--- loncom/lonnet/perl/lonnet.pm	2000/10/10 18:46:53	1.42
+++ loncom/lonnet/perl/lonnet.pm	2002/09/17 21:19:19	1.285
@@ -1,53 +1,29 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# Functions for use by content handlers:
+# $Id: lonnet.pm,v 1.285 2002/09/17 21:19:19 matthew Exp $
 #
-# plaintext(short)   : plain text explanation of short term
-# fileembstyle(ext)  : embed style in page for file extension
-# filedescription(ext) : descriptor text for file extension
-# allowed(short,url) : returns codes for allowed actions 
-#                      F: full access
-#                      U,I,K: authentication modes (cxx only)
-#                      '': forbidden
-#                      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
-#                      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
-#                      (leave empty string or zero for "no date") 
-# assigncustomrole (udom,uname,url,rdom,rnam,rolename,end,start) : give a
-#                      custom role to a user for the level given by url.
-#                      Specify name and domain of role author, and role name
-# 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
-# ssi(url,hash)      : does a complete request cycle on url to localhost, posts
-#                      hash
-# coursedescription(id) : returns and caches course description for id
-# repcopy(filename)  : replicate file
-# dirlist(url)       : gets a directory listing
-# 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
-# symblist(map,hash) : Updates symbolic storage links
-# symbread(filename) : returns the data handle
-# rndseed()          : returns a random seed  
-# 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 
-#                          from the directory dir
+# 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/
 #
 # 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,
@@ -62,7 +38,37 @@
 # 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 Gerd Kortemeyer
+# 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
+# 11/17,11/20,11/22,11/29 Gerd Kortemeyer
+# 12/5 Matthew Hall
+# 12/5 Guy Albertelli
+# 12/6,12/7,12/12 Gerd Kortemeyer
+# 12/18 Scott Harrison
+# 12/21,12/22,12/27,12/28 Gerd Kortemeyer
+# YEAR=2002
+# 1/4,2/4,2/7 Gerd Kortemeyer
+#
+###
 
 package Apache::lonnet;
 
@@ -71,13 +77,29 @@ 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 %badServerCache %hostip %spareid %hostdom 
+   %libserv %pr %prp %metacache %packagetab 
+   %courselogs %accesshash $processmarker $dumpcount 
+   %coursedombuf %coursehombuf %courseresdatacache %domaindescription);
 use IO::Socket;
 use GDBM_File;
 use Apache::Constants qw(:common :http);
+use HTML::LCParser;
+use Fcntl qw(:flock);
+my $readit;
 
 # --------------------------------------------------------------------- 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'};
@@ -115,10 +137,25 @@ sub subreply {
 
 sub reply {
     my ($cmd,$server)=@_;
+    unless (defined($hostname{$server})) { return 'no_such_host'; }
     my $answer=subreply($cmd,$server);
-    if ($answer eq 'con_lost') { $answer=subreply($cmd,$server); }
-    if (($answer=~/^error:/) || ($answer=~/^refused/) || 
-        ($answer=~/^rejected/)) {
+    if ($answer eq 'con_lost') {
+       #sleep 5; 
+       #$answer=subreply($cmd,$server);
+       #if ($answer eq 'con_lost') {
+	#   &logthis("Second attempt con_lost on $server");
+        #   my $peerfile="$perlvar{'lonSockDir'}/$server";
+        #   my $client=IO::Socket::UNIX->new(Peer    =>"$peerfile",
+        #                                    Type    => SOCK_STREAM,
+        #                                    Timeout => 10)
+        #              or return "con_lost";
+        #   &logthis("Killing socket");
+        #   print $client "close_connection_exit\n";
+           #sleep 5;
+        #   $answer=subreply($cmd,$server);       
+       #}   
+    }
+    if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
        &logthis("<font color=blue>WARNING:".
                 " $cmd to $server returned $answer</font>");
     }
@@ -158,6 +195,11 @@ 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);
@@ -207,22 +249,36 @@ sub critical {
 
 sub appenv {
     my %newenv=@_;
-    map {
+    foreach (keys %newenv) {
 	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]);
@@ -242,16 +298,86 @@ 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: '.$!);
+         $fh->close();
+         return 'error: '.$!;
+     }
+     foreach (@oldenv) {
+	 unless ($_=~/^$delthis/) { print $fh $_; }
+     }
+     $fh->close();
+    }
+    return 'ok';
+}
+
+# ------------------------------------------ Fight off request when overloaded
+
+sub overloaderror {
+    my ($r,$checkserver)=@_;
+    unless ($checkserver) { $checkserver=$perlvar{'lonHostID'}; }
+    my $loadavg;
+    if ($checkserver eq $perlvar{'lonHostID'}) {
+       my $loadfile=Apache::File->new('/proc/loadavg');
+       $loadavg=<$loadfile>;
+       $loadavg =~ s/\s.*//g;
+       $loadavg = 100*$loadavg/$perlvar{'lonLoadLim'};
+    } else {
+       $loadavg=&reply('load',$checkserver);
+    }
+    my $overload=$loadavg-100;
+    if ($overload>0) {
+	$r->err_headers_out->{'Retry-After'}=$overload;
+        $r->log_error('Overload of '.$overload.' on '.$checkserver);
+        return 413;
+    }    
+    return '';
+}
 
 # ------------------------------ Find server with least workload from spare.tab
 
 sub spareserver {
+    my $loadpercent = shift;
     my $tryserver;
     my $spareserver='';
-    my $lowestserver=100;
+    my $lowestserver=$loadpercent; 
     foreach $tryserver (keys %spareid) {
        my $answer=reply('load',$tryserver);
        if (($answer =~ /\d/) && ($answer<$lowestserver)) {
@@ -262,11 +388,85 @@ sub spareserver {
     return $spareserver;
 }
 
+# --------------------------------------------- Try to change a user's password
+
+sub changepass {
+    my ($uname,$udom,$currentpass,$newpass,$server)=@_;
+    $currentpass = &escape($currentpass);
+    $newpass     = &escape($newpass);
+    my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass",
+		       $server);
+    if (! $answer) {
+	&logthis("No reply on password change request to $server ".
+		 "by $uname in domain $udom.");
+    } elsif ($answer =~ "^ok") {
+        &logthis("$uname in $udom successfully changed their password ".
+		 "on $server.");
+    } elsif ($answer =~ "^pwchange_failure") {
+	&logthis("$uname in $udom was unable to change their password ".
+		 "on $server.  The action was blocked by either lcpasswd ".
+		 "or pwchange");
+    } elsif ($answer =~ "^non_authorized") {
+        &logthis("$uname in $udom did not get their password correct when ".
+		 "attempting to change it on $server.");
+    } elsif ($answer =~ "^auth_mode_error") {
+        &logthis("$uname in $udom attempted to change their password despite ".
+		 "not being locally or internally authenticated on $server.");
+    } elsif ($answer =~ "^unknown_user") {
+        &logthis("$uname in $udom attempted to change their password ".
+		 "on $server but were unable to because $server is not ".
+		 "their home server.");
+    } elsif ($answer =~ "^refused") {
+	&logthis("$server refused to change $uname in $udom password because ".
+		 "it was sent an unencrypted request to change the password.");
+    }
+    return $answer;
+}
+
+# ----------------------- Try to determine user's current authentication scheme
+
+sub queryauthenticate {
+    my ($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 {
     my ($uname,$upass,$udom)=@_;
     $upass=escape($upass);
+    $uname=~s/\W//g;
     if (($perlvar{'lonRole'} eq 'library') && 
         ($udom eq $perlvar{'lonDefDomain'})) {
     my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
@@ -305,24 +505,145 @@ sub authenticate {
 # ---------------------- Find the homebase for a user from domain's lib servers
 
 sub homeserver {
-    my ($uname,$udom)=@_;
-
+    my ($uname,$udom,$ignoreBadCache)=@_;
     my $index="$uname:$udom";
-    if ($homecache{$index}) { return "$homecache{$index}"; }
-
+    if ($homecache{$index}) { 
+        return "$homecache{$index}"; 
+    }
     my $tryserver;
     foreach $tryserver (keys %libserv) {
+        next if ($ignoreBadCache ne 'true' && 
+		 exists($badServerCache{$tryserver}));
 	if ($hostdom{$tryserver} eq $udom) {
            my $answer=reply("home:$udom:$uname",$tryserver);
            if ($answer eq 'found') { 
-	      $homecache{$index}=$tryserver;
+              $homecache{$index}=$tryserver;
               return $tryserver; 
-	   }
+           } elsif ($answer eq 'no_host') {
+	       $badServerCache{$tryserver}=1;
+           }
        }
     }    
     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=();
+    foreach (@unames) {
+        $returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
+    }
+    return %returnhash;
+}
+
+# ------------------------------- Store away a list of names and associated IDs
+
+sub idput {
+    my ($udom,%ids)=@_;
+    my %servers=();
+    foreach (keys %ids) {
+        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);
+        }
+    }
+    foreach (keys %servers) {
+        &critical('idput:'.$udom.':'.$servers{$_},$_);
+    }
+}
+
+# ------------------------------------- Find the section of student in a course
+
+sub usection {
+    my ($udom,$unam,$courseid)=@_;
+    $courseid=~s/\_/\//g;
+    $courseid=~s/^(\w)/\/$1/;
+    foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
+                        &homeserver($unam,$udom)))) {
+        my ($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 $section; }
+        }
+    }
+    return '-1';
+}
+
+# ------------------------------------- Read an entry from a user's environment
+
+sub userenvironment {
+    my ($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[$i]);
+    }
+    return %returnhash;
+}
+
+# -------------------------------------------------------------------- New chat
+
+sub chatsend {
+    my ($newentry,$anon)=@_;
+    my $cnum=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
+    my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
+    my $chome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+    &reply('chatsend:'.$cdom.':'.$cnum.':'.
+	   &escape($ENV{'user.domain'}.':'.$ENV{'user.name'}.':'.$anon.':'.
+		   &escape($newentry)),$chome);
+}
+
 # ----------------------------- Subscribe to a resource, return URL if possible
 
 sub subscribe {
@@ -335,6 +656,9 @@ sub subscribe {
         return 'not_found'; 
     }
     my $answer=reply("sub:$fname",$home);
+    if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
+	$answer.=' by '.$home;
+    }
     return $answer;
 }
     
@@ -343,17 +667,18 @@ sub subscribe {
 sub repcopy {
     my $filename=shift;
     $filename=~s/\/+/\//g;
+    if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
     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;
@@ -408,7 +733,7 @@ sub ssi {
     
     if (%form) {
       $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
-      $request->content(join '&', map { "$_=$form{$_}" } keys %form);
+      $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
     } else {
       $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
     }
@@ -419,49 +744,705 @@ sub ssi {
     return $response->content;
 }
 
