--- loncom/auth/lonacc.pm	1999/10/13 17:48:52	1.1
+++ loncom/auth/lonacc.pm	2005/01/25 00:28:00	1.59
@@ -1,12 +1,52 @@
 # The LearningOnline Network
 # Cookie Based Access Handler
-# 5/21/99,5/22,5/29,5/31,6/15 Gerd Kortemeyer
+#
+# $Id: lonacc.pm,v 1.59 2005/01/25 00:28:00 albertel 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/
+#
+# YEAR=1999
+# 5/21/99,5/22,5/29,5/31,6/15,16/11,22/11,
+# YEAR=2000
+# 01/06,01/13,05/31,06/01,09/06,09/25,09/28,10/30,11/6,
+# 12/25,12/26,
+# YEAR=2001
+# 01/06/01,05/28,8/11,9/26,11/29 Gerd Kortemeyer
+# YEAR=2002
+# 1/4,2/25 Gerd Kortemeyer
+#
+###
 
 package Apache::lonacc;
 
 use strict;
-use Apache::Constants qw(:common);
+use Apache::Constants qw(:common :http :methods);
+use Apache::File;
+use Apache::lonnet;
+use Apache::loncommon();
+use Apache::lonlocal;
 use CGI::Cookie();
+use Fcntl qw(:flock);
 
