loncom/lonnet/perl/lonnet.pm - diff

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Diff for /loncom/lonnet/perl/lonnet.pm between versions 1.243 and 1.648

-version 1.243, 2002/06/24 19:41:41
+version 1.648, 2005/07/26 13:30:34
  Line 25
  #
  # 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,
- # 11/8,11/16,11/18,11/22,11/23,12/22,
- # 01/06,01/13,02/24,02/28,02/29,
- # 03/01,03/02,03/06,03/07,03/13,
- # 04/05,05/29,05/31,06/01,
- # 06/05,06/26 Gerd Kortemeyer
- # 06/26 Ben Tyszka
- # 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
- # 08/14 Ben Tyszka
- # 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
- # 10/04 Gerd Kortemeyer
- # 10/04 Guy Albertelli
- # 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29,
- # 10/30,10/31,
- # 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
- # 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
- # 05/01/01 Guy Albertelli
- # 05/01,06/01,09/01 Gerd Kortemeyer
- # 09/01 Guy Albertelli
- # 09/01,10/01,11/01 Gerd Kortemeyer
- # YEAR=2001
- # 02/27/01 Scott Harrison
- # 3/2 Gerd Kortemeyer
- # 3/15,3/19 Scott Harrison
- # 3/19,3/20 Gerd Kortemeyer
- # 3/22,3/27,4/2,4/16,4/17 Scott Harrison
- # 5/26,5/28 Gerd Kortemeyer
- # 5/30 H. K. Ng
- # 6/1 Gerd Kortemeyer
- # July Guy Albertelli
- # 8/4,8/7,8/8,8/9,8/11,8/16,8/17,8/18,8/20,8/23,9/20,9/21,9/26,
- # 10/2 Gerd Kortemeyer
- # 10/5,10/10,11/13,11/15 Scott Harrison
- # 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;
  use strict;
- use Apache::File;
  use LWP::UserAgent();
  use HTTP::Headers;
+ use HTTP::Date;
+ # use Date::Parse;
  use vars
- qw(%perlvar %hostname %homecache %badServerCache %hostip %spareid %hostdom
+ qw(%perlvar %hostname %badServerCache %iphost %spareid %hostdom
-    %libserv %pr %prp %metacache %packagetab
+    %libserv %pr %prp $memcache %packagetab
-    %courselogs %accesshash $processmarker $dumpcount
+    %courselogs %accesshash %userrolehash $processmarker $dumpcount
-    %coursedombuf %coursehombuf %courseresdatacache);
+    %coursedombuf %coursenumbuf %coursehombuf %coursedescrbuf %courseinstcodebuf %courseownerbuf
+    %domaindescription %domain_auth_def %domain_auth_arg_def
+    %domain_lang_def %domain_city %domain_longi %domain_lati $tmpdir $_64bit
+    %env);
  use IO::Socket;
  use GDBM_File;
  use Apache::Constants qw(:common :http);
  use HTML::LCParser;
+ use HTML::Parser;
  use Fcntl qw(:flock);
+ use Apache::lonlocal;
+ use Storable qw(lock_store lock_nstore lock_retrieve freeze thaw nfreeze);
+ use Time::HiRes qw( gettimeofday tv_interval );
+ use Cache::Memcached;
  my $readit;
+ my $max_connection_retries = 10;     # Or some such value.
+ require Exporter;
+ our @ISA = qw (Exporter);
+ our @EXPORT = qw(%env);
+ =pod
+ =head1 Package Variables
+ These are largely undocumented, so if you decipher one please note it here.
+ =over 4
+ =item $processmarker
+ Contains the time this process was started and this servers host id.
+ =item $dumpcount
+ Counts the number of times a message log flush has been attempted (regardless
+ of success) by this process.  Used as part of the filename when messages are
+ delayed.
+ =back
+ =cut
  # --------------------------------------------------------------------- Logging
  sub logtouch {
      my $execdir=$perlvar{'lonDaemons'};
      unless (-e "$execdir/logs/lonnet.log") {
- 	my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
+ 	open(my $fh,">>$execdir/logs/lonnet.log");
  	close $fh;
      }
      my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
- Line 105  sub logthis {
+ Line 101  sub logthis {
      my $execdir=$perlvar{'lonDaemons'};
      my $now=time;
      my $local=localtime($now);
-     my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
+     if (open(my $fh,">>$execdir/logs/lonnet.log")) {
-     print $fh "$local ($$): $message\n";
+ 	print $fh "$local ($$): $message\n";
+ 	close($fh);
+     }
      return 1;
  }
- Line 115  sub logperm {
+ Line 113  sub logperm {
      my $execdir=$perlvar{'lonDaemons'};
      my $now=time;
      my $local=localtime($now);
-     my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
+     if (open(my $fh,">>$execdir/logs/lonnet.perm.log")) {
-     print $fh "$now:$message:$local\n";
+ 	print $fh "$now:$message:$local\n";
+ 	close($fh);
+     }
      return 1;
  }
  Line 124  sub logperm {
  sub subreply {
      my ($cmd,$server)=@_;
      my $peerfile="$perlvar{'lonSockDir'}/$server";
-     my $client=IO::Socket::UNIX->new(Peer    =>"$peerfile",
+     #
-                                      Type    => SOCK_STREAM,
+     #  With loncnew process trimming, there's a timing hole between lonc server
-                                      Timeout => 10)
+     #  process exit and the master server picking up the listen on the AF_UNIX
-        or return "con_lost";
+     #  socket.  In that time interval, a lock file will exist:
-     print $client "$cmd\n";
-     my $answer=<$client>;
+     my $lockfile=$peerfile.".lock";
-     if (!$answer) { $answer="con_lost"; }
+     while (-e $lockfile) {	# Need to wait for the lockfile to disappear.
-     chomp($answer);
+ 	sleep(1);
+     }
+     # At this point, either a loncnew parent is listening or an old lonc
+     # or loncnew child is listening so we can connect or everything's dead.
+     #
+     #   We'll give the connection a few tries before abandoning it.  If
+     #   connection is not possible, we'll con_lost back to the client.
+     #
+     my $client;
+     for (my $retries = 0; $retries < $max_connection_retries; $retries++) {
+ 	$client=IO::Socket::UNIX->new(Peer    =>"$peerfile",
+ 				      Type    => SOCK_STREAM,
+ 				      Timeout => 10);
+ 	if($client) {
+ 	    last;		# Connected!
+ 	}
+ 	sleep(1);		# Try again later if failed connection.
+     }
+     my $answer;
+     if ($client) {
+ 	print $client "$cmd\n";
+ 	$answer=<$client>;
+ 	if (!$answer) { $answer="con_lost"; }
+ 	chomp($answer);
+     } else {
+ 	$answer = 'con_lost';	# Failed connection.
+     }
      return $answer;
  }
- Line 139  sub reply {
+ Line 165  sub reply {
      my ($cmd,$server)=@_;
      unless (defined($hostname{$server})) { return 'no_such_host'; }
      my $answer=subreply($cmd,$server);
-     if ($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>");
- Line 168  sub reconlonc {
+ Line 178  sub reconlonc {
      my $peerfile=shift;
      &logthis("Trying to reconnect for $peerfile");
      my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
-     if (my $fh=Apache::File->new("$loncfile")) {
+     if (open(my $fh,"<$loncfile")) {
  	my $loncpid=<$fh>;
          chomp($loncpid);
          if (kill 0 => $loncpid) {
- Line 202  sub critical {
+ Line 212  sub critical {
      }
      my $answer=reply($cmd,$server);
      if ($answer eq 'con_lost') {
-         my $pingreply=reply('ping',$server);
  	&reconlonc("$perlvar{'lonSockDir'}/$server");
-         my $pongreply=reply('pong',$server);
+ 	my $answer=reply($cmd,$server);
-         &logthis("Ping/Pong for $server: $pingreply/$pongreply");
-         $answer=reply($cmd,$server);
          if ($answer eq 'con_lost') {
              my $now=time;
              my $middlename=$cmd;
              $middlename=substr($middlename,0,16);
              $middlename=~s/\W//g;
              my $dfilename=
-              "$perlvar{'lonSockDir'}/delayed/$now.$middlename.$server";
+       "$perlvar{'lonSockDir'}/delayed/$now.$dumpcount.$$.$middlename.$server";
+             $dumpcount++;
              {
-              my $dfh;
+ 		my $dfh;
-              if ($dfh=Apache::File->new(">$dfilename")) {
+ 		if (open($dfh,">$dfilename")) {
-                 print $dfh "$cmd\n";
+ 		    print $dfh "$cmd\n";
- 	     }
+ 		    close($dfh);
+ 		}
              }
              sleep 2;
              my $wcmd='';
              {
- 	     my $dfh;
+ 		my $dfh;
-              if ($dfh=Apache::File->new("$dfilename")) {
+ 		if (open($dfh,"<$dfilename")) {
-                 $wcmd=<$dfh>;
+ 		    $wcmd=<$dfh>;
- 	     }
+ 		    close($dfh);
+ 		}
              }
              chomp($wcmd);
              if ($wcmd eq $cmd) {
- Line 245  sub critical {
+ Line 255  sub critical {
      return $answer;
  }
+ # ------------------------------------------- Transfer profile into environment
+ sub transfer_profile_to_env {
+     my ($lonidsdir,$handle)=@_;
+     my @profile;
+     {
+ 	open(my $idf,"$lonidsdir/$handle.id");
+ 	flock($idf,LOCK_SH);
+ 	@profile=<$idf>;
+ 	close($idf);
+     }
+     my $envi;
+     my %Remove;
+     for ($envi=0;$envi<=$#profile;$envi++) {
+ 	chomp($profile[$envi]);
+ 	my ($envname,$envvalue)=split(/=/,$profile[$envi]);
+ 	$env{$envname} = $envvalue;
+         if (my ($key,$time) = ($envname =~ /^(cgi\.(\d+)_\d+\.)/)) {
+             if ($time < time-300) {
+                 $Remove{$key}++;
+             }
+         }
+     }
+     $env{'user.environment'} = "$lonidsdir/$handle.id";
+     foreach my $expired_key (keys(%Remove)) {
+         &delenv($expired_key);
+     }
+ }
  # ---------------------------------------------------------- Append Environment
  sub appenv {
- Line 256  sub appenv {
+ Line 295  sub appenv {
                  .'</font>');
  	    delete($newenv{$_});
          } else {
-             $ENV{$_}=$newenv{$_};
+             $env{$_}=$newenv{$_};
          }
      }
      my $lockfh;
-     unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {
+     unless (open($lockfh,"$env{'user.environment'}")) {
-        return 'error: '.$!;
+ 	return 'error: '.$!;
      }
      unless (flock($lockfh,LOCK_EX)) {
           &logthis("<font color=blue>WARNING: ".
                    'Could not obtain exclusive lock in appenv: '.$!);
-          $lockfh->close();
+          close($lockfh);
           return 'error: '.$!;
      }
      my @oldenv;
      {
-      my $fh;
+ 	my $fh;
-      unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
+ 	unless (open($fh,"$env{'user.environment'}")) {
- 	return 'error: '.$!;
+ 	    return 'error: '.$!;
-      }
+ 	}
-      @oldenv=<$fh>;
+ 	@oldenv=<$fh>;
-      $fh->close();
+ 	close($fh);
      }
      for (my $i=0; $i<=$#oldenv; $i++) {
          chomp($oldenv[$i]);
          if ($oldenv[$i] ne '') {
-            my ($name,$value)=split(/=/,$oldenv[$i]);
+ 	    my ($name,$value)=split(/=/,$oldenv[$i]);
-            unless (defined($newenv{$name})) {
+ 	    unless (defined($newenv{$name})) {
- 	      $newenv{$name}=$value;
+ 		$newenv{$name}=$value;
- 	   }
+ 	    }
          }
      }
      {
-      my $fh;
+ 	my $fh;
-      unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
+ 	unless (open($fh,">$env{'user.environment'}")) {
- 	return 'error';
+ 	    return 'error';
-      }
+ 	}
-      my $newname;
+ 	my $newname;
-      foreach $newname (keys %newenv) {
+ 	foreach $newname (keys %newenv) {
- 	 print $fh "$newname=$newenv{$newname}\n";
+ 	    print $fh "$newname=$newenv{$newname}\n";
-      }
+ 	}
-      $fh->close();
+ 	close($fh);
      }
-     $lockfh->close();
+     close($lockfh);
      return 'ok';
  }
  # ----------------------------------------------------- Delete from Environment
- Line 316  sub delenv {
+ Line 355  sub delenv {
      }
      my @oldenv;
      {
-      my $fh;
+ 	my $fh;
-      unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
+ 	unless (open($fh,"$env{'user.environment'}")) {
- 	return 'error';
+ 	    return 'error';
-      }
+ 	}
-      unless (flock($fh,LOCK_SH)) {
+ 	unless (flock($fh,LOCK_SH)) {
-          &logthis("<font color=blue>WARNING: ".
+ 	    &logthis("<font color=blue>WARNING: ".
-                   'Could not obtain shared lock in delenv: '.$!);
+ 		     'Could not obtain shared lock in delenv: '.$!);
-          $fh->close();
+ 	    close($fh);
-          return 'error: '.$!;
+ 	    return 'error: '.$!;
-      }
+ 	}
-      @oldenv=<$fh>;
+ 	@oldenv=<$fh>;
-      $fh->close();
+ 	close($fh);
      }
      {
-      my $fh;
+ 	my $fh;
-      unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
+ 	unless (open($fh,">$env{'user.environment'}")) {
- 	return 'error';
+ 	    return 'error';
-      }
+ 	}
-      unless (flock($fh,LOCK_EX)) {
+ 	unless (flock($fh,LOCK_EX)) {
-          &logthis("<font color=blue>WARNING: ".
+ 	    &logthis("<font color=blue>WARNING: ".
-                   'Could not obtain exclusive lock in delenv: '.$!);
+ 		     'Could not obtain exclusive lock in delenv: '.$!);
-          $fh->close();
+ 	    close($fh);
-          return 'error: '.$!;
+ 	    return 'error: '.$!;
-      }
+ 	}
-      foreach (@oldenv) {
+ 	foreach (@oldenv) {
- 	 unless ($_=~/^$delthis/) { print $fh $_; }
+ 	    if ($_=~/^$delthis/) {
-      }
+                 my ($key,undef) = split('=',$_);
-      $fh->close();
+                 delete($env{$key});
+             } else {
+                 print $fh $_;
+             }
+ 	}
+ 	close($fh);
      }
      return 'ok';
  }
+ # ------------------------------------------ Find out current server userload
+ # there is a copy in lond
+ sub userload {
+     my $numusers=0;
+     {
+ 	opendir(LONIDS,$perlvar{'lonIDsDir'});
+ 	my $filename;
+ 	my $curtime=time;
+ 	while ($filename=readdir(LONIDS)) {
+ 	    if ($filename eq '.' || $filename eq '..') {next;}
+ 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
+ 	    if ($curtime-$mtime < 1800) { $numusers++; }
+ 	}
+ 	closedir(LONIDS);
+     }
+     my $userloadpercent=0;
+     my $maxuserload=$perlvar{'lonUserLoadLim'};
+     if ($maxuserload) {
+ 	$userloadpercent=100*$numusers/$maxuserload;
+     }
+     $userloadpercent=sprintf("%.2f",$userloadpercent);
+     return $userloadpercent;
+ }
+ # ------------------------------------------ Fight off request when overloaded
+ sub overloaderror {
+     my ($r,$checkserver)=@_;
+     unless ($checkserver) { $checkserver=$perlvar{'lonHostID'}; }
+     my $loadavg;
+     if ($checkserver eq $perlvar{'lonHostID'}) {
+        open(my $loadfile,'/proc/loadavg');
+        $loadavg=<$loadfile>;
+        $loadavg =~ s/\s.*//g;
+        $loadavg = 100*$loadavg/$perlvar{'lonLoadLim'};
+        close($loadfile);
+     } 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,$userloadpercent) = @_;
      my $tryserver;
      my $spareserver='';
-     my $lowestserver=100;
+     if ($userloadpercent !~ /\d/) { $userloadpercent=0; }
+     my $lowestserver=$loadpercent > $userloadpercent?
+ 	             $loadpercent :  $userloadpercent;
      foreach $tryserver (keys %spareid) {
-        my $answer=reply('load',$tryserver);
+ 	my $loadans=reply('load',$tryserver);
-        if (($answer =~ /\d/) && ($answer<$lowestserver)) {
+ 	my $userloadans=reply('userload',$tryserver);
- 	   $spareserver="http://$hostname{$tryserver}";
+ 	if ($loadans !~ /\d/ && $userloadans !~ /\d/) {
-            $lowestserver=$answer;
+ 	    next; #didn't get a number from the server
-        }
+ 	}
-     }
+ 	my $answer;
+ 	if ($loadans =~ /\d/) {
+ 	    if ($userloadans =~ /\d/) {
+ 		#both are numbers, pick the bigger one
+ 		$answer=$loadans > $userloadans?
+ 		    $loadans :  $userloadans;
+ 	    } else {
+ 		$answer = $loadans;
+ 	    }
+ 	} else {
+ 	    $answer = $userloadans;
+ 	}
+ 	if (($answer =~ /\d/) && ($answer<$lowestserver)) {
+ 	    $spareserver="http://$hostname{$tryserver}";
+ 	    $lowestserver=$answer;
+ 	}
+     }
      return $spareserver;
  }
- Line 403  sub changepass {
+ Line 514  sub changepass {
  sub queryauthenticate {
      my ($uname,$udom)=@_;
-     if (($perlvar{'lonRole'} eq 'library') &&
+     my $uhome=&homeserver($uname,$udom);
-         ($udom eq $perlvar{'lonDefDomain'})) {
+     if (!$uhome) {
- 	my $answer=reply("encrypt:currentauth:$udom:$uname",
+ 	&logthis("User $uname at $udom is unknown when looking for authentication mechanism");
- 			 $perlvar{'lonHostID'});
+ 	return 'no_host';
- 	unless ($answer eq 'unknown_user' or $answer eq 'refused') {
+     }
- 	    if (length($answer)) {
+     my $answer=reply("encrypt:currentauth:$udom:$uname",$uhome);
- 		return $answer;
+     if ($answer =~ /^(unknown_user|refused|con_lost)/) {
- 	    }
+ 	&logthis("User $uname at $udom threw error $answer when checking authentication mechanism");
- 	    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 $answer;
-     return 'no_host';
  }
  # --------- Try to authenticate user from domain's lib servers (first this one)
- Line 443  sub authenticate {
+ Line 532  sub authenticate {
      my ($uname,$upass,$udom)=@_;
      $upass=escape($upass);
      $uname=~s/\W//g;
-     if (($perlvar{'lonRole'} eq 'library') &&
+     my $uhome=&homeserver($uname,$udom);
-         ($udom eq $perlvar{'lonDefDomain'})) {
+     if (!$uhome) {
-     my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
+ 	&logthis("User $uname at $udom is unknown in authenticate");
-         if ($answer =~ /authorized/) {
+ 	return 'no_host';
-               if ($answer eq 'authorized') {
+     }
-                  &logthis("User $uname at $udom authorized by local server");
+     my $answer=reply("encrypt:auth:$udom:$uname:$upass",$uhome);
-                  return $perlvar{'lonHostID'};
+     if ($answer eq 'authorized') {
-               }
+ 	&logthis("User $uname at $udom authorized by $uhome");
-               if ($answer eq 'non_authorized') {
+ 	return $uhome;
-                  &logthis("User $uname at $udom rejected by local server");
+     }
-                  return 'no_host';
+     if ($answer eq 'non_authorized') {
-               }
+ 	&logthis("User $uname at $udom rejected by $uhome");
- 	}
+ 	return 'no_host';
-     }
-     my $tryserver;
-     foreach $tryserver (keys %libserv) {
- 	if ($hostdom{$tryserver} eq $udom) {
-            my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
-            if ($answer =~ /authorized/) {
-               if ($answer eq 'authorized') {
-                  &logthis("User $uname at $udom authorized by $tryserver");
-                  return $tryserver;
-               }
-               if ($answer eq 'non_authorized') {
-                  &logthis("User $uname at $udom rejected by $tryserver");
-                  return 'no_host';
-               }
- 	   }
-        }
      }
-     &logthis("User $uname at $udom could not be authenticated");
+     &logthis("User $uname at $udom threw error $answer when checking authentication mechanism");
      return 'no_host';
  }
  # ---------------------- Find the homebase for a user from domain's lib servers
+ my %homecache;
  sub homeserver {
      my ($uname,$udom,$ignoreBadCache)=@_;
      my $index="$uname:$udom";
-     if ($homecache{$index}) {
-         return "$homecache{$index}";
+     if (exists($homecache{$index})) { return $homecache{$index}; }
-     }
      my $tryserver;
      foreach $tryserver (keys %libserv) {
          next if ($ignoreBadCache ne 'true' &&
- Line 493  sub homeserver {
+ Line 565  sub homeserver {
  	if ($hostdom{$tryserver} eq $udom) {
             my $answer=reply("home:$udom:$uname",$tryserver);
             if ($answer eq 'found') {
-               $homecache{$index}=$tryserver;
+ 	       return $homecache{$index}=$tryserver;
-               return $tryserver;
             } elsif ($answer eq 'no_host') {
  	       $badServerCache{$tryserver}=1;
             }
- Line 547  sub idput {
+ Line 618  sub idput {
      my ($udom,%ids)=@_;
      my %servers=();
      foreach (keys %ids) {
+ 	&cput('environment',{'id'=>$ids{$_}},$udom,$_);
          my $uhom=&homeserver($_,$udom);
          if ($uhom ne 'no_host') {
              my $id=&escape($ids{$_});
- Line 557  sub idput {
+ Line 629  sub idput {
              } else {
                  $servers{$uhom}=$id.'='.$unam;
              }
-             &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
          }
      }
      foreach (keys %servers) {
- Line 565  sub idput {
+ Line 636  sub idput {
      }
  }
+ # --------------------------------------------------- Assign a key to a student
+ sub assign_access_key {
+ #
+ # a valid key looks like uname:udom#comments
+ # comments are being appended
+ #
+     my ($ckey,$kdom,$knum,$cdom,$cnum,$udom,$uname,$logentry)=@_;
+     $kdom=
+    $env{'course.'.$env{'request.course.id'}.'.domain'} unless (defined($kdom));
+     $knum=
+    $env{'course.'.$env{'request.course.id'}.'.num'} unless (defined($knum));
+     $cdom=
+    $env{'course.'.$env{'request.course.id'}.'.domain'} unless (defined($cdom));
+     $cnum=
+    $env{'course.'.$env{'request.course.id'}.'.num'} unless (defined($cnum));
+     $udom=$env{'user.name'} unless (defined($udom));
+     $uname=$env{'user.domain'} unless (defined($uname));
+     my %existing=&get('accesskeys',[$ckey],$kdom,$knum);
+     if (($existing{$ckey}=~/^\#(.*)$/) || # - new key
+         ($existing{$ckey}=~/^\Q$uname\E\:\Q$udom\E\#(.*)$/)) {
+                                                   # assigned to this person
+                                                   # - this should not happen,
+                                                   # unless something went wrong
+                                                   # the first time around
+ # ready to assign
+         $logentry=$1.'; '.$logentry;
+         if (&put('accesskeys',{$ckey=>$uname.':'.$udom.'#'.$logentry},
+                                                  $kdom,$knum) eq 'ok') {
+ # key now belongs to user
+ 	    my $envkey='key.'.$cdom.'_'.$cnum;
+             if (&put('environment',{$envkey => $ckey}) eq 'ok') {
+                 &appenv('environment.'.$envkey => $ckey);
+                 return 'ok';
+             } else {
+                 return
+   'error: Count not permanently assign key, will need to be re-entered later.';
+ 	    }
+         } else {
+             return 'error: Could not assign key, try again later.';
+         }
+     } elsif (!$existing{$ckey}) {
+ # the key does not exist
+ 	return 'error: The key does not exist';
+     } else {
+ # the key is somebody else's
+ 	return 'error: The key is already in use';
+     }
+ }
+ # ------------------------------------------ put an additional comment on a key
+ sub comment_access_key {
+ #
+ # a valid key looks like uname:udom#comments
+ # comments are being appended
+ #
+     my ($ckey,$cdom,$cnum,$logentry)=@_;
+     $cdom=
+    $env{'course.'.$env{'request.course.id'}.'.domain'} unless (defined($cdom));
+     $cnum=
+    $env{'course.'.$env{'request.course.id'}.'.num'} unless (defined($cnum));
+     my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
+     if ($existing{$ckey}) {
+         $existing{$ckey}.='; '.$logentry;
+ # ready to assign
+         if (&put('accesskeys',{$ckey=>$existing{$ckey}},
+                                                  $cdom,$cnum) eq 'ok') {
+ 	    return 'ok';
+         } else {
+ 	    return 'error: Count not store comment.';
+         }
+     } else {
+ # the key does not exist
+ 	return 'error: The key does not exist';
+     }
+ }
+ # ------------------------------------------------------ Generate a set of keys
+ sub generate_access_keys {
+     my ($number,$cdom,$cnum,$logentry)=@_;
+     $cdom=
+    $env{'course.'.$env{'request.course.id'}.'.domain'} unless (defined($cdom));
+     $cnum=
+    $env{'course.'.$env{'request.course.id'}.'.num'} unless (defined($cnum));
+     unless (&allowed('mky',$cdom)) { return 0; }
+     unless (($cdom) && ($cnum)) { return 0; }
+     if ($number>10000) { return 0; }
+     sleep(2); # make sure don't get same seed twice
+     srand(time()^($$+($$<<15))); # from "Programming Perl"
+     my $total=0;
+     for (my $i=1;$i<=$number;$i++) {
+        my $newkey=sprintf("%lx",int(100000*rand)).'-'.
+                   sprintf("%lx",int(100000*rand)).'-'.
+                   sprintf("%lx",int(100000*rand));
+        $newkey=~s/1/g/g; # folks mix up 1 and l
+        $newkey=~s/0/h/g; # and also 0 and O
+        my %existing=&get('accesskeys',[$newkey],$cdom,$cnum);
+        if ($existing{$newkey}) {
+            $i--;
+        } else {
+ 	  if (&put('accesskeys',
+               { $newkey => '# generated '.localtime().
+                            ' by '.$env{'user.name'}.'@'.$env{'user.domain'}.
+                            '; '.$logentry },
+ 		   $cdom,$cnum) eq 'ok') {
+               $total++;
+ 	  }
+        }
+     }
+     &log($env{'user.domain'},$env{'user.name'},$env{'user.home'},
+          'Generated '.$total.' keys for '.$cnum.' at '.$cdom);
+     return $total;
+ }
+ # ------------------------------------------------------- Validate an accesskey
+ sub validate_access_key {
+     my ($ckey,$cdom,$cnum,$udom,$uname)=@_;
+     $cdom=
+    $env{'course.'.$env{'request.course.id'}.'.domain'} unless (defined($cdom));
+     $cnum=
+    $env{'course.'.$env{'request.course.id'}.'.num'} unless (defined($cnum));
+     $udom=$env{'user.domain'} unless (defined($udom));
+     $uname=$env{'user.name'} unless (defined($uname));
+     my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
+     return ($existing{$ckey}=~/^\Q$uname\E\:\Q$udom\E\#/);
+ }
  # ------------------------------------- Find the section of student in a course
- sub usection {
+ sub getsection {
      my ($udom,$unam,$courseid)=@_;
+     my $cachetime=1800;
      $courseid=~s/\_/\//g;
      $courseid=~s/^(\w)/\/$1/;
+     my $hashid="$udom:$unam:$courseid";
+     my ($result,$cached)=&is_cached_new('getsection',$hashid);
+     if (defined($cached)) { return $result; }
+     my %Pending;
+     my %Expired;
+     #
+     # Each role can either have not started yet (pending), be active,
+     #    or have expired.
+     #
+     # If there is an active role, we are done.
+     #
+     # If there is more than one role which has not started yet,
+     #     choose the one which will start sooner
+     # If there is one role which has not started yet, return it.
+     #
+     # If there is more than one expired role, choose the one which ended last.
+     # If there is a role which has expired, return it.
+     #
      foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
                          &homeserver($unam,$udom)))) {
          my ($key,$value)=split(/\=/,$_);
          $key=&unescape($key);
-         if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
+         next if ($key !~/^\Q$courseid\E(?:\/)*(\w+)*\_st$/);
-             my $section=$1;
+         my $section=$1;
-             if ($key eq $courseid.'_st') { $section=''; }
+         if ($key eq $courseid.'_st') { $section=''; }
- 	    my ($dummy,$end,$start)=split(/\_/,&unescape($value));
+         my ($dummy,$end,$start)=split(/\_/,&unescape($value));
-             my $now=time;
+         my $now=time;
-             my $notactive=0;
+         if (defined($end) && $end && ($now > $end)) {
-             if ($start) {
+             $Expired{$end}=$section;
- 		if ($now<$start) { $notactive=1; }
+             next;
-             }
+         }
-             if ($end) {
+         if (defined($start) && $start && ($now < $start)) {
-                 if ($now>$end) { $notactive=1; }
+             $Pending{$start}=$section;
-             }
+             next;
-             unless ($notactive) { return $section; }
          }
+         return &do_cache_new('getsection',$hashid,$section,$cachetime);
      }
-     return '-1';
+     #
+     # Presumedly there will be few matching roles from the above
+     # loop and the sorting time will be negligible.