+# ------- Add a token to a remote URI's query string to vouch for access rights
+
+sub tokenwrapper {
+    my $uri=shift;
+    $uri=~s/^http\:\/\/([^\/]+)//;
+    $uri=~s/^\///;
+    $ENV{'user.environment'}=~/\/([^\/]+)\.id/;
+    my $token=$1;
+    if ($uri=~/^uploaded\/([^\/]+)\/([^\/]+)\/([^\/]+)(\?\.*)*$/) {
+	&appenv('userfile.'.$1.'/'.$2.'/'.$3 => $ENV{'request.course.id'});
+        return 'http://'.$hostname{ &homeserver($2,$1)}.'/'.$uri.
+               (($uri=~/\?/)?'&':'?').'token='.$token;
+    } else {
+	return '/adm/notfound.html';
+    }
+}
+    
+# --------------- Take an uploaded file and put it into the userfiles directory
+# input: name of form element, coursedoc=1 means this is for the course
+# output: url of file in userspace
+
+sub userfileupload {
+    my ($formname,$coursedoc)=@_;
+    my $fname=$ENV{'form.'.$formname.'.filename'};
+    $fname=~s/\\/\//g;
+    $fname=~s/^.*\/([^\/]+)$/$1/;
+    unless ($fname) { return 'error: no uploaded file'; }
+    chop($ENV{'form.'.$formname});
+# Create the directory if not present
+    my $docuname='';
+    my $docudom='';
+    my $docuhome='';
+    if ($coursedoc) {
+	$docuname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
+	$docudom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
+	$docuhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+    } else {
+        $docuname=$ENV{'user.name'};
+        $docudom=$ENV{'user.domain'};
+        $docuhome=$ENV{'user.home'};
+    }
+    return 
+        &finishuserfileupload($docuname,$docudom,$docuhome,$formname,$fname);
+}
+
+sub finishuserfileupload {
+    my ($docuname,$docudom,$docuhome,$formname,$fname)=@_;
+    my $path=$docudom.'/'.$docuname.'/';
+    my $filepath=$perlvar{'lonDocRoot'};
+    my @parts=split(/\//,$filepath.'/userfiles/'.$path);
+    my $count;
+    for ($count=4;$count<=$#parts;$count++) {
+        $filepath.="/$parts[$count]";
+        if ((-e $filepath)!=1) {
+	    mkdir($filepath,0777);
+        }
+    }
+# Save the file
+    {
+       my $fh=Apache::File->new('>'.$filepath.'/'.$fname);
+       print $fh $ENV{'form.'.$formname};
+    }
+# Notify homeserver to grep it
+#
+    if 
+(&reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$fname,$docuhome) eq 'ok') 
+    {
+#
+# Return the URL to it
+        return '/uploaded/'.$path.$fname;
+    } else {
+        return '/adm/notfound.html';
+    }    
+}
+
 # ------------------------------------------------------------------------- Log
 
 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');
+    foreach (keys %courselogs) {
+        my $crsid=$_;
+        if (&reply('log:'.$coursedombuf{$crsid}.':'.
+		          &escape($courselogs{$crsid}),
+		          $coursehombuf{$crsid}) 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};
+            }
+        }        
+    }
+    &logthis('Flushing access logs');
+    foreach (keys %accesshash) {
+        my $entry=$_;
+        $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
+        my %temphash=($entry => $accesshash{$entry});
+        if (&Apache::lonnet::put('nohist_resevaldata',\%temphash,$1,$2) eq 'ok') {
+	    delete $accesshash{$entry};
+        }
+    }
+    $dumpcount++;
+}
+
+sub courselog {
+    my $what=shift;
+    $what=time.':'.$what;
+    unless ($ENV{'request.course.id'}) { return ''; }
+    $coursedombuf{$ENV{'request.course.id'}}=
+       $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
+       $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
+    $coursehombuf{$ENV{'request.course.id'}}=
+       $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+    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 ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
+        $what.=':POST';
+	foreach (keys %ENV) {
+            if ($_=~/^form\.(.*)/) {
+		$what.=':'.$1.'='.$ENV{$_};
+            }
+        }
+    }
+    &courselog($what);
+}
+
+sub countacc {
+    my $url=&declutter(shift);
+    unless ($ENV{'request.course.id'}) { return ''; }
+    $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
+    my $key=$$.$processmarker.'_'.$dumpcount.'___'.$url.'___count';
+    if (defined($accesshash{$key})) {
+	$accesshash{$key}++;
+    } else {
+        $accesshash{$key}=1;
+    }
+}
+    
+# ----------------------------------------------------------- Check out an item
+
+sub checkout {
+    my ($symb,$tuname,$tudom,$tcrsid)=@_;
+    my $now=time;
+    my $lonhost=$perlvar{'lonHostID'};
+    my $infostr=&escape(
+                 'CHECKOUTTOKEN&'.
+                 $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 ($dummy,$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 get_scalar {
+    my ($string,$end) = @_;
+    my $value;
+    if ($$string =~ s/^([^&]*?)($end)/$2/) {
+	$value = $1;
+    } elsif ($$string =~ s/^([^&]*?)&//) {
+	$value = $1;
+    }
+    return &unescape($value);
+}
+
+sub array2str {
+  my (@array) = @_;
+  my $result=&arrayref2str(\@array);
+  $result=~s/^__ARRAY_REF__//;
+  $result=~s/__END_ARRAY_REF__$//;
+  return $result;
+}
+
+sub arrayref2str {
+  my ($arrayref) = @_;
+  my $result='__ARRAY_REF__';
+  foreach my $elem (@$arrayref) {
+    if(ref($elem) eq 'ARRAY') {
+      $result.=&arrayref2str($elem).'&';
+    } elsif(ref($elem) eq 'HASH') {
+      $result.=&hashref2str($elem).'&';
+    } elsif(ref($elem)) {
+      #print("Got a ref of ".(ref($elem))." skipping.");
+    } else {
+      $result.=&escape($elem).'&';
+    }
+  }
+  $result=~s/\&$//;
+  $result .= '__END_ARRAY_REF__';
+  return $result;
+}
+
+sub hash2str {
+  my (%hash) = @_;
+  my $result=&hashref2str(\%hash);
+  $result=~s/^__HASH_REF__//;
+  $result=~s/__END_HASH_REF__$//;
+  return $result;
+}
+
+sub hashref2str {
+  my ($hashref)=@_;
+  my $result='__HASH_REF__';
+  foreach (keys(%$hashref)) {
+    if (ref($_) eq 'ARRAY') {
+      $result.=&arrayref2str($_).'=';
+    } elsif (ref($_) eq 'HASH') {
+      $result.=&hashref2str($_).'=';
+    } elsif (ref($_)) {
+      $result.='=';
+      #print("Got a ref of ".(ref($_))." skipping.");
+    } else {
+	if ($_) {$result.=&escape($_).'=';} else { last; }
+    }
+
+    if(ref($hashref->{$_}) eq 'ARRAY') {
+      $result.=&arrayref2str($hashref->{$_}).'&';
+    } elsif(ref($hashref->{$_}) eq 'HASH') {
+      $result.=&hashref2str($hashref->{$_}).'&';
+    } elsif(ref($hashref->{$_})) {
+       $result.='&';
+      #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
+    } else {
+      $result.=&escape($hashref->{$_}).'&';
+    }
+  }
+  $result=~s/\&$//;
+  $result .= '__END_HASH_REF__';
+  return $result;
+}
+
+sub str2hash {
+    my ($string)=@_;
+    my ($hash)=&str2hashref('__HASH_REF__'.$string.'__END_HASH_REF__');
+    return %$hash;
+}
+
+sub str2hashref {
+  my ($string) = @_;
+
+  my %hash;
+
+  if($string !~ /^__HASH_REF__/) {
+      if (! ($string eq '' || !defined($string))) {
+	  $hash{'error'}='Not hash reference';
+      }
+      return (\%hash, $string);
+  }
+
+  $string =~ s/^__HASH_REF__//;
+
+  while($string !~ /^__END_HASH_REF__/) {
+      #key
+      my $key='';
+      if($string =~ /^__HASH_REF__/) {
+          ($key, $string)=&str2hashref($string);
+          if(defined($key->{'error'})) {
+              $hash{'error'}='Bad data';
+              return (\%hash, $string);
+          }
+      } elsif($string =~ /^__ARRAY_REF__/) {
+          ($key, $string)=&str2arrayref($string);
+          if($key->[0] eq 'Array reference error') {
+              $hash{'error'}='Bad data';
+              return (\%hash, $string);
+          }
+      } else {
+          $string =~ s/^(.*?)=//;
+	  $key=&unescape($1);
+      }
+      $string =~ s/^=//;
+
+      #value
+      my $value='';
+      if($string =~ /^__HASH_REF__/) {
+          ($value, $string)=&str2hashref($string);
+          if(defined($value->{'error'})) {
+              $hash{'error'}='Bad data';
+              return (\%hash, $string);
+          }
+      } elsif($string =~ /^__ARRAY_REF__/) {
+          ($value, $string)=&str2arrayref($string);
+          if($value->[0] eq 'Array reference error') {
+              $hash{'error'}='Bad data';
+              return (\%hash, $string);
+          }
+      } else {
+	  $value=&get_scalar(\$string,'__END_HASH_REF__');
+      }
+      $string =~ s/^&//;
+
+      $hash{$key}=$value;
+  }
+
+  $string =~ s/^__END_HASH_REF__//;
+
+  return (\%hash, $string);
+}
+
+sub str2array {
+    my ($string)=@_;
+    my ($array)=&str2arrayref('__ARRAY_REF__'.$string.'__END_ARRAY_REF__');
+    return @$array;
+}
+
+sub str2arrayref {
+  my ($string) = @_;
+  my @array;
+
+  if($string !~ /^__ARRAY_REF__/) {
+      if (! ($string eq '' || !defined($string))) {
+	  $array[0]='Array reference error';
+      }
+      return (\@array, $string);
+  }
+
+  $string =~ s/^__ARRAY_REF__//;
+
+  while($string !~ /^__END_ARRAY_REF__/) {
+      my $value='';
+      if($string =~ /^__HASH_REF__/) {
+          ($value, $string)=&str2hashref($string);
+          if(defined($value->{'error'})) {
+              $array[0] ='Array reference error';
+              return (\@array, $string);
+          }
+      } elsif($string =~ /^__ARRAY_REF__/) {
+          ($value, $string)=&str2arrayref($string);
+          if($value->[0] eq 'Array reference error') {
+              $array[0] ='Array reference error';
+              return (\@array, $string);
+          }
+      } else {
+	  $value=&get_scalar(\$string,'__END_ARRAY_REF__');
+      }
+      $string =~ s/^&//;
+
+      push(@array, $value);
+  }
+
+  $string =~ s/^__END_ARRAY_REF__//;
+
+  return (\@array, $string);
+}
+
+# -------------------------------------------------------------------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); }
+
+    $symb=&symbclean($symb);
+    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 $namevalue='';
+    foreach (keys %$storehash) {
+        $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
+    }
+    $namevalue=~s/\&$//;
+    &courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
+    return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
+}
+
+# -------------------------------------------------------------- Critical Store
+
+sub cstore {
+    my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
+    my $home='';
+
+    if ($stuname) { $home=&homeserver($stuname,$domain); }
+
+    $symb=&symbclean($symb);
+    if (!$symb) { unless ($symb=&symbread()) { return ''; } }
+
+    &devalidate($symb);
+
+    $symb=escape($symb);
+    if (!$namespace) { 
+       unless ($namespace=$ENV{'request.course.id'}) { 
+          return ''; 
+       } 
+    }
+    if (!$domain) { $domain=$ENV{'user.domain'}; }
+    if (!$stuname) { $stuname=$ENV{'user.name'}; }
+    if (!$home) { $home=$ENV{'user.home'}; }
+
     my $namevalue='';
-    map {
-        $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
-    } keys %storehash;
+    foreach (keys %$storehash) {
+        $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
+    }
     $namevalue=~s/\&$//;
-    return reply(
-     "store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
-		 "$ENV{'user.home'}");
+    &courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
+    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 {
+      $symb=&escape(&symbclean($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 {
+    foreach (split(/\&/,$answer)) {
 	my ($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'};$version++) {
+       foreach (split(/\:/,$returnhash{$version.':keys'})) {
+          $returnhash{$_}=$returnhash{$version.':'.$_};
+       }
+    }
     return %returnhash;
 }
 
