loncom/lonnet/perl/lonnet.pm - diff

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Diff for /loncom/lonnet/perl/lonnet.pm between versions 1.64 and 1.257

-version 1.64, 2000/11/15 23:25:59
+version 1.257, 2002/07/30 21:20:27
  Line 1
  # The LearningOnline Network
  # TCP networking package
  #
- # Functions for use by content handlers:
+ # $Id$
  #
- # plaintext(short)   : plain text explanation of short term
+ # Copyright Michigan State University Board of Trustees
- # fileembstyle(ext)  : embed style in page for file extension
+ #
- # filedescription(ext) : descriptor text for file extension
+ # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
- # allowed(short,url) : returns codes for allowed actions
+ #
- #                      F: full access
+ # LON-CAPA is free software; you can redistribute it and/or modify
- #                      U,I,K: authentication modes (cxx only)
+ # it under the terms of the GNU General Public License as published by
- #                      '': forbidden
+ # the Free Software Foundation; either version 2 of the License, or
- #                      1: user needs to choose course
+ # (at your option) any later version.
- #                      2: browse allowed
+ #
- # definerole(rolename,sys,dom,cou) : define a custom role rolename
+ # LON-CAPA is distributed in the hope that it will be useful,
- #                      set priviledges in format of lonTabs/roles.tab for
+ # but WITHOUT ANY WARRANTY; without even the implied warranty of
- #                      system, domain and course level,
+ # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- # assignrole(udom,uname,url,role,end,start) : give a role to a user for the
+ # GNU General Public License for more details.
- #                      level given by url. Optional start and end dates
+ #
- #                      (leave empty string or zero for "no date")
+ # You should have received a copy of the GNU General Public License
- # assigncustomrole (udom,uname,url,rdom,rnam,rolename,end,start) : give a
+ # along with LON-CAPA; if not, write to the Free Software
- #                      custom role to a user for the level given by url.
+ # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- #                      Specify name and domain of role author, and role name
+ #
- # revokerole (udom,uname,url,role) : Revoke a role for url
+ # /home/httpd/html/adm/gpl.txt
- # revokecustomrole (udom,uname,url,rdom,rnam,rolename) : Revoke a custom role
+ #
- # appenv(hash)       : adds hash to session environment
+ # http://www.lon-capa.org/
- # delenv(varname)    : deletes all environment entries starting with varname
- # store(hash)        : stores hash permanently for this url
- # cstore(hash)       : critical store
- # restore            : returns hash for this url
- # eget(namesp,array) : returns hash with keys from array filled in from namesp
- # get(namesp,array)  : returns hash with keys from array filled in from namesp
- # del(namesp,array)  : deletes keys out of array from namesp
- # put(namesp,hash)   : stores hash in namesp
- # cput(namesp,hash)  : critical put
- # dump(namesp)       : dumps the complete namespace into a hash
- # ssi(url,hash)      : does a complete request cycle on url to localhost, posts
- #                      hash
- # coursedescription(id) : returns and caches course description for id
- # repcopy(filename)  : replicate file
- # dirlist(url)       : gets a directory listing
- # directcondval(index) : reading condition value of single condition from
- #                        state string
- # condval(index)     : value of condition index based on state
- # EXT(name)          : value of a variable
- # symblist(map,hash) : Updates symbolic storage links
- # symbread([filename]) : returns the data handle (filename optional)
- # rndseed()          : returns a random seed
- # getfile(filename)  : returns the contents of filename, or a -1 if it can't
- #                      be found, replicates and subscribes to the file
- # filelocation(dir,file) : returns a farily clean absolute reference to file
- #                          from the directory dir
- # hreflocation(dir,file) : same as filelocation, but for hrefs
- # log(domain,user,home,msg) : write to permanent log for user
  #
  # 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,
- Line 67
+ Line 39
  # 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 Gerd Kortemeyer
+ # 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;
- Line 76  use Apache::File;
+ Line 77  use Apache::File;
  use LWP::UserAgent();
  use HTTP::Headers;
  use vars
- qw(%perlvar %hostname %homecache %spareid %hostdom %libserv %pr %prp %fe %fd $readit);
+ qw(%perlvar %hostname %homecache %badServerCache %hostip %spareid %hostdom
+    %libserv %pr %prp %metacache %packagetab
+    %courselogs %accesshash $processmarker $dumpcount
+    %coursedombuf %coursehombuf %courseresdatacache %domaindescription);
  use IO::Socket;
  use GDBM_File;
  use Apache::Constants qw(:common :http);
+ use HTML::LCParser;
+ use Fcntl qw(:flock);
+ my $readit;
  # --------------------------------------------------------------------- Logging
+ sub logtouch {
+     my $execdir=$perlvar{'lonDaemons'};
+     unless (-e "$execdir/logs/lonnet.log") {
+ 	my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
+ 	close $fh;
+     }
+     my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
+     chown($wwwuid,$wwwgid,$execdir.'/logs/lonnet.log');
+ }
  sub logthis {
      my $message=shift;
      my $execdir=$perlvar{'lonDaemons'};
- Line 120  sub subreply {
+ Line 137  sub subreply {
  sub reply {
      my ($cmd,$server)=@_;
+     unless (defined($hostname{$server})) { return 'no_such_host'; }
      my $answer=subreply($cmd,$server);
-     if ($answer eq 'con_lost') { $answer=subreply($cmd,$server); }
+     if ($answer eq 'con_lost') {
-     if (($answer=~/^error:/) || ($answer=~/^refused/) ||
+        #sleep 5;
-         ($answer=~/^rejected/)) {
+        #$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 $answer</font>");
      }
- Line 163  sub reconlonc {
+ Line 195  sub reconlonc {
  sub critical {
      my ($cmd,$server)=@_;
+     unless ($hostname{$server}) {
+         &logthis("<font color=blue>WARNING:".
+                " Critical message to unknown server ($server)</font>");
+         return 'no_such_host';
+     }
      my $answer=reply($cmd,$server);
      if ($answer eq 'con_lost') {
          my $pingreply=reply('ping',$server);
- Line 212  sub critical {
+ Line 249  sub critical {
  sub appenv {
      my %newenv=@_;
-     map {
+     foreach (keys %newenv) {
  	if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
              &logthis("<font color=blue>WARNING: ".
-                 "Attempt to modify environment ".$_." to ".$newenv{$_});
+                 "Attempt to modify environment ".$_." to ".$newenv{$_}
+                 .'</font>');
  	    delete($newenv{$_});
          } else {
              $ENV{$_}=$newenv{$_};
          }
-     } keys %newenv;
+     }
+     my $lockfh;
+     unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {
+        return 'error: '.$!;
+     }
+     unless (flock($lockfh,LOCK_EX)) {
+          &logthis("<font color=blue>WARNING: ".
+                   'Could not obtain exclusive lock in appenv: '.$!);
+          $lockfh->close();
+          return 'error: '.$!;
+     }
      my @oldenv;
      {
       my $fh;
       unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
- 	return 'error';
+ 	return 'error: '.$!;
       }
       @oldenv=<$fh>;
+      $fh->close();
      }
      for (my $i=0; $i<=$#oldenv; $i++) {
          chomp($oldenv[$i]);
- Line 247  sub appenv {
+ Line 298  sub appenv {
       foreach $newname (keys %newenv) {
  	 print $fh "$newname=$newenv{$newname}\n";
       }
+      $fh->close();
      }
+     $lockfh->close();
      return 'ok';
  }
  # ----------------------------------------------------- Delete from Environment
- Line 266  sub delenv {
+ Line 320  sub delenv {
       unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
  	return 'error';
       }
+      unless (flock($fh,LOCK_SH)) {
+          &logthis("<font color=blue>WARNING: ".
+                   'Could not obtain shared lock in delenv: '.$!);
+          $fh->close();
+          return 'error: '.$!;
+      }
       @oldenv=<$fh>;
+      $fh->close();
      }
      {
       my $fh;
       unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
  	return 'error';
       }
-      map {
+      unless (flock($fh,LOCK_EX)) {
+          &logthis("<font color=blue>WARNING: ".
+                   'Could not obtain exclusive lock in delenv: '.$!);
+          $fh->close();
+          return 'error: '.$!;
+      }
+      foreach (@oldenv) {
  	 unless ($_=~/^$delthis/) { print $fh $_; }
-      } @oldenv;
+      }
+      $fh->close();
      }
      return 'ok';
  }
- Line 296  sub spareserver {
+ Line 364  sub spareserver {
      return $spareserver;
  }
+ # --------------------------------------------- Try to change a user's password
+ sub changepass {
+     my ($uname,$udom,$currentpass,$newpass,$server)=@_;
+     $currentpass = &escape($currentpass);
+     $newpass     = &escape($newpass);
+     my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass",
+ 		       $server);
+     if (! $answer) {
+ 	&logthis("No reply on password change request to $server ".
+ 		 "by $uname in domain $udom.");
+     } elsif ($answer =~ "^ok") {
+         &logthis("$uname in $udom successfully changed their password ".
+ 		 "on $server.");
+     } elsif ($answer =~ "^pwchange_failure") {
+ 	&logthis("$uname in $udom was unable to change their password ".
+ 		 "on $server.  The action was blocked by either lcpasswd ".
+ 		 "or pwchange");
+     } elsif ($answer =~ "^non_authorized") {
+         &logthis("$uname in $udom did not get their password correct when ".
+ 		 "attempting to change it on $server.");
+     } elsif ($answer =~ "^auth_mode_error") {
+         &logthis("$uname in $udom attempted to change their password despite ".
+ 		 "not being locally or internally authenticated on $server.");
+     } elsif ($answer =~ "^unknown_user") {
+         &logthis("$uname in $udom attempted to change their password ".
+ 		 "on $server but were unable to because $server is not ".
+ 		 "their home server.");
+     } elsif ($answer =~ "^refused") {
+ 	&logthis("$server refused to change $uname in $udom password because ".
+ 		 "it was sent an unencrypted request to change the password.");
+     }
+     return $answer;
+ }
+ # ----------------------- Try to determine user's current authentication scheme
+ sub queryauthenticate {
+     my ($uname,$udom)=@_;
+     if (($perlvar{'lonRole'} eq 'library') &&
+         ($udom eq $perlvar{'lonDefDomain'})) {
+ 	my $answer=reply("encrypt:currentauth:$udom:$uname",
+ 			 $perlvar{'lonHostID'});
+ 	unless ($answer eq 'unknown_user' or $answer eq 'refused') {
+ 	    if (length($answer)) {
+ 		return $answer;
+ 	    }
+ 	    else {
+ 	&logthis("User $uname at $udom lacks an authentication mechanism");
+ 		return 'no_host';
+ 	    }
+ 	}
+     }
+     my $tryserver;
+     foreach $tryserver (keys %libserv) {
+ 	if ($hostdom{$tryserver} eq $udom) {
+            my $answer=reply("encrypt:currentauth:$udom:$uname",$tryserver);
+ 	   unless ($answer eq 'unknown_user' or $answer eq 'refused') {
+ 	       if (length($answer)) {
+ 		   return $answer;
+ 	       }
+ 	       else {
+ 	   &logthis("User $uname at $udom lacks an authentication mechanism");
+ 		   return 'no_host';
+ 	       }
+ 	   }
+        }
+     }
+     &logthis("User $uname at $udom lacks an authentication mechanism");
+     return 'no_host';
+ }
  # --------- Try to authenticate user from domain's lib servers (first this one)
  sub authenticate {
      my ($uname,$upass,$udom)=@_;
      $upass=escape($upass);
+     $uname=~s/\W//g;
      if (($perlvar{'lonRole'} eq 'library') &&
          ($udom eq $perlvar{'lonDefDomain'})) {
      my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
- Line 339  sub authenticate {
+ Line 481  sub authenticate {
  # ---------------------- Find the homebase for a user from domain's lib servers
  sub homeserver {
-     my ($uname,$udom)=@_;
+     my ($uname,$udom,$ignoreBadCache)=@_;
      my $index="$uname:$udom";
-     if ($homecache{$index}) { return "$homecache{$index}"; }
+     if ($homecache{$index}) {
+         return "$homecache{$index}";
+     }
      my $tryserver;
      foreach $tryserver (keys %libserv) {
+         next if ($ignoreBadCache ne 'true' &&
+ 		 exists($badServerCache{$tryserver}));
  	if ($hostdom{$tryserver} eq $udom) {
             my $answer=reply("home:$udom:$uname",$tryserver);
             if ($answer eq 'found') {
- 	      $homecache{$index}=$tryserver;
+               $homecache{$index}=$tryserver;
                return $tryserver;
- 	   }
+            } elsif ($answer eq 'no_host') {
+ 	       $badServerCache{$tryserver}=1;
+            }
         }
      }
      return 'no_host';
  }
+ # ------------------------------------- Find the usernames behind a list of IDs
+ sub idget {
+     my ($udom,@ids)=@_;
+     my %returnhash=();
+     my $tryserver;
+     foreach $tryserver (keys %libserv) {
+        if ($hostdom{$tryserver} eq $udom) {
+ 	  my $idlist=join('&',@ids);
+           $idlist=~tr/A-Z/a-z/;
+ 	  my $reply=&reply("idget:$udom:".$idlist,$tryserver);
+           my @answer=();
+           if (($reply ne 'con_lost') && ($reply!~/^error\:/)) {
+ 	      @answer=split(/\&/,$reply);
+           }                    ;
+           my $i;
+           for ($i=0;$i<=$#ids;$i++) {
+               if ($answer[$i]) {
+ 		  $returnhash{$ids[$i]}=$answer[$i];
+               }
+           }
+        }
+     }
+     return %returnhash;
+ }
+ # ------------------------------------- Find the IDs behind a list of usernames
+ sub idrget {
+     my ($udom,@unames)=@_;
+     my %returnhash=();
+     foreach (@unames) {
+         $returnhash{$_}=(&userenvironment($udom,$_,'id'))[1];
+     }
+     return %returnhash;
+ }
+ # ------------------------------- Store away a list of names and associated IDs
+ sub idput {
+     my ($udom,%ids)=@_;
+     my %servers=();
+     foreach (keys %ids) {
+         my $uhom=&homeserver($_,$udom);
+         if ($uhom ne 'no_host') {
+             my $id=&escape($ids{$_});
+             $id=~tr/A-Z/a-z/;
+             my $unam=&escape($_);
+ 	    if ($servers{$uhom}) {
+ 		$servers{$uhom}.='&'.$id.'='.$unam;
+             } else {
+                 $servers{$uhom}=$id.'='.$unam;
+             }
+             &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);
+         }
+     }
+     foreach (keys %servers) {
+         &critical('idput:'.$udom.':'.$servers{$_},$_);
+     }
+ }
+ # ------------------------------------- Find the section of student in a course
+ sub usection {
+     my ($udom,$unam,$courseid)=@_;
+     $courseid=~s/\_/\//g;
+     $courseid=~s/^(\w)/\/$1/;
+     foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
+                         &homeserver($unam,$udom)))) {
+         my ($key,$value)=split(/\=/,$_);
+         $key=&unescape($key);
+         if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
+             my $section=$1;
+             if ($key eq $courseid.'_st') { $section=''; }
+ 	    my ($dummy,$end,$start)=split(/\_/,&unescape($value));
+             my $now=time;
+             my $notactive=0;
+             if ($start) {
+ 		if ($now<$start) { $notactive=1; }
+             }
+             if ($end) {
+                 if ($now>$end) { $notactive=1; }
+             }
+             unless ($notactive) { return $section; }
+         }
+     }
+     return '-1';
+ }
+ # ------------------------------------- Read an entry from a user's environment
+ sub userenvironment {
+     my ($udom,$unam,@what)=@_;
+     my %returnhash=();
+     my @answer=split(/\&/,
+                 &reply('get:'.$udom.':'.$unam.':environment:'.join('&',@what),
+                       &homeserver($unam,$udom)));
+     my $i;
+     for ($i=0;$i<=$#what;$i++) {
+ 	$returnhash{$what[$i]}=&unescape($answer[$i]);
+     }
+     return %returnhash;
+ }
  # ----------------------------- Subscribe to a resource, return URL if possible
  sub subscribe {
- Line 380  sub subscribe {
+ Line 631  sub subscribe {
  sub repcopy {
      my $filename=shift;
      $filename=~s/\/+/\//g;
+     if ($filename=~/^\/home\/httpd\/html\/adm\//) { return OK; }
      my $transname="$filename.in.transfer";
      if ((-e $filename) || (-e $transname)) { return OK; }
      my $remoteurl=subscribe($filename);
- Line 445  sub ssi {
+ Line 697  sub ssi {
      if (%form) {
        $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
-       $request->content(join '&', map { "$_=$form{$_}" } keys %form);
+       $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
      } else {
        $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
      }
- Line 456  sub ssi {
+ Line 708  sub ssi {
      return $response->content;
  }
+ # ------- Add a token to a remote URI's query string to vouch for access rights
+ sub tokenwrapper {
+     my $uri=shift;
+     my $token=&reply('tmpput:'.&escape($uri),$perlvar{'lonHostID'});
+     return $uri.(($uri=~/\?/)?'&':'?').
