1 files changed, 19 insertions, 1 deletions
diff --git a/objectstore/objecstore.go b/objectstore/objecstore.go
index 7509fad..f4985c9 100644
--- a/objectstore/objecstore.go
+++ b/objectstore/objecstore.go
@@ -4,8 +4,26 @@
 // https://creativecommons.org/publicdomain/zero/1.0/legalcode
 package objectstore
 
+import (
+	"fmt"
+)
+
 type ObjectStore interface {
-	CreateObject(bucketId string, objectId string, content string)
+	CreateObject(bucketId string, objectId string, content string) error
 	GetObject(bucketId string, objectId string) (string, error)
 	DeleteObject(bucketId string, objectId string) error
 }
+
+type DuplicateError struct {
+	ObjectId string
+}
+
+func (e *DuplicateError) Error() string {
+	return fmt.Sprintf("Duplicate of the '%v' object", e.ObjectId)
+}
+
+func NewDuplicateError(objectId string) error {
+	return &DuplicateError{
+		ObjectId: objectId,
+	}
+}