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Diff for /loncom/lonnet/perl/lonnet.pm between versions 1.198 and 1.567

version 1.198, 2002/01/04 18:12:23 version 1.567, 2004/11/10 19:03:04
Line 25 Line 25
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,  
 # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,  
 # 11/8,11/16,11/18,11/22,11/23,12/22,  
 # 01/06,01/13,02/24,02/28,02/29,  
 # 03/01,03/02,03/06,03/07,03/13,  
 # 04/05,05/29,05/31,06/01,  
 # 06/05,06/26 Gerd Kortemeyer  
 # 06/26 Ben Tyszka  
 # 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer  
 # 08/14 Ben Tyszka  
 # 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer  
 # 10/04 Gerd Kortemeyer  
 # 10/04 Guy Albertelli  
 # 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29,   
 # 10/30,10/31,  
 # 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,  
 # 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer  
 # 05/01/01 Guy Albertelli  
 # 05/01,06/01,09/01 Gerd Kortemeyer  
 # 09/01 Guy Albertelli  
 # 09/01,10/01,11/01 Gerd Kortemeyer  
 # YEAR=2001  
 # 02/27/01 Scott Harrison  
 # 3/2 Gerd Kortemeyer  
 # 3/15,3/19 Scott Harrison  
 # 3/19,3/20 Gerd Kortemeyer  
 # 3/22,3/27,4/2,4/16,4/17 Scott Harrison  
 # 5/26,5/28 Gerd Kortemeyer  
 # 5/30 H. K. Ng  
 # 6/1 Gerd Kortemeyer  
 # July Guy Albertelli  
 # 8/4,8/7,8/8,8/9,8/11,8/16,8/17,8/18,8/20,8/23,9/20,9/21,9/26,  
 # 10/2 Gerd Kortemeyer  
 # 10/5,10/10,11/13,11/15 Scott Harrison  
 # 11/17,11/20,11/22,11/29 Gerd Kortemeyer  
 # 12/5 Matthew Hall  
 # 12/5 Guy Albertelli  
 # 12/6,12/7,12/12 Gerd Kortemeyer  
 # 12/18 Scott Harrison  
 # 12/21,12/22,12/27,12/28 Gerd Kortemeyer  
 # YEAR=2002  
 # 1/4 Gerd Kortemeyer  
 #  
 ###  ###
   
 package Apache::lonnet;  package Apache::lonnet;
   
 use strict;  use strict;
 use Apache::File;  
 use LWP::UserAgent();  use LWP::UserAgent();
 use HTTP::Headers;  use HTTP::Headers;
   use HTTP::Date;
   # use Date::Parse;
 use vars   use vars 
 qw(%perlvar %hostname %homecache %hostip %spareid %hostdom   qw(%perlvar %hostname %homecache %badServerCache %hostip %iphost %spareid %hostdom 
    %libserv %pr %prp %metacache %packagetab      %libserv %pr %prp %metacache %packagetab %titlecache %courseresversioncache %resversioncache
    %courselogs %accesshash $processmarker $dumpcount      %courselogs %accesshash %userrolehash $processmarker $dumpcount 
    %coursedombuf %coursehombuf);     %coursedombuf %coursenumbuf %coursehombuf %coursedescrbuf %courseinstcodebuf %courseresdatacache 
      %userresdatacache %getsectioncache %domaindescription %domain_auth_def %domain_auth_arg_def 
      %domain_lang_def %domain_city %domain_longi %domain_lati $tmpdir $_64bit);
   
 use IO::Socket;  use IO::Socket;
 use GDBM_File;  use GDBM_File;
 use Apache::Constants qw(:common :http);  use Apache::Constants qw(:common :http);
 use HTML::TokeParser;  use HTML::LCParser;
 use Fcntl qw(:flock);  use Fcntl qw(:flock);
   use Apache::lonlocal;
   use Storable qw(lock_store lock_nstore lock_retrieve freeze thaw nfreeze);
   use Time::HiRes qw( gettimeofday tv_interval );
 my $readit;  my $readit;
   my $max_connection_retries = 10;     # Or some such value.
   
   =pod
   
   =head1 Package Variables
   
   These are largely undocumented, so if you decipher one please note it here.
   
   =over 4
   
   =item $processmarker
   
   Contains the time this process was started and this servers host id.
   
   =item $dumpcount
   
   Counts the number of times a message log flush has been attempted (regardless
   of success) by this process.  Used as part of the filename when messages are
   delayed.
   
   =back
   
   =cut
   
   
 # --------------------------------------------------------------------- Logging  # --------------------------------------------------------------------- Logging
   
 sub logtouch {  sub logtouch {
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     unless (-e "$execdir/logs/lonnet.log") {      unless (-e "$execdir/logs/lonnet.log") {
  my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");   open(my $fh,">>$execdir/logs/lonnet.log");
  close $fh;   close $fh;
     }      }
     my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];      my ($wwwuid,$wwwgid)=(getpwnam('www'))[2,3];
Line 105  sub logthis { Line 93  sub logthis {
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");      if (open(my $fh,">>$execdir/logs/lonnet.log")) {
     print $fh "$local ($$): $message\n";   print $fh "$local ($$): $message\n";
    close($fh);
       }
     return 1;      return 1;
 }  }
   
Line 115  sub logperm { Line 105  sub logperm {
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");      if (open(my $fh,">>$execdir/logs/lonnet.perm.log")) {
     print $fh "$now:$message:$local\n";   print $fh "$now:$message:$local\n";
    close($fh);
       }
     return 1;      return 1;
 }  }
   
Line 124  sub logperm { Line 116  sub logperm {
 sub subreply {  sub subreply {
     my ($cmd,$server)=@_;      my ($cmd,$server)=@_;
     my $peerfile="$perlvar{'lonSockDir'}/$server";      my $peerfile="$perlvar{'lonSockDir'}/$server";
     my $client=IO::Socket::UNIX->new(Peer    =>"$peerfile",      #
                                      Type    => SOCK_STREAM,      #  With loncnew process trimming, there's a timing hole between lonc server
                                      Timeout => 10)      #  process exit and the master server picking up the listen on the AF_UNIX
        or return "con_lost";      #  socket.  In that time interval, a lock file will exist:
     print $client "$cmd\n";  
     my $answer=<$client>;      my $lockfile=$peerfile.".lock";
     if (!$answer) { $answer="con_lost"; }      while (-e $lockfile) { # Need to wait for the lockfile to disappear.
     chomp($answer);   sleep(1);
       }
       # At this point, either a loncnew parent is listening or an old lonc
       # or loncnew child is listening so we can connect or everything's dead.
       #
       #   We'll give the connection a few tries before abandoning it.  If
       #   connection is not possible, we'll con_lost back to the client.
       #   
       my $client;
       for (my $retries = 0; $retries < $max_connection_retries; $retries++) {
    $client=IO::Socket::UNIX->new(Peer    =>"$peerfile",
         Type    => SOCK_STREAM,
         Timeout => 10);
    if($client) {
       last; # Connected!
    }
    sleep(1); # Try again later if failed connection.
       }
       my $answer;
       if ($client) {
    print $client "$cmd\n";
    $answer=<$client>;
    if (!$answer) { $answer="con_lost"; }
    chomp($answer);
       } else {
    $answer = 'con_lost'; # Failed connection.
       }
     return $answer;      return $answer;
 }  }
   
