Module: Sisimai::Lhost::X2

Defined in:
lib/sisimai/lhost/x2.rb

Overview

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

Constant Summary collapse

Indicators = 
Sisimai::Lhost.INDICATORS
Boundaries = 
['--- Original message follows.'].freeze
StartingOf = 
{
message: [
  "Unable to deliver message to the following address",
  "This Delivery Status Notification is sent from MTA",
]}.freeze

Class Method Summary collapse

Class Method Details

.description ⇒ Object 



93
 
# File 'lib/sisimai/lhost/x2.rb', line 93

def description; return 'Unknown MTA #2'; end

.inquire(mhead, mbody) ⇒ Hash, Nil

This method is abstract.

Decodes the bounce message from Unknown MTA #2

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/x2.rb', line 21

def inquire(mhead, mbody)
  match   = false
  match ||= true if mhead['from'].include?('MAILER-DAEMON@')
  match ||= true if mhead['subject'].start_with?('Delivery failure')
  match ||= true if mhead['subject'].start_with?('failure delivery')
  match ||= true if mhead['subject'].start_with?('failed delivery')
  return nil if match == false

  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 delivery status part
      readcursor |= Indicators[:deliverystatus] if StartingOf[:message].any? { |a| e.start_with?(a) }
      next
    end
    next if (readcursor & Indicators[:deliverystatus]) == 0 || 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]
    # 
    # --- OR ---
    # 
    # This Delivery Status Notification is sent from MTA...
    # 
    # Your delivery to the following address has been failed.
    # Please refer to the below for details.
    # ------------------------------------------------------
    # 
    # Delivery failed: kijitora@example.co.jp
    # 192.0.2.25 does not like recipient.
    # Remote host said[Response Message]: 550 5.1.1 <kijitora@example.co.jp>:
    #   Recipient address rejected: User unknown in local recipient table
    # Giving up on 192.0.2.25.
    # STEP: RCPT TO
    v = dscontents[-1]

    if e.start_with?('<')                 && Sisimai::String.aligned(e, ['<', '@', '>:']) ||
       e.start_with?('Delivery failed: ') && Sisimai::String.aligned(e, ['failed: ', '@'])
      # <kijitora@example.com>:
      # Delivery failed: kijitora@example.co.jp
      if v["recipient"] != ""
        # There are multiple recipient addresses in the message body.
        dscontents << Sisimai::Lhost.DELIVERYSTATUS
        v = dscontents[-1]
      end
      v['recipient'] = e[1, e.size - 3] if e.start_with?('<')
      v['recipient'] = e[e.index(': ') + 2, e.size - 1] if v['recipient'].empty?
      recipients += 1

    elsif e.start_with?('STEP: ')
      # STEP: RCPT TO
      # STEP: DATA SEND
      v['command'] = Sisimai::SMTP::Command.find(e)

    elsif e.start_with?('-----') == false
      # This user doesn't have a example.com account (kijitora@example.com) [0]
      v['diagnosis'] += " #{e}"
    end
  end
  return nil if recipients == 0
  return {"ds" => dscontents, "rfc822" => emailparts[1]}
end