--- loncom/lonnet/perl/lonnet.pm	2000/10/11 18:15:16	1.43
+++ loncom/lonnet/perl/lonnet.pm	2001/11/16 07:00:07	1.170
@@ -1,8 +1,49 @@
 # The LearningOnline Network
 # TCP networking package
 #
+# 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
+# 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
+# 11/8,11/16,11/18,11/22,11/23,12/22,
+# 01/06,01/13,02/24,02/28,02/29,
+# 03/01,03/02,03/06,03/07,03/13,
+# 04/05,05/29,05/31,06/01,
+# 06/05,06/26 Gerd Kortemeyer
+# 06/26 Ben Tyszka
+# 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
+# 08/14 Ben Tyszka
+# 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
+# 10/04 Gerd Kortemeyer
+# 10/04 Guy Albertelli
+# 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29, 
+# 10/30,10/31,
+# 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
+# 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
+# 05/01/01 Guy Albertelli
+# 05/01,06/01,09/01 Gerd Kortemeyer
+# 09/01 Guy Albertelli
+# 09/01,10/01,11/01 Gerd Kortemeyer
+# YEAR=2001
+# 02/27/01 Scott Harrison
+# 3/2 Gerd Kortemeyer
+# 3/15,3/19 Scott Harrison
+# 3/19,3/20 Gerd Kortemeyer
+# 3/22,3/27,4/2,4/16,4/17 Scott Harrison
+# 5/26,5/28 Gerd Kortemeyer
+# 5/30 H. K. Ng
+# 6/1 Gerd Kortemeyer
+# July Guy Albertelli
+# 8/4,8/7,8/8,8/9,8/11,8/16,8/17,8/18,8/20,8/23,9/20,9/21,9/26,
+# 10/2 Gerd Kortemeyer
+# 10/5,10/10,11/13,11/15 Scott Harrison
+#
+# $Id: lonnet.pm,v 1.170 2001/11/16 07:00:07 harris41 Exp $
+###
+
 # Functions for use by content handlers:
 #
+# metadata_query(sql-query-string,custom-metadata-regex) : 
+#                                    returns file handle of where sql and
+#                                    regex results will be stored for query
 # plaintext(short)   : plain text explanation of short term
 # fileembstyle(ext)  : embed style in page for file extension
 # filedescription(ext) : descriptor text for file extension
@@ -13,7 +54,7 @@
 #                      1: user needs to choose course
 #                      2: browse allowed
 # definerole(rolename,sys,dom,cou) : define a custom role rolename
-#                      set priviledges in format of lonTabs/roles.tab for
+#                      set privileges in format of lonTabs/roles.tab for
 #                      system, domain and course level, 
 # assignrole(udom,uname,url,role,end,start) : give a role to a user for the
 #                      level given by url. Optional start and end dates
@@ -24,13 +65,40 @@
 # revokerole (udom,uname,url,role) : Revoke a role for url
 # revokecustomrole (udom,uname,url,rdom,rnam,rolename) : Revoke a custom role
 # appenv(hash)       : adds hash to session environment
-# store(hash)        : stores hash permanently for this url
-# restore            : returns hash for this url
-# eget(namesp,array) : returns hash with keys from array filled in from namesp
-# get(namesp,array)  : returns hash with keys from array filled in from namesp
-# del(namesp,array)  : deletes keys out of array from namesp
-# put(namesp,hash)   : stores hash in namesp
-# dump(namesp)       : dumps the complete namespace into a hash
+# delenv(varname)    : deletes all environment entries starting with varname
+# store(hashref,symb,courseid,udom,uname)
+#                    : stores hash permanently for this url
+#                      hashref needs to be given, and should be a \%hashname
+#                      the remaining args aren't required and if they aren't
+#                      passed or are '' they will be derived from the ENV
+# cstore(hashref,symb,courseid,udom,uname)
+#                    : same as store but uses the critical interface to 
+#                      guarentee a store
+# restore(symb,courseid,udom,uname)
+#                    : returns hash for this symb, all args are optional
+#                      if they aren't given they will be derived from the 
+#                      current enviroment
+#
+#
+# for the next 6 functions udom and uname are optional
+#         if supplied they use udom as the domain and uname
+#         as the username for the function (supply a courseid
+#         for the uname if you want a course database)
+#         if not supplied it uses %ENV and looks at 
+#         user. attribute for the values
+#
+# eget(namesp,arrayref,udom,uname)
+#                    : returns hash with keys from array  reference filled
+#                      in from namesp (encrypts the return communication)
+# get(namesp,arrayref,udom,uname)
+#                    : returns hash with keys from array  reference filled
+#                      in from namesp
+# dump(namesp,udom,uname) : dumps the complete namespace into a hash
+# del(namesp,array,udom,uname)  : deletes keys out of array from namesp
+# put(namesp,hash,udom,uname)   : stores hash in namesp
+# cput(namesp,hash,udom,uname)  : critical put
+#
+#
 # ssi(url,hash)      : does a complete request cycle on url to localhost, posts
 #                      hash
 # coursedescription(id) : returns and caches course description for id
@@ -39,30 +107,34 @@
 # directcondval(index) : reading condition value of single condition from 
 #                        state string
 # condval(index)     : value of condition index based on state
-# varval(name)       : value of a variable
-# refreshstate()     : refresh the state information string
+# EXT(name)          : value of a variable
 # symblist(map,hash) : Updates symbolic storage links
-# symbread(filename) : returns the data handle
-# rndseed()          : returns a random seed  
+# symbread([filename]) : returns the data handle (filename optional)
+# rndseed([symb,courseid,domain,uname])
+#                    : returns a random seed, all arguments are optional,
+#                      if they aren't sent it use the environment to derive
+#                      them
+#                      Note: if symb isn't sent and it can't get one from
+#                      &symbread it will use the current time as it's return
+# receipt()          : returns a receipt to be given out to users 
 # getfile(filename)  : returns the contents of filename, or a -1 if it can't
 #                      be found, replicates and subscribes to the file
-# filelocation(dir,file) : returns a farily clean absolute reference to file 
+# filelocation(dir,file) : returns a fairly clean absolute reference to file 
 #                          from the directory dir
+# hreflocation(dir,file) : same as filelocation, but for hrefs
+# log(domain,user,home,msg) : write to permanent log for user
+# usection(domain,user,courseid) : output of section name/number or '' for
+#                                  "not in course" and '-1' for "no section"
+# userenvironment(domain,user,what) : puts out any environment parameter 
+#                                     for a user
+# idput(domain,hash) : writes IDs for users from hash (name=>id,name=>id)
+# idget(domain,array): returns hash with usernames (id=>name,id=>name) for
+#                      an array of IDs
+# idrget(domain,array): returns hash with IDs for usernames (name=>id,...) for
+#                       an array of names
+# metadata(file,entry): returns the metadata entry for a file. entry='keys'
+#                       returns a comma separated list of keys
 #
-# 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
-# 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
-# 11/8,11/16,11/18,11/22,11/23,12/22,
-# 01/06,01/13,02/24,02/28,02/29,
-# 03/01,03/02,03/06,03/07,03/13,
-# 04/05,05/29,05/31,06/01,
-# 06/05,06/26 Gerd Kortemeyer
-# 06/26 Ben Tyszka
-# 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
-# 08/14 Ben Tyszka
-# 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
-# 10/04 Gerd Kortemeyer
-# 10/04 Guy Albertelli
-# 10/06,10/09,10/10,10/11 Gerd Kortemeyer
 
 package Apache::lonnet;
 
@@ -71,13 +143,25 @@ use Apache::File;
 use LWP::UserAgent();
 use HTTP::Headers;
 use vars 
-qw(%perlvar %hostname %homecache %spareid %hostdom %libserv %pr %prp %fe %fd $readit);
+qw(%perlvar %hostname %homecache %hostip %spareid %hostdom %libserv %pr %prp %fe %fd $readit %metacache %packagetab %courselogs);
 use IO::Socket;
 use GDBM_File;
 use Apache::Constants qw(:common :http);
+use HTML::TokeParser;
+use Fcntl qw(:flock);
 
 # --------------------------------------------------------------------- Logging
 
+sub logtouch {
+    my $execdir=$perlvar{'lonDaemons'};
+    unless (-e "$execdir/logs/lonnet.log") {
+	my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
+	close $fh;
+    }
+    my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
+    chown($wwwuid,$wwwgid,$execdir.'/logs/lonnet.log');
+}
+
 sub logthis {
     my $message=shift;
     my $execdir=$perlvar{'lonDaemons'};
@@ -117,8 +201,7 @@ sub reply {
     my ($cmd,$server)=@_;
     my $answer=subreply($cmd,$server);
     if ($answer eq 'con_lost') { $answer=subreply($cmd,$server); }
-    if (($answer=~/^error:/) || ($answer=~/^refused/) || 
-        ($answer=~/^rejected/)) {
+    if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
        &logthis("<font color=blue>WARNING:".
                 " $cmd to $server returned $answer</font>");
     }
@@ -158,6 +241,11 @@ sub reconlonc {
 