@@ -470,35 +1451,35 @@ 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);
-           $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
+       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;
+           }
+           $returnhash{'url'}=&clutter($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)=@_;
@@ -511,7 +1492,7 @@ sub rolesinit {
     my $thesestr;
 
     if ($rolesdump ne '') {
-        map {
+        foreach (split(/&/,$rolesdump)) {
 	  if ($_!~/^rolesdef\&/) {
             my ($area,$role)=split(/=/,$_);
             $area=~s/\_\w\w$//;
@@ -529,6 +1510,7 @@ 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(/\//,$trole);
@@ -540,45 +1522,58 @@ sub rolesinit {
                       if (($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);
-        map {
+        }
+        my $adv=0;
+        my $author=0;
+        foreach (keys %allroles) {
             %thesepriv=();
-            map {
+            if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
+            if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
+            foreach (split(/:/,$allroles{$_})) {
                 if ($_ 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}.=$restrictions;
                         }
                     }
                 }
-            } split(/:/,$allroles{$_});
+            }
             $thesestr='';
-            map { $thesestr.=':'.$_.'&'.$thesepriv{$_}; } keys %thesepriv;
+            foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
             $userroles.='user.priv.'.$_.'='.$thesestr."\n";
-        } keys %allroles;            
+        }
+        $userroles.='user.adv='.$adv."\n".
+	            'user.author='.$author."\n";
+        $ENV{'user.adv'}=$adv;
     }
     return $userroles;  
 }
@@ -586,195 +1581,419 @@ sub rolesinit {
 # --------------------------------------------------------------- get interface
 
 sub get {
-   my ($namespace,@storearr)=@_;
+   my ($namespace,$storearr,$udomain,$uname)=@_;
    my $items='';
-   map {
+   foreach (@$storearr) {
        $items.=escape($_).'&';
-   } @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);
+   if ( $#pairs==0 && $pairs[0] =~ /^(con_lost|error|no_such_host)/i) {
+     return @pairs;
+   }
    my %returnhash=();
    my $i=0;
-   map {
+   foreach (@$storearr) {
       $returnhash{$_}=unescape($pairs[$i]);
       $i++;
-   } @storearr;
+   }
    return %returnhash;
 }
 
 # --------------------------------------------------------------- del interface
 
 sub del {
-   my ($namespace,@storearr)=@_;
+   my ($namespace,$storearr,$udomain,$uname)=@_;
    my $items='';
-   map {
+   foreach (@$storearr) {
        $items.=escape($_).'&';
-   } @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,$regexp)=@_;
+   if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+   if (!$uname) { $uname=$ENV{'user.name'}; }
+   my $uhome=&homeserver($uname,$udomain);
+   if ($regexp) {
+       $regexp=&escape($regexp);
+   } else {
+       $regexp='.';
+   }
+   my $rep=reply("dump:$udomain:$uname:$namespace:$regexp",$uhome);
    my @pairs=split(/\&/,$rep);
    my %returnhash=();
-   map {
+   foreach (@pairs) {
       my ($key,$value)=split(/=/,$_);
       $returnhash{unescape($key)}=unescape($value);
-   } @pairs;
+   }
    return %returnhash;
 }
 
 # --------------------------------------------------------------- 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;
+   foreach (keys %$storehash) {
+       $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
+   }
+   $items=~s/\&$//;
+   return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
+}
+
+# ------------------------------------------------------ critical put interface
+
+sub cput {
+   my ($namespace,$storehash,$udomain,$uname)=@_;
+   if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+   if (!$uname) { $uname=$ENV{'user.name'}; }
+   my $uhome=&homeserver($uname,$udomain);
+   my $items='';
+   foreach (keys %$storehash) {
+       $items.=escape($_).'='.escape($$storehash{$_}).'&';
+   }
    $items=~s/\&$//;
-   return reply("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
-                 $ENV{'user.home'});
+   return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
 }
 
 # -------------------------------------------------------------- eget interface
 
 sub eget {
-   my ($namespace,@storearr)=@_;
+   my ($namespace,$storearr,$udomain,$uname)=@_;
    my $items='';
-   map {
+   foreach (@$storearr) {
        $items.=escape($_).'&';
-   } @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 $i=0;
-   map {
+   foreach (@$storearr) {
       $returnhash{$_}=unescape($pairs[$i]);
       $i++;
-   } @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);
 
-    if (($uri=~/^adm\//) && ($priv eq 'bre')) {
+# Free bre access to adm and meta resources
+
+    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') {
+        my $copyright=&metadata($uri,'copyright');
+	if ($copyright eq 'public') { return 'F'; }
+        if ($copyright eq 'priv') {
+            $uri=~/([^\/]+)\/([^\/]+)\//;
+	    unless (($ENV{'user.name'} eq $2) && ($ENV{'user.domain'} eq $1)) {
+		return '';
+            }
+        }
+        if ($copyright eq 'domain') {
+            $uri=~/([^\/]+)\/([^\/]+)\//;
+	    unless (($ENV{'user.domain'} eq $1) ||
+                 ($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $1)) {
+		return '';
+            }
+        }
+        if ($ENV{'request.role'}=~ /li\.\//) {
+            # Library role, so allow browsing of resources in this domain.
+            return 'F';
+        }
+    }
+    # Domain coordinator is trying to create a course
+    if (($priv eq 'ccc') && ($ENV{'request.role'} =~ /^dc\./)) {
+        # uri is the requested domain in this case.
+        # comparison to 'request.role.domain' shows if the user has selected
+        # a role of dc for the domain in question. 
+        return 'F' if ($uri eq $ENV{'request.role.domain'});
+    }
 
     my $thisallowed='';
-    if ($ENV{'user.priv./'}=~/$priv\&([^\:]*)/) {
+    my $statecond=0;
+    my $courseprivid='';
+
+# Course
+
+    if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
        $thisallowed.=$1;
     }
-    if ($ENV{'user.priv./'.(split(/\//,$uri))[0].'/'}=~/$priv\&([^\:]*)/) {
+
+# Domain
+
+    if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
+       =~/$priv\&([^\:]*)/) {
        $thisallowed.=$1;
     }
 
-# Full access at system or domain level? Exit.
+# 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, 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 $checkreferer=1;
+       my ($match,$cond)=&is_on_map($uri);
+       if ($match) {
+           $statecond=$cond;
+           if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
+               =~/$priv\&([^\:]*)/) {
+               $thisallowed.=$1;
+               $checkreferer=0;
+           }
        }
+       
+       if ($checkreferer) {
+	  my $refuri=$ENV{'httpref.'.$orguri};
+            unless ($refuri) {
+                foreach (keys %ENV) {
+		    if ($_=~/^httpref\..*\*/) {
+			my $pattern=$_;
+                        $pattern=~s/^httpref\.\/res\///;
+                        $pattern=~s/\*/\[\^\/\]\+/g;
+                        $pattern=~s/\//\\\//g;
+                        if ($orguri=~/$pattern/) {
+			    $refuri=$ENV{$_};
+                        }
+                    }
+                }
+            }
 
-# uri is refering to an individual resource; user needs to be in a course
+         if ($refuri) { 
+	  $refuri=&declutter($refuri);
+          my ($match,$cond)=&is_on_map($refuri);
+            if ($match) {
+              my $refstatecond=$cond;
+              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?
+#
+
+    if ($thisallowed=~/F/) {
+	return 'F';
+    }
+
+    unless ($thisallowed) {
+        return '';
+    }
 
-       unless(defined($ENV{'request.course.id'})) {
-	   return '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
+#
+
+# 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'},
+                            $ENV{'user.home'},
+                            'Locked by res: '.$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'},
+                            $ENV{'user.home'},
+                            'Locked by priv: '.$priv.' for '.$uri.' due to '.
+                            $cdom.'/'.$cnum.'/'.$csec.' expire '.
+                            $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
+		       return '';
+                   }
+               }
+	   }
        }
+    }
+   
+#
+# Rest of the restrictions depend on selected course
+#
 
-# Get access priviledges for course
+    unless ($ENV{'request.course.id'}) {
+       return '1';
+    }
+
+#
+# Now user is definitely in a course
+#
 
-       if ($ENV{'user.priv./'.$ENV{'request.course.id'}}=~/$priv\&([^\:]*)/) {
-          $thisallowed.=$1;
+
+# Course preferences
+
+   if ($thisallowed=~/C/) {
+       my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
+       my $unamedom=$ENV{'user.name'}.':'.$ENV{'user.domain'};
+       if ($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 '';
        }
 
-# 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=$1;
-	  }
+       if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.users.denied'}
+	   =~/$unamedom/) {
+           &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
+                'Denied by user: '.$priv.' for '.$uri.' as '.$unamedom.' in '.
+                $ENV{'request.course.id'});
+           return '';
        }
+   }
 
-       if ($uricond>=0) {
+# Resource preferences
 
-# The resource is part of the course
-# If user had full access on course level, go ahead
+   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 '';
 
-           if ($thisallowed=~/F/) {
-	       return 'F';
            }
+       }
+   }
 
-# Restricted by state?
+# Restricted by state or randomout?
 
