Moving gateway and storage driver to packages

pkgs/storage/file_storage.go

@@ -0,0 +1,22 @@
+package storage
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+)
+
+type FileStorage struct {
+	RootDir string
+}
+
+func (storage FileStorage) Get(objectPath string) ([]byte, error) {
+	return ioutil.ReadFile(path.Join(storage.RootDir, objectPath))
+
+}
+
+func (storage FileStorage) Put(objectPath string, object []byte) error {
+	os.MkdirAll(filepath.Dir(path.Join(storage.RootDir, objectPath)), 0700)
+	return ioutil.WriteFile(path.Join(storage.RootDir, objectPath), object, 0600)
+}