 sub critical {
     my ($cmd,$server)=@_;
+    unless ($hostname{$server}) {
+        &logthis("<font color=blue>WARNING:".
+               " Critical message to unknown server ($server)</font>");
+        return 'no_such_host';
+    }
     my $answer=reply($cmd,$server);
     if ($answer eq 'con_lost') {
         my $pingreply=reply('ping',$server);
@@ -210,19 +298,33 @@ sub appenv {
     map {
 	if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
             &logthis("<font color=blue>WARNING: ".
-                "Attempt to modify environment ".$_." to ".$newenv{$_});
+                "Attempt to modify environment ".$_." to ".$newenv{$_}
+                .'</font>');
 	    delete($newenv{$_});
         } else {
             $ENV{$_}=$newenv{$_};
         }
     } keys %newenv;
+
+    my $lockfh;
+    unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {
+       return 'error: '.$!;
+    }
+    unless (flock($lockfh,LOCK_EX)) {
+         &logthis("<font color=blue>WARNING: ".
+                  'Could not obtain exclusive lock in appenv: '.$!);
+         $lockfh->close();
+         return 'error: '.$!;
+    }
+
     my @oldenv;
     {
      my $fh;
      unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
-	return 'error';
+	return 'error: '.$!;
      }
      @oldenv=<$fh>;
+     $fh->close();
     }
     for (my $i=0; $i<=$#oldenv; $i++) {
         chomp($oldenv[$i]);
@@ -242,6 +344,52 @@ sub appenv {
      foreach $newname (keys %newenv) {
 	 print $fh "$newname=$newenv{$newname}\n";
      }
+     $fh->close();
+    }
+
+    $lockfh->close();
+    return 'ok';
+}
+# ----------------------------------------------------- Delete from Environment
+
+sub delenv {
+    my $delthis=shift;
+    my %newenv=();
+    if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
+        &logthis("<font color=blue>WARNING: ".
+                "Attempt to delete from environment ".$delthis);
+        return 'error';
+    }
+    my @oldenv;
+    {
+     my $fh;
+     unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
+	return 'error';
+     }
+     unless (flock($fh,LOCK_SH)) {
+         &logthis("<font color=blue>WARNING: ".
+                  'Could not obtain shared lock in delenv: '.$!);
+         $fh->close();
+         return 'error: '.$!;
+     }
+     @oldenv=<$fh>;
+     $fh->close();
+    }
+    {
+     my $fh;
+     unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
+	return 'error';
+     }
+     unless (flock($fh,LOCK_EX)) {
+         &logthis("<font color=blue>WARNING: ".
+                  'Could not obtain exclusive lock in delenv: '.$!);
+         $fh->close();
+         return 'error: '.$!;
+     }
+     map {
+	 unless ($_=~/^$delthis/) { print $fh $_; }
+     } @oldenv;
+     $fh->close();
     }
     return 'ok';
 }
@@ -262,6 +410,44 @@ sub spareserver {
     return $spareserver;
 }
 
+# ----------------------- Try to determine user's current authentication scheme
+
+sub queryauthenticate {
+    my ($uname,$udom)=@_;
+    if (($perlvar{'lonRole'} eq 'library') && 
+        ($udom eq $perlvar{'lonDefDomain'})) {
+	my $answer=reply("encrypt:currentauth:$udom:$uname",
+			 $perlvar{'lonHostID'});
+	unless ($answer eq 'unknown_user' or $answer eq 'refused') {
+	    if (length($answer)) {
+		return $answer;
+	    }
+	    else {
+	&logthis("User $uname at $udom lacks an authentication mechanism");
+		return 'no_host';
+	    }
+	}
+    }
+
+    my $tryserver;
+    foreach $tryserver (keys %libserv) {
+	if ($hostdom{$tryserver} eq $udom) {
+           my $answer=reply("encrypt:currentauth:$udom:$uname",$tryserver);
+	   unless ($answer eq 'unknown_user' or $answer eq 'refused') {
+	       if (length($answer)) {
+		   return $answer;
+	       }
+	       else {
+	   &logthis("User $uname at $udom lacks an authentication mechanism");
+		   return 'no_host';
+	       }
+	   }
+       }
+    }
+    &logthis("User $uname at $udom lacks an authentication mechanism");    
+    return 'no_host';
+}
+
 # --------- Try to authenticate user from domain's lib servers (first this one)
 
 sub authenticate {
@@ -323,6 +509,111 @@ sub homeserver {
     return 'no_host';
 }
 
+# ------------------------------------- Find the usernames behind a list of IDs
+
+sub idget {
+    my ($udom,@ids)=@_;
+    my %returnhash=();
+    
+    my $tryserver;
+    foreach $tryserver (keys %libserv) {
+       if ($hostdom{$tryserver} eq $udom) {
+	  my $idlist=join('&',@ids);
+          $idlist=~tr/A-Z/a-z/; 
+	  my $reply=&reply("idget:$udom:".$idlist,$tryserver);
+          my @answer=();
+          if (($reply ne 'con_lost') && ($reply!~/^error\:/)) {
+	      @answer=split(/\&/,$reply);
+          }                    ;
+          my $i;
+          for ($i=0;$i<=$#ids;$i++) {
+              if ($answer[$i]) {
+		  $returnhash{$ids[$i]}=$answer[$i];
+              } 
+          }
+       }
+    }    
+    return %returnhash;
+}
+
+# ------------------------------------- Find the IDs behind a list of usernames
+
+sub idrget {
+    my ($udom,@unames)=@_;
+    my %returnhash=();
+    map {
+        $returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
+    } @unames;
+    return %returnhash;
+}
+
+# ------------------------------- Store away a list of names and associated IDs
+
+sub idput {
+    my ($udom,%ids)=@_;
+    my %servers=();
+    map {
+        my $uhom=&homeserver($_,$udom);
+        if ($uhom ne 'no_host') {
+            my $id=&escape($ids{$_});
+            $id=~tr/A-Z/a-z/;
+            my $unam=&escape($_);
+	    if ($servers{$uhom}) {
+		$servers{$uhom}.='&'.$id.'='.$unam;
+            } else {
+                $servers{$uhom}=$id.'='.$unam;
+            }
+            &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
+        }
+    } keys %ids;
+    map {
+        &critical('idput:'.$udom.':'.$servers{$_},$_);
+    } keys %servers;
+}
+
+# ------------------------------------- Find the section of student in a course
+
+sub usection {
+    my ($udom,$unam,$courseid)=@_;
+    $courseid=~s/\_/\//g;
+    $courseid=~s/^(\w)/\/$1/;
+    map {
+        my ($key,$value)=split(/\=/,$_);
+        $key=&unescape($key);
+        if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
+            my $section=$1;
+            if ($key eq $courseid.'_st') { $section=''; }
+	    my ($dummy,$end,$start)=split(/\_/,&unescape($value));
+            my $now=time;
+            my $notactive=0;
+            if ($start) {
+		if ($now<$start) { $notactive=1; }
+            }
+            if ($end) {
+                if ($now>$end) { $notactive=1; }
+            } 
+            unless ($notactive) { return $section; }
+        }
+    } split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
+                        &homeserver($unam,$udom)));
+    return '-1';
+}
+
+# ------------------------------------- Read an entry from a user's environment
+
+sub userenvironment {
+    my ($udom,$unam,@what)=@_;
+    my %returnhash=();
+    my @answer=split(/\&/,
+                &reply('get:'.$udom.':'.$unam.':environment:'.join('&',@what),
+                      &homeserver($unam,$udom)));
+    my $i;
+    for ($i=0;$i<=$#what;$i++) {
+	$returnhash{$what[$i]}=&unescape($answer[$i]);
+    }
+    return %returnhash;
+}
+
 # ----------------------------- Subscribe to a resource, return URL if possible
 
 sub subscribe {
@@ -335,6 +626,9 @@ sub subscribe {
         return 'not_found'; 
     }
     my $answer=reply("sub:$fname",$home);
+    if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
+	$answer.=' by '.$home;
+    }
     return $answer;
 }
     
@@ -346,14 +640,14 @@ sub repcopy {
     my $transname="$filename.in.transfer";
     if ((-e $filename) || (-e $transname)) { return OK; }
     my $remoteurl=subscribe($filename);
-    if ($remoteurl eq 'con_lost') {
-	   &logthis("Subscribe returned con_lost: $filename");
+    if ($remoteurl =~ /^con_lost by/) {
+	   &logthis("Subscribe returned $remoteurl: $filename");
            return HTTP_SERVICE_UNAVAILABLE;
     } elsif ($remoteurl eq 'not_found') {
 	   &logthis("Subscribe returned not_found: $filename");
 	   return HTTP_NOT_FOUND;
-    } elsif ($remoteurl eq 'rejected') {
-	   &logthis("Subscribe returned rejected: $filename");
+    } elsif ($remoteurl =~ /^rejected by/) {
+	   &logthis("Subscribe returned $remoteurl: $filename");
            return FORBIDDEN;
     } elsif ($remoteurl eq 'directory') {
            return OK;
@@ -423,45 +717,408 @@ sub ssi {
 
