File Coverage

lib/Sisimai/Lhost/X3.pm

Criterion	Covered	Total	%
statement	43	45	95.5
branch	20	22	90.9
condition	8	10	80.0
subroutine	6	6	100.0
pod	2	2	100.0
total	79	85	92.9

package Sisimai::Lhost::X3;
use parent 'Sisimai::Lhost';
use v5.26;
use strict;
use warnings;

sub description { 'Unknown MTA #3' }
sub inquire {
    # Detect an error from Unknown MTA #3
    # @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   [undef]         failed to decode or the arguments are missing
    # @since v4.1.9
    my $class = shift;
    my $mhead = shift // return undef;
    my $mbody = shift // return undef;

    return undef unless index($mhead->{'from'}, 'Mail Delivery System') == 0;
    return undef unless index($mhead->{'subject'}, 'Delivery status notification') == 0;

    require Sisimai::SMTP::Command;
    state $indicators = __PACKAGE__->INDICATORS;
    state $boundaries = ['Content-Type: message/rfc822'];
    state $startingof = {'message' => ['      This is an automatically generated Delivery Status Notification.']};

    my $dscontents = [__PACKAGE__->DELIVERYSTATUS]; my $v = undef;
    my $emailparts = Sisimai::RFC5322->part($mbody, $boundaries);
    my $readcursor = 0;     # (Integer) Points the current cursor position
    my $recipients = 0;     # (Integer) The number of 'Final-Recipient' header

    for my $e ( split("\n", $emailparts->[0]) ) {
        # Read error messages and delivery status lines from the head of the email to the previous
        # line of the beginning of the original message.
        unless( $readcursor ) {
            # Beginning of the bounce message or message/delivery-status part
            $readcursor |= $indicators->{'deliverystatus'} if index($e, $startingof->{'message'}->[0]) == 0;
            next;
        }
        next if ($readcursor & $indicators->{'deliverystatus'}) == 0 || $e eq "";

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

        if( index($e, '  * ') > -1 && index($e, '@') > 1 ) {
            #   * [e-mail]
            if( $v->{'recipient'} ) {
                # There are multiple recipient addresses in the message body.
                push @$dscontents, __PACKAGE__->DELIVERYSTATUS;
                $v = $dscontents->[-1];
            }
            $v->{'recipient'} = substr($e, index($e, ' * ') + 3,);
            $recipients++;

        } else {
            # Detect error message
            if( index($e, 'SMTP:') == 0 ) {
                # SMTP:RCPT host 192.0.2.8: 553 5.3.0 ... No such user here
                $v->{'command'} = Sisimai::SMTP::Command->find($e);
                $v->{'diagnosis'} = $e;

            } elsif( index($e, 'Routing: ') == 0 ) {
                # Routing: Could not find a gateway for [e-mail]
                $v->{'diagnosis'} = substr($e, 9,);

            } elsif( index($e, 'Diagnostic-Code: smtp; ') == 0 ) {
                # Diagnostic-Code: smtp; 552 5.2.2 Over quota
                $v->{'diagnosis'} = substr($e, index($e, ';') + 2,);
            }
        }
    }
    return undef unless $recipients;
    return {"ds" => $dscontents, "rfc822" => $emailparts->[1]};
}

1;
__END__