Module: Sisimai::Lhost::X3

Defined in:
lib/sisimai/lhost/x3.rb

Overview

Sisimai::Lhost::X3 decodes a bounce email which created by Unknown MTA #3. Methods in the module are called from only Sisimai::Message.

Constant Summary collapse

Indicators = 
Sisimai::Lhost.INDICATORS
Boundaries = 
['Content-Type: message/rfc822'].freeze
StartingOf = 
{message: ['      This is an automatically generated Delivery Status Notification.']}.freeze

Class Method Summary collapse

Class Method Details

.description ⇒ Object 



86
 
# File 'lib/sisimai/lhost/x3.rb', line 86

def description; return 'Unknown MTA #3'; end

.inquire(mhead, mbody) ⇒ Hash, Nil

This method is abstract.

Decodes the bounce message from Unknown MTA #3

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/x3.rb', line 17

def inquire(mhead, mbody)
  return nil if mhead['subject'].start_with?('Delivery status notification') == false
  return nil if mhead['from'].start_with?('Mail Delivery System') == false

  require 'sisimai/smtp/command'
  dscontents = [Sisimai::Lhost.DELIVERYSTATUS]
  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
  v = nil

  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 delivery status part
      readcursor |= Indicators[:deliverystatus] if e.start_with?(StartingOf[:message][0])
      next
    end
    next if (readcursor & Indicators[:deliverystatus]) == 0 || e.empty?

    # ============================================================================
    #      This is an automatically generated Delivery Status Notification.
    #
    # Delivery to the following recipients failed permanently:
    #
    #   * kijitora@example.com
    #
    #
    # ============================================================================
    #                             Technical details:
    #
    # SMTP:RCPT host 192.0.2.8: 553 5.3.0 <kijitora@example.com>... No such user here
    #
    #
    # ============================================================================
    v = dscontents[-1]

    if e.include?('  * ') && e.include?('@')
      #   * kijitora@example.com
      if v["recipient"] != ""
        # There are multiple recipient addresses in the message body.
        dscontents << Sisimai::Lhost.DELIVERYSTATUS
        v = dscontents[-1]
      end
      v['recipient'] = e[e.index(' * ') + 3, e.size]
      recipients += 1
    else
      # Detect error message
      case
      when e.start_with?('SMTP:')
        # SMTP:RCPT host 192.0.2.8: 553 5.3.0 <kijitora@example.com>... No such user here
        v['command'] = Sisimai::SMTP::Command.find(e)
        v['diagnosis'] = e

      when e.start_with?('Routing: ') 
        # Routing: Could not find a gateway for kijitora@example.co.jp
        v['diagnosis'] = e[9, e.size]

      when e.start_with?('Diagnostic-Code: smtp; ')
        # Diagnostic-Code: smtp; 552 5.2.2 Over quota
        v['diagnosis'] = e[e.index(';') + 2, e.size]
      end
    end
  end
  return nil if recipients == 0
  return {"ds" => dscontents, "rfc822" => emailparts[1]}
end