 sub log {
     my ($dom,$nam,$hom,$what)=@_;
-    return reply("log:$dom:$nam:$what",$hom);
+    return critical("log:$dom:$nam:$what",$hom);
+}
+
+# ------------------------------------------------------------------ Course Log
+
+sub flushcourselogs {
+    &logthis('Flushing course log buffers');
+    map {
+        my $crsid=$_;
+        if (&reply('log:'.$ENV{'course.'.$crsid.'.domain'}.':'.
+		          $ENV{'course.'.$crsid.'.num'}.':'.
+		           &escape($courselogs{$crsid}),
+		          $ENV{'course.'.$crsid.'.home'}) eq 'ok') {
+	    delete $courselogs{$crsid};
+        } else {
+            &logthis('Failed to flush log buffer for '.$crsid);
+            if (length($courselogs{$crsid})>40000) {
+               &logthis("<font color=blue>WARNING: Buffer for ".$crsid.
+                        " exceeded maximum size, deleting.</font>");
+               delete $courselogs{$crsid};
+            }
+        }        
+    } keys %courselogs;
+}
+
+sub courselog {
+    my $what=shift;
+    $what=time.':'.$what;
+    unless ($ENV{'request.course.id'}) { return ''; }
+    if (defined $courselogs{$ENV{'request.course.id'}}) {
+	$courselogs{$ENV{'request.course.id'}}.='&'.$what;
+    } else {
+	$courselogs{$ENV{'request.course.id'}}.=$what;
+    }
+    if (length($courselogs{$ENV{'request.course.id'}})>4048) {
+	&flushcourselogs();
+    }
+}
+
+sub courseacclog {
+    my $fnsymb=shift;
+    unless ($ENV{'request.course.id'}) { return ''; }
+    my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
+    if ($what=~/(problem|exam|quiz|assess|survey|form)$/) {
+	map {
+            if ($_=~/^form\.(.*)/) {
+		$what.=':'.$1.'='.$ENV{$_};
+            }
+        } keys %ENV;
+    }
+    &courselog($what);
+}
+
+# ----------------------------------------------------------- Check out an item
+
+sub checkout {
+    my ($symb,$tuname,$tudom,$tcrsid)=@_;
+    my $now=time;
+    my $lonhost=$perlvar{'lonHostID'};
+    my $infostr=&escape(
+                 $tuname.'&'.
+                 $tudom.'&'.
+                 $tcrsid.'&'.
+                 $symb.'&'.
+		 $now.'&'.$ENV{'REMOTE_ADDR'});
+    my $token=&reply('tmpput:'.$infostr,$lonhost);
+    if ($token=~/^error\:/) { 
+        &logthis("<font color=blue>WARNING: ".
+                "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
+                 "</font>");
+        return ''; 
+    }
+
+    $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
+    $token=~tr/a-z/A-Z/;
+
+    my %infohash=('resource.0.outtoken' => $token,
+                  'resource.0.checkouttime' => $now,
+                  'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
+
+    unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
+       return '';
+    } else {
+        &logthis("<font color=blue>WARNING: ".
+                "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
+                 "</font>");
+    }    
+
+    if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
+                         &escape('Checkout '.$infostr.' - '.
+                                                 $token)) ne 'ok') {
+	return '';
+    } else {
+        &logthis("<font color=blue>WARNING: ".
+                "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
+                 "</font>");
+    }
+    return $token;
+}
+
+# ------------------------------------------------------------ Check in an item
+
+sub checkin {
+    my $token=shift;
+    my $now=time;
+    my ($ta,$tb,$lonhost)=split(/\*/,$token);
+    $lonhost=~tr/A-Z/a-z/;
+    my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
+    $dtoken=~s/\W/\_/g;
+    my ($tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
+                 split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
+
+    unless (($tuname) && ($tudom)) {
+        &logthis('Check in '.$token.' ('.$dtoken.') failed');
+        return '';
+    }
+    
+    unless (&allowed('mgr',$tcrsid)) {
+        &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
+                 $ENV{'user.name'}.' - '.$ENV{'user.domain'});
+        return '';
+    }
+
+    my %infohash=('resource.0.intoken' => $token,
+                  'resource.0.checkintime' => $now,
+                  'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
+
+    unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
+       return '';
+    }    
+
+    if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
+                         &escape('Checkin - '.$token)) ne 'ok') {
+	return '';
+    }
+
+    return ($symb,$tuname,$tudom,$tcrsid);    
+}
+
+# --------------------------------------------- Set Expire Date for Spreadsheet
+
+sub expirespread {
+    my ($uname,$udom,$stype,$usymb)=@_;
+    my $cid=$ENV{'request.course.id'}; 
+    if ($cid) {
+       my $now=time;
+       my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
+       return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
+                            $ENV{'course.'.$cid.'.num'}.
+	        	    ':nohist_expirationdates:'.
+                            &escape($key).'='.$now,
+                            $ENV{'course.'.$cid.'.home'})
+    }
+    return 'ok';
+}
+
+# ----------------------------------------------------- Devalidate Spreadsheets
+
+sub devalidate {
+    my $symb=shift;
+    my $cid=$ENV{'request.course.id'}; 
+    if ($cid) {
+	my $key=$ENV{'user.name'}.':'.$ENV{'user.domain'}.':';
+        my $status=
+	    &del('nohist_calculatedsheet',
+		 [$key.'studentcalc'],
+		 $ENV{'course.'.$cid.'.domain'},
+		 $ENV{'course.'.$cid.'.num'})
+		.' '.
+	    &del('nohist_calculatedsheets_'.$cid,
+		 [$key.'assesscalc:'.$symb]);
+        unless ($status eq 'ok ok') {
+           &logthis('Could not devalidate spreadsheet '.
+                    $ENV{'user.name'}.' at '.$ENV{'user.domain'}.' for '.
+		    $symb.': '.$status);
+        }
+    }
+}
+
+sub hash2str {
+  my (%hash)=@_;
+  my $result='';
+  map { $result.=escape($_).'='.escape($hash{$_}).'&'; } keys %hash;
+  $result=~s/\&$//;
+  return $result;
+}
+
+sub str2hash {
+  my ($string) = @_;
+  my %returnhash;
+  map {
+    my ($name,$value)=split(/\=/,$_);
+    $returnhash{&unescape($name)}=&unescape($value);
+  } split(/\&/,$string);
+  return %returnhash;
+}
+
+# -------------------------------------------------------------------Temp Store
+
+sub tmpreset {
+  my ($symb,$namespace,$domain,$stuname) = @_;
+  if (!$symb) {
+    $symb=&symbread();
+    if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }
+  }
+  $symb=escape($symb);
+
+  if (!$namespace) { $namespace=$ENV{'request.state'}; }
+  $namespace=~s/\//\_/g;
+  $namespace=~s/\W//g;
+
+  #FIXME needs to do something for /pub resources
+  if (!$domain) { $domain=$ENV{'user.domain'}; }
+  if (!$stuname) { $stuname=$ENV{'user.name'}; }
+  my $path=$perlvar{'lonDaemons'}.'/tmp';
+  my %hash;
+  if (tie(%hash,'GDBM_File',
+	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
+	  &GDBM_WRCREAT,0640)) {
+    foreach my $key (keys %hash) {
+      if ($key=~ /:$symb:/) {
+	delete($hash{$key});
+      }
+    }
+  }
+}
+
+sub tmpstore {
+  my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
+
+  if (!$symb) {
+    $symb=&symbread();
+    if (!$symb) { $symb= $ENV{'request.url'}; }
+  }
+  $symb=escape($symb);
+
+  if (!$namespace) {
+    # I don't think we would ever want to store this for a course.
+    # it seems this will only be used if we don't have a course.
+    #$namespace=$ENV{'request.course.id'};
+    #if (!$namespace) {
+      $namespace=$ENV{'request.state'};
+    #}
+  }
+  $namespace=~s/\//\_/g;
+  $namespace=~s/\W//g;
+#FIXME needs to do something for /pub resources
+  if (!$domain) { $domain=$ENV{'user.domain'}; }
+  if (!$stuname) { $stuname=$ENV{'user.name'}; }
+  my $now=time;
+  my %hash;
+  my $path=$perlvar{'lonDaemons'}.'/tmp';
+  if (tie(%hash,'GDBM_File',
+	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
+	  &GDBM_WRCREAT,0640)) {
+    $hash{"version:$symb"}++;
+    my $version=$hash{"version:$symb"};
+    my $allkeys=''; 
+    foreach my $key (keys(%$storehash)) {
+      $allkeys.=$key.':';
+      $hash{"$version:$symb:$key"}=$$storehash{$key};
+    }
+    $hash{"$version:$symb:timestamp"}=$now;
+    $allkeys.='timestamp';
+    $hash{"$version:keys:$symb"}=$allkeys;
+    if (untie(%hash)) {
+      return 'ok';
+    } else {
+      return "error:$!";
+    }
+  } else {
+    return "error:$!";
+  }
+}
+
+# -----------------------------------------------------------------Temp Restore
+
+sub tmprestore {
+  my ($symb,$namespace,$domain,$stuname) = @_;
+
+  if (!$symb) {
+    $symb=&symbread();
+    if (!$symb) { $symb= $ENV{'request.url'}; }
+  }
+  $symb=escape($symb);
+
+  if (!$namespace) { $namespace=$ENV{'request.state'}; }
+  #FIXME needs to do something for /pub resources
+  if (!$domain) { $domain=$ENV{'user.domain'}; }
+  if (!$stuname) { $stuname=$ENV{'user.name'}; }
+
+  my %returnhash;
+  $namespace=~s/\//\_/g;
+  $namespace=~s/\W//g;
+  my %hash;
+  my $path=$perlvar{'lonDaemons'}.'/tmp';
+  if (tie(%hash,'GDBM_File',
+	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
+	  &GDBM_READER,0640)) {
+    my $version=$hash{"version:$symb"};
+    $returnhash{'version'}=$version;
+    my $scope;
+    for ($scope=1;$scope<=$version;$scope++) {
+      my $vkeys=$hash{"$scope:keys:$symb"};
+      my @keys=split(/:/,$vkeys);
+      my $key;
+      $returnhash{"$scope:keys"}=$vkeys;
+      foreach $key (@keys) {
+	$returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
+	$returnhash{"$key"}=$hash{"$scope:$symb:$key"};
+      }
+    }
+    if (!(untie(%hash))) {
+      return "error:$!";
+    }
+  } else {
+    return "error:$!";
+  }
+  return %returnhash;
 }
 
