#!/usr/bin/perl
# Copyright 2005 Messiah College. All rights reserved.
# Jason Long <jlong@messiah.edu>
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
use strict;
use warnings;
package Mail::DKIM::Canonicalization::simple;
use base "Mail::DKIM::Canonicalization::DkimCommon";
use Carp;
sub init
{
my $self = shift;
$self->SUPER::init;
$self->{canonicalize_body_empty_lines} = 0;
}
sub canonicalize_header
{
my $self = shift;
croak "wrong number of parameters" unless (@_ == 1);
my ($line) = @_;
#
# draft-allman-dkim-base-01.txt, section 3.4.1:
# the "simple" header field canonicalization algorithm does not
# change the header field in any way
#
return $line;
}
sub canonicalize_body
{
my $self = shift;
my ($multiline) = @_;
#
# draft-allman-dkim-base-01.txt, section 3.4.3:
# the "simple" body canonicalization algorithm ignores all
# empty lines at the end of the message body
#
#
# (i.e. do not emit empty lines until a following nonempty line
# is found)
#
my $empty_lines = $self->{canonicalize_body_empty_lines};
if ( $multiline =~ s/^((?:\015\012)+)// )
{ # count & strip leading empty lines
$empty_lines += length($1)/2;
}
if (length($multiline) > 0)
{
$self->{canonicalize_body_started} = 1;
if ($empty_lines > 0)
{ # re-insert leading white if any nonempty lines exist
$multiline = ("\015\012" x $empty_lines) . $multiline;
$empty_lines = 0;
}
}
while ($multiline =~ /\015\012\015\012\z/)
{ # count & strip trailing empty lines
chop $multiline; chop $multiline;
$empty_lines++;
}
$self->{canonicalize_body_empty_lines} = $empty_lines;
return $multiline;
}
sub finish_body
{
my $self = shift;
$self->{canonicalize_body_started}
or $self->output("\015\012");
$self->SUPER::finish_body;
}
1;
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