1 files changed, 39 insertions, 0 deletions
diff --git a/lib/gitlab/import/user_from_mention.rb b/lib/gitlab/import/user_from_mention.rb
new file mode 100644
index 00000000000..9e3489f91b4
--- /dev/null
+++ b/lib/gitlab/import/user_from_mention.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Import
+    module UserFromMention
+      SOURCE_USER_CACHE_KEY = '%s/project/%s/source/username/%s'
+
+      def user_from_cache(mention)
+        cached_email = read(mention)
+
+        return unless cached_email
+
+        find_user(cached_email)
+      end
+
+      def cache_multiple(hash)
+        ::Gitlab::Cache::Import::Caching.write_multiple(hash, timeout: timeout)
+      end
+
+      def source_user_cache_key(importer, project_id, username)
+        format(SOURCE_USER_CACHE_KEY, importer, project_id, username)
+      end
+
+      private
+
+      def read(mention)
+        ::Gitlab::Cache::Import::Caching.read(source_user_cache_key(importer, project_id, mention))
+      end
+
+      def find_user(email)
+        User.find_by_any_email(email, confirmed: true)
+      end
+
+      def timeout
+        ::Gitlab::Cache::Import::Caching::LONGER_TIMEOUT
+      end
+    end
+  end
+end