 # ----------------------------------------------------------------------- Store
 
 sub store {
-    my %storehash=@_;
-    my $symb;
-    unless ($symb=escape(&symbread($ENV{'request.filename'}))) { return ''; }
-    my $namespace;
-    unless ($namespace=$ENV{'request.course.id'}) { return ''; }
+    my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
+    my $home='';
+
+    if ($stuname) { $home=&homeserver($stuname,$domain); }
+
+    if (!$symb) { unless ($symb=&symbread()) { return ''; } }
+
+    &devalidate($symb);
+
+    $symb=escape($symb);
+    if (!$namespace) { unless ($namespace=$ENV{'request.course.id'}) { return ''; } }
+    if (!$domain) { $domain=$ENV{'user.domain'}; }
+    if (!$stuname) { $stuname=$ENV{'user.name'}; }
+    if (!$home) { $home=$ENV{'user.home'}; }
+    my $namevalue='';
+    map {
+        $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
+    } keys %$storehash;
+    $namevalue=~s/\&$//;
+    return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
+}
+
+# -------------------------------------------------------------- Critical Store
+
+sub cstore {
+    my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
+    my $home='';
+
+    if ($stuname) { $home=&homeserver($stuname,$domain); }
+
+    if (!$symb) { unless ($symb=&symbread()) { return ''; } }
+
+    &devalidate($symb);
+
+    $symb=escape($symb);
+    if (!$namespace) { unless ($namespace=$ENV{'request.course.id'}) { return ''; } }
+    if (!$domain) { $domain=$ENV{'user.domain'}; }
+    if (!$stuname) { $stuname=$ENV{'user.name'}; }
+    if (!$home) { $home=$ENV{'user.home'}; }
+
     my $namevalue='';
     map {
-        $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
-    } keys %storehash;
+        $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
+    } keys %$storehash;
     $namevalue=~s/\&$//;
-    return reply(
-     "store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
-		 "$ENV{'user.home'}");
+    return critical("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
 }
 
 # --------------------------------------------------------------------- Restore
 
 sub restore {
-    my $symb;
-    unless ($symb=escape(&symbread($ENV{'request.filename'}))) { return ''; }
-    my $namespace;
-    unless ($namespace=$ENV{'request.course.id'}) { return ''; }
-    my $answer=reply(
-              "restore:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb",
-              "$ENV{'user.home'}");
+    my ($symb,$namespace,$domain,$stuname) = @_;
+    my $home='';
+
+    if ($stuname) { $home=&homeserver($stuname,$domain); }
+
+    if (!$symb) {
+      unless ($symb=escape(&symbread())) { return ''; }
+    } else {
+      $symb=&escape($symb);
+    }
+    if (!$namespace) { unless ($namespace=$ENV{'request.course.id'}) { return ''; } }
+    if (!$domain) { $domain=$ENV{'user.domain'}; }
+    if (!$stuname) { $stuname=$ENV{'user.name'}; }
+    if (!$home) { $home=$ENV{'user.home'}; }
+    my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
+
     my %returnhash=();
     map {
 	my ($name,$value)=split(/\=/,$_);
         $returnhash{&unescape($name)}=&unescape($value);
     } split(/\&/,$answer);
-    map {
-        $returnhash{$_}=$returnhash{$returnhash{'version'}.':'.$_};
-    } split(/\:/,$returnhash{$returnhash{'version'}.':keys'});
+    my $version;
+    for ($version=1;$version<=$returnhash{'version'};$version++) {
+       map {
+          $returnhash{$_}=$returnhash{$version.':'.$_};
+       } split(/\:/,$returnhash{$version.':keys'});
+    }
     return %returnhash;
 }
 
@@ -470,35 +1127,35 @@ sub restore {
 sub coursedescription {
     my $courseid=shift;
     $courseid=~s/^\///;
+    $courseid=~s/\_/\//g;
     my ($cdomain,$cnum)=split(/\//,$courseid);
-    my $chome=homeserver($cnum,$cdomain);
+    my $chome=&homeserver($cnum,$cdomain);
     if ($chome ne 'no_host') {
-       my $rep=reply("dump:$cdomain:$cnum:environment",$chome);
-       if ($rep ne 'con_lost') {
-	   my %cachehash=();
-           my %returnhash=('home'   => $chome, 
-                           'domain' => $cdomain,
-                           'num'    => $cnum);
-           map {
-               my ($name,$value)=split(/\=/,$_);
-               $name=&unescape($name);
-               $value=&unescape($value);
-               $returnhash{$name}=$value;
-               if ($name eq 'description') {
-		   $cachehash{$courseid}=$value;
-               }
-           } split(/\&/,$rep);
+       my %returnhash=&dump('environment',$cdomain,$cnum);
+       if (!exists($returnhash{'con_lost'})) {
+           my $normalid=$cdomain.'_'.$cnum;
+           my %envhash=();
+           $returnhash{'home'}= $chome;
+	   $returnhash{'domain'} = $cdomain;
+	   $returnhash{'num'} = $cnum;
+           while (my ($name,$value) = each %returnhash) {
+               $envhash{'course.'.$normalid.'.'.$name}=$value;
+           }
            $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
            $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
 	       $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
-	   put ('coursedescriptions',%cachehash);
+           $envhash{'course.'.$normalid.'.last_cache'}=time;
+           $envhash{'course.'.$normalid.'.home'}=$chome;
+           $envhash{'course.'.$normalid.'.domain'}=$cdomain;
+           $envhash{'course.'.$normalid.'.num'}=$cnum;
+           &appenv(%envhash);
            return %returnhash;
        }
     }
     return ();
 }
 
-# -------------------------------------------------------- Get user priviledges
+# -------------------------------------------------------- Get user privileges
 
 sub rolesinit {
     my ($domain,$username,$authhost)=@_;
@@ -529,6 +1186,7 @@ sub rolesinit {
                 }
             }
             if (($area ne '') && ($trole ne '')) {
+	       my $spec=$trole.'.'.$area;
                my ($tdummy,$tdomain,$trest)=split(/\//,$area);
                if ($trole =~ /^cr\//) {
 		   my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
@@ -540,37 +1198,47 @@ sub rolesinit {
                       if (($roledef ne 'con_lost') && ($roledef ne '')) {
                          my ($syspriv,$dompriv,$coursepriv)=
 			     split(/\_/,unescape($roledef));
- 	                 $allroles{'/'}.=':'.$syspriv;
+ 	                 $allroles{'cm./'}.=':'.$syspriv;
+                         $allroles{$spec.'./'}.=':'.$syspriv;
                          if ($tdomain ne '') {
-                             $allroles{'/'.$tdomain.'/'}.=':'.$dompriv;
+                             $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
+                             $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
                              if ($trest ne '') {
-		                $allroles{$area}.=':'.$coursepriv;
+		                $allroles{'cm.'.$area}.=':'.$coursepriv;
+		                $allroles{$spec.'.'.$area}.=':'.$coursepriv;
                              }
 	                 }
                       }
                    }
                } else {
-	           $allroles{'/'}.=':'.$pr{$trole.':s'};
+	           $allroles{'cm./'}.=':'.$pr{$trole.':s'};
+	           $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
                    if ($tdomain ne '') {
-                      $allroles{'/'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
+                     $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
+                     $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
                       if ($trest ne '') {
-		          $allroles{$area}.=':'.$pr{$trole.':c'};
+		          $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
+		          $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
                       }
 	           }
 	       }
             }
           } 
         } split(/&/,$rolesdump);
+        my $adv=0;
+        my $author=0;
         map {
             %thesepriv=();
+            if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
+            if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
             map {
                 if ($_ ne '') {
-		    my ($priviledge,$restrictions)=split(/&/,$_);
+		    my ($privilege,$restrictions)=split(/&/,$_);
                     if ($restrictions eq '') {
-			$thesepriv{$priviledge}='F';
+			$thesepriv{$privilege}='F';
                     } else {
-                        if ($thesepriv{$priviledge} ne 'F') {
-			    $thesepriv{$priviledge}.=$restrictions;
+                        if ($thesepriv{$privilege} ne 'F') {
+			    $thesepriv{$privilege}.=$restrictions;
                         }
                     }
                 }
@@ -579,6 +1247,9 @@ sub rolesinit {
             map { $thesestr.=':'.$_.'&'.$thesepriv{$_}; } keys %thesepriv;
             $userroles.='user.priv.'.$_.'='.$thesestr."\n";
         } keys %allroles;            
+        $userroles.='user.adv='.$adv."\n".
+	            'user.author='.$author."\n";
+        $ENV{'user.adv'}=$adv;
     }
     return $userroles;  
 }
@@ -586,43 +1257,51 @@ sub rolesinit {
 # --------------------------------------------------------------- get interface
 
 sub get {
-   my ($namespace,@storearr)=@_;
+   my ($namespace,$storearr,$udomain,$uname)=@_;
    my $items='';
    map {
        $items.=escape($_).'&';
-   } @storearr;
+   } @$storearr;
    $items=~s/\&$//;
- my $rep=reply("get:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
-                 $ENV{'user.home'});
+   if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+   if (!$uname) { $uname=$ENV{'user.name'}; }
+   my $uhome=&homeserver($uname,$udomain);
+
+   my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
    my @pairs=split(/\&/,$rep);
    my %returnhash=();
    my $i=0;
    map {
       $returnhash{$_}=unescape($pairs[$i]);
       $i++;
-   } @storearr;
+   } @$storearr;
    return %returnhash;
 }
 
 # --------------------------------------------------------------- del interface
 
 sub del {
-   my ($namespace,@storearr)=@_;
+   my ($namespace,$storearr,$udomain,$uname)=@_;
    my $items='';
    map {
        $items.=escape($_).'&';
-   } @storearr;
+   } @$storearr;
    $items=~s/\&$//;
-   return reply("del:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
-                 $ENV{'user.home'});
+   if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+   if (!$uname) { $uname=$ENV{'user.name'}; }
+   my $uhome=&homeserver($uname,$udomain);
+
+   return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
 }
 