+ 	'token='.$token.'&server='.$perlvar{'lonHostID'};
+ }
+ # --------------- Take an uploaded file and put it into the userfiles directory
+ # input: name of form element
+ # output: url of file in userspace
+ sub userfileupload {
+     my $formname=shift;
+     my $fname=$ENV{'form.'.$formname.'.filename'};
+     $fname=~s/\\/\//g;
+     $fname=~s/^.*\/([^\/]+)$/$1/;
+     unless ($fname) { return 'error: no uploaded file'; }
+     chop($ENV{'form.'.$formname});
+     my $path='/userfiles/'.$ENV{'user.domain'}.'/'.$ENV{'user.name'}.'/';
+ #
+ # FIXME: actually save file
+ #
+     return 'http;//'.$ENV{'SERVER_NAME'}.$path.$fname;
+ }
  # ------------------------------------------------------------------------- Log
  sub log {
- Line 463  sub log {
+ Line 742  sub log {
      return critical("log:$dom:$nam:$what",$hom);
  }
+ # ------------------------------------------------------------------ Course Log
+ sub flushcourselogs {
+     &logthis('Flushing course log buffers');
+     foreach (keys %courselogs) {
+         my $crsid=$_;
+         if (&reply('log:'.$coursedombuf{$crsid}.':'.
+ 		          &escape($courselogs{$crsid}),
+ 		          $coursehombuf{$crsid}) eq 'ok') {
+ 	    delete $courselogs{$crsid};
+         } else {
+             &logthis('Failed to flush log buffer for '.$crsid);
+             if (length($courselogs{$crsid})>40000) {
+                &logthis("<font color=blue>WARNING: Buffer for ".$crsid.
+                         " exceeded maximum size, deleting.</font>");
+                delete $courselogs{$crsid};
+             }
+         }
+     }
+     &logthis('Flushing access logs');
+     foreach (keys %accesshash) {
+         my $entry=$_;
+         $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;
+         my %temphash=($entry => $accesshash{$entry});
+         if (&Apache::lonnet::put('resevaldata',\%temphash,$1,$2) eq 'ok') {
+ 	    delete $accesshash{$entry};
+         }
+     }
+     $dumpcount++;
+ }
+ sub courselog {
+     my $what=shift;
+     $what=time.':'.$what;
+     unless ($ENV{'request.course.id'}) { return ''; }
+     $coursedombuf{$ENV{'request.course.id'}}=
+        $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
+        $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
+     $coursehombuf{$ENV{'request.course.id'}}=
+        $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+     if (defined $courselogs{$ENV{'request.course.id'}}) {
+ 	$courselogs{$ENV{'request.course.id'}}.='&'.$what;
+     } else {
+ 	$courselogs{$ENV{'request.course.id'}}.=$what;
+     }
+     if (length($courselogs{$ENV{'request.course.id'}})>4048) {
+ 	&flushcourselogs();
+     }
+ }
+ sub courseacclog {
+     my $fnsymb=shift;
+     unless ($ENV{'request.course.id'}) { return ''; }
+     my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
+     if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {
+         $what.=':POST';
+ 	foreach (keys %ENV) {
+             if ($_=~/^form\.(.*)/) {
+ 		$what.=':'.$1.'='.$ENV{$_};
+             }
+         }
+     }
+     &courselog($what);
+ }
+ sub countacc {
+     my $url=&declutter(shift);
+     unless ($ENV{'request.course.id'}) { return ''; }
+     $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
+     my $key=$processmarker.'_'.$dumpcount.'___'.$url.'___count';
+     if (defined($accesshash{$key})) {
+ 	$accesshash{$key}++;
+     } else {
+         $accesshash{$key}=1;
+     }
+ }
+ # ----------------------------------------------------------- Check out an item
+ sub checkout {
+     my ($symb,$tuname,$tudom,$tcrsid)=@_;
+     my $now=time;
+     my $lonhost=$perlvar{'lonHostID'};
+     my $infostr=&escape(
+                  'CHECKOUTTOKEN&'.
+                  $tuname.'&'.
+                  $tudom.'&'.
+                  $tcrsid.'&'.
+                  $symb.'&'.
+ 		 $now.'&'.$ENV{'REMOTE_ADDR'});
+     my $token=&reply('tmpput:'.$infostr,$lonhost);
+     if ($token=~/^error\:/) {
+         &logthis("<font color=blue>WARNING: ".
+                 "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
+                  "</font>");
+         return '';
+     }
+     $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
+     $token=~tr/a-z/A-Z/;
+     my %infohash=('resource.0.outtoken' => $token,
+                   'resource.0.checkouttime' => $now,
+                   'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
+     unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
+        return '';
+     } else {
+         &logthis("<font color=blue>WARNING: ".
+                 "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
+                  "</font>");
+     }
+     if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
+                          &escape('Checkout '.$infostr.' - '.
+                                                  $token)) ne 'ok') {
+ 	return '';
+     } else {
+         &logthis("<font color=blue>WARNING: ".
+                 "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
+                  "</font>");
+     }
+     return $token;
+ }
+ # ------------------------------------------------------------ Check in an item
+ sub checkin {
+     my $token=shift;
+     my $now=time;
+     my ($ta,$tb,$lonhost)=split(/\*/,$token);
+     $lonhost=~tr/A-Z/a-z/;
+     my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
+     $dtoken=~s/\W/\_/g;
+     my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
+                  split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
+     unless (($tuname) && ($tudom)) {
+         &logthis('Check in '.$token.' ('.$dtoken.') failed');
+         return '';
+     }
+     unless (&allowed('mgr',$tcrsid)) {
+         &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
+                  $ENV{'user.name'}.' - '.$ENV{'user.domain'});
+         return '';
+     }
+     my %infohash=('resource.0.intoken' => $token,
+                   'resource.0.checkintime' => $now,
+                   'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
+     unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
+        return '';
+     }
+     if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
+                          &escape('Checkin - '.$token)) ne 'ok') {
+ 	return '';
+     }
+     return ($symb,$tuname,$tudom,$tcrsid);
+ }
+ # --------------------------------------------- Set Expire Date for Spreadsheet
+ sub expirespread {
+     my ($uname,$udom,$stype,$usymb)=@_;
+     my $cid=$ENV{'request.course.id'};
+     if ($cid) {
+        my $now=time;
+        my $key=$uname.':'.$udom.':'.$stype.':'.$usymb;
+        return &reply('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
+                             $ENV{'course.'.$cid.'.num'}.
+ 	        	    ':nohist_expirationdates:'.
+                             &escape($key).'='.$now,
+                             $ENV{'course.'.$cid.'.home'})
+     }
+     return 'ok';
+ }
+ # ----------------------------------------------------- Devalidate Spreadsheets
+ sub devalidate {
+     my $symb=shift;
+     my $cid=$ENV{'request.course.id'};
+     if ($cid) {
+ 	my $key=$ENV{'user.name'}.':'.$ENV{'user.domain'}.':';
+         my $status=
+ 	    &del('nohist_calculatedsheet',
+ 		 [$key.'studentcalc'],
+ 		 $ENV{'course.'.$cid.'.domain'},
+ 		 $ENV{'course.'.$cid.'.num'})
+ 		.' '.
+ 	    &del('nohist_calculatedsheets_'.$cid,
+ 		 [$key.'assesscalc:'.$symb]);
+         unless ($status eq 'ok ok') {
+            &logthis('Could not devalidate spreadsheet '.
+                     $ENV{'user.name'}.' at '.$ENV{'user.domain'}.' for '.
+ 		    $symb.': '.$status);
+         }
+     }
+ }
+ sub arrayref2str {
+   my ($arrayref) = @_;
+   my $result='_ARRAY_REF__';
+   foreach my $elem (@$arrayref) {
+     if (ref($elem) eq 'ARRAY') {
+       $result.=&escape(&arrayref2str($elem)).'&';
+     } elsif (ref($elem) eq 'HASH') {
+       $result.=&escape(&hashref2str($elem)).'&';
+     } elsif (ref($elem)) {
+       &logthis("Got a ref of ".(ref($elem))." skipping.");
+     } else {
+       $result.=&escape($elem).'&';
+     }
+   }
+   $result=~s/\&$//;
+   return $result;
+ }
+ sub hash2str {
+   my (%hash) = @_;
+   my $result=&hashref2str(\%hash);
+   $result=~s/^_HASH_REF__//;
+   return $result;
+ }
+ sub hashref2str {
+   my ($hashref)=@_;
+   my $result='_HASH_REF__';
+   foreach (keys(%$hashref)) {
+     if (ref($_) eq 'ARRAY') {
+       $result.=&escape(&arrayref2str($_)).'=';
+     } elsif (ref($_) eq 'HASH') {
+       $result.=&escape(&hashref2str($_)).'=';
+     } elsif (ref($_)) {
+       &logthis("Got a ref of ".(ref($_))." skipping.");
+     } else {
+       $result.=&escape($_).'=';
+     }
+     if (ref($$hashref{$_}) eq 'ARRAY') {
+       $result.=&escape(&arrayref2str($$hashref{$_})).'&';
+     } elsif (ref($$hashref{$_}) eq 'HASH') {
+       $result.=&escape(&hashref2str($$hashref{$_})).'&';
+     } elsif (ref($$hashref{$_})) {
+       &logthis("Got a ref of ".(ref($$hashref{$_}))." skipping.");
+     } else {
+       $result.=&escape($$hashref{$_}).'&';
+     }
+   }
+   $result=~s/\&$//;
+   return $result;
+ }
+ sub str2hash {
+   my ($string) = @_;
+   my %returnhash;
+   foreach (split(/\&/,$string)) {
+     my ($name,$value)=split(/\=/,$_);
+     $name=&unescape($name);
+     $value=&unescape($value);
+     if ($value =~ /^_HASH_REF__/) {
+       $value =~ s/^_HASH_REF__//;
+       my %hash=&str2hash($value);
+       $value=\%hash;
+     } elsif ($value =~ /^_ARRAY_REF__/) {
+       $value =~ s/^_ARRAY_REF__//;
+       my @array=&str2array($value);
+       $value=\@array;
+     }
+     $returnhash{$name}=$value;
+   }
+   return (%returnhash);
+ }
+ sub str2array {
+   my ($string) = @_;
+   my @returnarray;
+   foreach my $value (split(/\&/,$string)) {
+     $value=&unescape($value);
+     if ($value =~ /^_HASH_REF__/) {
+       $value =~ s/^_HASH_REF__//;
+       my %hash=&str2hash($value);
+       $value=\%hash;
+     } elsif ($value =~ /^_ARRAY_REF__/) {
+       $value =~ s/^_ARRAY_REF__//;
+       my @array=&str2array($value);
+       $value=\@array;
+     }
+     push(@returnarray,$value);
+   }
+   return (@returnarray);
+ }
+ # -------------------------------------------------------------------Temp Store
+ sub tmpreset {
+   my ($symb,$namespace,$domain,$stuname) = @_;
+   if (!$symb) {
+     $symb=&symbread();
+     if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }
+   }
+   $symb=escape($symb);
+   if (!$namespace) { $namespace=$ENV{'request.state'}; }
+   $namespace=~s/\//\_/g;
+   $namespace=~s/\W//g;
+   #FIXME needs to do something for /pub resources
+   if (!$domain) { $domain=$ENV{'user.domain'}; }
+   if (!$stuname) { $stuname=$ENV{'user.name'}; }
+   my $path=$perlvar{'lonDaemons'}.'/tmp';
+   my %hash;
+   if (tie(%hash,'GDBM_File',
+ 	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
+ 	  &GDBM_WRCREAT(),0640)) {
+     foreach my $key (keys %hash) {
+       if ($key=~ /:$symb/) {
+ 	delete($hash{$key});
+       }
+     }
+   }
+ }
+ sub tmpstore {
+   my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
+   if (!$symb) {
+     $symb=&symbread();
+     if (!$symb) { $symb= $ENV{'request.url'}; }
+   }
+   $symb=escape($symb);
+   if (!$namespace) {
+     # I don't think we would ever want to store this for a course.
