Check if incoming emails and email key are available for service desk

app/models/ee/project.rb

@@ -36,8 +36,9 @@ module EE
     private
 
     def service_desk_available?
-      @service_desk_available ||=
-        EE::Gitlab::ServiceDesk.enabled? && service_desk_enabled?
+      return @service_desk_available if defined?(@service_desk_available)
+
+      @service_desk_available = EE::Gitlab::ServiceDesk.enabled? && service_desk_enabled?
     end
   end
 end

changelogs/unreleased-ee/issue_2160.yml

+---
+title: Check if incoming emails and email key are available for service desk
+merge_request:
+author:

lib/ee/gitlab/service_desk.rb

@@ -2,7 +2,10 @@ module EE
   module Gitlab
     module ServiceDesk
       def self.enabled?
-        ::License.current && ::License.current.add_on?('GitLab_ServiceDesk')
+        ::License.current &&
+          ::License.current.add_on?('GitLab_ServiceDesk') &&
+          ::Gitlab::IncomingEmail.enabled? &&
+          ::Gitlab::IncomingEmail.supports_wildcard?
       end
     end
   end

spec/controllers/projects/service_desk_controller_spec.rb

@@ -7,6 +7,8 @@ describe Projects::ServiceDeskController do
   before do
     allow_any_instance_of(License).to receive(:add_on?).and_call_original
     allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk') { true }
+    allow(Gitlab::IncomingEmail).to receive(:enabled?) { true }
+    allow(Gitlab::IncomingEmail).to receive(:supports_wildcard?) { true }
     project.update(service_desk_enabled: true)
     project.add_master(user)
     sign_in(user)

spec/features/projects/settings/ee/service_desk_setting_spec.rb

@@ -11,6 +11,8 @@ describe 'Service Desk Setting', js: true, feature: true do
     login_as(user)
     allow_any_instance_of(License).to receive(:add_on?).and_call_original
     allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk') { true }
+    allow(::Gitlab::IncomingEmail).to receive(:enabled?) { true }
+    allow(::Gitlab::IncomingEmail).to receive(:supports_wildcard?) { true }
 
     visit edit_namespace_project_path(project.namespace, project)
   end

spec/lib/ee/gitlab/service_desk_spec.rb

+require 'spec_helper'
+
+describe EE::Gitlab::ServiceDesk, lib: true do
+  before do
+    allow_any_instance_of(License).to receive(:add_on?).and_call_original
+    allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk') { true }
+    allow(::Gitlab::IncomingEmail).to receive(:enabled?) { true }
+    allow(::Gitlab::IncomingEmail).to receive(:supports_wildcard?) { true }
+  end
+
+  subject { described_class.enabled? }
+
+  it { is_expected.to be_truthy }
+
+  context 'when license does not support service desk' do
+    before do
+      allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk') { false }
+    end
+
+    it { is_expected.to be_falsy }
+  end
+
+  context 'when incoming emails are disabled' do
+    before do
+      allow(::Gitlab::IncomingEmail).to receive(:enabled?) { false }
+    end
+
+    it { is_expected.to be_falsy }
+  end
+
+  context 'when email key is not supported' do
+    before do
+      allow(::Gitlab::IncomingEmail).to receive(:supports_wildcard?) { false }
+    end
+
+    it { is_expected.to be_falsy }
+  end
+end

spec/lib/gitlab/email/handler/service_desk_handler_spec.rb

@@ -21,6 +21,8 @@ describe Gitlab::Email::Handler::EE::ServiceDeskHandler do
 
       allow_any_instance_of(License).to receive(:add_on?).and_call_original
       allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk') { true }
+      allow(::Gitlab::IncomingEmail).to receive(:enabled?) { true }
+      allow(::Gitlab::IncomingEmail).to receive(:supports_wildcard?) { true }
     end
 
     it 'sends thank you the email and creates issue' do

spec/services/ee/notification_service_spec.rb

@@ -9,6 +9,8 @@ describe EE::NotificationService do
 
     allow_any_instance_of(License).to receive(:add_on?).and_call_original
     allow_any_instance_of(License).to receive(:add_on?).with('GitLab_ServiceDesk') { true }
+    allow(::Gitlab::IncomingEmail).to receive(:enabled?) { true }
+    allow(::Gitlab::IncomingEmail).to receive(:supports_wildcard?) { true }
   end
 
   def should_email!