-           if ($thisallowed=~/X/) {
-	      if (&condval($uricond)) {
-	         return '2';
-              } else {
-                 return '';
-              }
-	   }
-       }
-    }
-    return $thisallowed;
+   if ($thisallowed=~/X/) {
+      if ($ENV{'acc.randomout'}) {
+         my $symb=&symbread($uri,1);
+         if (($symb) && ($ENV{'acc.randomout'}=~/\&$symb\&/)) { 
+            return ''; 
+         }
+      }
+      if (&condval($statecond)) {
+	 return '2';
+      } else {
+         return '';
+      }
+   }
+
+   return 'F';
 }
 
-# ---------------------------------------------------------- Refresh State Info
+# --------------------------------------------------- Is a resource on the map?
 
-sub refreshstate {
+sub is_on_map {
+    my $uri=&declutter(shift);
+    my @uriparts=split(/\//,$uri);
+    my $filename=$uriparts[$#uriparts];
+    my $pathname=$uri;
+    $pathname=~s/\/$filename$//;
+    my $match=($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
+	       /\&$filename\:([\d\|]+)\&/);
+    if ($match) {
+       return (1,$1);
+   } else {
+       return (0,0);
+   }
 }
 
 # ----------------------------------------------------------------- Define Role
@@ -782,7 +2001,7 @@ sub refreshstate {
 sub definerole {
   if (allowed('mcr','/')) {
     my ($rolename,$sysrole,$domrole,$courole)=@_;
-    map {
+    foreach (split('/',$sysrole)) {
 	my ($crole,$cqual)=split(/\&/,$_);
         if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
         if ($pr{'cr:s'}=~/$crole\&/) {
@@ -790,8 +2009,8 @@ sub definerole {
                return "refused:s:$crole&$cqual"; 
             }
         }
-    } split('/',$sysrole);
-    map {
+    }
+    foreach (split('/',$domrole)) {
 	my ($crole,$cqual)=split(/\&/,$_);
         if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
         if ($pr{'cr:d'}=~/$crole\&/) {
@@ -799,8 +2018,8 @@ sub definerole {
                return "refused:d:$crole&$cqual"; 
             }
         }
-    } split('/',$domrole);
-    map {
+    }
+    foreach (split('/',$courole)) {
 	my ($crole,$cqual)=split(/\&/,$_);
         if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
         if ($pr{'cr:c'}=~/$crole\&/) {
@@ -808,7 +2027,7 @@ sub definerole {
                return "refused:c:$crole&$cqual"; 
             }
         }
-    } split('/',$courole);
+    }
     my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
                 "$ENV{'user.domain'}:$ENV{'user.name'}:".
 	        "rolesdef_$rolename=".
@@ -819,25 +2038,91 @@ sub definerole {
   }
 }
 
-# ------------------------------------------------------------------ Plain Text
+# ---------------- Make a metadata query against the network of library servers
 
-sub plaintext {
-    my $short=shift;
-    return $prp{$short};
+sub metadata_query {
+    my ($query,$custom,$customshow,$server_array)=@_;
+    my %rhash;
+    my @server_list = (defined($server_array) ? @$server_array
+                                              : keys(%libserv) );
+    for my $server (@server_list) {
+	unless ($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
+# ----------------------------------------- Send log queries and wait for reply
+
+sub log_query {
+    my ($uname,$udom,$query,%filters)=@_;
+    my $uhome=&homeserver($uname,$udom);
+    if ($uhome eq 'no_host') { return 'error: no_host'; }
+    my $uhost=$hostname{$uhome};
+    my $command=&escape(join(':',map{$_.'='.$filters{$_}} keys %filters));
+    my $queryid=&reply("querysend:".$query.':'.$udom.':'.$uname.':'.$command,
+                       $uhome);
+    unless ($queryid=~/^$uhost\_/) { return 'error: '.$queryid; }
+    return get_query_reply($queryid);
+}
+
+sub get_query_reply {
+    my $queryid=shift;
+    my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
+    my $reply='';
+    for (1..100) {
+	sleep 2;
+        if (-e $replyfile.'.end') {
+	    if (my $fh=Apache::File->new($replyfile)) {
+               $reply.=<$fh>;
+               $fh->close;
+	   } else { return 'error: reply_file_error'; }
+           return &unescape($reply);
+	}
+    }
+    return 'timeout:'.$queryid;
+}
+
+sub courselog_query {
+#
+# possible filters:
+# url: url or symb
+# username
+# domain
+# action: view, submit, grade
+# start: timestamp
+# end: timestamp
+#
+    my (%filters)=@_;
+    unless ($ENV{'request.course.id'}) { return 'no_course'; }
+    if ($filters{'url'}) {
+	$filters{'url'}=&symbclean(&declutter($filters{'url'}));
+        $filters{'url'}=~s/\.(\w+)$/(\\.\\d+)*\\.$1/;
+        $filters{'url'}=~s/\.(\w+)\_\_\_/(\\.\\d+)*\\.$1/;
+    }
+    my $cname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
+    my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
+    return &log_query($cname,$cdom,'courselog',%filters);
+}
 
-sub fileembstyle {
-    my $ending=shift;
-    return $fe{$ending};
+sub userlog_query {
+    my ($uname,$udom,%filters)=@_;
+    return &log_query($uname,$udom,'userlog',%filters);
 }
 
-# ------------------------------------------------------------ Description Text
+# ------------------------------------------------------------------ Plain Text
 
-sub filedecription {
-    my $ending=shift;
-    return $fd{$ending};
+sub plaintext {
+    my $short=shift;
+    return $prp{$short};
 }
 
 # ----------------------------------------------------------------- Assign Role
@@ -845,29 +2130,262 @@ 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
+# Overrides without validation
+
+sub modifyuserauth {
+    my ($udom,$uname,$umode,$upass)=@_;
+    my $uhome=&homeserver($uname,$udom);
+    unless (&allowed('mau',$udom)) { return 'refused'; }
+    &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
+             $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
+             ' in domain '.$ENV{'request.role.domain'});  
+    my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
+		     &escape($upass),$uhome);
+    &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
+        'Authentication changed for '.$udom.', '.$uname.', '.$umode.
+         '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
+    &log($udom,,$uname,$uhome,
+        'Authentication changed by '.$ENV{'user.domain'}.', '.
+                                     $ENV{'user.name'}.', '.$umode.
+         '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
+    unless ($reply eq 'ok') {
+        &logthis('Authentication mode error: '.$reply);
+	return 'error: '.$reply;
+    }   
+    return 'ok';
+}
+
+# --------------------------------------------------------------- Modify a user
+
+sub modifyuser {
+    my ($udom,    $uname, $uid,
+        $umode,   $upass, $first,
+        $middle,  $last,  $gene,
+        $forceid, $desiredhome)=@_;
+    $udom=~s/\W//g;
+    $uname=~s/\W//g;
+    &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
+             $umode.', '.$first.', '.$middle.', '.
+	     $last.', '.$gene.'(forceid: '.$forceid.')'.
+             (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
+                                     ' desiredhome not specified'). 
+             ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
+             ' in domain '.$ENV{'request.role.domain'});
+    my $uhome=&homeserver($uname,$udom,'true');
+# ----------------------------------------------------------------- Create User
+    if (($uhome eq 'no_host') && ($umode) && ($upass)) {
+        my $unhome='';
+        if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) { 
+            $unhome = $desiredhome;
+	} elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
+	    $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+        } else { # load balancing routine for determining $unhome
+            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: unable to find a home server for '.$uname.
+                   ' in domain '.$udom;
+        }
+        my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
+                         &escape($upass),$unhome);
+	unless ($reply eq 'ok') {
+            return 'error: '.$reply;
+        }   
+        $uhome=&homeserver($uname,$udom,'true');
+        if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
+	    return 'error: verify home';
+        }
+    }   # End of creation of new user
+# ---------------------------------------------------------------------- Add ID
+    if ($uid) {
+       $uid=~tr/A-Z/a-z/;
+       my %uidhash=&idrget($udom,$uname);
+       if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/) 
+         && (!$forceid)) {
+	  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 ($names{'firstname'} =~ m/^error:.*/) { %names=(); }
+    if ($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,$forceid,$desiredhome)=@_;
+    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,$forceid,
+         $desiredhome);
+    unless ($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='';
+    foreach (keys %prefs) {
+	$cstring.=escape($_).'='.escape($prefs{$_}).'&';
+    }
+    $cstring=~s/\&$//;
+    return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
+}
+
+# ---------------------------------------------------------- Make/modify course
+
+sub createcourse {
+    my ($udom,$description,$url,$course_server,$nonstandard)=@_;
+    $url=&declutter($url);
+    my $cid='';
+    unless (&allowed('ccc',$udom)) {
+        return 'refused';
+    }
+# ------------------------------------------------------------------- Create ID
+   my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+       unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+# ----------------------------------------------- Make sure that does not exist
+   my $uhome=&homeserver($uname,$udom,'true');
+   unless (($uhome eq '') || ($uhome eq 'no_host')) {
+       $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+        unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+       $uhome=&homeserver($uname,$udom,'true');       
+       unless (($uhome eq '') || ($uhome eq 'no_host')) {
+           return 'error: unable to generate unique course-ID';
+       } 
+   }
+# ------------------------------------------------ Check supplied server name
+    $course_server = $ENV{'user.homeserver'} if (! defined($course_server));
+    if (! exists($libserv{$course_server})) {
+        return 'error:bad server name '.$course_server;
+    }
+# ------------------------------------------------------------- Make the course
+    my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
+                      $course_server);
+    unless ($reply eq 'ok') { return 'error: '.$reply; }
+    $uhome=&homeserver($uname,$udom,'true');
+    if (($uhome eq '') || ($uhome eq 'no_host')) { 
+	return 'error: no such course';
+    }
+# ----------------------------------------------------------------- Course made
+    my $topurl=$url;
+    unless ($nonstandard) {
+# ------------------------------------------ For standard courses, make top url
+        my $mapurl=&clutter($url);
+        if ($mapurl eq '/res/') { $mapurl=''; }
+        $ENV{'form.initmap'}=(<<ENDINITMAP);
+<map>
+<resource id="1" type="start"></resource>
+<resource id="2" src="$mapurl"></resource>
+<resource id="3" type="finish"></resource>
+<link index="1" from="1" to="2"></link>
+<link index="2" from="2" to="3"></link>
+</map>
+ENDINITMAP
+        $topurl=&declutter(
+        &finishuserfileupload($uname,$udom,$uhome,'initmap','default.sequence')
+                          );
+    }
+# ----------------------------------------------------------- Write preferences
+    &writecoursepref($udom.'_'.$uname,
+                     ('description' => $description,
+                      'url'         => $topurl));
+    return '/'.$udom.'/'.$uname;
+}
+
 # ---------------------------------------------------------- Assign Custom Role
 