 # -------------------------------------------------------------- dump interface
 
 sub dump {
-   my $namespace=shift;
-   my $rep=reply("dump:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace",
-                $ENV{'user.home'});
+   my ($namespace,$udomain,$uname)=@_;
+   if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+   if (!$uname) { $uname=$ENV{'user.name'}; }
+   my $uhome=&homeserver($uname,$udomain);
+   my $rep=reply("dump:$udomain:$uname:$namespace",$uhome);
    my @pairs=split(/\&/,$rep);
    my %returnhash=();
    map {
@@ -635,146 +1314,304 @@ sub dump {
 # --------------------------------------------------------------- put interface
 
 sub put {
-   my ($namespace,%storehash)=@_;
+   my ($namespace,$storehash,$udomain,$uname)=@_;
+   if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+   if (!$uname) { $uname=$ENV{'user.name'}; }
+   my $uhome=&homeserver($uname,$udomain);
    my $items='';
    map {
-       $items.=escape($_).'='.escape($storehash{$_}).'&';
-   } keys %storehash;
+       $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
+   } keys %$storehash;
    $items=~s/\&$//;
-   return reply("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
-                 $ENV{'user.home'});
+   return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
+}
+
+# ------------------------------------------------------ critical put interface
+
+sub cput {
+   my ($namespace,$storehash,$udomain,$uname)=@_;
+   if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+   if (!$uname) { $uname=$ENV{'user.name'}; }
+   my $uhome=&homeserver($uname,$udomain);
+   my $items='';
+   map {
+       $items.=escape($_).'='.escape($$storehash{$_}).'&';
+   } keys %$storehash;
+   $items=~s/\&$//;
+   return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
 }
 
 # -------------------------------------------------------------- eget interface
 
 sub eget {
-   my ($namespace,@storearr)=@_;
+   my ($namespace,$storearr,$udomain,$uname)=@_;
    my $items='';
    map {
        $items.=escape($_).'&';
-   } @storearr;
+   } @$storearr;
    $items=~s/\&$//;
- my $rep=reply("eget:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
-                 $ENV{'user.home'});
+   if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+   if (!$uname) { $uname=$ENV{'user.name'}; }
+   my $uhome=&homeserver($uname,$udomain);
+   my $rep=&reply("eget:$udomain:$uname:$namespace:$items",$uhome);
    my @pairs=split(/\&/,$rep);
    my %returnhash=();
    my $i=0;
    map {
       $returnhash{$_}=unescape($pairs[$i]);
       $i++;
-   } @storearr;
+   } @$storearr;
    return %returnhash;
 }
 
-# ------------------------------------------------- Check for a user priviledge
+# ------------------------------------------------- Check for a user privilege
 
 sub allowed {
     my ($priv,$uri)=@_;
-    $uri=~s/^\/res//;
-    $uri=~s/^\///;
 
-# Free bre access to adm resources
+    my $orguri=$uri;
+    $uri=&declutter($uri);
+
+# Free bre access to adm and meta resources
 
-    if (($uri=~/^adm\//) && ($priv eq 'bre')) {
+    if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
 	return 'F';
     }
 
-# Gather priviledges over system and domain
+# Free bre to public access
+
+    if ($priv eq 'bre') {
+	if (&metadata($uri,'copyright') eq 'public') { return 'F'; }
+    }
 
     my $thisallowed='';
-    if ($ENV{'user.priv./'}=~/$priv\&([^\:]*)/) {
+    my $statecond=0;
+    my $courseprivid='';
+
+# Course
+
+    if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
+       $thisallowed.=$1;
+    }
+
+# Domain
+
+    if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
+       =~/$priv\&([^\:]*)/) {
        $thisallowed.=$1;
     }
-    if ($ENV{'user.priv./'.(split(/\//,$uri))[0].'/'}=~/$priv\&([^\:]*)/) {
+
+# Course: uri itself is a course
+    my $courseuri=$uri;
+    $courseuri=~s/\_(\d)/\/$1/;
+    $courseuri=~s/^([^\/])/\/$1/;
+
+    if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
+       =~/$priv\&([^\:]*)/) {
        $thisallowed.=$1;
     }
 
-# Full access at system or domain level? Exit.
+# Full access at system, domain or course-wide level? Exit.
 
     if ($thisallowed=~/F/) {
 	return 'F';
     }
 
-# The user does not have full access at system or domain level
-# Course level access control
+# If this is generating or modifying users, exit with special codes
 
-# uri itself refering to a course?
-    
-    if ($uri=~/\.course$/) {
-       if ($ENV{'user.priv./'.$uri}=~/$priv\&([^\:]*)/) {
-          $thisallowed.=$1;
+    if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
+	return $thisallowed;
+    }
+#
+# Gathered so far: system, domain and course wide privileges
+#
+# Course: See if uri or referer is an individual resource that is part of 
+# the course
+
+    if ($ENV{'request.course.id'}) {
+       $courseprivid=$ENV{'request.course.id'};
+       if ($ENV{'request.course.sec'}) {
+          $courseprivid.='/'.$ENV{'request.course.sec'};
        }
-# Full access on course level? Exit.
-       if ($thisallowed=~/F/) {
-	  return 'F';
+       $courseprivid=~s/\_/\//;
+       my $checkreferer=1;
+       my @uriparts=split(/\//,$uri);
+       my $filename=$uriparts[$#uriparts];
+       my $pathname=$uri;
+       $pathname=~s/\/$filename$//;
+       if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
+           /\&$filename\:([\d\|]+)\&/) {
+           $statecond=$1;
+           if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
+               =~/$priv\&([^\:]*)/) {
+               $thisallowed.=$1;
+               $checkreferer=0;
+           }
        }
+       
+       if ($checkreferer) {
+	  my $refuri=$ENV{'httpref.'.$orguri};
 
-# uri is refering to an individual resource; user needs to be in a course
+            unless ($refuri) {
+                map {
+		    if ($_=~/^httpref\..*\*/) {
+			my $pattern=$_;
+                        $pattern=~s/^httpref\.\/res\///;
+                        $pattern=~s/\*/\[\^\/\]\+/g;
+                        $pattern=~s/\//\\\//g;
+                        if ($orguri=~/$pattern/) {
+			    $refuri=$ENV{$_};
+                        }
+                    }
+                } keys %ENV;
+            }
+         if ($refuri) { 
+	  $refuri=&declutter($refuri);
+          my @uriparts=split(/\//,$refuri);
+          my $filename=$uriparts[$#uriparts];
+          my $pathname=$refuri;
+          $pathname=~s/\/$filename$//;
+            if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
+              /\&$filename\:([\d\|]+)\&/) {
+              my $refstatecond=$1;
+              if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
+                  =~/$priv\&([^\:]*)/) {
+                  $thisallowed.=$1;
+                  $uri=$refuri;
+                  $statecond=$refstatecond;
+              }
+          }
+        }
+       }
+   }
 
-   } else {
+#
+# Gathered now: all privileges that could apply, and condition number
+# 
+#
+# Full or no access?
+#
 
-       unless(defined($ENV{'request.course.id'})) {
-	   return '1';
-       }
+    if ($thisallowed=~/F/) {
+	return 'F';
+    }
 
-# Get access priviledges for course
+    unless ($thisallowed) {
+        return '';
+    }
 
-       if ($ENV{'user.priv./'.$ENV{'request.course.id'}}=~/$priv\&([^\:]*)/) {
-          $thisallowed.=$1;
-       }
+# Restrictions exist, deal with them
+#
+#   C:according to course preferences
+#   R:according to resource settings
+#   L:unless locked
+#   X:according to user session state
+#
 
-# See if resource or referer is part of this course
-          
-       my @uriparts=split(/\//,$uri);
-       my $urifile=$uriparts[$#uriparts];
-       $urifile=~/\.(\w+)$/;
-       my $uritype=$1;
-       $#uriparts--;
-       my $uripath=join('/',@uriparts);
-       my $uricond=-1;
-       if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$uripath}=~
-	   /\&$urifile\:(\d+)\&/) {
-	   $uricond=$1;
-       } elsif (($fe{$uritype} eq 'emb') || ($fe{$uritype} eq 'img')) {
-	  my $refuri=$ENV{'HTTP_REFERER'};
-          $refuri=~s/^\/res//;
-          $refuri=~s/^\///;
-          @uriparts=split(/\//,$refuri);
-          $urifile=$uriparts[$#uriparts];
-          $#uriparts--;
-          $uripath=join('/',@uriparts);
-          if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$uripath}=~
-	     /\&$urifile\:(\d+)\&/) {
-	     $uricond=$1;
-	  }
+# Possibly locked functionality, check all courses
+# Locks might take effect only after 10 minutes cache expiration for other
+# courses, and 2 minutes for current course
+
+    my $envkey;
+    if ($thisallowed=~/L/) {
+        foreach $envkey (keys %ENV) {
+           if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
+               my $courseid=$2;
+               my $roleid=$1.'.'.$2;
+               $courseid=~s/^\///;
+               my $expiretime=600;
+               if ($ENV{'request.role'} eq $roleid) {
+		  $expiretime=120;
+               }
+	       my ($cdom,$cnum,$csec)=split(/\//,$courseid);
+               my $prefix='course.'.$cdom.'_'.$cnum.'.';
+               if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
+		   &coursedescription($courseid);
+               }
+               if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
+                || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
+		   if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
+                       &log($ENV{'user.domain'},$ENV{'user.name'},
+                            $ENV{'user.host'},
+                            'Locked by res: '.$priv.' for '.$uri.' due to '.
+                            $cdom.'/'.$cnum.'/'.$csec.' expire '.
+                            $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
+		       return '';
+                   }
+               }
+               if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
+                || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
+		   if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
+                       &log($ENV{'user.domain'},$ENV{'user.name'},
+                            $ENV{'user.host'},
+                            'Locked by priv: '.$priv.' for '.$uri.' due to '.
+                            $cdom.'/'.$cnum.'/'.$csec.' expire '.
+                            $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
+		       return '';
+                   }
+               }
+	   }
        }
+    }
+   
+#
+# Rest of the restrictions depend on selected course
+#
 
-       if ($uricond>=0) {
+    unless ($ENV{'request.course.id'}) {
+       return '1';
+    }
 
