--- loncom/auth/loncacc.pm	2000/09/25 20:34:28	1.9
+++ loncom/auth/loncacc.pm	2013/06/04 23:12:13	1.61
@@ -1,91 +1,142 @@
 # The LearningOnline Network
-# Cookie Based Access Handler for Construction Area
+# Cookie Based Access Handler for Authoring Spaces
 # (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer)
-# 6/15,16/11,22/11,
-# 01/06,01/11,6/1,9/25 Gerd Kortemeyer
+#
+# $Id: loncacc.pm,v 1.61 2013/06/04 23:12:13 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 Authoring Spaces 
+
+=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 the following two types of URI 
+(one for files, and one for directories):
+
+ <LocationMatch "^/priv.*">
+ <LocationMatch "^/priv.*/$">
+
+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
+
+=cut
+
 
 package Apache::loncacc;
 
 use strict;
-use Apache::Constants qw(:common :http :methods);
-use Apache::File;
-use CGI::Cookie();
+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 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;
+    $env{'request.editurl'}=$requrl;
+
+    my $handle =  &Apache::lonnet::check_for_valid_session($r);
+    if ($handle ne '') {
+
+# ------------------------------------------------------ Initialize Environment
         my $lonidsdir=$r->dir_config('lonIDsDir');
-        if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
-            my $ownername=$requrl;
-            $ownername=~s/\/\~(\w+).*/\1/;
-            my $ownerdomain=$r->dir_config('lonDefDomain');
-            my @handleparts=split(/\_/,$handle);
-            my $username=$handleparts[0];
-            my $domain=$handleparts[2];
-            if (($username ne $ownername) || ($domain ne $ownerdomain)) {
-                $r->log_reason
-                   ("$username at $domain not authorized", $r->filename); 
-	        return HTTP_NOT_ACCEPTABLE;
-            }
-            my @profile;
-	    {
-             my $idf=Apache::File->new("$lonidsdir/$handle.id");
-             @profile=<$idf>;
-	    }
-            my $envi;
-            for ($envi=0;$envi<=$#profile;$envi++) {
-		chomp($profile[$envi]);
-		my ($envname,$envvalue)=split(/=/,$profile[$envi]);
-                $ENV{$envname} = $envvalue;
+	&Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
+
+# --------------------------------------------------------- Initialize Language
+ 
+	&Apache::lonlocal::get_language_handle($r);
+
+# -------------------------------------------------------------- Resource State
+
+	$env{'request.state'}    = "construct";
+	$env{'request.filename'} = $r->filename;
+
+	my $allowed;
+	my ($ownername,$ownerdom,$ownerhome) = 
+            &Apache::lonnet::constructaccess($requrl,'setpriv');
+        if (($ownername ne '') && ($ownerdom ne '') && ($ownerhome ne '')) {
+            unless ($ownerhome eq 'no_host') {
+                my @hosts = &Apache::lonnet::current_machine_ids();
+                if (grep(/^\Q$ownerhome\E$/,@hosts)) {
+                    $allowed = 1;
+                }
             }
-            $ENV{'user.environment'} = "$lonidsdir/$handle.id";
-            $ENV{'request.state'}    = "construct";
-            $ENV{'request.filename'} = $r->filename;
+        }
 
-# -------------------------------------------------------- Load POST parameters
+        unless ($allowed) {
+	    $r->log_reason("Unauthorized $requrl", $r->filename); 
+	    return HTTP_NOT_ACCEPTABLE;
+	}
 
+# -------------------------------------------------------- Load POST parameters
 
-            my $buffer;
+	&Apache::lonacc::get_posted_cgi($r);
 
-            $r->read($buffer,$r->header_in('Content-length'));
-            my @pairs=split(/&/,$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;
-               $ENV{"form.$name"}=$value;
-            } 
-
-            $r->method_number(M_GET);
-	    $r->method('GET');
-            $r->headers_in->unset('Content-length');
-
-            return OK; 
-        } else { 
-            $r->log_reason("Cookie $handle not valid", $r->filename) 
-        };
+	return OK; 
+    } else {
+	$r->log_reason("Cookie $handle not valid", $r->filename) 
     }
 
 # ----------------------------------------------- Store where they wanted to go
 
-    $ENV{'request.firsturl'}=$requrl;
+    $env{'request.firsturl'}=$requrl;
     return FORBIDDEN;
 }
 
 1;
 __END__
 
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