+     if (scalar(keys(%Pending))) {
+         my ($time) = sort {$a <=> $b} keys(%Pending);
+         return &do_cache_new('getsection',$hashid,$Pending{$time},$cachetime);
+     }
+     if (scalar(keys(%Expired))) {
+         my @sorted = sort {$a <=> $b} keys(%Expired);
+         my $time = pop(@sorted);
+         return &do_cache_new('getsection',$hashid,$Expired{$time},$cachetime);
+     }
+     return &do_cache_new('getsection',$hashid,'-1',$cachetime);
+ }
+ sub save_cache {
+     my ($r)=@_;
+     if (! $r->is_initial_req()) { return DECLINED; }
+     &purge_remembered();
+     undef(%env);
+     return OK;
+ }
+ my $to_remember=-1;
+ my %remembered;
+ my %accessed;
+ my $kicks=0;
+ my $hits=0;
+ sub devalidate_cache_new {
+     my ($name,$id,$debug) = @_;
+     if ($debug) { &Apache::lonnet::logthis("deleting $name:$id"); }
+     $id=&escape($name.':'.$id);
+     $memcache->delete($id);
+     delete($remembered{$id});
+     delete($accessed{$id});
+ }
+ sub is_cached_new {
+     my ($name,$id,$debug) = @_;
+     $id=&escape($name.':'.$id);
+     if (exists($remembered{$id})) {
+ 	if ($debug) { &Apache::lonnet::logthis("Earyl return $id of $remembered{$id} "); }
+ 	$accessed{$id}=[&gettimeofday()];
+ 	$hits++;
+ 	return ($remembered{$id},1);
+     }
+     my $value = $memcache->get($id);
+     if (!(defined($value))) {
+ 	if ($debug) { &Apache::lonnet::logthis("getting $id is not defined"); }
+ 	return (undef,undef);
+     }
+     if ($value eq '__undef__') {
+ 	if ($debug) { &Apache::lonnet::logthis("getting $id is __undef__"); }
+ 	$value=undef;
+     }
+     &make_room($id,$value,$debug);
+     if ($debug) { &Apache::lonnet::logthis("getting $id is $value"); }
+     return ($value,1);
+ }
+ sub do_cache_new {
+     my ($name,$id,$value,$time,$debug) = @_;
+     $id=&escape($name.':'.$id);
+     my $setvalue=$value;
+     if (!defined($setvalue)) {
+ 	$setvalue='__undef__';
+     }
+     if (!defined($time) ) {
+ 	$time=600;
+     }
+     if ($debug) { &Apache::lonnet::logthis("Setting $id to $value"); }
+     $memcache->set($id,$setvalue,$time);
+     # need to make a copy of $value
+     #&make_room($id,$value,$debug);
+     return $value;
+ }
+ sub make_room {
+     my ($id,$value,$debug)=@_;
+     $remembered{$id}=$value;
+     if ($to_remember<0) { return; }
+     $accessed{$id}=[&gettimeofday()];
+     if (scalar(keys(%remembered)) <= $to_remember) { return; }
+     my $to_kick;
+     my $max_time=0;
+     foreach my $other (keys(%accessed)) {
+ 	if (&tv_interval($accessed{$other}) > $max_time) {
+ 	    $to_kick=$other;
+ 	    $max_time=&tv_interval($accessed{$other});
+ 	}
+     }
+     delete($remembered{$to_kick});
+     delete($accessed{$to_kick});
+     $kicks++;
+     if ($debug) { &logthis("kicking $to_kick $max_time $kicks\n"); }
+     return;
  }
+ sub purge_remembered {
+     #&logthis("Tossing ".scalar(keys(%remembered)));
+     #&logthis(sprintf("%-20s is %s",'%remembered',length(&freeze(\%remembered))));
+     undef(%remembered);
+     undef(%accessed);
+ }
  # ------------------------------------- Read an entry from a user's environment
  sub userenvironment {
- Line 608  sub userenvironment {
+ Line 931  sub userenvironment {
      return %returnhash;
  }
+ # ---------------------------------------------------------- Get a studentphoto
+ sub studentphoto {
+     my ($udom,$unam,$ext) = @_;
+     my $home=&Apache::lonnet::homeserver($unam,$udom);
+     my $ret=&Apache::lonnet::reply("studentphoto:$udom:$unam:$ext",$home);
+     my $url="/uploaded/$udom/$unam/internal/studentphoto.".$ext;
+     if ($ret ne 'ok') {
+ 	return '/adm/lonKaputt/lonlogo_broken.gif';
+     }
+     my $tokenurl=&Apache::lonnet::tokenwrapper($url);
+     return $tokenurl;
+ }
+ # -------------------------------------------------------------------- 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);
+ }
+ # ------------------------------------------ Find current version of a resource
+ sub getversion {
+     my $fname=&clutter(shift);
+     unless ($fname=~/^\/res\//) { return -1; }
+     return &currentversion(&filelocation('',$fname));
+ }
+ sub currentversion {
+     my $fname=shift;
+     my ($result,$cached)=&is_cached_new('resversion',$fname);
+     if (defined($cached)) { return $result; }
+     my $author=$fname;
+     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
+     my ($udom,$uname)=split(/\//,$author);
+     my $home=homeserver($uname,$udom);
+     if ($home eq 'no_host') {
+         return -1;
+     }
+     my $answer=reply("currentversion:$fname",$home);
+     if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
+ 	return -1;
+     }
+     return &do_cache_new('resversion',$fname,$answer,600);
+ }
  # ----------------------------- Subscribe to a resource, return URL if possible
  sub subscribe {
      my $fname=shift;
+     if ($fname=~/\/(aboutme|syllabus|bulletinboard|smppg)$/) { return ''; }
+     $fname=~s/[\n\r]//g;
      my $author=$fname;
      $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
      my ($udom,$uname)=split(/\//,$author);
      my $home=homeserver($uname,$udom);
-     if (($home eq 'no_host') || ($home eq $perlvar{'lonHostID'})) {
+     if ($home eq 'no_host') {
          return 'not_found';
      }
      my $answer=reply("sub:$fname",$home);
      if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
- Line 631  sub subscribe {
+ Line 1007  sub subscribe {
  sub repcopy {
      my $filename=shift;
      $filename=~s/\/+/\//g;
-     if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
+     if ($filename=~m|^/home/httpd/html/adm/|) { return 'ok'; }
+     if ($filename=~m|^/home/httpd/html/lonUsers/|) { return 'ok'; }
+     if ($filename=~m|^/home/httpd/html/userfiles/| or
+ 	$filename=~m -^/*(uploaded|editupload)/-) {
+ 	return &repcopy_userfile($filename);
+     }
+     $filename=~s/[\n\r]//g;
      my $transname="$filename.in.transfer";
-     if ((-e $filename) || (-e $transname)) { return OK; }
+     if ((-e $filename) || (-e $transname)) { return 'ok'; }
      my $remoteurl=subscribe($filename);
      if ($remoteurl =~ /^con_lost by/) {
  	   &logthis("Subscribe returned $remoteurl: $filename");
-            return HTTP_SERVICE_UNAVAILABLE;
+            return 'unavailable';
      } elsif ($remoteurl eq 'not_found') {
- 	   &logthis("Subscribe returned not_found: $filename");
+ 	   #&logthis("Subscribe returned not_found: $filename");
- 	   return HTTP_NOT_FOUND;
+ 	   return 'not_found';
      } elsif ($remoteurl =~ /^rejected by/) {
  	   &logthis("Subscribe returned $remoteurl: $filename");
-            return FORBIDDEN;
+            return 'forbidden';
      } elsif ($remoteurl eq 'directory') {
-            return OK;
+            return 'ok';
      } else {
+         my $author=$filename;
+         $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
+         my ($udom,$uname)=split(/\//,$author);
+         my $home=homeserver($uname,$udom);
+         unless ($home eq $perlvar{'lonHostID'}) {
             my @parts=split(/\//,$filename);
             my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
             if ($path ne "$perlvar{'lonDocRoot'}/res") {
                 &logthis("Malconfiguration for replication: $filename");
- 	       return HTTP_BAD_REQUEST;
+ 	       return 'bad_request';
             }
             my $count;
             for ($count=5;$count<$#parts;$count++) {
- Line 668  sub repcopy {
+ Line 1055  sub repcopy {
                 my $message=$response->status_line;
                 &logthis("<font color=blue>WARNING:"
                         ." LWP get: $message: $filename</font>");
-                return HTTP_SERVICE_UNAVAILABLE;
+                return 'unavailable';
             } else {
  	       if ($remoteurl!~/\.meta$/) {
                    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
- Line 680  sub repcopy {
+ Line 1067  sub repcopy {
                    }
  	       }
                 rename($transname,$filename);
-                return OK;
+                return 'ok';
             }
+        }
      }
  }
+ # ------------------------------------------------ Get server side include body
+ sub ssi_body {
+     my ($filelink,%form)=@_;
+     if (! exists($form{'LONCAPA_INTERNAL_no_discussion'})) {
+         $form{'LONCAPA_INTERNAL_no_discussion'}='true';
+     }
+     my $output=($filelink=~/^http\:/?&externalssi($filelink):
+                                      &ssi($filelink,%form));
+     $output=~s|//(\s*<!--)? BEGIN LON-CAPA Internal.+// END LON-CAPA Internal\s*(-->)?\s||gs;
+     $output=~s/^.*?\<body[^\>]*\>//si;
+     $output=~s/(.*)\<\/body\s*\>.*?$/$1/si;
+     return $output;
+ }
  # --------------------------------------------------------- Server Side Include
  sub ssi {
- Line 708  sub ssi {
+ Line 1110  sub ssi {
      return $response->content;
  }
+ sub externalssi {
+     my ($url)=@_;
+     my $ua=new LWP::UserAgent;
+     my $request=new HTTP::Request('GET',$url);
+     my $response=$ua->request($request);
+     return $response->content;
+ }
+ # -------------------------------- Allow a /uploaded/ URI to be vouched for
+ sub allowuploaded {
+     my ($srcurl,$url)=@_;
+     $url=&clutter(&declutter($url));
+     my $dir=$url;
+     $dir=~s/\/[^\/]+$//;
+     my %httpref=();
+     my $httpurl=&hreflocation('',$url);
+     $httpref{'httpref.'.$httpurl}=$srcurl;
+     &Apache::lonnet::appenv(%httpref);
+ }
+ # --------- File operations in /home/httpd/html/userfiles/$domain/1/2/3/$course
+ # input: action, courseID, current domain, intended
+ #        path to file, source of file, instruction to parse file for objects,
+ #        ref to hash for embedded objects,
+ #        ref to hash for codebase of java objects.
+ #
+ # output: url to file (if action was uploaddoc),
+ #         ok if successful, or diagnostic message otherwise (if action was propagate or copy)
+ #
+ # Allows directory structure to be used within lonUsers/../userfiles/ for a
+ # course.
+ #
+ # action = propagate - /home/httpd/html/userfiles/$domain/1/2/3/$course/$file
+ #          will be copied to /home/httpd/lonUsers/1/2/3/$course/userfiles in
+ #          course's home server.
+ #
+ # action = copy - /home/httpd/html/userfiles/$domain/1/2/3/$course/$file will
+ #          be copied from $source (current location) to
+ #          /home/httpd/html/userfiles/$domain/1/2/3/$course/$file
+ #         and will then be copied to
+ #          /home/httpd/lonUsers/$domain/1/2/3/$course/userfiles/$file in
+ #         course's home server.
+ #
+ # action = uploaddoc - /home/httpd/html/userfiles/$domain/1/2/3/$course/$file
+ #         will be retrived from $env{form.uploaddoc} (from DOCS interface) to
+ #         /home/httpd/html/userfiles/$domain/1/2/3/$course/$file
+ #         and will then be copied to /home/httpd/lonUsers/1/2/3/$course/userfiles/$file
+ #         in course's home server.
+ #
+ sub process_coursefile {
+     my ($action,$docuname,$docudom,$file,$source,$parser,$allfiles,$codebase)=@_;
+     my $fetchresult;
+     my $home=&homeserver($docuname,$docudom);
+     if ($action eq 'propagate') {
+         $fetchresult= &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$file,
+ 			     $home);
+     } else {
+         my $fetchresult = '';
+         my $fpath = '';
+         my $fname = $file;
+         ($fpath,$fname) = ($file =~ m|^(.*)/([^/]+)$|);
+         $fpath=$docudom.'/'.$docuname.'/'.$fpath;
+         my $filepath = &build_filepath($fpath);
+         if ($action eq 'copy') {
+             if ($source eq '') {
+                 $fetchresult = 'no source file';
+                 return $fetchresult;
+             } else {
+                 my $destination = $filepath.'/'.$fname;
+                 rename($source,$destination);
+                 $fetchresult= &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$file,
+                                  $home);
+             }
+         } elsif ($action eq 'uploaddoc') {
+             open(my $fh,'>'.$filepath.'/'.$fname);
+             print $fh $env{'form.'.$source};
+             close($fh);
+             if ($parser eq 'parse') {
+                 my $parse_result = &extract_embedded_items($filepath,$fname,$allfiles,$codebase);
+                 unless ($parse_result eq 'ok') {
+                     &logthis('Failed to parse '.$filepath.'/'.$fname.' for embedded media: '.$parse_result);
+                 }
+             }
+             $fetchresult= &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$file,
+                                  $home);
+             if ($fetchresult eq 'ok') {
+                 return '/uploaded/'.$fpath.'/'.$fname;
+             } else {
+                 &logthis('Failed to transfer '.$docudom.'/'.$docuname.'/'.$file.
+                         ' to host '.$home.': '.$fetchresult);
+                 return '/adm/notfound.html';
+             }
+         }
+     }
+     unless ( $fetchresult eq 'ok') {
+         &logthis('Failed to transfer '.$docudom.'/'.$docuname.'/'.$file.
+              ' to host '.$home.': '.$fetchresult);
+     }
+     return $fetchresult;
+ }
+ sub build_filepath {
+     my ($fpath) = @_;
+     my $filepath=$perlvar{'lonDocRoot'}.'/userfiles';
+     unless ($fpath eq '') {
+         my @parts=split('/',$fpath);
+         foreach my $part (@parts) {
+             $filepath.= '/'.$part;
+             if ((-e $filepath)!=1) {
+                 mkdir($filepath,0777);
+             }
+         }
+     }
+     return $filepath;
+ }
+ sub store_edited_file {
+     my ($primary_url,$content,$docudom,$docuname,$fetchresult) = @_;
+     my $file = $primary_url;
+     $file =~ s#^/uploaded/$docudom/$docuname/##;
+     my $fpath = '';
+     my $fname = $file;
+     ($fpath,$fname) = ($file =~ m|^(.*)/([^/]+)$|);
+     $fpath=$docudom.'/'.$docuname.'/'.$fpath;
+     my $filepath = &build_filepath($fpath);
+     open(my $fh,'>'.$filepath.'/'.$fname);
+     print $fh $content;
+     close($fh);
+     my $home=&homeserver($docuname,$docudom);
+     $$fetchresult= &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$file,
+ 			  $home);
+     if ($$fetchresult eq 'ok') {
+         return '/uploaded/'.$fpath.'/'.$fname;
+     } else {
+         &logthis('Failed to transfer '.$docudom.'/'.$docuname.'/'.$file.
+ 		 ' to host '.$home.': '.$$fetchresult);
+         return '/adm/notfound.html';
+     }
+ }
+ sub clean_filename {
+     my ($fname)=@_;
+ # Replace Windows backslashes by forward slashes
+     $fname=~s/\\/\//g;
+ # Get rid of everything but the actual filename
+     $fname=~s/^.*\/([^\/]+)$/$1/;
+ # Replace spaces by underscores
+     $fname=~s/\s+/\_/g;
+ # Replace all other weird characters by nothing
+     $fname=~s/[^\w\.\-]//g;
+ # Replace all .\d. sequences with _\d. so they no longer look like version
+ # numbers
+     $fname=~s/\.(\d+)(?=\.)/_$1/g;
+     return $fname;
+ }
+ # --------------- Take an uploaded file and put it into the userfiles directory
+ # input: name of form element, coursedoc=1 means this is for the course
+ # output: url of file in userspace
+ sub userfileupload {
+     my ($formname,$coursedoc,$subdir,$parser,$allfiles,$codebase)=@_;
+     if (!defined($subdir)) { $subdir='unknown'; }
+     my $fname=$env{'form.'.$formname.'.filename'};
+     $fname=&clean_filename($fname);
+ # See if there is anything left
+     unless ($fname) { return 'error: no uploaded file'; }
+     chop($env{'form.'.$formname});
+     if (($formname eq 'screenshot') && ($subdir eq 'helprequests')) { #files uploaded to help request form are handled differently
+         my $now = time;
+         my $filepath = 'tmp/helprequests/'.$now;
+         my @parts=split(/\//,$filepath);
+         my $fullpath = $perlvar{'lonDaemons'};
+         for (my $i=0;$i<@parts;$i++) {
+             $fullpath .= '/'.$parts[$i];
+             if ((-e $fullpath)!=1) {
+                 mkdir($fullpath,0777);
+             }
+         }
+         open(my $fh,'>'.$fullpath.'/'.$fname);
+         print $fh $env{'form.'.$formname};
+         close($fh);
+         return $fullpath.'/'.$fname;
+     }
+ # Create the directory if not present
+     $fname="$subdir/$fname";
+     if ($coursedoc) {
+ 	my $docuname=$env{'course.'.$env{'request.course.id'}.'.num'};
+ 	my $docudom=$env{'course.'.$env{'request.course.id'}.'.domain'};
+         if ($env{'form.folder'} =~ m/^(default|supplemental)/) {
+             return &finishuserfileupload($docuname,$docudom,
+ 					 $formname,$fname,$parser,$allfiles,
+ 					 $codebase);
+         } else {
+             $fname=$env{'form.folder'}.'/'.$fname;
+             return &process_coursefile('uploaddoc',$docuname,$docudom,
+ 				       $fname,$formname,$parser,
+ 				       $allfiles,$codebase);
+         }
+     } else {
+         my $docuname=$env{'user.name'};
+         my $docudom=$env{'user.domain'};
+ 	return &finishuserfileupload($docuname,$docudom,$formname,
+ 				     $fname,$parser,$allfiles,$codebase);
+     }
+ }
+ sub finishuserfileupload {
+     my ($docuname,$docudom,$formname,$fname,$parser,$allfiles,$codebase) = @_;
+     my $path=$docudom.'/'.$docuname.'/';
+     my $filepath=$perlvar{'lonDocRoot'};
+     my ($fnamepath,$file);
+     $file=$fname;
+     if ($fname=~m|/|) {
+         ($fnamepath,$file) = ($fname =~ m|^(.*)/([^/]+)$|);
+ 	$path.=$fnamepath.'/';
+     }
+     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
+     {
+ 	open(FH,'>'.$filepath.'/'.$file);
+ 	print FH $env{'form.'.$formname};
+ 	close(FH);
+     }
+     if ($parser eq 'parse') {
+         my $parse_result = &extract_embedded_items($filepath,$file,$allfiles,
+ 						   $codebase);
+         unless ($parse_result eq 'ok') {
+             &logthis('Failed to parse '.$filepath.$file.
+ 		     ' for embedded media: '.$parse_result);
+         }
+     }
+ # Notify homeserver to grep it
+ #
+     my $docuhome=&homeserver($docuname,$docudom);
+     my $fetchresult= &reply('fetchuserfile:'.$path.$file,$docuhome);
+     if ($fetchresult eq 'ok') {
+ #
+ # Return the URL to it
+         return '/uploaded/'.$path.$file;
+     } else {
+         &logthis('Failed to transfer '.$path.$file.' to host '.$docuhome.
+ 		 ': '.$fetchresult);
+         return '/adm/notfound.html';
+     }
+ }
+ sub extract_embedded_items {
+     my ($filepath,$file,$allfiles,$codebase,$content) = @_;
+     my @state = ();
+     my %javafiles = (
+                       codebase => '',
+                       code => '',
+                       archive => ''
+                     );
+     my %mediafiles = (
+                       src => '',
+                       movie => '',
+                      );
+     my $p;
+     if ($content) {
+         $p = HTML::LCParser->new($content);
+     } else {
+         $p = HTML::LCParser->new($filepath.'/'.$file);
+     }
+     while (my $t=$p->get_token()) {
+ 	if ($t->[0] eq 'S') {
+ 	    my ($tagname, $attr) = ($t->[1],$t->[2]);
+ 	    push (@state, $tagname);
+             if (lc($tagname) eq 'allow') {
+                 &add_filetype($allfiles,$attr->{'src'},'src');
+             }
+ 	    if (lc($tagname) eq 'img') {
+ 		&add_filetype($allfiles,$attr->{'src'},'src');
+ 	    }
+             if (lc($tagname) eq 'script') {
+                 if ($attr->{'archive'} =~ /\.jar$/i) {
+                     &add_filetype($allfiles,$attr->{'archive'},'archive');
+                 } else {
+                     &add_filetype($allfiles,$attr->{'src'},'src');
+                 }
+             }
+             if (lc($tagname) eq 'link') {
+                 if (lc($attr->{'rel'}) eq 'stylesheet') {
+                     &add_filetype($allfiles,$attr->{'href'},'href');
+                 }
+             }
+ 	    if (lc($tagname) eq 'object' ||
+ 		(lc($tagname) eq 'embed' && lc($state[-2]) ne 'object')) {
+ 		foreach my $item (keys(%javafiles)) {
+ 		    $javafiles{$item} = '';
+ 		}
+ 	    }
+ 	    if (lc($state[-2]) eq 'object' && lc($tagname) eq 'param') {
+ 		my $name = lc($attr->{'name'});
+ 		foreach my $item (keys(%javafiles)) {
+ 		    if ($name eq $item) {
+ 			$javafiles{$item} = $attr->{'value'};
+ 			last;
+ 		    }
+ 		}
+ 		foreach my $item (keys(%mediafiles)) {
+ 		    if ($name eq $item) {
+ 			&add_filetype($allfiles, $attr->{'value'}, 'value');
+ 			last;
+ 		    }
+ 		}
+ 	    }
+ 	    if (lc($tagname) eq 'embed' || lc($tagname) eq 'applet') {
+ 		foreach my $item (keys(%javafiles)) {
+ 		    if ($attr->{$item}) {
+ 			$javafiles{$item} = $attr->{$item};
+ 			last;
+ 		    }
+ 		}
+ 		foreach my $item (keys(%mediafiles)) {
+ 		    if ($attr->{$item}) {
+ 			&add_filetype($allfiles,$attr->{$item},$item);
+ 			last;
+ 		    }
+ 		}
+ 	    }
+ 	} elsif ($t->[0] eq 'E') {
+ 	    my ($tagname) = ($t->[1]);
+ 	    if ($javafiles{'codebase'} ne '') {
+ 		$javafiles{'codebase'} .= '/';
+ 	    }
+ 	    if (lc($tagname) eq 'applet' ||
+ 		lc($tagname) eq 'object' ||
+ 		(lc($tagname) eq 'embed' && lc($state[-2]) ne 'object')
+ 		) {
+ 		foreach my $item (keys(%javafiles)) {
+ 		    if ($item ne 'codebase' && $javafiles{$item} ne '') {
+ 			my $file=$javafiles{'codebase'}.$javafiles{$item};
+ 			&add_filetype($allfiles,$file,$item);
+ 		    }
+ 		}
+ 	    }
+ 	    pop @state;
+ 	}
+     }
+     return 'ok';
+ }
+ sub add_filetype {
+     my ($allfiles,$file,$type)=@_;
+     if (exists($allfiles->{$file})) {
+ 	unless (grep/^\Q$type\E$/, @{$allfiles->{$file}}) {
+ 	    push(@{$allfiles->{$file}}, &escape($type));
+ 	}
+     } else {
+ 	@{$allfiles->{$file}} = (&escape($type));
+     }
+ }
+ sub removeuploadedurl {
+     my ($url)=@_;
+     my (undef,undef,$udom,$uname,$fname)=split('/',$url,5);
+     return &removeuserfile($uname,$udom,$fname);
+ }
+ sub removeuserfile {
+     my ($docuname,$docudom,$fname)=@_;
+     my $home=&homeserver($docuname,$docudom);
+     return &reply("removeuserfile:$docudom/$docuname/$fname",$home);
+ }
+ sub mkdiruserfile {
+     my ($docuname,$docudom,$dir)=@_;
+     my $home=&homeserver($docuname,$docudom);
+     return &reply("mkdiruserfile:".&escape("$docudom/$docuname/$dir"),$home);
+ }
+ sub renameuserfile {
+     my ($docuname,$docudom,$old,$new)=@_;
+     my $home=&homeserver($docuname,$docudom);
+     return &reply("renameuserfile:$docudom:$docuname:".&escape("$old").':'.
+ 		  &escape("$new"),$home);
+ }
  # ------------------------------------------------------------------------- Log
  sub log {
- Line 716  sub log {
+ Line 1508  sub log {
  }
  # ------------------------------------------------------------------ Course Log
+ #
+ # This routine flushes several buffers of non-mission-critical nature
+ #
  sub flushcourselogs {
-     &logthis('Flushing course log buffers');
+     &logthis('Flushing log buffers');
+ #
+ # course logs
+ # This is a log of all transactions in a course, which can be used
+ # for data mining purposes
+ #
+ # It also collects the courseid database, which lists last transaction
+ # times and course titles for all courseids
+ #
+     my %courseidbuffer=();
      foreach (keys %courselogs) {
          my $crsid=$_;
-         if (&reply('log:'.$coursedombuf{$crsid}.':'.
+         if (&reply('log:'.$coursedombuf{$crsid}.':'.$coursenumbuf{$crsid}.':'.
  		          &escape($courselogs{$crsid}),
  		          $coursehombuf{$crsid}) eq 'ok') {
  	    delete $courselogs{$crsid};
- Line 732  sub flushcourselogs {
+ Line 1536  sub flushcourselogs {
                          " exceeded maximum size, deleting.</font>");
                 delete $courselogs{$crsid};
              }
          }
+         if ($courseidbuffer{$coursehombuf{$crsid}}) {
+            $courseidbuffer{$coursehombuf{$crsid}}.='&'.
+ 			 &escape($crsid).'='.&escape($coursedescrbuf{$crsid}).
+                          ':'.&escape($courseinstcodebuf{$crsid}).':'.&escape($courseownerbuf{$crsid});
+         } else {
+            $courseidbuffer{$coursehombuf{$crsid}}=
+ 			 &escape($crsid).'='.&escape($coursedescrbuf{$crsid}).
+                          ':'.&escape($courseinstcodebuf{$crsid}).':'.&escape($courseownerbuf{$crsid});
+         }
+     }
+ #
+ # Write course id database (reverse lookup) to homeserver of courses
+ # Is used in pickcourse
+ #
+     foreach (keys %courseidbuffer) {
+         &courseidput($hostdom{$_},$courseidbuffer{$_},$_);
+     }
+ #
+ # File accesses
+ # Writes to the dynamic metadata of resources to get hit counts, etc.
+ #
+     foreach my $entry (keys(%accesshash)) {
+         if ($entry =~ /___count$/) {
+             my ($dom,$name);
+             ($dom,$name,undef)=($entry=~m:___(\w+)/(\w+)/(.*)___count$:);
+             if (! defined($dom) || $dom eq '' ||
+                 ! defined($name) || $name eq '') {
+                 my $cid = $env{'request.course.id'};
+                 $dom  = $env{'request.'.$cid.'.domain'};
+                 $name = $env{'request.'.$cid.'.num'};
+             }
+             my $value = $accesshash{$entry};
+             my (undef,$url,undef) = ($entry =~ /^(.*)___(.*)___count$/);
+             my %temphash=($url => $value);
+             my $result = &inc('nohist_accesscount',\%temphash,$dom,$name);
+             if ($result eq 'ok') {
+                 delete $accesshash{$entry};
+             } elsif ($result eq 'unknown_cmd') {
+                 # Target server has old code running on it.
+                 my %temphash=($entry => $value);
+                 if (&put('nohist_resevaldata',\%temphash,$dom,$name) eq 'ok') {
+                     delete $accesshash{$entry};
+                 }
+             }
+         } else {
+             my ($dom,$name) = ($entry=~m:___(\w+)/(\w+)/(.*)___(\w+)$:);
+             my %temphash=($entry => $accesshash{$entry});
+             if (&put('nohist_resevaldata',\%temphash,$dom,$name) eq 'ok') {
+                 delete $accesshash{$entry};
+             }
+         }
      }
-     &logthis('Flushing access logs');
+ #
-     foreach (keys %accesshash) {
+ # Roles
+ # Reverse lookup of user roles for course faculty/staff and co-authorship
+ #
+     foreach (keys %userrolehash) {
          my $entry=$_;
-         $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
+         my ($role,$uname,$udom,$runame,$rudom,$rsec)=
-         my %temphash=($entry => $accesshash{$entry});
+ 	    split(/\:/,$entry);
-         if (&Apache::lonnet::put('resevaldata',\%temphash,$1,$2) eq 'ok') {
+         if (&Apache::lonnet::put('nohist_userroles',
- 	    delete $accesshash{$entry};
+              { $role.':'.$uname.':'.$udom.':'.$rsec => $userrolehash{$entry} },
+                 $rudom,$runame) eq 'ok') {
+ 	    delete $userrolehash{$entry};
          }
      }
      $dumpcount++;
- Line 749  sub flushcourselogs {
+ Line 1609  sub flushcourselogs {
  sub courselog {
      my $what=shift;
      $what=time.':'.$what;
-     unless ($ENV{'request.course.id'}) { return ''; }
+     unless ($env{'request.course.id'}) { return ''; }
-     $coursedombuf{$ENV{'request.course.id'}}=
+     $coursedombuf{$env{'request.course.id'}}=
-        $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
+        $env{'course.'.$env{'request.course.id'}.'.domain'};
-        $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
+     $coursenumbuf{$env{'request.course.id'}}=
-     $coursehombuf{$ENV{'request.course.id'}}=
+        $env{'course.'.$env{'request.course.id'}.'.num'};
-        $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+     $coursehombuf{$env{'request.course.id'}}=
-     if (defined $courselogs{$ENV{'request.course.id'}}) {
+        $env{'course.'.$env{'request.course.id'}.'.home'};
- 	$courselogs{$ENV{'request.course.id'}}.='&'.$what;
+     $coursedescrbuf{$env{'request.course.id'}}=
+        $env{'course.'.$env{'request.course.id'}.'.description'};
+     $courseinstcodebuf{$env{'request.course.id'}}=
+        $env{'course.'.$env{'request.course.id'}.'.internal.coursecode'};
+     $courseownerbuf{$env{'request.course.id'}}=
+        $env{'course.'.$env{'request.course.id'}.'.internal.courseowner'};
+     if (defined $courselogs{$env{'request.course.id'}}) {
+ 	$courselogs{$env{'request.course.id'}}.='&'.$what;
      } else {
- 	$courselogs{$ENV{'request.course.id'}}.=$what;
+ 	$courselogs{$env{'request.course.id'}}.=$what;
      }
-     if (length($courselogs{$ENV{'request.course.id'}})>4048) {
+     if (length($courselogs{$env{'request.course.id'}})>4048) {
  	&flushcourselogs();
      }
  }
  sub courseacclog {
      my $fnsymb=shift;
-     unless ($ENV{'request.course.id'}) { return ''; }
+     unless ($env{'request.course.id'}) { return ''; }
-     my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
+     my $what=$fnsymb.':'.$env{'user.name'}.':'.$env{'user.domain'};
-     if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
+     if ($fnsymb=~/(problem|exam|quiz|assess|survey|form|page)$/) {
          $what.=':POST';
- 	foreach (keys %ENV) {
+         # FIXME: Probably ought to escape things....