 sub reply {  sub reply {
     my ($cmd,$server)=@_;      my ($cmd,$server)=@_;
       unless (defined($hostname{$server})) { return 'no_such_host'; }
     my $answer=subreply($cmd,$server);      my $answer=subreply($cmd,$server);
     if ($answer eq 'con_lost') { $answer=subreply($cmd,$server); }      if ($answer eq 'con_lost') {
           #sleep 5; 
           #$answer=subreply($cmd,$server);
           #if ($answer eq 'con_lost') {
    #   &logthis("Second attempt con_lost on $server");
           #   my $peerfile="$perlvar{'lonSockDir'}/$server";
           #   my $client=IO::Socket::UNIX->new(Peer    =>"$peerfile",
           #                                    Type    => SOCK_STREAM,
           #                                    Timeout => 10)
           #              or return "con_lost";
           #   &logthis("Killing socket");
           #   print $client "close_connection_exit\n";
              #sleep 5;
           #   $answer=subreply($cmd,$server);       
          #}   
       }
     if (($answer=~/^refused/) || ($answer=~/^rejected/)) {      if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
        &logthis("<font color=blue>WARNING:".         &logthis("<font color=blue>WARNING:".
                 " $cmd to $server returned $answer</font>");                  " $cmd to $server returned $answer</font>");
Line 152  sub reconlonc { Line 186  sub reconlonc {
     my $peerfile=shift;      my $peerfile=shift;
     &logthis("Trying to reconnect for $peerfile");      &logthis("Trying to reconnect for $peerfile");
     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";      my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
     if (my $fh=Apache::File->new("$loncfile")) {      if (open(my $fh,"<$loncfile")) {
  my $loncpid=<$fh>;   my $loncpid=<$fh>;
         chomp($loncpid);          chomp($loncpid);
         if (kill 0 => $loncpid) {          if (kill 0 => $loncpid) {
Line 197  sub critical { Line 231  sub critical {
             $middlename=substr($middlename,0,16);              $middlename=substr($middlename,0,16);
             $middlename=~s/\W//g;              $middlename=~s/\W//g;
             my $dfilename=              my $dfilename=
              "$perlvar{'lonSockDir'}/delayed/$now.$middlename.$server";        "$perlvar{'lonSockDir'}/delayed/$now.$dumpcount.$$.$middlename.$server";
               $dumpcount++;
             {              {
              my $dfh;   my $dfh;
              if ($dfh=Apache::File->new(">$dfilename")) {   if (open($dfh,">$dfilename")) {
                 print $dfh "$cmd\n";      print $dfh "$cmd\n"; 
      }      close($dfh);
    }
             }              }
             sleep 2;              sleep 2;
             my $wcmd='';              my $wcmd='';
             {              {
      my $dfh;   my $dfh;
              if ($dfh=Apache::File->new("$dfilename")) {   if (open($dfh,"<$dfilename")) {
                 $wcmd=<$dfh>;      $wcmd=<$dfh>; 
      }      close($dfh);
    }
             }              }
             chomp($wcmd);              chomp($wcmd);
             if ($wcmd eq $cmd) {              if ($wcmd eq $cmd) {
Line 229  sub critical { Line 266  sub critical {
     return $answer;      return $answer;
 }  }
   
   #
   # -------------- Remove all key from the env that start witha lowercase letter
   #                (Which is always a lon-capa value)
   
   sub cleanenv {
   #    unless (defined(&Apache::exists_config_define("MODPERL2"))) { return; }
   #    unless (&Apache::exists_config_define("MODPERL2")) { return; }
       foreach my $key (keys(%ENV)) {
    if ($key =~ /^[a-z]/) {
       delete($ENV{$key});
    }
       }
   }
    
   # ------------------------------------------- Transfer profile into environment
   
   sub transfer_profile_to_env {
       my ($lonidsdir,$handle)=@_;
       my @profile;
       {
    open(my $idf,"$lonidsdir/$handle.id");
    flock($idf,LOCK_SH);
    @profile=<$idf>;
    close($idf);
       }
       my $envi;
       my %Remove;
       for ($envi=0;$envi<=$#profile;$envi++) {
    chomp($profile[$envi]);
    my ($envname,$envvalue)=split(/=/,$profile[$envi]);
    $ENV{$envname} = $envvalue;
           if (my ($key,$time) = ($envname =~ /^(cgi\.(\d+)_\d+\.)/)) {
               if ($time < time-300) {
                   $Remove{$key}++;
               }
           }
       }
       $ENV{'user.environment'} = "$lonidsdir/$handle.id";
       foreach my $expired_key (keys(%Remove)) {
           &delenv($expired_key);
       }
   }
   
 # ---------------------------------------------------------- Append Environment  # ---------------------------------------------------------- Append Environment
   
 sub appenv {  sub appenv {
Line 245  sub appenv { Line 325  sub appenv {
     }      }
   
     my $lockfh;      my $lockfh;
     unless ($lockfh=Apache::File->new("$ENV{'user.environment'}")) {      unless (open($lockfh,"$ENV{'user.environment'}")) {
        return 'error: '.$!;   return 'error: '.$!;
     }      }
     unless (flock($lockfh,LOCK_EX)) {      unless (flock($lockfh,LOCK_EX)) {
          &logthis("<font color=blue>WARNING: ".           &logthis("<font color=blue>WARNING: ".
                   'Could not obtain exclusive lock in appenv: '.$!);                    'Could not obtain exclusive lock in appenv: '.$!);
          $lockfh->close();           close($lockfh);
          return 'error: '.$!;           return 'error: '.$!;
     }      }
   
     my @oldenv;      my @oldenv;
     {      {
      my $fh;   my $fh;
      unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {   unless (open($fh,"$ENV{'user.environment'}")) {
  return 'error: '.$!;      return 'error: '.$!;
      }   }
      @oldenv=<$fh>;   @oldenv=<$fh>;
      $fh->close();   close($fh);
     }      }
     for (my $i=0; $i<=$#oldenv; $i++) {      for (my $i=0; $i<=$#oldenv; $i++) {
         chomp($oldenv[$i]);          chomp($oldenv[$i]);
         if ($oldenv[$i] ne '') {          if ($oldenv[$i] ne '') {
            my ($name,$value)=split(/=/,$oldenv[$i]);      my ($name,$value)=split(/=/,$oldenv[$i]);
            unless (defined($newenv{$name})) {      unless (defined($newenv{$name})) {
       $newenv{$name}=$value;   $newenv{$name}=$value;
    }      }
         }          }
     }      }
     {      {
      my $fh;   my $fh;
      unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {   unless (open($fh,">$ENV{'user.environment'}")) {
  return 'error';      return 'error';
      }   }
      my $newname;   my $newname;
      foreach $newname (keys %newenv) {   foreach $newname (keys %newenv) {
  print $fh "$newname=$newenv{$newname}\n";      print $fh "$newname=$newenv{$newname}\n";
      }   }
      $fh->close();   close($fh);
     }      }
   
