iso2022jp_enforcer.rb

# -*- coding: utf-8 -*-
module Iso2022jpEnforcer
  extend ActiveSupport::Concern

  included do
    default :charset => 'iso-2022-jp'
    alias_method_chain :mail, :iso_2022_jp
  end

  module ClassMethods
    # taken from http://wiki.fdiary.net/rails/?ActionMailer
    def base64(text, charset="iso-2022-jp", convert=true)
      if convert
        if charset == "iso-2022-jp"
          text = NKF.nkf('-j -m0', text)
        end
      end
      text = [text].pack('m').delete("\r\n")
      "=?#{charset}?B?#{text}?="
    end
  end

  module InstanceMethods
    def mail_with_iso_2022_jp(headers, &block)
      mail = mail_without_iso_2022_jp(headers, &block)
      mail.subject = base64(mail.subject)
      mail.body.charset = 'iso-2022-jp'
      mail.body.encoding = '7bit'
      mail.body = NKF::nkf('-j', mail.body.to_s)
      mail
    end

    private
    def base64(text, charset="iso-2022-jp", convert=true)
      self.class.base64(text, charset, convert)
    end
  end
end