+     # it seems this will only be used if we don't have a course.
+     #$namespace=$ENV{'request.course.id'};
+     #if (!$namespace) {
+       $namespace=$ENV{'request.state'};
+     #}
+   }
+   $namespace=~s/\//\_/g;
+   $namespace=~s/\W//g;
+ #FIXME needs to do something for /pub resources
+   if (!$domain) { $domain=$ENV{'user.domain'}; }
+   if (!$stuname) { $stuname=$ENV{'user.name'}; }
+   my $now=time;
+   my %hash;
+   my $path=$perlvar{'lonDaemons'}.'/tmp';
+   if (tie(%hash,'GDBM_File',
+ 	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
+ 	  &GDBM_WRCREAT(),0640)) {
+     $hash{"version:$symb"}++;
+     my $version=$hash{"version:$symb"};
+     my $allkeys='';
+     foreach my $key (keys(%$storehash)) {
+       $allkeys.=$key.':';
+       $hash{"$version:$symb:$key"}=$$storehash{$key};
+     }
+     $hash{"$version:$symb:timestamp"}=$now;
+     $allkeys.='timestamp';
+     $hash{"$version:keys:$symb"}=$allkeys;
+     if (untie(%hash)) {
+       return 'ok';
+     } else {
+       return "error:$!";
+     }
+   } else {
+     return "error:$!";
+   }
+ }
+ # -----------------------------------------------------------------Temp Restore
+ sub tmprestore {
+   my ($symb,$namespace,$domain,$stuname) = @_;
+   if (!$symb) {
+     $symb=&symbread();
+     if (!$symb) { $symb= $ENV{'request.url'}; }
+   }
+   $symb=escape($symb);
+   if (!$namespace) { $namespace=$ENV{'request.state'}; }
+   #FIXME needs to do something for /pub resources
+   if (!$domain) { $domain=$ENV{'user.domain'}; }
+   if (!$stuname) { $stuname=$ENV{'user.name'}; }
+   my %returnhash;
+   $namespace=~s/\//\_/g;
+   $namespace=~s/\W//g;
+   my %hash;
+   my $path=$perlvar{'lonDaemons'}.'/tmp';
+   if (tie(%hash,'GDBM_File',
+ 	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
+ 	  &GDBM_READER(),0640)) {
+     my $version=$hash{"version:$symb"};
+     $returnhash{'version'}=$version;
+     my $scope;
+     for ($scope=1;$scope<=$version;$scope++) {
+       my $vkeys=$hash{"$scope:keys:$symb"};
+       my @keys=split(/:/,$vkeys);
+       my $key;
+       $returnhash{"$scope:keys"}=$vkeys;
+       foreach $key (@keys) {
+ 	$returnhash{"$scope:$key"}=$hash{"$scope:$symb:$key"};
+ 	$returnhash{"$key"}=$hash{"$scope:$symb:$key"};
+       }
+     }
+     if (!(untie(%hash))) {
+       return "error:$!";
+     }
+   } else {
+     return "error:$!";
+   }
+   return %returnhash;
+ }
  # ----------------------------------------------------------------------- Store
  sub store {
-     my %storehash=@_;
+     my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
-     my $symb;
+     my $home='';
-     unless ($symb=escape(&symbread())) { return ''; }
-     my $namespace;
+     if ($stuname) { $home=&homeserver($stuname,$domain); }
-     unless ($namespace=$ENV{'request.course.id'}) { return ''; }
+     $symb=&symbclean($symb);
+     if (!$symb) { unless ($symb=&symbread()) { return ''; } }
+     &devalidate($symb);
+     $symb=escape($symb);
+     if (!$namespace) {
+        unless ($namespace=$ENV{'request.course.id'}) {
+           return '';
+        }
+     }
+     if (!$domain) { $domain=$ENV{'user.domain'}; }
+     if (!$stuname) { $stuname=$ENV{'user.name'}; }
+     if (!$home) { $home=$ENV{'user.home'}; }
      my $namevalue='';
-     map {
+     foreach (keys %$storehash) {
-         $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
+         $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
-     } keys %storehash;
+     }
      $namevalue=~s/\&$//;
-     return reply(
+     &courselog($symb.':'.$stuname.':'.$domain.':STORE:'.$namevalue);
-      "store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
+     return reply("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
- 		 "$ENV{'user.home'}");
  }
  # -------------------------------------------------------------- Critical Store
  sub cstore {
-     my %storehash=@_;
+     my ($storehash,$symb,$namespace,$domain,$stuname) = @_;
-     my $symb;
+     my $home='';
-     unless ($symb=escape(&symbread())) { return ''; }
-     my $namespace;
+     if ($stuname) { $home=&homeserver($stuname,$domain); }
-     unless ($namespace=$ENV{'request.course.id'}) { return ''; }
+     $symb=&symbclean($symb);
+     if (!$symb) { unless ($symb=&symbread()) { return ''; } }
+     &devalidate($symb);
+     $symb=escape($symb);
+     if (!$namespace) {
+        unless ($namespace=$ENV{'request.course.id'}) {
+           return '';
+        }
+     }
+     if (!$domain) { $domain=$ENV{'user.domain'}; }
+     if (!$stuname) { $stuname=$ENV{'user.name'}; }
+     if (!$home) { $home=$ENV{'user.home'}; }
      my $namevalue='';
-     map {
+     foreach (keys %$storehash) {
-         $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
+         $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
-     } keys %storehash;
+     }
      $namevalue=~s/\&$//;
-     return critical(
+     &courselog($symb.':'.$stuname.':'.$domain.':CSTORE:'.$namevalue);
-      "store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
+     return critical
- 		 "$ENV{'user.home'}");
+                 ("store:$domain:$stuname:$namespace:$symb:$namevalue","$home");
  }
  # --------------------------------------------------------------------- Restore
  sub restore {
-     my $symb;
+     my ($symb,$namespace,$domain,$stuname) = @_;
-     unless ($symb=escape(&symbread())) { return ''; }
+     my $home='';
-     my $namespace;
-     unless ($namespace=$ENV{'request.course.id'}) { return ''; }
+     if ($stuname) { $home=&homeserver($stuname,$domain); }
-     my $answer=reply(
-               "restore:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb",
+     if (!$symb) {
-               "$ENV{'user.home'}");
+       unless ($symb=escape(&symbread())) { return ''; }
+     } else {
+       $symb=&escape(&symbclean($symb));
+     }
+     if (!$namespace) {
+        unless ($namespace=$ENV{'request.course.id'}) {
+           return '';
+        }
+     }
+     if (!$domain) { $domain=$ENV{'user.domain'}; }
+     if (!$stuname) { $stuname=$ENV{'user.name'}; }
+     if (!$home) { $home=$ENV{'user.home'}; }
+     my $answer=&reply("restore:$domain:$stuname:$namespace:$symb","$home");
      my %returnhash=();
-     map {
+     foreach (split(/\&/,$answer)) {
  	my ($name,$value)=split(/\=/,$_);
          $returnhash{&unescape($name)}=&unescape($value);
-     } split(/\&/,$answer);
+     }
-     map {
+     my $version;
-         $returnhash{$_}=$returnhash{$returnhash{'version'}.':'.$_};
+     for ($version=1;$version<=$returnhash{'version'};$version++) {
-     } split(/\:/,$returnhash{$returnhash{'version'}.':keys'});
+        foreach (split(/\:/,$returnhash{$version.':keys'})) {
+           $returnhash{$_}=$returnhash{$version.':'.$_};
+        }
+     }
      return %returnhash;
  }
- Line 527  sub coursedescription {
+ Line 1271  sub coursedescription {
      $courseid=~s/^\///;
      $courseid=~s/\_/\//g;
      my ($cdomain,$cnum)=split(/\//,$courseid);
-     my $chome=homeserver($cnum,$cdomain);
+     my $chome=&homeserver($cnum,$cdomain);
      if ($chome ne 'no_host') {
-        my $rep=reply("dump:$cdomain:$cnum:environment",$chome);
+        my %returnhash=&dump('environment',$cdomain,$cnum);
-        if ($rep ne 'con_lost') {
+        if (!exists($returnhash{'con_lost'})) {
-            my $normalid=$courseid;
+            my $normalid=$cdomain.'_'.$cnum;
-            $normalid=~s/\//\_/g;
             my %envhash=();
-            my %returnhash=('home'   => $chome,
+            $returnhash{'home'}= $chome;
-                            'domain' => $cdomain,
+ 	   $returnhash{'domain'} = $cdomain;
-                            'num'    => $cnum);
+ 	   $returnhash{'num'} = $cnum;
-            map {
+            while (my ($name,$value) = each %returnhash) {
-                my ($name,$value)=split(/\=/,$_);
-                $name=&unescape($name);
-                $value=&unescape($value);
-                $returnhash{$name}=$value;
                 $envhash{'course.'.$normalid.'.'.$name}=$value;
-            } split(/\&/,$rep);
+            }
             $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
             $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
  	       $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
- Line 558  sub coursedescription {
+ Line 1297  sub coursedescription {
      return ();
  }
- # -------------------------------------------------------- Get user priviledges
+ # -------------------------------------------------------- Get user privileges
  sub rolesinit {
      my ($domain,$username,$authhost)=@_;
- Line 571  sub rolesinit {
+ Line 1310  sub rolesinit {
      my $thesestr;
      if ($rolesdump ne '') {
-         map {
+         foreach (split(/&/,$rolesdump)) {
  	  if ($_!~/^rolesdef\&/) {
              my ($area,$role)=split(/=/,$_);
              $area=~s/\_\w\w$//;
- Line 627  sub rolesinit {
+ Line 1366  sub rolesinit {
  	       }
              }
            }
-         } split(/&/,$rolesdump);
+         }
-         map {
+         my $adv=0;
+         my $author=0;
+         foreach (keys %allroles) {
              %thesepriv=();
-             map {
+             if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }
+             if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
+             foreach (split(/:/,$allroles{$_})) {
                  if ($_ ne '') {
- 		    my ($priviledge,$restrictions)=split(/&/,$_);
+ 		    my ($privilege,$restrictions)=split(/&/,$_);
                      if ($restrictions eq '') {
- 			$thesepriv{$priviledge}='F';
+ 			$thesepriv{$privilege}='F';
                      } else {
-                         if ($thesepriv{$priviledge} ne 'F') {
+                         if ($thesepriv{$privilege} ne 'F') {
- 			    $thesepriv{$priviledge}.=$restrictions;
+ 			    $thesepriv{$privilege}.=$restrictions;
                          }
                      }
                  }
-             } split(/:/,$allroles{$_});
+             }
              $thesestr='';
-             map { $thesestr.=':'.$_.'&'.$thesepriv{$_}; } keys %thesepriv;
+             foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
              $userroles.='user.priv.'.$_.'='.$thesestr."\n";
-         } keys %allroles;
+         }
+         $userroles.='user.adv='.$adv."\n".
