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#-*- perl -*-
#
# Copyright (C) 2008 Ken'ichi Fukamachi
# All rights reserved. This program is free software; you can
# redistribute it and/or modify it under the same terms as Perl itself.
#
# $FML: @template.pm,v 1.12 2008/08/24 08:28:36 fukachan Exp $
#
package FML::String::Random;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;
=head1 NAME
FML::String::Random - create a random string.
=head1 SYNOPSIS
my $random = new FML::String::Random;
my $magic = $random->magic_string();
my $id = $random->identifier($magic);
=head1 DESCRIPTION
This class generates a magic string and the identifier used for the
session ID.
=head1 METHODS
=head2 new()
constructor.
=cut
# Descriptions: constructor.
# Arguments: OBJ($self)
# Side Effects: none
# Return Value: OBJ
sub new
{
my ($self) = @_;
my ($type) = ref($self) || $self;
my $me = {};
return bless $me, $type;
}
=head2 magic_string()
generate a random magic string.
Currently, the string is a combination of
qw(a b c d e f g h k m n p r s t x y z 2 3 4 5 6 8);
letters.
=cut
# Descriptions: generate a random magic string.
# Arguments: OBJ($self)
# Side Effects: none
# Return Value: STR
sub magic_string
{
my ($self) = @_;
# XXX Crypt::RandPasswd may be too slow sometimes.
my (@string) = qw(a b c d e f g h k m n p r s t x y z 2 3 4 5 6 8);
my ($strlen) = $#string;
my (@result) = ();
srand(time|$$);
for (my $i = 0; $i < 8; $i++) {
my $j = int(rand($strlen));
$result[ $i ] = $string[ $j ];
}
return join("", @result);
}
=head2 identifier($buf)
generate an identifier from $buf. It is used for the session ID.
=cut
# Descriptions: generate an identifier from $buf.
# Arguments: OBJ($self) STR($buf)
# Side Effects: none
# Return Value: STR
sub identifier
{
my ($self, $buf) = @_;
my ($id_01) = sprintf("%s %s %s", rand(time), $$, $buf);
my ($id_02) = sprintf("%s %s %s", $$, $buf, rand(time));
use Mail::Message::Checksum;
my $cksum = new Mail::Message::Checksum;
my $sum = $cksum->md5( \$id_01 );
my $sum_ya = $cksum->md5( \$id_02 );
my $pebot = int(rand(32));
my $sum_l = substr($sum, 0, $pebot -1);
my $sum_r = substr($sum, $pebot + 1, 32 - $pebot);
return sprintf("%s%s%s", $sum_r, $sum_ya, $sum_l);
}
#
# DEBUG
#
if ($0 eq __FILE__) {
my $random = new FML::String::Random;
my $magic = $random->magic_string();
my $id = $random->identifier($magic);
printf("magic string = %s\n", $magic);
printf("identifier = %s\n", $id);
}
=head1 CODING STYLE
See C<http://www.fml.org/software/FNF/> on fml coding style guide.
=head1 AUTHOR
Ken'ichi Fukamachi
=head1 COPYRIGHT
Copyright (C) 2008 Ken'ichi Fukamachi
All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
=head1 HISTORY
FML::String::Random appeared in fml8 mailing list driver package.
See C<http://www.fml.org/> for more details.
=cut
1;
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