     $lockfh->close();      close($lockfh);
     return 'ok';      return 'ok';
 }  }
 # ----------------------------------------------------- Delete from Environment  # ----------------------------------------------------- Delete from Environment
Line 300  sub delenv { Line 380  sub delenv {
     }      }
     my @oldenv;      my @oldenv;
     {      {
      my $fh;   my $fh;
      unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {   unless (open($fh,"$ENV{'user.environment'}")) {
  return 'error';      return 'error';
      }   }
      unless (flock($fh,LOCK_SH)) {   unless (flock($fh,LOCK_SH)) {
          &logthis("<font color=blue>WARNING: ".      &logthis("<font color=blue>WARNING: ".
                   'Could not obtain shared lock in delenv: '.$!);       'Could not obtain shared lock in delenv: '.$!);
          $fh->close();      close($fh);
          return 'error: '.$!;      return 'error: '.$!;
      }   }
      @oldenv=<$fh>;   @oldenv=<$fh>;
      $fh->close();   close($fh);
     }      }
     {      {
      my $fh;   my $fh;
      unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {   unless (open($fh,">$ENV{'user.environment'}")) {
  return 'error';      return 'error';
      }   }
      unless (flock($fh,LOCK_EX)) {   unless (flock($fh,LOCK_EX)) {
          &logthis("<font color=blue>WARNING: ".      &logthis("<font color=blue>WARNING: ".
                   'Could not obtain exclusive lock in delenv: '.$!);       'Could not obtain exclusive lock in delenv: '.$!);
          $fh->close();      close($fh);
          return 'error: '.$!;      return 'error: '.$!;
      }   }
      foreach (@oldenv) {   foreach (@oldenv) {
  unless ($_=~/^$delthis/) { print $fh $_; }      if ($_=~/^$delthis/) { 
      }                  my ($key,undef) = split('=',$_);
      $fh->close();                  delete($ENV{$key});
               } else {
                   print $fh $_; 
               }
    }
    close($fh);
     }      }
     return 'ok';      return 'ok';
 }  }
   
   # ------------------------------------------ Find out current server userload
   # there is a copy in lond
   sub userload {
       my $numusers=0;
       {
    opendir(LONIDS,$perlvar{'lonIDsDir'});
    my $filename;
    my $curtime=time;
    while ($filename=readdir(LONIDS)) {
       if ($filename eq '.' || $filename eq '..') {next;}
       my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
       if ($curtime-$mtime < 1800) { $numusers++; }
    }
    closedir(LONIDS);
       }
       my $userloadpercent=0;
       my $maxuserload=$perlvar{'lonUserLoadLim'};
       if ($maxuserload) {
    $userloadpercent=100*$numusers/$maxuserload;
       }
       $userloadpercent=sprintf("%.2f",$userloadpercent);
       return $userloadpercent;
   }
   
   # ------------------------------------------ Fight off request when overloaded
   
   sub overloaderror {
       my ($r,$checkserver)=@_;
       unless ($checkserver) { $checkserver=$perlvar{'lonHostID'}; }
       my $loadavg;
       if ($checkserver eq $perlvar{'lonHostID'}) {
          open(my $loadfile,'/proc/loadavg');
          $loadavg=<$loadfile>;
          $loadavg =~ s/\s.*//g;
          $loadavg = 100*$loadavg/$perlvar{'lonLoadLim'};
          close($loadfile);
       } else {
          $loadavg=&reply('load',$checkserver);
       }
       my $overload=$loadavg-100;
       if ($overload>0) {
    $r->err_headers_out->{'Retry-After'}=$overload;
           $r->log_error('Overload of '.$overload.' on '.$checkserver);
           return 413;
       }    
       return '';
   }
   
 # ------------------------------ Find server with least workload from spare.tab  # ------------------------------ Find server with least workload from spare.tab
   
 sub spareserver {  sub spareserver {
       my ($loadpercent,$userloadpercent) = @_;
     my $tryserver;      my $tryserver;
     my $spareserver='';      my $spareserver='';
     my $lowestserver=100;      if ($userloadpercent !~ /\d/) { $userloadpercent=0; }
       my $lowestserver=$loadpercent > $userloadpercent?
                $loadpercent :  $userloadpercent;
     foreach $tryserver (keys %spareid) {      foreach $tryserver (keys %spareid) {
        my $answer=reply('load',$tryserver);   my $loadans=reply('load',$tryserver);
        if (($answer =~ /\d/) && ($answer<$lowestserver)) {   my $userloadans=reply('userload',$tryserver);
    $spareserver="http://$hostname{$tryserver}";   if ($loadans !~ /\d/ && $userloadans !~ /\d/) {
            $lowestserver=$answer;      next; #didn't get a number from the server
        }   }
     }       my $answer;
    if ($loadans =~ /\d/) {
       if ($userloadans =~ /\d/) {
    #both are numbers, pick the bigger one
    $answer=$loadans > $userloadans?
       $loadans :  $userloadans;
       } else {
    $answer = $loadans;
       }
    } else {
       $answer = $userloadans;
    }
    if (($answer =~ /\d/) && ($answer<$lowestserver)) {
       $spareserver="http://$hostname{$tryserver}";
       $lowestserver=$answer;
    }
       }
     return $spareserver;      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  # ----------------------- Try to determine user's current authentication scheme
   
 sub queryauthenticate {  sub queryauthenticate {
     my ($uname,$udom)=@_;      my ($uname,$udom)=@_;
     if (($perlvar{'lonRole'} eq 'library') &&       my $uhome=&homeserver($uname,$udom);
         ($udom eq $perlvar{'lonDefDomain'})) {      if (!$uhome) {
  my $answer=reply("encrypt:currentauth:$udom:$uname",   &logthis("User $uname at $udom is unknown when looking for authentication mechanism");
  $perlvar{'lonHostID'});   return 'no_host';
  unless ($answer eq 'unknown_user' or $answer eq 'refused') {      }
     if (length($answer)) {      my $answer=reply("encrypt:currentauth:$udom:$uname",$uhome);
  return $answer;      if ($answer =~ /^(unknown_user|refused|con_lost)/) {
     }   &logthis("User $uname at $udom threw error $answer when checking authentication mechanism");
     else {  
  &logthis("User $uname at $udom lacks an authentication mechanism");  
  return 'no_host';  
     }  
  }  
     }  
   
     my $tryserver;  
     foreach $tryserver (keys %libserv) {  
  if ($hostdom{$tryserver} eq $udom) {  
            my $answer=reply("encrypt:currentauth:$udom:$uname",$tryserver);  
    unless ($answer eq 'unknown_user' or $answer eq 'refused') {  
        if (length($answer)) {  
    return $answer;  
        }  
        else {  
    &logthis("User $uname at $udom lacks an authentication mechanism");  
    return 'no_host';  
        }  
    }  
        }  
     }      }
     &logthis("User $uname at $udom lacks an authentication mechanism");          return $answer;
     return 'no_host';  
 }  }
   
 # --------- Try to authenticate user from domain's lib servers (first this one)  # --------- Try to authenticate user from domain's lib servers (first this one)
Line 391  sub queryauthenticate { Line 556  sub queryauthenticate {
 sub authenticate {  sub authenticate {
     my ($uname,$upass,$udom)=@_;      my ($uname,$upass,$udom)=@_;
     $upass=escape($upass);      $upass=escape($upass);
     if (($perlvar{'lonRole'} eq 'library') &&       $uname=~s/\W//g;
         ($udom eq $perlvar{'lonDefDomain'})) {      my $uhome=&homeserver($uname,$udom);
     my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});      if (!$uhome) {
         if ($answer =~ /authorized/) {   &logthis("User $uname at $udom is unknown in authenticate");
               if ($answer eq 'authorized') {   return 'no_host';
                  &logthis("User $uname at $udom authorized by local server");       }
                  return $perlvar{'lonHostID'};       my $answer=reply("encrypt:auth:$udom:$uname:$upass",$uhome);
               }      if ($answer eq 'authorized') {
               if ($answer eq 'non_authorized') {   &logthis("User $uname at $udom authorized by $uhome"); 
                  &logthis("User $uname at $udom rejected by local server");    return $uhome; 
                  return 'no_host';       }
               }      if ($answer eq 'non_authorized') {
  }   &logthis("User $uname at $udom rejected by $uhome");
     }   return 'no_host'; 
   
     my $tryserver;  
     foreach $tryserver (keys %libserv) {  
  if ($hostdom{$tryserver} eq $udom) {  
            my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);  
            if ($answer =~ /authorized/) {  
               if ($answer eq 'authorized') {  
                  &logthis("User $uname at $udom authorized by $tryserver");   
                  return $tryserver;   
               }  
               if ($answer eq 'non_authorized') {  
                  &logthis("User $uname at $udom rejected by $tryserver");  
                  return 'no_host';  
               }   
    }  
        }  
     }      }
     &logthis("User $uname at $udom could not be authenticated");          &logthis("User $uname at $udom threw error $answer when checking authentication mechanism");
     return 'no_host';      return 'no_host';
 }  }
   