+ 	            'user.author='.$author."\n";
+         $ENV{'user.adv'}=$adv;
      }
      return $userroles;
  }
- Line 653  sub rolesinit {
+ Line 1399  sub rolesinit {
  # --------------------------------------------------------------- get interface
  sub get {
-    my ($namespace,@storearr)=@_;
+    my ($namespace,$storearr,$udomain,$uname)=@_;
     my $items='';
-    map {
+    foreach (@$storearr) {
         $items.=escape($_).'&';
-    } @storearr;
+    }
     $items=~s/\&$//;
-  my $rep=reply("get:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
+    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
-                  $ENV{'user.home'});
+    if (!$uname) { $uname=$ENV{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
+    my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
     my @pairs=split(/\&/,$rep);
     my %returnhash=();
     my $i=0;
-    map {
+    foreach (@$storearr) {
        $returnhash{$_}=unescape($pairs[$i]);
        $i++;
-    } @storearr;
+    }
     return %returnhash;
  }
  # --------------------------------------------------------------- del interface
  sub del {
-    my ($namespace,@storearr)=@_;
+    my ($namespace,$storearr,$udomain,$uname)=@_;
     my $items='';
-    map {
+    foreach (@$storearr) {
         $items.=escape($_).'&';
-    } @storearr;
+    }
     $items=~s/\&$//;
-    return reply("del:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
+    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
-                  $ENV{'user.home'});
+    if (!$uname) { $uname=$ENV{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
+    return &reply("del:$udomain:$uname:$namespace:$items",$uhome);
  }
  # -------------------------------------------------------------- dump interface
  sub dump {
-    my $namespace=shift;
+    my ($namespace,$udomain,$uname,$regexp)=@_;
-    my $rep=reply("dump:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace",
+    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
-                 $ENV{'user.home'});
+    if (!$uname) { $uname=$ENV{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
+    if ($regexp) {
+        $regexp=&escape($regexp);
+    } else {
+        $regexp='.';
+    }
+    my $rep=reply("dump:$udomain:$uname:$namespace:$regexp",$uhome);
     my @pairs=split(/\&/,$rep);
     my %returnhash=();
-    map {
+    foreach (@pairs) {
        my ($key,$value)=split(/=/,$_);
        $returnhash{unescape($key)}=unescape($value);
-    } @pairs;
+    }
     return %returnhash;
  }
  # --------------------------------------------------------------- put interface
  sub put {
-    my ($namespace,%storehash)=@_;
+    my ($namespace,$storehash,$udomain,$uname)=@_;
+    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+    if (!$uname) { $uname=$ENV{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
     my $items='';
-    map {
+    foreach (keys %$storehash) {
-        $items.=escape($_).'='.escape($storehash{$_}).'&';
+        $items.=&escape($_).'='.&escape($$storehash{$_}).'&';
-    } keys %storehash;
+    }
     $items=~s/\&$//;
-    return reply("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
+    return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
-                  $ENV{'user.home'});
  }
  # ------------------------------------------------------ critical put interface
  sub cput {
-    my ($namespace,%storehash)=@_;
+    my ($namespace,$storehash,$udomain,$uname)=@_;
+    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
+    if (!$uname) { $uname=$ENV{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
     my $items='';
-    map {
+    foreach (keys %$storehash) {
-        $items.=escape($_).'='.escape($storehash{$_}).'&';
+        $items.=escape($_).'='.escape($$storehash{$_}).'&';
-    } keys %storehash;
+    }
     $items=~s/\&$//;
-    return critical
+    return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
-            ("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
-                  $ENV{'user.home'});
  }
  # -------------------------------------------------------------- eget interface
  sub eget {
-    my ($namespace,@storearr)=@_;
+    my ($namespace,$storearr,$udomain,$uname)=@_;
     my $items='';
-    map {
+    foreach (@$storearr) {
         $items.=escape($_).'&';
-    } @storearr;
+    }
     $items=~s/\&$//;
-  my $rep=reply("eget:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
+    if (!$udomain) { $udomain=$ENV{'user.domain'}; }
-                  $ENV{'user.home'});
+    if (!$uname) { $uname=$ENV{'user.name'}; }
+    my $uhome=&homeserver($uname,$udomain);
+    my $rep=&reply("eget:$udomain:$uname:$namespace:$items",$uhome);
     my @pairs=split(/\&/,$rep);
     my %returnhash=();
     my $i=0;
-    map {
+    foreach (@$storearr) {
        $returnhash{$_}=unescape($pairs[$i]);
        $i++;
-    } @storearr;
+    }
     return %returnhash;
  }
- # ------------------------------------------------- Check for a user priviledge
+ # ------------------------------------------------- Check for a user privilege
  sub allowed {
      my ($priv,$uri)=@_;
+     my $orguri=$uri;
      $uri=&declutter($uri);
  # Free bre access to adm and meta resources
- Line 759  sub allowed {
+ Line 1525  sub allowed {
  	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 'priv') {
+             $uri=~/([^\/]+)\/([^\/]+)\//;
+ 	    unless (($ENV{'user.name'} eq $2) && ($ENV{'user.domain'} eq $1)) {
+ 		return '';
+             }
+         }
+         if ($copyright eq 'domain') {
+             $uri=~/([^\/]+)\/([^\/]+)\//;
+ 	    unless (($ENV{'user.domain'} eq $1) ||
+                  ($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $1)) {
+ 		return '';
+             }
+         }
+     }
      my $thisallowed='';
      my $statecond=0;
      my $courseprivid='';
- Line 777  sub allowed {
+ Line 1563  sub allowed {
      }
  # Course: uri itself is a course
+     my $courseuri=$uri;
+     $courseuri=~s/\_(\d)/\/$1/;
+     $courseuri=~s/^([^\/])/\/$1/;
-     if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$uri}
+     if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
         =~/$priv\&([^\:]*)/) {
         $thisallowed.=$1;
      }
- Line 791  sub allowed {
+ Line 1580  sub allowed {
  # If this is generating or modifying users, exit with special codes
-     if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:'=~/\:$priv\:/) {
+     if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {
  	return $thisallowed;
      }
  #
- # Gathered so far: system, domain and course wide priviledges
+ # Gathered so far: system, domain and course wide privileges
  #
  # Course: See if uri or referer is an individual resource that is part of
  # the course
      if ($ENV{'request.course.id'}) {
         $courseprivid=$ENV{'request.course.id'};
         if ($ENV{'request.course.sec'}) {
            $courseprivid.='/'.$ENV{'request.course.sec'};
         }
         $courseprivid=~s/\_/\//;
         my $checkreferer=1;
-        my @uriparts=split(/\//,$uri);
+        my ($match,$cond)=&is_on_map($uri);
-        my $filename=$uriparts[$#uriparts];
+        if ($match) {
-        my $pathname=$uri;
+            $statecond=$cond;
-        $pathname=~s/\/$filename$//;
-        if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
-            /\&$filename\:([\d\|]+)\&/) {
-            $statecond=$1;
             if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
                 =~/$priv\&([^\:]*)/) {
                 $thisallowed.=$1;
                 $checkreferer=0;
             }
         }
+        if ($checkreferer) {
+ 	  my $refuri=$ENV{'httpref.'.$orguri};
+             unless ($refuri) {
+                 foreach (keys %ENV) {
+ 		    if ($_=~/^httpref\..*\*/) {
+ 			my $pattern=$_;
+                         $pattern=~s/^httpref\.\/res\///;
+                         $pattern=~s/\*/\[\^\/\]\+/g;
+                         $pattern=~s/\//\\\//g;
+                         if ($orguri=~/$pattern/) {
+ 			    $refuri=$ENV{$_};
+                         }
+                     }
+                 }
+             }
-        if (($ENV{'HTTP_REFERER'}) && ($checkreferer)) {
+          if ($refuri) {
- 	  my $refuri=$ENV{'HTTP_REFERER'};
+ 	  $refuri=&declutter($refuri);
-           $refuri=~s/^http\:\/\/$ENV{'request.host'}//i;
+           my ($match,$cond)=&is_on_map($refuri);
-           $refuri=&declutter($refuri);
+             if ($match) {
-           my @uriparts=split(/\//,$refuri);
+               my $refstatecond=$cond;
-           my $filename=$uriparts[$#uriparts];
-           my $pathname=$refuri;
-           $pathname=~s/\/$filename$//;
-           my @filenameparts=split(/\./,$uri);
-           if (&fileembstyle($filenameparts[$#filenameparts]) ne 'ssi') {
-             if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
-               /\&$filename\:([\d\|]+)\&/) {
-               my $refstatecond=$1;
                if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
                    =~/$priv\&([^\:]*)/) {
                    $thisallowed.=$1;
                    $uri=$refuri;
                    $statecond=$refstatecond;
                }
-             }
            }
+         }
         }
     }
  #
- # Gathered now: all priviledges that could apply, and condition number
+ # Gathered now: all privileges that could apply, and condition number
  #
  #
  # Full or no access?
- Line 878  sub allowed {
+ Line 1672  sub allowed {
             if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
                 my $courseid=$2;
                 my $roleid=$1.'.'.$2;
+                $courseid=~s/^\///;
                 my $expiretime=600;
                 if ($ENV{'request.role'} eq $roleid) {
  		  $expiretime=120;
- Line 891  sub allowed {
+ Line 1686  sub allowed {
                  || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
  		   if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
                         &log($ENV{'user.domain'},$ENV{'user.name'},
-                             $ENV{'user.host'},
+                             $ENV{'user.home'},
                              'Locked by res: '.$priv.' for '.$uri.' due to '.
                              $cdom.'/'.$cnum.'/'.$csec.' expire '.
                              $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
- Line 902  sub allowed {
+ Line 1697  sub allowed {
                  || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
  		   if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
                         &log($ENV{'user.domain'},$ENV{'user.name'},
-                             $ENV{'user.host'},
+                             $ENV{'user.home'},
                              'Locked by priv: '.$priv.' for '.$uri.' due to '.
                              $cdom.'/'.$cnum.'/'.$csec.' expire '.
                              $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
- Line 930  sub allowed {
+ Line 1725  sub allowed {
     if ($thisallowed=~/C/) {
         my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
+        my $unamedom=$ENV{'user.name'}.':'.$ENV{'user.domain'};
         if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
- 	   =~/\,$rolecode\,/) {
+ 	   =~/$rolecode/) {
             &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
                  'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
                  $ENV{'request.course.id'});
             return '';
         }
+        if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.users.denied'}
+ 	   =~/$unamedom/) {
+            &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
+                 'Denied by user: '.$priv.' for '.$uri.' as '.$unamedom.' in '.
+                 $ENV{'request.course.id'});
+            return '';
+        }
     }
  # Resource preferences
- Line 960  sub allowed {
+ Line 1764  sub allowed {
         }
     }
- # Restricted by state?
+ # Restricted by state or randomout?
     if ($thisallowed=~/X/) {
+       if ($ENV{'acc.randomout'}) {
+          my $symb=&symbread($uri,1);
+          if (($symb) && ($ENV{'acc.randomout'}=~/\&$symb\&/)) {
+             return '';
+          }
+       }
        if (&condval($statecond)) {
  	 return '2';
        } else {
- Line 973  sub allowed {
+ Line 1783  sub allowed {
     return 'F';
  }
+ # --------------------------------------------------- Is a resource on the map?
+ sub is_on_map {
+     my $uri=&declutter(shift);
+     my @uriparts=split(/\//,$uri);
+     my $filename=$uriparts[$#uriparts];
+     my $pathname=$uri;
+     $pathname=~s/\/$filename$//;
+     my $match=($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
+ 	       /\&$filename\:([\d\|]+)\&/);
+     if ($match) {
+        return (1,$1);
+    } else {
+        return (0,0);
+    }
+ }
  # ----------------------------------------------------------------- Define Role
  sub definerole {
    if (allowed('mcr','/')) {
      my ($rolename,$sysrole,$domrole,$courole)=@_;
-     map {
+     foreach (split('/',$sysrole)) {
  	my ($crole,$cqual)=split(/\&/,$_);
          if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
          if ($pr{'cr:s'}=~/$crole\&/) {
- Line 986  sub definerole {
+ Line 1813  sub definerole {
                 return "refused:s:$crole&$cqual";
              }
          }
-     } split('/',$sysrole);
+     }
-     map {
+     foreach (split('/',$domrole)) {
  	my ($crole,$cqual)=split(/\&/,$_);
          if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
          if ($pr{'cr:d'}=~/$crole\&/) {
- Line 995  sub definerole {
+ Line 1822  sub definerole {
                 return "refused:d:$crole&$cqual";
              }
          }
-     } split('/',$domrole);
+     }
-     map {
+     foreach (split('/',$courole)) {
  	my ($crole,$cqual)=split(/\&/,$_);
          if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
          if ($pr{'cr:c'}=~/$crole\&/) {
- Line 1004  sub definerole {
+ Line 1831  sub definerole {
                 return "refused:c:$crole&$cqual";
              }
          }
-     } split('/',$courole);
+     }
      my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
                  "$ENV{'user.domain'}:$ENV{'user.name'}:".
  	        "rolesdef_$rolename=".
- Line 1015  sub definerole {
+ Line 1842  sub definerole {
    }
  }
- # ------------------------------------------------------------------ Plain Text
+ # ---------------- Make a metadata query against the network of library servers
- sub plaintext {
+ sub metadata_query {
-     my $short=shift;
+     my ($query,$custom,$customshow,$server_array)=@_;
-     return $prp{$short};
+     my %rhash;
+     my @server_list = (defined($server_array) ? @$server_array
+                                               : keys(%libserv) );
+     for my $server (@server_list) {
+ 	unless ($custom or $customshow) {
+ 	    my $reply=&reply("querysend:".&escape($query),$server);
+ 	    $rhash{$server}=$reply;
+ 	}
+ 	else {
+ 	    my $reply=&reply("querysend:".&escape($query).':'.
+ 			     &escape($custom).':'.&escape($customshow),
+ 			     $server);
+ 	    $rhash{$server}=$reply;
+ 	}
+     }
+     return \%rhash;
  }
- # ------------------------------------------------------------------ Plain Text
+ # ----------------------------------------- Send log queries and wait for reply
- sub fileembstyle {
+ sub log_query {
-     my $ending=shift;
+     my ($uname,$udom,$query,%filters)=@_;
-     return $fe{$ending};
+     my $uhome=&homeserver($uname,$udom);
+     if ($uhome eq 'no_host') { return 'error: no_host'; }
+     my $uhost=$hostname{$uhome};
+     my $command=&escape(join(':',map{$_.'='.$filters{$_}} keys %filters));
+     my $queryid=&reply("querysend:".$query.':'.$udom.':'.$uname.':'.$command,
+                        $uhome);
+     unless ($queryid=~/^$uhost\_/) { return 'error: '.$queryid; }
+     return get_query_reply($queryid);
+ }
+ sub get_query_reply {
+     my $queryid=shift;
+     my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
+     my $reply='';
+     for (1..100) {
+ 	sleep 2;
+         if (-e $replyfile.'.end') {
+ 	    if (my $fh=Apache::File->new($replyfile)) {
+                $reply.=<$fh>;
+                $fh->close;
+ 	   } else { return 'error: reply_file_error'; }
+            return &unescape($reply);
+ 	}
+     }
+     return 'timeout:'.$queryid;
  }
- # ------------------------------------------------------------ Description Text
+ sub courselog_query {
+ #
+ # possible filters:
+ # url: url or symb
+ # username
+ # domain
+ # action: view, submit, grade
+ # start: timestamp
+ # end: timestamp
+ #
+     my (%filters)=@_;
+     unless ($ENV{'request.course.id'}) { return 'no_course'; }
+     if ($filters{'url'}) {
+ 	$filters{'url'}=&symbclean(&declutter($filters{'url'}));
+         $filters{'url'}=~s/\.(\w+)$/(\\.\\d+)*\\.$1/;
+         $filters{'url'}=~s/\.(\w+)\_\_\_/(\\.\\d+)*\\.$1/;
+     }
+     my $cname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
+     my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
+     return &log_query($cname,$cdom,'courselog',%filters);
+ }
- sub filedecription {
+ sub userlog_query {
-     my $ending=shift;
+     my ($uname,$udom,%filters)=@_;
-     return $fd{$ending};
+     return &log_query($uname,$udom,'userlog',%filters);
+ }
+ # ------------------------------------------------------------------ Plain Text
+ sub plaintext {
+     my $short=shift;
+     return $prp{$short};
  }
  # ----------------------------------------------------------------- Assign Role
- Line 1041  sub filedecription {
+ Line 1934  sub filedecription {
  sub assignrole {
      my ($udom,$uname,$url,$role,$end,$start)=@_;
      my $mrole;
-     $url=declutter($url);
      if ($role =~ /^cr\//) {
-         unless ($url=~/\.course$/) { return 'invalid'; }
+ 	unless (&allowed('ccr',$url)) {
- 	unless (allowed('ccr',$url)) { return 'refused'; }
+            &logthis('Refused custom assignrole: '.
