Change prod emails from mailchimp to SES

.reek

@@ -15,6 +15,7 @@ DuplicateMethodCall:
 FeatureEnvy:
   exclude:
     - ActiveJob::Logging::LogSubscriber#json_for
+    - Aws::SES::Base#deliver
     - track_registration
     - append_info_to_payload
     - generate_slo_request

Gemfile.lock

@@ -248,7 +248,7 @@ GEM
     erubi (1.6.1)
     erubis (2.7.0)
     eventmachine (1.2.5)
-    excon (0.57.0)
+    excon (0.58.0)
     execjs (2.7.0)
     factory_girl (4.8.0)
       activesupport (>= 3.0.0)

config/application.yml.example

@@ -144,7 +144,7 @@ production:
   lockout_period_in_minutes: '10'
   logins_per_ip_limit: '20'
   logins_per_ip_period: '8'
-  mandrill_api_token: '123abc'
+  mandrill_api_token: '' # Empty string to switch to SES
   newrelic_license_key: 'xxx'
   newrelic_browser_key: ''
   newrelic_browser_app_id: ''

config/environments/production.rb

@@ -22,8 +22,10 @@
   config.action_mailer.default_options = { from: Figaro.env.email_from }
   config.action_mailer.delivery_method = if Figaro.env.disable_email_sending == 'true'
                                            :test
-                                         else
+                                         elsif Figaro.env.mandrill_api_token.present?
                                            :mandrill
+                                         else
+                                           :ses
                                          end
 
   routes.default_url_options[:protocol] = :https

config/initializers/ses_delivery_method.rb

@@ -0,0 +1,2 @@
+require Rails.root.join('lib', 'aws', 'ses.rb')
+ActionMailer::Base.add_delivery_method :ses, Aws::SES::Base

lib/aws/ses.rb

@@ -0,0 +1,24 @@
+##
+# ActionMailer delivery method for SES inspired by https://github.com/drewblas/aws-ses
+#
+module Aws
+  module SES
+    class Base
+      def initialize(*); end
+
+      def deliver(mail)
+        response = ses_client.send_raw_email(raw_message: { data: mail.to_s })
+        mail.message_id = "#{response.message_id}@email.amazonses.com"
+        response
+      end
+
+      alias deliver! deliver
+
+      private
+
+      def ses_client
+        @ses_client ||= Aws::SES::Client.new(region: Figaro.env.aws_region)
+      end
+    end
+  end
+end

spec/lib/aws/ses_spec.rb

@@ -0,0 +1,41 @@
+require 'rails_helper'
+
+describe Aws::SES::Base do
+  let(:mail) do
+    Mail.new(
+      to: 'asdf@example.com',
+      cc: 'ghjk@example.com',
+      body: 'asdf1234'
+    )
+  end
+  let(:ses_response) do
+    response = double
+    allow(response).to receive(:message_id).and_return('123abc')
+    response
+  end
+  let(:ses_client) { instance_double(Aws::SES::Client) }
+
+  before do
+    allow(ses_client).to receive(:send_raw_email).and_return(ses_response)
+    allow(Aws::SES::Client).to receive(:new).and_return(ses_client)
+  end
+
+  describe '#deliver!' do
+    it 'sends the message to the correct recipients' do
+      raw_mail_data = mail.to_s
+
+      subject.deliver!(mail)
+
+      expect(ses_client).to have_received(:send_raw_email).with(
+        raw_message: {
+          data: raw_mail_data,
+        }
+      )
+    end
+
+    it 'sets the message id on the mail argument' do
+      subject.deliver!(mail)
+      expect(mail.message_id).to eq('123abc@email.amazonses.com')
+    end
+  end
+end