Module: Sisimai::Lhost::Mimecast

Defined in:
lib/sisimai/lhost/mimecast.rb

Overview

Sisimai::Lhost::Mimecast decodes a bounce email which created by Mimecast www.mimecast.com/. Methods in the module are called from only Sisimai::Message.

Constant Summary collapse

Indicators = 
Sisimai::Lhost.INDICATORS
Boundaries =

No such line in lhost-mimecast-*

['Content-Type: message/rfc822'].freeze
StartingOf = 
{message: ['-- ']}.freeze

Class Method Summary collapse

Class Method Details

.description ⇒ Object 



100
 
# File 'lib/sisimai/lhost/mimecast.rb', line 100

def description; return 'Mimecast'; end

.inquire(mhead, mbody) ⇒ Hash, Nil

This method is abstract.

Decodes the bounce message from Mimecast

Parameters:

  • mhead (Hash) —

    Message headers of a bounce email

  • mbody (String) —

    Message body of a bounce email

Returns:

  • (Hash) —

    Bounce data list and message/rfc822 part

  • (Nil) —

    it failed to decode or the arguments are missing



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# File 'lib/sisimai/lhost/mimecast.rb', line 17

def inquire(mhead, mbody)
  match  = 0
  match += 1 if mhead['subject'].include?('Email Delivery Failure')
  if mhead['message-id']
    # Message-Id: <0123456789-1102117314000@us-mta-25.us.mimecast.lan>
    match += 1 if mhead['message-id'].include?('.mimecast.lan>')
  end
  return nil if match == 0

  require 'sisimai/rfc1123'
  require 'sisimai/rfc1894'
  fieldtable = Sisimai::RFC1894.FIELDTABLE
  permessage = {}     # (Hash) Store values of each Per-Message field

  dscontents = [Sisimai::Lhost.DELIVERYSTATUS]; v = nil
  emailparts = Sisimai::RFC5322.part(mbody, Boundaries)
  bodyslices = emailparts[0].split("\n")
  readcursor = 0      # (Integer) Points the current cursor position
  recipients = 0      # (Integer) The number of 'Final-Recipient' header

  while e = bodyslices.shift do
    # Read error messages and delivery status lines from the head of the email to the previous
    # line of the beginning of the original message.
    if readcursor == 0
      # Beginning of the bounce message or message/delivery-status part
      readcursor |= Indicators[:deliverystatus] if e.include?(StartingOf[:message][0])
    end
    next if (readcursor & Indicators[:deliverystatus]) == 0 || e.empty?

    v = dscontents[-1]
    if e.start_with?('-- ')
      # An email that you attempted to send to the following address could not be delivered:
      # -- sabineko@neko.ef.example.org
      cv = e[3, 256]
      if cv.include?(' ') == false
        # -- sotoneko@cat.example.com
        if v["recipient"] != ""
          # There are multiple recipient addresses in the message body.
          dscontents << Sisimai::Lhost.DELIVERYSTATUS
          v = dscontents[-1]
        end
        v['recipient'] = Sisimai::Address.s3s4(cv)
        recipients += 1
      else
        # Deal each line begins with "-- " as an error message.
        #   The problem appears to be :
        #   -- Recipient email address is possibly incorrect
        #   Additional information follows :
        #   -- 5.4.1 Recipient address rejected: Access denied. 
        v["diagnosis"] += cv + " "
      end
    else
      # Lines after Content-Type: message/delivery-status
      f = Sisimai::RFC1894.match(e)
      if f > 0
        # "e" matched with any field defined in RFC3464
        next unless o = Sisimai::RFC1894.field(e)

        if o[3] == 'code'
          # Diagnostic-Code: SMTP; 550 5.1.1 <userunknown@example.jp>... User Unknown
          v['spec'] = o[1]
          v['diagnosis'] = o[2]
        else
          # Other DSN fields defined in RFC3464
          next if fieldtable[o[0]].nil?
          next if o[3] == "host" && Sisimai::RFC1123.is_internethost(o[2]) == false
          v[fieldtable[o[0]]] = o[2]

          next if f != 1
          permessage[fieldtable[o[0]]] = o[2]
        end
      end
    end
  end
  return nil if recipients == 0

  dscontents.each do |e|
    # Set default values if each value is empty.
    permessage.each_key { |a| e[a] ||= permessage[a] || '' }
  end

  return { 'ds' => dscontents, 'rfc822' => emailparts[1] }
end