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package Email::MIME::Header::Encode;
use strict;
use warnings;
use Email::Address;
use Encode ();
use MIME::Base64();
use Sub::Exporter -setup => {
exports => [ 'mime_encode_header' ],
};
my %encoders = (
'Date' => \&_date_time_encode,
'From' => \&_mailbox_list_encode,
'Sender' => \&_mailbox_encode,
'Reply-To' => \&_address_list_encode,
'To' => \&_address_list_encode,
'Cc' => \&_address_list_encode,
'Bcc' => \&_address_list_encode,
'Message-ID' => \&_msg_id_encode,
'In-Reply-To' => \&_msg_id_encode,
'References' => \&_msg_id_encode,
'Subject' => \&_unstructured_encode,
'Comments' => \&_unstructured_encode,
);
sub mime_encode_header {
my ($header, $body, $charset, $encoding) = @_;
return $body unless $body =~ /\P{ASCII}/
|| $body =~ /=\?/;
$header =~ s/^Resent-//;
return $encoders{$header}->($body, $charset, $encoding)
if exists $encoders{$header};
return _unstructured_encode($body, $charset, $encoding);
}
sub _date_time_encode {
my ($val, $charset, $encoding) = @_;
return $val;
}
sub _mailbox_encode {
my ($val, $charset, $encoding) = @_;
return _mailbox_list_encode($val, $charset);
}
sub _mailbox_list_encode {
my ($val, $charset, $encoding) = @_;
my @addrs = Email::Address->parse($val);
@addrs = map {
my $phrase = $_->phrase;
$_->phrase(_mime_encode($phrase, $charset, $encoding))
if $phrase =~ /\P{ASCII}/;
my $comment = $_->comment;
$_->comment(_mime_encode($comment, $charset, $encoding))
if $comment =~ /\P{ASCII}/;
$_;
} @addrs;
return join(', ', map { $_->format } @addrs);
}
sub _address_encode {
my ($val, $charset, $encoding) = @_;
return _address_list_encode($val, $charset, $encoding);
}
sub _address_list_encode {
my ($val, $charset, $encoding) = @_;
return _mailbox_list_encode($val, $charset, $encoding); # XXX is this right?
}
sub _msg_id_encode {
my ($val, $charset, $encoding) = @_;
return $val;
}
sub _unstructured_encode {
my ($val, $charset, $encoding) = @_;
return _mime_encode($val, $charset, $encoding);
}
sub _mime_encode {
my ($val, $charset, $encoding) = @_;
$encoding = $encoding || 'base64';
if ($encoding eq 'base64') {
return _mime_encode_base64($val, $charset);
}
else {
# TODO: write an encoder for quoted-printable? the tricky part there is
# the folding whitespace
die "Encoding $encoding is not supported";
}
}
sub _mime_encode_base64 {
my $text = shift;
my $charset = Encode::find_encoding(shift)->mime_name();
my $head = '=?' . $charset . '?B?';
my $tail = '?=';
my $base_length = 75 - ( length($head) + length($tail) );
# This code is copied from Mail::Message::Field::Full in the Mail-Box
# distro.
my $real_length = int( $base_length / 4 ) * 3;
my @result;
my $chunk = q{};
while ( length( my $chr = substr( $text, 0, 1, '' ) ) ) {
my $chr = Encode::encode( $charset, $chr, 0 );
if ( length($chunk) + length($chr) > $real_length ) {
push @result, $head . MIME::Base64::encode_base64( $chunk, q{} ) . $tail;
$chunk = q{};
}
$chunk .= $chr;
}
push @result, $head . MIME::Base64::encode_base64( $chunk, q{} ) . $tail
if length $chunk;
return join q{ }, @result;
}
1;
|
