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- Fix typo.

# The LearningOnline Network
# Cookie Based Access Handler for Construction Area
# (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
#
# $Id: loncacc.pm,v 1.50 2009/10/07 14:47:48 raeburn 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/
#

=pod

=head1 NAME

Apache::lonacc - Cookie Based Access Handler for Construction Area

=head1 SYNOPSIS

Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf:

 PerlAccessHandler       Apache::loncacc

=head1 INTRODUCTION

This module enables cookie based authentication for construction area
and is used to control access for three (essentially equivalent) URIs.

 <LocationMatch "^/priv.*">
 <LocationMatch "^/\~.*">
 <LocationMatch "^/\~.*/$">

Whenever the client sends the cookie back to the server, 
if the cookie is missing or invalid, the user is re-challenged
for login information.

This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.

=head1 HANDLER SUBROUTINE

This routine is called by Apache and mod_perl.

=over 4

=item *

load POST parameters

=item *

store where they wanted to go (first url entered)

=back

=head1 OTHERSUBROUTINES

=over

=item constructaccess($url,$ownerdomain)

See if the owner domain and name
in the URL match those in the expected environment.  If so, return 
two element list ($ownername,$ownerdomain).  Else, return null string.

=back

=cut


package Apache::loncacc;

use strict;
use Apache::Constants qw(:common :http :methods REDIRECT);
use Fcntl qw(:flock);
use Apache::lonlocal;
use Apache::lonnet;
use Apache::lonacc;
use LONCAPA qw(:DEFAULT :match);

sub constructaccess {
    my ($url,$ownerdomain,$setpriv)=@_;
    my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)($match_username)\//);
    unless (($ownername) && ($ownerdomain)) { return ''; }
    # We do not allow editing of previous versions of files.
    if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
    my @possibledomains = &Apache::lonnet::current_machine_domains();
    if ($ownername eq $env{'user.name'}) {
	foreach my $domain (@possibledomains) {
	    if ($domain eq $env{'user.domain'}) {
		return ($ownername,$domain);
	    }
	}
    }
    
    foreach my $domain (@possibledomains) {
	if (exists($env{'user.priv.ca./'.$domain.'/'.$ownername.'./'}) ||
	    exists($env{'user.priv.aa./'.$domain.'/'.$ownername.'./'}) ) {
	    return ($ownername,$domain);
	}
    }

    my $then=$env{'user.login.time'};
    my %dcroles = ();
    if (&is_active_dc($ownerdomain,$then)) {
        my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],
                                         $ownerdomain,$ownername);
        unless ($blocked{'domcoord.author'} eq 'blocked') {
            if (grep(/^$ownerdomain$/,@possibledomains)) {
                if ($setpriv) {
                    my $now = time;
                    &Apache::lonnet::check_adhoc_privs($ownerdomain,$ownername,
                                                       $then,$now,'ca');
                }
                return($ownername,$ownerdomain);
            }
        }
    }
    return '';
}

sub is_active_dc {
    my ($ownerdomain,$then) = @_;
    my $livedc;
    if ($env{'user.adv'}) {
        my $domrole = $env{'user.role.dc./'.$ownerdomain.'/'};
        if ($domrole) {
            my ($tstart,$tend)=split(/\./,$domrole);
            $livedc = 1;
            if ($tstart && $tstart>$then) { undef($livedc); }
            if ($tend   && $tend  <$then) { undef($livedc); }
        }
    }
    return $livedc;
}


sub handler {
    my $r = shift;
    my $requrl=$r->uri;
    $env{'request.editurl'}=$requrl;

    my $handle =  &Apache::lonnet::check_for_valid_session($r);
    if ($handle ne '') {

# ------------------------------------------------------ Initialize Environment
        my $lonidsdir=$r->dir_config('lonIDsDir');
	&Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);

# --------------------------------------------------------- Initialize Language
 
	&Apache::lonlocal::get_language_handle($r);

# -------------------------------------------------------------- Resource State

	$env{'request.state'}    = "construct";
	$env{'request.filename'} = $r->filename;

	unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'),'setpriv')) {
	    $r->log_reason("Unauthorized $requrl", $r->filename); 
	    return HTTP_NOT_ACCEPTABLE;
	}

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

	&Apache::lonacc::get_posted_cgi($r);

	return OK; 
    } else { 
	$r->log_reason("Cookie $handle not valid", $r->filename) 
    }

# ----------------------------------------------- Store where they wanted to go

    $env{'request.firsturl'}=$requrl;
    return FORBIDDEN;
}

1;
__END__