+ 	foreach (keys %env) {
              if ($_=~/^form\.(.*)/) {
- 		$what.=':'.$1.'='.$ENV{$_};
+ 		$what.=':'.$1.'='.$env{$_};
+             }
+         }
+     } elsif ($fnsymb =~ m:^/adm/searchcat:) {
+         # FIXME: We should not be depending on a form parameter that someone
+         # editing lonsearchcat.pm might change in the future.
+         if ($env{'form.phase'} eq 'course_search') {
+             $what.= ':POST';
+             # FIXME: Probably ought to escape things....
+             foreach my $element ('courseexp','crsfulltext','crsrelated',
+                                  'crsdiscuss') {
+                 $what.=':'.$element.'='.$env{'form.'.$element};
              }
          }
      }
- Line 782  sub courseacclog {
+ Line 1661  sub courseacclog {
  sub countacc {
      my $url=&declutter(shift);
-     unless ($ENV{'request.course.id'}) { return ''; }
+     return if (! defined($url) || $url eq '');
-     $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
+     unless ($env{'request.course.id'}) { return ''; }
-     my $key=$processmarker.'_'.$dumpcount.'___'.$url.'___count';
+     $accesshash{$env{'request.course.id'}.'___'.$url.'___course'}=1;
-     if (defined($accesshash{$key})) {
+     my $key=$$.$processmarker.'_'.$dumpcount.'___'.$url.'___count';
- 	$accesshash{$key}++;
+     $accesshash{$key}++;
+ }
+ sub linklog {
+     my ($from,$to)=@_;
+     $from=&declutter($from);
+     $to=&declutter($to);
+     $accesshash{$from.'___'.$to.'___comefrom'}=1;
+     $accesshash{$to.'___'.$from.'___goto'}=1;
+ }
+ sub userrolelog {
+     my ($trole,$username,$domain,$area,$tstart,$tend)=@_;
+     if (($trole=~/^ca/) || ($trole=~/^in/) ||
+         ($trole=~/^cc/) || ($trole=~/^ep/) ||
+         ($trole=~/^cr/) || ($trole=~/^ta/)) {
+        my (undef,$rudom,$runame,$rsec)=split(/\//,$area);
+        $userrolehash
+          {$trole.':'.$username.':'.$domain.':'.$runame.':'.$rudom.':'.$rsec}
+                     =$tend.':'.$tstart;
+    }
+ }
+ sub get_course_adv_roles {
+     my $cid=shift;
+     $cid=$env{'request.course.id'} unless (defined($cid));
+     my %coursehash=&coursedescription($cid);
+     my %nothide=();
+     foreach (split(/\s*\,\s*/,$coursehash{'nothideprivileged'})) {
+ 	$nothide{join(':',split(/[\@\:]/,$_))}=1;
+     }
+     my %returnhash=();
+     my %dumphash=
+             &dump('nohist_userroles',$coursehash{'domain'},$coursehash{'num'});
+     my $now=time;
+     foreach (keys %dumphash) {
+ 	my ($tend,$tstart)=split(/\:/,$dumphash{$_});
+         if (($tstart) && ($tstart<0)) { next; }
+         if (($tend) && ($tend<$now)) { next; }
+         if (($tstart) && ($now<$tstart)) { next; }
+         my ($role,$username,$domain,$section)=split(/\:/,$_);
+ 	if ($username eq '' || $domain eq '') { next; }
+ 	if ((&privileged($username,$domain)) &&
+ 	    (!$nothide{$username.':'.$domain})) { next; }
+         my $key=&plaintext($role);
+         if ($section) { $key.=' (Sec/Grp '.$section.')'; }
+         if ($returnhash{$key}) {
+ 	    $returnhash{$key}.=','.$username.':'.$domain;
+         } else {
+             $returnhash{$key}=$username.':'.$domain;
+         }
+      }
+     return %returnhash;
+ }
+ sub get_my_roles {
+     my ($uname,$udom)=@_;
+     unless (defined($uname)) { $uname=$env{'user.name'}; }
+     unless (defined($udom)) { $udom=$env{'user.domain'}; }
+     my %dumphash=
+             &dump('nohist_userroles',$udom,$uname);
+     my %returnhash=();
+     my $now=time;
+     foreach (keys %dumphash) {
+ 	my ($tend,$tstart)=split(/\:/,$dumphash{$_});
+         if (($tstart) && ($tstart<0)) { next; }
+         if (($tend) && ($tend<$now)) { next; }
+         if (($tstart) && ($now<$tstart)) { next; }
+         my ($role,$username,$domain,$section)=split(/\:/,$_);
+ 	$returnhash{$username.':'.$domain.':'.$role}=$tstart.':'.$tend;
+      }
+     return %returnhash;
+ }
+ # ----------------------------------------------------- Frontpage Announcements
+ #
+ #
+ sub postannounce {
+     my ($server,$text)=@_;
+     unless (&allowed('psa',$hostdom{$server})) { return 'refused'; }
+     unless ($text=~/\w/) { $text=''; }
+     return &reply('setannounce:'.&escape($text),$server);
+ }
+ sub getannounce {
+     if (open(my $fh,$perlvar{'lonDocRoot'}.'/announcement.txt')) {
+ 	my $announcement='';
+ 	while (<$fh>) { $announcement .=$_; }
+ 	close($fh);
+ 	if ($announcement=~/\w/) {
+ 	    return
+    '<table bgcolor="#FF5555" cellpadding="5" cellspacing="3">'.
+    '<tr><td bgcolor="#FFFFFF"><tt>'.$announcement.'</tt></td></tr></table>';
+ 	} else {
+ 	    return '';
+ 	}
      } else {
-         $accesshash{$key}=1;
+ 	return '';
      }
  }
+ # ---------------------------------------------------------- Course ID routines
+ # Deal with domain's nohist_courseid.db files
+ #
+ sub courseidput {
+     my ($domain,$what,$coursehome)=@_;
+     return &reply('courseidput:'.$domain.':'.$what,$coursehome);
+ }
+ sub courseiddump {
+     my ($domfilter,$descfilter,$sincefilter,$instcodefilter,$ownerfilter,$coursefilter,$hostidflag,$hostidref)=@_;
+     my %returnhash=();
+     unless ($domfilter) { $domfilter=''; }
+     foreach my $tryserver (keys %libserv) {
+         if ( ($hostidflag == 1 && grep/^$tryserver$/,@{$hostidref}) || (!defined($hostidflag)) ) {
+ 	    if ((!$domfilter) || ($hostdom{$tryserver} eq $domfilter)) {
+ 	        foreach (
+                  split(/\&/,&reply('courseiddump:'.$hostdom{$tryserver}.':'.
+ 			       $sincefilter.':'.&escape($descfilter).':'.
+                                &escape($instcodefilter).':'.&escape($ownerfilter).':'.&escape($coursefilter),
+                                $tryserver))) {
+ 		    my ($key,$value)=split(/\=/,$_);
+                     if (($key) && ($value)) {
+ 		        $returnhash{&unescape($key)}=$value;
+                     }
+                 }
+             }
+         }
+     }
+     return %returnhash;
+ }
+ #
  # ----------------------------------------------------------- Check out an item
+ sub get_first_access {
+     my ($type,$argsymb)=@_;
+     my ($symb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
+     if ($argsymb) { $symb=$argsymb; }
+     my ($map,$id,$res)=&decode_symb($symb);
+     if ($type eq 'map') {
+ 	$res=&symbread($map);
+     } else {
+ 	$res=$symb;
+     }
+     my %times=&get('firstaccesstimes',["$courseid\0$res"],$udom,$uname);
+     return $times{"$courseid\0$res"};
+ }
+ sub set_first_access {
+     my ($type)=@_;
+     my ($symb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
+     my ($map,$id,$res)=&decode_symb($symb);
+     if ($type eq 'map') {
+ 	$res=&symbread($map);
+     } else {
+ 	$res=$symb;
+     }
+     my $firstaccess=&get_first_access($type,$symb);
+     if (!$firstaccess) {
+ 	return &put('firstaccesstimes',{"$courseid\0$res"=>time},$udom,$uname);
+     }
+     return 'already_set';
+ }
  sub checkout {
      my ($symb,$tuname,$tudom,$tcrsid)=@_;
      my $now=time;
- Line 847  sub checkin {
+ Line 1886  sub checkin {
      my $now=time;
      my ($ta,$tb,$lonhost)=split(/\*/,$token);
      $lonhost=~tr/A-Z/a-z/;
-     my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
+     my $dtoken=$ta.'_'.$hostname{$lonhost}.'_'.$tb;
      $dtoken=~s/\W/\_/g;
      my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
                   split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
- Line 859  sub checkin {
+ Line 1898  sub checkin {
      unless (&allowed('mgr',$tcrsid)) {
          &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
-                  $ENV{'user.name'}.' - '.$ENV{'user.domain'});
+                  $env{'user.name'}.' - '.$env{'user.domain'});
          return '';
      }
- Line 883  sub checkin {
+ Line 1922  sub checkin {
  sub expirespread {
      my ($uname,$udom,$stype,$usymb)=@_;
-     my $cid=$ENV{'request.course.id'};
+     my $cid=$env{'request.course.id'};
      if ($cid) {
         my $now=time;
         my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
-        return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
+        return &reply('put:'.$env{'course.'.$cid.'.domain'}.':'.
-                             $ENV{'course.'.$cid.'.num'}.
+                             $env{'course.'.$cid.'.num'}.
  	        	    ':nohist_expirationdates:'.
                              &escape($key).'='.$now,
-                             $ENV{'course.'.$cid.'.home'})
+                             $env{'course.'.$cid.'.home'})
      }
      return 'ok';
  }
- Line 899  sub expirespread {
+ Line 1938  sub expirespread {
  # ----------------------------------------------------- Devalidate Spreadsheets
  sub devalidate {
-     my $symb=shift;
+     my ($symb,$uname,$udom)=@_;
-     my $cid=$ENV{'request.course.id'};
+     my $cid=$env{'request.course.id'};
      if ($cid) {
- 	my $key=$ENV{'user.name'}.':'.$ENV{'user.domain'}.':';
+         # delete the stored spreadsheets for
+         # - the student level sheet of this user in course's homespace
+         # - the assessment level sheet for this resource
+         #   for this user in user's homespace
+ 	# - current conditional state info
+ 	my $key=$uname.':'.$udom.':';
          my $status=
- 	    &del('nohist_calculatedsheet',
+ 	    &del('nohist_calculatedsheets',
- 		 [$key.'studentcalc'],
+ 		 [$key.'studentcalc:'],
- 		 $ENV{'course.'.$cid.'.domain'},
+ 		 $env{'course.'.$cid.'.domain'},
- 		 $ENV{'course.'.$cid.'.num'})
+ 		 $env{'course.'.$cid.'.num'})
  		.' '.
  	    &del('nohist_calculatedsheets_'.$cid,
- 		 [$key.'assesscalc:'.$symb]);
+ 		 [$key.'assesscalc:'.$symb],$udom,$uname);
          unless ($status eq 'ok ok') {
             &logthis('Could not devalidate spreadsheet '.
-                     $ENV{'user.name'}.' at '.$ENV{'user.domain'}.' for '.
+                     $uname.' at '.$udom.' for '.
  		    $symb.': '.$status);
          }
+ 	&delenv('user.state.'.$cid);
+     }
+ }
+ sub get_scalar {
+     my ($string,$end) = @_;
+     my $value;
+     if ($$string =~ s/^([^&]*?)($end)/$2/) {
+ 	$value = $1;
+     } elsif ($$string =~ s/^([^&]*?)&//) {
+ 	$value = $1;
      }
+     return &unescape($value);
+ }
+ sub array2str {
+   my (@array) = @_;
+   my $result=&arrayref2str(\@array);
+   $result=~s/^__ARRAY_REF__//;
+   $result=~s/__END_ARRAY_REF__$//;
+   return $result;
  }
  sub arrayref2str {
    my ($arrayref) = @_;
-   my $result='_ARRAY_REF__';
+   my $result='__ARRAY_REF__';
    foreach my $elem (@$arrayref) {
-     if (ref($elem) eq 'ARRAY') {
+     if(ref($elem) eq 'ARRAY') {
-       $result.=&escape(&arrayref2str($elem)).'&';
+       $result.=&arrayref2str($elem).'&';
-     } elsif (ref($elem) eq 'HASH') {
+     } elsif(ref($elem) eq 'HASH') {
-       $result.=&escape(&hashref2str($elem)).'&';
+       $result.=&hashref2str($elem).'&';
-     } elsif (ref($elem)) {
+     } elsif(ref($elem)) {
-       &logthis("Got a ref of ".(ref($elem))." skipping.");
+       #print("Got a ref of ".(ref($elem))." skipping.");
      } else {
        $result.=&escape($elem).'&';
      }
    }
    $result=~s/\&$//;
+   $result .= '__END_ARRAY_REF__';
    return $result;
  }
  sub hash2str {
    my (%hash) = @_;
    my $result=&hashref2str(\%hash);
-   $result=~s/^_HASH_REF__//;
+   $result=~s/^__HASH_REF__//;
+   $result=~s/__END_HASH_REF__$//;
    return $result;
  }
  sub hashref2str {
    my ($hashref)=@_;
-   my $result='_HASH_REF__';
+   my $result='__HASH_REF__';
-   foreach (keys(%$hashref)) {
+   foreach (sort(keys(%$hashref))) {
      if (ref($_) eq 'ARRAY') {
-       $result.=&escape(&arrayref2str($_)).'=';
+       $result.=&arrayref2str($_).'=';
      } elsif (ref($_) eq 'HASH') {
-       $result.=&escape(&hashref2str($_)).'=';
+       $result.=&hashref2str($_).'=';
      } elsif (ref($_)) {
-       &logthis("Got a ref of ".(ref($_))." skipping.");
+       $result.='=';
+       #print("Got a ref of ".(ref($_))." skipping.");
      } else {
-       $result.=&escape($_).'=';
+ 	if ($_) {$result.=&escape($_).'=';} else { last; }
      }
-     if (ref($$hashref{$_}) eq 'ARRAY') {
+     if(ref($hashref->{$_}) eq 'ARRAY') {
-       $result.=&escape(&arrayref2str($$hashref{$_})).'&';
+       $result.=&arrayref2str($hashref->{$_}).'&';
-     } elsif (ref($$hashref{$_}) eq 'HASH') {
+     } elsif(ref($hashref->{$_}) eq 'HASH') {
-       $result.=&escape(&hashref2str($$hashref{$_})).'&';
+       $result.=&hashref2str($hashref->{$_}).'&';
-     } elsif (ref($$hashref{$_})) {
+     } elsif(ref($hashref->{$_})) {
-       &logthis("Got a ref of ".(ref($$hashref{$_}))." skipping.");
+        $result.='&';
+       #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
      } else {
-       $result.=&escape($$hashref{$_}).'&';
+       $result.=&escape($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 %returnhash;
-   foreach (split(/\&/,$string)) {
+   my %hash;
-     my ($name,$value)=split(/\=/,$_);
-     $name=&unescape($name);
+   if($string !~ /^__HASH_REF__/) {
-     $value=&unescape($value);
+       if (! ($string eq '' || !defined($string))) {
-     if ($value =~ /^_HASH_REF__/) {
+ 	  $hash{'error'}='Not hash reference';
-       $value =~ s/^_HASH_REF__//;
+       }
-       my %hash=&str2hash($value);
+       return (\%hash, $string);
-       $value=\%hash;
+   }
-     } elsif ($value =~ /^_ARRAY_REF__/) {
-       $value =~ s/^_ARRAY_REF__//;
+   $string =~ s/^__HASH_REF__//;
-       my @array=&str2array($value);
-       $value=\@array;
+   while($string !~ /^__END_HASH_REF__/) {
-     }
+       #key
-     $returnhash{$name}=$value;
+       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;
    }
-   return (%returnhash);
+   $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 @returnarray;
+   my @array;
-   foreach my $value (split(/\&/,$string)) {
-     $value=&unescape($value);
+   if($string !~ /^__ARRAY_REF__/) {
-     if ($value =~ /^_HASH_REF__/) {
+       if (! ($string eq '' || !defined($string))) {
-       $value =~ s/^_HASH_REF__//;
+ 	  $array[0]='Array reference error';
-       my %hash=&str2hash($value);
+       }
-       $value=\%hash;
+       return (\@array, $string);
-     } elsif ($value =~ /^_ARRAY_REF__/) {
+   }
-       $value =~ s/^_ARRAY_REF__//;
-       my @array=&str2array($value);
+   $string =~ s/^__ARRAY_REF__//;
-       $value=\@array;
-     }
+   while($string !~ /^__END_ARRAY_REF__/) {
-     push(@returnarray,$value);
+       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);
    }
-   return (@returnarray);
+   $string =~ s/^__END_ARRAY_REF__//;
+   return (\@array, $string);
  }
  # -------------------------------------------------------------------Temp Store
- Line 1018  sub tmpreset {
+ Line 2161  sub tmpreset {
    my ($symb,$namespace,$domain,$stuname) = @_;
    if (!$symb) {
      $symb=&symbread();
-     if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }
+     if (!$symb) { $symb= $env{'request.url'}; }
    }
    $symb=escape($symb);
-   if (!$namespace) { $namespace=$ENV{'request.state'}; }
+   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 (!$domain) { $domain=$ENV{'user.domain'}; }
+   if (!$stuname) { $stuname=$env{'user.name'}; }
-   if (!$stuname) { $stuname=$ENV{'user.name'}; }
+   if ($domain eq 'public' && $stuname eq 'public') {
+       $stuname=$ENV{'REMOTE_ADDR'};
+   }
    my $path=$perlvar{'lonDaemons'}.'/tmp';
    my %hash;
    if (tie(%hash,'GDBM_File',
  	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
- 	  &GDBM_WRCREAT,0640)) {
+ 	  &GDBM_WRCREAT(),0640)) {
      foreach my $key (keys %hash) {
        if ($key=~ /:$symb/) {
  	delete($hash{$key});
- Line 1047  sub tmpstore {
+ Line 2192  sub tmpstore {
    if (!$symb) {
      $symb=&symbread();
-     if (!$symb) { $symb= $ENV{'request.url'}; }
+     if (!$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=$ENV{'request.course.id'};
+     #$namespace=$env{'request.course.id'};
      #if (!$namespace) {
-       $namespace=$ENV{'request.state'};
+       $namespace=$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 (!$domain) { $domain=$ENV{'user.domain'}; }
+   if (!$stuname) { $stuname=$env{'user.name'}; }
-   if (!$stuname) { $stuname=$ENV{'user.name'}; }
+   if ($domain eq 'public' && $stuname eq 'public') {
+       $stuname=$ENV{'REMOTE_ADDR'};
+   }
    my $now=time;
    my %hash;
    my $path=$perlvar{'lonDaemons'}.'/tmp';
    if (tie(%hash,'GDBM_File',
  	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
- 	  &GDBM_WRCREAT,0640)) {
+ 	  &GDBM_WRCREAT(),0640)) {
      $hash{"version:$symb"}++;
      my $version=$hash{"version:$symb"};
      my $allkeys='';
      foreach my $key (keys(%$storehash)) {
        $allkeys.=$key.':';
-       $hash{"$version:$symb:$key"}=$$storehash{$key};
+       $hash{"$version:$symb:$key"}=&freeze_escape($$storehash{$key});
      }
      $hash{"$version:$symb:timestamp"}=$now;
      $allkeys.='timestamp';
- Line 1097  sub tmprestore {
+ Line 2244  sub tmprestore {
    if (!$symb) {
      $symb=&symbread();
-     if (!$symb) { $symb= $ENV{'request.url'}; }
+     if (!$symb) { $symb= $env{'request.url'}; }
    }
    $symb=escape($symb);
-   if (!$namespace) { $namespace=$ENV{'request.state'}; }
+   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'}; }
+   if (!$domain) { $domain=$env{'user.domain'}; }
+   if (!$stuname) { $stuname=$env{'user.name'}; }
+   if ($domain eq 'public' && $stuname eq 'public') {
+       $stuname=$ENV{'REMOTE_ADDR'};
+   }
    my %returnhash;
    $namespace=~s/\//\_/g;
    $namespace=~s/\W//g;
- Line 1113  sub tmprestore {
+ Line 2262  sub tmprestore {
    my $path=$perlvar{'lonDaemons'}.'/tmp';
    if (tie(%hash,'GDBM_File',
  	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
- 	  &GDBM_READER,0640)) {
+ 	  &GDBM_READER(),0640)) {
      my $version=$hash{"version:$symb"};
      $returnhash{'version'}=$version;
      my $scope;
- Line 1123  sub tmprestore {
+ Line 2272  sub tmprestore {
        my $key;
        $returnhash{"$scope:keys"}=$vkeys;
        foreach $key (@keys) {
- 	$returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
+ 	$returnhash{"$scope:$key"}=&thaw_unescape($hash{"$scope:$symb:$key"});
- 	$returnhash{"$key"}=$hash{"$scope:$symb:$key"};
+ 	$returnhash{"$key"}=&thaw_unescape($hash{"$scope:$symb:$key"});
        }
      }
      if (!(untie(%hash))) {
- Line 1147  sub store {
+ Line 2296  sub store {
      $symb=&symbclean($symb);
      if (!$symb) { unless ($symb=&symbread()) { return ''; } }
-     &devalidate($symb);
+     if (!$domain) { $domain=$env{'user.domain'}; }
+     if (!$stuname) { $stuname=$env{'user.name'}; }
+     &devalidate($symb,$stuname,$domain);
      $symb=escape($symb);
      if (!$namespace) {
-        unless ($namespace=$ENV{'request.course.id'}) {
+        unless ($namespace=$env{'request.course.id'}) {
            return '';
         }
      }
-     if (!$domain) { $domain=$ENV{'user.domain'}; }
+     if (!$home) { $home=$env{'user.home'}; }
-     if (!$stuname) { $stuname=$ENV{'user.name'}; }
-     if (!$home) { $home=$ENV{'user.home'}; }
+     $$storehash{'ip'}=$ENV{'REMOTE_ADDR'};
+     $$storehash{'host'}=$perlvar{'lonHostID'};
      my $namevalue='';
      foreach (keys %$storehash) {
-         $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
+         $namevalue.=&escape($_).'='.&freeze_escape($$storehash{$_}).'&';
      }
      $namevalue=~s/\&$//;
      &courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
- Line 1178  sub cstore {
+ Line 2332  sub cstore {
      $symb=&symbclean($symb);
      if (!$symb) { unless ($symb=&symbread()) { return ''; } }
-     &devalidate($symb);
+     if (!$domain) { $domain=$env{'user.domain'}; }
+     if (!$stuname) { $stuname=$env{'user.name'}; }
+     &devalidate($symb,$stuname,$domain);
      $symb=escape($symb);
      if (!$namespace) {
-        unless ($namespace=$ENV{'request.course.id'}) {
+        unless ($namespace=$env{'request.course.id'}) {
            return '';
         }
      }
-     if (!$domain) { $domain=$ENV{'user.domain'}; }
+     if (!$home) { $home=$env{'user.home'}; }
-     if (!$stuname) { $stuname=$ENV{'user.name'}; }
-     if (!$home) { $home=$ENV{'user.home'}; }
+     $$storehash{'ip'}=$ENV{'REMOTE_ADDR'};
+     $$storehash{'host'}=$perlvar{'lonHostID'};
      my $namevalue='';
      foreach (keys %$storehash) {
-         $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
+         $namevalue.=&escape($_).'='.&freeze_escape($$storehash{$_}).'&';
      }
      $namevalue=~s/\&$//;
      &courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
- Line 1214  sub restore {
+ Line 2372  sub restore {
        $symb=&escape(&symbclean($symb));
      }
      if (!$namespace) {
-        unless ($namespace=$ENV{'request.course.id'}) {
+        unless ($namespace=$env{'request.course.id'}) {
            return '';
         }
      }
-     if (!$domain) { $domain=$ENV{'user.domain'}; }
+     if (!$domain) { $domain=$env{'user.domain'}; }
-     if (!$stuname) { $stuname=$ENV{'user.name'}; }
+     if (!$stuname) { $stuname=$env{'user.name'}; }
-     if (!$home) { $home=$ENV{'user.home'}; }
+     if (!$home) { $home=$env{'user.home'}; }
      my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
      my %returnhash=();
      foreach (split(/\&/,$answer)) {
  	my ($name,$value)=split(/\=/,$_);
-         $returnhash{&unescape($name)}=&unescape($value);
+         $returnhash{&unescape($name)}=&thaw_unescape($value);
      }
      my $version;
      for ($version=1;$version<=$returnhash{'version'};$version++) {
- Line 1245  sub coursedescription {
+ Line 2403  sub coursedescription {
      $courseid=~s/\_/\//g;
      my ($cdomain,$cnum)=split(/\//,$courseid);
      my $chome=&homeserver($cnum,$cdomain);
+     my $normalid=$cdomain.'_'.$cnum;
+     # need to always cache even if we get errors otherwise we keep
+     # trying and trying and trying to get the course description.
+     my %envhash=();
+     my %returnhash=();
+     $envhash{'course.'.$normalid.'.last_cache'}=time;
      if ($chome ne 'no_host') {
-        my %returnhash=&dump('environment',$cdomain,$cnum);
+        %returnhash=&dump('environment',$cdomain,$cnum);
         if (!exists($returnhash{'con_lost'})) {
-            my $normalid=$cdomain.'_'.$cnum;
-            my %envhash=();
             $returnhash{'home'}= $chome;
  	   $returnhash{'domain'} = $cdomain;
  	   $returnhash{'num'} = $cnum;
             while (my ($name,$value) = each %returnhash) {
                 $envhash{'course.'.$normalid.'.'.$name}=$value;
             }
-            $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
+            $returnhash{'url'}=&clutter($returnhash{'url'});
             $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
- 	       $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
+ 	       $env{'user.name'}.'_'.$cdomain.'_'.$cnum;
-            $envhash{'course.'.$normalid.'.last_cache'}=time;
             $envhash{'course.'.$normalid.'.home'}=$chome;
             $envhash{'course.'.$normalid.'.domain'}=$cdomain;
             $envhash{'course.'.$normalid.'.num'}=$cnum;
-            &appenv(%envhash);
-            return %returnhash;
         }
      }
-     return ();
+     &appenv(%envhash);
+     return %returnhash;
+ }
+ # -------------------------------------------------See if a user is privileged
+ sub privileged {
+     my ($username,$domain)=@_;
+     my $rolesdump=&reply("dump:$domain:$username:roles",
+ 			&homeserver($username,$domain));
+     if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return 0; }
+     my $now=time;
+     if ($rolesdump ne '') {
+         foreach (split(/&/,$rolesdump)) {
+ 	    if ($_!~/^rolesdef_/) {
+ 		my ($area,$role)=split(/=/,$_);
+ 		$area=~s/\_\w\w$//;
+ 		my ($trole,$tend,$tstart)=split(/_/,$role);
+ 		if (($trole eq 'dc') || ($trole eq 'su')) {
+ 		    my $active=1;
+ 		    if ($tend) {
+ 			if ($tend<$now) { $active=0; }
+ 		    }
+ 		    if ($tstart) {
+ 			if ($tstart>$now) { $active=0; }
+ 		    }
+ 		    if ($active) { return 1; }
+ 		}
+ 	    }
+ 	}
+     }
+     return 0;
  }
  # -------------------------------------------------------- Get user privileges
- Line 1277  sub rolesinit {
+ Line 2467  sub rolesinit {
      my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
      if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
      my %allroles=();
-     my %thesepriv=();
      my $now=time;
      my $userroles="user.login.time=$now\n";
-     my $thesestr;
      if ($rolesdump ne '') {
          foreach (split(/&/,$rolesdump)) {
- 	  if ($_!~/^rolesdef\&/) {
+ 	  if ($_!~/^rolesdef_/) {
              my ($area,$role)=split(/=/,$_);
-             $area=~s/\_\w\w$//;
+ 	    $area=~s/\_\w\w$//;
-             my ($trole,$tend,$tstart)=split(/_/,$role);
-             $userroles.='user.role.'.$trole.'.'.$area.'='.
+             my ($trole,$tend,$tstart);
-                         $tstart.'.'.$tend."\n";
+ 	    if ($role=~/^cr/) {
-             if ($tend!=0) {
+ 		($trole,my $trest)=($role=~m|^(cr/\w+/\w+/[a-zA-Z0-9]+)_(.*)$|);
- 	        if ($tend<$now) {
+ 		($tend,$tstart)=split('_',$trest);
- 	            $trole='';
+ 	    } else {
-                 }
+ 		($trole,$tend,$tstart)=split(/_/,$role);
-             }
+ 	    }
-             if ($tstart!=0) {
+             $userroles.=&set_arearole($trole,$area,$tstart,$tend,$domain,$username);
-                 if ($tstart>$now) {
+             if (($tend!=0) && ($tend<$now)) { $trole=''; }
-                    $trole='';
+             if (($tstart!=0) && ($tstart>$now)) { $trole=''; }
-                 }
-             }
              if (($area ne '') && ($trole ne '')) {
- 	       my $spec=$trole.'.'.$area;
+ 		my $spec=$trole.'.'.$area;
-                my ($tdummy,$tdomain,$trest)=split(/\//,$area);
+ 		my ($tdummy,$tdomain,$trest)=split(/\//,$area);
-                if ($trole =~ /^cr\//) {
+ 		if ($trole =~ /^cr\//) {
- 		   my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
+                     &custom_roleprivs(\%allroles,$trole,$tdomain,$trest,$spec,$area);
-                    my $homsvr=homeserver($rauthor,$rdomain);
+ 		} else {
-                    if ($hostname{$homsvr} ne '') {
+                     &standard_roleprivs(\%allroles,$trole,$tdomain,$spec,$trest,$area);
-                       my $roledef=
+ 		}
- 			  reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",
-                                 $homsvr);
-                       if (($roledef ne 'con_lost') && ($roledef ne '')) {
-                          my ($syspriv,$dompriv,$coursepriv)=
- 			     split(/\_/,unescape($roledef));
-  	                 $allroles{'cm./'}.=':'.$syspriv;
-                          $allroles{$spec.'./'}.=':'.$syspriv;
-                          if ($tdomain ne '') {
-                              $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
-                              $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
-                              if ($trest ne '') {
- 		                $allroles{'cm.'.$area}.=':'.$coursepriv;
- 		                $allroles{$spec.'.'.$area}.=':'.$coursepriv;
-                              }
- 	                 }
-                       }
-                    }
-                } else {
- 	           $allroles{'cm./'}.=':'.$pr{$trole.':s'};
- 	           $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
-                    if ($tdomain ne '') {
-                      $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
-                      $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
-                       if ($trest ne '') {
- 		          $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
- 		          $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
-                       }
- 	           }
- 	       }
              }
            }
          }
-         my $adv=0;
+         my ($author,$adv) = &set_userprivs(\$userroles,\%allroles);
-         my $author=0;
-         foreach (keys %allroles) {
-             %thesepriv=();
-             if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
-             if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
-             foreach (split(/:/,$allroles{$_})) {
-                 if ($_ ne '') {
- 		    my ($privilege,$restrictions)=split(/&/,$_);
-                     if ($restrictions eq '') {
- 			$thesepriv{$privilege}='F';
-                     } else {
-                         if ($thesepriv{$privilege} ne 'F') {
- 			    $thesepriv{$privilege}.=$restrictions;
-                         }
-                     }
-                 }
-             }
-             $thesestr='';
-             foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
-             $userroles.='user.priv.'.$_.'='.$thesestr."\n";
-         }
          $userroles.='user.adv='.$adv."\n".