 # ---------------------- Find the homebase for a user from domain's lib servers  # ---------------------- Find the homebase for a user from domain's lib servers
   
 sub homeserver {  sub homeserver {
     my ($uname,$udom)=@_;      my ($uname,$udom,$ignoreBadCache)=@_;
   
     my $index="$uname:$udom";      my $index="$uname:$udom";
     if ($homecache{$index}) { return "$homecache{$index}"; }  
   
       my ($result,$cached)=&is_cached(\%homecache,$index,'home',86400);
       if (defined($cached)) { return $result; }
     my $tryserver;      my $tryserver;
     foreach $tryserver (keys %libserv) {      foreach $tryserver (keys %libserv) {
           next if ($ignoreBadCache ne 'true' && 
    exists($badServerCache{$tryserver}));
  if ($hostdom{$tryserver} eq $udom) {   if ($hostdom{$tryserver} eq $udom) {
            my $answer=reply("home:$udom:$uname",$tryserver);             my $answer=reply("home:$udom:$uname",$tryserver);
            if ($answer eq 'found') {              if ($answer eq 'found') { 
       $homecache{$index}=$tryserver;         return &do_cache(\%homecache,$index,$tryserver,'home');
               return $tryserver;              } elsif ($answer eq 'no_host') {
    }         $badServerCache{$tryserver}=1;
              }
        }         }
     }          }    
     return 'no_host';      return 'no_host';
Line 491  sub idput { Line 643  sub idput {
     my ($udom,%ids)=@_;      my ($udom,%ids)=@_;
     my %servers=();      my %servers=();
     foreach (keys %ids) {      foreach (keys %ids) {
    &cput('environment',{'id'=>$ids{$_}},$udom,$_);
         my $uhom=&homeserver($_,$udom);          my $uhom=&homeserver($_,$udom);
         if ($uhom ne 'no_host') {          if ($uhom ne 'no_host') {
             my $id=&escape($ids{$_});              my $id=&escape($ids{$_});
Line 501  sub idput { Line 654  sub idput {
             } else {              } else {
                 $servers{$uhom}=$id.'='.$unam;                  $servers{$uhom}=$id.'='.$unam;
             }              }
             &critical('put:'.$udom.':'.$unam.':environment:id='.$id,$uhom);  
         }          }
     }      }
     foreach (keys %servers) {      foreach (keys %servers) {
Line 509  sub idput { Line 661  sub idput {
     }      }
 }  }
   
   # --------------------------------------------------- Assign a key to a student
   
   sub assign_access_key {
   #
   # a valid key looks like uname:udom#comments
   # comments are being appended
   #
       my ($ckey,$kdom,$knum,$cdom,$cnum,$udom,$uname,$logentry)=@_;
       $kdom=
      $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($kdom));
       $knum=
      $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($knum));
       $cdom=
      $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
       $cnum=
      $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
       $udom=$ENV{'user.name'} unless (defined($udom));
       $uname=$ENV{'user.domain'} unless (defined($uname));
       my %existing=&get('accesskeys',[$ckey],$kdom,$knum);
       if (($existing{$ckey}=~/^\#(.*)$/) || # - new key
           ($existing{$ckey}=~/^\Q$uname\E\:\Q$udom\E\#(.*)$/)) { 
                                                     # assigned to this person
                                                     # - this should not happen,
                                                     # unless something went wrong
                                                     # the first time around
   # ready to assign
           $logentry=$1.'; '.$logentry;
           if (&put('accesskeys',{$ckey=>$uname.':'.$udom.'#'.$logentry},
                                                    $kdom,$knum) eq 'ok') {
   # key now belongs to user
       my $envkey='key.'.$cdom.'_'.$cnum;
               if (&put('environment',{$envkey => $ckey}) eq 'ok') {
                   &appenv('environment.'.$envkey => $ckey);
                   return 'ok';
               } else {
                   return 
     'error: Count not permanently assign key, will need to be re-entered later.';
       }
           } else {
               return 'error: Could not assign key, try again later.';
           }
       } elsif (!$existing{$ckey}) {
   # the key does not exist
    return 'error: The key does not exist';
       } else {
   # the key is somebody else's
    return 'error: The key is already in use';
       }
   }
   
   # ------------------------------------------ put an additional comment on a key
   
   sub comment_access_key {
   #
   # a valid key looks like uname:udom#comments
   # comments are being appended
   #
       my ($ckey,$cdom,$cnum,$logentry)=@_;
       $cdom=
      $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
       $cnum=
      $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
       my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
       if ($existing{$ckey}) {
           $existing{$ckey}.='; '.$logentry;
   # ready to assign
           if (&put('accesskeys',{$ckey=>$existing{$ckey}},
                                                    $cdom,$cnum) eq 'ok') {
       return 'ok';
           } else {
       return 'error: Count not store comment.';
           }
       } else {
   # the key does not exist
    return 'error: The key does not exist';
       }
   }
   
   # ------------------------------------------------------ Generate a set of keys
   
   sub generate_access_keys {
       my ($number,$cdom,$cnum,$logentry)=@_;
       $cdom=
      $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
       $cnum=
      $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
       unless (&allowed('mky',$cdom)) { return 0; }
       unless (($cdom) && ($cnum)) { return 0; }
       if ($number>10000) { return 0; }
       sleep(2); # make sure don't get same seed twice
       srand(time()^($$+($$<<15))); # from "Programming Perl"
       my $total=0;
       for (my $i=1;$i<=$number;$i++) {
          my $newkey=sprintf("%lx",int(100000*rand)).'-'.
                     sprintf("%lx",int(100000*rand)).'-'.
                     sprintf("%lx",int(100000*rand));
          $newkey=~s/1/g/g; # folks mix up 1 and l
          $newkey=~s/0/h/g; # and also 0 and O
          my %existing=&get('accesskeys',[$newkey],$cdom,$cnum);
          if ($existing{$newkey}) {
              $i--;
          } else {
     if (&put('accesskeys',
                 { $newkey => '# generated '.localtime().
                              ' by '.$ENV{'user.name'}.'@'.$ENV{'user.domain'}.
                              '; '.$logentry },
      $cdom,$cnum) eq 'ok') {
                 $total++;
     }
          }
       }
       &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
            'Generated '.$total.' keys for '.$cnum.' at '.$cdom);
       return $total;
   }
   