+              $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
+ 		    $ENV{'user.name'}.' at '.$ENV{'user.domain'});
+            return 'refused';
+         }
          $mrole='cr';
      } else {
-         unless (($url=~/\.course$/) || ($url=~/\/$/)) { return 'invalid'; }
+         my $cwosec=$url;
-         unless (allowed('c'+$role)) { return 'refused'; }
+         $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
+         unless (&allowed('c'.$role,$cwosec)) {
+            &logthis('Refused assignrole: '.
+              $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
+ 		    $ENV{'user.name'}.' at '.$ENV{'user.domain'});
+            return 'refused';
+         }
          $mrole=$role;
      }
      my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
                  "$udom:$uname:$url".'_'."$mrole=$role";
-     if ($end) { $command.='_$end'; }
+     if ($end) { $command.='_'.$end; }
      if ($start) {
  	if ($end) {
-            $command.='_$start';
+            $command.='_'.$start;
          } else {
-            $command.='_0_$start';
+            $command.='_0_'.$start;
          }
      }
      return &reply($command,&homeserver($uname,$udom));
  }
+ # -------------------------------------------------- Modify user authentication
+ # Overrides without validation
+ sub modifyuserauth {
+     my ($udom,$uname,$umode,$upass)=@_;
+     my $uhome=&homeserver($uname,$udom);
+     unless (&allowed('mau',$udom)) { return 'refused'; }
+     &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
+              $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
+     my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
+ 		     &escape($upass),$uhome);
+     &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
+         'Authentication changed for '.$udom.', '.$uname.', '.$umode.
+          '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
+     &log($udom,,$uname,$uhome,
+         'Authentication changed by '.$ENV{'user.domain'}.', '.
+                                      $ENV{'user.name'}.', '.$umode.
+          '(Remote '.$ENV{'REMOTE_ADDR'}.'): '.$reply);
+     unless ($reply eq 'ok') {
+         &logthis('Authentication mode error: '.$reply);
+ 	return 'error: '.$reply;
+     }
+     return 'ok';
+ }
+ # --------------------------------------------------------------- Modify a user
+ sub modifyuser {
+     my ($udom,    $uname, $uid,
+         $umode,   $upass, $first,
+         $middle,  $last,  $gene,
+         $forceid, $desiredhome)=@_;
+     $udom=~s/\W//g;
+     $uname=~s/\W//g;
+     &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
+              $umode.', '.$first.', '.$middle.', '.
+ 	     $last.', '.$gene.'(forceid: '.$forceid.')'.
+              (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
+                                      ' desiredhome not specified').
+              ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});
+     my $uhome=&homeserver($uname,$udom,'true');
+ # ----------------------------------------------------------------- Create User
+     if (($uhome eq 'no_host') && ($umode) && ($upass)) {
+         my $unhome='';
+         if (defined($desiredhome) && $hostdom{$desiredhome} eq $udom) {
+             $unhome = $desiredhome;
+ 	} elsif($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {
+ 	    $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+         } else { # load balancing routine for determining $unhome
+             my $tryserver;
+             my $loadm=10000000;
+             foreach $tryserver (keys %libserv) {
+ 	       if ($hostdom{$tryserver} eq $udom) {
+                   my $answer=reply('load',$tryserver);
+                   if (($answer=~/\d+/) && ($answer<$loadm)) {
+ 		      $loadm=$answer;
+                       $unhome=$tryserver;
+                   }
+ 	       }
+ 	    }
+         }
+         if (($unhome eq '') || ($unhome eq 'no_host')) {
+ 	    return 'error: unable to find a home server for '.$uname.
+                    ' in domain '.$udom;
+         }
+         my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
+                          &escape($upass),$unhome);
+ 	unless ($reply eq 'ok') {
+             return 'error: '.$reply;
+         }
+         $uhome=&homeserver($uname,$udom,'true');
+         if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
+ 	    return 'error: verify home';
+         }
+     }   # End of creation of new user
+ # ---------------------------------------------------------------------- Add ID
+     if ($uid) {
+        $uid=~tr/A-Z/a-z/;
+        my %uidhash=&idrget($udom,$uname);
+        if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)
+          && (!$forceid)) {
+ 	  unless ($uid eq $uidhash{$uname}) {
+ 	      return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;
+           }
+        } else {
+ 	  &idput($udom,($uname => $uid));
+        }
+     }
+ # -------------------------------------------------------------- Add names, etc
+     my %names=&get('environment',
+ 		   ['firstname','middlename','lastname','generation'],
+ 		   $udom,$uname);
+     if ($names{'firstname'} =~ m/^error:.*/) { %names=(); }
+     if ($first)  { $names{'firstname'}  = $first; }
+     if ($middle) { $names{'middlename'} = $middle; }
+     if ($last)   { $names{'lastname'}   = $last; }
+     if ($gene)   { $names{'generation'} = $gene; }
+     my $reply = &put('environment', \%names, $udom,$uname);
+     if ($reply ne 'ok') { return 'error: '.$reply; }
+     &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
+              $umode.', '.$first.', '.$middle.', '.
+ 	     $last.', '.$gene.' by '.
+              $ENV{'user.name'}.' at '.$ENV{'user.domain'});
+     return 'ok';
+ }
+ # -------------------------------------------------------------- Modify student
+ sub modifystudent {
+     my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
+         $end,$start,$forceid,$desiredhome)=@_;
+     my $cid='';
+     unless ($cid=$ENV{'request.course.id'}) {
+ 	return 'not_in_class';
+     }
+ # --------------------------------------------------------------- Make the user
+     my $reply=&modifyuser
+ 	($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
+          $desiredhome);
+     unless ($reply eq 'ok') { return $reply; }
+     my $uhome=&homeserver($uname,$udom);
+     if (($uhome eq '') || ($uhome eq 'no_host')) {
+ 	return 'error: no such user';
+     }
+ # -------------------------------------------------- Add student to course list
+     $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.
+ 	              $ENV{'course.'.$cid.'.num'}.':classlist:'.
+                       &escape($uname.':'.$udom).'='.
+                       &escape($end.':'.$start),
+ 	              $ENV{'course.'.$cid.'.home'});
+     unless (($reply eq 'ok') || ($reply eq 'delayed')) {
+ 	return 'error: '.$reply;
+     }
+ # ---------------------------------------------------- Add student role to user
+     my $uurl='/'.$cid;
+     $uurl=~s/\_/\//g;
+     if ($usec) {
+ 	$uurl.='/'.$usec;
+     }
+     return &assignrole($udom,$uname,$uurl,'st',$end,$start);
+ }
+ # ------------------------------------------------- Write to course preferences
+ sub writecoursepref {
+     my ($courseid,%prefs)=@_;
+     $courseid=~s/^\///;
+     $courseid=~s/\_/\//g;
+     my ($cdomain,$cnum)=split(/\//,$courseid);
+     my $chome=homeserver($cnum,$cdomain);
+     if (($chome eq '') || ($chome eq 'no_host')) {
+ 	return 'error: no such course';
+     }
+     my $cstring='';
+     foreach (keys %prefs) {
+ 	$cstring.=escape($_).'='.escape($prefs{$_}).'&';
+     }
+     $cstring=~s/\&$//;
+     return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
+ }
+ # ---------------------------------------------------------- Make/modify course
+ sub createcourse {
+     my ($udom,$description,$url)=@_;
+     $url=&declutter($url);
+     my $cid='';
+     unless (&allowed('ccc',$ENV{'user.domain'})) {
+         return 'refused';
+     }
+     unless ($udom eq $ENV{'user.domain'}) {
+         return 'refused';
+     }
+ # ------------------------------------------------------------------- Create ID
+    my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+        unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+ # ----------------------------------------------- Make sure that does not exist
+    my $uhome=&homeserver($uname,$udom,'true');
+    unless (($uhome eq '') || ($uhome eq 'no_host')) {
+        $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+         unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+        $uhome=&homeserver($uname,$udom,'true');
+        unless (($uhome eq '') || ($uhome eq 'no_host')) {
+            return 'error: unable to generate unique course-ID';
+        }
+    }
+ # ------------------------------------------------------------- Make the course
+     my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
+                       $ENV{'user.home'});
+     unless ($reply eq 'ok') { return 'error: '.$reply; }
+     $uhome=&homeserver($uname,$udom,'true');
+     if (($uhome eq '') || ($uhome eq 'no_host')) {
+ 	return 'error: no such course';
+     }
+     &writecoursepref($udom.'_'.$uname,
+                      ('description' => $description,
+                       'url'         => $url));
+     return '/'.$udom.'/'.$uname;
+ }
  # ---------------------------------------------------------- Assign Custom Role
  sub assigncustomrole {
- Line 1091  sub revokecustomrole {
+ Line 2193  sub revokecustomrole {
  # ------------------------------------------------------------ Directory lister
  sub dirlist {
-     my $uri=shift;
+     my ($uri,$userdomain,$username,$alternateDirectoryRoot)=@_;
      $uri=~s/^\///;
      $uri=~s/\/$//;
-     my ($res,$udom,$uname,@rest)=split(/\//,$uri);
+     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')
+     }
-               && ($listing ne 'con_lost')) {
-                 map {
+     if($udom) {
-                   my ($entry,@stat)=split(/&/,$_);
+         if($uname) {
-                   $allusers{$entry}=1;
+             my $listing=reply('ls:'.$dirRoot.'/'.$uri,
-                 } split(/:/,$listing);
+                               homeserver($uname,$udom));
-              }
+             return split(/:/,$listing);
- 	  }
+         } elsif(!defined($alternateDirectoryRoot)) {
-        }
+             my $tryserver;
-        my $alluserstr='';
+             my %allusers=();
-        map {
+             foreach $tryserver (keys %libserv) {
-            $alluserstr.=$_.'&user:';
+                 if($hostdom{$tryserver} eq $udom) {
-        } sort keys %allusers;
+                     my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.