-# The resource is part of the course
-# If user had full access on course level, go ahead
+#
+# Now user is definitely in a course
+#
 
-           if ($thisallowed=~/F/) {
-	       return 'F';
-           }
 
-# Restricted by state?
+# Course preferences
 
-           if ($thisallowed=~/X/) {
-	      if (&condval($uricond)) {
-	         return '2';
-              } else {
-                 return '';
-              }
+   if ($thisallowed=~/C/) {
+       my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
+       if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
+	   =~/\,$rolecode\,/) {
+           &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
+                'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
+                $ENV{'request.course.id'});
+           return '';
+       }
+   }
+
+# Resource preferences
+
+   if ($thisallowed=~/R/) {
+       my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
+       my $filename=$perlvar{'lonDocRoot'}.'/res/'.$uri.'.meta';
+       if (-e $filename) {
+           my @content;
+           {
+	     my $fh=Apache::File->new($filename);
+             @content=<$fh>;
 	   }
+           if (join('',@content)=~
+                    /\<roledeny[^\>]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {
+	       &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
+                    'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
+           return '';
+
+           }
        }
-    }
-    return $thisallowed;
-}
+   }
 
-# ---------------------------------------------------------- Refresh State Info
+# Restricted by state?
+
+   if ($thisallowed=~/X/) {
+      if (&condval($statecond)) {
+	 return '2';
+      } else {
+         return '';
+      }
+   }
 
-sub refreshstate {
+   return 'F';
 }
 
 # ----------------------------------------------------------------- Define Role
@@ -819,6 +1656,27 @@ sub definerole {
   }
 }
 
+# ---------------- Make a metadata query against the network of library servers
+
+sub metadata_query {
+    my ($query,$custom,$customshow)=@_;
+    # need to put in a library server loop here and return a hash
+    my %rhash;
+    for my $server (keys %libserv) {
+	unless ($custom or $customshow) {
+	    my $reply=&reply("querysend:".&escape($query),$server);
+	    $rhash{$server}=$reply;
+	}
+	else {
+	    my $reply=&reply("querysend:".&escape($query).':'.
+			     &escape($custom).':'.&escape($customshow),
+			     $server);
+	    $rhash{$server}=$reply;
+	}
+    }
+    return \%rhash;
+}
+
 # ------------------------------------------------------------------ Plain Text
 
 sub plaintext {
@@ -835,7 +1693,7 @@ sub fileembstyle {
 
 # ------------------------------------------------------------ Description Text
 
-sub filedecription {
+sub filedescription {
     my $ending=shift;
     return $fd{$ending};
 }
@@ -845,29 +1703,215 @@ sub filedecription {
 sub assignrole {
     my ($udom,$uname,$url,$role,$end,$start)=@_;
     my $mrole;
-    $url=declutter($url);
     if ($role =~ /^cr\//) {
-        unless ($url=~/\.course$/) { return 'invalid'; }
-	unless (allowed('ccr',$url)) { return 'refused'; }
+	unless (&allowed('ccr',$url)) {
+           &logthis('Refused custom assignrole: '.
+             $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
+		    $ENV{'user.name'}.' at '.$ENV{'user.domain'});
+           return 'refused'; 
+        }
         $mrole='cr';
     } else {
-        unless (($url=~/\.course$/) || ($url=~/\/$/)) { return 'invalid'; }
-        unless (allowed('c'+$role)) { return 'refused'; }
+        my $cwosec=$url;
+        $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
+        unless (&allowed('c'.$role,$cwosec)) { 
+           &logthis('Refused assignrole: '.
+             $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
+		    $ENV{'user.name'}.' at '.$ENV{'user.domain'});
+           return 'refused'; 
+        }
         $mrole=$role;
     }
     my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
                 "$udom:$uname:$url".'_'."$mrole=$role";
-    if ($end) { $command.='_$end'; }
+    if ($end) { $command.='_'.$end; }
     if ($start) {
 	if ($end) { 
-           $command.='_$start'; 
+           $command.='_'.$start; 
         } else {
-           $command.='_0_$start';
+           $command.='_0_'.$start;
         }
     }
     return &reply($command,&homeserver($uname,$udom));
 }
 
+# -------------------------------------------------- Modify user authentication
+sub modifyuserauth {
+    my ($udom,$uname,$umode,$upass)=@_;
+    my $uhome=&homeserver($uname,$udom);
+    &logthis('Call to modify user authentication'.$udom.', '.$uname.', '.
+             $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});  
+    my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
+		     &escape($upass),$uhome);
+    unless ($reply eq 'ok') {
+	return 'error: '.$reply;
+    }   
+    return 'ok';
+}
+
+# --------------------------------------------------------------- Modify a user
+
+
+sub modifyuser {
+    my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene)=@_;
+    &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
+             $umode.', '.$first.', '.$middle.', '.
+	     $last.', '.$gene.' by '.
+             $ENV{'user.name'}.' at '.$ENV{'user.domain'});  
+    my $uhome=&homeserver($uname,$udom);
+# ----------------------------------------------------------------- Create User
+    if (($uhome eq 'no_host') && ($umode) && ($upass)) {
+        my $unhome='';
+	if ($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
+	    $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+        } else {
+            my $tryserver;
+            my $loadm=10000000;
+            foreach $tryserver (keys %libserv) {
+	       if ($hostdom{$tryserver} eq $udom) {
+                  my $answer=reply('load',$tryserver);
+                  if (($answer=~/\d+/) && ($answer<$loadm)) {
+		      $loadm=$answer;
+                      $unhome=$tryserver;
+                  }
+	       }
+	    }
+        }
+        if (($unhome eq '') || ($unhome eq 'no_host')) {
+	    return 'error: find home';
+        }
+        my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
+                         &escape($upass),$unhome);
+	unless ($reply eq 'ok') {
+            return 'error: '.$reply;
+        }   
+        $uhome=&homeserver($uname,$udom);
+        if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
+	    return 'error: verify home';
+        }
+    }
+# ---------------------------------------------------------------------- Add ID
+    if ($uid) {
+       $uid=~tr/A-Z/a-z/;
+       my %uidhash=&idrget($udom,$uname);
+       if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)) {
+	  unless ($uid eq $uidhash{$uname}) {
+	      return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;
+          }
+       } else {
+	  &idput($udom,($uname => $uid));
+       }
+    }
+# -------------------------------------------------------------- Add names, etc
+    my %names=&get('environment',
+		   ['firstname','middlename','lastname','generation'],
+		   $udom,$uname);
+    if ($first)  { $names{'firstname'}  = $first; }
+    if ($middle) { $names{'middlename'} = $middle; }
+    if ($last)   { $names{'lastname'}   = $last; }
+    if ($gene)   { $names{'generation'} = $gene; }
+    my $reply = &put('environment', \%names, $udom,$uname);
+    if ($reply ne 'ok') { return 'error: '.$reply; }
+    &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
+             $umode.', '.$first.', '.$middle.', '.
+	     $last.', '.$gene.' by '.
+             $ENV{'user.name'}.' at '.$ENV{'user.domain'});
+    return 'ok';
+}
+
+# -------------------------------------------------------------- Modify student
+
+sub modifystudent {
+    my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
+        $end,$start)=@_;
+    my $cid='';
+    unless ($cid=$ENV{'request.course.id'}) {
+	return 'not_in_class';
+    }
+# --------------------------------------------------------------- Make the user
+    my $reply=&modifyuser
+	($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene);
+    unless ($reply eq 'ok') { return $reply; }
+    my $uhome=&homeserver($uname,$udom);
+    if (($uhome eq '') || ($uhome eq 'no_host')) { 
+	return 'error: no such user';
+    }
+# -------------------------------------------------- Add student to course list
+    $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
+	              $ENV{'course.'.$cid.'.num'}.':classlist:'.
+                      &escape($uname.':'.$udom).'='.
+                      &escape($end.':'.$start),
+	              $ENV{'course.'.$cid.'.home'});
+    unless (($reply eq 'ok') || ($reply eq 'delayed')) {
+	return 'error: '.$reply;
+    }
+# ---------------------------------------------------- Add student role to user
+    my $uurl='/'.$cid;
+    $uurl=~s/\_/\//g;
+    if ($usec) {
+	$uurl.='/'.$usec;
+    }
+    return &assignrole($udom,$uname,$uurl,'st',$end,$start);
+}
+
+# ------------------------------------------------- Write to course preferences
+
+sub writecoursepref {
+    my ($courseid,%prefs)=@_;
+    $courseid=~s/^\///;
+    $courseid=~s/\_/\//g;
+    my ($cdomain,$cnum)=split(/\//,$courseid);
+    my $chome=homeserver($cnum,$cdomain);
+    if (($chome eq '') || ($chome eq 'no_host')) { 
+	return 'error: no such course';
+    }
+    my $cstring='';
+    map {
+	$cstring.=escape($_).'='.escape($prefs{$_}).'&';
+    } keys %prefs;
+    $cstring=~s/\&$//;
+    return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
+}
+
+# ---------------------------------------------------------- Make/modify course
+
+sub createcourse {
+    my ($udom,$description,$url)=@_;
+    $url=&declutter($url);
+    my $cid='';
+    unless (&allowed('ccc',$ENV{'user.domain'})) {
+        return 'refused';
+    }
+    unless ($udom eq $ENV{'user.domain'}) {
+        return 'refused';
+    }
+# ------------------------------------------------------------------- Create ID
+   my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+       unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+# ----------------------------------------------- Make sure that does not exist
+   my $uhome=&homeserver($uname,$udom);
+   unless (($uhome eq '') || ($uhome eq 'no_host')) {
+       $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+        unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+       $uhome=&homeserver($uname,$udom);       
+       unless (($uhome eq '') || ($uhome eq 'no_host')) {
+           return 'error: unable to generate unique course-ID';
+       } 
+   }
+# ------------------------------------------------------------- Make the course
+    my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
+                      $ENV{'user.home'});
+    unless ($reply eq 'ok') { return 'error: '.$reply; }
+    $uhome=&homeserver($uname,$udom);
+    if (($uhome eq '') || ($uhome eq 'no_host')) { 
+	return 'error: no such course';
+    }
+    &writecoursepref($udom.'_'.$uname,
+                     ('description' => $description,
+                      'url'         => $url));
+    return '/'.$udom.'/'.$uname;
+}
+
 # ---------------------------------------------------------- Assign Custom Role
 
 sub assigncustomrole {
@@ -956,8 +2000,16 @@ sub directcondval {
 sub condval {
     my $condidx=shift;
     my $result=0;
+    my $allpathcond='';
+    map {
+       if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
+	   $allpathcond.=
+               '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
+       }
+    } split(/\|/,$condidx);
+    $allpathcond=~s/\|$//;
     if ($ENV{'request.course.id'}) {
-       if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$condidx})) {
+       if ($allpathcond) {
           my $operand='|';
 	  my @stack;
           map {
@@ -980,8 +2032,7 @@ sub condval {
                      $result=$result>$new?$result:$new;
                   }                  
               }
-          } ($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$condidx}=~
-             /(\d+|\(|\)|\&|\|)/g);
+          } ($allpathcond=~/(\d+|\(|\)|\&|\|)/g);
        }
     }
     return $result;
@@ -989,21 +2040,270 @@ sub condval {
 
