.michaelthelin.spotify.SpotifyApi;
 import se.michaelthelin.spotify.model_objects.specification.Playlist;
 
@@ -79,6 +77,10 @@ public class LastFMToSpotify {
             System.setErr(new Logger.LogStream(System.err));
         }
 
+        if(Integer.parseInt(configuration.get("logging.level")) !=0){
+            VersionChecker.checkVerion();
+        }
+
         try {
             logLn("Authenticating with Spotify...", 1);
             SpotifyApi.Builder build = SpotifyApi.builder();

src/main/java/de/b00tload/tools/lastfmtospotifyplaylist/util/VersionChecker.java

@@ -0,0 +1,42 @@
+package de.b00tload.tools.lastfmtospotifyplaylist.util;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import org.apache.commons.io.IOUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+
+public class VersionChecker {
+
+    private static final String GITHUB_API_BASE_URL = "https://api.github.com/repos/B00tLoad/LastFMToSpotifyPlaylist";
+
+
+    public static void checkVerion() {
+        String currentVersion = VersionChecker.class.getPackage().getImplementationVersion();
+        String latestVersion = fetchLatestReleaseVersion();
+        if (currentVersion == null) {
+            System.out.println("Error: Failed to retrieve current version");
+        } else if (latestVersion == null) {
+            System.out.println("Error: Failed to retrieve latest release version");
+        } else if (currentVersion.compareTo(latestVersion) < 0) {
+            System.out.println("A new version is available: " + latestVersion);
+        } else {
+            System.out.println("You are running the latest version: " + currentVersion);
+        }
+    }
+
+    private static String fetchLatestReleaseVersion() {
+        try (InputStream inputStream = (new URL(GITHUB_API_BASE_URL + "/releases/latest")).openStream()) {
+            String response = IOUtils.toString(inputStream, StandardCharsets.UTF_8);
+            JsonObject release = JsonParser.parseString(response).getAsJsonObject();
+            return release.get("tag_name").getAsString().substring(1);
+        } catch (NullPointerException | IOException ex){
+            ex.printStackTrace();
+            return null;
+        }
+    }
+
+}