relaying email from Postfix to a Rails application, using normal HTTP API endpoints

aliases

doorkeeper_contact:       |"/srv/doorkeeper/current/script/email_handler contact_emails production"
doorkeeper_event_signup:  |"/srv/doorkeeper/current/script/email_handler signup_emails production"
doorkeeper_bounce:        |"/srv/doorkeeper/current/script/email_handler bounced_emails production"

bounced_emails_controller.rb

class Api::Private::BouncedEmailsController < Api::BaseController
  def create
    BounceMailer.receive(params[:email])
    head :created
  end
end

email_handler

#!/bin/bash

if [ "$2" == "production" ]; then
  base_url="http://api.doorkeeper.jp"
elif [ "$2" == "development" ]; then
  base_url="http://api.checkin.dev"
else
  echo "4.3.5 configuration error"
  exit 1
fi

/usr/bin/curl -F email='<-' -s -f $base_url/private/$1
rc=$?

if [ $rc != 0 ] ; then
  echo "4.3.2 couldn't deliver message to API endpoint, code $rc"
  exit 1
fi

exit 0