feat(migration): migration from other services now happens in the background

pkg/modules/migration/handler/notifications.go

@@ -0,0 +1,51 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-present Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public Licensee as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public Licensee for more details.
+//
+// You should have received a copy of the GNU Affero General Public Licensee
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package handler
+
+import (
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
+
+	"code.vikunja.io/api/pkg/config"
+	"code.vikunja.io/api/pkg/notifications"
+)
+
+// MigrationDoneNotification represents a MigrationDoneNotification notification
+type MigrationDoneNotification struct {
+	MigratorName string
+}
+
+// ToMail returns the mail notification for MigrationDoneNotification
+func (n *MigrationDoneNotification) ToMail() *notifications.Mail {
+	kind := cases.Title(language.English).String(n.MigratorName)
+
+	return notifications.NewMail().
+		Subject("The migration from "+kind+" to Vikunja was completed").
+		Line("Vikunja has imported all lists/projects, tasks, notes, reminders and files from "+kind+" you have access to.").
+		Action("View your imported projects in Vikunja", config.ServiceFrontendurl.GetString()).
+		Line("Have fun with your new (old) projects!")
+}
+
+// ToDB returns the MigrationDoneNotification notification in a format which can be saved in the db
+func (n *MigrationDoneNotification) ToDB() interface{} {
+	return nil
+}
+
+// Name returns the name of the notification
+func (n *MigrationDoneNotification) Name() string {
+	return "migration.done"
+}