   # ------------------------------------------------------- Validate an accesskey
   
   sub validate_access_key {
       my ($ckey,$cdom,$cnum,$udom,$uname)=@_;
       $cdom=
      $ENV{'course.'.$ENV{'request.course.id'}.'.domain'} unless (defined($cdom));
       $cnum=
      $ENV{'course.'.$ENV{'request.course.id'}.'.num'} unless (defined($cnum));
       $udom=$ENV{'user.domain'} unless (defined($udom));
       $uname=$ENV{'user.name'} unless (defined($uname));
       my %existing=&get('accesskeys',[$ckey],$cdom,$cnum);
       return ($existing{$ckey}=~/^\Q$uname\E\:\Q$udom\E\#/);
   }
   
 # ------------------------------------- Find the section of student in a course  # ------------------------------------- Find the section of student in a course
   
 sub usection {  sub getsection {
     my ($udom,$unam,$courseid)=@_;      my ($udom,$unam,$courseid)=@_;
     $courseid=~s/\_/\//g;      $courseid=~s/\_/\//g;
     $courseid=~s/^(\w)/\/$1/;      $courseid=~s/^(\w)/\/$1/;
   
       my $hashid="$udom:$unam:$courseid";
       my ($result,$cached)=&is_cached(\%getsectioncache,$hashid,'getsection');
       if (defined($cached)) { return $result; }
   
       my %Pending; 
       my %Expired;
       #
       # Each role can either have not started yet (pending), be active, 
       #    or have expired.
       #
       # If there is an active role, we are done.
       #
       # If there is more than one role which has not started yet, 
       #     choose the one which will start sooner
       # If there is one role which has not started yet, return it.
       #
       # If there is more than one expired role, choose the one which ended last.
       # If there is a role which has expired, return it.
       #
     foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',      foreach (split(/\&/,&reply('dump:'.$udom.':'.$unam.':roles',
                         &homeserver($unam,$udom)))) {                          &homeserver($unam,$udom)))) {
         my ($key,$value)=split(/\=/,$_);          my ($key,$value)=split(/\=/,$_);
         $key=&unescape($key);          $key=&unescape($key);
         if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {          next if ($key !~/^\Q$courseid\E(?:\/)*(\w+)*\_st$/);
             my $section=$1;          my $section=$1;
             if ($key eq $courseid.'_st') { $section=''; }          if ($key eq $courseid.'_st') { $section=''; }
     my ($dummy,$end,$start)=split(/\_/,&unescape($value));          my ($dummy,$end,$start)=split(/\_/,&unescape($value));
             my $now=time;          my $now=time;
             my $notactive=0;          if (defined($end) && $end && ($now > $end)) {
             if ($start) {              $Expired{$end}=$section;
  if ($now<$start) { $notactive=1; }              next;
             }  
             if ($end) {  
                 if ($now>$end) { $notactive=1; }  
             }   
             unless ($notactive) { return $section; }  
         }          }
           if (defined($start) && $start && ($now < $start)) {
               $Pending{$start}=$section;
               next;
           }
           return &do_cache(\%getsectioncache,$hashid,$section,'getsection');
       }
       #
       # Presumedly there will be few matching roles from the above
       # loop and the sorting time will be negligible.
       if (scalar(keys(%Pending))) {
           my ($time) = sort {$a <=> $b} keys(%Pending);
           return &do_cache(\%getsectioncache,$hashid,$Pending{$time},'getsection');
       } 
       if (scalar(keys(%Expired))) {
           my @sorted = sort {$a <=> $b} keys(%Expired);
           my $time = pop(@sorted);
           return &do_cache(\%getsectioncache,$hashid,$Expired{$time},'getsection');
       }
       return &do_cache(\%getsectioncache,$hashid,'-1','getsection');
   }
   
   
   my $disk_caching_disabled=1;
   
   sub devalidate_cache {
       my ($cache,$id,$name) = @_;
       delete $$cache{$id.'.time'};
       delete $$cache{$id.'.file'};
       delete $$cache{$id};
       if (1 || $disk_caching_disabled) { return; }
       my $filename=$perlvar{'lonDaemons'}.'/tmp/lonnet_internal_cache_'.$name.".db";
       if (!-e $filename) { return; }
       open(DB,">$filename.lock");
       flock(DB,LOCK_EX);
       my %hash;
       if (tie(%hash,'GDBM_File',$filename,&GDBM_WRCREAT(),0640)) {
    eval <<'EVALBLOCK';
       delete($hash{$id});
       delete($hash{$id.'.time'});
   EVALBLOCK
           if ($@) {
       &logthis("<font color='red'>devalidate_cache blew up :$@:$name</font>");
       unlink($filename);
    }
       } else {
    if (-e $filename) {
       &logthis("Unable to tie hash (devalidate cache): $name");
       unlink($filename);
    }
     }      }
     return '-1';      untie(%hash);
       flock(DB,LOCK_UN);
       close(DB);
   }
   
   sub is_cached {
       my ($cache,$id,$name,$time) = @_;
       if (!$time) { $time=300; }
       if (!exists($$cache{$id.'.time'})) {
    &load_cache_item($cache,$name,$id,$time);
       }
       if (!exists($$cache{$id.'.time'})) {
   # &logthis("Didn't find $id");
    return (undef,undef);
       } else {
    if (time-($$cache{$id.'.time'})>$time) {
       if (exists($$cache{$id.'.file'})) {
    foreach my $filename (@{ $$cache{$id.'.file'} }) {
       my $mtime=(stat($filename))[9];
       #+1 is to take care of edge effects
       if ($mtime && (($mtime+1) < ($$cache{$id.'.time'}))) {
   # &logthis("Upping $mtime - ".$$cache{$id.'.time'}.
   # "$id because of $filename");
       } else {
    &logthis("Devalidating $filename $id - ".(time-($$cache{$id.'.time'})));
    &devalidate_cache($cache,$id,$name);
    return (undef,undef);
       }
    }
    $$cache{$id.'.time'}=time;
       } else {
   # &logthis("Devalidating $id - ".time-($$cache{$id.'.time'}));
    &devalidate_cache($cache,$id,$name);
    return (undef,undef);
       }
    }
       }
       return ($$cache{$id},1);
   }
   
   sub do_cache {
       my ($cache,$id,$value,$name) = @_;
       $$cache{$id.'.time'}=time;
       $$cache{$id}=$value;
   #    &logthis("Caching $id as :$value:");
       &save_cache_item($cache,$name,$id);
       # do_cache implictly return the set value
       $$cache{$id};
   }
   
   my %do_save_item;
   my %do_save;
   sub save_cache_item {
       my ($cache,$name,$id)=@_;
       if ($disk_caching_disabled) { return; }
       $do_save{$name}=$cache;
       if (!exists($do_save_item{$name})) { $do_save_item{$name}={} }
       $do_save_item{$name}->{$id}=1;
       return;
   }
   
   sub save_cache {
       if ($disk_caching_disabled) { return; }
       my ($cache,$name,$id);
       foreach $name (keys(%do_save)) {
    $cache=$do_save{$name};
   
    my $starttime=&Time::HiRes::time();
    &logthis("Saving :$name:");
    my %hash;
    my $filename=$perlvar{'lonDaemons'}.'/tmp/lonnet_internal_cache_'.$name.".db";
    open(DB,">$filename.lock");
    flock(DB,LOCK_EX);
    if (tie(%hash,'GDBM_File',$filename,&GDBM_WRCREAT(),0640)) {
       foreach $id (keys(%{ $do_save_item{$name} })) {
    eval <<'EVALBLOCK';
    $hash{$id.'.time'}=$$cache{$id.'.time'};
    $hash{$id}=freeze({'item'=>$$cache{$id}});
    if (exists($$cache{$id.'.file'})) {
       $hash{$id.'.file'}=freeze({'item'=>$$cache{$id.'.file'}});
    }
   EVALBLOCK
                   if ($@) {
       &logthis("<font color='red'>save_cache blew up :$@:$name</font>");
       unlink($filename);
       last;
    }
       }
    } else {
       if (-e $filename) {
    &logthis("Unable to tie hash (save cache): $name ($!)");
    unlink($filename);
       }
    }
    untie(%hash);
    flock(DB,LOCK_UN);
    close(DB);
    &logthis("save_cache $name took ".(&Time::HiRes::time()-$starttime));
       }
       undef(%do_save);
       undef(%do_save_item);
   
