Download mods and headless server

till working on improvements to code this more like
a savepoint.

utils.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+//Utilities
+
+func download(filedest string, url string) error {
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	out, err := os.Create(filedest)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, resp.Body)
+	return err
+}
+
+func unzip(src, dest string) ([]string, error) {
+
+	//store file names available in a array of strings
+	var filenames []string
+
+	r, err := zip.OpenReader(src)
+	if err != nil {
+		return filenames, err
+	}
+
+	defer r.Close()
+
+	for _, f := range r.File {
+		// Skip folders to prevent permission issues
+		if strings.Contains(f.Name, "__MACOSX") {
+			continue
+		}
+
+		fpath := filepath.Join(dest, f.Name)
+
+		// Checking for any invalid file paths
+		if !strings.HasPrefix(fpath, filepath.Clean(dest)+string(os.PathSeparator)) {
+			return filenames, fmt.Errorf("%s is an illegal filepath", fpath)
+		}
+
+		filenames = append(filenames, fpath)
+
+		if f.FileInfo().IsDir() {
+			os.MkdirAll(fpath, os.ModePerm)
+			continue
+		}
+
+		// Creating the files in the target directory
+		if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
+			return filenames, err
+		}
+
+		outFile, err := os.OpenFile(fpath,
+			os.O_WRONLY|os.O_CREATE|os.O_TRUNC,
+			f.Mode())
+
+		if err != nil {
+			return filenames, err
+		}
+
+		rc, err := f.Open()
+
+		if err != nil {
+			return filenames, err
+		}
+
+		_, err = io.Copy(outFile, rc)
+
+		outFile.Close()
+		rc.Close()
+		if err != nil {
+			return filenames, err
+		}
+	}
+
+	return filenames, nil
+}