 sub assigncustomrole {
@@ -895,51 +2413,98 @@ sub revokecustomrole {
 # ------------------------------------------------------------ Directory lister
 
 sub dirlist {
-    my $uri=shift;
+    my ($uri,$userdomain,$username,$alternateDirectoryRoot)=@_;
+
     $uri=~s/^\///;
     $uri=~s/\/$//;
-    my ($res,$udom,$uname,@rest)=split(/\//,$uri);
-    if ($udom) {
-     if ($uname) {
-       my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,
-                      homeserver($uname,$udom));
-       return split(/:/,$listing);
-     } else {
-       my $tryserver;
-       my %allusers=();
-       foreach $tryserver (keys %libserv) {
-	  if ($hostdom{$tryserver} eq $udom) {
-             my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.$udom,
-			       $tryserver);
-             if (($listing ne 'no_such_dir') && ($listing ne 'empty')
-              && ($listing ne 'con_lost')) {
-                map {
-                  my ($entry,@stat)=split(/&/,$_);
-                  $allusers{$entry}=1;
-                } split(/:/,$listing);
-             }
-	  }
-       }
-       my $alluserstr='';
-       map {
-           $alluserstr.=$_.'&user:';
-       } sort keys %allusers;
-       $alluserstr=~s/:$//;
-       return split(/:/,$alluserstr);
-     } 
-   } else {
-       my $tryserver;
-       my %alldom=();
-       foreach $tryserver (keys %libserv) {
-	   $alldom{$hostdom{$tryserver}}=1;
-       }
-       my $alldomstr='';
-       map {
-          $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
-       } sort keys %alldom;
-       $alldomstr=~s/:$//;
-       return split(/:/,$alldomstr);       
-   }
+    my ($udom, $uname);
+    (undef,$udom,$uname)=split(/\//,$uri);
+    if(defined($userdomain)) {
+        $udom = $userdomain;
+    }
+    if(defined($username)) {
+        $uname = $username;
+    }
+
+    my $dirRoot = $perlvar{'lonDocRoot'};
+    if(defined($alternateDirectoryRoot)) {
+        $dirRoot = $alternateDirectoryRoot;
+        $dirRoot =~ s/\/$//;
+    }
+
+    if($udom) {
+        if($uname) {
+            my $listing=reply('ls:'.$dirRoot.'/'.$uri,
+                              homeserver($uname,$udom));
+            return split(/:/,$listing);
+        } elsif(!defined($alternateDirectoryRoot)) {
+            my $tryserver;
+            my %allusers=();
+            foreach $tryserver (keys %libserv) {
+                if($hostdom{$tryserver} eq $udom) {
+                    my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.
+                                      $udom, $tryserver);
+                    if (($listing ne 'no_such_dir') && ($listing ne 'empty')
+                        && ($listing ne 'con_lost')) {
+                        foreach (split(/:/,$listing)) {
+                            my ($entry,@stat)=split(/&/,$_);
+                            $allusers{$entry}=1;
+                        }
+                    }
+                }
+            }
+            my $alluserstr='';
+            foreach (sort keys %allusers) {
+                $alluserstr.=$_.'&user:';
+            }
+            $alluserstr=~s/:$//;
+            return split(/:/,$alluserstr);
+        } else {
+            my @emptyResults = ();
+            push(@emptyResults, 'missing user name');
+            return split(':',@emptyResults);
+        }
+    } elsif(!defined($alternateDirectoryRoot)) {
+        my $tryserver;
+        my %alldom=();
+        foreach $tryserver (keys %libserv) {
+            $alldom{$hostdom{$tryserver}}=1;
+        }
+        my $alldomstr='';
+        foreach (sort keys %alldom) {
+            $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
+        }
+        $alldomstr=~s/:$//;
+        return split(/:/,$alldomstr);       
+    } else {
+        my @emptyResults = ();
+        push(@emptyResults, 'missing domain');
+        return split(':',@emptyResults);
+    }
+}
+
+# --------------------------------------------- GetFileTimestamp
+# This function utilizes dirlist and returns the date stamp for
+# when it was last modified.  It will also return an error of -1
+# if an error occurs
+
+sub GetFileTimestamp {
+    my ($studentDomain,$studentName,$filename,$root)=@_;
+    $studentDomain=~s/\W//g;
+    $studentName=~s/\W//g;
+    my $subdir=$studentName.'__';
+    $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
+    my $proname="$studentDomain/$subdir/$studentName";
+    $proname .= '/'.$filename;
+    my @dir = &Apache::lonnet::dirlist($proname, $studentDomain, $studentName,
+                                       $root);
+    my $fileStat = $dir[0];
+    my @stats = split('&', $fileStat);
+    if($stats[0] ne 'empty' && $stats[0] ne 'no_such_dir') {
+        return $stats[9];
+    } else {
+        return -1;
+    }
 }
 
 # -------------------------------------------------------- Value of a Condition
@@ -956,11 +2521,19 @@ sub directcondval {
 sub condval {
     my $condidx=shift;
     my $result=0;
+    my $allpathcond='';
+    foreach (split(/\|/,$condidx)) {
+       if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
+	   $allpathcond.=
+               '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
+       }
+    }
+    $allpathcond=~s/\|$//;
     if ($ENV{'request.course.id'}) {
-       if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$condidx})) {
+       if ($allpathcond) {
           my $operand='|';
 	  my @stack;
-          map {
+           foreach ($allpathcond=~/(\d+|\(|\)|\&|\|)/g) {
               if ($_ eq '(') {
                  push @stack,($operand,$result)
               } elsif ($_ eq ')') {
@@ -978,32 +2551,416 @@ sub condval {
                      $result=$result>$new?$new:$result;
                   } else {
                      $result=$result>$new?$result:$new;
-                  }                  
+                  }
               }
-          } ($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$condidx}=~
-             /(\d+|\(|\)|\&|\|)/g);
+          }
        }
     }
     return $result;
 }
 
+# ---------------------------------------------------- Devalidate courseresdata
+
+sub devalidatecourseresdata {
+    my ($coursenum,$coursedomain)=@_;
+    my $hashid=$coursenum.':'.$coursedomain;
+    delete $courseresdatacache{$hashid.'.time'};
+}
+
+# --------------------------------------------------- Course Resourcedata Query
+
+sub courseresdata {
+    my ($coursenum,$coursedomain,@which)=@_;
+    my $coursehom=&homeserver($coursenum,$coursedomain);
+    my $hashid=$coursenum.':'.$coursedomain;
+    my $dodump=0;
+    if (!defined($courseresdatacache{$hashid.'.time'})) {
+	$dodump=1;
+    } else {
+	if (time-$courseresdatacache{$hashid.'.time'}>300) { $dodump=1; }
+    }
+    if ($dodump) {
+	my %dumpreply=&dump('resourcedata',$coursedomain,$coursenum);
+	my ($tmp) = keys(%dumpreply);
+	if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
+	    $courseresdatacache{$hashid.'.time'}=time;
+	    $courseresdatacache{$hashid}=\%dumpreply;
+	}
+    }
+    foreach my $item (@which) {
+	if ($courseresdatacache{$hashid}->{$item}) {
+	    return $courseresdatacache{$hashid}->{$item};
+	}
+    }
+    return '';
+}
+
 # --------------------------------------------------------- Value of a Variable
 
-sub varval {
-    my ($realm,$space,@components)=split(/\./,shift);
-    my $value='';
-    if ($realm eq 'user') {
-	if ($space=~/^resource/) {
-	    $space=~s/^resource\[//;
-            $space=~s/\]$//;
+sub EXT {
+    my ($varname,$symbparm,$udom,$uname,)=@_;
 
