Add email notification on group export complete

- When Group Export via UI is complete send
  exporter user a notification email with either
  success or failure about the export

app/controllers/groups_controller.rb

@@ -146,7 +146,7 @@ class GroupsController < Groups::ApplicationController
     export_service = Groups::ImportExport::ExportService.new(group: @group, user: current_user)
 
     if export_service.async_execute
-      redirect_to edit_group_path(@group), notice: _('Group export started.')
+      redirect_to edit_group_path(@group), notice: _('Group export started. A download link will be sent by email.')
     else
       redirect_to edit_group_path(@group), alert: _('Group export could not be started.')
     end

app/mailers/emails/groups.rb

+# frozen_string_literal: true
+
+module Emails
+  module Groups
+    def group_was_exported_email(current_user, group)
+      group_email(current_user, group, _('Group was exported'))
+    end
+
+    def group_was_not_exported_email(current_user, group, errors)
+      group_email(current_user, group, _('Group export error'), errors: errors)
+    end
+
+    def group_email(current_user, group, subj, errors: nil)
+      @group = group
+      @errors = errors
+      mail(to: current_user.notification_email_for(@group), subject: subject(subj))
+    end
+  end
+end

app/mailers/notify.rb

@@ -17,6 +17,7 @@ class Notify < ApplicationMailer
   include Emails::AutoDevops
   include Emails::RemoteMirrors
   include Emails::Releases
+  include Emails::Groups
 
   helper MilestonesHelper
   helper MergeRequestsHelper

app/services/groups/import_export/export_service.rb

@@ -92,6 +92,8 @@ module Groups
           group_name: @group.name,
           message:    'Group Import/Export: Export succeeded'
         )
+
+        notification_service.group_was_exported(@group, @current_user)
       end
 
       def notify_error
@@ -101,6 +103,12 @@ module Groups
           error:      @shared.errors.join(', '),
           message:    'Group Import/Export: Export failed'
         )
+
+        notification_service.group_was_not_exported(@group, @current_user, @shared.errors)
+      end
+
+      def notification_service
+        @notification_service ||= NotificationService.new
       end
     end
   end

app/services/notification_service.rb

@@ -537,6 +537,18 @@ class NotificationService
     end
   end
 
+  def group_was_exported(group, current_user)
+    return true unless notifiable?(current_user, :mention, group: group)
+
+    mailer.group_was_exported_email(current_user, group).deliver_later
+  end
+
+  def group_was_not_exported(group, current_user, errors)
+    return true unless notifiable?(current_user, :mention, group: group)
+
+    mailer.group_was_not_exported_email(current_user, group, errors).deliver_later
+  end
+
   protected
 
   def new_resource_email(target, method)

app/views/groups/settings/_export.html.haml

@@ -17,7 +17,7 @@
         %li= _('Projects')
         %li= _('Runner tokens')
         %li= _('SAML discovery tokens')
-  %p= _('Once the exported file is ready you can download it from this page.')
+  %p= _('Once the exported file is ready, you will receive a notification email with a download link, or you can download it from this page.')
   - if group.export_file_exists?
     = link_to _('Regenerate export'), export_group_path(group),
         method: :post, class: 'btn btn-default', data: { qa_selector: 'regenerate_export_group_link' }

app/views/notify/group_was_exported_email.html.haml

+%p
+  = _('Group %{group_name} was exported successfully.') % { group_name: @group.name }
+
+%p
+  = _('The group export can be downloaded from:')
+  = link_to download_export_group_url(@group), rel: 'nofollow', download: '' do
+    #{@group.full_name} export
+%p
+  = _('The download link will expire in 24 hours.')

app/views/notify/group_was_exported_email.text.erb

+<%= _('Group %{group_name} was exported successfully.') % { group_name: @group.name } %>
+
+<%= _('The group export can be downloaded from:') %>
+<%= download_export_group_url(@group) %>
+
+<%= _('The download link will expire in 24 hours.') %>

app/views/notify/group_was_not_exported_email.html.haml

+%p
+  = _("Group %{group_name} couldn't be exported.") % { group_name: @group.name }
+
+%p
+  = _('The errors we encountered were:')
+
+  %ul
+  - @errors.each do |error|
+    %li
+      #{error}

app/views/notify/group_was_not_exported_email.text.erb

+<%= _("Group %{group_name} couldn't be exported.") % { group_name: @group.name } %>
+
+<%= _('The errors we encountered were:') %>
+
+<% @errors.each do |error| -%>
+  - <%= error %>
+<% end -%>

changelogs/unreleased/georgekoltsov-add-group-export-email-nofitication.yml

+---
+title: Add email notification on group export complete
+merge_request: 30522
+author:
+type: added

doc/user/group/settings/import_export.md

@@ -63,8 +63,11 @@ For more details on the specific data persisted in a group export, see the
 
    ![Export group panel](img/export_panel.png)
 
-1. Once the export is generated, you can click **Download export** to download the [exported contents](#exported-contents)
-in a compressed tar archive, with contents in JSON format. You can also return to this page to regenerate the export data.
+1. Once the export is generated, you should receive an e-mail with a link to the [exported contents](#exported-contents)
+   in a compressed tar archive, with contents in JSON format.
+
+1. Alternatively, you can come back to the project settings and download the
+   file from there by clicking **Download export**, or generate a new file by clicking **Regenerate export**.
 