  	            'user.author='.$author."\n";
-         $ENV{'user.adv'}=$adv;
+         $env{'user.adv'}=$adv;
      }
      return $userroles;
  }
+ sub set_arearole {
+     my ($trole,$area,$tstart,$tend,$domain,$username) = @_;
+ # log the associated role with the area
+     &userrolelog($trole,$username,$domain,$area,$tstart,$tend);
+     return 'user.role.'.$trole.'.'.$area.'='.$tstart.'.'.$tend."\n";
+ }
+ sub custom_roleprivs {
+     my ($allroles,$trole,$tdomain,$trest,$spec,$area) = @_;
+     my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
+     my $homsvr=homeserver($rauthor,$rdomain);
+     if ($hostname{$homsvr} ne '') {
+         my ($rdummy,$roledef)=
+             &get('roles',["rolesdef_$rrole"],$rdomain,$rauthor);
+         if (($rdummy ne 'con_lost') && ($roledef ne '')) {
+             my ($syspriv,$dompriv,$coursepriv)=split(/\_/,$roledef);
+             if (defined($syspriv)) {
+                 $$allroles{'cm./'}.=':'.$syspriv;
+                 $$allroles{$spec.'./'}.=':'.$syspriv;
+             }
+             if ($tdomain ne '') {
+                 if (defined($dompriv)) {
+                     $$allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
+                     $$allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
+                 }
+                 if (($trest ne '') && (defined($coursepriv))) {
+                     $$allroles{'cm.'.$area}.=':'.$coursepriv;
+                     $$allroles{$spec.'.'.$area}.=':'.$coursepriv;
+                 }
+             }
+         }
+     }
+ }
+ sub standard_roleprivs {
+     my ($allroles,$trole,$tdomain,$spec,$trest,$area) = @_;
+     if (defined($pr{$trole.':s'})) {
+         $$allroles{'cm./'}.=':'.$pr{$trole.':s'};
+         $$allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
+     }
+     if ($tdomain ne '') {
+         if (defined($pr{$trole.':d'})) {
+             $$allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
+             $$allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
+         }
+         if (($trest ne '') && (defined($pr{$trole.':c'}))) {
+             $$allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
+             $$allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
+         }
+     }
+ }
+ sub set_userprivs {
+     my ($userroles,$allroles) = @_;
+     my $author=0;
+     my $adv=0;
+     foreach (keys %{$allroles}) {
+         my %thesepriv=();
+         if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
+         foreach (split(/:/,$$allroles{$_})) {
+             if ($_ ne '') {
+                 my ($privilege,$restrictions)=split(/&/,$_);
+                 if ($restrictions eq '') {
+                     $thesepriv{$privilege}='F';
+                 } elsif ($thesepriv{$privilege} ne 'F') {
+                     $thesepriv{$privilege}.=$restrictions;
+                 }
+                 if ($thesepriv{'adv'} eq 'F') { $adv=1; }
+             }
+         }
+         my $thesestr='';
+         foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
+         $$userroles.='user.priv.'.$_.'='.$thesestr."\n";
+     }
+     return ($author,$adv);
+ }
  # --------------------------------------------------------------- get interface
  sub get {
- Line 1378  sub get {
+ Line 2592  sub get {
         $items.=escape($_).'&';
     }
     $items=~s/\&$//;
-    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
-    if (!$uname) { $uname=$ENV{'user.name'}; }
+    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 $i=0;
     foreach (@$storearr) {
-       $returnhash{$_}=unescape($pairs[$i]);
+       $returnhash{$_}=&thaw_unescape($pairs[$i]);
        $i++;
     }
     return %returnhash;
- Line 1402  sub del {
+ Line 2619  sub del {
         $items.=escape($_).'&';
     }
     $items=~s/\&$//;
-    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
-    if (!$uname) { $uname=$ENV{'user.name'}; }
+    if (!$uname) { $uname=$env{'user.name'}; }
     my $uhome=&homeserver($uname,$udomain);
     return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
- Line 1413  sub del {
+ Line 2630  sub del {
  sub dump {
     my ($namespace,$udomain,$uname,$regexp)=@_;
-    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
-    if (!$uname) { $uname=$ENV{'user.name'}; }
+    if (!$uname) { $uname=$env{'user.name'}; }
     my $uhome=&homeserver($uname,$udomain);
     if ($regexp) {
         $regexp=&escape($regexp);
- Line 1426  sub dump {
+ Line 2643  sub dump {
     my %returnhash=();
     foreach (@pairs) {
        my ($key,$value)=split(/=/,$_);
-       $returnhash{unescape($key)}=unescape($value);
+       $returnhash{unescape($key)}=&thaw_unescape($value);
     }
     return %returnhash;
  }
+ # -------------------------------------------------------------- keys interface
+ sub getkeys {
+    my ($namespace,$udomain,$uname)=@_;
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
+    if (!$uname) { $uname=$env{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
+    my $rep=reply("keys:$udomain:$uname:$namespace",$uhome);
+    my @keyarray=();
+    foreach (split(/\&/,$rep)) {
+       push (@keyarray,&unescape($_));
+    }
+    return @keyarray;
+ }
+ # --------------------------------------------------------------- currentdump
+ sub currentdump {
+    my ($courseid,$sdom,$sname)=@_;
+    $courseid = $env{'request.course.id'} if (! defined($courseid));
+    $sdom     = $env{'user.domain'}       if (! defined($sdom));
+    $sname    = $env{'user.name'}         if (! defined($sname));
+    my $uhome = &homeserver($sname,$sdom);
+    my $rep=reply('currentdump:'.$sdom.':'.$sname.':'.$courseid,$uhome);
+    return if ($rep =~ /^(error:|no_such_host)/);
+    #
+    my %returnhash=();
+    #
+    if ($rep eq "unknown_cmd") {
+        # an old lond will not know currentdump
+        # Do a dump and make it look like a currentdump
+        my @tmp = &dump($courseid,$sdom,$sname,'.');
+        return if ($tmp[0] =~ /^(error:|no_such_host)/);
+        my %hash = @tmp;
+        @tmp=();
+        %returnhash = %{&convert_dump_to_currentdump(\%hash)};
+    } else {
+        my @pairs=split(/\&/,$rep);
+        foreach (@pairs) {
+            my ($key,$value)=split(/=/,$_);
+            my ($symb,$param) = split(/:/,$key);
+            $returnhash{&unescape($symb)}->{&unescape($param)} =
+                                                         &thaw_unescape($value);
+        }
+    }
+    return %returnhash;
+ }
+ sub convert_dump_to_currentdump{
+     my %hash = %{shift()};
+     my %returnhash;
+     # Code ripped from lond, essentially.  The only difference
+     # here is the unescaping done by lonnet::dump().  Conceivably
+     # we might run in to problems with parameter names =~ /^v\./
+     while (my ($key,$value) = each(%hash)) {
+         my ($v,$symb,$param) = split(/:/,$key);
+         next if ($v eq 'version' || $symb eq 'keys');
+         next if (exists($returnhash{$symb}) &&
+                  exists($returnhash{$symb}->{$param}) &&
+                  $returnhash{$symb}->{'v.'.$param} > $v);
+         $returnhash{$symb}->{$param}=$value;
+         $returnhash{$symb}->{'v.'.$param}=$v;
+     }
+     #
+     # Remove all of the keys in the hashes which keep track of
+     # the version of the parameter.
+     while (my ($symb,$param_hash) = each(%returnhash)) {
+         # use a foreach because we are going to delete from the hash.
+         foreach my $key (keys(%$param_hash)) {
+             delete($param_hash->{$key}) if ($key =~ /^v\./);
+         }
+     }
+     return \%returnhash;
+ }
+ # ------------------------------------------------------ critical inc interface
+ sub cinc {
+     return &inc(@_,'critical');
+ }
+ # --------------------------------------------------------------- inc interface
+ sub inc {
+     my ($namespace,$store,$udomain,$uname,$critical) = @_;
+     if (!$udomain) { $udomain=$env{'user.domain'}; }
+     if (!$uname) { $uname=$env{'user.name'}; }
+     my $uhome=&homeserver($uname,$udomain);
+     my $items='';
+     if (! ref($store)) {
+         # got a single value, so use that instead
+         $items = &escape($store).'=&';
+     } elsif (ref($store) eq 'SCALAR') {
+         $items = &escape($$store).'=&';
+     } elsif (ref($store) eq 'ARRAY') {
+         $items = join('=&',map {&escape($_);} @{$store});
+     } elsif (ref($store) eq 'HASH') {
+         while (my($key,$value) = each(%{$store})) {
+             $items.= &escape($key).'='.&escape($value).'&';
+         }
+     }
+     $items=~s/\&$//;
+     if ($critical) {
+ 	return &critical("inc:$udomain:$uname:$namespace:$items",$uhome);
+     } else {
+ 	return &reply("inc:$udomain:$uname:$namespace:$items",$uhome);
+     }
+ }
  # --------------------------------------------------------------- put interface
  sub put {
     my ($namespace,$storehash,$udomain,$uname)=@_;
-    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
-    if (!$uname) { $uname=$ENV{'user.name'}; }
+    if (!$uname) { $uname=$env{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
+    my $items='';
+    foreach (keys %$storehash) {
+        $items.=&escape($_).'='.&freeze_escape($$storehash{$_}).'&';
+    }
+    $items=~s/\&$//;
+    return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
+ }
+ # ------------------------------------------------------------ newput interface
+ sub newput {
+    my ($namespace,$storehash,$udomain,$uname)=@_;
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
+    if (!$uname) { $uname=$env{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
+    my $items='';
+    foreach my $key (keys(%$storehash)) {
+        $items.=&escape($key).'='.&freeze_escape($$storehash{$key}).'&';
+    }
+    $items=~s/\&$//;
+    return &reply("newput:$udomain:$uname:$namespace:$items",$uhome);
+ }
+ # ---------------------------------------------------------  putstore interface
+ sub putstore {
+    my ($namespace,$storehash,$udomain,$uname)=@_;
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
+    if (!$uname) { $uname=$env{'user.name'}; }
     my $uhome=&homeserver($uname,$udomain);
     my $items='';
+    my %allitems = ();
     foreach (keys %$storehash) {
-        $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
+        if ($_ =~ m/^([^\:]+):([^\:]+):([^\:]+)$/) {
+            my $key = $1.':keys:'.$2;
+            $allitems{$key} .= $3.':';
+        }
+        $items.=$_.'='.&freeze_escape($$storehash{$_}).'&';
+    }
+    foreach (keys %allitems) {
+        $allitems{$_} =~ s/\:$//;
+        $items.= $_.'='.$allitems{$_}.'&';
     }
     $items=~s/\&$//;
     return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
- Line 1450  sub put {
+ Line 2814  sub put {
  sub cput {
     my ($namespace,$storehash,$udomain,$uname)=@_;
-    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
-    if (!$uname) { $uname=$ENV{'user.name'}; }
+    if (!$uname) { $uname=$env{'user.name'}; }
     my $uhome=&homeserver($uname,$udomain);
     my $items='';
     foreach (keys %$storehash) {
-        $items.=escape($_).'='.escape($$storehash{$_}).'&';
+        $items.=escape($_).'='.&freeze_escape($$storehash{$_}).'&';
     }
     $items=~s/\&$//;
     return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
- Line 1470  sub eget {
+ Line 2834  sub eget {
         $items.=escape($_).'&';
     }
     $items=~s/\&$//;
-    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+    if (!$udomain) { $udomain=$env{'user.domain'}; }
-    if (!$uname) { $uname=$ENV{'user.name'}; }
+    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 $i=0;
     foreach (@$storearr) {
-       $returnhash{$_}=unescape($pairs[$i]);
+       $returnhash{$_}=&thaw_unescape($pairs[$i]);
        $i++;
     }
     return %returnhash;
  }
- # ------------------------------------------------- Check for a user privilege
+ # ---------------------------------------------- Custom access rule evaluation
- sub allowed {
+ sub customaccess {
      my ($priv,$uri)=@_;
+     my ($urole,$urealm)=split(/\./,$env{'request.role'});
+     $urealm=~s/^\W//;
+     my ($udom,$ucrs,$usec)=split(/\//,$urealm);
+     my $access=0;
+     foreach (split(/\s*\,\s*/,&metadata($uri,'rule_rights'))) {
+ 	my ($effect,$realm,$role)=split(/\:/,$_);
+         if ($role) {
+ 	   if ($role ne $urole) { next; }
+         }
+         foreach (split(/\s*\,\s*/,$realm)) {
+             my ($tdom,$tcrs,$tsec)=split(/\_/,$_);
+             if ($tdom) {
+ 		if ($tdom ne $udom) { next; }
+             }
+             if ($tcrs) {
+ 		if ($tcrs ne $ucrs) { next; }
+             }
+             if ($tsec) {
+ 		if ($tsec ne $usec) { next; }
+             }
+             $access=($effect eq 'allow');
+             last;
+         }
+ 	if ($realm eq '' && $role eq '') {
+             $access=($effect eq 'allow');
+ 	}
+     }
+     return $access;
+ }
+ # ------------------------------------------------- Check for a user privilege
+ sub allowed {
+     my ($priv,$uri,$symb)=@_;
+     $uri=&deversion($uri);
      my $orguri=$uri;
      $uri=&declutter($uri);
+     if (defined($env{'allowed.'.$priv})) { return $env{'allowed.'.$priv}; }
  # Free bre access to adm and meta resources
+     if (((($uri=~/^adm\//) && ($uri !~ m|/bulletinboard$|))
-     if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
+ 	 || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
  	return 'F';
      }
+ # Free bre access to user's own portfolio contents
+     my ($space,$domain,$name,$dir)=split('/',$uri);
+     if (($space=~/^(uploaded|editupload)$/) && ($env{'user.name'} eq $name) &&
+ 	($env{'user.domain'} eq $domain) && ('portfolio' eq $dir)) {
+         return 'F';
+     }
  # Free bre to public access
      if ($priv eq 'bre') {
          my $copyright=&metadata($uri,'copyright');
- 	if ($copyright eq 'public') { return 'F'; }
+ 	if (($copyright eq 'public') && (!$env{'request.course.id'})) {
+            return 'F';
+         }
          if ($copyright eq 'priv') {
              $uri=~/([^\/]+)\/([^\/]+)\//;
- 	    unless (($ENV{'user.name'} eq $2) && ($ENV{'user.domain'} eq $1)) {
+ 	    unless (($env{'user.name'} eq $2) && ($env{'user.domain'} eq $1)) {
  		return '';
              }
          }
          if ($copyright eq 'domain') {
              $uri=~/([^\/]+)\/([^\/]+)\//;
- 	    unless (($ENV{'user.domain'} eq $1) ||
+ 	    unless (($env{'user.domain'} eq $1) ||
-                  ($ENV{'course.'.$ENV{'request.course.id'}.'.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';
+         }
+         if ($copyright eq 'custom') {
+ 	    unless (&customaccess($priv,$uri)) { return ''; }
+         }
+     }
+     # Domain coordinator is trying to create a course
+     if (($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 $thisallowed='';
- Line 1524  sub allowed {
+ Line 2948  sub allowed {
  # Course
-     if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
+     if ($env{'user.priv.'.$env{'request.role'}.'./'}=~/\Q$priv\E\&([^\:]*)/) {
         $thisallowed.=$1;
      }
  # Domain
-     if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
+     if ($env{'user.priv.'.$env{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
-        =~/$priv\&([^\:]*)/) {
+        =~/\Q$priv\E\&([^\:]*)/) {
         $thisallowed.=$1;
      }
- Line 1540  sub allowed {
+ Line 2964  sub allowed {
      $courseuri=~s/\_(\d)/\/$1/;
      $courseuri=~s/^([^\/])/\/$1/;
-     if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
+     if ($env{'user.priv.'.$env{'request.role'}.'.'.$courseuri}
-        =~/$priv\&([^\:]*)/) {
+        =~/\Q$priv\E\&([^\:]*)/) {
         $thisallowed.=$1;
      }
+ # URI is an uploaded document for this course
+ # not allowing 'edit' access (editupload) to uploaded course docs
+     if (($priv eq 'bre') && ($uri=~m|^uploaded/|)) {
+ 	my $refuri=$env{'httpref.'.$orguri};
+ 	if ($refuri) {
+ 	    if ($refuri =~ m|^/adm/|) {
+ 		$thisallowed='F';
+ 	    }
+ 	}
+     }
  # Full access at system, domain or course-wide level? Exit.
      if ($thisallowed=~/F/) {
- Line 1553  sub allowed {
+ Line 2988  sub allowed {
  # If this is generating or modifying users, exit with special codes
-     if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
+     if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:caa:'=~/\:\Q$priv\E\:/) {
+ 	if (($priv eq 'cca') || ($priv eq 'caa')) {
+ 	    my ($audom,$auname)=split('/',$uri);
+ # no author name given, so this just checks on the general right to make a co-author in this domain
+ 	    unless ($auname) { return $thisallowed; }
+ # an author name is given, so we are about to actually make a co-author for a certain account
+ 	    if (($auname ne $env{'user.name'} && $env{'request.role'} !~ /^dc\./) ||
+ 		(($audom ne $env{'user.domain'} && $env{'request.role'} !~ /^dc\./) &&
+ 		 ($audom ne $env{'request.role.domain'}))) { return ''; }
+ 	}
  	return $thisallowed;
      }
  #
- Line 1562  sub allowed {
+ Line 3006  sub allowed {
  # Course: See if uri or referer is an individual resource that is part of
  # the course
-     if ($ENV{'request.course.id'}) {
+     if ($env{'request.course.id'}) {
-        $courseprivid=$ENV{'request.course.id'};
+        $courseprivid=$env{'request.course.id'};
-        if ($ENV{'request.course.sec'}) {
+        if ($env{'request.course.sec'}) {
-           $courseprivid.='/'.$ENV{'request.course.sec'};
+           $courseprivid.='/'.$env{'request.course.sec'};
         }
         $courseprivid=~s/\_/\//;
         my $checkreferer=1;
         my ($match,$cond)=&is_on_map($uri);
         if ($match) {
             $statecond=$cond;
-            if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
+            if ($env{'user.priv.'.$env{'request.role'}.'./'.$courseprivid}
-                =~/$priv\&([^\:]*)/) {
+                =~/\Q$priv\E\&([^\:]*)/) {
                 $thisallowed.=$1;
                 $checkreferer=0;
             }
         }
         if ($checkreferer) {
- 	  my $refuri=$ENV{'httpref.'.$orguri};
+ 	  my $refuri=$env{'httpref.'.$orguri};
              unless ($refuri) {
-                 foreach (keys %ENV) {
+                 foreach (keys %env) {
  		    if ($_=~/^httpref\..*\*/) {
  			my $pattern=$_;
                          $pattern=~s/^httpref\.\/res\///;
                          $pattern=~s/\*/\[\^\/\]\+/g;
                          $pattern=~s/\//\\\//g;
                          if ($orguri=~/$pattern/) {
- 			    $refuri=$ENV{$_};
+ 			    $refuri=$env{$_};
                          }
                      }
                  }
- Line 1601  sub allowed {
+ Line 3045  sub allowed {
            my ($match,$cond)=&is_on_map($refuri);
              if ($match) {
                my $refstatecond=$cond;
-               if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
+               if ($env{'user.priv.'.$env{'request.role'}.'./'.$courseprivid}
-                   =~/$priv\&([^\:]*)/) {
+                   =~/\Q$priv\E\&([^\:]*)/) {
                    $thisallowed.=$1;
                    $uri=$refuri;
                    $statecond=$refstatecond;
- Line 1641  sub allowed {
+ Line 3085  sub allowed {
      my $envkey;
      if ($thisallowed=~/L/) {
-         foreach $envkey (keys %ENV) {
+         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 $roleid) {
+                if ($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) {
+                if ((time-$env{$prefix.'last_cache'})>$expiretime) {
  		   &coursedescription($courseid);
                 }
-                if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
+                if (($env{$prefix.'res.'.$uri.'.lock.sections'}=~/\,\Q$csec\E\,/)
-                 || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
+                 || ($env{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
- 		   if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
+ 		   if ($env{$prefix.'res.'.$uri.'.lock.expire'}>time) {
-                        &log($ENV{'user.domain'},$ENV{'user.name'},
+                        &log($env{'user.domain'},$env{'user.name'},
-                             $ENV{'user.home'},
+                             $env{'user.home'},
                              'Locked by res: '.$priv.' for '.$uri.' due to '.
                              $cdom.'/'.$cnum.'/'.$csec.' expire '.
-                             $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
+                             $env{$prefix.'priv.'.$priv.'.lock.expire'});
  		       return '';
                     }
                 }
-                if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
+                if (($env{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,\Q$csec\E\,/)
-                 || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
+                 || ($env{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
- 		   if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
+ 		   if ($env{'priv.'.$priv.'.lock.expire'}>time) {
-                        &log($ENV{'user.domain'},$ENV{'user.name'},
+                        &log($env{'user.domain'},$env{'user.name'},
-                             $ENV{'user.home'},
+                             $env{'user.home'},
                              'Locked by priv: '.$priv.' for '.$uri.' due to '.
                              $cdom.'/'.$cnum.'/'.$csec.' expire '.
-                             $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
+                             $env{$prefix.'priv.'.$priv.'.lock.expire'});
  		       return '';
                     }
                 }
- Line 1685  sub allowed {
+ Line 3129  sub allowed {
  # Rest of the restrictions depend on selected course
  #
-     unless ($ENV{'request.course.id'}) {
+     unless ($env{'request.course.id'}) {
         return '1';
      }
- Line 1697  sub allowed {
+ Line 3141  sub allowed {
  # Course preferences
     if ($thisallowed=~/C/) {
-        my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
+        my $rolecode=(split(/\./,$env{'request.role'}))[0];
-        my $unamedom=$ENV{'user.name'}.':'.$ENV{'user.domain'};
+        my $unamedom=$env{'user.name'}.':'.$env{'user.domain'};
-        if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
+        if ($env{'course.'.$env{'request.course.id'}.'.'.$priv.'.roles.denied'}
- 	   =~/$rolecode/) {
+ 	   =~/\Q$rolecode\E/) {
-            &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
+            &log($env{'user.domain'},$env{'user.name'},$env{'user.host'},
                  'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
-                 $ENV{'request.course.id'});
+                 $env{'request.course.id'});
             return '';
         }
-        if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.users.denied'}
+        if ($env{'course.'.$env{'request.course.id'}.'.'.$priv.'.users.denied'}
- 	   =~/$unamedom/) {
+ 	   =~/\Q$unamedom\E/) {
-            &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
+            &log($env{'user.domain'},$env{'user.name'},$env{'user.host'},
                  'Denied by user: '.$priv.' for '.$uri.' as '.$unamedom.' in '.
-                 $ENV{'request.course.id'});
+                 $env{'request.course.id'});
             return '';
         }
     }
- Line 1719  sub allowed {
+ Line 3163  sub allowed {
  # Resource preferences
     if ($thisallowed=~/R/) {
-        my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
+        my $rolecode=(split(/\./,$env{'request.role'}))[0];
-        my $filename=$perlvar{'lonDocRoot'}.'/res/'.$uri.'.meta';
+        if (&metadata($uri,'roledeny')=~/\Q$rolecode\E/) {
-        if (-e $filename) {
+ 	  &log($env{'user.domain'},$env{'user.name'},$env{'user.host'},
-            my @content;
-            {
- 	     my $fh=Apache::File->new($filename);
-              @content=<$fh>;
- 	   }
-            if (join('',@content)=~
-                     /\<roledeny[^\>]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {
- 	       &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
                      'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
-            return '';
+           return '';
-            }
         }
     }
- # Restricted by state?
+ # Restricted by state or randomout?
     if ($thisallowed=~/X/) {
+       if ($env{'acc.randomout'}) {
+ 	 if (!$symb) { $symb=&symbread($uri,1); }
+          if (($symb) && ($env{'acc.randomout'}=~/\&\Q$symb\E\&/)) {
+             return '';
+          }
+       }
        if (&condval($statecond)) {
  	 return '2';
        } else {
- Line 1754  sub allowed {
+ Line 3194  sub allowed {
  sub is_on_map {
      my $uri=&declutter(shift);
+     $uri=~s/\.\d+\.(\w+)$/\.$1/;
      my @uriparts=split(/\//,$uri);
      my $filename=$uriparts[$#uriparts];
      my $pathname=$uri;
-     $pathname=~s/\/$filename$//;
+     $pathname=~s|/\Q$filename\E$||;
-     my $match=($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
+     $pathname=~s/^adm\/wrapper\///;
- 	       /\&$filename\:([\d\|]+)\&/);
+     #Trying to find the conditional for the file
+     my $match=($env{'acc.res.'.$env{'request.course.id'}.'.'.$pathname}=~
+ 	       /\&\Q$filename\E\:([\d\|]+)\&/);
      if ($match) {
-        return (1,$1);
+ 	return (1,$1);
-    } else {
+     } else {
-        return (0,0);
+ 	return (0,0);
-    }
+     }
+ }
+ # --------------------------------------------------------- Get symb from alias
+ sub get_symb_from_alias {
+     my $symb=shift;
+     my ($map,$resid,$url)=&decode_symb($symb);
+ # Already is a symb
+     if ($url) { return $symb; }
+ # Must be an alias
+     my $aliassymb='';
+     my %bighash;
+     if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
+                             &GDBM_READER(),0640)) {
+         my $rid=$bighash{'mapalias_'.$symb};
+ 	if ($rid) {
+ 	    my ($mapid,$resid)=split(/\./,$rid);
+ 	    $aliassymb=&encode_symb($bighash{'map_id_'.$mapid},
+ 				    $resid,$bighash{'src_'.$rid});
+ 	}
+         untie %bighash;
+     }
+     return $aliassymb;
  }
  # ----------------------------------------------------------------- Define Role
- Line 1772  sub is_on_map {
+ Line 3238  sub is_on_map {
  sub definerole {
    if (allowed('mcr','/')) {
      my ($rolename,$sysrole,$domrole,$courole)=@_;
-     foreach (split('/',$sysrole)) {
+     foreach (split(':',$sysrole)) {
  	my ($crole,$cqual)=split(/\&/,$_);
-         if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
+         if ($pr{'cr:s'}!~/\Q$crole\E/) { return "refused:s:$crole"; }
-         if ($pr{'cr:s'}=~/$crole\&/) {
+         if ($pr{'cr:s'}=~/\Q$crole\E\&/) {
- 	    if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
+ 	    if ($pr{'cr:s'}!~/\Q$crole\E\&\w*\Q$cqual\E/) {
                 return "refused:s:$crole&$cqual";
              }
          }
      }
-     foreach (split('/',$domrole)) {
+     foreach (split(':',$domrole)) {
  	my ($crole,$cqual)=split(/\&/,$_);
-         if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
+         if ($pr{'cr:d'}!~/\Q$crole\E/) { return "refused:d:$crole"; }
-         if ($pr{'cr:d'}=~/$crole\&/) {
+         if ($pr{'cr:d'}=~/\Q$crole\E\&/) {
- 	    if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
+ 	    if ($pr{'cr:d'}!~/\Q$crole\W\&\w*\Q$cqual\E/) {
                 return "refused:d:$crole&$cqual";
              }
          }
      }
-     foreach (split('/',$courole)) {
+     foreach (split(':',$courole)) {
  	my ($crole,$cqual)=split(/\&/,$_);
-         if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
+         if ($pr{'cr:c'}!~/\Q$crole\E/) { return "refused:c:$crole"; }
-         if ($pr{'cr:c'}=~/$crole\&/) {
+         if ($pr{'cr:c'}=~/\Q$crole\E\&/) {
- 	    if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
+ 	    if ($pr{'cr:c'}!~/\Q$crole\E\&\w*\Q$cqual\E/) {
                 return "refused:c:$crole&$cqual";
              }
          }
      }
-     my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
+     my $command="encrypt:rolesput:$env{'user.domain'}:$env{'user.name'}:".
-                 "$ENV{'user.domain'}:$ENV{'user.name'}:".
+                 "$env{'user.domain'}:$env{'user.name'}:".