-        $alluserstr=~s/:$//;
+                                       $udom, $tryserver);
-        return split(/:/,$alluserstr);
+                     if (($listing ne 'no_such_dir') && ($listing ne 'empty')
-      }
+                         && ($listing ne 'con_lost')) {
-    } else {
+                         foreach (split(/:/,$listing)) {
-        my $tryserver;
+                             my ($entry,@stat)=split(/&/,$_);
-        my %alldom=();
+                             $allusers{$entry}=1;
-        foreach $tryserver (keys %libserv) {
+                         }
- 	   $alldom{$hostdom{$tryserver}}=1;
+                     }
-        }
+                 }
-        my $alldomstr='';
+             }
-        map {
+             my $alluserstr='';
-           $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
+             foreach (sort keys %allusers) {
-        } sort keys %alldom;
+                 $alluserstr.=$_.'&user:';
-        $alldomstr=~s/:$//;
+             }
-        return split(/:/,$alldomstr);
+             $alluserstr=~s/:$//;
-    }
+             return split(/:/,$alluserstr);
+         } else {
+             my @emptyResults = ();
+             push(@emptyResults, 'missing user name');
+             return split(':',@emptyResults);
+         }
+     } elsif(!defined($alternateDirectoryRoot)) {
+         my $tryserver;
+         my %alldom=();
+         foreach $tryserver (keys %libserv) {
+             $alldom{$hostdom{$tryserver}}=1;
+         }
+         my $alldomstr='';
+         foreach (sort keys %alldom) {
+             $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
+         }
+         $alldomstr=~s/:$//;
+         return split(/:/,$alldomstr);
+     } else {
+         my @emptyResults = ();
+         push(@emptyResults, 'missing domain');
+         return split(':',@emptyResults);
+     }
  }
  # -------------------------------------------------------- Value of a Condition
- Line 1153  sub condval {
+ Line 2278  sub condval {
      my $condidx=shift;
      my $result=0;
      my $allpathcond='';
-     map {
+     foreach (split(/\|/,$condidx)) {
         if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
  	   $allpathcond.=
                 '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
         }
-     } split(/\|/,$condidx);
+     }
      $allpathcond=~s/\|$//;
      if ($ENV{'request.course.id'}) {
         if ($allpathcond) {
            my $operand='|';
  	  my @stack;
-           map {
+            foreach ($allpathcond=~/(\d+|\(|\)|\&|\|)/g) {
                if ($_ eq '(') {
                   push @stack,($operand,$result)
                } elsif ($_ eq ')') {
- Line 1182  sub condval {
+ Line 2307  sub condval {
                       $result=$result>$new?$new:$result;
                    } else {
                       $result=$result>$new?$result:$new;
                    }
                }
-           } ($allpathcond=~/(\d+|\(|\)|\&|\|)/g);
+           }
         }
      }
      return $result;
  }
+ # --------------------------------------------------- Course Resourcedata Query
+ sub courseresdata {
+     my ($coursenum,$coursedomain,@which)=@_;
+     my $coursehom=&homeserver($coursenum,$coursedomain);
+     my $hashid=$coursenum.':'.$coursedomain;
+     my $dodump=0;
+     if (!defined($courseresdatacache{$hashid.'.time'})) {
+ 	$dodump=1;
+     } else {
+ 	if (time-$courseresdatacache{$hashid.'.time'}>300) { $dodump=1; }
+     }
+     if ($dodump) {
+ 	my %dumpreply=&dump('resourcedata',$coursedomain,$coursenum);
+ 	my ($tmp) = keys(%dumpreply);
+ 	if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
+ 	    $courseresdatacache{$hashid.'.time'}=time;
+ 	    $courseresdatacache{$hashid}=\%dumpreply;
+ 	}
+     }
+     foreach my $item (@which) {
+ 	if ($courseresdatacache{$hashid}->{$item}) {
+ 	    return $courseresdatacache{$hashid}->{$item};
+ 	}
+     }
+     return '';
+ }
  # --------------------------------------------------------- Value of a Variable
  sub EXT {
-     my $varname=shift;
+     my ($varname,$symbparm,$udom,$uname)=@_;
+     unless ($varname) { return ''; }
+     #get real user name/domain, courseid and symb
+     my $courseid;
+     if (!($uname && $udom)) {
+       (my $cursymb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
+       if (!$symbparm) {	$symbparm=$cursymb; }
+     } else {
+ 	$courseid=$ENV{'request.course.id'};
+     }
      my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
      my $rest;
      if ($therest[0]) {
- Line 1208  sub EXT {
+ Line 2373  sub EXT {
      if ($realm eq 'user') {
  # --------------------------------------------------------------- user.resource
  	if ($space eq 'resource') {
- 	    my %restored=&restore;
+ 	    my %restored=&restore(undef,undef,$udom,$uname);
              return $restored{$qualifierrest};
  # ----------------------------------------------------------------- user.access
          } elsif ($space eq 'access') {
+ 	    # FIXME - not supporting calls for a specific user
              return &allowed($qualifier,$rest);
  # ------------------------------------------ user.preferences, user.environment
          } elsif (($space eq 'preferences') || ($space eq 'environment')) {
-             return $ENV{join('.',('environment',$qualifierrest))};
+ 	    if (($uname eq $ENV{'user.name'}) &&
+ 		($udom eq $ENV{'user.domain'})) {
+ 		return $ENV{join('.',('environment',$qualifierrest))};
+ 	    } else {
+ 		my %returnhash=&userenvironment($udom,$uname,$qualifierrest);
+ 		return $returnhash{$qualifierrest};
+ 	    }
  # ----------------------------------------------------------------- user.course
          } elsif ($space eq 'course') {
+ 	    # FIXME - not supporting calls for a specific user
              return $ENV{join('.',('request.course',$qualifier))};
  # ------------------------------------------------------------------- user.role
          } elsif ($space eq 'role') {
+ 	    # FIXME - not supporting calls for a specific user
              my ($role,$where)=split(/\./,$ENV{'request.role'});
              if ($qualifier eq 'value') {
  		return $role;
- Line 1229  sub EXT {
+ Line 2403  sub EXT {
              }
  # ----------------------------------------------------------------- user.domain
          } elsif ($space eq 'domain') {
-             return $ENV{'user.domain'};
+             return $udom;
  # ------------------------------------------------------------------- user.name
          } elsif ($space eq 'name') {
-             return $ENV{'user.name'};
+             return $uname;
  # ---------------------------------------------------- Any other user namespace
          } else {
              my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
-             my %reply=&get($space,$item);
+             my %reply=&get($space,[$item]);
              return $reply{$item};
          }
-     } elsif ($realm eq 'request') {
+     } elsif ($realm eq 'query') {
+ # ---------------------------------------------- pull stuff out of query string
+         &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},[$space]);
+ 	return $ENV{'form.'.$space};
+    } elsif ($realm eq 'request') {
  # ------------------------------------------------------------- request.browser
          if ($space eq 'browser') {
  	    return $ENV{'browser.'.$qualifier};
- Line 1249  sub EXT {
+ Line 2427  sub EXT {
          }
      } elsif ($realm eq 'course') {
  # ---------------------------------------------------------- course.description
-         my $section='';
+         return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
-         if ($ENV{'request.course.sec'}) {
- 	    $section='_'.$ENV{'request.course.sec'};
-         }
-         return $ENV{'course.'.$ENV{'request.course.id'}.$section.'.'.
-                               $spacequalifierrest};
      } elsif ($realm eq 'resource') {
-       if ($ENV{'request.course.id'}) {
+ 	if ($courseid eq $ENV{'request.course.id'}) {
+ 	    #print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
  # ----------------------------------------------------- Cascading lookup scheme
-        my $reslevel=
+ 	    if (!$symbparm) { $symbparm=&symbread(); }
- 	    $ENV{'request.course.id'}.'.'.&symbread().'.'.$spacequalifierrest;
+ 	    my $symbp=$symbparm;
-        my $seclevel=
+ 	    my $mapp=(split(/\_\_\_/,$symbp))[0];
-             $ENV{'request.course.id'}.'.'.
- 		$ENV{'request.course.sec'}.'.'.$spacequalifierrest;
+ 	    my $symbparm=$symbp.'.'.$spacequalifierrest;
-        my $courselevel=
+ 	    my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
-             $ENV{'request.course.id'}.'.'.$spacequalifierrest;
+ 	    my $section;
+ 	    if (($ENV{'user.name'} eq $uname) &&
+ 		($ENV{'user.domain'} eq $udom)) {
+ 		$section=$ENV{'request.course.sec'};
+ 	    } else {
+ 		$section=&usection($udom,$uname,$courseid);
+ 	    }
+ 	    my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
+ 	    my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
+ 	    my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
+ 	    my $courselevel=$courseid.'.'.$spacequalifierrest;
+ 	    my $courselevelr=$courseid.'.'.$symbparm;
+ 	    my $courselevelm=$courseid.'.'.$mapparm;
  # ----------------------------------------------------------- first, check user
-       my %resourcedata=get('resourcedata',($reslevel,$seclevel,$courselevel));
+ 	    my %resourcedata=&get('resourcedata',
-       if ($resourcedata{$reslevel}!~/^error\:/) {
+ 				  [$courselevelr,$courselevelm,$courselevel],
-        if ($resourcedata{$reslevel}) { return $resourcedata{$reslevel}; }
+ 				 $udom,$uname);
-        if ($resourcedata{$seclevel}) { return $resourcedata{$seclevel}; }
+ 	    if (($resourcedata{$courselevelr}!~/^error\:/) &&
-        if ($resourcedata{$courselevel}) { return $resourcedata{$courselevel}; }
+ 		($resourcedata{$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 $section='';
-         if ($ENV{'request.course.sec'}) {
+ 	    my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
- 	    $section='_'.$ENV{'request.course.sec'};
+ 					  $ENV{'course.'.$courseid.'.domain'},
-         }
+ 					  ($seclevelr,$seclevelm,$seclevel,
-         my $reply=&reply('get:'.
+ 					   $courselevelr,$courselevelm,
-               $ENV{'course.'.$ENV{'request.course.id'}.$section.'.domain'}.':'.
+ 					   $courselevel));
-               $ENV{'course.'.$ENV{'request.course.id'}.$section.'.num'}.
+ 	    if ($coursereply) { return $coursereply; }
-               ':resourcedata:'.
-               escape($reslevel).':'.escape($seclevel).':'.escape($courselevel),
- 		   $ENV{'course.'.$ENV{'request.course.id'}.$section.'.home'});
-       if ($reply!~/^error\:/) {
-         map {
-            my ($name,$value)=split(/\=/,$_);
-            $resourcedata{unescape($name)}=unescape($value);
-         } split(/\&/,$reply);
-        if ($resourcedata{$reslevel}) { return $resourcedata{$reslevel}; }
-        if ($resourcedata{$seclevel}) { return $resourcedata{$seclevel}; }
-        if ($resourcedata{$courselevel}) { return $resourcedata{$courselevel}; }
-       }
  # ------------------------------------------------------ third, check map parms
+ 	    my %parmhash=();
-        if ($ENV{'resource.parms.'.$reslevel}) {
+ 	    my $thisparm='';
- 	   return $ENV{'resource.parms.'.$reslevel};
+ 	    if (tie(%parmhash,'GDBM_File',
-        }
+ 		    $ENV{'request.course.fn'}.'_parms.db',
-      }
+ 		    &GDBM_READER(),0640)) {
+ 		$thisparm=$parmhash{$symbparm};
+ 		untie(%parmhash);
+ 	    }
+ 	    if ($thisparm) { return $thisparm; }
+ 	}
  # --------------------------------------------- last, look in resource metadata
- 	my $uri=&declutter($ENV{'request.filename'});
-         my $filename=$perlvar{'lonDocRoot'}.'/res/'.$ENV.'.meta';
+ 	$spacequalifierrest=~s/\./\_/;
-         if (-e $filename) {
+ 	my $metadata=&metadata($ENV{'request.filename'},$spacequalifierrest);
-             my @content;
+ 	if ($metadata) { return $metadata; }
-             {
+ 	$metadata=&metadata($ENV{'request.filename'},
-              my $fh=Apache::File->new($filename);
+ 			    'parameter_'.$spacequalifierrest);
-              @content=<$fh>;
+ 	if ($metadata) { return $metadata; }
-             }
-             if (join('',@content)=~
+ # ------------------------------------------------------------------ Cascade up
-                  /\<$space[^\>]*\>([^\<]*)\<\/$space\>/) {
+ 	unless ($space eq '0') {
- 	        return $1;
+ 	    my ($part,$id)=split(/\_/,$space);
-  	    }
+ 	    if ($id) {
-         }
+ 		my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
+ 				     $symbparm,$udom,$uname);
+ 		if ($partgeneral) { return $partgeneral; }
+ 	    } else {
+ 		my $resourcegeneral=&EXT('resource.0.'.$qualifierrest,
+ 					 $symbparm,$udom,$uname);
+ 		if ($resourcegeneral) { return $resourcegeneral; }
+ 	    }
+ 	}
  # ---------------------------------------------------- Any other user namespace
      } elsif ($realm eq 'environment') {
  # ----------------------------------------------------------------- environment
-         return $ENV{$spacequalifierrest};
+ 	if (($uname eq $ENV{'user.name'})&&($udom eq $ENV{'user.domain'})) {
+ 	    return $ENV{'environment.'.$spacequalifierrest};
+ 	} else {
+ 	    my %returnhash=&userenvironment($udom,$uname,
+ 					    $spacequalifierrest);
+ 	    return $returnhash{$spacequalifierrest};
+ 	}
      } elsif ($realm eq 'system') {
  # ----------------------------------------------------------------- system.time
  	if ($space eq 'time') {
- Line 1328  sub EXT {
+ Line 2542  sub EXT {
      return '';
  }
- # ---------------------------------------- Append resource parms to environment
+ # ---------------------------------------------------------------- Get metadata
+ sub metadata {
+     my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
+     $uri=&declutter($uri);
+     my $filename=$uri;
+     $uri=~s/\.meta$//;
+ #
+ # Is the metadata already cached?
+ # Look at timestamp of caching
+ # Everything is cached by the main uri, libraries are never directly cached
+ #
+     unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600) {
+ #
+ # Is this a recursive call for a library?
