module Sisimai::Lhost::MessageLabs

Sisimai::Lhost::MessageLabs parses a bounce email which created by Symantec.cloud: formerly MessageLabs. Methods in the module are called from only Sisimai::Message.

Constants

Indicators
ReBackbone
ReFailures
StartingOf

Public Class Methods

description() click to toggle source
# File lib/sisimai/lhost/messagelabs.rb, line 119
def description; return 'Symantec.cloud http://www.messagelabs.com'; end
make(mhead, mbody) click to toggle source

Parse bounce messages from Symantec.cloud(MessageLabs) @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/messagelabs.rb, line 23
def make(mhead, mbody)
  # X-Msg-Ref: server-11.tower-143.messagelabs.com!1419367175!36473369!1
  # X-Originating-IP: [10.245.230.38]
  # X-StarScan-Received:
  # X-StarScan-Version: 6.12.5; banners=-,-,-
  # X-VirusChecked: Checked
  return nil unless mhead['x-msg-ref']
  return nil unless mhead['from'].include?('MAILER-DAEMON@messagelabs.com')
  return nil unless mhead['subject'].start_with?('Mail Delivery Failure')

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

  dscontents = [Sisimai::Lhost.DELIVERYSTATUS]
  emailsteak = Sisimai::RFC5322.fillet(mbody, ReBackbone)
  bodyslices = emailsteak[0].split("\n")
  readslices = ['']
  readcursor = 0      # (Integer) Points the current cursor position
  recipients = 0      # (Integer) The number of 'Final-Recipient' header
  commandset = []     # (Array) ``in reply to * command'' list
  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.
    readslices << e # Save the current line for the next loop

    if readcursor == 0
      # Beginning of the bounce message or message/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?

    if f = Sisimai::RFC1894.match(e)
      # "e" matched with any field defined in RFC3464
      next unless o = Sisimai::RFC1894.field(e)
      v = dscontents[-1]

      if o[-1] == 'addr'
        # Final-Recipient: rfc822; kijitora@example.jp
        # X-Actual-Recipient: rfc822; kijitora@example.co.jp
        if o[0] == 'final-recipient'
          # Final-Recipient: rfc822; kijitora@example.jp
          if v['recipient']
            # There are multiple recipient addresses in the message body.
            dscontents << Sisimai::Lhost.DELIVERYSTATUS
            v = dscontents[-1]
          end
          v['recipient'] = o[2]
          recipients += 1
        else
          # X-Actual-Recipient: rfc822; kijitora@example.co.jp
          v['alias'] = o[2]
        end
      elsif o[-1] == '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 unless fieldtable[o[0]]
        v[fieldtable[o[0]]] = o[2]

        next unless f == 1
        permessage[fieldtable[o[0]]] = o[2]
      end
    else
      # Continued line of the value of Diagnostic-Code field
      next unless readslices[-2].start_with?('Diagnostic-Code:')
      next unless cv = e.match(/\A[ \t]+(.+)\z/)
      v['diagnosis'] << ' ' << cv[1]
      readslices[-1] = 'Diagnostic-Code: ' << e
    end
  end
  return nil unless recipients > 0

  dscontents.each do |e|
    # Set default values if each value is empty.
    e['lhost'] ||= permessage['rhost']
    permessage.each_key { |a| e[a] ||= permessage[a] || '' }
    e['command']   = commandset.shift || ''
    e['diagnosis'] = Sisimai::String.sweep(e['diagnosis'])

    ReFailures.each_key do |r|
      # Verify each regular expression of session errors
      next unless e['diagnosis'] =~ ReFailures[r]
      e['reason'] = r
      break
    end
  end

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