+    unless ($varname) { return ''; }
+
+    #get real user name/domain, courseid and symb
+    my $courseid;
+    if (!($uname && $udom)) {
+      (my $cursymb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
+      if (!$symbparm) {	$symbparm=$cursymb; }
+    } else {
+	$courseid=$ENV{'request.course.id'};
+    }
+
+    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 ($realm eq 'user') {
+# --------------------------------------------------------------- user.resource
+	if ($space eq 'resource') {
+	    my %restored=&restore(undef,undef,$udom,$uname);
+            return $restored{$qualifierrest};
+# ----------------------------------------------------------------- user.access
+        } elsif ($space eq 'access') {
+	    # FIXME - not supporting calls for a specific user
+            return &allowed($qualifier,$rest);
+# ------------------------------------------ user.preferences, user.environment
+        } elsif (($space eq 'preferences') || ($space eq 'environment')) {
+	    if (($uname eq $ENV{'user.name'}) &&
+		($udom eq $ENV{'user.domain'})) {
+		return $ENV{join('.',('environment',$qualifierrest))};
+	    } else {
+		my %returnhash=&userenvironment($udom,$uname,$qualifierrest);
+		return $returnhash{$qualifierrest};
+	    }
+# ----------------------------------------------------------------- user.course
+        } elsif ($space eq 'course') {
+	    # FIXME - not supporting calls for a specific user
+            return $ENV{join('.',('request.course',$qualifier))};
+# ------------------------------------------------------------------- user.role
+        } elsif ($space eq 'role') {
+	    # FIXME - not supporting calls for a specific user
+            my ($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 $udom;
+# ------------------------------------------------------------------- user.name
+        } elsif ($space eq 'name') {
+            return $uname;
+# ---------------------------------------------------- Any other user namespace
         } else {
+            my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
+            my %reply=&get($space,[$item]);
+            return $reply{$item};
+        }
+    } elsif ($realm eq 'query') {
+# ---------------------------------------------- pull stuff out of query string
+        &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},[$space]);
+	return $ENV{'form.'.$space}; 
+   } 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 $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
+    } elsif ($realm eq 'resource') {
+
+	if ($courseid eq $ENV{'request.course.id'}) {
+
+	    #print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
+
+# ----------------------------------------------------- Cascading lookup scheme
+	    if (!$symbparm) { $symbparm=&symbread(); }
+	    my $symbp=$symbparm;
+	    my $mapp=(split(/\_\_\_/,$symbp))[0];
+
+	    my $symbparm=$symbp.'.'.$spacequalifierrest;
+	    my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
+
+	    my $section;
+	    if (($ENV{'user.name'} eq $uname) &&
+		($ENV{'user.domain'} eq $udom)) {
+		$section=$ENV{'request.course.sec'};
+	    } else {
+		$section=&usection($udom,$uname,$courseid);
+	    }
+
+	    my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
+	    my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
+	    my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
+
+	    my $courselevel=$courseid.'.'.$spacequalifierrest;
+	    my $courselevelr=$courseid.'.'.$symbparm;
+	    my $courselevelm=$courseid.'.'.$mapparm;
+
+# ----------------------------------------------------------- first, check user
+	    my %resourcedata=&get('resourcedata',
+				  [$courselevelr,$courselevelm,$courselevel],
+				 $udom,$uname);
+	    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 ".
+			     $uname." at ".$udom.": ".
+			     $resourcedata{$courselevelr}."</font>");
+		}
+	    }
+
+# -------------------------------------------------------- second, check course
+
+	    my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
+					  $ENV{'course.'.$courseid.'.domain'},
+					  ($seclevelr,$seclevelm,$seclevel,
+					   $courselevelr,$courselevelm,
+					   $courselevel));
+	    if ($coursereply) { return $coursereply; }
+
+# ------------------------------------------------------ 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 $filename;
+	if (!$symbparm) { $symbparm=&symbread(); }
+	if ($symbparm) {
+	    $filename=(split(/\_\_\_/,$symbparm))[2];
+	} else {
+	    $filename=$ENV{'request.filename'};
+	}
+	my $metadata=&metadata($filename,$spacequalifierrest);
+	if ($metadata) { return $metadata; }
+	$metadata=&metadata($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,
+				     $symbparm,$udom,$uname);
+		if ($partgeneral) { return $partgeneral; }
+	    } else {
+		my $resourcegeneral=&EXT('resource.0.'.$qualifierrest,
+					 $symbparm,$udom,$uname);
+		if ($resourcegeneral) { return $resourcegeneral; }
+	    }
+	}
+
+# ---------------------------------------------------- Any other user namespace
+    } elsif ($realm eq 'environment') {
+# ----------------------------------------------------------------- environment
+	if (($uname eq $ENV{'user.name'})&&($udom eq $ENV{'user.domain'})) {
+	    return $ENV{'environment.'.$spacequalifierrest};
+	} else {
+	    my %returnhash=&userenvironment($udom,$uname,
+					    $spacequalifierrest);
+	    return $returnhash{$spacequalifierrest};
+	}
     } elsif ($realm eq 'system') {
+# ----------------------------------------------------------------- system.time
+	if ($space eq 'time') {
+	    return time;
+        }
+    }
+    return '';
+}
+
+# ---------------------------------------------------------------- Get metadata
+
+sub metadata {
+    my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
+
+    $uri=&declutter($uri);
+    my $filename=$uri;
+    $uri=~s/\.meta$//;
+#
+# Is the metadata already cached?
+# Look at timestamp of caching
+# Everything is cached by the main uri, libraries are never directly cached
+#
+    unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600 && !defined($liburi)) {
+#
+# Is this a recursive call for a library?
+#
+        if ($liburi) {
+	    $liburi=&declutter($liburi);
+            $filename=$liburi;
+        }
+        my %metathesekeys=();
+        unless ($filename=~/\.meta$/) { $filename.='.meta'; }
+	my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
+        my $parser=HTML::LCParser->new(\$metastring);
+        my $token;
+        undef %metathesekeys;
+        while ($token=$parser->get_token) {
+           if ($token->[0] eq 'S') {
+	     if (defined($token->[2]->{'package'})) {
+#
+# This is a package - get package info
+#
+	      my $package=$token->[2]->{'package'};
+	      my $keyroot='';
+              if ($prefix) {
+		  $keyroot.=$prefix;
+              } else {
+                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;
+	      }
+              foreach (keys %packagetab) {
+		  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;
+		      }
+                  }
+              }
+             } else {
+#
+# This is not a package - some other kind of start tag
+# 
+              my $entry=$token->[1];
+              my $unikey;
+              if ($entry eq 'import') {
+                 $unikey='';
+              } else {
+                 $unikey=$entry;
+	      }
+              if ($prefix) {
+		  $unikey.=$prefix;
+              } else {
+                if (defined($token->[2]->{'part'})) { 
+                   $unikey.='_'.$token->[2]->{'part'}; 
+	        }
+	      }
+              if (defined($token->[2]->{'id'})) { 
+                 $unikey.='_'.$token->[2]->{'id'}; 
+	      }
+
+             if ($entry eq 'import') {
+#
+# Importing a library here
+#                
+                 if ($depthcount<20) {
+		     my $location=$parser->get_text('/import');
+		     my $dir=$filename;
+		     $dir=~s|[^/]*$||;
+		     $location=&filelocation($dir,$location);
+		     foreach (sort(split(/\,/,&metadata($uri,'keys',
+							$location,$unikey,
+							$depthcount+1)))) {
+                         $metathesekeys{$_}=1;
+		     }
+		 }
+             } else { 
+
+              if (defined($token->[2]->{'name'})) { 
+                 $unikey.='_'.$token->[2]->{'name'}; 
+	      }
+              $metathesekeys{$unikey}=1;
+              foreach (@{$token->[3]}) {
+		  $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
+              }
+              unless (
+                 $metacache{$uri.':'.$unikey}=&HTML::Entities::decode($parser->get_text('/'.$entry))
+		      ) { $metacache{$uri.':'.$unikey}=
+			      $metacache{$uri.':'.$unikey.'.default'};
+		      }
+# end of not-a-package not-a-library import
+	   }
+# end of not-a-package start tag
+	  }
+# the next is the end of "start tag"
+	 }
+       }
+       $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
+	&metadata_generate_part0(\%metathesekeys,\%metacache,$uri);
+       $metacache{$uri.':allpossiblekeys'}=join(',',keys %metathesekeys);
+       $metacache{$uri.':cachedtimestamp'}=time;
+# this is the end of "was not already recently cached
+    }
+    return $metacache{$uri.':'.$what};
+}
+
+sub metadata_generate_part0 {
+    my ($metadata,$metacache,$uri) = @_;
+    my %allnames;
+    foreach my $metakey (sort keys %$metadata) {
+	if ($metakey=~/^parameter\_(.*)/) {
+	  my $part=$$metacache{$uri.':'.$metakey.'.part'};
+	  my $name=$$metacache{$uri.':'.$metakey.'.name'};
+	  if (! exists($$metadata{'parameter_0_'.$name})) {
+	    $allnames{$name}=$part;
+	  }
+	}
+    }
+    foreach my $name (keys(%allnames)) {
+      $$metadata{"parameter_0_$name"}=1;
+      my $key="$uri:parameter_0_$name";
+      $$metacache{"$key.part"}='0';
+      $$metacache{"$key.name"}=$name;
+      $$metacache{"$key.type"}=$$metacache{$uri.':parameter_'.
+					   $allnames{$name}.'_'.$name.
+					   '.type'};
+      my $olddis=$$metacache{$uri.':parameter_'.$allnames{$name}.'_'.$name.
+			     '.display'};
+      my $expr='\\[Part: '.$allnames{$name}.'\\]';
+      $olddis=~s/$expr/\[Part: 0\]/;
+      $$metacache{"$key.display"}=$olddis;
     }
-    return $value;
 }
 
 # ------------------------------------------------- Update symbolic store links
@@ -1014,10 +2971,10 @@ sub symblist {
     my %hash;
     if (($ENV{'request.course.fn'}) && (%newhash)) {
         if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
-                      &GDBM_WRCREAT,0640)) {
-	    map {
+                      &GDBM_WRCREAT(),0640)) {
+	    foreach (keys %newhash) {
                 $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
-            } keys %newhash;
+            }
             if (untie(%hash)) {
 		return 'ok';
             }
@@ -1026,16 +2983,77 @@ sub symblist {
     return 'error';
 }
 
+# --------------------------------------------------------------- Verify a symb
+
+sub symbverify {
+    my ($symb,$thisfn)=@_;
+    $thisfn=&declutter($thisfn);
+# direct jump to resource in page or to a sequence - will construct own symbs
+    if ($thisfn=~/\.(page|sequence)$/) { return 1; }
+# check URL part
+    my ($map,$resid,$url)=split(/\_\_\_/,$symb);
+    unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
+
+    $symb=&symbclean($symb);
+
+    my %bighash;
+    my $okay=0;
+    if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
+                            &GDBM_READER(),0640)) {
+        my $ids=$bighash{'ids_'.&clutter($thisfn)};
+        unless ($ids) { 
+           $ids=$bighash{'ids_/'.$thisfn};
+        }
+        if ($ids) {
+# ------------------------------------------------------------------- Has ID(s)
+	    foreach (split(/\,/,$ids)) {
+               my ($mapid,$resid)=split(/\./,$_);
+               if (
+  &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
+   eq $symb) { 
+                  $okay=1; 
+               }
+	   }
+        }
+	untie(%bighash);
+    }
+    return $okay;
+}
+
+# --------------------------------------------------------------- Clean-up symb
+
+sub symbclean {
+    my $symb=shift;
+
+# remove version from map
+    $symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
+
+# remove version from URL
+    $symb=~s/\.(\d+)\.(\w+)$/\.$2/;
+
+    return $symb;
+}
+
 # ------------------------------------------------------ Return symb list entry
 
 sub symbread {
-    my $thisfn=declutter(shift);
+    my ($thisfn,$donotrecurse)=@_;
+# no filename provided? try from environment
+    unless ($thisfn) {
+        if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
+	$thisfn=$ENV{'request.filename'};
+    }
+# is that filename actually a symb? Verify, clean, and return
+    if ($thisfn=~/\_\_\_\d+\_\_\_(.*)$/) {
+	if (&symbverify($thisfn,$1)) { return &symbclean($thisfn); }
+    }
+    $thisfn=declutter($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)) {
+                      &GDBM_READER(),0640)) {
 	    $syval=$hash{$thisfn};
             untie(%hash);
         }
@@ -1043,6 +3061,7 @@ sub symbread {
         if ($syval) {
            unless ($syval=~/\_\d+$/) {
 	       unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
+                  &appenv('request.ambiguous' => $thisfn);
                   return '';
                }    
                $syval.=$1;
@@ -1050,9 +3069,16 @@ sub symbread {
         } else {
 # ------------------------------------------------------- Was not in symb table
            if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
-                            &GDBM_READER,0640)) {
+                            &GDBM_READER(),0640)) {
 # ---------------------------------------------- Get ID(s) for current resource
-              my $ids=$bighash{'ids_/res/'.$thisfn};
+              my $ids=$bighash{'ids_'.&clutter($thisfn)};
+              unless ($ids) { 
+                 $ids=$bighash{'ids_/'.$thisfn};
+              }
+              unless ($ids) {
+# alias?
+		  $ids=$bighash{'mapalias_'.$thisfn};
+              }
               if ($ids) {
 # ------------------------------------------------------------------- Has ID(s)
                  my @possibilities=split(/\,/,$ids);
@@ -1060,10 +3086,10 @@ sub symbread {
 # ----------------------------------------------- There is only one possibility
 		     my ($mapid,$resid)=split(/\./,$ids);
                      $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
-                 } else {
+                 } elsif (!$donotrecurse) {
 # ------------------------------------------ There is more than one possibility
                      my $realpossible=0;
-                     map {
+                     foreach (@possibilities) {
 			 my $file=$bighash{'src_'.$_};
                          if (&allowed('bre',$file)) {
          		    my ($mapid,$resid)=split(/\./,$_);
@@ -1073,15 +3099,20 @@ sub symbread {
                                        '___'.$resid;
                             }
 			 }
-                     } @possibilities;
+                     }
 		     if ($realpossible!=1) { $syval=''; }
+                 } else {
+                     $syval='';
                  }
 	      }
               untie(%bighash)
            } 
         }
-        if ($syval) { return $syval.'___'.$thisfn; }
+        if ($syval) {
+           return &symbclean($syval.'___'.$thisfn); 
+        }
     }
+    &appenv('request.ambiguous' => $thisfn);
     return '';
 }
 
