feat: Adding add/remove tag on the backend side

Signed-off-by: Vincent Boutour <[email protected]>

pkg/provider/metadata.go

@@ -46,6 +46,24 @@ func ReplaceDescription(description string) MetadataAction {
 	}
 }
 
+func AddTag(tag string) MetadataAction {
+	return func(instance Metadata) Metadata {
+		instance.Tags = append(instance.Tags, tag)
+
+		return instance
+	}
+}
+
+func RemoveTag(tag string) MetadataAction {
+	return func(instance Metadata) Metadata {
+		if index := findIndex(instance.Tags, tag); index != -1 {
+			instance.Tags = append(instance.Tags[:index], instance.Tags[index+1:]...)
+		}
+
+		return instance
+	}
+}
+
 type MetadataManager interface {
 	ListDir(ctx context.Context, item absto.Item) ([]absto.Item, error)
 

pkg/provider/utils.go → pkg/provider/util.go

@@ -265,3 +265,13 @@ func EtagMatch(w http.ResponseWriter, r *http.Request, hash string) (etag string
 
 	return
 }
+
+func findIndex(arr []string, value string) int {
+	for index, item := range arr {
+		if item == value {
+			return index
+		}
+	}
+
+	return -1
+}