   }
   
   sub load_cache_item {
       my ($cache,$name,$id,$time)=@_;
       if ($disk_caching_disabled) { return; }
       my $starttime=&Time::HiRes::time();
   #    &logthis("Before Loading $name  for $id size is ".scalar(%$cache));
       my %hash;
       my $filename=$perlvar{'lonDaemons'}.'/tmp/lonnet_internal_cache_'.$name.".db";
       if (!-e $filename) { return; }
       open(DB,">$filename.lock");
       flock(DB,LOCK_SH);
       if (tie(%hash,'GDBM_File',$filename,&GDBM_READER(),0640)) {
    eval <<'EVALBLOCK';
       if (!%$cache) {
    my $count;
    while (my ($key,$value)=each(%hash)) { 
       $count++;
       if ($key =~ /\.time$/) {
    $$cache{$key}=$value;
       } else {
    my $hashref=thaw($value);
    $$cache{$key}=$hashref->{'item'};
       }
    }
   #    &logthis("Initial load: $count");
       } else {
    if (($$cache{$id.'.time'}+$time) < time) {
       $$cache{$id.'.time'}=$hash{$id.'.time'};
       {
    my $hashref=thaw($hash{$id});
    $$cache{$id}=$hashref->{'item'};
       }
       if (exists($hash{$id.'.file'})) {
    my $hashref=thaw($hash{$id.'.file'});
    $$cache{$id.'.file'}=$hashref->{'item'};
       }
    }
       }
   EVALBLOCK
           if ($@) {
       &logthis("<font color='red'>load_cache blew up :$@:$name</font>");
       unlink($filename);
    }        
       } else {
    if (-e $filename) {
       &logthis("Unable to tie hash (load cache item): $name ($!)");
       unlink($filename);
    }
       }
       untie(%hash);
       flock(DB,LOCK_UN);
       close(DB);
   #    &logthis("After Loading $name size is ".scalar(%$cache));
   #    &logthis("load_cache_item $name took ".(&Time::HiRes::time()-$starttime));
 }  }
   
 # ------------------------------------- Read an entry from a user's environment  # ------------------------------------- Read an entry from a user's environment
Line 552  sub userenvironment { Line 1054  sub userenvironment {
     return %returnhash;      return %returnhash;
 }  }
   
   # -------------------------------------------------------------------- New chat
   
   sub chatsend {
       my ($newentry,$anon)=@_;
       my $cnum=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
       my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
       my $chome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
       &reply('chatsend:'.$cdom.':'.$cnum.':'.
      &escape($ENV{'user.domain'}.':'.$ENV{'user.name'}.':'.$anon.':'.
      &escape($newentry)),$chome);
   }
   
   # ------------------------------------------ Find current version of a resource
   
   sub getversion {
       my $fname=&clutter(shift);
       unless ($fname=~/^\/res\//) { return -1; }
       return &currentversion(&filelocation('',$fname));
   }
   
   sub currentversion {
       my $fname=shift;
       my ($result,$cached)=&is_cached(\%resversioncache,$fname,'resversion',600);
       if (defined($cached)) { return $result; }
       my $author=$fname;
       $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
       my ($udom,$uname)=split(/\//,$author);
       my $home=homeserver($uname,$udom);
       if ($home eq 'no_host') { 
           return -1; 
       }
       my $answer=reply("currentversion:$fname",$home);
       if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
    return -1;
       }
       return &do_cache(\%resversioncache,$fname,$answer,'resversion');
   }
   
 # ----------------------------- Subscribe to a resource, return URL if possible  # ----------------------------- Subscribe to a resource, return URL if possible
   
 sub subscribe {  sub subscribe {
     my $fname=shift;      my $fname=shift;
       if ($fname=~/\/(aboutme|syllabus|bulletinboard|smppg)$/) { return ''; }
       $fname=~s/[\n\r]//g;
     my $author=$fname;      my $author=$fname;
     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;      $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
     my ($udom,$uname)=split(/\//,$author);      my ($udom,$uname)=split(/\//,$author);
     my $home=homeserver($uname,$udom);      my $home=homeserver($uname,$udom);
     if (($home eq 'no_host') || ($home eq $perlvar{'lonHostID'})) {       if ($home eq 'no_host') {
         return 'not_found';           return 'not_found';
     }      }
     my $answer=reply("sub:$fname",$home);      my $answer=reply("sub:$fname",$home);
     if (($answer eq 'con_lost') || ($answer eq 'rejected')) {      if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
Line 575  sub subscribe { Line 1117  sub subscribe {
 sub repcopy {  sub repcopy {
     my $filename=shift;      my $filename=shift;
     $filename=~s/\/+/\//g;      $filename=~s/\/+/\//g;
       if ($filename=~m|^/home/httpd/html/adm/|) { return OK; }
       if ($filename=~m|^/home/httpd/html/lonUsers/|) { return OK; }
       if ($filename=~m|^/home/httpd/html/userfiles/| or
    $filename=~m|^/*uploaded/|) { 
    return &repcopy_userfile($filename);
       }
       $filename=~s/[\n\r]//g;
     my $transname="$filename.in.transfer";      my $transname="$filename.in.transfer";
     if ((-e $filename) || (-e $transname)) { return OK; }      if ((-e $filename) || (-e $transname)) { return OK; }
     my $remoteurl=subscribe($filename);      my $remoteurl=subscribe($filename);
Line 582  sub repcopy { Line 1131  sub repcopy {
    &logthis("Subscribe returned $remoteurl: $filename");     &logthis("Subscribe returned $remoteurl: $filename");
            return HTTP_SERVICE_UNAVAILABLE;             return HTTP_SERVICE_UNAVAILABLE;
     } elsif ($remoteurl eq 'not_found') {      } elsif ($remoteurl eq 'not_found') {
    &logthis("Subscribe returned not_found: $filename");     #&logthis("Subscribe returned not_found: $filename");
    return HTTP_NOT_FOUND;     return HTTP_NOT_FOUND;
     } elsif ($remoteurl =~ /^rejected by/) {      } elsif ($remoteurl =~ /^rejected by/) {
    &logthis("Subscribe returned $remoteurl: $filename");     &logthis("Subscribe returned $remoteurl: $filename");
Line 590  sub repcopy { Line 1139  sub repcopy {
     } elsif ($remoteurl eq 'directory') {      } elsif ($remoteurl eq 'directory') {
            return OK;             return OK;
     } else {      } else {
           my $author=$filename;
           $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
           my ($udom,$uname)=split(/\//,$author);
           my $home=homeserver($uname,$udom);
           unless ($home eq $perlvar{'lonHostID'}) {
            my @parts=split(/\//,$filename);             my @parts=split(/\//,$filename);
            my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";             my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
            if ($path ne "$perlvar{'lonDocRoot'}/res") {             if ($path ne "$perlvar{'lonDocRoot'}/res") {
Line 625  sub repcopy { Line 1179  sub repcopy {
                rename($transname,$filename);                 rename($transname,$filename);
                return OK;                 return OK;
            }             }
          }
     }      }
 }  }
   