  	        "rolesdef_$rolename=".
                  escape($sysrole.'_'.$domrole.'_'.$courole);
-     return reply($command,$ENV{'user.home'});
+     return reply($command,$env{'user.home'});
    } else {
      return 'refused';
    }
- Line 1812  sub definerole {
+ Line 3278  sub definerole {
  # ---------------- Make a metadata query against the network of library servers
  sub metadata_query {
-     my ($query,$custom,$customshow)=@_;
+     my ($query,$custom,$customshow,$server_array)=@_;
      my %rhash;
-     for my $server (keys %libserv) {
+     my @server_list = (defined($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;
- Line 1839  sub log_query {
+ Line 3307  sub log_query {
      my $command=&escape(join(':',map{$_.'='.$filters{$_}} keys %filters));
      my $queryid=&reply("querysend:".$query.':'.$udom.':'.$uname.':'.$command,
                         $uhome);
-     unless ($queryid=~/^$uhost\_/) { return 'error: '.$queryid; }
+     unless ($queryid=~/^\Q$uhost\E\_/) { return 'error: '.$queryid; }
      return get_query_reply($queryid);
  }
+ # ------- Request retrieval of institutional classlists for course(s)
+ sub fetch_enrollment_query {
+     my ($context,$affiliatesref,$replyref,$dom,$cnum) = @_;
+     my $homeserver;
+     my $maxtries = 1;
+     if ($context eq 'automated') {
+         $homeserver = $perlvar{'lonHostID'};
+         $maxtries = 10; # will wait for up to 2000s for retrieval of classlist data before timeout
+     } else {
+         $homeserver = &homeserver($cnum,$dom);
+     }
+     my $host=$hostname{$homeserver};
+     my $cmd = '';
+     foreach (keys %{$affiliatesref}) {
+         $cmd .= $_.'='.join(",",@{$$affiliatesref{$_}}).'%%';
+     }
+     $cmd =~ s/%%$//;
+     $cmd = &escape($cmd);
+     my $query = 'fetchenrollment';
+     my $queryid=&reply("querysend:".$query.':'.$dom.':'.$env{'user.name'}.':'.$cmd,$homeserver);
+     unless ($queryid=~/^\Q$host\E\_/) {
+         &logthis('fetch_enrollment_query: invalid queryid: '.$queryid.' for host: '.$host.' and homeserver: '.$homeserver.' context: '.$context.' '.$cnum);
+         return 'error: '.$queryid;
+     }
+     my $reply = &get_query_reply($queryid);
+     my $tries = 1;
+     while (($reply=~/^timeout/) && ($tries < $maxtries)) {
+         $reply = &get_query_reply($queryid);
+         $tries ++;
+     }
+     if ( ($reply =~/^timeout/) || ($reply =~/^error/) ) {
+         &logthis('fetch_enrollment_query error: '.$reply.' for '.$dom.' '.$env{'user.name'}.' for '.$queryid.' context: '.$context.' '.$cnum.' maxtries: '.$maxtries.' tries: '.$tries);
+     } else {
+         my @responses = split/:/,$reply;
+         if ($homeserver eq $perlvar{'lonHostID'}) {
+             foreach (@responses) {
+                 my ($key,$value) = split/=/,$_;
+                 $$replyref{$key} = $value;
+             }
+         } else {
+             my $pathname = $perlvar{'lonDaemons'}.'/tmp';
+             foreach (@responses) {
+                 my ($key,$value) = split/=/,$_;
+                 $$replyref{$key} = $value;
+                 if ($value > 0) {
+                     foreach (@{$$affiliatesref{$key}}) {
+                         my $filename = $dom.'_'.$key.'_'.$_.'_classlist.xml';
+                         my $destname = $pathname.'/'.$filename;
+                         my $xml_classlist = &reply("autoretrieve:".$filename,$homeserver);
+                         if ($xml_classlist =~ /^error/) {
+                             &logthis('fetch_enrollment_query - autoretrieve error: '.$xml_classlist.' for '.$filename.' from server: '.$homeserver.' '.$context.' '.$cnum);
+                         } else {
+                             if ( open(FILE,">$destname") ) {
+                                 print FILE &unescape($xml_classlist);
+                                 close(FILE);
+                             } else {
+                                 &logthis('fetch_enrollment_query - error opening classlist file '.$destname.' '.$context.' '.$cnum);
+                             }
+                         }
+                     }
+                 }
+             }
+         }
+         return 'ok';
+     }
+     return 'error';
+ }
  sub get_query_reply {
      my $queryid=shift;
      my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
- Line 1850  sub get_query_reply {
+ Line 3387  sub get_query_reply {
      for (1..100) {
  	sleep 2;
          if (-e $replyfile.'.end') {
- 	    if (my $fh=Apache::File->new($replyfile)) {
+ 	    if (open(my $fh,$replyfile)) {
                 $reply.=<$fh>;
-                $fh->close;
+                close($fh);
  	   } else { return 'error: reply_file_error'; }
             return &unescape($reply);
  	}
- Line 1871  sub courselog_query {
+ Line 3408  sub courselog_query {
  # end: timestamp
  #
      my (%filters)=@_;
-     unless ($ENV{'request.course.id'}) { return 'no_course'; }
+     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 $cname=$env{'course.'.$env{'request.course.id'}.'.num'};
-     my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
+     my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
      return &log_query($cname,$cdom,'courselog',%filters);
  }
- Line 1887  sub userlog_query {
+ Line 3424  sub userlog_query {
      return &log_query($uname,$udom,'userlog',%filters);
  }
+ #--------- Call auto-enrollment subs in localenroll.pm for homeserver for course
+ sub auto_run {
+     my ($cnum,$cdom) = @_;
+     my $homeserver = &homeserver($cnum,$cdom);
+     my $response = &reply('autorun:'.$cdom,$homeserver);
+     return $response;
+ }
+ sub auto_get_sections {
+     my ($cnum,$cdom,$inst_coursecode) = @_;
+     my $homeserver = &homeserver($cnum,$cdom);
+     my @secs = ();
+     my $response=&unescape(&reply('autogetsections:'.$inst_coursecode.':'.$cdom,$homeserver));
+     unless ($response eq 'refused') {
+         @secs = split/:/,$response;
+     }
+     return @secs;
+ }
+ sub auto_new_course {
+     my ($cnum,$cdom,$inst_course_id,$owner) = @_;
+     my $homeserver = &homeserver($cnum,$cdom);
+     my $response=&unescape(&reply('autonewcourse:'.$inst_course_id.':'.$owner.':'.$cdom,$homeserver));
+     return $response;
+ }
+ sub auto_validate_courseID {
+     my ($cnum,$cdom,$inst_course_id) = @_;
+     my $homeserver = &homeserver($cnum,$cdom);
+     my $response=&unescape(&reply('autovalidatecourse:'.$inst_course_id.':'.$cdom,$homeserver));
+     return $response;
+ }
+ sub auto_create_password {
+     my ($cnum,$cdom,$authparam) = @_;
+     my $homeserver = &homeserver($cnum,$cdom);
+     my $create_passwd = 0;
+     my $authchk = '';
+     my $response=&unescape(&reply('autocreatepassword:'.$authparam.':'.$cdom,$homeserver));
+     if ($response eq 'refused') {
+         $authchk = 'refused';
+     } else {
+         ($authparam,$create_passwd,$authchk) = split/:/,$response;
+     }
+     return ($authparam,$create_passwd,$authchk);
+ }
+ sub auto_instcode_format {
+     my ($caller,$codedom,$instcodes,$codes,$codetitles,$cat_titles,$cat_order) = @_;
+     my $courses = '';
+     my $homeserver;
+     if ($caller eq 'global') {
+         foreach my $tryserver (keys %libserv) {
+             if ($hostdom{$tryserver} eq $codedom) {
+                 $homeserver = $tryserver;
+                 last;
+             }
+         }
+         if (($env{'user.name'}) && ($env{'user.domain'} eq $codedom)) {
+             $homeserver = &homeserver($env{'user.name'},$codedom);
+         }
+     } else {
+         $homeserver = &homeserver($caller,$codedom);
+     }
+     foreach (keys %{$instcodes}) {
+         $courses .= &escape($_).'='.&escape($$instcodes{$_}).'&';
+     }
+     chop($courses);
+     my $response=&reply('autoinstcodeformat:'.$codedom.':'.$courses,$homeserver);
+     unless ($response =~ /(con_lost|error|no_such_host|refused)/) {
+         my ($codes_str,$codetitles_str,$cat_titles_str,$cat_order_str) = split/:/,$response;
+         %{$codes} = &str2hash($codes_str);
+         @{$codetitles} = &str2array($codetitles_str);
+         %{$cat_titles} = &str2hash($cat_titles_str);
+         %{$cat_order} = &str2hash($cat_order_str);
+         return 'ok';
+     }
+     return $response;
+ }
  # ------------------------------------------------------------------ Plain Text
  sub plaintext {
      my $short=shift;
-     return $prp{$short};
+     return &mt($prp{$short});
  }
  # ----------------------------------------------------------------- Assign Role
  sub assignrole {
-     my ($udom,$uname,$url,$role,$end,$start)=@_;
+     my ($udom,$uname,$url,$role,$end,$start,$deleteflag)=@_;
      my $mrole;
      if ($role =~ /^cr\//) {
- 	unless (&allowed('ccr',$url)) {
+         my $cwosec=$url;
+         $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
+ 	unless (&allowed('ccr',$cwosec)) {
             &logthis('Refused custom assignrole: '.
               $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
- 		    $ENV{'user.name'}.' at '.$ENV{'user.domain'});
+ 		    $env{'user.name'}.' at '.$env{'user.domain'});
             return 'refused';
          }
          $mrole='cr';
      } else {
          my $cwosec=$url;
          $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
-         unless (&allowed('c'.$role,$cwosec)) {
+         unless ((&allowed('c'.$role,$cwosec)) || &allowed('c'.$role,$udom)) {
             &logthis('Refused assignrole: '.
               $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
- 		    $ENV{'user.name'}.' at '.$ENV{'user.domain'});
+ 		    $env{'user.name'}.' at '.$env{'user.domain'});
             return 'refused';
          }
          $mrole=$role;
      }
-     my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
+     my $command="encrypt:rolesput:$env{'user.domain'}:$env{'user.name'}:".
                  "$udom:$uname:$url".'_'."$mrole=$role";
      if ($end) { $command.='_'.$end; }
      if ($start) {
- Line 1928  sub assignrole {
+ Line 3548  sub assignrole {
             $command.='_0_'.$start;
          }
      }
-     return &reply($command,&homeserver($uname,$udom));
+ # actually delete
+     if ($deleteflag) {
+ 	if ((&allowed('dro',$udom)) || (&allowed('dro',$url))) {
+ # modify command to delete the role
+            $command="encrypt:rolesdel:$env{'user.domain'}:$env{'user.name'}:".
+                 "$udom:$uname:$url".'_'."$mrole";
+ 	   &logthis("$env{'user.name'} at $env{'user.domain'} deletes $mrole in $url for $uname at $udom");
+ # set start and finish to negative values for userrolelog
+            $start=-1;
+            $end=-1;
+         }
+     }
+ # send command
+     my $answer=&reply($command,&homeserver($uname,$udom));
+ # log new user role if status is ok
+     if ($answer eq 'ok') {
+ 	&userrolelog($mrole,$uname,$udom,$url,$start,$end);
+     }
+     return $answer;
  }
  # -------------------------------------------------- Modify user authentication
- Line 1939  sub modifyuserauth {
+ Line 3577  sub modifyuserauth {
      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'});
+              $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'},
+     &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'}.', '.
+         'Authentication changed by '.$env{'user.domain'}.', '.
-                                      $ENV{'user.name'}.', '.$umode.
+                                      $env{'user.name'}.', '.$umode.
           '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
      unless ($reply eq 'ok') {
          &logthis('Authentication mode error: '.$reply);
- Line 1962  sub modifyuser {
+ Line 3601  sub modifyuser {
      my ($udom,    $uname, $uid,
          $umode,   $upass, $first,
          $middle,  $last,  $gene,
-         $forceid, $desiredhome)=@_;
+         $forceid, $desiredhome, $email)=@_;
      $udom=~s/\W//g;
      $uname=~s/\W//g;
      &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
- Line 1970  sub modifyuser {
+ Line 3609  sub modifyuser {
  	     $last.', '.$gene.'(forceid: '.$forceid.')'.
               (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
                                       ' desiredhome not specified').
-              ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
+              ' 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)) {
+     if (($uhome eq 'no_host') &&
+ 	(($umode && $upass) || ($umode eq 'localauth'))) {
          my $unhome='';
          if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) {
              $unhome = $desiredhome;
- 	} elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
+ 	} elsif($env{'course.'.$env{'request.course.id'}.'.domain'} eq $udom) {
- 	    $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+ 	    $unhome=$env{'course.'.$env{'request.course.id'}.'.home'};
          } else { # load balancing routine for determining $unhome
              my $tryserver;
              my $loadm=10000000;
- Line 2003  sub modifyuser {
+ Line 3644  sub modifyuser {
          }
          $uhome=&homeserver($uname,$udom,'true');
          if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
- 	    return 'error: verify home';
+ 	    return 'error: unable verify users home machine.';
          }
      }   # End of creation of new user
  # ---------------------------------------------------------------------- Add ID
- Line 2013  sub modifyuser {
+ Line 3654  sub modifyuser {
         if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)
           && (!$forceid)) {
  	  unless ($uid eq $uidhash{$uname}) {
- 	      return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;
+ 	      return 'error: user id "'.$uid.'" does not match '.
+                   'current user id "'.$uidhash{$uname}.'".';
            }
         } else {
  	  &idput($udom,($uname => $uid));
         }
      }
  # -------------------------------------------------------------- Add names, etc
-     my %names=&get('environment',
+     my @tmp=&get('environment',
  		   ['firstname','middlename','lastname','generation'],
  		   $udom,$uname);
-     if ($names{'firstname'} =~ m/^error:.*/) { %names=(); }
+     my %names;
+     if ($tmp[0] =~ m/^error:.*/) {
+         %names=();
+     } else {
+         %names = @tmp;
+     }
+ #
+ # Make sure to not trash student environment if instructor does not bother
+ # to supply name and email information
+ #
      if ($first)  { $names{'firstname'}  = $first; }
-     if ($middle) { $names{'middlename'} = $middle; }
+     if (defined($middle)) { $names{'middlename'} = $middle; }
      if ($last)   { $names{'lastname'}   = $last; }
-     if ($gene)   { $names{'generation'} = $gene; }
+     if (defined($gene))   { $names{'generation'} = $gene; }
+     if ($email) {
+        $email=~s/[^\w\@\.\-\,]//gs;
+        if ($email=~/\@/) { $names{'notification'} = $email;
+ 			   $names{'critnotification'} = $email;
+ 			   $names{'permanentemail'} = $email; }
+     }
      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'});
+              $env{'user.name'}.' at '.$env{'user.domain'});
      return 'ok';
  }
- Line 2041  sub modifyuser {
+ Line 3698  sub modifyuser {
  sub modifystudent {
      my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
-         $end,$start,$forceid,$desiredhome)=@_;
+         $end,$start,$forceid,$desiredhome,$email,$type,$locktype,$cid)=@_;
-     my $cid='';
+     if (!$cid) {
-     unless ($cid=$ENV{'request.course.id'}) {
+ 	unless ($cid=$env{'request.course.id'}) {
- 	return 'not_in_class';
+ 	    return 'not_in_class';
+ 	}
      }
  # --------------------------------------------------------------- Make the user
      my $reply=&modifyuser
  	($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
-          $desiredhome);
+          $desiredhome,$email);
      unless ($reply eq 'ok') { return $reply; }
+     # This will cause &modify_student_enrollment to get the uid from the
+     # students environment
+     $uid = undef if (!$forceid);
+     $reply = &modify_student_enrollment($udom,$uname,$uid,$first,$middle,$last,
+ 					$gene,$usec,$end,$start,$type,$locktype,$cid);
+     return $reply;
+ }
+ sub modify_student_enrollment {
+     my ($udom,$uname,$uid,$first,$middle,$last,$gene,$usec,$end,$start,$type,$locktype,$cid) = @_;
+     my ($cdom,$cnum,$chome);
+     if (!$cid) {
+ 	unless ($cid=$env{'request.course.id'}) {
+ 	    return 'not_in_class';
+ 	}
+ 	$cdom=$env{'course.'.$cid.'.domain'};
+ 	$cnum=$env{'course.'.$cid.'.num'};
+     } else {
+ 	($cdom,$cnum)=split(/_/,$cid);
+     }
+     $chome=$env{'course.'.$cid.'.home'};
+     if (!$chome) {
+ 	$chome=&homeserver($cnum,$cdom);
+     }
+     if (!$chome) { return 'unknown_course'; }
+     # Make sure the user exists
      my $uhome=&homeserver($uname,$udom);
      if (($uhome eq '') || ($uhome eq 'no_host')) {
  	return 'error: no such user';
      }
- # -------------------------------------------------- Add student to course list
+     # Get student data if we were not given enough information
-     $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
+     if (!defined($first)  || $first  eq '' ||
- 	              $ENV{'course.'.$cid.'.num'}.':classlist:'.
+         !defined($last)   || $last   eq '' ||
-                       &escape($uname.':'.$udom).'='.
+         !defined($uid)    || $uid    eq '' ||
-                       &escape($end.':'.$start),
+         !defined($middle) || $middle eq '' ||
- 	              $ENV{'course.'.$cid.'.home'});
+         !defined($gene)   || $gene   eq '') {
+         # They did not supply us with enough data to enroll the student, so
+         # we need to pick up more information.
+         my %tmp = &get('environment',
+                        ['firstname','middlename','lastname', 'generation','id']
+                        ,$udom,$uname);
+         #foreach (keys(%tmp)) {
+         #    &logthis("key $_ = ".$tmp{$_});
+         #}
+         $first  = $tmp{'firstname'}  if (!defined($first)  || $first  eq '');
+         $middle = $tmp{'middlename'} if (!defined($middle) || $middle eq '');
+         $last   = $tmp{'lastname'}   if (!defined($last)   || $last eq '');
+         $gene   = $tmp{'generation'} if (!defined($gene)   || $gene eq '');
+         $uid    = $tmp{'id'}         if (!defined($uid)    || $uid  eq '');
+     }
+     my $fullname = &format_name($first,$middle,$last,$gene,'lastname');
+     my $reply=cput('classlist',
+ 		   {"$uname:$udom" =>
+ 			join(':',$end,$start,$uid,$usec,$fullname,$type,$locktype) },
+ 		   $cdom,$cnum);
      unless (($reply eq 'ok') || ($reply eq 'delayed')) {
  	return 'error: '.$reply;
      }
- # ---------------------------------------------------- Add student role to user
+     # Add student role to user
      my $uurl='/'.$cid;
      $uurl=~s/\_/\//g;
      if ($usec) {
- Line 2073  sub modifystudent {
+ Line 3777  sub modifystudent {
      return &assignrole($udom,$uname,$uurl,'st',$end,$start);
  }
+ sub format_name {
+     my ($firstname,$middlename,$lastname,$generation,$first)=@_;
+     my $name;
+     if ($first ne 'lastname') {
+ 	$name=$firstname.' '.$middlename.' '.$lastname.' '.$generation;
+     } else {
+ 	if ($lastname=~/\S/) {
+ 	    $name.= $lastname.' '.$generation.', '.$firstname.' '.$middlename;
+ 	    $name=~s/\s+,/,/;
+ 	} else {
+ 	    $name.= $firstname.' '.$middlename.' '.$generation;
+ 	}
+     }
+     $name=~s/^\s+//;
+     $name=~s/\s+$//;
+     $name=~s/\s+/ /g;
+     return $name;
+ }
  # ------------------------------------------------- Write to course preferences
  sub writecoursepref {
- Line 2095  sub writecoursepref {
+ Line 3818  sub writecoursepref {
  # ---------------------------------------------------------- Make/modify course
  sub createcourse {
-     my ($udom,$description,$url)=@_;
+     my ($udom,$description,$url,$course_server,$nonstandard,$inst_code,$course_owner)=@_;
      $url=&declutter($url);
      my $cid='';
-     unless (&allowed('ccc',$ENV{'user.domain'})) {
+     unless (&allowed('ccc',$udom)) {
-         return 'refused';
-     }
-     unless ($udom eq $ENV{'user.domain'}) {
          return 'refused';
      }
  # ------------------------------------------------------------------- Create ID
- Line 2117  sub createcourse {
+ Line 3837  sub createcourse {
             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::',
-                       $ENV{'user.home'});
+                       $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
+ # log existence
+     &courseidput($udom,&escape($udom.'_'.$uname).'='.&escape($description).
+                  ':'.&escape($inst_code).':'.&escape($course_owner),$uhome);
+     &flushcourselogs();
+ # set toplevel url
+     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,'initmap','default.sequence')
+                           );
+     }
+ # ----------------------------------------------------------- Write preferences
      &writecoursepref($udom.'_'.$uname,
                       ('description' => $description,
-                       'url'         => $url));
+                       'url'         => $topurl));
      return '/'.$udom.'/'.$uname;
  }
  # ---------------------------------------------------------- Assign Custom Role
  sub assigncustomrole {
-     my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;
+     my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start,$deleteflag)=@_;
      return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
-                        $end,$start);
+                        $end,$start,$deleteflag);
  }
  # ----------------------------------------------------------------- Revoke Role
  sub revokerole {
-     my ($udom,$uname,$url,$role)=@_;
+     my ($udom,$uname,$url,$role,$deleteflag)=@_;
      my $now=time;
-     return &assignrole($udom,$uname,$url,$role,$now);
+     return &assignrole($udom,$uname,$url,$role,$now,$deleteflag);
  }
  # ---------------------------------------------------------- Revoke Custom Role
  sub revokecustomrole {
-     my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;
+     my ($udom,$uname,$url,$rdom,$rnam,$rolename,$deleteflag)=@_;
      my $now=time;
-     return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);
+     return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now,
+            $deleteflag);
+ }
+ # ------------------------------------------------------------ Disk usage
+ sub diskusage {
+     my ($udom,$uname,$directoryRoot)=@_;
+     $directoryRoot =~ s/\/$//;
+     my $listing=&reply('du:'.$directoryRoot,homeserver($uname,$udom));
+     return $listing;
+ }
+ sub is_locked {
+     my ($file_name, $domain, $user) = @_;
+     my @check;
+     my $is_locked;
+     push @check, $file_name;
+     my %locked = &get('file_permissions',\@check,
+ 		      $env{'user.domain'},$env{'user.name'});
+     my ($tmp)=keys(%locked);
+     if ($tmp=~/^error:/) { undef(%locked); }
+     if (ref($locked{$file_name}) eq 'ARRAY') {
+         $is_locked = 'true';
+     } else {
+         $is_locked = 'false';
+     }
+ }
+ # ------------------------------------------------------------- Mark as Read Only
+ sub mark_as_readonly {
+     my ($domain,$user,$files,$what) = @_;
+     my %current_permissions = &dump('file_permissions',$domain,$user);
+     my ($tmp)=keys(%current_permissions);
+     if ($tmp=~/^error:/) { undef(%current_permissions); }
+     foreach my $file (@{$files}) {
+         push(@{$current_permissions{$file}},$what);
+     }
+     &put('file_permissions',\%current_permissions,$domain,$user);
+     return;
+ }
+ # ------------------------------------------------------------Save Selected Files
+ sub save_selected_files {
+     my ($user, $path, @files) = @_;
+     my $filename = $user."savedfiles";
+     my @other_files = &files_not_in_path($user, $path);
+     open (OUT, '>'.$Apache::lonnet::perlvar{'lonDaemons'}.'/tmp/'.$filename);
+     foreach my $file (@files) {
+         print (OUT $env{'form.currentpath'}.$file."\n");
+     }
+     foreach my $file (@other_files) {
+         print (OUT $file."\n");
+     }
+     close (OUT);
+     return 'ok';
+ }
+ sub clear_selected_files {
+     my ($user) = @_;
+     my $filename = $user."savedfiles";
+     open (OUT, '>'.$Apache::lonnet::perlvar{'lonDaemons'}.'/tmp/'.$filename);
+     print (OUT undef);
+     close (OUT);
+     return ("ok");
+ }
+ sub files_in_path {
+     my ($user, $path) = @_;
+     my $filename = $user."savedfiles";
+     my %return_files;
+     open (IN, '<'.$Apache::lonnet::perlvar{'lonDaemons'}.'/tmp/'.$filename);
+     while (my $line_in = <IN>) {
+         chomp ($line_in);
+         my @paths_and_file = split (m!/!, $line_in);
+         my $file_part = pop (@paths_and_file);
+         my $path_part = join ('/', @paths_and_file);
+         $path_part.='/';
+         my $path_and_file = $path_part.$file_part;
+         if ($path_part eq $path) {
+             $return_files{$file_part}= 'selected';
+         }
+     }
+     close (IN);
+     return (\%return_files);
+ }
+ # called in portfolio select mode, to show files selected NOT in current directory
+ sub files_not_in_path {
+     my ($user, $path) = @_;
+     my $filename = $user."savedfiles";
+     my @return_files;
+     my $path_part;
+     open (IN, '<'.$Apache::lonnet::perlvar{'lonDaemons'}.'/tmp/'.$filename);
+     while (<IN>) {
+         #ok, I know it's clunky, but I want it to work
+         my @paths_and_file = split m!/!, $_;
+         my $file_part = pop (@paths_and_file);
+         chomp ($file_part);
+         my $path_part = join ('/', @paths_and_file);
+         $path_part .= '/';
+         my $path_and_file = $path_part.$file_part;
+         if ($path_part ne $path) {
+             push (@return_files, ($path_and_file));
+         }
+     }
+     close (OUT);
+     return (@return_files);
+ }
+ #--------------------------------------------------------------Get Marked as Read Only
+ sub get_marked_as_readonly {
+     my ($domain,$user,$what) = @_;
+     my %current_permissions = &dump('file_permissions',$domain,$user);
+     my ($tmp)=keys(%current_permissions);
+     if ($tmp=~/^error:/) { undef(%current_permissions); }
+     my @readonly_files;
+     my $cmp1=$what;
+     if (ref($what)) { $cmp1=join('',@{$what}) };
+     while (my ($file_name,$value) = each(%current_permissions)) {
+         if (ref($value) eq "ARRAY"){
+             foreach my $stored_what (@{$value}) {
+                 my $cmp2=$stored_what;
+                 if (ref($stored_what)) { $cmp2=join('',@{$stored_what}) };
+                 if ($cmp1 eq $cmp2) {
+                     push(@readonly_files, $file_name);
+                 } elsif (!defined($what)) {
+                     push(@readonly_files, $file_name);
+                 }
+             }
+         }
+     }
+     return @readonly_files;
+ }
+ #-----------------------------------------------------------Get Marked as Read Only Hash
+ sub get_marked_as_readonly_hash {
+     my ($domain,$user,$what) = @_;
+     my %current_permissions = &dump('file_permissions',$domain,$user);
+     my ($tmp)=keys(%current_permissions);
+     if ($tmp=~/^error:/) { undef(%current_permissions); }
+     my %readonly_files;
+     while (my ($file_name,$value) = each(%current_permissions)) {
+         if (ref($value) eq "ARRAY"){
+             foreach my $stored_what (@{$value}) {
+                 if ($stored_what eq $what) {
+                     $readonly_files{$file_name} = 'locked';
+                 } elsif (!defined($what)) {
+                     $readonly_files{$file_name} = 'locked';
+                 }
+             }
+         }
+     }
+     return %readonly_files;
+ }
+ # ------------------------------------------------------------ Unmark as Read Only
+ sub unmark_as_readonly {
+     # unmarks $file_name (if $file_name is defined), or all files locked by $what
+     # for portfolio submissions, $what contains [$symb,$crsid]
+     my ($domain,$user,$what,$file_name) = @_;
+     my $symb_crs = $what;
+     if (ref($what)) { $symb_crs=join('',@$what); }
+     my %current_permissions = &dump('file_permissions',$domain,$user);
+     my ($tmp)=keys(%current_permissions);
+     if ($tmp=~/^error:/) { undef(%current_permissions); }
+     my @readonly_files = &get_marked_as_readonly($domain,$user,$what);
+     foreach my $file(@readonly_files){
+         my $current_locks = $current_permissions{$file};
+         my @new_locks;
+         my @del_keys;
+         if (ref($current_locks) eq "ARRAY"){
+             foreach my $locker (@{$current_locks}) {
+                 my $compare=$locker;
+                 if (ref($locker)) { $compare=join('',@{$locker}) };
+                 if ($compare eq $symb_crs) {
+                     if (defined($file_name) && ($file_name ne $file)) {
+                         push(@new_locks, $what);
+                     }
+                 } else {
+                     push(@new_locks, $what);
+                 }
+             }
+             if (@new_locks > 0) {
+                 $current_permissions{$file} = \@new_locks;
+             } else {
+                 push(@del_keys, $file);
+                 &del('file_permissions',\@del_keys, $domain, $user);
+                 delete $current_permissions{$file};
+             }
+         }
+     }
+     &put('file_permissions',\%current_permissions,$domain,$user);
+     return;
  }
  # ------------------------------------------------------------ Directory lister
  sub dirlist {
-     my $uri=shift;
+     my ($uri,$userdomain,$username,$alternateDirectoryRoot)=@_;
      $uri=~s/^\///;
      $uri=~s/\/$//;
-     my ($res,$udom,$uname,@rest)=split(/\//,$uri);
+     my ($udom, $uname);
-     if ($udom) {
+     (undef,$udom,$uname)=split(/\//,$uri);
-      if ($uname) {
+     if(defined($userdomain)) {
-        my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,
+         $udom = $userdomain;
-                       homeserver($uname,$udom));
+     }
-        return split(/:/,$listing);
+     if(defined($username)) {
-      } else {
+         $uname = $username;
-        my $tryserver;
+     }
-        my %allusers=();
-        foreach $tryserver (keys %libserv) {
+     my $dirRoot = $perlvar{'lonDocRoot'};
- 	  if ($hostdom{$tryserver} eq $udom) {
+     if(defined($alternateDirectoryRoot)) {
-              my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.$udom,
+         $dirRoot = $alternateDirectoryRoot;
- 			       $tryserver);
+         $dirRoot =~ s/\/$//;
-              if (($listing ne 'no_such_dir') && ($listing ne 'empty')
+     }
-               && ($listing ne 'con_lost')) {
-                 foreach (split(/:/,$listing)) {
+     if($udom) {
-                   my ($entry,@stat)=split(/&/,$_);
+         if($uname) {
-                   $allusers{$entry}=1;
+             my $listing=reply('ls2:'.$dirRoot.'/'.$uri,
+                               homeserver($uname,$udom));
+             my @listing_results;
+             if ($listing eq 'unknown_cmd') {
+                 $listing=reply('ls:'.$dirRoot.'/'.$uri,
+                                homeserver($uname,$udom));
+                 @listing_results = split(/:/,$listing);
+             } else {
+                 @listing_results = map { &unescape($_); } split(/:/,$listing);
+             }
+             return @listing_results;
+         } elsif(!defined($alternateDirectoryRoot)) {
+             my $tryserver;
+             my %allusers=();
+             foreach $tryserver (keys %libserv) {
+                 if($hostdom{$tryserver} eq $udom) {
+                     my $listing=reply('ls2:'.$perlvar{'lonDocRoot'}.'/res/'.
+                                       $udom, $tryserver);
+                     my @listing_results;
+                     if ($listing eq 'unknown_cmd') {
+                         $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.