 sub handler {
     my $r = shift;
@@ -19,25 +59,208 @@ sub handler {
         $handle=~s/\W//g;
         my $lonidsdir=$r->dir_config('lonIDsDir');
         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
-           return OK; 
+
+# ------------------------------------------------------ Initialize Environment
+
+            &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
+
+# --------------------------------------------------------- Initialize Language
+
+	    &Apache::lonlocal::get_language_handle($r);
+
+# -------------------------------------------------------------- Resource State
+
+            if ($requrl=~/^\/+(res|uploaded)\//) {
+               $ENV{'request.state'} = "published";
+	    } else {
+	       $ENV{'request.state'} = 'unknown';
+            }
+            $ENV{'request.filename'} = $r->filename;
+            $ENV{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
+# -------------------------------------------------------- Load POST parameters
+
+	    &Apache::loncommon::get_posted_cgi($r);
+
+# ---------------------------------------------------------------- Check access
+
+            if ($requrl!~/^\/adm|public|prtspool\//) {
+		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; 
+                }
+            }
+	    if ($requrl =~ m|^/prtspool/|) {
+		my $start='/prtspool/'.$ENV{'user.name'}.'_'.
+		    $ENV{'user.domain'};
+		if ($requrl !~ /^\Q$start\E/) {
+		    $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
+		    return HTTP_NOT_ACCEPTABLE;
+		}
+	    }
+# ------------------------------------------------------------- This is allowed
+          if ($ENV{'request.course.id'}) {
+	    &Apache::lonnet::countacc($requrl);
+            $requrl=~/\.(\w+)$/;
+            if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
+ ($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$)/) ||
+ ($requrl=~/^\/adm\/wrapper\//) ||
+ ($requrl=~m|\.problem/smpedit$|) ||
+ ($requrl=~/^\/public\/.*\/syllabus$/)) {
+# ------------------------------------- This is serious stuff, get symb and log
+		my $query=$r->args;
+                my $symb;
+                if ($query) {
+		    &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
+                }
+                if ($ENV{'form.symb'}) {
+		    $symb=&Apache::lonnet::symbclean($ENV{'form.symb'});
+                    if ($requrl =~ m|^/adm/wrapper/|) {
+                        my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
+                        &Apache::lonnet::symblist($map,$murl => $mid,
+                                               'last_known' => $murl);
+                    } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
+			     (($requrl=~m|(.*)/smpedit$|) &&
+			      &Apache::lonnet::symbverify($symb,$1))) {
+                      my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
+                      &Apache::lonnet::symblist($map,$murl => $mid,
+                                               'last_known' => $murl);
+		    } else {
+			$r->log_reason('Invalid symb for '.$requrl.': '.
+                                       $symb);
+		        $ENV{'user.error.msg'}=
+                                "$requrl:bre:1:1:Invalid Access";
+  	                return HTTP_NOT_ACCEPTABLE; 
+                    }
+                } else {
+	            $symb=&Apache::lonnet::symbread($requrl);
+		    if (&Apache::lonnet::is_on_map($requrl) && $symb &&
+			!&Apache::lonnet::symbverify($symb,$requrl)) {
+			$r->log_reason('Invalid symb for '.$requrl.': '.$symb);
+		        $ENV{'user.error.msg'}=
+                                "$requrl:bre:1:1:Invalid Access";
+  	                return HTTP_NOT_ACCEPTABLE; 
+		    }
+                    my ($map,$mid,$murl)=split(/\_\_\_/,$symb);
+		    &Apache::lonnet::symblist($map,$murl => $mid,
+                                              'last_known' => $murl);
+                }
+                $ENV{'request.symb'}=$symb;
+                &Apache::lonnet::courseacclog($symb);
+            } else {
+# ------------------------------------------------------- This is other content
+                &Apache::lonnet::courseacclog($requrl);    
+            }
+	  }
+            return OK; 
         } else { 
-           $r->log_reason("Cookie $handle not valid", $r->filename) 
+            $r->log_reason("Cookie $handle not valid", $r->filename) 
         };
     }
-    $cookie=CGI::Cookie->new(-name  => 'lonURL',
-                             -value => $requrl, 
-                             -path  => '/');
-    $r->err_headers_out->add('Set-Cookie' => $cookie);
-    return FORBIDDEN;
+
+# -------------------------------------------- See if this is a public resource
+    if ($requrl=~m|^/public/|
+	|| (&Apache::lonnet::metadata($requrl,'copyright') eq 'public')) {
+        &Apache::lonnet::logthis('Granting public access: '.$requrl);
+	my $buffer;
+	$r->read($buffer,$r->header_in('Content-length'),0);
+	&Apache::loncommon::get_unprocessed_cgi($buffer);
+	$ENV{'user.name'}='public';
+        $ENV{'user.domain'}='public';
+        $ENV{'request.state'} = "published";
+        $ENV{'request.publicaccess'} = 1;
+        $ENV{'request.filename'} = $r->filename;
+	my ($httpbrowser,  $clientbrowser, $clientversion,
+	    $clientmathml, $clientunicode, $clientos) =
+		&Apache::loncommon::decode_user_agent($r);
+	$ENV{'browser.type'}=$clientbrowser;
+        $ENV{'browser.version'}=$clientversion;
+        $ENV{'browser.mathml'}=$clientmathml;
+        $ENV{'browser.unicode'}=$clientunicode;
+        $ENV{'browser.os'}=$clientos;
+
+        return OK;
+    }
+# -------------------------------------------------------------- Not authorized
+    $requrl=~/\.(\w+)$/;
+    if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
+        ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
+        ($requrl=~m|^/prtspool/|)) {
+# -------------------------- Store where they wanted to go and get login screen
+	$ENV{'request.querystring'}=$r->args;
+	$ENV{'request.firsturl'}=$requrl;
+       return FORBIDDEN;
+   } else {
+# --------------------------------------------------------------------- Goodbye
+       return HTTP_BAD_REQUEST;
+   }
 }
 
 1;
 __END__
 
+=head1 NAME
+
+Apache::lonacc - Cookie Based Access Handler
+
+=head1 SYNOPSIS
+
+Invoked (for various locations) by /etc/httpd/conf/srm.conf:
+
+ PerlAccessHandler       Apache::lonacc
+
+=head1 INTRODUCTION
+
+This module enables cookie based authentication and is used
+to control access for many different LON-CAPA URIs.
+
+Whenever the client sends the cookie back to the server, 
+this cookie is handled by either lonacc.pm or loncacc.pm
+(see srm.conf for what is invoked when).  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 *
+
+transfer profile into environment
+
+=item *
+
+load POST parameters
+
+=item *
+
+check access
+
+=item *
+
+if allowed, get symb, log, generate course statistics if applicable
+
+=item *
 
+otherwise return error
 
+=item *
 
+see if public resource
 
+=item *
 
+store attempted access
 
+=back
 
+=cut