add utils pkg for dealing with spaces ids

pkg/spaces/utils/utils.go

@@ -0,0 +1,47 @@
+package utils
+
+import (
+	"encoding/base32"
+	"fmt"
+	"strings"
+
+	provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
+)
+
+func DecodeSpaceID(raw string) (storageID, path string, ok bool) {
+	// The input is expected to be in the form of <storage_id>$<base32(<path>)
+	s := strings.SplitN(raw, "$", 2)
+	if len(s) != 2 {
+		return
+	}
+
+	storageID = s[0]
+	encodedPath := s[1]
+	p, err := base32.StdEncoding.DecodeString(encodedPath)
+	if err != nil {
+		return
+	}
+
+	path = string(p)
+	ok = true
+	return
+}
+
+func DecodeResourceID(raw string) (storageID, path, itemID string, ok bool) {
+	// The input is expected to be in the form of <storage_id>$<base32(<path>)!<item_id>
+	s := strings.SplitN(raw, "!", 2)
+	if len(s) != 2 {
+		return
+	}
+	itemID = s[1]
+	storageID, path, ok = DecodeSpaceID(s[0])
+	return
+}
+
+func EncodeResourceID(r *provider.ResourceId) string {
+	return fmt.Sprintf("%s$%s!%s", r.StorageId, r.SpaceId, r.OpaqueId)
+}
+
+func EncodeSpaceID(path string) string {
+	return base32.StdEncoding.EncodeToString([]byte(path))
+}