+                                        $udom, $tryserver);
+                         @listing_results = split(/:/,$listing);
+                     } else {
+                         @listing_results =
+                             map { &unescape($_); } split(/:/,$listing);
+                     }
+                     if ($listing_results[0] ne 'no_such_dir' &&
+                         $listing_results[0] ne 'empty'       &&
+                         $listing_results[0] ne 'con_lost') {
+                         foreach (@listing_results) {
+                             my ($entry,@stat)=split(/&/,$_);
+                             $allusers{$entry}=1;
+                         }
+                     }
                  }
-              }
+             }
- 	  }
+             my $alluserstr='';
-        }
+             foreach (sort keys %allusers) {
-        my $alluserstr='';
+                 $alluserstr.=$_.'&user:';
-        foreach (sort keys %allusers) {
+             }
-            $alluserstr.=$_.'&user:';
+             $alluserstr=~s/:$//;
-        }
+             return split(/:/,$alluserstr);
-        $alluserstr=~s/:$//;
+         } else {
-        return split(/:/,$alluserstr);
+             my @emptyResults = ();
-      }
+             push(@emptyResults, 'missing user name');
-    } else {
+             return split(':',@emptyResults);
-        my $tryserver;
+         }
-        my %alldom=();
+     } elsif(!defined($alternateDirectoryRoot)) {
-        foreach $tryserver (keys %libserv) {
+         my $tryserver;
- 	   $alldom{$hostdom{$tryserver}}=1;
+         my %alldom=();
-        }
+         foreach $tryserver (keys %libserv) {
-        my $alldomstr='';
+             $alldom{$hostdom{$tryserver}}=1;
-        foreach (sort keys %alldom) {
+         }
-           $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
+         my $alldomstr='';
-        }
+         foreach (sort keys %alldom) {
-        $alldomstr=~s/:$//;
+             $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'/&domain:';
-        return split(/:/,$alldomstr);
+         }
-    }
+         $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
+ ##
+ ## FIXME: This subroutine assumes its caller knows something about the
+ ## directory structure of the home server for the student ($root).
+ ## Not a good assumption to make.  Since this is for looking up files
+ ## in user directories, the full path should be constructed by lond, not
+ ## whatever machine we request data from.
+ ##
+ 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 ($fileStat) = &Apache::lonnet::dirlist($proname, $studentDomain,
+                                               $studentName, $root);
+     my @stats = split('&', $fileStat);
+     if($stats[0] ne 'empty' && $stats[0] ne 'no_such_dir') {
+         # @stats contains first the filename, then the stat output
+         return $stats[10]; # so this is 10 instead of 9.
+     } else {
+         return -1;
+     }
  }
  # -------------------------------------------------------- Value of a Condition
  sub directcondval {
      my $number=shift;
-     if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
+     if (!defined($env{'user.state.'.$env{'request.course.id'}})) {
-        return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
+ 	&Apache::lonuserstate::evalstate();
+     }
+     if ($env{'user.state.'.$env{'request.course.id'}}) {
+        return substr($env{'user.state.'.$env{'request.course.id'}},$number,1);
      } else {
         return 2;
      }
- Line 2221  sub condval {
+ Line 4244  sub condval {
      my $result=0;
      my $allpathcond='';
      foreach (split(/\|/,$condidx)) {
-        if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
+        if (defined($env{'acc.cond.'.$env{'request.course.id'}.'.'.$_})) {
  	   $allpathcond.=
-                '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
+                '('.$env{'acc.cond.'.$env{'request.course.id'}.'.'.$_}.')|';
         }
      }
      $allpathcond=~s/\|$//;
-     if ($ENV{'request.course.id'}) {
+     if ($env{'request.course.id'}) {
         if ($allpathcond) {
            my $operand='|';
  	  my @stack;
- Line 2257  sub condval {
+ Line 4280  sub condval {
      return $result;
  }
+ # ---------------------------------------------------- Devalidate courseresdata
+ sub devalidatecourseresdata {
+     my ($coursenum,$coursedomain)=@_;
+     my $hashid=$coursenum.':'.$coursedomain;
+     &devalidate_cache_new('courseres',$hashid);
+ }
  # --------------------------------------------------- Course Resourcedata Query
- sub courseresdata {
+ sub get_courseresdata {
-     my ($coursenum,$coursedomain,@which)=@_;
+     my ($coursenum,$coursedomain)=@_;
      my $coursehom=&homeserver($coursenum,$coursedomain);
      my $hashid=$coursenum.':'.$coursedomain;
-     unless (defined($courseresdatacache{$hashid.'.time'})) {
+     my ($result,$cached)=&is_cached_new('courseres',$hashid);
- 	unless (time-$courseresdatacache{$hashid.'.time'}<300) {
+     my %dumpreply;
-            my $coursehom=&homeserver($coursenum,$coursedomain);
+     unless (defined($cached)) {
-            if ($coursehom) {
+ 	%dumpreply=&dump('resourcedata',$coursedomain,$coursenum);
-               my $dumpreply=&reply('dump:'.$coursedomain.':'.$coursenum.
+ 	$result=\%dumpreply;
- 			     ':resourcedata:.',$coursehom);
+ 	my ($tmp) = keys(%dumpreply);
- 	      unless ($dumpreply=~/^error\:/) {
+ 	if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
- 	         $courseresdatacache{$hashid.'.time'}=time;
+ 	    &do_cache_new('courseres',$hashid,$result,600);
-                  $courseresdatacache{$hashid}=$dumpreply;
+ 	} elsif ($tmp =~ /^(con_lost|no_such_host)/) {
- 	     }
+ 	    return $tmp;
- 	  }
+ 	} elsif ($tmp =~ /^(error)/) {
-        }
+ 	    $result=undef;
+ 	    &do_cache_new('courseres',$hashid,$result,600);
+ 	}
      }
-    my @pairs=split(/\&/,$courseresdatacache{$hashid});
+     return $result;
-    my %returnhash=();
-    foreach (@pairs) {
-       my ($key,$value)=split(/=/,$_);
-       $returnhash{unescape($key)}=unescape($value);
-    }
-     my $item;
-    foreach $item (@which) {
-        if ($returnhash{$item}) { return $returnhash{$item}; }
-    }
-    return '';
  }
- # --------------------------------------------------------- Value of a Variable
+ sub devalidateuserresdata {
+     my ($uname,$udom)=@_;
+     my $hashid="$udom:$uname";
+     &devalidate_cache_new('userres',$hashid);
+ }
+ sub get_userresdata {
+     my ($uname,$udom)=@_;
+     #most student don\'t have any data set, check if there is some data
+     if (&EXT_cache_status($udom,$uname)) { return undef; }
+     my $hashid="$udom:$uname";
+     my ($result,$cached)=&is_cached_new('userres',$hashid);
+     if (!defined($cached)) {
+ 	my %resourcedata=&dump('resourcedata',$udom,$uname);
+ 	$result=\%resourcedata;
+ 	&do_cache_new('userres',$hashid,$result,600);
+     }
+     my ($tmp)=keys(%$result);
+     if (($tmp!~/^error\:/) && ($tmp!~/^con_lost/)) {
+ 	return $result;
+     }
+     #error 2 occurs when the .db doesn't exist
+     if ($tmp!~/error: 2 /) {
+ 	&logthis("<font color=blue>WARNING:".
+ 		 " Trying to get resource data for ".
+ 		 $uname." at ".$udom.": ".
+ 		 $tmp."</font>");
+     } elsif ($tmp=~/error: 2 /) {
+ 	#&EXT_cache_set($udom,$uname);
+ 	&do_cache_new('userres',$hashid,undef,600);
+ 	undef($tmp); # not really an error so don't send it back
+     }
+     return $tmp;
+ }
+ sub resdata {
+     my ($name,$domain,$type,@which)=@_;
+     my $result;
+     if ($type eq 'course') {
+ 	$result=&get_courseresdata($name,$domain);
+     } elsif ($type eq 'user') {
+ 	$result=&get_userresdata($name,$domain);
+     }
+     if (!ref($result)) { return $result; }
+     foreach my $item (@which) {
+ 	if (defined($result->{$item})) {
+ 	    return $result->{$item};
+ 	}
+     }
+     return undef;
+ }
+ #
+ # EXT resource caching routines
+ #
+ sub clear_EXT_cache_status {
+     &delenv('cache.EXT.');
+ }
+ sub EXT_cache_status {
+     my ($target_domain,$target_user) = @_;
+     my $cachename = 'cache.EXT.'.$target_user.'.'.$target_domain;
+     if (exists($env{$cachename}) && ($env{$cachename}+600) > time) {
+         # We know already the user has no data
+         return 1;
+     } else {
+         return 0;
+     }
+ }
+ sub EXT_cache_set {
+     my ($target_domain,$target_user) = @_;
+     my $cachename = 'cache.EXT.'.$target_user.'.'.$target_domain;
+     #&appenv($cachename => time);
+ }
+ # --------------------------------------------------------- Value of a Variable
  sub EXT {
-     my ($varname,$symbparm,$udom,$uname)=@_;
+     my ($varname,$symbparm,$udom,$uname,$usection,$recurse)=@_;
      unless ($varname) { return ''; }
      #get real user name/domain, courseid and symb
      my $courseid;
+     my $publicuser;
+     if ($symbparm) {
+ 	$symbparm=&get_symb_from_alias($symbparm);
+     }
      if (!($uname && $udom)) {
-       (my $cursymb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
+       (my $cursymb,$courseid,$udom,$uname,$publicuser)=
+ 	  &Apache::lonxml::whichuser($symbparm);
        if (!$symbparm) {	$symbparm=$cursymb; }
      } else {
- 	$courseid=$ENV{'request.course.id'};
+ 	$courseid=$env{'request.course.id'};
      }
      my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
      my $rest;
-     if ($therest[0]) {
+     if (defined($therest[0])) {
         $rest=join('.',@therest);
      } else {
         $rest='';
      }
      my $qualifierrest=$qualifier;
      if ($rest) { $qualifierrest.='.'.$rest; }
      my $spacequalifierrest=$space;
- Line 2319  sub EXT {
+ Line 4423  sub EXT {
      if ($realm eq 'user') {
  # --------------------------------------------------------------- user.resource
  	if ($space eq 'resource') {
- 	    my %restored=&restore(undef,undef,$udom,$uname);
+ 	    if (defined($Apache::lonhomework::parsing_a_problem) ||
-             return $restored{$qualifierrest};
+ 		defined($Apache::lonhomework::parsing_a_task)) {
+ 		return $Apache::lonhomework::history{$qualifierrest};
+ 	    } else {
+ 		my %restored;
+ 		if ($publicuser || $env{'request.state'} eq 'construct') {
+ 		    %restored=&tmprestore($symbparm,$courseid,$udom,$uname);
+ 		} else {
+ 		    %restored=&restore($symbparm,$courseid,$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'}) &&
+ 	    if (($uname eq $env{'user.name'}) &&
- 		($udom eq $ENV{'user.domain'})) {
+ 		($udom eq $env{'user.domain'})) {
- 		return $ENV{join('.',('environment',$qualifierrest))};
+ 		return $env{join('.',('environment',$qualifierrest))};
  	    } else {
- 		my %returnhash=&userenvironment($udom,$uname,$qualifierrest);
+ 		my %returnhash;
+ 		if (!$publicuser) {
+ 		    %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))};
+             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'});
+             my ($role,$where)=split(/\./,$env{'request.role'});
              if ($qualifier eq 'value') {
  		return $role;
              } elsif ($qualifier eq 'extent') {
- Line 2355  sub EXT {
+ Line 4473  sub EXT {
              return $uname;
  # ---------------------------------------------------- Any other user namespace
          } else {
-             my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
+ 	    my %reply;
-             my %reply=&get($space,[$item]);
+ 	    if (!$publicuser) {
-             return $reply{$item};
+ 		%reply=&get($space,[$qualifierrest],$udom,$uname);
+ 	    }
+ 	    return $reply{$qualifierrest};
          }
      } elsif ($realm eq 'query') {
  # ---------------------------------------------- pull stuff out of query string
-         &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},[$space]);
+         &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
- 	return $ENV{'form.'.$space};
+ 						[$spacequalifierrest]);
+ 	return $env{'form.'.$spacequalifierrest};
     } elsif ($realm eq 'request') {
  # ------------------------------------------------------------- request.browser
          if ($space eq 'browser') {
- 	    return $ENV{'browser.'.$qualifier};
+ 	    if ($qualifier eq 'textremote') {
+ 		if (&mt('textual_remote_display') eq 'on') {
+ 		    return 1;
+ 		} else {
+ 		    return 0;
+ 		}
+ 	    } else {
+ 		return $env{'browser.'.$qualifier};
+ 	    }
  # ------------------------------------------------------------ request.filename
          } else {
-             return $ENV{'request.'.$spacequalifierrest};
+             return $env{'request.'.$spacequalifierrest};
          }
      } elsif ($realm eq 'course') {
  # ---------------------------------------------------------- course.description
-         return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
+         return $env{'course.'.$courseid.'.'.$spacequalifierrest};
      } elsif ($realm eq 'resource') {
- 	if ($courseid eq $ENV{'request.course.id'}) {
+ 	my $section;
+ 	if (defined($courseid) && $courseid eq $env{'request.course.id'}) {
+ 	    if (!$symbparm) { $symbparm=&symbread(); }
+ 	}
+ 	my ($courselevelm,$courselevel);
+ 	if ($symbparm && defined($courseid) &&
+ 	    $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 $mapp=(&decode_symb($symbp))[0];
  	    my $symbparm=$symbp.'.'.$spacequalifierrest;
  	    my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
- 	    my $section;
+ 	    if (($env{'user.name'} eq $uname) &&
- 	    if (($ENV{'user.name'} eq $uname) &&
+ 		($env{'user.domain'} eq $udom)) {
- 		($ENV{'user.domain'} eq $udom)) {
+ 		$section=$env{'request.course.sec'};
- 		$section={'request.course.sec'};
  	    } else {
- 		$section=&usection($udom,$uname,$courseid);
+ 		if (! defined($usection)) {
+ 		    $section=&getsection($udom,$uname,$courseid);
+ 		} else {
+ 		    $section = $usection;
+ 		}
  	    }
  	    my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
  	    my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
  	    my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
- 	    my $courselevel=$courseid.'.'.$spacequalifierrest;
+ 	    $courselevel=$courseid.'.'.$spacequalifierrest;
  	    my $courselevelr=$courseid.'.'.$symbparm;
- 	    my $courselevelm=$courseid.'.'.$mapparm;
+ 	    $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 $userreply=&resdata($uname,$udom,'user',
+ 				       ($courselevelr,$courselevelm,
- 	    my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
+ 					$courselevel));
- 					  $ENV{'course.'.$courseid.'.domain'},
- 					  ($seclevelr,$seclevelm,$seclevel,
+ 	    if (defined($userreply)) { return $userreply; }
- 					   $courselevelr,$courselevelm,
- 					   $courselevel));
+ # ------------------------------------------------ second, check some of course
- 	    if ($coursereply) { return $coursereply; }
+ 	    my $coursereply=&resdata($env{'course.'.$courseid.'.num'},
+ 				     $env{'course.'.$courseid.'.domain'},
+ 				     'course',
+ 				     ($seclevelr,$seclevelm,$seclevel,
+ 				      $courselevelr));
+ 	    if (defined($coursereply)) { return $coursereply; }
  # ------------------------------------------------------ third, check map parms
  	    my %parmhash=();
  	    my $thisparm='';
  	    if (tie(%parmhash,'GDBM_File',
- 		    $ENV{'request.course.fn'}.'_parms.db',
+ 		    $env{'request.course.fn'}.'_parms.db',
- 		    &GDBM_READER,0640)) {
+ 		    &GDBM_READER(),0640)) {
  		$thisparm=$parmhash{$symbparm};
  		untie(%parmhash);
  	    }
  	    if ($thisparm) { return $thisparm; }
  	}
- # --------------------------------------------- last, look in resource metadata
+ # ------------------------------------------ fourth, look in resource metadata
  	$spacequalifierrest=~s/\./\_/;
- 	my $metadata=&metadata($ENV{'request.filename'},$spacequalifierrest);
+ 	my $filename;
- 	if ($metadata) { return $metadata; }
+ 	if (!$symbparm) { $symbparm=&symbread(); }
- 	$metadata=&metadata($ENV{'request.filename'},
+ 	if ($symbparm) {
- 			    'parameter_'.$spacequalifierrest);
+ 	    $filename=(&decode_symb($symbparm))[2];
- 	if ($metadata) { return $metadata; }
+ 	} else {
+ 	    $filename=$env{'request.filename'};
+ 	}
+ 	my $metadata=&metadata($filename,$spacequalifierrest);
+ 	if (defined($metadata)) { return $metadata; }
+ 	$metadata=&metadata($filename,'parameter_'.$spacequalifierrest);
+ 	if (defined($metadata)) { return $metadata; }
+ # ---------------------------------------------- fourth, look in rest pf course
+ 	if ($symbparm && defined($courseid) &&
+ 	    $courseid eq $env{'request.course.id'}) {
+ 	    my $coursereply=&resdata($env{'course.'.$courseid.'.num'},
+ 				     $env{'course.'.$courseid.'.domain'},
+ 				     'course',
+ 				     ($courselevelm,$courselevel));
+ 	    if (defined($coursereply)) { return $coursereply; }
+ 	}
  # ------------------------------------------------------------------ Cascade up
  	unless ($space eq '0') {
- 	    my ($part,$id)=split(/\_/,$space);
+ 	    my @parts=split(/_/,$space);
- 	    if ($id) {
+ 	    my $id=pop(@parts);
- 		my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
+ 	    my $part=join('_',@parts);
- 				     $symbparm,$udom,$uname);
+ 	    if ($part eq '') { $part='0'; }
- 		if ($partgeneral) { return $partgeneral; }
+ 	    my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
- 	    } else {
+ 				 $symbparm,$udom,$uname,$section,1);
- 		my $resourcegeneral=&EXT('resource.0.'.$qualifierrest,
+ 	    if (defined($partgeneral)) { return $partgeneral; }
- 					 $symbparm,$udom,$uname);
- 		if ($resourcegeneral) { return $resourcegeneral; }
- 	    }
  	}
+ 	if ($recurse) { return undef; }
+ 	my $pack_def=&packages_tab_default($filename,$varname);
+ 	if (defined($pack_def)) { return $pack_def; }
  # ---------------------------------------------------- Any other user namespace
      } elsif ($realm eq 'environment') {
  # ----------------------------------------------------------------- environment
- 	if (($uname eq $ENV{'user.name'})&&($udom eq $ENV{'user.domain'})) {
+ 	if (($uname eq $env{'user.name'})&&($udom eq $env{'user.domain'})) {
- 	    return $ENV{'environment.'.$spacequalifierrest};
+ 	    return $env{'environment.'.$spacequalifierrest};
  	} else {
  	    my %returnhash=&userenvironment($udom,$uname,
  					    $spacequalifierrest);
- Line 2488  sub EXT {
+ Line 4626  sub EXT {
      return '';
  }
+ sub packages_tab_default {
+     my ($uri,$varname)=@_;
+     my (undef,$part,$name)=split(/\./,$varname);
+     my $packages=&metadata($uri,'packages');
+     foreach my $package (split(/,/,$packages)) {
+ 	my ($pack_type,$pack_part)=split(/_/,$package,2);
+ 	if (defined($packagetab{"$pack_type&$name&default"})) {
+ 	    return $packagetab{"$pack_type&$name&default"};
+ 	}
+ 	if ($pack_type eq 'part') { $pack_part='0'; }
+ 	if (defined($packagetab{$pack_type."_".$pack_part."&$name&default"})) {
+ 	    return $packagetab{$pack_type."_".$pack_part."&$name&default"};
+ 	}
+     }
+     return undef;
+ }
+ sub add_prefix_and_part {
+     my ($prefix,$part)=@_;
+     my $keyroot;
+     if (defined($prefix) && $prefix !~ /^__/) {
+ 	# prefix that has a part already
+ 	$keyroot=$prefix;
+     } elsif (defined($prefix)) {
+ 	# prefix that is missing a part
+ 	if (defined($part)) { $keyroot='_'.$part.substr($prefix,1); }
+     } else {
+ 	# no prefix at all
+ 	if (defined($part)) { $keyroot='_'.$part; }
+     }
+     return $keyroot;
+ }
  # ---------------------------------------------------------------- Get metadata
+ my %metaentry;
  sub metadata {
      my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
      $uri=&declutter($uri);
+     # if it is a non metadata possible uri return quickly
+     if (($uri eq '') ||
+ 	(($uri =~ m|^/*adm/|) &&
+ 	     ($uri !~ m|^adm/includes|) && ($uri !~ m|/bulletinboard$|)) ||
+         ($uri =~ m|/$|) || ($uri =~ m|/.meta$|) || ($uri =~ /^~/) ||
+ 	($uri =~ m|home/[^/]+/public_html/|)) {
+ 	return undef;
+     }
      my $filename=$uri;
      $uri=~s/\.meta$//;
  #
- Line 2501  sub metadata {
+ Line 4680  sub metadata {
  # Look at timestamp of caching
  # Everything is cached by the main uri, libraries are never directly cached
  #
-     unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600) {
+     if (!defined($liburi)) {
+ 	my ($result,$cached)=&is_cached_new('meta',$uri);
+ 	if (defined($cached)) { return $result->{':'.$what}; }
+     }
+     {
  #
  # Is this a recursive call for a library?
  #
+ #	if (! exists($metacache{$uri})) {
+ #	    $metacache{$uri}={};
+ #	}
          if ($liburi) {
  	    $liburi=&declutter($liburi);
              $filename=$liburi;
-         }
+         } else {
+ 	    &devalidate_cache_new('meta',$uri);
+ 	    undef(%metaentry);
+ 	}
          my %metathesekeys=();
          unless ($filename=~/\.meta$/) { $filename.='.meta'; }
- 	my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
+ 	my $metastring;
+ 	if ($uri !~ m -^(uploaded|editupload)/-) {
+ 	    my $file=&filelocation('',&clutter($filename));
+ 	    #push(@{$metaentry{$uri.'.file'}},$file);
+ 	    $metastring=&getfile($file);
+ 	}
          my $parser=HTML::LCParser->new(\$metastring);
          my $token;
          undef %metathesekeys;
          while ($token=$parser->get_token) {
-            if ($token->[0] eq 'S') {
+ 	    if ($token->[0] eq 'S') {
- 	     if (defined($token->[2]->{'package'})) {
+ 		if (defined($token->[2]->{'package'})) {
  #
  # This is a package - get package info
  #
- 	      my $package=$token->[2]->{'package'};
+ 		    my $package=$token->[2]->{'package'};
- 	      my $keyroot='';
+ 		    my $keyroot=&add_prefix_and_part($prefix,$token->[2]->{'part'});
-               if ($prefix) {
+ 		    if (defined($token->[2]->{'id'})) {
- 		  $keyroot.='_'.$prefix;
+ 			$keyroot.='_'.$token->[2]->{'id'};
-               } else {
+ 		    }
-                 if (defined($token->[2]->{'part'})) {
+ 		    if ($metaentry{':packages'}) {
-                    $keyroot.='_'.$token->[2]->{'part'};
+ 			$metaentry{':packages'}.=','.$package.$keyroot;
- 	        }
+ 		    } else {
- 	      }
+ 			$metaentry{':packages'}=$package.$keyroot;
-               if (defined($token->[2]->{'id'})) {
+ 		    }
-                  $keyroot.='_'.$token->[2]->{'id'};
+ 		    foreach (sort keys %packagetab) {
- 	      }
+ 			my $part=$keyroot;
-               if ($metacache{$uri.':packages'}) {
+ 			$part=~s/^\_//;
-                  $metacache{$uri.':packages'}.=','.$package.$keyroot;
+ 			if ($_=~/^\Q$package\E\&/ ||
-               } else {
+ 			    $_=~/^\Q$package\E_0\&/) {
-                  $metacache{$uri.':packages'}=$package.$keyroot;
+ 			    my ($pack,$name,$subp)=split(/\&/,$_);
- 	      }
+ 			    # ignore package.tab specified default values
-               foreach (keys %packagetab) {
+                             # here &package_tab_default() will fetch those
- 		  if ($_=~/^$package\&/) {
+ 			    if ($subp eq 'default') { next; }
- 		      my ($pack,$name,$subp)=split(/\&/,$_);
+ 			    my $value=$packagetab{$_};
-                       my $value=$packagetab{$_};
+ 			    my $unikey;
- 		      my $part=$keyroot;
+ 			    if ($pack =~ /_0$/) {
-                       $part=~s/^\_//;
+ 				$unikey='parameter_0_'.$name;
-                       if ($subp eq 'display') {
+ 				$part=0;
- 			  $value.=' [Part: '.$part.']';
+ 			    } else {
-                       }
+ 				$unikey='parameter'.$keyroot.'_'.$name;
-                       my $unikey='parameter'.$keyroot.'_'.$name;
+ 			    }
-                       $metathesekeys{$unikey}=1;
+ 			    if ($subp eq 'display') {
-                       $metacache{$uri.':'.$unikey.'.part'}=$part;
+ 				$value.=' [Part: '.$part.']';
-                       unless
+ 			    }
-                        (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
+ 			    $metaentry{':'.$unikey.'.part'}=$part;
-                          $metacache{$uri.':'.$unikey.'.'.$subp}=$value;
+ 			    $metathesekeys{$unikey}=1;
- 		      }
+ 			    unless (defined($metaentry{':'.$unikey.'.'.$subp})) {
-                   }
+ 				$metaentry{':'.$unikey.'.'.$subp}=$value;
-               }
+ 			    }
-              } else {
+ 			    if (defined($metaentry{':'.$unikey.'.default'})) {
+ 				$metaentry{':'.$unikey}=
+ 				    $metaentry{':'.$unikey.'.default'};
+ 			    }
+ 			}
+ 		    }
+ 		} else {
  #
  # This is not a package - some other kind of start tag
  #
-               my $entry=$token->[1];
+ 		    my $entry=$token->[1];
-               my $unikey;
+ 		    my $unikey;
-               if ($entry eq 'import') {
+ 		    if ($entry eq 'import') {
-                  $unikey='';
+ 			$unikey='';
-               } else {
+ 		    } else {
-                  $unikey=$entry;
+ 			$unikey=$entry;
- 	      }
+ 		    }
-               if ($prefix) {
+ 		    $unikey.=&add_prefix_and_part($prefix,$token->[2]->{'part'});
- 		  $unikey.=$prefix;
-               } else {
+ 		    if (defined($token->[2]->{'id'})) {
-                 if (defined($token->[2]->{'part'})) {
+ 			$unikey.='_'.$token->[2]->{'id'};
-                    $unikey.='_'.$token->[2]->{'part'};
+ 		    }
- 	        }
- 	      }
-               if (defined($token->[2]->{'id'})) {
-                  $unikey.='_'.$token->[2]->{'id'};
- 	      }
-              if ($entry eq 'import') {
+ 		    if ($entry eq 'import') {
  #
  # Importing a library here
  #
- 		 if (defined($depthcount)) { $depthcount++; } else
+ 			if ($depthcount<20) {
-                                            { $depthcount=0; }
+ 			    my $location=$parser->get_text('/import');
-                  if ($depthcount<20) {
+ 			    my $dir=$filename;
- 		     foreach (split(/\,/,&metadata($uri,'keys',
+ 			    $dir=~s|[^/]*$||;
-                                   $parser->get_text('/import'),$unikey,
+ 			    $location=&filelocation($dir,$location);
-                                   $depthcount))) {
+ 			    foreach (sort(split(/\,/,&metadata($uri,'keys',
-                          $metathesekeys{$_}=1;
+ 							       $location,$unikey,
- 		     }
+ 							       $depthcount+1)))) {
- 		 }
+ 				$metaentry{':'.$_}=$metaentry{':'.$_};
-              } else {
+ 				$metathesekeys{$_}=1;
+ 			    }
-               if (defined($token->[2]->{'name'})) {
+ 			}
-                  $unikey.='_'.$token->[2]->{'name'};
+ 		    } else {
- 	      }
-               $metathesekeys{$unikey}=1;
+ 			if (defined($token->[2]->{'name'})) {
-               foreach (@{$token->[3]}) {
+ 			    $unikey.='_'.$token->[2]->{'name'};
- 		  $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
+ 			}
-               }
+ 			$metathesekeys{$unikey}=1;
-               unless (
+ 			foreach (@{$token->[3]}) {
-                  $metacache{$uri.':'.$unikey}=&HTML::Entities::decode($parser->get_text('/'.$entry))
+ 			    $metaentry{':'.$unikey.'.'.$_}=$token->[2]->{$_};
- 		      ) { $metacache{$uri.':'.$unikey}=
+ 			}
- 			      $metacache{$uri.':'.$unikey.'.default'};
+ 			my $internaltext=&HTML::Entities::decode($parser->get_text('/'.$entry));
- 		      }
+ 			my $default=$metaentry{':'.$unikey.'.default'};
+ 			if ( $internaltext =~ /^\s*$/ && $default !~ /^\s*$/) {
+ 		 # only ws inside the tag, and not in default, so use default
+ 		 # as value
+ 			    $metaentry{':'.$unikey}=$default;
+ 			} else {
+ 		  # either something interesting inside the tag or default
+                   # uninteresting
+ 			    $metaentry{':'.$unikey}=$internaltext;
+ 			}
  # 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);
+ 	my ($extension) = ($uri =~ /\.(\w+)$/);
-        $metacache{$uri.':cachedtimestamp'}=time;
+ 	foreach my $key (sort(keys(%packagetab))) {
+ 	    #no specific packages #how's our extension
+ 	    if ($key!~/^extension_\Q$extension\E&/) { next; }
+ 	    &metadata_create_package_def($uri,$key,'extension_'.$extension,
+ 					 \%metathesekeys);
+ 	}
+ 	if (!exists($metaentry{':packages'})) {
+ 	    foreach my $key (sort(keys(%packagetab))) {
+ 		#no specific packages well let's get default then
+ 		if ($key!~/^default&/) { next; }
+ 		&metadata_create_package_def($uri,$key,'default',
+ 					     \%metathesekeys);
+ 	    }
+ 	}
+ # are there custom rights to evaluate
+ 	if ($metaentry{':copyright'} eq 'custom') {
+     #
+     # Importing a rights file here
+     #
+ 	    unless ($depthcount) {
+ 		my $location=$metaentry{':customdistributionfile'};
+ 		my $dir=$filename;
+ 		$dir=~s|[^/]*$||;
+ 		$location=&filelocation($dir,$location);
+ 		foreach (sort(split(/\,/,&metadata($uri,'keys',
+ 						   $location,'_rights',
+ 						   $depthcount+1)))) {
+ 		    #$metaentry{':'.$_}=$metacache{$uri}->{':'.$_};
+ 		    $metathesekeys{$_}=1;
+ 		}
+ 	    }
+ 	}
+ 	$metaentry{':keys'}=join(',',keys %metathesekeys);
+ 	&metadata_generate_part0(\%metathesekeys,\%metaentry,$uri);
+ 	$metaentry{':allpossiblekeys'}=join(',',keys %metathesekeys);
+ 	&do_cache_new('meta',$uri,\%metaentry,60*60*24);
  # this is the end of "was not already recently cached
      }
-     return $metacache{$uri.':'.$what};
+     return $metaentry{':'.$what};
  }
+ sub metadata_create_package_def {
+     my ($uri,$key,$package,$metathesekeys)=@_;
+     my ($pack,$name,$subp)=split(/\&/,$key);
+     if ($subp eq 'default') { next; }
+     if (defined($metaentry{':packages'})) {
+ 	$metaentry{':packages'}.=','.$package;
+     } else {
+ 	$metaentry{':packages'}=$package;
+     }
+     my $value=$packagetab{$key};
+     my $unikey;
+     $unikey='parameter_0_'.$name;
+     $metaentry{':'.$unikey.'.part'}=0;
+     $$metathesekeys{$unikey}=1;
+     unless (defined($metaentry{':'.$unikey.'.'.$subp})) {
+ 	$metaentry{':'.$unikey.'.'.$subp}=$value;
+     }
+     if (defined($metaentry{':'.$unikey.'.default'})) {
+ 	$metaentry{':'.$unikey}=
+ 	    $metaentry{':'.$unikey.'.default'};
+     }
+ }
+ sub metadata_generate_part0 {
+     my ($metadata,$metacache,$uri) = @_;
+     my %allnames;
+     foreach my $metakey (sort keys %$metadata) {
+ 	if ($metakey=~/^parameter\_(.*)/) {
+ 	  my $part=$$metacache{':'.$metakey.'.part'};
+ 	  my $name=$$metacache{':'.$metakey.'.name'};
+ 	  if (! exists($$metadata{'parameter_0_'.$name.'.name'})) {
+ 	    $allnames{$name}=$part;
+ 	  }
+ 	}
+     }
+     foreach my $name (keys(%allnames)) {
+       $$metadata{"parameter_0_$name"}=1;
+       my $key=":parameter_0_$name";
+       $$metacache{"$key.part"}='0';
+       $$metacache{"$key.name"}=$name;
+       $$metacache{"$key.type"}=$$metacache{':parameter_'.
