module Sisimai::Lhost::X2

Sisimai::Lhost::X2 parses a bounce email which created by Unknown MTA #2. Methods in the module are called from only Sisimai::Message.

Constants

Indicators
ReBackbone
StartingOf

Public Class Methods

description() click to toggle source
# File lib/sisimai/lhost/x2.rb, line 67
def description; return 'Unknown MTA #2'; end
make(mhead, mbody) click to toggle source

Parse bounce messages from Unknown MTA #2 @param [Hash] mhead Message headers of a bounce email @param [String] mbody Message body of a bounce email @return [Hash] Bounce data list and message/rfc822 part @return [Nil] it failed to parse or the arguments are missing

# File lib/sisimai/lhost/x2.rb, line 18
def make(mhead, mbody)
  return nil unless mhead['from'].include?('MAILER-DAEMON@')
  return nil unless mhead['subject'] =~ %r/\A(?>Delivery failure|fail(?:ure|ed) delivery)/

  dscontents = [Sisimai::Lhost.DELIVERYSTATUS]
  emailsteak = Sisimai::RFC5322.fillet(mbody, ReBackbone)
  bodyslices = emailsteak[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
    next if e.empty?

    # Message from example.com.
    # Unable to deliver message to the following address(es).
    #
    # <kijitora@example.com>:
    # This user doesn't have a example.com account (kijitora@example.com) [0]
    v = dscontents[-1]

    if cv = e.match(/\A[<]([^ ]+[@][^ ]+)[>]:\z/)
      # <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'] = cv[1]
      recipients += 1
    else
      # This user doesn't have a example.com account (kijitora@example.com) [0]
      v['diagnosis'] ||= ''
      v['diagnosis'] << ' ' << e
    end
  end
  return nil unless recipients > 0

  dscontents.each { |e| e['diagnosis'] = Sisimai::String.sweep(e['diagnosis']) }
  return { 'ds' => dscontents, 'rfc822' => emailsteak[1] }
end