1 files changed, 32 insertions, 0 deletions
diff --git a/lib/gitlab/uuid.rb b/lib/gitlab/uuid.rb
new file mode 100644
index 00000000000..12a4efabc44
--- /dev/null
+++ b/lib/gitlab/uuid.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Gitlab
+  class UUID
+    NAMESPACE_IDS = {
+      development: "a143e9e2-41b3-47bc-9a19-081d089229f4",
+      test: "a143e9e2-41b3-47bc-9a19-081d089229f4",
+      staging: "a6930898-a1b2-4365-ab18-12aa474d9b26",
+      production: "58dc0f06-936c-43b3-93bb-71693f1b6570"
+    }.freeze
+
+    NAMESPACE_REGEX = /(\h{8})-(\h{4})-(\h{4})-(\h{4})-(\h{4})(\h{8})/.freeze
+    PACK_PATTERN = "NnnnnN".freeze
+
+    class << self
+      def v5(name, namespace_id: default_namespace_id)
+        Digest::UUID.uuid_v5(namespace_id, name)
+      end
+
+      private
+
+      def default_namespace_id
+        @default_namespace_id ||= begin
+          namespace_uuid = NAMESPACE_IDS.fetch(Rails.env.to_sym)
+          # Digest::UUID is broken when using a UUID as a namespace_id
+          # https://github.com/rails/rails/issues/37681#issue-520718028
+          namespace_uuid.scan(NAMESPACE_REGEX).flatten.map { |s| s.to_i(16) }.pack(PACK_PATTERN)
+        end
+      end
+    end
+  end
+end