+ 					   $allnames{$name}.'_'.$name.
+ 					   '.type'};
+       my $olddis=$$metacache{':parameter_'.$allnames{$name}.'_'.$name.
+ 			     '.display'};
+       my $expr='[Part: '.$allnames{$name}.']';
+       $olddis=~s/\Q$expr\E/\[Part: 0\]/;
+       $$metacache{"$key.display"}=$olddis;
+     }
+ }
+ # ------------------------------------------------- Get the title of a resource
+ sub gettitle {
+     my $urlsymb=shift;
+     my $symb=&symbread($urlsymb);
+     if ($symb) {
+ 	my $key=$env{'request.course.id'}."\0".$symb;
+ 	my ($result,$cached)=&is_cached_new('title',$key);
+ 	if (defined($cached)) {
+ 	    return $result;
+ 	}
+ 	my ($map,$resid,$url)=&decode_symb($symb);
+ 	my $title='';
+ 	my %bighash;
+ 	if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
+ 		&GDBM_READER(),0640)) {
+ 	    my $mapid=$bighash{'map_pc_'.&clutter($map)};
+ 	    $title=$bighash{'title_'.$mapid.'.'.$resid};
+ 	    untie %bighash;
+ 	}
+ 	$title=~s/\&colon\;/\:/gs;
+ 	if ($title) {
+ 	    return &do_cache_new('title',$key,$title,600);
+ 	}
+ 	$urlsymb=$url;
+     }
+     my $title=&metadata($urlsymb,'title');
+     if (!$title) { $title=(split('/',$urlsymb))[-1]; }
+     return $title;
+ }
+ sub get_slot {
+     my ($which,$cnum,$cdom)=@_;
+     if (!$cnum || !$cdom) {
+ 	(undef,my $courseid)=&Apache::lonxml::whichuser();
+ 	$cdom=$env{'course.'.$courseid.'.domain'};
+ 	$cnum=$env{'course.'.$courseid.'.num'};
+     }
+     my %slotinfo=&get('slots',[$which],$cdom,$cnum);
+     &Apache::lonhomework::showhash(%slotinfo);
+     my ($tmp)=keys(%slotinfo);
+     if ($tmp=~/^error:/) { return (); }
+     if (ref($slotinfo{$which}) eq 'HASH') {
+ 	return %{$slotinfo{$which}};
+     }
+     return $slotinfo{$which};
+ }
  # ------------------------------------------------- Update symbolic store links
  sub symblist {
      my ($mapname,%newhash)=@_;
-     $mapname=declutter($mapname);
+     $mapname=&deversion(&declutter($mapname));
      my %hash;
-     if (($ENV{'request.course.fn'}) && (%newhash)) {
+     if (($env{'request.course.fn'}) && (%newhash)) {
-         if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
+         if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
-                       &GDBM_WRCREAT,0640)) {
+                       &GDBM_WRCREAT(),0640)) {
  	    foreach (keys %newhash) {
-                 $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
+                 $hash{declutter($_)}=&encode_symb($mapname,$newhash{$_}->[1],
+ 						  $newhash{$_}->[0]);
              }
              if (untie(%hash)) {
  		return 'ok';
- Line 2642  sub symblist {
+ Line 4982  sub symblist {
  # --------------------------------------------------------------- Verify a symb
  sub symbverify {
-     my ($symb,$thisfn)=@_;
+     my ($symb,$thisurl)=@_;
+     my $thisfn=$thisurl;
+ # wrapper not part of symbs
+     $thisfn=~s/^\/adm\/wrapper//;
      $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);
+     my ($map,$resid,$url)=&decode_symb($symb);
-     unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
+     unless ($url eq $thisfn) { return 0; }
      $symb=&symbclean($symb);
+     $thisurl=&deversion($thisurl);
+     $thisfn=&deversion($thisfn);
      my %bighash;
      my $okay=0;
-     if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
-                             &GDBM_READER,0640)) {
+     if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
-         my $ids=$bighash{'ids_/res/'.$thisfn};
+                             &GDBM_READER(),0640)) {
+         my $ids=$bighash{'ids_'.&clutter($thisurl)};
          unless ($ids) {
-            $ids=$bighash{'ids_/'.$thisfn};
+            $ids=$bighash{'ids_/'.$thisurl};
          }
          if ($ids) {
  # ------------------------------------------------------------------- Has ID(s)
  	    foreach (split(/\,/,$ids)) {
-                my ($mapid,$resid)=split(/\./,$_);
+ 	       my ($mapid,$resid)=split(/\./,$_);
                 if (
    &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
     eq $symb) {
-                   $okay=1;
+ 		   if (($env{'request.role.adv'}) ||
-                }
+ 		       $bighash{'encrypted_'.$_} eq $env{'request.enc'}) {
+ 		       $okay=1;
+ 		   }
+ 	       }
  	   }
          }
  	untie(%bighash);
- Line 2680  sub symbverify {
+ Line 5030  sub symbverify {
  sub symbclean {
      my $symb=shift;
+     if ($symb=~m|^/enc/|) { $symb=&Apache::lonenc::unencrypted($symb); }
  # remove version from map
      $symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
  # remove version from URL
      $symb=~s/\.(\d+)\.(\w+)$/\.$2/;
+ # remove wrapper
+     $symb=~s/(\_\_\_\d+\_\_\_)adm\/wrapper\/(res\/)*/$1/;
      return $symb;
  }
+ # ---------------------------------------------- Split symb to find map and url
+ sub encode_symb {
+     my ($map,$resid,$url)=@_;
+     return &symbclean(&declutter($map).'___'.$resid.'___'.&declutter($url));
+ }
+ sub decode_symb {
+     my $symb=shift;
+     if ($symb=~m|^/enc/|) { $symb=&Apache::lonenc::unencrypted($symb); }
+     my ($map,$resid,$url)=split(/___/,$symb);
+     return (&fixversion($map),$resid,&fixversion($url));
+ }
+ sub fixversion {
+     my $fn=shift;
+     if ($fn=~/^(adm|uploaded|editupload|public)/) { return $fn; }
+     my %bighash;
+     my $uri=&clutter($fn);
+     my $key=$env{'request.course.id'}.'_'.$uri;
+ # is this cached?
+     my ($result,$cached)=&is_cached_new('courseresversion',$key);
+     if (defined($cached)) { return $result; }
+ # unfortunately not cached, or expired
+     if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
+ 	    &GDBM_READER(),0640)) {
+  	if ($bighash{'version_'.$uri}) {
+  	    my $version=$bighash{'version_'.$uri};
+  	    unless (($version eq 'mostrecent') ||
+ 		    ($version==&getversion($uri))) {
+  		$uri=~s/\.(\w+)$/\.$version\.$1/;
+  	    }
+  	}
+  	untie %bighash;
+     }
+     return &do_cache_new('courseresversion',$key,&declutter($uri),600);
+ }
+ sub deversion {
+     my $url=shift;
+     $url=~s/\.\d+\.(\w+)$/\.$1/;
+     return $url;
+ }
  # ------------------------------------------------------ Return symb list entry
  sub symbread {
-     my $thisfn=shift;
+     my ($thisfn,$donotrecurse)=@_;
+     my $cache_str='request.symbread.cached.'.$thisfn;
+     if (defined($env{$cache_str})) { return $env{$cache_str}; }
  # no filename provided? try from environment
      unless ($thisfn) {
-         if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
+         if ($env{'request.symb'}) {
- 	$thisfn=$ENV{'request.filename'};
+ 	    return $env{$cache_str}=&symbclean($env{'request.symb'});
+ 	}
+ 	$thisfn=$env{'request.filename'};
      }
+     if ($thisfn=~m|^/enc/|) { $thisfn=&Apache::lonenc::unencrypted($thisfn); }
  # is that filename actually a symb? Verify, clean, and return
      if ($thisfn=~/\_\_\_\d+\_\_\_(.*)$/) {
- 	if (&symbverify($thisfn,$1)) { return &symbclean($thisfn); }
+ 	if (&symbverify($thisfn,$1)) {
+ 	    return $env{$cache_str}=&symbclean($thisfn);
+ 	}
      }
      $thisfn=declutter($thisfn);
      my %hash;
      my %bighash;
      my $syval='';
-     if (($ENV{'request.course.fn'}) && ($thisfn)) {
+     if (($env{'request.course.fn'}) && ($thisfn)) {
-         if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
+         my $targetfn = $thisfn;
-                       &GDBM_READER,0640)) {
+         if ( ($thisfn =~ m/^(uploaded|editupload)\//) && ($thisfn !~ m/\.(page|sequence)$/) ) {
- 	    $syval=$hash{$thisfn};
+             $targetfn = 'adm/wrapper/'.$thisfn;
+         }
+         if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
+                       &GDBM_READER(),0640)) {
+ 	    $syval=$hash{$targetfn};
              untie(%hash);
          }
  # ---------------------------------------------------------- There was an entry
          if ($syval) {
-            unless ($syval=~/\_\d+$/) {
+ 	    #unless ($syval=~/\_\d+$/) {
- 	       unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
+ 		#unless ($env{'form.request.prefix'}=~/\.(\d+)\_$/) {
-                   &appenv('request.ambiguous' => $thisfn);
+ 		    #&appenv('request.ambiguous' => $thisfn);
-                   return '';
+ 		    #return $env{$cache_str}='';
-                }
+ 		#}
-                $syval.=$1;
+ 		#$syval.=$1;
- 	   }
+ 	    #}
          } else {
  # ------------------------------------------------------- Was not in symb table
-            if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
+            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};
                }
- Line 2741  sub symbread {
+ Line 5149  sub symbread {
                   if ($#possibilities==0) {
  # ----------------------------------------------- There is only one possibility
  		     my ($mapid,$resid)=split(/\./,$ids);
-                      $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
+ 		     $syval=&encode_symb($bighash{'map_id_'.$mapid},
-                  } else {
+ 						    $resid,$thisfn);
+                  } elsif (!$donotrecurse) {
  # ------------------------------------------ There is more than one possibility
                       my $realpossible=0;
                       foreach (@possibilities) {
- Line 2751  sub symbread {
+ Line 5160  sub symbread {
           		    my ($mapid,$resid)=split(/\./,$_);
                              if ($bighash{'map_type_'.$mapid} ne 'page') {
  				$realpossible++;
-                                 $syval=declutter($bighash{'map_id_'.$mapid}).
+                                 $syval=&encode_symb($bighash{'map_id_'.$mapid},
-                                        '___'.$resid;
+ 						    $resid,$thisfn);
                              }
  			 }
                       }
  		     if ($realpossible!=1) { $syval=''; }
+                  } else {
+                      $syval='';
                   }
  	      }
                untie(%bighash)
             }
          }
          if ($syval) {
-            return &symbclean($syval.'___'.$thisfn);
+ 	    return $env{$cache_str}=$syval;
          }
      }
      &appenv('request.ambiguous' => $thisfn);
-     return '';
+     return $env{$cache_str}='';
  }
  # ---------------------------------------------------------- Return random seed
- Line 2781  sub numval {
+ Line 5192  sub numval {
      $txt=~tr/U-Z/0-5/;
      $txt=~tr/u-z/0-5/;
      $txt=~s/\D//g;
+     if ($_64bit) { if ($txt > 2**32) { return -1; } }
      return int($txt);
  }
+ sub numval2 {
+     my $txt=shift;
+     $txt=~tr/A-J/0-9/;
+     $txt=~tr/a-j/0-9/;
+     $txt=~tr/K-T/0-9/;
+     $txt=~tr/k-t/0-9/;
+     $txt=~tr/U-Z/0-5/;
+     $txt=~tr/u-z/0-5/;
+     $txt=~s/\D//g;
+     my @txts=split(/(\d\d\d\d\d\d\d\d\d)/,$txt);
+     my $total;
+     foreach my $val (@txts) { $total+=$val; }
+     if ($_64bit) { if ($total > 2**32) { return -1; } }
+     return int($total);
+ }
+ sub numval3 {
+     use integer;
+     my $txt=shift;
+     $txt=~tr/A-J/0-9/;
+     $txt=~tr/a-j/0-9/;
+     $txt=~tr/K-T/0-9/;
+     $txt=~tr/k-t/0-9/;
+     $txt=~tr/U-Z/0-5/;
+     $txt=~tr/u-z/0-5/;
+     $txt=~s/\D//g;
+     my @txts=split(/(\d\d\d\d\d\d\d\d\d)/,$txt);
+     my $total;
+     foreach my $val (@txts) { $total+=$val; }
+     if ($_64bit) { $total=(($total<<32)>>32); }
+     return $total;
+ }
+ sub latest_rnd_algorithm_id {
+     return '64bit4';
+ }
+ sub get_rand_alg {
+     my ($courseid)=@_;
+     if (!$courseid) { $courseid=(&Apache::lonxml::whichuser())[1]; }
+     if ($courseid) {
+ 	return $env{"course.$courseid.rndseed"};
+     }
+     return &latest_rnd_algorithm_id();
+ }
+ sub validCODE {
+     my ($CODE)=@_;
+     if (defined($CODE) && $CODE ne '' && $CODE =~ /^\w+$/) { return 1; }
+     return 0;
+ }
+ sub getCODE {
+     if (&validCODE($env{'form.CODE'})) { return $env{'form.CODE'}; }
+     if ( (defined($Apache::lonhomework::parsing_a_problem) ||
+ 	  defined($Apache::lonhomework::parsing_a_task) ) &&
+ 	 &validCODE($Apache::lonhomework::history{'resource.CODE'})) {
+ 	return $Apache::lonhomework::history{'resource.CODE'};
+     }
+     return undef;
+ }
  sub rndseed {
      my ($symb,$courseid,$domain,$username)=@_;
+     my ($wsymb,$wcourseid,$wdomain,$wusername)=&Apache::lonxml::whichuser();
      if (!$symb) {
-       unless ($symb=&symbread()) { return time; }
+ 	unless ($symb=$wsymb) { return time; }
+     }
+     if (!$courseid) { $courseid=$wcourseid; }
+     if (!$domain) { $domain=$wdomain; }
+     if (!$username) { $username=$wusername }
+     my $which=&get_rand_alg();
+     if (defined(&getCODE())) {
+ 	if ($which eq '64bit4') {
+ 	    return &rndseed_CODE_64bit4($symb,$courseid,$domain,$username);
+ 	} else {
+ 	    return &rndseed_CODE_64bit($symb,$courseid,$domain,$username);
+ 	}
+     } elsif ($which eq '64bit4') {
+ 	return &rndseed_64bit4($symb,$courseid,$domain,$username);
+     } elsif ($which eq '64bit3') {
+ 	return &rndseed_64bit3($symb,$courseid,$domain,$username);
+     } elsif ($which eq '64bit2') {
+ 	return &rndseed_64bit2($symb,$courseid,$domain,$username);
+     } elsif ($which eq '64bit') {
+ 	return &rndseed_64bit($symb,$courseid,$domain,$username);
+     }
+     return &rndseed_32bit($symb,$courseid,$domain,$username);
+ }
+ sub rndseed_32bit {
+     my ($symb,$courseid,$domain,$username)=@_;
+     {
+ 	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;
+ 	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+ 	#&Apache::lonxml::debug("rndseed :$num:$symb");
+ 	if ($_64bit) { $num=(($num<<32)>>32); }
+ 	return $num;
      }
-     if (!$courseid) { $courseid=$ENV{'request.course.id'};}
+ }
-     if (!$domain) {$domain=$ENV{'user.domain'};}
-     if (!$username) {$username=$ENV{'user.name'};}
+ sub rndseed_64bit {
+     my ($symb,$courseid,$domain,$username)=@_;
      {
-       use integer;
+ 	use integer;
-       my $symbchck=unpack("%32C*",$symb) << 27;
+ 	my $symbchck=unpack("%32S*",$symb) << 21;
-       my $symbseed=numval($symb) << 22;
+ 	my $symbseed=numval($symb) << 10;
-       my $namechck=unpack("%32C*",$username) << 17;
+ 	my $namechck=unpack("%32S*",$username);
-       my $nameseed=numval($username) << 12;
-       my $domainseed=unpack("%32C*",$domain) << 7;
+ 	my $nameseed=numval($username) << 21;
-       my $courseseed=unpack("%32C*",$courseid);
+ 	my $domainseed=unpack("%32S*",$domain) << 10;
-       my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
+ 	my $courseseed=unpack("%32S*",$courseid);
-       #uncommenting these lines can break things!
-       #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+ 	my $num1=$symbchck+$symbseed+$namechck;
-       #&Apache::lonxml::debug("rndseed :$num:$symb");
+ 	my $num2=$nameseed+$domainseed+$courseseed;
-       return $num;
+ 	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+ 	#&Apache::lonxml::debug("rndseed :$num:$symb");
+ 	if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
+ 	if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
+ 	return "$num1,$num2";
      }
  }
+ sub rndseed_64bit2 {
+     my ($symb,$courseid,$domain,$username)=@_;
+     {
+ 	use integer;
+ 	# strings need to be an even # of cahracters long, it it is odd the
+         # last characters gets thrown away
+ 	my $symbchck=unpack("%32S*",$symb.' ') << 21;
+ 	my $symbseed=numval($symb) << 10;
+ 	my $namechck=unpack("%32S*",$username.' ');
+ 	my $nameseed=numval($username) << 21;
+ 	my $domainseed=unpack("%32S*",$domain.' ') << 10;
+ 	my $courseseed=unpack("%32S*",$courseid.' ');
+ 	my $num1=$symbchck+$symbseed+$namechck;
+ 	my $num2=$nameseed+$domainseed+$courseseed;
+ 	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+ 	#&Apache::lonxml::debug("rndseed :$num:$symb");
+ 	return "$num1,$num2";
+     }
+ }
+ sub rndseed_64bit3 {
+     my ($symb,$courseid,$domain,$username)=@_;
+     {
+ 	use integer;
+ 	# strings need to be an even # of cahracters long, it it is odd the
+         # last characters gets thrown away
+ 	my $symbchck=unpack("%32S*",$symb.' ') << 21;
+ 	my $symbseed=numval2($symb) << 10;
+ 	my $namechck=unpack("%32S*",$username.' ');
+ 	my $nameseed=numval2($username) << 21;
+ 	my $domainseed=unpack("%32S*",$domain.' ') << 10;
+ 	my $courseseed=unpack("%32S*",$courseid.' ');
+ 	my $num1=$symbchck+$symbseed+$namechck;
+ 	my $num2=$nameseed+$domainseed+$courseseed;
+ 	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+ 	#&Apache::lonxml::debug("rndseed :$num1:$num2:$_64bit");
+ 	if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
+ 	return "$num1:$num2";
+     }
+ }
+ sub rndseed_64bit4 {
+     my ($symb,$courseid,$domain,$username)=@_;
+     {
+ 	use integer;
+ 	# strings need to be an even # of cahracters long, it it is odd the
+         # last characters gets thrown away
+ 	my $symbchck=unpack("%32S*",$symb.' ') << 21;
+ 	my $symbseed=numval3($symb) << 10;
+ 	my $namechck=unpack("%32S*",$username.' ');
+ 	my $nameseed=numval3($username) << 21;
+ 	my $domainseed=unpack("%32S*",$domain.' ') << 10;
+ 	my $courseseed=unpack("%32S*",$courseid.' ');
+ 	my $num1=$symbchck+$symbseed+$namechck;
+ 	my $num2=$nameseed+$domainseed+$courseseed;
+ 	#&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+ 	#&Apache::lonxml::debug("rndseed :$num1:$num2:$_64bit");
+ 	if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
+ 	return "$num1:$num2";
+     }
+ }
+ sub rndseed_CODE_64bit {
+     my ($symb,$courseid,$domain,$username)=@_;
+     {
+ 	use integer;
+ 	my $symbchck=unpack("%32S*",$symb.' ') << 16;
+ 	my $symbseed=numval2($symb);
+ 	my $CODEchck=unpack("%32S*",&getCODE().' ') << 16;
+ 	my $CODEseed=numval(&getCODE());
+ 	my $courseseed=unpack("%32S*",$courseid.' ');
+ 	my $num1=$symbseed+$CODEchck;
+ 	my $num2=$CODEseed+$courseseed+$symbchck;
+ 	#&Apache::lonxml::debug("$symbseed:$CODEchck|$CODEseed:$courseseed:$symbchck");
+ 	#&Apache::lonxml::debug("rndseed :$num1:$num2:$symb");
+ 	if ($_64bit) { $num1=(($num1<<32)>>32); }
+ 	if ($_64bit) { $num2=(($num2<<32)>>32); }
+ 	return "$num1:$num2";
+     }
+ }
+ sub rndseed_CODE_64bit4 {
+     my ($symb,$courseid,$domain,$username)=@_;
+     {
+ 	use integer;
+ 	my $symbchck=unpack("%32S*",$symb.' ') << 16;
+ 	my $symbseed=numval3($symb);
+ 	my $CODEchck=unpack("%32S*",&getCODE().' ') << 16;
+ 	my $CODEseed=numval3(&getCODE());
+ 	my $courseseed=unpack("%32S*",$courseid.' ');
+ 	my $num1=$symbseed+$CODEchck;
+ 	my $num2=$CODEseed+$courseseed+$symbchck;
+ 	#&Apache::lonxml::debug("$symbseed:$CODEchck|$CODEseed:$courseseed:$symbchck");
+ 	#&Apache::lonxml::debug("rndseed :$num1:$num2:$symb");
+ 	if ($_64bit) { $num1=(($num1<<32)>>32); }
+ 	if ($_64bit) { $num2=(($num2<<32)>>32); }
+ 	return "$num1:$num2";
+     }
+ }
+ sub setup_random_from_rndseed {
+     my ($rndseed)=@_;
+     if ($rndseed =~/([,:])/) {
+ 	my ($num1,$num2)=split(/[,:]/,$rndseed);
+ 	&Math::Random::random_set_seed(abs($num1),abs($num2));
+     } else {
+ 	&Math::Random::random_set_seed_from_phrase($rndseed);
+     }
+ }
+ sub latest_receipt_algorithm_id {
+     return 'receipt2';
+ }
+ sub recunique {
+     my $fucourseid=shift;
+     my $unique;
+     if ($env{"course.$fucourseid.receiptalg"} eq 'receipt2') {
+ 	$unique=$env{"course.$fucourseid.internal.encseed"};
+     } else {
+ 	$unique=$perlvar{'lonReceipt'};
+     }
+     return unpack("%32C*",$unique);
+ }
+ sub recprefix {
+     my $fucourseid=shift;
+     my $prefix;
+     if ($env{"course.$fucourseid.receiptalg"} eq 'receipt2') {
+ 	$prefix=$env{"course.$fucourseid.internal.encpref"};
+     } else {
+ 	$prefix=$perlvar{'lonHostID'};
+     }
+     return unpack("%32C*",$prefix);
+ }
  sub ireceipt {
-     my ($funame,$fudom,$fucourseid,$fusymb)=@_;
+     my ($funame,$fudom,$fucourseid,$fusymb,$part)=@_;
      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'});
+     my $cunique=&recunique($fucourseid);
-     return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
+     my $cpart=unpack("%32S*",$part);
-            ($cunique%$cuname+
+     my $return =&recprefix($fucourseid).'-';
-             $cunique%$cudom+
+     if ($env{"course.$fucourseid.receiptalg"} eq 'receipt2' ||
-             $cusymb%$cuname+
+ 	$env{'request.state'} eq 'construct') {
-             $cusymb%$cudom+
+ 	&Apache::lonxml::debug("doing receipt2  using parts $cpart, uname $cuname and udom $cudom gets  ".($cpart%$cuname).
-             $cucourseid%$cuname+
+ 			       " and ".($cpart%$cudom));
-             $cucourseid%$cudom);
+ 	$return.= ($cunique%$cuname+
+ 		   $cunique%$cudom+
+ 		   $cusymb%$cuname+
+ 		   $cusymb%$cudom+
+ 		   $cucourseid%$cuname+
+ 		   $cucourseid%$cudom+
+ 		   $cpart%$cuname+
+ 		   $cpart%$cudom);
+     } else {
+ 	$return.= ($cunique%$cuname+
+ 		   $cunique%$cudom+
+ 		   $cusymb%$cuname+
+ 		   $cusymb%$cudom+
+ 		   $cucourseid%$cuname+
+ 		   $cucourseid%$cudom);
+     }
+     return $return;
  }
  sub receipt {
-     return &ireceipt($ENV{'user.name'},$ENV{'user.domain'},
+     my ($part)=@_;
-                      $ENV{'request.course.id'},&symbread());
+     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
+     return &ireceipt($name,$domain,$courseid,$symb,$part);
  }
  # ------------------------------------------------------------ Serves up a file
- # returns either the contents of the file or a -1
+ # returns either the contents of the file or
+ # -1 if the file doesn't exist
+ #
+ # if the target is a file that was uploaded via DOCS,
+ # a check will be made to see if a current copy exists on the local server,
+ # if it does this will be served, otherwise a copy will be retrieved from
+ # the home server for the course and stored in /home/httpd/html/userfiles on
+ # the local server.
  sub getfile {
-   my $file=shift;
+     my ($file) = @_;
-   &repcopy($file);
+     if ($file =~ m -^/*(uploaded|editupload)/-) { $file=&filelocation("",$file); }
-   if (! -e $file ) { return -1; };
+     &repcopy($file);
-   my $fh=Apache::File->new($file);
+     return &readfile($file);
-   my $a='';
+ }
-   while (<$fh>) { $a .=$_; }
-   return $a
+ sub repcopy_userfile {
+     my ($file)=@_;
+     if ($file =~ m -^/*(uploaded|editupload)/-) { $file=&filelocation("",$file); }
+     if ($file =~ m|^/home/httpd/html/lonUsers/|) { return 'ok'; }
+     my ($cdom,$cnum,$filename) =
+ 	($file=~m|^\Q$perlvar{'lonDocRoot'}\E/+userfiles/+([^/]+)/+([^/]+)/+(.*)|);
+     my ($info,$rtncode);
+     my $uri="/uploaded/$cdom/$cnum/$filename";
+     if (-e "$file") {
+ 	my @fileinfo = stat($file);
+ 	my $lwpresp = &getuploaded('HEAD',$uri,$cdom,$cnum,\$info,\$rtncode);
+ 	if ($lwpresp ne 'ok') {
+ 	    if ($rtncode eq '404') {
+ 		unlink($file);
+ 	    }
+ 	    #my $ua=new LWP::UserAgent;
+ 	    #my $request=new HTTP::Request('GET',&tokenwrapper($uri));
+ 	    #my $response=$ua->request($request);
+ 	    #if ($response->is_success()) {
+ 	#	return $response->content;
+ 	#    } else {
+ 	#	return -1;
+ 	#    }
+ 	    return -1;
+ 	}
+ 	if ($info < $fileinfo[9]) {
+ 	    return 'ok';
+ 	}
+ 	$info = '';
+ 	$lwpresp = &getuploaded('GET',$uri,$cdom,$cnum,\$info,\$rtncode);
+ 	if ($lwpresp ne 'ok') {
+ 	    return -1;
+ 	}
+     } else {
+ 	my $lwpresp = &getuploaded('GET',$uri,$cdom,$cnum,\$info,\$rtncode);
+ 	if ($lwpresp ne 'ok') {
+ 	    my $ua=new LWP::UserAgent;
+ 	    my $request=new HTTP::Request('GET',&tokenwrapper($uri));
+ 	    my $response=$ua->request($request);
+ 	    if ($response->is_success()) {
+ 		$info=$response->content;
+ 	    } else {
+ 		return -1;
+ 	    }
+ 	}
+ 	my @parts = ($cdom,$cnum);
+ 	if ($filename =~ m|^(.+)/[^/]+$|) {
+ 	    push @parts, split(/\//,$1);
+ 	}
+ 	my $path = $perlvar{'lonDocRoot'}.'/userfiles';
+ 	foreach my $part (@parts) {
+ 	    $path .= '/'.$part;
+ 	    if (!-e $path) {
+ 		mkdir($path,0770);
+ 	    }
+ 	}
+     }
+     open(FILE,">$file");
+     print FILE $info;
+     close(FILE);
+     return 'ok';
+ }
+ sub tokenwrapper {
+     my $uri=shift;
+     $uri=~s|^http\://([^/]+)||;
+     $uri=~s|^/||;
+     $env{'user.environment'}=~/\/([^\/]+)\.id/;
+     my $token=$1;
+     my (undef,$udom,$uname,$file)=split('/',$uri,4);
+     if ($udom && $uname && $file) {
+ 	$file=~s|(\?\.*)*$||;
+         &appenv("userfile.$udom/$uname/$file" => $env{'request.course.id'});
+         return 'http://'.$hostname{ &homeserver($uname,$udom)}.'/'.$uri.
+                (($uri=~/\?/)?'&':'?').'token='.$token.
