1 files changed, 45 insertions, 0 deletions
diff --git a/lib/gitlab/github_import/user_formatter.rb b/lib/gitlab/github_import/user_formatter.rb
new file mode 100644
index 00000000000..04c2964da20
--- /dev/null
+++ b/lib/gitlab/github_import/user_formatter.rb
@@ -0,0 +1,45 @@
+module Gitlab
+  module GithubImport
+    class UserFormatter
+      attr_reader :client, :raw
+
+      delegate :id, :login, to: :raw, allow_nil: true
+
+      def initialize(client, raw)
+        @client = client
+        @raw = raw
+      end
+
+      def gitlab_id
+        return @gitlab_id if defined?(@gitlab_id)
+
+        @gitlab_id = find_by_external_uid || find_by_email
+      end
+
+      private
+
+      def email
+        @email ||= client.user(raw.login).try(:email)
+      end
+
+      def find_by_email
+        return nil unless email
+
+        User.find_by_any_email(email)
+            .try(:id)
+      end
+
+      def find_by_external_uid
+        return nil unless id
+
+        identities = ::Identity.arel_table
+
+        User.select(:id)
+            .joins(:identities).where(identities[:provider].eq(:github)
+            .and(identities[:extern_uid].eq(id)))
+            .first
+            .try(:id)
+      end
+    end
+  end
+end