# The LearningOnline Network
# Low security Access Handler for Token-based access 
# (clearance given by other loncapa host)
#
# $Id: lontokacc.pm,v 1.3 2002/07/31 15:23:55 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::lontokacc;

use strict;
use Apache::Constants qw(:common);
use Apache::lonnet();
use Apache::loncommon();

sub handler {
    my $r = shift;
    my $query=$r->args;
    &Apache::loncommon::get_unprocessed_cgi($query,['token','server']);
    my $tmpinfo='no_token';
    if (($ENV{'form.token'}) || ($ENV{'form.server'})) {
        $tmpinfo=&Apache::lonnet::unescape(
                   &Apache::lonnet::reply('tmpget:'.$ENV{'form.token'},
                                                    $ENV{'form.server'}));
        chomp($tmpinfo);
        my $uri=$r->uri;
        if ($tmpinfo=~/$uri$/) {
	   return OK;
        }
    }
    $r->log_reason("Invalid token-based access:".$r->uri.' for '.$tmpinfo.'.',
        $r->filename); 
    return FORBIDDEN;
}

1;
__END__