+                                '&tokenissued='.$perlvar{'lonHostID'};
+     } else {
+         return '/adm/notfound.html';
+     }
+ }
+ sub getuploaded {
+     my ($reqtype,$uri,$cdom,$cnum,$info,$rtncode) = @_;
+     $uri=~s/^\///;
+     $uri = 'http://'.$hostname{ &homeserver($cnum,$cdom)}.'/raw/'.$uri;
+     my $ua=new LWP::UserAgent;
+     my $request=new HTTP::Request($reqtype,$uri);
+     my $response=$ua->request($request);
+     $$rtncode = $response->code;
+     if (! $response->is_success()) {
+ 	return 'failed';
+     }
+     if ($reqtype eq 'HEAD') {
+ 	$$info = &HTTP::Date::str2time( $response->header('Last-modified') );
+     } elsif ($reqtype eq 'GET') {
+ 	$$info = $response->content;
+     }
+     return 'ok';
+ }
+ sub readfile {
+     my $file = shift;
+     if ( (! -e $file ) || ($file eq '') ) { return -1; };
+     my $fh;
+     open($fh,"<$file");
+     my $a='';
+     while (<$fh>) { $a .=$_; }
+     return $a;
  }
  sub filelocation {
-   my ($dir,$file) = @_;
+     my ($dir,$file) = @_;
-   my $location;
+     my $location;
-   $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
+     $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
-   if ($file=~m:^/~:) { # is a contruction space reference
+     if ($file=~m:^/~:) { # is a contruction space reference
-     $location = $file;
+         $location = $file;
-     $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
+         $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
-   } else {
+     } elsif ($file=~/^\/*(uploaded|editupload)/) { # is an uploaded file
-     $file=~s/^$perlvar{'lonDocRoot'}//;
+         my ($udom,$uname,$filename)=
-     $file=~s:^/*res::;
+   	    ($file=~m -^/+(?:uploaded|editupload)/+([^/]+)/+([^/]+)/+(.*)$-);
-     if ( !( $file =~ m:^/:) ) {
+         my $home=&homeserver($uname,$udom);
-       $location = $dir. '/'.$file;
+         my $is_me=0;
+         my @ids=&current_machine_ids();
+         foreach my $id (@ids) { if ($id eq $home) { $is_me=1; } }
+         if ($is_me) {
+   	    $location=&Apache::loncommon::propath($udom,$uname).
+   	      '/userfiles/'.$filename;
+         } else {
+   	  $location=$Apache::lonnet::perlvar{'lonDocRoot'}.'/userfiles/'.
+   	      $udom.'/'.$uname.'/'.$filename;
+         }
      } else {
-       $location = '/home/httpd/html/res'.$file;
+         $file=~s/^\Q$perlvar{'lonDocRoot'}\E//;
+         $file=~s:^/res/:/:;
+         if ( !( $file =~ m:^/:) ) {
+             $location = $dir. '/'.$file;
+         } else {
+             $location = '/home/httpd/html/res'.$file;
+         }
      }
-   }
+     $location=~s://+:/:g; # remove duplicate /
-   $location=~s://+:/:g; # remove duplicate /
+     while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
-   while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
+     while ($location=~m:/\./:) {$location=~ s:/\./:/:g;} #remove /./
-   return $location;
+     return $location;
  }
  sub hreflocation {
      my ($dir,$file)=@_;
-     unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {
+     unless (($file=~m-^http://-i) || ($file=~m-^/-)) {
-        my $finalpath=filelocation($dir,$file);
+ 	my $finalpath=filelocation($dir,$file);
-        $finalpath=~s/^\/home\/httpd\/html//;
+ 	$finalpath=~s-^/home/httpd/html--;
-        $finalpath=~s-/home/(\w+)/public_html/-/~$1/-;
+ 	$finalpath=~s-^/home/(\w+)/public_html/-/~$1/-;
-        return $finalpath;
+ 	return $finalpath;
-     } else {
+     } elsif ($file=~m-^/home-) {
-        return $file;
+ 	$file=~s-^/home/httpd/html--;
+ 	$file=~s-^/home/(\w+)/public_html/-/~$1/-;
+ 	return $file;
+     }
+     return $file;
+ }
+ sub current_machine_domains {
+     my $hostname=$hostname{$perlvar{'lonHostID'}};
+     my @domains;
+     while( my($id, $name) = each(%hostname)) {
+ #	&logthis("-$id-$name-$hostname-");
+ 	if ($hostname eq $name) {
+ 	    push(@domains,$hostdom{$id});
+ 	}
      }
+     return @domains;
+ }
+ sub current_machine_ids {
+     my $hostname=$hostname{$perlvar{'lonHostID'}};
+     my @ids;
+     while( my($id, $name) = each(%hostname)) {
+ #	&logthis("-$id-$name-$hostname-");
+ 	if ($hostname eq $name) {
+ 	    push(@ids,$id);
+ 	}
+     }
+     return @ids;
  }
  # ------------------------------------------------------------- Declutters URLs
  sub declutter {
      my $thisfn=shift;
-     $thisfn=~s/^$perlvar{'lonDocRoot'}//;
+     if ($thisfn=~m|^/enc/|) { $thisfn=&Apache::lonenc::unencrypted($thisfn); }
+     $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
      $thisfn=~s/^\///;
      $thisfn=~s/^res\///;
      $thisfn=~s/\?.+$//;
      return $thisfn;
  }
+ # ------------------------------------------------------------- Clutter up URLs
+ sub clutter {
+     my $thisfn='/'.&declutter(shift);
+     unless ($thisfn=~/^\/(uploaded|editupload|adm|userfiles|ext|raw|priv|public)\//) {
+        $thisfn='/res'.$thisfn;
+     }
+     return $thisfn;
+ }
+ sub freeze_escape {
+     my ($value)=@_;
+     if (ref($value)) {
+ 	$value=&nfreeze($value);
+ 	return '__FROZEN__'.&escape($value);
+     }
+     return &escape($value);
+ }
  # -------------------------------------------------------- Escape Special Chars
  sub escape {
- Line 2901  sub unescape {
+ Line 5759  sub unescape {
      return $str;
  }
+ sub thaw_unescape {
+     my ($value)=@_;
+     if ($value =~ /^__FROZEN__/) {
+ 	substr($value,0,10,undef);
+ 	$value=&unescape($value);
+ 	return &thaw($value);
+     }
+     return &unescape($value);
+ }
+ sub mod_perl_version {
+     return 1;
+     if (defined($perlvar{'MODPERL2'})) {
+ 	return 2;
+     }
+ }
+ sub correct_line_ends {
+     my ($result)=@_;
+     $$result =~s/\r\n/\n/mg;
+     $$result =~s/\r/\n/mg;
+ }
  # ================================================================ Main Program
  sub goodbye {
     &logthis("Starting Shut down");
+ #not converted to using infrastruture and probably shouldn't be
+    &logthis(sprintf("%-20s is %s",'%badServerCache',length(&freeze(\%badServerCache))));
+ #converted
+ #   &logthis(sprintf("%-20s is %s",'%metacache',scalar(%metacache)));
+    &logthis(sprintf("%-20s is %s",'%homecache',length(&freeze(\%homecache))));
+ #   &logthis(sprintf("%-20s is %s",'%titlecache',length(&freeze(\%titlecache))));
+ #   &logthis(sprintf("%-20s is %s",'%courseresdatacache',length(&freeze(\%courseresdatacache))));
+ #1.1 only
+ #   &logthis(sprintf("%-20s is %s",'%userresdatacache',length(&freeze(\%userresdatacache))));
+ #   &logthis(sprintf("%-20s is %s",'%getsectioncache',length(&freeze(\%getsectioncache))));
+ #   &logthis(sprintf("%-20s is %s",'%courseresversioncache',length(&freeze(\%courseresversioncache))));
+ #   &logthis(sprintf("%-20s is %s",'%resversioncache',length(&freeze(\%resversioncache))));
+    &logthis(sprintf("%-20s is %s",'%remembered',length(&freeze(\%remembered))));
+    &logthis(sprintf("%-20s is %s",'kicks',$kicks));
+    &logthis(sprintf("%-20s is %s",'hits',$hits));
     &flushcourselogs();
     &logthis("Shutting down");
+    return DONE;
  }
  BEGIN {
  # ----------------------------------- Read loncapa.conf and loncapa_apache.conf
      unless ($readit) {
  {
-     my $config=Apache::File->new("/etc/httpd/conf/loncapa.conf");
+     # FIXME: Use LONCAPA::Configuration::read_conf here and omit next block
+     open(my $config,"</etc/httpd/conf/loncapa.conf");
      while (my $configline=<$config>) {
-         if ($configline =~ /^[^\#]*PerlSetVar/) {
+         if ($configline=~/\S/ && $configline =~ /^[^\#]*PerlSetVar/) {
  	   my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
             chomp($varvalue);
             $perlvar{$varname}=$varvalue;
          }
      }
+     close($config);
  }
  {
-     my $config=Apache::File->new("/etc/httpd/conf/loncapa_apache.conf");
+     open(my $config,"</etc/httpd/conf/loncapa_apache.conf");
      while (my $configline=<$config>) {
          if ($configline =~ /^[^\#]*PerlSetVar/) {
- Line 2933  BEGIN {
+ Line 5831  BEGIN {
             $perlvar{$varname}=$varvalue;
          }
      }
+     close($config);
+ }
+ # ------------------------------------------------------------ Read domain file
+ {
+     %domaindescription = ();
+     %domain_auth_def = ();
+     %domain_auth_arg_def = ();
+     my $fh;
+     if (open($fh,"<".$Apache::lonnet::perlvar{'lonTabDir'}.'/domain.tab')) {
+        while (<$fh>) {
+            next if (/^(\#|\s*$)/);
+ #           next if /^\#/;
+            chomp;
+            my ($domain, $domain_description, $def_auth, $def_auth_arg,
+ 	       $def_lang, $city, $longi, $lati) = split(/:/,$_);
+ 	   $domain_auth_def{$domain}=$def_auth;
+            $domain_auth_arg_def{$domain}=$def_auth_arg;
+ 	   $domaindescription{$domain}=$domain_description;
+ 	   $domain_lang_def{$domain}=$def_lang;
+ 	   $domain_city{$domain}=$city;
+ 	   $domain_longi{$domain}=$longi;
+ 	   $domain_lati{$domain}=$lati;
+  #         &logthis("Domain.tab: $domain, $domain_auth_def{$domain}, $domain_auth_arg_def{$domain},$domaindescription{$domain}");
+ #          &logthis("Domain.tab: $domain ".$domaindescription{$domain} );
+ 	}
+     }
+     close ($fh);
  }
  # ------------------------------------------------------------- Read hosts file
  {
-     my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
+     open(my $config,"<$perlvar{'lonTabDir'}/hosts.tab");
      while (my $configline=<$config>) {
+        next if ($configline =~ /^(\#|\s*$)/);
         chomp($configline);
-        my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
+        my ($id,$domain,$role,$name)=split(/:/,$configline);
-        $hostname{$id}=$name;
+        $name=~s/\s//g;
-        $hostdom{$id}=$domain;
+        if ($id && $domain && $role && $name) {
-        $hostip{$id}=$ip;
+ 	 $hostname{$id}=$name;
-        if ($role eq 'library') { $libserv{$id}=$name; }
+ 	 $hostdom{$id}=$domain;
+ 	 if ($role eq 'library') { $libserv{$id}=$name; }
+        }
      }
+     close($config);
+     # FIXME: dev server don't want this, production servers _do_ want this
+     #&get_iphost();
+ }
+ sub get_iphost {
+     if (%iphost) { return %iphost; }
+     foreach my $id (keys(%hostname)) {
+ 	my $name=$hostname{$id};
+ 	my $ip = gethostbyname($name);
+ 	if (!$ip || length($ip) ne 4) {
+ 	    &logthis("Skipping host $id name $name no IP found\n");
+ 	    next;
+ 	}
+ 	$ip=inet_ntoa($ip);
+ 	push(@{$iphost{$ip}},$id);
+     }
+     return %iphost;
  }
  # ------------------------------------------------------ Read spare server file
  {
-     my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
+     open(my $config,"<$perlvar{'lonTabDir'}/spare.tab");
      while (my $configline=<$config>) {
         chomp($configline);
-        if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
+        if ($configline) {
            $spareid{$configline}=1;
         }
      }
+     close($config);
  }
  # ------------------------------------------------------------ Read permissions
  {
-     my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
+     open(my $config,"<$perlvar{'lonTabDir'}/roles.tab");
      while (my $configline=<$config>) {
-        chomp($configline);
+ 	chomp($configline);
-       if ($configline) {
+ 	if ($configline) {
-        my ($role,$perm)=split(/ /,$configline);
+ 	    my ($role,$perm)=split(/ /,$configline);
-        if ($perm ne '') { $pr{$role}=$perm; }
+ 	    if ($perm ne '') { $pr{$role}=$perm; }
-       }
+ 	}
      }
+     close($config);
  }
  # -------------------------------------------- Read plain texts for permissions
  {
-     my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
+     open(my $config,"<$perlvar{'lonTabDir'}/rolesplain.tab");
      while (my $configline=<$config>) {
-        chomp($configline);
+ 	chomp($configline);
-       if ($configline) {
+ 	if ($configline) {
-        my ($short,$plain)=split(/:/,$configline);
+ 	    my ($short,$plain)=split(/:/,$configline);
-        if ($plain ne '') { $prp{$short}=$plain; }
+ 	    if ($plain ne '') { $prp{$short}=$plain; }
-       }
+ 	}
      }
+     close($config);
  }
  # ---------------------------------------------------------- Read package table
  {
-     my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
+     open(my $config,"<$perlvar{'lonTabDir'}/packages.tab");
      while (my $configline=<$config>) {
-        chomp($configline);
+ 	if ($configline !~ /\S/ || $configline=~/^#/) { next; }
-        my ($short,$plain)=split(/:/,$configline);
+ 	chomp($configline);
-        my ($pack,$name)=split(/\&/,$short);
+ 	my ($short,$plain)=split(/:/,$configline);
-        if ($plain ne '') {
+ 	my ($pack,$name)=split(/\&/,$short);
-           $packagetab{$pack.'&'.$name.'&name'}=$name;
+ 	if ($plain ne '') {
-           $packagetab{$short}=$plain;
+ 	    $packagetab{$pack.'&'.$name.'&name'}=$name;
-        }
+ 	    $packagetab{$short}=$plain;
+ 	}
      }
+     close($config);
  }
- %metacache=();
+ # ------------- set up temporary directory
+ {
+     $tmpdir = $perlvar{'lonDaemons'}.'/tmp/';
+ }
- $processmarker=$$.'_'.time.'_'.$perlvar{'lonHostID'};
+ $memcache=new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
+ $processmarker='_'.time.'_'.$perlvar{'lonHostID'};
  $dumpcount=0;
  &logtouch();
  &logthis('<font color=yellow>INFO: Read configuration</font>');
  $readit=1;
+     {
+ 	use integer;
+ 	my $test=(2**32)+1;
+ 	if ($test != 0) { $_64bit=1; } else { $_64bit=0; }
+ 	&logthis(" Detected 64bit platform ($_64bit)");
+     }
  }
  }
- Line 3050  being set.
+ Line 6016  being set.
  =back
- =head1 INTRODUCTION
+ =head1 OVERVIEW
- This module provides subroutines which interact with the
+ lonnet provides subroutines which interact with the
- lonc/lond (TCP) network layer of LON-CAPA. And Can be used to ask about
+ lonc/lond (TCP) network layer of LON-CAPA. They can be used to ask
- - classes
+ about classes, users, and resources.
- - 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
+ =head2 Symbs
- described at http://www.lon-capa.org.
- =head1 RETURN MESSAGES
+ To identify a specific instance of a resource, LON-CAPA uses symbols
+ or "symbs"X<symb>. These identifiers are built from the URL of the
+ map, the resource number of the resource in the map, and the URL of
+ the resource itself. The latter is somewhat redundant, but might help
+ if maps change.
- =over 4
+ An example is
- =item *
+  msu/korte/parts/part1.sequence___19___msu/korte/tests/part12.problem
- con_lost : unable to contact remote host
+ The respective map entry is
- =item *
+  <resource id="19" src="/res/msu/korte/tests/part12.problem"
+   title="Problem 2">
+  </resource>
- con_delayed : unable to contact remote host, message will be delivered
+ Symbs are used by the random number generator, as well as to store and
- when the connection is brought back up
+ restore data specific to a certain instance of for example a problem.
- =item *
+ =head2 Storing And Retrieving Data
- con_failed : unable to contact remote host and unable to save message
+ X<store()>X<cstore()>X<restore()>Three of the most important functions
- for later delivery
+ in C<lonnet.pm> are C<&Apache::lonnet::cstore()>,
+ C<&Apache::lonnet:restore()>, and C<&Apache::lonnet::store()>, which
+ is is the non-critical message twin of cstore. These functions are for
+ handlers to store a perl hash to a user's permanent data space in an
+ easy manner, and to retrieve it again on another call. It is expected
+ that a handler would use this once at the beginning to retrieve data,
+ and then again once at the end to send only the new data back.
- =item *
+ The data is stored in the user's data directory on the user's
+ homeserver under the ID of the course.
- error: : an error a occured, a description of the error follows the :
+ The hash that is returned by restore will have all of the previous
+ value for all of the elements of the hash.
- =item *
+ Example:
+  #creating a hash
+  my %hash;
+  $hash{'foo'}='bar';
+  #storing it
+  &Apache::lonnet::cstore(\%hash);
+  #changing a value
+  $hash{'foo'}='notbar';
+  #adding a new value
+  $hash{'bar'}='foo';
+  &Apache::lonnet::cstore(\%hash);
+  #retrieving the hash
+  my %history=&Apache::lonnet::restore();
+  #print the hash
+  foreach my $key (sort(keys(%history))) {
+    print("\%history{$key} = $history{$key}");
+  }
+ Will print out:
+  %history{1:foo} = bar
+  %history{1:keys} = foo:timestamp
+  %history{1:timestamp} = 990455579
+  %history{2:bar} = foo
+  %history{2:foo} = notbar
+  %history{2:keys} = foo:bar:timestamp
+  %history{2:timestamp} = 990455580
+  %history{bar} = foo
+  %history{foo} = notbar
+  %history{timestamp} = 990455580
+  %history{version} = 2
+ Note that the special hash entries C<keys>, C<version> and
+ C<timestamp> were added to the hash. C<version> will be equal to the
+ total number of versions of the data that have been stored. The
+ C<timestamp> attribute will be the UNIX time the hash was
+ stored. C<keys> is available in every historical section to list which
+ keys were added or changed at a specific historical revision of a
+ hash.
+ B<Warning>: do not store the hash that restore returns directly. This
+ will cause a mess since it will restore the historical keys as if the
+ were new keys. I.E. 1:foo will become 1:1:foo etc.
+ Calling convention:
+  my %record=&Apache::lonnet::restore($symb,$courseid,$domain,$uname,$home);
+  &Apache::lonnet::cstore(\%newrecord,$symb,$courseid,$domain,$uname,$home);
+ For more detailed information, see lonnet specific documentation.
+ =head1 RETURN MESSAGES
+ =over 4
+ =item * B<con_lost>: unable to contact remote host
+ =item * B<con_delayed>: unable to contact remote host, message will be delivered
+ when the connection is brought back up
- no_such_host : unable to fund a host associated with the user/domain
+ =item * B<con_failed>: unable to contact remote host and unable to save message
+ for later delivery
+ =item * B<error:>: an error a occured, a description of the error follows the :
+ =item * B<no_such_host>: unable to fund a host associated with the user/domain
  that was requested
  =back
- Line 3099  that was requested
+ Line 6145  that was requested
  =over 4
  =item *
+ X<appenv()>
- appenv(%hash) : the value of %hash is written to the user envirnoment
+ B<appenv(%hash)>: the value of %hash is written to
- file, and will be restored for each access this user makes during this
+ the user envirnoment file, and will be restored for each access this
- session, also modifies the %ENV for the current process
+ user makes during this session, also modifies the %env for the current
+ process
  =item *
+ X<delenv()>
- delenv($regexp) : removes all items from the session environment file that matches the regular expression in $regexp. The values are also delted from the current processes %ENV.
+ B<delenv($regexp)>: removes all items from the session
+ environment file that matches the regular expression in $regexp. The
+ values are also delted from the current processes %env.
  =back
- Line 3116  delenv($regexp) : removes all items from
+ Line 6165  delenv($regexp) : removes all items from
  =over 4
  =item *
+ X<queryauthenticate()>
- queryauthenticate($uname,$udom) : try to determine user's current
+ B<queryauthenticate($uname,$udom)>: try to determine user's current
  authentication scheme
  =item *
+ X<authenticate()>
- authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib
+ B<authenticate($uname,$upass,$udom)>: try to
- servers (first use the current one), $upass should be the users password
+ authenticate user from domain's lib servers (first use the current
+ one). C<$upass> should be the users password.
  =item *
+ X<homeserver()>
- homeserver($uname,$udom) : find the server which has the user's
+ B<homeserver($uname,$udom)>: find the server which has
- directory and files (there must be only one), this caches the answer,
+ the user's directory and files (there must be only one), this caches
- and also caches if there is a borken connection.
+ the answer, and also caches if there is a borken connection.
  =item *
+ X<idget()>
- idget($udom,@ids) : find the usernames behind a list of IDs (IDs are a
+ B<idget($udom,@ids)>: find the usernames behind a list of IDs
- unique resource in a domain, there must be only 1 ID per username, and
+ (IDs are a unique resource in a domain, there must be only 1 ID per
- only 1 username per ID in a specific domain) (returns hash:
+ username, and only 1 username per ID in a specific domain) (returns
- id=>name,id=>name)
+ hash: id=>name,id=>name)
  =item *
+ X<idrget()>
- idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:
+ B<idrget($udom,@unames)>: find the IDs behind a list of
- name=>id,name=>id)
+ usernames (returns hash: name=>id,name=>id)
  =item *
+ X<idput()>
- idput($udom,%ids) : store away a list of names and associated IDs
+ B<idput($udom,%ids)>: store away a list of names and associated IDs
  =item *
+ X<rolesinit()>
- rolesinit($udom,$username,$authhost) : get user privileges
+ B<rolesinit($udom,$username,$authhost)>: get user privileges
  =item *
+ X<getsection()>
- usection($udom,$uname,$cname) : finds the section of student in the
+ B<getsection($udom,$uname,$cname)>: finds the section of student in the
  course $cname, return section name/number or '' for "not in course"
  and '-1' for "no section"
  =item *
+ X<userenvironment()>
- userenvironment($udom,$uname,@what) : gets the values of the keys
+ B<userenvironment($udom,$uname,@what)>: gets the values of the keys
  passed in @what from the requested user's environment, returns a hash
  =back
- Line 3219  modify user
+ Line 6269  modify user
  =item *
- modifystudent($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,$end,$start) : modify student
+ modifystudent
+ modify a students enrollment and identification information.
+ The course id is resolved based on the current users environment.
+ This means the envoking user must be a course coordinator or otherwise
+ associated with a course.
+ This call is essentially a wrapper for lonnet::modifyuser and
+ lonnet::modify_student_enrollment
+ Inputs:
+ =over 4
+ =item B<$udom> Students loncapa domain
+ =item B<$uname> Students loncapa login name
+ =item B<$uid> Students id/student number
+ =item B<$umode> Students authentication mode
+ =item B<$upass> Students password
+ =item B<$first> Students first name
+ =item B<$middle> Students middle name
+ =item B<$last> Students last name
+ =item B<$gene> Students generation
+ =item B<$usec> Students section in course
+ =item B<$end> Unix time of the roles expiration
+ =item B<$start> Unix time of the roles start date
+ =item B<$forceid> If defined, allow $uid to be changed
+ =item B<$desiredhome> server to use as home server for student
+ =back
+ =item *
+ modify_student_enrollment
+ Change a students enrollment status in a class.  The environment variable
+ 'role.request.course' must be defined for this function to proceed.
+ Inputs:
+ =over 4
+ =item $udom, students domain
+ =item $uname, students name
+ =item $uid, students user id
+ =item $first, students first name
+ =item $middle
+ =item $last
+ =item $gene
+ =item $usec
+ =item $end
+ =item $start
+ =back
  =item *
- Line 3243  revokecustomrole($udom,$uname,$url,$role
+ Line 6369  revokecustomrole($udom,$uname,$url,$role
  =item *
- coursedescription($courseid) : course description
+ coursedescription($courseid) : returns a hash of information about the
+ specified course id, including all environment settings for the
+ course, the description of the course will be in the hash under the
+ key 'description'
  =item *
- courseresdata($coursenum,$coursedomain,@which) : request for current
+ resdata($name,$domain,$type,@which) : request for current parameter
- parameter setting for a specific course, @what should be a list of
+ setting for a specific $type, where $type is either 'course' or 'user',
- parameters to ask about. This routine caches answers for 5 minutes.
+ @what should be a list of parameters to ask about. This routine caches
+ answers for 5 minutes.
  =back
- Line 3280  subscribe($fname) : subscribe to a resou
+ Line 6410  subscribe($fname) : subscribe to a resou
  repcopy($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
+ 'unavailable', 'not_found', 'forbidden', 'ok', or
- HTTP_BAD_REQUEST, also attempts to grab the metadata for the
+ 'bad_request', also attempts to grab the metadata for the
  resource. Expects the local filesystem pathname
  (/home/httpd/html/res/....)
- Line 3335  returns the data handle
+ Line 6465  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
+ a possible symb for the URL in $thisfn, and if is an encryypted
- failure, user must be in a course, as it assumes the existance of the
+ resource that the user accessed using /enc/ returns a 1 on success, 0
- course initi hash, and uses $ENV('request.course.id'}
+ on failure, user must be in a course, as it assumes the existance of
+ the course initial hash, and uses $env('request.course.id'}
  =item *
- Line 3368  unfakeable, receipt
+ Line 6499  unfakeable, receipt
  =item *
- receipt() : API to ireceipt working off of ENV values; given out to users
+ receipt() : API to ireceipt working off of env values; given out to users
  =item *
- Line 3402  forcing spreadsheet to reevaluate the re
+ Line 6533  forcing spreadsheet to reevaluate the re
  store($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
+ be derived from the env
  =item *
- Line 3451  dumps the complete (or key matching rege
+ Line 6582  dumps the complete (or key matching rege
  =item *
+ inc($namespace,$store,$udom,$uname) : increments $store in $namespace.
+ $store can be a scalar, an array reference, or if the amount to be
+ incremented is > 1, a hash reference.
+ ($udom and $uname are optional)
+ =item *
  put($namespace,$storehash,$udom,$uname) : stores hash in namesp
  ($udom and $uname are optional)
  =item *
+ putstore($namespace,$storehash,$udomain,$uname) : stores hash in namesp
+ keys used in storehash include version information (e.g., 1:$symb:message etc.) as
+ used in records written by &store and retrieved by &restore.  This function
+ was created for use in editing discussion posts, without incrementing the
+ version number included in the key for a particular post. The colon
+ separated list of attribute names (e.g., the value associated with the key
+:keys:$symb) is also generated and passed in the ampersand separated
+ items sent to lonnet::reply().
+ =item *
  cput($namespace,$storehash,$udom,$uname) : critical put
  ($udom and $uname are optional)
- Line 3561  messages of critical importance should g
+ Line 6711  messages of critical importance should g
  =item *
- getfile($file) : returns the entire contents of a file or -1; it
+ getfile($file,$caller) : two cases - requests for files in /res or in /uploaded.
- properly subscribes to and replicates the file if neccessary.
+ (a) files in /uploaded
+   (i) If a local copy of the file exists -
+       compares modification date of local copy with last-modified date for
+       definitive version stored on home server for course. If local copy is
+       stale, requests a new version from the home server and stores it.
+       If the original has been removed from the home server, then local copy
+       is unlinked.
+   (ii) If local copy does not exist -
+       requests the file from the home server and stores it.
+   If $caller is 'uploadrep':
+     This indicates a call from lonuploadrep.pm (PerlHeaderParserHandler phase)
+     for request for files originally uploaded via DOCS.
+      - returns 'ok' if fresh local copy now available, -1 otherwise.
+   Otherwise:
+      This indicates a call from the content generation phase of the request.
+      -  returns the entire contents of the file or -1.
+ (b) files in /res
+    - returns the entire contents of a file or -1;
+    it properly subscribes to and replicates the file if neccessary.
  =item *
- Line 3582  declutter() : declutters URLs (remove do
+ Line 6753  declutter() : declutters URLs (remove do
  =back
+ =head2 Usererfile file routines (/uploaded*)
+ =over 4
+ =item *
+ userfileupload(): main rotine for putting a file in a user or course's
+                   filespace, arguments are,
+  formname - required - this is the name of the element in $env where the
+            filename, and the contents of the file to create/modifed exist
+            the filename is in $env{'form.'.$formname.'.filename'} and the
+            contents of the file is located in $env{'form.'.$formname}
+  coursedoc - if true, store the file in the course of the active role
+              of the current user
+  subdir - required - subdirectory to put the file in under ../userfiles/
+          if undefined, it will be placed in "unknown"
+  (This routine calls clean_filename() to remove any dangerous
+  characters from the filename, and then calls finuserfileupload() to
+  complete the transaction)
+  returns either the url of the uploaded file (/uploaded/....) if successful
+  and /adm/notfound.html if unsuccessful
+ =item *
+ clean_filename(): routine for cleaing a filename up for storage in
+                  userfile space, argument is:
+  filename - proposed filename
+ returns: the new clean filename
+ =item *
+ finishuserfileupload(): routine that creaes and sends the file to
+ userspace, probably shouldn't be called directly
+   docuname: username or courseid of destination for the file
+   docudom: domain of user/course of destination for the file
+   formname: same as for userfileupload()
+   fname: filename (inculding subdirectories) for the file
+  returns either the url of the uploaded file (/uploaded/....) if successful
+  and /adm/notfound.html if unsuccessful
+ =item *
+ renameuserfile(): renames an existing userfile to a new name
+   Args:
+    docuname: username or courseid of destination for the file
+    docudom: domain of user/course of destination for the file
+    old: current file name (including any subdirs under userfiles)
+    new: desired file name (including any subdirs under userfiles)
+ =item *
+ mkdiruserfile(): creates a directory is a userfiles dir
+   Args:
+    docuname: username or courseid of destination for the file
+    docudom: domain of user/course of destination for the file
+    dir: dir to create (including any subdirs under userfiles)
+ =item *
+ removeuserfile(): removes a file that exists in userfiles
+   Args:
+    docuname: username or courseid of destination for the file
+    docudom: domain of user/course of destination for the file
+    fname: filname to delete (including any subdirs under userfiles)
+ =item *
+ removeuploadedurl(): convience function for removeuserfile()
+   Args:
+    url:  a full /uploaded/... url to delete
+ =back
  =head2 HTTP Helper Routines
  =over 4

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