⚙️ Add luet repo add/get

Fix #230

pkg/helpers/uri.go

@@ -0,0 +1,62 @@
+// Copyright © 2022 Ettore Di Giacinto <mudler@gentoo.org>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, see <http://www.gnu.org/licenses/>.
+
+package helpers
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+func IsUrl(s string) bool {
+	url, err := url.Parse(s)
+	if err != nil || url.Scheme == "" {
+		return false
+	}
+	return true
+}
+
+func GetURI(s string) (string, error) {
+	f, err := os.Stat(s)
+
+	switch {
+	case err == nil && f.IsDir():
+		return "", errors.New("directories not supported")
+	case err == nil:
+		b, err := ioutil.ReadFile(s)
+		return string(b), err
+	case IsUrl(s):
+		resp, err := http.Get(s)
+		if err != nil {
+			return "", err
+		}
+		defer resp.Body.Close()
+
+		buf := bytes.NewBuffer([]byte{})
+		_, err = io.Copy(buf, resp.Body)
+		if err != nil {
+			return "", err
+		}
+		return buf.String(), nil
+	default:
+		return "", errors.New("not supported")
+	}
+}