Merge branch 'add-email-subject-suffix' into 'master'

Add configurable email subject suffix

## Why was this MR needed?

I noticed that there is a commit 44ab156e 3 years ago which removes email subject prefix

actually we do need an special part of the email subject which makes the email subject easy to identify

we just need to make it configurable rather than remove it.

See merge request !6172

CHANGELOG

@@ -19,6 +19,7 @@ v 8.13.0 (unreleased)
   - Add word-wrap to issue title on issue and milestone boards (ClemMakesApps)
   - Fix robots.txt disallowing access to groups starting with "s" (Matt Harrison)
   - Close open merge request without source project (Katarzyna Kobierska Ula Budziszewska)
+  - Add configurable email subject suffix (Fu Xu)
   - Use a ConnectionPool for Rails.cache on Sidekiq servers
   - Replace `alias_method_chain` with `Module#prepend`
   - Enable GitLab Import/Export for non-admin users.

app/mailers/devise_mailer.rb

@@ -3,4 +3,12 @@ class DeviseMailer < Devise::Mailer
   default reply_to: Gitlab.config.gitlab.email_reply_to
 
   layout 'devise_mailer'
+
+  protected
+
+  def subject_for(key)
+    subject = super
+    subject << " | #{Gitlab.config.gitlab.email_subject_suffix}" if Gitlab.config.gitlab.email_subject_suffix.present?
+    subject
+  end
 end

app/mailers/emails/members.rb

@@ -45,7 +45,7 @@ module Emails
       @token = token
 
       mail(to: member.invite_email,
-           subject: "Invitation to join the #{member_source.human_name} #{member_source.model_name.singular}")
+           subject: subject("Invitation to join the #{member_source.human_name} #{member_source.model_name.singular}"))
     end
 
     def member_invite_accepted_email(member_source_type, member_id)

app/mailers/notify.rb

@@ -92,6 +92,7 @@ class Notify < BaseMailer
     subject = ""
     subject << "#{@project.name} | " if @project
     subject << extra.join(' | ') if extra.present?
+    subject << " | #{Gitlab.config.gitlab.email_subject_suffix}" if Gitlab.config.gitlab.email_subject_suffix.present?
     subject
   end
 

config/gitlab.yml.example

@@ -70,6 +70,7 @@ production: &base
     email_from: example@example.com
     email_display_name: GitLab
     email_reply_to: noreply@example.com
+    email_subject_suffix: ''
 
     # Email server smtp settings are in config/initializers/smtp_settings.rb.sample
 

config/initializers/1_settings.rb

@@ -186,6 +186,7 @@ Settings.gitlab['email_enabled'] ||= true if Settings.gitlab['email_enabled'].ni
 Settings.gitlab['email_from'] ||= ENV['GITLAB_EMAIL_FROM'] || "gitlab@#{Settings.gitlab.host}"
 Settings.gitlab['email_display_name'] ||= ENV['GITLAB_EMAIL_DISPLAY_NAME'] || 'GitLab'
 Settings.gitlab['email_reply_to'] ||= ENV['GITLAB_EMAIL_REPLY_TO'] || "noreply@#{Settings.gitlab.host}"
+Settings.gitlab['email_subject_suffix'] ||= ENV['GITLAB_EMAIL_SUBJECT_SUFFIX'] || ""
 Settings.gitlab['base_url']   ||= Settings.send(:build_base_gitlab_url)
 Settings.gitlab['url']        ||= Settings.send(:build_gitlab_url)
 Settings.gitlab['user']       ||= 'git'

doc/administration/environment_variables.md

@@ -20,6 +20,8 @@ Variable | Type | Description
 `GITLAB_EMAIL_FROM`           | string  | The e-mail address used in the "From" field in e-mails sent by GitLab
 `GITLAB_EMAIL_DISPLAY_NAME`   | string  | The name used in the "From" field in e-mails sent by GitLab
 `GITLAB_EMAIL_REPLY_TO`       | string  | The e-mail address used in the "Reply-To" field in e-mails sent by GitLab
+`GITLAB_EMAIL_REPLY_TO`       | string  | The e-mail address used in the "Reply-To" field in e-mails sent by GitLab
+`GITLAB_EMAIL_SUBJECT_SUFFIX` | string  | The e-mail subject suffix used in e-mails sent by GitLab
 `GITLAB_UNICORN_MEMORY_MIN`   | integer | The minimum memory threshold (in bytes) for the Unicorn worker killer
 `GITLAB_UNICORN_MEMORY_MAX`   | integer | The maximum memory threshold (in bytes) for the Unicorn worker killer
 

spec/mailers/notify_spec.rb

@@ -831,6 +831,7 @@ describe Notify do
     let(:user) { create(:user, email: 'old-email@mail.com') }
 
     before do
+      stub_config_setting(email_subject_suffix: 'A Nice Suffix')
       perform_enqueued_jobs do
         user.email = "new-email@mail.com"
         user.save
@@ -847,7 +848,7 @@ describe Notify do
     end
 
     it 'has the correct subject' do
-      is_expected.to have_subject "Confirmation instructions"
+      is_expected.to have_subject /^Confirmation instructions/
     end
 
     it 'includes a link to the site' do

spec/mailers/shared/notify.rb

@@ -37,6 +37,16 @@ shared_examples 'an email sent from GitLab' do
     reply_to = subject.header[:reply_to].addresses
     expect(reply_to).to eq([gitlab_sender_reply_to])
   end
+
+  context 'when custom suffix for email subject is set' do
+    before do
+      stub_config_setting(email_subject_suffix: 'A Nice Suffix')
+    end
+
+    it 'ends the subject with the suffix' do
+      is_expected.to have_subject /\ \| A Nice Suffix$/
+    end
+  end
 end
 
 shared_examples 'an email that contains a header with author username' do