/usr/share/perl5/Mail/DKIM/Canonicalization/relaxed.pm is in libmail-dkim-perl 0.44-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | #!/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::relaxed;
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) = @_;
#
# step 1: convert all header field names (not the header field values)
# to lower case
#
if ($line =~ /^([^:]+):(.*)/s)
{
# lowercase field name
$line = lc($1) . ":$2";
}
#
# step 2: unwrap all header field continuation lines... i.e.
# remove any CRLF sequences that are followed by WSP
#
$line =~ s/\015\012(\s)/$1/g;
#
# step 3: convert all sequences of one or more WSP characters to
# a single SP character
#
$line =~ s/[ \t]+/ /g;
#
# step 4: delete all WSP characters at the end of the header field value
#
$line =~ s/ \z//s;
#
# step 5: delete any WSP character remaining before and after the colon
# separating the header field name from the header field value
#
$line =~ s/^([^:\s]+)\s*:\s*/$1:/;
return $line;
}
sub canonicalize_body
{
my $self = shift;
my ($multiline) = @_;
$multiline =~ s/\015\012\z//s;
#
# step 1: ignore all white space at the end of lines
#
$multiline =~ s/[ \t]+(?=\015\012|\z)//g;
#
# step 2: reduce all sequences of WSP within a line to a single
# SP character
#
$multiline =~ s/[ \t]+/ /g;
$multiline .= "\015\012";
#
# step 3: ignore 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($1)/2;
}
if ($empty_lines > 0 && length($multiline) > 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;
}
1;
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