@@ -1100,49 +3131,108 @@ sub numval {
 }    
 
 sub rndseed {
-    my $symb;
-    unless ($symb=&symbread($ENV{'request.filename'})) { return ''; }
-    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 {
+  my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+  return &ireceipt($name,$domain,$courseid,$symb);
 }
 
 # ------------------------------------------------------------ Serves up a file
 # returns either the contents of the file or a -1
 sub getfile {
-  my $file=shift;
+ my $file=shift;
+ if ($file=~/^\/*uploaded\//) { # user file
+    my $ua=new LWP::UserAgent;
+    my $request=new HTTP::Request('GET',&tokenwrapper($file));
+    my $response=$ua->request($request);
+    if ($response->is_success()) {
+       return $response->content;
+    } else { 
+       return -1; 
+    }
+ } else { # normal file from res space
   &repcopy($file);
   if (! -e $file ) { return -1; };
   my $fh=Apache::File->new($file);
   my $a='';
   while (<$fh>) { $a .=$_; }
-  return $a
+  return $a;
+ }
 }
 
 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/$2:;
+  } elsif ($file=~/^\/*uploaded/) { # is an uploaded file
+    $location=$file;
   } 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 (($file=~/^http:\/\//i) || ($file=~/^\//)) {
+       my $finalpath=filelocation($dir,$file);
+       $finalpath=~s/^\/home\/httpd\/html//;
+       $finalpath=~s-/home/(\w+)/public_html/-/~$1/-;
+       return $finalpath;
+    } else {
+       return $file;
+    }
+}
+
 # ------------------------------------------------------------- Declutters URLs
 
 sub declutter {
@@ -1150,6 +3240,17 @@ sub declutter {
     $thisfn=~s/^$perlvar{'lonDocRoot'}//;
     $thisfn=~s/^\///;
     $thisfn=~s/^res\///;
+    $thisfn=~s/\?.+$//;
+    return $thisfn;
+}
+
+# ------------------------------------------------------------- Clutter up URLs
+
+sub clutter {
+    my $thisfn='/'.&declutter(shift);
+    unless ($thisfn=~/^\/(uploaded|adm|userfiles|ext|raw|priv)\//) { 
+       $thisfn='/res'.$thisfn; 
+    }
     return $thisfn;
 }
 
@@ -1171,14 +3272,31 @@ sub unescape {
 
 # ================================================================ Main Program
 
-sub BEGIN {
-if ($readit ne 'done') {
-# ------------------------------------------------------------ Read access.conf
+sub goodbye {
+   &logthis("Starting Shut down");
+   &flushcourselogs();
+   &logthis("Shutting down");
+}
+
+BEGIN {
+# ----------------------------------- Read loncapa.conf and loncapa_apache.conf
+    unless ($readit) {
+{
+    my $config=Apache::File->new("/etc/httpd/conf/loncapa.conf");
+
+    while (my $configline=<$config>) {
+        if ($configline =~ /^[^\#]*PerlSetVar/) {
+	   my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
+           chomp($varvalue);
+           $perlvar{$varname}=$varvalue;
+        }
+    }
+}
 {
-    my $config=Apache::File->new("/etc/httpd/conf/access.conf");
+    my $config=Apache::File->new("/etc/httpd/conf/loncapa_apache.conf");
 
     while (my $configline=<$config>) {
-        if ($configline =~ /PerlSetVar/) {
+        if ($configline =~ /^[^\#]*PerlSetVar/) {
 	   my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
            chomp($varvalue);
            $perlvar{$varname}=$varvalue;
@@ -1191,10 +3309,19 @@ if ($readit ne 'done') {
     my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
 
     while (my $configline=<$config>) {
-       my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
-       $hostname{$id}=$name;
-       $hostdom{$id}=$domain;
-       if ($role eq 'library') { $libserv{$id}=$name; }
+       chomp($configline);
+       my ($id,$domain,$role,$name,$ip,$domdescr)=split(/:/,$configline);
+       if ($id && $domain && $role && $name && $ip) {
+	 $hostname{$id}=$name;
+	 $hostdom{$id}=$domain;
+	 $hostip{$id}=$ip;
+	 if ($domdescr) { $domaindescription{$domain}=$domdescr; }
+	 if ($role eq 'library') { $libserv{$id}=$name; }
+       } else {
+	 if ($configline) {
+	   &logthis("Skipping hosts.tab line -$configline-");
+	 }
+       }
     }
 }
 
@@ -1204,7 +3331,7 @@ if ($readit ne 'done') {
 
     while (my $configline=<$config>) {
        chomp($configline);
-       if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
+       if ($configline) {
           $spareid{$configline}=1;
        }
     }
@@ -1215,8 +3342,10 @@ if ($readit ne 'done') {
 
     while (my $configline=<$config>) {
        chomp($configline);
+      if ($configline) {
        my ($role,$perm)=split(/ /,$configline);
        if ($perm ne '') { $pr{$role}=$perm; }
+      }
     }
 }
 
@@ -1226,28 +3355,682 @@ if ($readit ne 'done') {
 
     while (my $configline=<$config>) {
        chomp($configline);
+      if ($configline) {
        my ($short,$plain)=split(/:/,$configline);
        if ($plain ne '') { $prp{$short}=$plain; }
+      }
     }
 }
 
-# ------------------------------------------------------------- Read file types
+# ---------------------------------------------------------- Read package table
 {
-    my $config=Apache::File->new("$perlvar{'lonTabDir'}/filetypes.tab");
+    my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
 
     while (my $configline=<$config>) {
        chomp($configline);
-       my ($ending,$emb,@descr)=split(/\s+/,$configline);
-       if ($descr[0] ne '') { 
-         $fe{$ending}=$emb;
-         $fd{$ending}=join(' ',@descr);
+       my ($short,$plain)=split(/:/,$configline);
+       my ($pack,$name)=split(/\&/,$short);
+       if ($plain ne '') {
+          $packagetab{$pack.'&'.$name.'&name'}=$name; 
+          $packagetab{$short}=$plain; 
        }
     }
 }
 
+%metacache=();
 