+ #
+         if ($liburi) {
+ 	    $liburi=&declutter($liburi);
+             $filename=$liburi;
+         }
+         my %metathesekeys=();
+         unless ($filename=~/\.meta$/) { $filename.='.meta'; }
+ 	my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
+         my $parser=HTML::LCParser->new(\$metastring);
+         my $token;
+         undef %metathesekeys;
+         while ($token=$parser->get_token) {
+            if ($token->[0] eq 'S') {
+ 	     if (defined($token->[2]->{'package'})) {
+ #
+ # This is a package - get package info
+ #
+ 	      my $package=$token->[2]->{'package'};
+ 	      my $keyroot='';
+               if ($prefix) {
+ 		  $keyroot.='_'.$prefix;
+               } else {
+                 if (defined($token->[2]->{'part'})) {
+                    $keyroot.='_'.$token->[2]->{'part'};
+ 	        }
+ 	      }
+               if (defined($token->[2]->{'id'})) {
+                  $keyroot.='_'.$token->[2]->{'id'};
+ 	      }
+               if ($metacache{$uri.':packages'}) {
+                  $metacache{$uri.':packages'}.=','.$package.$keyroot;
+               } else {
+                  $metacache{$uri.':packages'}=$package.$keyroot;
+ 	      }
+               foreach (keys %packagetab) {
+ 		  if ($_=~/^$package\&/) {
+ 		      my ($pack,$name,$subp)=split(/\&/,$_);
+                       my $value=$packagetab{$_};
+ 		      my $part=$keyroot;
+                       $part=~s/^\_//;
+                       if ($subp eq 'display') {
+ 			  $value.=' [Part: '.$part.']';
+                       }
+                       my $unikey='parameter'.$keyroot.'_'.$name;
+                       $metathesekeys{$unikey}=1;
+                       $metacache{$uri.':'.$unikey.'.part'}=$part;
+                       unless
+                        (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {
+                          $metacache{$uri.':'.$unikey.'.'.$subp}=$value;
+ 		      }
+                   }
+               }
+              } else {
+ #
+ # This is not a package - some other kind of start tag
+ #
+               my $entry=$token->[1];
+               my $unikey;
+               if ($entry eq 'import') {
+                  $unikey='';
+               } else {
+                  $unikey=$entry;
+ 	      }
+               if ($prefix) {
+ 		  $unikey.=$prefix;
+               } else {
+                 if (defined($token->[2]->{'part'})) {
+                    $unikey.='_'.$token->[2]->{'part'};
+ 	        }
+ 	      }
+               if (defined($token->[2]->{'id'})) {
+                  $unikey.='_'.$token->[2]->{'id'};
+ 	      }
+              if ($entry eq 'import') {
+ #
+ # Importing a library here
+ #
+ 		 if (defined($depthcount)) { $depthcount++; } else
+                                            { $depthcount=0; }
+                  if ($depthcount<20) {
+ 		     foreach (split(/\,/,&metadata($uri,'keys',
+                                   $parser->get_text('/import'),$unikey,
+                                   $depthcount))) {
+                          $metathesekeys{$_}=1;
+ 		     }
+ 		 }
+              } else {
- sub appendparms {
+               if (defined($token->[2]->{'name'})) {
-     my ($symb,$parms)=@_;
+                  $unikey.='_'.$token->[2]->{'name'};
-     my %storehash=();
+ 	      }
-     my $prefix='resource.parms.'.$ENV{'request.course.id'}.'.'.$symb;
+               $metathesekeys{$unikey}=1;
-     map {
+               foreach (@{$token->[3]}) {
- 	my ($typename,$value)=split(/\=/,$_);
+ 		  $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};
-         my ($type,$name)=split(/\:/,$typename);
+               }
-         $storehash{$prefix.'.'.unescape($name)}=unescape($value);
+               unless (
- 	$storehash{$prefix.'.'.unescape($name).'.type'}=unescape($type);
+                  $metacache{$uri.':'.$unikey}=&HTML::Entities::decode($parser->get_text('/'.$entry))
-     } split(/\&/,$parms);
+ 		      ) { $metacache{$uri.':'.$unikey}=
-     &appenv(%storehash);
+ 			      $metacache{$uri.':'.$unikey.'.default'};
+ 		      }
+ # end of not-a-package not-a-library import
+ 	   }
+ # end of not-a-package start tag
+ 	  }
+ # the next is the end of "start tag"
+ 	 }
+        }
+        $metacache{$uri.':keys'}=join(',',keys %metathesekeys);
+        $metacache{$uri.':cachedtimestamp'}=time;
+ # this is the end of "was not already recently cached
+     }
+     return $metacache{$uri.':'.$what};
  }
  # ------------------------------------------------- Update symbolic store links
- Line 1351  sub symblist {
+ Line 2681  sub symblist {
      my %hash;
      if (($ENV{'request.course.fn'}) && (%newhash)) {
          if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
-                       &GDBM_WRCREAT,0640)) {
+                       &GDBM_WRCREAT(),0640)) {
- 	    map {
+ 	    foreach (keys %newhash) {
                  $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
-             } keys %newhash;
+             }
              if (untie(%hash)) {
  		return 'ok';
              }
- Line 1363  sub symblist {
+ Line 2693  sub symblist {
      return 'error';
  }
+ # --------------------------------------------------------------- Verify a symb
+ sub symbverify {
+     my ($symb,$thisfn)=@_;
+     $thisfn=&declutter($thisfn);
+ # direct jump to resource in page or to a sequence - will construct own symbs
+     if ($thisfn=~/\.(page|sequence)$/) { return 1; }
+ # check URL part
+     my ($map,$resid,$url)=split(/\_\_\_/,$symb);
+     unless (&symbclean($url) eq &symbclean($thisfn)) { return 0; }
+     $symb=&symbclean($symb);
+     my %bighash;
+     my $okay=0;
+     if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
+                             &GDBM_READER(),0640)) {
+         my $ids=$bighash{'ids_/res/'.$thisfn};
+         unless ($ids) {
+            $ids=$bighash{'ids_/'.$thisfn};
+         }
+         if ($ids) {
+ # ------------------------------------------------------------------- Has ID(s)
+ 	    foreach (split(/\,/,$ids)) {
+                my ($mapid,$resid)=split(/\./,$_);
+                if (
+   &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
+    eq $symb) {
+                   $okay=1;
+                }
+ 	   }
+         }
+ 	untie(%bighash);
+     }
+     return $okay;
+ }
+ # --------------------------------------------------------------- Clean-up symb
+ sub symbclean {
+     my $symb=shift;
+ # remove version from map
+     $symb=~s/\.(\d+)\.(\w+)\_\_\_/\.$2\_\_\_/;
+ # remove version from URL
+     $symb=~s/\.(\d+)\.(\w+)$/\.$2/;
+     return $symb;
+ }
  # ------------------------------------------------------ Return symb list entry
  sub symbread {
-     my $thisfn=shift;
+     my ($thisfn,$donotrecurse)=@_;
+ # no filename provided? try from environment
      unless ($thisfn) {
+         if ($ENV{'request.symb'}) { return &symbclean($ENV{'request.symb'}); }
  	$thisfn=$ENV{'request.filename'};
      }
+ # is that filename actually a symb? Verify, clean, and return
+     if ($thisfn=~/\_\_\_\d+\_\_\_(.*)$/) {
+ 	if (&symbverify($thisfn,$1)) { return &symbclean($thisfn); }
+     }
      $thisfn=declutter($thisfn);
      my %hash;
      my %bighash;
      my $syval='';
-     my $parms='';
      if (($ENV{'request.course.fn'}) && ($thisfn)) {
          if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
-                       &GDBM_READER,0640)) {
+                       &GDBM_READER(),0640)) {
  	    $syval=$hash{$thisfn};
              untie(%hash);
          }
- Line 1393  sub symbread {
+ Line 2779  sub symbread {
          } else {
  # ------------------------------------------------------- Was not in symb table
             if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
-                             &GDBM_READER,0640)) {
+                             &GDBM_READER(),0640)) {
  # ---------------------------------------------- Get ID(s) for current resource
                my $ids=$bighash{'ids_/res/'.$thisfn};
+               unless ($ids) {
+                  $ids=$bighash{'ids_/'.$thisfn};
+               }
+               unless ($ids) {
+ # alias?
+ 		  $ids=$bighash{'mapalias_'.$thisfn};
+               }
                if ($ids) {
  # ------------------------------------------------------------------- Has ID(s)
                   my @possibilities=split(/\,/,$ids);
                   if ($#possibilities==0) {
  # ----------------------------------------------- There is only one possibility
  		     my ($mapid,$resid)=split(/\./,$ids);
-                      $parms=$bighash{'param_'.$ids};
                       $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
-                  } else {
+                  } elsif (!$donotrecurse) {
  # ------------------------------------------ There is more than one possibility
                       my $realpossible=0;
-                      map {
+                      foreach (@possibilities) {
  			 my $file=$bighash{'src_'.$_};
                           if (&allowed('bre',$file)) {
           		    my ($mapid,$resid)=split(/\./,$_);
                              if ($bighash{'map_type_'.$mapid} ne 'page') {
  				$realpossible++;
-                                 $parms=$bighash{'param_'.$_};
                                  $syval=declutter($bighash{'map_id_'.$mapid}).
                                         '___'.$resid;
                              }
  			 }
-                      } @possibilities;
+                      }
  		     if ($realpossible!=1) { $syval=''; }
+                  } else {
+                      $syval='';
                   }
  	      }
                untie(%bighash)
             }
          }
          if ($syval) {
-            if ($parms) {
+            return &symbclean($syval.'___'.$thisfn);
- 	       &appendparms($syval.'___'.$thisfn,$parms);
-            }
-            return $syval.'___'.$thisfn;
          }
      }
      &appenv('request.ambiguous' => $thisfn);
- Line 1451  sub numval {
+ Line 2841  sub numval {
  }
  sub rndseed {
-     my $symb;
+     my ($symb,$courseid,$domain,$username)=@_;
-     unless ($symb=&symbread()) { return time; }
+     if (!$symb) {
-     my $symbchck=unpack("%32C*",$symb);
+       unless ($symb=&symbread()) { return time; }
-     my $symbseed=numval($symb)%$symbchck;
+     }
-     my $namechck=unpack("%32C*",$ENV{'user.name'});
+     if (!$courseid) { $courseid=$ENV{'request.course.id'};}
-     my $nameseed=numval($ENV{'user.name'})%$namechck;
+     if (!$domain) {$domain=$ENV{'user.domain'};}
-     return int( $symbseed
+     if (!$username) {$username=$ENV{'user.name'};}
- 	       .$nameseed
+     {
-                .unpack("%32C*",$ENV{'user.domain'})
+       use integer;
-                .unpack("%32C*",$ENV{'request.course.id'})
+       my $symbchck=unpack("%32C*",$symb) << 27;
-                .$namechck
+       my $symbseed=numval($symb) << 22;
-                .$symbchck);
+       my $namechck=unpack("%32C*",$username) << 17;
+       my $nameseed=numval($username) << 12;
+       my $domainseed=unpack("%32C*",$domain) << 7;
+       my $courseseed=unpack("%32C*",$courseid);
+       my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
+       #uncommenting these lines can break things!
+       #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
+       #&Apache::lonxml::debug("rndseed :$num:$symb");
+       return $num;
+     }
  }
+ sub ireceipt {
+     my ($funame,$fudom,$fucourseid,$fusymb)=@_;
+     my $cuname=unpack("%32C*",$funame);
+     my $cudom=unpack("%32C*",$fudom);
+     my $cucourseid=unpack("%32C*",$fucourseid);
+     my $cusymb=unpack("%32C*",$fusymb);
+     my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});
+     return unpack("%32C*",$perlvar{'lonHostID'}).'-'.
+            ($cunique%$cuname+
+             $cunique%$cudom+
+             $cusymb%$cuname+
+             $cusymb%$cudom+
+             $cucourseid%$cuname+
+             $cucourseid%$cudom);
+ }
+ sub receipt {
+     return &ireceipt($ENV{'user.name'},$ENV{'user.domain'},
+                      $ENV{'request.course.id'},&symbread());
+ }
  # ------------------------------------------------------------ Serves up a file
  # returns either the contents of the file or a -1
  sub getfile {
- Line 1500  sub filelocation {
+ Line 2920  sub filelocation {
  sub hreflocation {
      my ($dir,$file)=@_;
-     unless (($_=~/^http:\/\//i) || ($_=~/^\//)) {
+     unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {
         my $finalpath=filelocation($dir,$file);
         $finalpath=~s/^\/home\/httpd\/html//;
+        $finalpath=~s-/home/(\w+)/public_html/-/~$1/-;
         return $finalpath;
      } else {
         return $file;
- Line 1516  sub declutter {
+ Line 2937  sub declutter {
      $thisfn=~s/^$perlvar{'lonDocRoot'}//;
      $thisfn=~s/^\///;
      $thisfn=~s/^res\///;
+     $thisfn=~s/\?.+$//;
      return $thisfn;
  }
- Line 1537  sub unescape {
+ Line 2959  sub unescape {
  # ================================================================ Main Program
- sub BEGIN {
+ sub goodbye {
- if ($readit ne 'done') {
+    &logthis("Starting Shut down");
- # ------------------------------------------------------------ Read access.conf
+    &flushcourselogs();
+    &logthis("Shutting down");
+ }
+ BEGIN {
+ # ----------------------------------- Read loncapa.conf and loncapa_apache.conf
+     unless ($readit) {
+ {
+     my $config=Apache::File->new("/etc/httpd/conf/loncapa.conf");
+     while (my $configline=<$config>) {
+         if ($configline =~ /^[^\#]*PerlSetVar/) {
+ 	   my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
+            chomp($varvalue);
+            $perlvar{$varname}=$varvalue;
+         }
+     }
+ }
  {
-     my $config=Apache::File->new("/etc/httpd/conf/access.conf");
+     my $config=Apache::File->new("/etc/httpd/conf/loncapa_apache.conf");
      while (my $configline=<$config>) {
-         if ($configline =~ /PerlSetVar/) {
+         if ($configline =~ /^[^\#]*PerlSetVar/) {
  	   my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
             chomp($varvalue);
             $perlvar{$varname}=$varvalue;
- Line 1557  if ($readit ne 'done') {
+ Line 2996  if ($readit ne 'done') {
      my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
      while (my $configline=<$config>) {
-        my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
+        chomp($configline);
-        $hostname{$id}=$name;
+        my ($id,$domain,$role,$name,$ip,$domdescr)=split(/:/,$configline);
-        $hostdom{$id}=$domain;
+        if ($id && $domain && $role && $name && $ip) {
-        if ($role eq 'library') { $libserv{$id}=$name; }
+ 	 $hostname{$id}=$name;
+ 	 $hostdom{$id}=$domain;
+ 	 $hostip{$id}=$ip;
+ 	 if ($domdescr) { $domaindescription{$domain}=$domdescr; }
+ 	 if ($role eq 'library') { $libserv{$id}=$name; }
+        } else {
+ 	 if ($configline) {
+ 	   &logthis("Skipping hosts.tab line -$configline-");
+ 	 }
+        }
      }
  }
- Line 1581  if ($readit ne 'done') {
+ Line 3029  if ($readit ne 'done') {
      while (my $configline=<$config>) {
         chomp($configline);
+       if ($configline) {
         my ($role,$perm)=split(/ /,$configline);
         if ($perm ne '') { $pr{$role}=$perm; }
+       }
      }
  }
- Line 1592  if ($readit ne 'done') {
+ Line 3042  if ($readit ne 'done') {
      while (my $configline=<$config>) {
         chomp($configline);
+       if ($configline) {
         my ($short,$plain)=split(/:/,$configline);
         if ($plain ne '') { $prp{$short}=$plain; }
+       }
      }
  }
- # ------------------------------------------------------------- Read file types
+ # ---------------------------------------------------------- Read package table
  {
-     my $config=Apache::File->new("$perlvar{'lonTabDir'}/filetypes.tab");
+     my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");
      while (my $configline=<$config>) {
         chomp($configline);
-        my ($ending,$emb,@descr)=split(/\s+/,$configline);
+        my ($short,$plain)=split(/:/,$configline);
-        if ($descr[0] ne '') {
+        my ($pack,$name)=split(/\&/,$short);
-          $fe{$ending}=$emb;
+        if ($plain ne '') {
-          $fd{$ending}=join(' ',@descr);
+           $packagetab{$pack.'&'.$name.'&name'}=$name;
+           $packagetab{$short}=$plain;
         }
      }
  }
+ %metacache=();
- $readit='done';
+ $processmarker=$$.'_'.time.'_'.$perlvar{'lonHostID'};
+ $dumpcount=0;
+ &logtouch();
  &logthis('<font color=yellow>INFO: Read configuration</font>');
+ $readit=1;
  }
  }
 ;
+ __END__
+ =pod
+ =head1 NAME
+ Apache::lonnet - Subroutines to ask questions about things in the network.
+ =head1 SYNOPSIS
+ Invoked by other LON-CAPA modules, when they need to talk to or about objects in the network.
