# This file is an example of how to write a filter for DynamicTemplate.
# It converts text into Javascript which when run reproduces the original
# text. Its purpose is to hide email addresses from spam harvesters.

# Copyright Bernard Simon, 2005. You may use this file as you wish as
# long as this copyright notice is maintained.

package Blosxom::Plugin::DynamicTemplate;

use strict;

sub encode {
    my @b = _xor_it (@_);
    my $c = "var a = [" . join (',', @b) . "];";
    return <<"EOQ";
<script type="text/javascript" language="JavaScript">
$c
var b='';for(i=1;i<a.length;i++){b=b+String.fromCharCode(a[i-1]^a[i]);}
document.write (b);
</script>
EOQ
}

sub _xor_it {
    my @a = map (ord ($_), split (//, join (' ', @_)));
    
    my @b;
    my $b = int (rand (256));
    push (@b, $b);
    foreach my $a (@a) {
	$b = $b ^ $a;
	push (@b, $b); 
    }
    return @b;
}

1;