 # --------------------------------------------------------- Value of a Variable
 
-sub varval {
-    my ($realm,$space,@components)=split(/\./,shift);
-    my $value='';
+sub EXT {
+    my ($varname,$symbparm)=@_;
+    unless ($varname) { return ''; }
+    my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
+    my $rest;
+    if ($therest[0]) {
+       $rest=join('.',@therest);
+    } else {
+       $rest='';
+    }
+    my $qualifierrest=$qualifier;
+    if ($rest) { $qualifierrest.='.'.$rest; }
+    my $spacequalifierrest=$space;
+    if ($qualifierrest) { $spacequalifierrest.='.'.$qualifierrest; }
     if ($realm eq 'user') {
-	if ($space=~/^resource/) {
-	    $space=~s/^resource\[//;
-            $space=~s/\]$//;
-
+# --------------------------------------------------------------- user.resource
+	if ($space eq 'resource') {
+	    my %restored=&restore();
+            return $restored{$qualifierrest};
+# ----------------------------------------------------------------- user.access
+        } elsif ($space eq 'access') {
+            return &allowed($qualifier,$rest);
+# ------------------------------------------ user.preferences, user.environment
+        } elsif (($space eq 'preferences') || ($space eq 'environment')) {
+            return $ENV{join('.',('environment',$qualifierrest))};
+# ----------------------------------------------------------------- user.course
+        } elsif ($space eq 'course') {
+            return $ENV{join('.',('request.course',$qualifier))};
+# ------------------------------------------------------------------- user.role
+        } elsif ($space eq 'role') {
+            my ($role,$where)=split(/\./,$ENV{'request.role'});
+            if ($qualifier eq 'value') {
+		return $role;
+            } elsif ($qualifier eq 'extent') {
+                return $where;
+            }
+# ----------------------------------------------------------------- user.domain
+        } elsif ($space eq 'domain') {
+            return $ENV{'user.domain'};
+# ------------------------------------------------------------------- user.name
+        } elsif ($space eq 'name') {
+            return $ENV{'user.name'};
+# ---------------------------------------------------- Any other user namespace
+        } else {
+            my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
+            my %reply=&get($space,[$item]);
+            return $reply{$item};
+        }
+    } elsif ($realm eq 'request') {
+# ------------------------------------------------------------- request.browser
+        if ($space eq 'browser') {
+	    return $ENV{'browser.'.$qualifier};
+# ------------------------------------------------------------ request.filename
         } else {
+            return $ENV{'request.'.$spacequalifierrest};
         }
     } elsif ($realm eq 'course') {
-    } elsif ($realm eq 'session') {
+# ---------------------------------------------------------- course.description
+        return $ENV{'course.'.$ENV{'request.course.id'}.'.'.
+                              $spacequalifierrest};
+    } elsif ($realm eq 'resource') {
+       if ($ENV{'request.course.id'}) {
+
+#	   print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
+
+
+# ----------------------------------------------------- Cascading lookup scheme
+         my $symbp;
+         if ($symbparm) {
+            $symbp=$symbparm;
+	 } else {
+            $symbp=&symbread();
+         }            
+         my $mapp=(split(/\_\_\_/,$symbp))[0];
+
+         my $symbparm=$symbp.'.'.$spacequalifierrest;
+         my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
+
+         my $seclevel=
+            $ENV{'request.course.id'}.'.['.
+		$ENV{'request.course.sec'}.'].'.$spacequalifierrest;
+         my $seclevelr=
+            $ENV{'request.course.id'}.'.['.
+		$ENV{'request.course.sec'}.'].'.$symbparm;
+         my $seclevelm=
+            $ENV{'request.course.id'}.'.['.
+		$ENV{'request.course.sec'}.'].'.$mapparm;
+
+         my $courselevel=
+            $ENV{'request.course.id'}.'.'.$spacequalifierrest;
+         my $courselevelr=
+            $ENV{'request.course.id'}.'.'.$symbparm;
+         my $courselevelm=
+            $ENV{'request.course.id'}.'.'.$mapparm;
+
+# ----------------------------------------------------------- first, check user
+         my %resourcedata=get('resourcedata',
+                           [$courselevelr,$courselevelm,$courselevel]);
+         if (($resourcedata{$courselevelr}!~/^error\:/) &&
+             ($resourcedata{$courselevelr}!~/^con_lost/)) {
+
+         if ($resourcedata{$courselevelr}) { 
+            return $resourcedata{$courselevelr}; }
+         if ($resourcedata{$courselevelm}) { 
+            return $resourcedata{$courselevelm}; }
+         if ($resourcedata{$courselevel}) { return $resourcedata{$courselevel}; }
+
+      } else {
+	  if ($resourcedata{$courselevelr}!~/No such file/) {
+	    &logthis("<font color=blue>WARNING:".
+		   " Trying to get resource data for ".$ENV{'user.name'}." at "
+                   .$ENV{'user.domain'}.": ".$resourcedata{$courselevelr}.
+                 "</font>");
+	  }
+      }
+
+# -------------------------------------------------------- second, check course
+
+        my $reply=&reply('get:'.
+              $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
+              $ENV{'course.'.$ENV{'request.course.id'}.'.num'}.
+	      ':resourcedata:'.
+   &escape($seclevelr).'&'.&escape($seclevelm).'&'.&escape($seclevel).'&'.
+   &escape($courselevelr).'&'.&escape($courselevelm).'&'.&escape($courselevel),
+		   $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
+      if ($reply!~/^error\:/) {
+	  map {
+	      if ($_) { return &unescape($_); }
+          } split(/\&/,$reply);
+      }
+      if (($reply=~/^con_lost/) || ($reply=~/^error\:/)) {
+	  &logthis("<font color=blue>WARNING:".
+                " Getting ".$reply." asking for ".$varname." for ".
+                $ENV{'course.'.$ENV{'request.course.id'}.'.num'}.
+                ' at '.
+                $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.
+                ' from '.
+                $ENV{'course.'.$ENV{'request.course.id'}.'.home'}.
+                 "</font>");
+      }
+# ------------------------------------------------------ third, check map parms
+       my %parmhash=();
+       my $thisparm='';       
+       if (tie(%parmhash,'GDBM_File',
+          $ENV{'request.course.fn'}.'_parms.db',&GDBM_READER,0640)) {
+           $thisparm=$parmhash{$symbparm};
+	   untie(%parmhash);
+       }
+       if ($thisparm) { return $thisparm; }
+     }
+     
+# --------------------------------------------- last, look in resource metadata
+
+      $spacequalifierrest=~s/\./\_/;
+      my $metadata=&metadata($ENV{'request.filename'},$spacequalifierrest);
+      if ($metadata) { return $metadata; }
+      $metadata=&metadata($ENV{'request.filename'},
+                                         'parameter_'.$spacequalifierrest);
+      if ($metadata) { return $metadata; }
+
+# ------------------------------------------------------------------ Cascade up
+
+      unless ($space eq '0') {
+          my ($part,$id)=split(/\_/,$space);
+          if ($id) {
+	      my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
+                                   $symbparm);
+              if ($partgeneral) { return $partgeneral; }
+          } else {
+              my $resourcegeneral=&EXT('resource.0.'.$qualifierrest,
+                                       $symbparm);
+              if ($resourcegeneral) { return $resourcegeneral; }
+          }
+      }
+
+# ---------------------------------------------------- Any other user namespace
+    } elsif ($realm eq 'environment') {
+# ----------------------------------------------------------------- environment
+        return $ENV{'environment.'.$spacequalifierrest};
     } elsif ($realm eq 'system') {
+# ----------------------------------------------------------------- system.time
+	if ($space eq 'time') {
+	    return time;
+        }
+    }
+    return '';
+}
+
+# ---------------------------------------------------------------- Get metadata
+
+sub metadata {
+    my ($uri,$what)=@_;
+
+    $uri=&declutter($uri);
+    my $filename=$uri;
+    $uri=~s/\.meta$//;
+    unless ($metacache{$uri.':keys'}) {
+        my %metathesekeys=();
+        unless ($filename=~/\.meta$/) { $filename.='.meta'; }
+	my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
+        my $parser=HTML::TokeParser->new(\$metastring);
+        my $token;
+        undef %metathesekeys;
+        while ($token=$parser->get_token) {
+           if ($token->[0] eq 'S') {
+	     if (defined($token->[2]->{'package'})) {
+	      my $package=$token->[2]->{'package'};
+	      my $keyroot='';
+              if (defined($token->[2]->{'part'})) { 
+                 $keyroot.='_'.$token->[2]->{'part'}; 
+	      }
+              if (defined($token->[2]->{'id'})) { 
+                 $keyroot.='_'.$token->[2]->{'id'}; 
+	      }
+              if ($metacache{$uri.':packages'}) {
+                 $metacache{$uri.':packages'}.=','.$package.$keyroot;
+              } else {
+                 $metacache{$uri.':packages'}=$package.$keyroot;
+	      }
+              map {
+		  if ($_=~/^$package\&/) {
+		      my ($pack,$name,$subp)=split(/\&/,$_);
+                      my $value=$packagetab{$_};
+		      my $part=$keyroot;
+                      $part=~s/^\_//;
+                      if ($subp eq 'display') {
+			  $value.=' [Part: '.$part.']';
+                      }
+                      my $unikey='parameter'.$keyroot.'_'.$name;
+                      $metathesekeys{$unikey}=1;
+                      $metacache{$uri.':'.$unikey.'.part'}=$part;
+                      unless 
+                       (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
+                         $metacache{$uri.':'.$unikey.'.'.$subp}=$value;
+		      }
+                  }
+              } keys %packagetab;
+             } else {
+	      my $entry=$token->[1];
+              my $unikey=$entry;
+              if (defined($token->[2]->{'part'})) { 
+                 $unikey.='_'.$token->[2]->{'part'}; 
+	      }
+              if (defined($token->[2]->{'id'})) { 
+                 $unikey.='_'.$token->[2]->{'id'}; 
+	      }
+              if (defined($token->[2]->{'name'})) { 
+                 $unikey.='_'.$token->[2]->{'name'}; 
+	      }
+              $metathesekeys{$unikey}=1;
+              map {
+		  $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
+              } @{$token->[3]};
+              unless (
+                 $metacache{$uri.':'.$unikey}=$parser->get_text('/'.$entry)
+		      ) { $metacache{$uri.':'.$unikey}=
+			      $metacache{$uri.':'.$unikey.'.default'};
+		      }
+	    }
+	 }
+       }
+       $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
     }
-    return $value;
+    return $metacache{$uri.':'.$what};
 }
 