 ## Rate Limits
 

locale/gitlab.pot

@@ -10424,6 +10424,12 @@ msgstr ""
 msgid "Group"
 msgstr ""
 
+msgid "Group %{group_name} couldn't be exported."
+msgstr ""
+
+msgid "Group %{group_name} was exported successfully."
+msgstr ""
+
 msgid "Group %{group_name} was scheduled for deletion."
 msgstr ""
 
@@ -10475,10 +10481,13 @@ msgstr ""
 msgid "Group export could not be started."
 msgstr ""
 
+msgid "Group export error"
+msgstr ""
+
 msgid "Group export link has expired. Please generate a new export from your group settings."
 msgstr ""
 
-msgid "Group export started."
+msgid "Group export started. A download link will be sent by email."
 msgstr ""
 
 msgid "Group has been already marked for deletion"
@@ -10523,6 +10532,9 @@ msgstr ""
 msgid "Group variables (inherited)"
 msgstr ""
 
+msgid "Group was exported"
+msgstr ""
+
 msgid "Group was successfully updated."
 msgstr ""
 
@@ -14390,9 +14402,6 @@ msgstr ""
 msgid "Once removed, the fork relationship cannot be restored and you will no longer be able to send merge requests to the source."
 msgstr ""
 
-msgid "Once the exported file is ready you can download it from this page."
-msgstr ""
-
 msgid "Once the exported file is ready, you will receive a notification email with a download link, or you can download it from this page."
 msgstr ""
 
@@ -20889,9 +20898,15 @@ msgstr ""
 msgid "The domain you entered is not allowed."
 msgstr ""
 
+msgid "The download link will expire in 24 hours."
+msgstr ""
+
 msgid "The entered user map is not a valid JSON user map."
 msgstr ""
 
+msgid "The errors we encountered were:"
+msgstr ""
+
 msgid "The file has been successfully created."
 msgstr ""
 
@@ -20930,6 +20945,9 @@ msgstr ""
 msgid "The group can be fully restored"
 msgstr ""
 
+msgid "The group export can be downloaded from:"
+msgstr ""
+
 msgid "The group has already been shared with this group"
 msgstr ""
 

spec/mailers/emails/groups_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'email_spec'
+
+describe Emails::Groups do
+  include EmailSpec::Matchers
+
+  let(:group) { create(:group) }
+  let(:user) { create(:user) }
+
+  before do
+    group.add_owner(user)
+  end
+
+  describe '#group_was_exported_email' do
+    subject { Notify.group_was_exported_email(user, group) }
+
+    it 'sends success email' do
+      expect(subject).to have_subject "#{group.name} | Group was exported"
+      expect(subject).to have_body_text 'The download link will expire in 24 hours.'
+      expect(subject).to have_body_text "groups/#{group.path}/-/download_export"
+    end
+  end
+
+  describe '#group_was_not_exported_email' do
+    let(:shared) { Gitlab::ImportExport::Shared.new(group) }
+    let(:error) { Gitlab::ImportExport::Error.new('Error!') }
+
+    before do
+      shared.error(error)
+    end
+
+    subject { Notify.group_was_not_exported_email(user, group, shared.errors) }
+
+    it 'sends failure email' do
+      expect(subject).to have_subject "#{group.name} | Group export error"
+      expect(subject).to have_body_text "Group #{group.name} couldn't be exported."
+    end
+  end
+end

spec/services/groups/import_export/export_service_spec.rb

@@ -65,6 +65,14 @@ describe Groups::ImportExport::ExportService do
       service.execute
     end
 
+    it 'notifies the user' do
+      expect_next_instance_of(NotificationService) do |instance|
+        expect(instance).to receive(:group_was_exported)
+      end
+
+      service.execute
+    end
+
     context 'when saver succeeds' do
       it 'saves the group in the file system' do
         service.execute
@@ -108,16 +116,26 @@ describe Groups::ImportExport::ExportService do
 
     context 'when export fails' do
       context 'when file saver fails' do
-        it 'removes the remaining exported data' do
+        before do
           allow_next_instance_of(Gitlab::ImportExport::Saver) do |saver|
             allow(saver).to receive(:save).and_return(false)
           end
+        end
 
+        it 'removes the remaining exported data' do
           expect { service.execute }.to raise_error(Gitlab::ImportExport::Error)
 
           expect(group.import_export_upload).to be_nil
           expect(File.exist?(shared.archive_path)).to eq(false)
         end
+
+        it 'notifies the user about failed group export' do
+          expect_next_instance_of(NotificationService) do |instance|
+            expect(instance).to receive(:group_was_not_exported)
+          end
+
+          expect { service.execute }.to raise_error(Gitlab::ImportExport::Error)
+        end
       end
 
       context 'when file compression fails' do