1 files changed, 34 insertions, 0 deletions
diff --git a/app/services/packages/npm/create_tag_service.rb b/app/services/packages/npm/create_tag_service.rb
new file mode 100644
index 00000000000..82974d0ca4b
--- /dev/null
+++ b/app/services/packages/npm/create_tag_service.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+module Packages
+  module Npm
+    class CreateTagService
+      include Gitlab::Utils::StrongMemoize
+
+      attr_reader :package, :tag_name
+
+      def initialize(package, tag_name)
+        @package = package
+        @tag_name = tag_name
+      end
+
+      def execute
+        if existing_tag.present?
+          existing_tag.update_column(:package_id, package.id)
+          existing_tag
+        else
+          package.tags.create!(name: tag_name)
+        end
+      end
+
+      private
+
+      def existing_tag
+        strong_memoize(:existing_tag) do
+          Packages::TagsFinder
+            .new(package.project, package.name, package_type: package.package_type)
+            .find_by_name(tag_name)
+        end
+      end
+    end
+  end
+end