Better HTML emails, smarter email digests, new email section in admin with digest preview

app/controllers/admin/email_controller.rb

@@ -0,0 +1,37 @@
+require_dependency 'email_renderer'
+
+class Admin::EmailController < Admin::AdminController
+
+  def index
+
+    # For now, just show the ActionMailer settings
+    mail_settings = { delivery_method: ActionMailer::Base.delivery_method }
+
+    mail_settings[:settings] = case mail_settings[:delivery_method]
+    when :smtp
+       ActionMailer::Base.smtp_settings.map {|k, v| {name: k, value: v}}
+    when :sendmail
+      ActionMailer::Base.sendmail_settings.map {|k, v| {name: k, value: v}}
+    end
+
+    render_json_dump(mail_settings)
+  end
+
+  def test
+    params.require(:email_address)
+    Jobs.enqueue(:test_email, to_address: params[:email_address])
+    render nothing: true
+  end
+
+  def logs
+    @email_logs = EmailLog.limit(50).includes(:user).order('created_at desc').all
+    render_serialized(@email_logs, EmailLogSerializer)
+  end
+
+  def preview_digest
+    params.require(:last_seen_at)
+    renderer = EmailRenderer.new(UserNotifications.digest(current_user, since: params[:last_seen_at]))
+    render json: MultiJson.dump(html_content: renderer.html, text_content: renderer.text)
+  end
+
+end