Merge branch 'disable_email_option' into 'master'

Disable email option

Fixes #1569

See merge request !1222

config/gitlab.yml.example

@@ -39,6 +39,8 @@ production: &base
     # time_zone: 'UTC'
 
     ## Email settings
+    # Uncomment and set to false if you need to disable email sending from GitLab (default: true)
+    # email_enabled: true
     # Email address used in the "From" field in mails sent by GitLab
     email_from: example@example.com
 

config/initializers/1_settings.rb

@@ -95,6 +95,7 @@ Settings.gitlab['https']        = false if Settings.gitlab['https'].nil?
 Settings.gitlab['port']       ||= Settings.gitlab.https ? 443 : 80
 Settings.gitlab['relative_url_root'] ||= ENV['RAILS_RELATIVE_URL_ROOT'] || ''
 Settings.gitlab['protocol']   ||= Settings.gitlab.https ? "https" : "http"
+Settings.gitlab['email_enabled'] ||= true if Settings.gitlab['email_enabled'].nil?
 Settings.gitlab['email_from'] ||= "gitlab@#{Settings.gitlab.host}"
 Settings.gitlab['url']        ||= Settings.send(:build_gitlab_url)
 Settings.gitlab['user']       ||= 'git'

config/initializers/disable_email_interceptor.rb

+# Interceptor in lib/disable_email_interceptor.rb
+ActionMailer::Base.register_interceptor(DisableEmailInterceptor) unless Gitlab.config.gitlab.email_enabled

lib/disable_email_interceptor.rb

+# Read about interceptors in http://guides.rubyonrails.org/action_mailer_basics.html#intercepting-emails
+class DisableEmailInterceptor
+
+  def self.delivering_email(message)
+    message.perform_deliveries = false
+    Rails.logger.info "Emails disabled! Interceptor prevented sending mail #{message.subject}"
+  end
+end

spec/lib/disable_email_interceptor_spec.rb

+require 'spec_helper'
+
+describe DisableEmailInterceptor do
+  before do
+    ActionMailer::Base.register_interceptor(DisableEmailInterceptor)
+  end
+
+  it 'should not send emails' do
+    Gitlab.config.gitlab.stub(:email_enabled).and_return(false)
+    expect {
+      deliver_mail
+    }.not_to change(ActionMailer::Base.deliveries, :count)
+  end
+
+  after do
+    # Removing interceptor from the list because unregister_interceptor is
+    # implemented in later version of mail gem
+    # See: https://github.com/mikel/mail/pull/705
+    Mail.class_variable_set(:@@delivery_interceptors, [])
+  end
+
+  def deliver_mail
+    key = create :personal_key
+    Notify.new_ssh_key_email(key.id)
+  end
+end