1 files changed, 92 insertions, 0 deletions
diff --git a/app/mailers/emails/service_desk.rb b/app/mailers/emails/service_desk.rb
new file mode 100644
index 00000000000..29fe608472d
--- /dev/null
+++ b/app/mailers/emails/service_desk.rb
@@ -0,0 +1,92 @@
+# frozen_string_literal: true
+
+module Emails
+  module ServiceDesk
+    extend ActiveSupport::Concern
+    include MarkupHelper
+
+    included do
+      layout 'service_desk', only: [:service_desk_thank_you_email, :service_desk_new_note_email]
+    end
+
+    def service_desk_thank_you_email(issue_id)
+      setup_service_desk_mail(issue_id)
+
+      email_sender = sender(
+        @support_bot.id,
+        send_from_user_email: false,
+        sender_name: @project.service_desk_setting&.outgoing_name
+      )
+      options = service_desk_options(email_sender, 'thank_you')
+                  .merge(subject: "Re: #{subject_base}")
+
+      mail_new_thread(@issue, options)
+    end
+
+    def service_desk_new_note_email(issue_id, note_id)
+      @note = Note.find(note_id)
+      setup_service_desk_mail(issue_id)
+
+      email_sender = sender(@note.author_id)
+      options = service_desk_options(email_sender, 'new_note')
+                  .merge(subject: subject_base)
+
+      mail_answer_thread(@issue, options)
+    end
+
+    private
+
+    def setup_service_desk_mail(issue_id)
+      @issue = Issue.find(issue_id)
+      @project = @issue.project
+      @support_bot = User.support_bot
+
+      @sent_notification = SentNotification.record(@issue, @support_bot.id, reply_key)
+    end
+
+    def service_desk_options(email_sender, email_type)
+      {
+        from: email_sender,
+        to: @issue.service_desk_reply_to
+      }.tap do |options|
+        next unless template_body = template_content(email_type)
+
+        options[:body] = template_body
+        options[:content_type] = 'text/html'
+      end
+    end
+
+    def template_content(email_type)
+      template = Gitlab::Template::ServiceDeskTemplate.find(email_type, @project)
+
+      text = substitute_template_replacements(template.content)
+
+      markdown(text, project: @project)
+    rescue Gitlab::Template::Finders::RepoTemplateFinder::FileNotFoundError
+      nil
+    end
+
+    def substitute_template_replacements(template_body)
+      template_body
+        .gsub(/%\{\s*ISSUE_ID\s*\}/, issue_id)
+        .gsub(/%\{\s*ISSUE_PATH\s*\}/, issue_path)
+        .gsub(/%\{\s*NOTE_TEXT\s*\}/, note_text)
+    end
+
+    def issue_id
+      "#{Issue.reference_prefix}#{@issue.iid}"
+    end
+
+    def issue_path
+      @issue.to_reference(full: true)
+    end
+
+    def note_text
+      @note&.note.to_s
+    end
+
+    def subject_base
+      "#{@issue.title} (##{@issue.iid})"
+    end
+  end
+end