 # ------------------------------------------------- Update symbolic store links
@@ -1029,11 +2329,15 @@ sub symblist {
 # ------------------------------------------------------ Return symb list entry
 
 sub symbread {
-    my $thisfn=declutter(shift);
+    my $thisfn=shift;
+    unless ($thisfn) {
+	$thisfn=$ENV{'request.filename'};
+    }
+    $thisfn=declutter($thisfn);
     my %hash;
     my %bighash;
     my $syval='';
-    if (($ENV{'request.course.fn'}) && ($ENV{'request.filename'})) {
+    if (($ENV{'request.course.fn'}) && ($thisfn)) {
         if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
                       &GDBM_READER,0640)) {
 	    $syval=$hash{$thisfn};
@@ -1043,6 +2347,7 @@ sub symbread {
         if ($syval) {
            unless ($syval=~/\_\d+$/) {
 	       unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
+                  &appenv('request.ambiguous' => $thisfn);
                   return '';
                }    
                $syval.=$1;
@@ -1053,6 +2358,9 @@ sub symbread {
                             &GDBM_READER,0640)) {
 # ---------------------------------------------- Get ID(s) for current resource
               my $ids=$bighash{'ids_/res/'.$thisfn};
+              unless ($ids) { 
+                 $ids=$bighash{'ids_/'.$thisfn};
+              }
               if ($ids) {
 # ------------------------------------------------------------------- Has ID(s)
                  my @possibilities=split(/\,/,$ids);
@@ -1080,8 +2388,11 @@ sub symbread {
               untie(%bighash)
            } 
         }
-        if ($syval) { return $syval.'___'.$thisfn; }
+        if ($syval) {
+           return $syval.'___'.$thisfn; 
+        }
     }
+    &appenv('request.ambiguous' => $thisfn);
     return '';
 }
 
@@ -1100,20 +2411,50 @@ sub numval {
 }    
 
 sub rndseed {
-    my $symb;
-    unless ($symb=&symbread($ENV{'request.filename'})) { return time; }
-    my $symbchck=unpack("%32C*",$symb);
-    my $symbseed=numval($symb)%$symbchck;
-    my $namechck=unpack("%32C*",$ENV{'user.name'});
-    my $nameseed=numval($ENV{'user.name'})%$namechck;
-    return int( $symbseed
-	       .$nameseed
-               .unpack("%32C*",$ENV{'user.domain'})
-               .unpack("%32C*",$ENV{'request.course.id'})
-               .$namechck
-               .$symbchck);
+    my ($symb,$courseid,$domain,$username)=@_;
+    if (!$symb) {
+      unless ($symb=&symbread()) { return time; }
+    }
+    if (!$courseid) { $courseid=$ENV{'request.course.id'};}
+    if (!$domain) {$domain=$ENV{'user.domain'};}
+    if (!$username) {$username=$ENV{'user.name'};}
+    {
+      use integer;
+      my $symbchck=unpack("%32C*",$symb) << 27;
+      my $symbseed=numval($symb) << 22;
+      my $namechck=unpack("%32C*",$username) << 17;
+      my $nameseed=numval($username) << 12;
+      my $domainseed=unpack("%32C*",$domain) << 7;
+      my $courseseed=unpack("%32C*",$courseid);
+      my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
+      #uncommenting these lines can break things!
+      #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+      #&Apache::lonxml::debug("rndseed :$num:$symb");
+      return $num;
+    }
 }
 
+sub ireceipt {
+    my ($funame,$fudom,$fucourseid,$fusymb)=@_;
+    my $cuname=unpack("%32C*",$funame);
+    my $cudom=unpack("%32C*",$fudom);
+    my $cucourseid=unpack("%32C*",$fucourseid);
+    my $cusymb=unpack("%32C*",$fusymb);
+    my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});
+    return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
+           ($cunique%$cuname+
+            $cunique%$cudom+
+            $cusymb%$cuname+
+            $cusymb%$cudom+
+            $cucourseid%$cuname+
+            $cucourseid%$cudom);
+}
+
+sub receipt {
+    return &ireceipt($ENV{'user.name'},$ENV{'user.domain'},
+                     $ENV{'request.course.id'},&symbread());
+}
+  
 # ------------------------------------------------------------ Serves up a file
 # returns either the contents of the file or a -1
 sub getfile {
@@ -1130,19 +2471,34 @@ sub filelocation {
   my ($dir,$file) = @_;
   my $location;
   $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
-  $file=~s/^$perlvar{'lonDocRoot'}//;
-  $file=~s:^/*res::;
-  if ( !( $file =~ m:^/:) ) {
-    $location = $dir. '/'.$file;
+  if ($file=~m:^/~:) { # is a contruction space reference
+    $location = $file;
+    $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
   } else {
-    $location = '/home/httpd/html/res'.$file;
+    $file=~s/^$perlvar{'lonDocRoot'}//;
+    $file=~s:^/*res::;
+    if ( !( $file =~ m:^/:) ) {
+      $location = $dir. '/'.$file;
+    } else {
+      $location = '/home/httpd/html/res'.$file;
+    }
   }
   $location=~s://+:/:g; # remove duplicate /
-  while ($location=~m:/../:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
-
+  while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
   return $location;
 }
 
+sub hreflocation {
+    my ($dir,$file)=@_;
+    unless (($_=~/^http:\/\//i) || ($_=~/^\//)) {
+       my $finalpath=filelocation($dir,$file);
+       $finalpath=~s/^\/home\/httpd\/html//;
+       return $finalpath;
+    } else {
+       return $file;
+    }
+}
+
 # ------------------------------------------------------------- Declutters URLs
 
 sub declutter {
@@ -1172,7 +2528,7 @@ sub unescape {
 # ================================================================ Main Program
 
 sub BEGIN {
-if ($readit ne 'done') {
+unless ($readit) {
 # ------------------------------------------------------------ Read access.conf
 {
     my $config=Apache::File->new("/etc/httpd/conf/access.conf");
@@ -1191,9 +2547,11 @@ if ($readit ne 'done') {
     my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
 
     while (my $configline=<$config>) {
+       chomp($configline);
        my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
        $hostname{$id}=$name;
        $hostdom{$id}=$domain;
+       $hostip{$id}=$ip;
        if ($role eq 'library') { $libserv{$id}=$name; }
     }
 }
@@ -1215,8 +2573,10 @@ if ($readit ne 'done') {
 
     while (my $configline=<$config>) {
        chomp($configline);
+      if ($configline) {
        my ($role,$perm)=split(/ /,$configline);
        if ($perm ne '') { $pr{$role}=$perm; }
+      }
     }
 }
 
@@ -1226,8 +2586,25 @@ if ($readit ne 'done') {
 
     while (my $configline=<$config>) {
        chomp($configline);
+      if ($configline) {
        my ($short,$plain)=split(/:/,$configline);
        if ($plain ne '') { $prp{$short}=$plain; }
+      }
+    }
+}
+
+# ---------------------------------------------------------- Read package table
+{
+    my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
+
+    while (my $configline=<$config>) {
+       chomp($configline);
+       my ($short,$plain)=split(/:/,$configline);
+       my ($pack,$name)=split(/\&/,$short);
+       if ($plain ne '') {
+          $packagetab{$pack.'&'.$name.'&name'}=$name; 
+          $packagetab{$short}=$plain; 
+       }
     }
 }
 
@@ -1245,8 +2622,10 @@ if ($readit ne 'done') {
     }
 }
 
+%metacache=();
 
 $readit='done';
+&logtouch();
 &logthis('<font color=yellow>INFO: Read configuration</font>');
 }
 }