# The LearningOnline Network
# Cookie Based Access Handler
#
# $Id: lonacc.pm,v 1.22 2001/11/29 19:12:44 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/
#
# 5/21/99,5/22,5/29,5/31,6/15,16/11,22/11,
# 01/06,01/13,05/31,06/01,09/06,09/25,09/28,10/30,11/6,
# 12/25,12/26,
# 01/06/01,05/28,8/11,9/26 Gerd Kortemeyer

package Apache::lonacc;

use strict;
use Apache::Constants qw(:common :http :methods);
use Apache::File;
use Apache::lonnet;
use CGI::Cookie();
use Fcntl qw(:flock);

sub handler {
    my $r = shift;
    my $requrl=$r->uri;
    my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
    my $lonid=$cookies{'lonID'};
    my $cookie;
    if ($lonid) {
	my $handle=$lonid->value;
        $handle=~s/\W//g;
        my $lonidsdir=$r->dir_config('lonIDsDir');
        if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {

# ------------------------------------------- Transfer profile into environment

            my @profile;
	    {
             my $idf=Apache::File->new("$lonidsdir/$handle.id");
             flock($idf,LOCK_SH);
             @profile=<$idf>;
             $idf->close();
	    }
            my $envi;
            for ($envi=0;$envi<=$#profile;$envi++) {
		chomp($profile[$envi]);
		my ($envname,$envvalue)=split(/=/,$profile[$envi]);
                $ENV{$envname} = $envvalue;
            }
            $ENV{'user.environment'} = "$lonidsdir/$handle.id";
            if ($requrl=~/^\/res\//) {
               $ENV{'request.state'} = "published";
	    } else {
	       $ENV{'request.state'} = 'unknown';
            }
            $ENV{'request.filename'} = $r->filename;

# -------------------------------------------------------- Load POST parameters


           
        my $buffer;

        $r->read($buffer,$r->header_in('Content-length'));

	unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
            my @pairs=split(/&/,$buffer);
            my $pair;
            foreach $pair (@pairs) {
               my ($name,$value) = split(/=/,$pair);
               $value =~ tr/+/ /;
               $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
               $name  =~ tr/+/ /;
               $name  =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
               $ENV{"form.$name"}=$value;
            }
        } else {
	    my $contentsep=$1;
            my @lines = split (/\n/,$buffer);
            my $name='';
            my $value='';
            my $fname='';
            my $fmime='';
            my $i;
            for ($i=0;$i<=$#lines;$i++) {
		if ($lines[$i]=~/^$contentsep/) {
		    if ($name) {
                        chomp($value);
			if ($fname) {
			    $ENV{"form.$name.filename"}=$fname;
                            $ENV{"form.$name.mimetype"}=$fmime;
                        } else {
                            $value=~s/\s+$//s;
                        }
                        $ENV{"form.$name"}=$value;
                    }
                    if ($i<$#lines) {
			$i++;
                        $lines[$i]=~
		 /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
                        $name=$1;
                        $value='';
                        if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
			   $fname=$1;
                           if 
                            ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
			      $fmime=$1;
                              $i++;
			   } else {
                              $fmime='';
                           }
                        } else {
			    $fname='';
                            $fmime='';
                        }
                        $i++;
                    }
                } else {
		    $value.=$lines[$i]."\n";
                }
            }
	}
            $r->method_number(M_GET);
	    $r->method('GET');
            $r->headers_in->unset('Content-length');

# ---------------------------------------------------------------- Check access

            if ($requrl!~/^\/adm\//) {
		my $access=&Apache::lonnet::allowed('bre',$requrl);
                if ($access eq '1') {
		   $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
	           return HTTP_NOT_ACCEPTABLE; 
                }
                if (($access ne '2') && ($access ne 'F')) {
		   $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
	           return HTTP_NOT_ACCEPTABLE; 
                }
            } 
            return OK; 
        } else { 
            $r->log_reason("Cookie $handle not valid", $r->filename) 
        };
    }

# -------------------------------------------- See if this is a public resource
    if (&Apache::lonnet::metadata($requrl,'copyright') eq 'public') {
        &Apache::lonnet::logthis('Granting public access: '.$requrl);
	$ENV{'user.name'}='public';
        $ENV{'user.domain'}='public';
        $ENV{'request.state'} = "published";
        $ENV{'request.publicaccess'} = 1;
        $ENV{'request.filename'} = $r->filename;
        return OK;
    }
# ----------------------------------------------- Store where they wanted to go
    
    $ENV{'request.firsturl'}=$requrl;
    return FORBIDDEN;
}

1;
__END__