-$readit='done';
+$processmarker='_'.time.'_'.$perlvar{'lonHostID'};
+$dumpcount=0;
+
+&logtouch();
 &logthis('<font color=yellow>INFO: Read configuration</font>');
+$readit=1;
 }
 }
+
 1;
+__END__
+
+=pod
+
+=head1 NAME
+
+Apache::lonnet - Subroutines to ask questions about things in the network.
+
+=head1 SYNOPSIS
+
+Invoked by other LON-CAPA modules, when they need to talk to or about objects in the network.
+
+ &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
+
+Common parameters:
+
+=over 4
+
+=item *
+
+$uname : an internal username (if $cname expecting a course Id specifically)
+
+=item *
+
+$udom : a domain (if $cdom expecting a course's domain specifically)
+
+=item *
+
+$symb : a resource instance identifier
+
+=item *
+
+$namespace : the name of a .db file that contains the data needed or
+being set.
+
+=back
+
+=head1 INTRODUCTION
+
+This module provides subroutines which interact with the
+lonc/lond (TCP) network layer of LON-CAPA. And Can be used to ask about 
+- classes
+- users 
+- resources
+
+For many of these objects you can also use this to store data about
+them or modify them in various ways.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 RETURN MESSAGES
+
+=over 4
+
+=item *
+
+con_lost : unable to contact remote host
+
+=item *
+
+con_delayed : unable to contact remote host, message will be delivered
+when the connection is brought back up
+
+=item *
+
+con_failed : unable to contact remote host and unable to save message
+for later delivery
+
+=item *
+
+error: : an error a occured, a description of the error follows the :
+
+=item *
+
+no_such_host : unable to fund a host associated with the user/domain
+that was requested
+
+=back
+
+=head1 PUBLIC SUBROUTINES
+
+=head2 Session Environment Functions
+
+=over 4
+
+=item *
+
+appenv(%hash) : the value of %hash is written to the user envirnoment
+file, and will be restored for each access this user makes during this
+session, also modifies the %ENV for the current process
+
+=item *
+
+delenv($regexp) : removes all items from the session environment file that matches the regular expression in $regexp. The values are also delted from the current processes %ENV.
+
+=back
+
+=head2 User Information
+
+=over 4
+
+=item *
+
+queryauthenticate($uname,$udom) : try to determine user's current
+authentication scheme
+
+=item *
+
+authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib
+servers (first use the current one), $upass should be the users password
+
+=item *
+
+homeserver($uname,$udom) : find the server which has the user's
+directory and files (there must be only one), this caches the answer,
+and also caches if there is a borken connection.
+
+=item *
+
+idget($udom,@ids) : find the usernames behind a list of IDs (IDs are a
+unique resource in a domain, there must be only 1 ID per username, and
+only 1 username per ID in a specific domain) (returns hash:
+id=>name,id=>name)
+
+=item *
+
+idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:
+name=>id,name=>id)
+
+=item *
+
+idput($udom,%ids) : store away a list of names and associated IDs
+
+=item *
+
+rolesinit($udom,$username,$authhost) : get user privileges
+
+=item *
+
+usection($udom,$uname,$cname) : finds the section of student in the
+course $cname, return section name/number or '' for "not in course"
+and '-1' for "no section"
+
+=item *
+
+userenvironment($udom,$uname,@what) : gets the values of the keys
+passed in @what from the requested user's environment, returns a hash
+
+=back
+
+=head2 User Roles
+
+=over 4
+
+=item *
+
+allowed($priv,$uri) : check for a user privilege; returns codes for allowed
+actions
+ F: full access
+ U,I,K: authentication modes (cxx only)
+ '': forbidden
+ 1: user needs to choose course
+ 2: browse allowed
+
+=item *
+
+definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
+role rolename set privileges in format of lonTabs/roles.tab for system, domain,
+and course level
+
+=item *
+
+plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
+explanation of a user role term
+
+=back
+
+=head2 User Modification
+
+=over 4
+
+=item *
+
+assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
+user for the level given by URL.  Optional start and end dates (leave empty
+string or zero for "no date")
+
+=item *
+
+changepass($uname,$udom,$currentpass,$newpass,$server) : attempts to
+change a users, password, possible return values are: ok,
+pwchange_failure, non_authorized, auth_mode_error, unknown_user,
+refused
+
+=item *
+
+modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
+
+=item *
+
+modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) : 
+modify user
+
+=item *
+
+modifystudent($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,$end,$start) : modify student
+
+=item *
+
+assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
+custom role; give a custom role to a user for the level given by URL.  Specify
+name and domain of role author, and role name
+
+=item *
+
+revokerole($udom,$uname,$url,$role) : revoke a role for url
+
+=item *
+
+revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
+
+=back
+
+=head2 Course Infomation
+
+=over 4
+
+=item *
+
+coursedescription($courseid) : course description
+
+=item *
+
+courseresdata($coursenum,$coursedomain,@which) : request for current
+parameter setting for a specific course, @what should be a list of
+parameters to ask about. This routine caches answers for 5 minutes.
+
+=back
+
+=head2 Course Modification
+
+=over 4
+
+=item *
+
+writecoursepref($courseid,%prefs) : write preferences (environment
+database) for a course
+
+=item *
+
+createcourse($udom,$description,$url) : make/modify course
+
+=back
+
+=head2 Resource Subroutines
+
+=over 4
+
+=item *
+
+subscribe($fname) : subscribe to a resource, returns URL if possible (probably should use repcopy instead)
+
+=item *
+
+repcopy($filename) : subscribes to the requested file, and attempts to
+replicate from the owning library server, Might return
+HTTP_SERVICE_UNAVAILABLE, HTTP_NOT_FOUND, FORBIDDEN, OK, or
+HTTP_BAD_REQUEST, also attempts to grab the metadata for the
+resource. Expects the local filesystem pathname
+(/home/httpd/html/res/....)
+
+=back
+
+=head2 Resource Information
+
+=over 4
+
+=item *
+
+EXT($varname,$symb,$udom,$uname) : evaluates and returns the value of
+a vairety of different possible values, $varname should be a request
+string, and the other parameters can be used to specify who and what
+one is asking about.
+
+Possible values for $varname are environment.lastname (or other item
+from the envirnment hash), user.name (or someother aspect about the
+user), resource.0.maxtries (or some other part and parameter of a
+resource)
+
+=item *
+
+directcondval($number) : get current value of a condition; reads from a state
+string
+
+=item *
+
+condval($condidx) : value of condition index based on state
+
+=item *
+
+metadata($uri,$what,$liburi,$prefix,$depthcount) : request a
+resource's metadata, $what should be either a specific key, or either
+'keys' (to get a list of possible keys) or 'packages' to get a list of
+packages that this resource currently uses, the last 3 arguments are only used internally for recursive metadata.
+
+this function automatically caches all requests
+
+=item *
+
+metadata_query($query,$custom,$customshow) : make a metadata query against the
+network of library servers; returns file handle of where SQL and regex results
+will be stored for query
+
+=item *
+
+symbread($filename) : return symbolic list entry (filename argument optional);
+returns the data handle
+
+=item *
+
+symbverify($symb,$thisfn) : verifies that $symb actually exists and is
+a possible symb for the URL in $thisfn, returns a 1 on success, 0 on
+failure, user must be in a course, as it assumes the existance of the
+course initi hash, and uses $ENV('request.course.id'}
+
+
+=item *
+
+symbclean($symb) : removes versions numbers from a symb, returns the
+cleaned symb
+
+=item *
+
+is_on_map($uri) : checks if the $uri is somewhere on the current
+course map, user must be in a course for it to work.
+
+=item *
+
+numval($salt) : return random seed value (addend for rndseed)
+
+=item *
+
+rndseed($symb,$courseid,$udom,$uname) : create a random sum; returns
+a random seed, all arguments are optional, if they aren't sent it uses 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 its return value
+
+=item *
+
+ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
+unfakeable, receipt
+
+=item *
+
+receipt() : API to ireceipt working off of ENV values; given out to users
+
+=item *
+
+countacc($url) : count the number of accesses to a given URL
+
+=item *
+
+checkout($symb,$tuname,$tudom,$tcrsid) :  creates a record of a user having looked at an item, most likely printed out or otherwise using a resource
+
+=item *
+
+checkin($token) : updates that a resource has beeen returned (a hard copy version for instance) and returns the data that $token was Checkout with ($symb, $tuname, $tudom, and $tcrsid)
+
+=item *
+
+expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
+
+=item *
+
+devalidate($symb) : devalidate temporary spreadsheet calculations,
+forcing spreadsheet to reevaluate the resource scores next time.
+
+=back
+
+=head2 Storing/Retreiving Data
+
+=over 4
+
+=item *
+
+store($storehash,$symb,$namespace,$udom,$uname) : stores hash permanently
+for this url; hashref needs to be given and should be a \%hashname; the
+remaining args aren't required and if they aren't passed or are '' they will
+be derived from the ENV
+
+=item *
+
+cstore($storehash,$symb,$namespace,$udom,$uname) : same as store but
+uses critical subroutine
+
+=item *
+
+restore($symb,$namespace,$udom,$uname) : returns hash for this symb;
+all args are optional
+
+=item *
+
+tmpstore($storehash,$symb,$namespace,$udom,$uname) : storage that
+works very similar to store/cstore, but all data is stored in a
+temporary location and can be reset using tmpreset, $storehash should
+be a hash reference, returns nothing on success
+
+=item *
+
+tmprestore($symb,$namespace,$udom,$uname) : storage that works very
+similar to restore, but all data is stored in a temporary location and
+can be reset using tmpreset. Returns a hash of values on success,
+error string otherwise.
+
+=item *
+
+tmpreset($symb,$namespace,$udom,$uname) : temporary storage reset,
+deltes all keys for $symb form the temporary storage hash.
+
+=item *
+
+get($namespace,$storearr,$udom,$uname) : returns hash with keys from array
+reference filled in from namesp ($udom and $uname are optional)
+
+=item *
+
+del($namespace,$storearr,$udom,$uname) : deletes keys out of array from
+namesp ($udom and $uname are optional)
+
+=item *
+
+dump($namespace,$udom,$uname,$regexp) : 
+dumps the complete (or key matching regexp) namespace into a hash
+($udom, $uname and $regexp are optional)
+
+=item *
+
+put($namespace,$storehash,$udom,$uname) : stores hash in namesp
+($udom and $uname are optional)
+
+=item *
+
+cput($namespace,$storehash,$udom,$uname) : critical put
+($udom and $uname are optional)
+
+=item *
+
+eget($namespace,$storearr,$udom,$uname) : returns hash with keys from array
+reference filled in from namesp (encrypts the return communication)
+($udom and $uname are optional)
+
+=item *
+
+log($udom,$name,$home,$message) : write to permanent log for user; use
+critical subroutine
+
+=back
+
+=head2 Network Status Functions
+
+=over 4
+
+=item *
+
+dirlist($uri) : return directory list based on URI
+
+=item *
+
+spareserver() : find server with least workload from spare.tab
+
+=back
+
+=head2 Apache Request
+
+=over 4
+
+=item *
+
+ssi($url,%hash) : server side include, does a complete request cycle on url to
+localhost, posts hash
+
+=back
+
+=head2 Data to String to Data
+
+=over 4
+
+=item *
+
+hash2str(%hash) : convert a hash into a string complete with escaping and '='
+and '&' separators, supports elements that are arrayrefs and hashrefs
+
+=item *
+
+hashref2str($hashref) : convert a hashref into a string complete with
+escaping and '=' and '&' separators, supports elements that are
+arrayrefs and hashrefs
+
+=item *
+
+arrayref2str($arrayref) : convert an arrayref into a string complete
+with escaping and '&' separators, supports elements that are arrayrefs
+and hashrefs
+
+=item *
+
+str2hash($string) : convert string to hash using unescaping and
+splitting on '=' and '&', supports elements that are arrayrefs and
+hashrefs
+
+=item *
+
+str2array($string) : convert string to hash using unescaping and
+splitting on '&', supports elements that are arrayrefs and hashrefs
+
+=back
+
+=head2 Logging Routines
+
+=over 4
+
+These routines allow one to make log messages in the lonnet.log and
+lonnet.perm logfiles.
+
+=item *
+
+logtouch() : make sure the logfile, lonnet.log, exists
+
+=item *
+
+logthis() : append message to the normal lonnet.log file, it gets
+preiodically rolled over and deleted.
+
+=item *
+
+logperm() : append a permanent message to lonnet.perm.log, this log
+file never gets deleted by any automated portion of the system, only
+messages of critical importance should go in here.
+
+=back
+
+=head2 General File Helper Routines
+
+=over 4
+
+=item *
+
+getfile($file) : returns the entire contents of a file or -1; it
+properly subscribes to and replicates the file if neccessary.
+
+=item *
+
+filelocation($dir,$file) : returns file system location of a file
+based on URI; meant to be "fairly clean" absolute reference, $dir is a
+directory that relative $file lookups are to looked in ($dir of /a/dir
+and a file of ../bob will become /a/bob)
+
+=item *
+
+hreflocation($dir,$file) : returns file system location or a URL; same as
+filelocation except for hrefs
+
+=item *
+
+declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
+
+=back
+
+=head2 HTTP Helper Routines
+
+=over 4
+
+=item *
+
+escape() : unpack non-word characters into CGI-compatible hex codes
+
+=item *
+
+unescape() : pack CGI-compatible hex codes into actual non-word ASCII character
+
+=back
+
+=head1 PRIVATE SUBROUTINES
+
+=head2 Underlying communication routines (Shouldn't call)
+
+=over 4
+
+=item *
+
+subreply() : tries to pass a message to lonc, returns con_lost if incapable
+
+=item *
+
+reply() : uses subreply to send a message to remote machine, logs all failures
+
+=item *
+
+critical() : passes a critical message to another server; if cannot
+get through then place message in connection buffer directory and
+returns con_delayed, if incapable of saving message, returns
+con_failed
+
+=item *
+
+reconlonc() : tries to reconnect lonc client processes.
+
+=back
+
+=head2 Resource Access Logging
+
+=over 4
+
+=item *
+
+flushcourselogs() : flush (save) buffer logs and access logs
+
+=item *
+
+courselog($what) : save message for course in hash
+
+=item *
+
+courseacclog($what) : save message for course using &courselog().  Perform
+special processing for specific resource types (problems, exams, quizzes, etc).
+
+=item *
+
+goodbye() : flush course logs and log shutting down; it is called in srm.conf
+as a PerlChildExitHandler
+
+=back
+
+=head2 Other
+
+=over 4
+
+=item *
+
+symblist($mapname,%newhash) : update symbolic storage links
+
+=back
+
+=cut