add location to the server response

src/main/java/xyz/mcutils/backend/service/MaxMindService.java

@@ -0,0 +1,116 @@
+package xyz.mcutils.backend.service;
+
+import com.maxmind.geoip2.DatabaseReader;
+import com.maxmind.geoip2.exception.GeoIp2Exception;
+import com.maxmind.geoip2.model.CityResponse;
+import lombok.SneakyThrows;
+import lombok.extern.log4j.Log4j2;
+import org.codehaus.plexus.archiver.tar.TarGZipUnArchiver;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import xyz.mcutils.backend.Main;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.URI;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+@Service
+@Log4j2(topic = "MaxMind Service")
+public class MaxMindService {
+    /**
+     * The MaxMind database.
+     */
+    private static DatabaseReader database;
+
+    /**
+     * The location of the MaxMind database.
+     */
+    private final String databaseName = "maxmind.mmdb";
+
+    /**
+     * The MaxMind license key.
+     */
+    private final String maxMindLicense;
+
+    public MaxMindService(@Value("${maxmind.license}") String maxMindLicense) {
+        this.maxMindLicense = maxMindLicense;
+
+        File databaseFile = loadDatabase();
+        try {
+            database = new DatabaseReader.Builder(databaseFile).build();
+            log.info("Loaded the MaxMind database from '{}'", databaseFile.getAbsolutePath());
+        } catch (Exception ex) {
+            log.error("Failed to load the MaxMind database, please check the configuration and try again", ex);
+            System.exit(1);
+        }
+    }
+
+    /**
+     * Lookup the GeoIP information for the query.
+     *
+     * @param query The query to lookup
+     * @return The GeoIP information
+     */
+    public static CityResponse lookup(String query) {
+        try {
+            return database.city(InetAddress.getByName(query));
+        } catch (IOException | GeoIp2Exception e) {
+            log.error("Failed to lookup the GeoIP information for '{}'", query, e);
+            throw new RuntimeException("Failed to lookup the GeoIP information for '%s'".formatted(query));
+        }
+    }
+
+    @SneakyThrows
+    private File loadDatabase() {
+        File database = new File("data", databaseName);
+        if (database.exists()) {
+            return database;
+        }
+
+        // Ensure the parent directories exist
+        database.getParentFile().mkdirs();
+
+        String downloadUrl = "https://download.maxmind.com/app/geoip_download?edition_id=GeoLite2-City&license_key=%s&suffix=tar.gz";
+        HttpResponse<Path> response = Main.HTTP_CLIENT.send(HttpRequest.newBuilder()
+                .uri(URI.create(downloadUrl.formatted(maxMindLicense)))
+                .build(), HttpResponse.BodyHandlers.ofFile(Files.createTempFile("maxmind", ".tar.gz")));
+        Path downloadedFile = response.body();
+
+        File tempDir = Files.createTempDirectory("maxmind").toFile();
+
+        TarGZipUnArchiver archiver = new TarGZipUnArchiver();
+        archiver.setSourceFile(downloadedFile.toFile());
+        archiver.setDestDirectory(tempDir);
+        archiver.extract();
+
+        File[] files = tempDir.listFiles();
+        if (files == null || files.length == 0) {
+            log.error("Failed to extract the MaxMind database");
+            System.exit(1);
+        }
+
+        // Search for the database file
+        for (File file : files) {
+            // The database is in a subdirectory
+            if (!file.isDirectory()) {
+                continue;
+            }
+
+            // Get the database file
+            File databaseFile = new File(file, "GeoLite2-City.mmdb");
+            if (!databaseFile.exists()) {
+                log.error("Failed to find the MaxMind database in the extracted files");
+                continue;
+            }
+            Files.copy(databaseFile.toPath(), database.toPath());
+        }
+
+        log.info("Downloaded and extracted the MaxMind database to '{}'", database.getAbsolutePath());
+        return database;
+    }
+}