   # ------------------------------------------------ Get server side include body
   sub ssi_body {
       my ($filelink,%form)=@_;
       my $output=($filelink=~/^http\:/?&externalssi($filelink):
                                        &ssi($filelink,%form));
       $output=~s|//(\s*<!--)? BEGIN LON-CAPA Internal.+// END LON-CAPA Internal\s*(-->)?\s||gs;
       $output=~s/^.*?\<body[^\>]*\>//si;
       $output=~s/(.*)\<\/body\s*\>.*?$/$1/si;
       return $output;
   }
   
 # --------------------------------------------------------- Server Side Include  # --------------------------------------------------------- Server Side Include
   
 sub ssi {  sub ssi {
Line 640  sub ssi { Line 1206  sub ssi {
           
     if (%form) {      if (%form) {
       $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);        $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
       $request->content(join '&', map { "$_=$form{$_}" } keys %form);        $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
     } else {      } else {
       $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);        $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
     }      }
Line 651  sub ssi { Line 1217  sub ssi {
     return $response->content;      return $response->content;
 }  }
   
   sub externalssi {
       my ($url)=@_;
       my $ua=new LWP::UserAgent;
       my $request=new HTTP::Request('GET',$url);
       my $response=$ua->request($request);
       return $response->content;
   }
   
   # -------------------------------- Allow a /uploaded/ URI to be vouched for
   
   sub allowuploaded {
       my ($srcurl,$url)=@_;
       $url=&clutter(&declutter($url));
       my $dir=$url;
       $dir=~s/\/[^\/]+$//;
       my %httpref=();
       my $httpurl=&hreflocation('',$url);
       $httpref{'httpref.'.$httpurl}=$srcurl;
       &Apache::lonnet::appenv(%httpref);
   }
   
   # --------- File operations in /home/httpd/html/userfiles/$domain/1/2/3/$course
   # input: action, courseID, current domain, home server for course, intended
   #        path to file, source of file.
   # output: url to file (if action was uploaddoc), 
   #         ok if successful, or diagnostic message otherwise (if action was propagate or copy)
   #
   # Allows directory structure to be used within lonUsers/../userfiles/ for a 
   # course.
   #
   # action = propagate - /home/httpd/html/userfiles/$domain/1/2/3/$course/$file
   #          will be copied to /home/httpd/lonUsers/1/2/3/$course/userfiles in
   #          course's home server.
   #
   # action = copy - /home/httpd/html/userfiles/$domain/1/2/3/$course/$file will
   #          be copied from $source (current location) to 
   #          /home/httpd/html/userfiles/$domain/1/2/3/$course/$file
   #         and will then be copied to
   #          /home/httpd/lonUsers/$domain/1/2/3/$course/userfiles/$file in
   #         course's home server.
   #
   # action = uploaddoc - /home/httpd/html/userfiles/$domain/1/2/3/$course/$file
   #         will be retrived from $ENV{form.uploaddoc} (from DOCS interface) to
   #         /home/httpd/html/userfiles/$domain/1/2/3/$course/$file
   #         and will then be copied to /home/httpd/lonUsers/1/2/3/$course/userfiles/$file
   #         in course's home server.
   
   
   sub process_coursefile {
       my ($action,$docuname,$docudom,$docuhome,$file,$source)=@_;
       my $fetchresult;
       if ($action eq 'propagate') {
           $fetchresult= &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$file
                               ,$docuhome);
       } else {
           my $fetchresult = '';
           my $fpath = '';
           my $fname = $file;
           ($fpath,$fname) = ($file =~ m|^(.*)/([^/]+)$|);
           $fpath=$docudom.'/'.$docuname.'/'.$fpath;
           my $filepath=$perlvar{'lonDocRoot'}.'/userfiles';
           unless ($fpath eq '') {
               my @parts=split('/',$fpath);
               foreach my $part (@parts) {
                   $filepath.= '/'.$part;
                   if ((-e $filepath)!=1) {
                       mkdir($filepath,0777);
                   }
               }
           }
           if ($action eq 'copy') {
               if ($source eq '') {
                   $fetchresult = 'no source file';
                   return $fetchresult;
               } else {
                   my $destination = $filepath.'/'.$fname;
                   rename($source,$destination);
                   $fetchresult= &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$file,
                                    $docuhome);
               }
           } elsif ($action eq 'uploaddoc') {
               open(my $fh,'>'.$filepath.'/'.$fname);
               print $fh $ENV{'form.'.$source};
               close($fh);
               $fetchresult= &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$file,
                                    $docuhome);
               if ($fetchresult eq 'ok') {
                   return '/uploaded/'.$fpath.'/'.$fname;
               } else {
                   &logthis('Failed to transfer '.$docudom.'/'.$docuname.'/'.$file.
                           ' to host '.$docuhome.': '.$fetchresult);
                   return '/adm/notfound.html';
               }
           }
       }
       unless ( $fetchresult eq 'ok') {
           &logthis('Failed to transfer '.$docudom.'/'.$docuname.'/'.$file.
                ' to host '.$docuhome.': '.$fetchresult);
       }
       return $fetchresult;
   }
   
   # --------------- Take an uploaded file and put it into the userfiles directory
   # input: name of form element, coursedoc=1 means this is for the course
   # output: url of file in userspace
   
   sub clean_filename {
       my ($fname)=@_;
   # Replace Windows backslashes by forward slashes
       $fname=~s/\\/\//g;
   # Get rid of everything but the actual filename
       $fname=~s/^.*\/([^\/]+)$/$1/;
   # Replace spaces by underscores
       $fname=~s/\s+/\_/g;
   # Replace all other weird characters by nothing
       $fname=~s/[^\w\.\-]//g;
   # Replace all .\d. sequences with _\d. so they no longer look like version
   # numbers
       $fname=~s/\.(\d+)(?=\.)/_$1/g;
       return $fname;
   }
   
   sub userfileupload {
       my ($formname,$coursedoc,$subdir)=@_;
       if (!defined($subdir)) { $subdir='unknown'; }
       my $fname=$ENV{'form.'.$formname.'.filename'};
       $fname=&clean_filename($fname);
   # See if there is anything left
       unless ($fname) { return 'error: no uploaded file'; }
       chop($ENV{'form.'.$formname});
       if (($formname eq 'screenshot') && ($subdir eq 'helprequests')) { #files uploaded to help request form are handled differently
           my $now = time;
           my $filepath = 'tmp/helprequests/'.$now;
           my @parts=split(/\//,$filepath);
           my $fullpath = $perlvar{'lonDaemons'};
           for (my $i=0;$i<@parts;$i++) {
               $fullpath .= '/'.$parts[$i];
               if ((-e $fullpath)!=1) {
                   mkdir($fullpath,0777);
               }
           }
           open(my $fh,'>'.$fullpath.'/'.$fname);
           print $fh $ENV{'form.'.$formname};
           close($fh);
           return $fullpath.'/'.$fname; 
       }
   # Create the directory if not present
       my $docuname='';
       my $docudom='';
       my $docuhome='';
       $fname="$subdir/$fname";
       if ($coursedoc) {
    $docuname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
    $docudom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
    $docuhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
           if ($ENV{'form.folder'} =~ m/^default/) {
               return &finishuserfileupload($docuname,$docudom,$docuhome,$formname,$fname);
           } else {
               $fname=$ENV{'form.folder'}.'/'.$fname;
               return &process_coursefile('uploaddoc',$docuname,$docudom,$docuhome,$fname,$formname);
           }
       } else {
           $docuname=$ENV{'user.name'};
           $docudom=$ENV{'user.domain'};
           $docuhome=$ENV{'user.home'};
           return &finishuserfileupload($docuname,$docudom,$docuhome,$formname,$fname);
       }
   }
   
