gistfile1.rb

#!/usr/bin/env ruby

require 'dotenv'
require 'mail'

# Load environment variables from .env file
Dotenv.load

class FFM
  # Exit if there's nothing on STDIN
  exit(1) unless STDIN.fcntl(Fcntl::F_GETFL, 0) == 0

  # Create mail from STDIN
  mail = Mail.new(STDIN.read())

#   # Don't process email if "X-FFM: ignore" header exists
#   # as the email has already been through FFM
  if mail.header['X-FFM'].to_s == 'ignore'
      $stderr.puts "This email has already been processed"
      # Send the email to faxmaster?
      exit(1)
  end
  
  # Read From and To headers
  from = mail.from.first
  from_domain = from.split("@").last

  to = mail.to.first
  to_domain = to.split("@").last

  # Determine what type of email
  if from_domain == ENV['DOMAIN'] && to_domain == ENV['FAX_DOMAIN']
    # FAX SEND
  elsif from == ENV['FAX_SAAS_PROVIDER_NOTIFICATION_EMAIL']
    case mail.subject
    when "Fax Sent"
      # FAX SENT NOTIFICATION
      # tiff2pdf conversion
      # `tiff2pdf -o output.pdf input.tiff`
    when "Fax Failed"
      # FAX FAILED NOTIFICATION
    when "Fax Received" # regex_here
      # FAX RECEIVED NOTIFICATION
    else
      # Send the email to faxmaster?
    end
  else
    # Send the email to faxmaster?
  end
end

# Testing
require 'minitest/autorun'

class TestFFM < MiniTest::Unit::TestCase
  def setup
    @ffm = FFM.new
  end

  def test_that_mail_is_not_processed
  end
end