Created the VersionInstaller.java

src/main/java/de/gnmyt/mcdash/api/installer/VersionInstaller.java

@@ -0,0 +1,57 @@
+package de.gnmyt.mcdash.api.installer;
+
+import de.gnmyt.mcdash.api.Logger;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import org.apache.commons.io.FileUtils;
+
+import java.io.File;
+
+public interface VersionInstaller {
+
+    Logger LOG = new Logger(VersionInstaller.class);
+    OkHttpClient client = new OkHttpClient();
+
+    /**
+     * Installs a specific version of the minecraft server software
+     *
+     * @param software the software
+     * @param version  the version
+     * @return <code>true</code> if the installation was successful
+     */
+    boolean installVersion(String software, String version);
+
+    /**
+     * Downloads a file from a specific url and saves it to a specific file
+     *
+     * @param url  the url of the file
+     * @param file the file where the file should be saved
+     * @return <code>true</code> if the download was successful
+     */
+    default boolean downloadFile(String url, File file) {
+        try {
+            Request request = new Request.Builder().url(url).build();
+            Response response = client.newCall(request).execute();
+
+            if (response.code() == 200) {
+                FileUtils.copyToFile(response.body().byteStream(), file);
+
+                if (file.length() < 2000000) {
+                    LOG.error("The file " + file.getName() + " is too small. It may be corrupted.");
+                    file.delete();
+                    return false;
+                }
+
+                return true;
+            }
+
+            response.close();
+        } catch (Exception e) {
+            LOG.error("An error occurred while downloading the file", e);
+        }
+
+        return false;
+    }
+
+}