+  &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
+ Common parameters:
+ =over 4
+ =item *
+ $uname : an internal username (if $cname expecting a course Id specifically)
+ =item *
+ $udom : a domain (if $cdom expecting a course's domain specifically)
+ =item *
+ $symb : a resource instance identifier
+ =item *
+ $namespace : the name of a .db file that contains the data needed or
+ being set.
+ =back
+ =head1 INTRODUCTION
+ This module provides subroutines which interact with the
+ lonc/lond (TCP) network layer of LON-CAPA. And Can be used to ask about
+ - classes
+ - users
+ - resources
+ For many of these objects you can also use this to store data about
+ them or modify them in various ways.
+ This is part of the LearningOnline Network with CAPA project
+ described at http://www.lon-capa.org.
+ =head1 RETURN MESSAGES
+ =over 4
+ =item *
+ con_lost : unable to contact remote host
+ =item *
+ con_delayed : unable to contact remote host, message will be delivered
+ when the connection is brought back up
+ =item *
+ con_failed : unable to contact remote host and unable to save message
+ for later delivery
+ =item *
+ error: : an error a occured, a description of the error follows the :
+ =item *
+ no_such_host : unable to fund a host associated with the user/domain
+ that was requested
+ =back
+ =head1 PUBLIC SUBROUTINES
+ =head2 Session Environment Functions
+ =over 4
+ =item *
+ appenv(%hash) : the value of %hash is written to the user envirnoment
+ file, and will be restored for each access this user makes during this
+ session, also modifies the %ENV for the current process
+ =item *
+ delenv($regexp) : removes all items from the session environment file that matches the regular expression in $regexp. The values are also delted from the current processes %ENV.
+ =back
+ =head2 User Information
+ =over 4
+ =item *
+ queryauthenticate($uname,$udom) : try to determine user's current
+ authentication scheme
+ =item *
+ authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib
+ servers (first use the current one), $upass should be the users password
+ =item *
+ homeserver($uname,$udom) : find the server which has the user's
+ directory and files (there must be only one), this caches the answer,
+ and also caches if there is a borken connection.
+ =item *
+ idget($udom,@ids) : find the usernames behind a list of IDs (IDs are a
+ unique resource in a domain, there must be only 1 ID per username, and
+ only 1 username per ID in a specific domain) (returns hash:
+ id=>name,id=>name)
+ =item *
+ idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:
+ name=>id,name=>id)
+ =item *
+ idput($udom,%ids) : store away a list of names and associated IDs
+ =item *
+ rolesinit($udom,$username,$authhost) : get user privileges
+ =item *
+ usection($udom,$uname,$cname) : finds the section of student in the
+ course $cname, return section name/number or '' for "not in course"
+ and '-1' for "no section"
+ =item *
+ userenvironment($udom,$uname,@what) : gets the values of the keys
+ passed in @what from the requested user's environment, returns a hash
+ =back
+ =head2 User Roles
+ =over 4
+ =item *
+ allowed($priv,$uri) : check for a user privilege; returns codes for allowed
+ actions
+  F: full access
+  U,I,K: authentication modes (cxx only)
+  '': forbidden
+: user needs to choose course
+: browse allowed
+ =item *
+ definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
+ role rolename set privileges in format of lonTabs/roles.tab for system, domain,
+ and course level
+ =item *
+ plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
+ explanation of a user role term
+ =back
+ =head2 User Modification
+ =over 4
+ =item *
+ assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
+ user for the level given by URL.  Optional start and end dates (leave empty
+ string or zero for "no date")
+ =item *
+ changepass($uname,$udom,$currentpass,$newpass,$server) : attempts to
+ change a users, password, possible return values are: ok,
+ pwchange_failure, non_authorized, auth_mode_error, unknown_user,
+ refused
+ =item *
+ modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
+ =item *
+ modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) :
+ modify user
+ =item *
+ modifystudent($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,$end,$start) : modify student
+ =item *
+ assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
+ custom role; give a custom role to a user for the level given by URL.  Specify
+ name and domain of role author, and role name
+ =item *
+ revokerole($udom,$uname,$url,$role) : revoke a role for url
+ =item *
+ revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
+ =back
+ =head2 Course Infomation
+ =over 4
+ =item *
+ coursedescription($courseid) : course description
+ =item *
+ courseresdata($coursenum,$coursedomain,@which) : request for current
+ parameter setting for a specific course, @what should be a list of
+ parameters to ask about. This routine caches answers for 5 minutes.
+ =back
+ =head2 Course Modification
+ =over 4
+ =item *
+ writecoursepref($courseid,%prefs) : write preferences (environment
+ database) for a course
+ =item *
+ createcourse($udom,$description,$url) : make/modify course
+ =back
+ =head2 Resource Subroutines
+ =over 4
+ =item *
+ subscribe($fname) : subscribe to a resource, returns URL if possible (probably should use repcopy instead)
+ =item *
+ repcopy($filename) : subscribes to the requested file, and attempts to
+ replicate from the owning library server, Might return
+ HTTP_SERVICE_UNAVAILABLE, HTTP_NOT_FOUND, FORBIDDEN, OK, or
+ HTTP_BAD_REQUEST, also attempts to grab the metadata for the
+ resource. Expects the local filesystem pathname
+ (/home/httpd/html/res/....)
+ =back
+ =head2 Resource Information
+ =over 4
+ =item *
+ EXT($varname,$symb,$udom,$uname) : evaluates and returns the value of
+ a vairety of different possible values, $varname should be a request
+ string, and the other parameters can be used to specify who and what
+ one is asking about.
+ Possible values for $varname are environment.lastname (or other item
+ from the envirnment hash), user.name (or someother aspect about the
+ user), resource.0.maxtries (or some other part and parameter of a
+ resource)
+ =item *
+ directcondval($number) : get current value of a condition; reads from a state
+ string
+ =item *
+ condval($condidx) : value of condition index based on state
+ =item *
+ metadata($uri,$what,$liburi,$prefix,$depthcount) : request a
+ resource's metadata, $what should be either a specific key, or either
+ 'keys' (to get a list of possible keys) or 'packages' to get a list of
+ packages that this resource currently uses, the last 3 arguments are only used internally for recursive metadata.
+ this function automatically caches all requests
+ =item *
+ metadata_query($query,$custom,$customshow) : make a metadata query against the
+ network of library servers; returns file handle of where SQL and regex results
+ will be stored for query
+ =item *
+ symbread($filename) : return symbolic list entry (filename argument optional);
+ returns the data handle
+ =item *
+ symbverify($symb,$thisfn) : verifies that $symb actually exists and is
+ a possible symb for the URL in $thisfn, returns a 1 on success, 0 on
+ failure, user must be in a course, as it assumes the existance of the
+ course initi hash, and uses $ENV('request.course.id'}
+ =item *
+ symbclean($symb) : removes versions numbers from a symb, returns the
+ cleaned symb
+ =item *
+ is_on_map($uri) : checks if the $uri is somewhere on the current
+ course map, user must be in a course for it to work.
+ =item *
+ numval($salt) : return random seed value (addend for rndseed)
+ =item *
+ rndseed($symb,$courseid,$udom,$uname) : create a random sum; returns
+ a random seed, all arguments are optional, if they aren't sent it uses the
+ environment to derive them. Note: if symb isn't sent and it can't get one
+ from &symbread it will use the current time as its return value
+ =item *
+ ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
+ unfakeable, receipt
+ =item *
+ receipt() : API to ireceipt working off of ENV values; given out to users
+ =item *
+ countacc($url) : count the number of accesses to a given URL
+ =item *
+ checkout($symb,$tuname,$tudom,$tcrsid) :  creates a record of a user having looked at an item, most likely printed out or otherwise using a resource
+ =item *
+ checkin($token) : updates that a resource has beeen returned (a hard copy version for instance) and returns the data that $token was Checkout with ($symb, $tuname, $tudom, and $tcrsid)
+ =item *
+ expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
+ =item *
+ devalidate($symb) : devalidate temporary spreadsheet calculations,
+ forcing spreadsheet to reevaluate the resource scores next time.
+ =back
+ =head2 Storing/Retreiving Data
+ =over 4
+ =item *
+ store($storehash,$symb,$namespace,$udom,$uname) : stores hash permanently
+ for this url; hashref needs to be given and should be a \%hashname; the
+ remaining args aren't required and if they aren't passed or are '' they will
+ be derived from the ENV
+ =item *
+ cstore($storehash,$symb,$namespace,$udom,$uname) : same as store but
+ uses critical subroutine
+ =item *
+ restore($symb,$namespace,$udom,$uname) : returns hash for this symb;
+ all args are optional
+ =item *
+ tmpstore($storehash,$symb,$namespace,$udom,$uname) : storage that
+ works very similar to store/cstore, but all data is stored in a
+ temporary location and can be reset using tmpreset, $storehash should
+ be a hash reference, returns nothing on success
+ =item *
+ tmprestore($symb,$namespace,$udom,$uname) : storage that works very
+ similar to restore, but all data is stored in a temporary location and
+ can be reset using tmpreset. Returns a hash of values on success,
+ error string otherwise.
+ =item *
+ tmpreset($symb,$namespace,$udom,$uname) : temporary storage reset,
+ deltes all keys for $symb form the temporary storage hash.
+ =item *
+ get($namespace,$storearr,$udom,$uname) : returns hash with keys from array
+ reference filled in from namesp ($udom and $uname are optional)
+ =item *
+ del($namespace,$storearr,$udom,$uname) : deletes keys out of array from
+ namesp ($udom and $uname are optional)
+ =item *
+ dump($namespace,$udom,$uname,$regexp) :
+ dumps the complete (or key matching regexp) namespace into a hash
+ ($udom, $uname and $regexp are optional)
+ =item *
+ put($namespace,$storehash,$udom,$uname) : stores hash in namesp
+ ($udom and $uname are optional)
+ =item *
+ cput($namespace,$storehash,$udom,$uname) : critical put
+ ($udom and $uname are optional)
+ =item *
+ eget($namespace,$storearr,$udom,$uname) : returns hash with keys from array
+ reference filled in from namesp (encrypts the return communication)
+ ($udom and $uname are optional)
+ =item *
+ log($udom,$name,$home,$message) : write to permanent log for user; use
+ critical subroutine
+ =back
+ =head2 Network Status Functions
+ =over 4
+ =item *
+ dirlist($uri) : return directory list based on URI
+ =item *
+ spareserver() : find server with least workload from spare.tab
+ =back
+ =head2 Apache Request
+ =over 4
+ =item *
+ ssi($url,%hash) : server side include, does a complete request cycle on url to
+ localhost, posts hash
+ =back
+ =head2 Data to String to Data
+ =over 4
+ =item *
+ hash2str(%hash) : convert a hash into a string complete with escaping and '='
+ and '&' separators, supports elements that are arrayrefs and hashrefs
+ =item *
+ hashref2str($hashref) : convert a hashref into a string complete with
+ escaping and '=' and '&' separators, supports elements that are
+ arrayrefs and hashrefs
+ =item *
+ arrayref2str($arrayref) : convert an arrayref into a string complete
+ with escaping and '&' separators, supports elements that are arrayrefs
+ and hashrefs
+ =item *
+ str2hash($string) : convert string to hash using unescaping and
+ splitting on '=' and '&', supports elements that are arrayrefs and
+ hashrefs
+ =item *
+ str2array($string) : convert string to hash using unescaping and
+ splitting on '&', supports elements that are arrayrefs and hashrefs
+ =back
+ =head2 Logging Routines
+ =over 4
+ These routines allow one to make log messages in the lonnet.log and
+ lonnet.perm logfiles.
+ =item *
+ logtouch() : make sure the logfile, lonnet.log, exists
+ =item *
+ logthis() : append message to the normal lonnet.log file, it gets
+ preiodically rolled over and deleted.
+ =item *
+ logperm() : append a permanent message to lonnet.perm.log, this log
+ file never gets deleted by any automated portion of the system, only
+ messages of critical importance should go in here.
+ =back
+ =head2 General File Helper Routines
+ =over 4
+ =item *
+ getfile($file) : returns the entire contents of a file or -1; it
+ properly subscribes to and replicates the file if neccessary.
+ =item *
+ filelocation($dir,$file) : returns file system location of a file
+ based on URI; meant to be "fairly clean" absolute reference, $dir is a
+ directory that relative $file lookups are to looked in ($dir of /a/dir
+ and a file of ../bob will become /a/bob)
+ =item *
+ hreflocation($dir,$file) : returns file system location or a URL; same as
+ filelocation except for hrefs
+ =item *
+ declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
+ =back
+ =head2 HTTP Helper Routines
+ =over 4
+ =item *
+ escape() : unpack non-word characters into CGI-compatible hex codes
+ =item *
+ unescape() : pack CGI-compatible hex codes into actual non-word ASCII character
+ =back
+ =head1 PRIVATE SUBROUTINES
+ =head2 Underlying communication routines (Shouldn't call)
+ =over 4
+ =item *
+ subreply() : tries to pass a message to lonc, returns con_lost if incapable
+ =item *
+ reply() : uses subreply to send a message to remote machine, logs all failures
+ =item *
+ critical() : passes a critical message to another server; if cannot
+ get through then place message in connection buffer directory and
+ returns con_delayed, if incapable of saving message, returns
+ con_failed
+ =item *
+ reconlonc() : tries to reconnect lonc client processes.
+ =back
+ =head2 Resource Access Logging
+ =over 4
+ =item *
+ flushcourselogs() : flush (save) buffer logs and access logs
+ =item *
+ courselog($what) : save message for course in hash
+ =item *
+ courseacclog($what) : save message for course using &courselog().  Perform
+ special processing for specific resource types (problems, exams, quizzes, etc).
+ =item *
+ goodbye() : flush course logs and log shutting down; it is called in srm.conf
+ as a PerlChildExitHandler
+ =back
+ =head2 Other
+ =over 4
+ =item *
+ symblist($mapname,%newhash) : update symbolic storage links
+ =back
+ =cut

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