   sub finishuserfileupload {
       my ($docuname,$docudom,$docuhome,$formname,$fname)=@_;
       my $path=$docudom.'/'.$docuname.'/';
       my $filepath=$perlvar{'lonDocRoot'};
       my ($fnamepath,$file);
       $file=$fname;
       if ($fname=~m|/|) {
           ($fnamepath,$file) = ($fname =~ m|^(.*)/([^/]+)$|);
    $path.=$fnamepath.'/';
       }
       my @parts=split(/\//,$filepath.'/userfiles/'.$path);
       my $count;
       for ($count=4;$count<=$#parts;$count++) {
           $filepath.="/$parts[$count]";
           if ((-e $filepath)!=1) {
       mkdir($filepath,0777);
           }
       }
   # Save the file
       {
    #&Apache::lonnet::logthis("Saving to $filepath $file");
          open(my $fh,'>'.$filepath.'/'.$file);
          print $fh $ENV{'form.'.$formname};
          close($fh);
       }
   # Notify homeserver to grep it
   #
       my $fetchresult= &reply('fetchuserfile:'.$path.$file,$docuhome);
       if ($fetchresult eq 'ok') {
   #
   # Return the URL to it
           return '/uploaded/'.$path.$file;
       } else {
           &logthis('Failed to transfer '.$path.$file.' to host '.$docuhome.
    ': '.$fetchresult);
           return '/adm/notfound.html';
       }    
   }
   
   sub removeuploadedurl {
       my ($url)=@_;
       my (undef,undef,$udom,$uname,$fname)=split('/',$url,5);
       return &Apache::lonnet::removeuserfile($uname,$udom,$fname);
   }
   
   sub removeuserfile {
       my ($docuname,$docudom,$fname)=@_;
       my $home=&homeserver($docuname,$docudom);
       return &reply("removeuserfile:$docudom/$docuname/$fname",$home);
   }
   
   sub mkdiruserfile {
       my ($docuname,$docudom,$dir)=@_;
       my $home=&homeserver($docuname,$docudom);
       return &reply("mkdiruserfile:".&escape("$docudom/$docuname/$dir"),$home);
   }
   
   sub renameuserfile {
       my ($docuname,$docudom,$old,$new)=@_;
       my $home=&homeserver($docuname,$docudom);
       return &reply("renameuserfile:$docudom:$docuname:".&escape("$old").':'.
     &escape("$new"),$home);
   }
   
 # ------------------------------------------------------------------------- Log  # ------------------------------------------------------------------------- Log
   
 sub log {  sub log {
Line 659  sub log { Line 1458  sub log {
 }  }
   
 # ------------------------------------------------------------------ Course Log  # ------------------------------------------------------------------ Course Log
   #
   # This routine flushes several buffers of non-mission-critical nature
   #
   
 sub flushcourselogs {  sub flushcourselogs {
     &logthis('Flushing course log buffers');      &logthis('Flushing log buffers');
   #
   # course logs
   # This is a log of all transactions in a course, which can be used
   # for data mining purposes
   #
   # It also collects the courseid database, which lists last transaction
   # times and course titles for all courseids
   #
       my %courseidbuffer=();
     foreach (keys %courselogs) {      foreach (keys %courselogs) {
         my $crsid=$_;          my $crsid=$_;
         if (&reply('log:'.$coursedombuf{$crsid}.':'.          if (&reply('log:'.$coursedombuf{$crsid}.':'.$coursenumbuf{$crsid}.':'.
           &escape($courselogs{$crsid}),            &escape($courselogs{$crsid}),
           $coursehombuf{$crsid}) eq 'ok') {            $coursehombuf{$crsid}) eq 'ok') {
     delete $courselogs{$crsid};      delete $courselogs{$crsid};
Line 675  sub flushcourselogs { Line 1486  sub flushcourselogs {
                         " exceeded maximum size, deleting.</font>");                          " exceeded maximum size, deleting.</font>");
                delete $courselogs{$crsid};                 delete $courselogs{$crsid};
             }              }
         }                  }
           if ($courseidbuffer{$coursehombuf{$crsid}}) {
              $courseidbuffer{$coursehombuf{$crsid}}.='&'.
    &escape($crsid).'='.&escape($coursedescrbuf{$crsid}).
                            '='.&escape($courseinstcodebuf{$crsid});
           } else {
              $courseidbuffer{$coursehombuf{$crsid}}=
    &escape($crsid).'='.&escape($coursedescrbuf{$crsid}).
                            '='.&escape($courseinstcodebuf{$crsid});
           }    
       }
   #
   # Write course id database (reverse lookup) to homeserver of courses 
   # Is used in pickcourse
   #
       foreach (keys %courseidbuffer) {
           &courseidput($hostdom{$_},$courseidbuffer{$_},$_);
       }
   #
   # File accesses
   # Writes to the dynamic metadata of resources to get hit counts, etc.
   #
       foreach my $entry (keys(%accesshash)) {
           if ($entry =~ /___count$/) {
               my ($dom,$name);
               ($dom,$name,undef)=($entry=~m:___(\w+)/(\w+)/(.*)___count$:);
               if (! defined($dom) || $dom eq '' || 
                   ! defined($name) || $name eq '') {
                   my $cid = $ENV{'request.course.id'};
                   $dom  = $ENV{'request.'.$cid.'.domain'};
                   $name = $ENV{'request.'.$cid.'.num'};
               }
               my $value = $accesshash{$entry};
               my (undef,$url,undef) = ($entry =~ /^(.*)___(.*)___count$/);
               my %temphash=($url => $value);
               my $result = &inc('nohist_accesscount',\%temphash,$dom,$name);
               if ($result eq 'ok') {
                   delete $accesshash{$entry};
               } elsif ($result eq 'unknown_cmd') {
                   # Target server has old code running on it.
                   my %temphash=($entry => $value);
                   if (&put('nohist_resevaldata',\%temphash,$dom,$name) eq 'ok') {
                       delete $accesshash{$entry};
                   }
               }
           } else {
               my ($dom,$name) = ($entry=~m:___(\w+)/(\w+)/(.*)___(\w+)$:);
               my %temphash=($entry => $accesshash{$entry});
               if (&put('nohist_resevaldata',\%temphash,$dom,$name) eq 'ok') {
                   delete $accesshash{$entry};
               }
           }
     }      }
     &logthis('Flushing access logs');  #
     foreach (keys %accesshash) {  # Roles
   # Reverse lookup of user roles for course faculty/staff and co-authorship
   #
       foreach (keys %userrolehash) {
         my $entry=$_;          my $entry=$_;
         $entry=~/\_\_\_(\w+)\/(\w+)\/(.*)\_\_\_(\w+)$/;          my ($role,$uname,$udom,$runame,$rudom,$rsec)=
         my %temphash=($entry => $accesshash{$entry});      split(/\:/,$entry);
         if (&Apache::lonnet::put('resevaldata',\%temphash,$1,$2) eq 'ok') {          if (&Apache::lonnet::put('nohist_userroles',
     delete $accesshash{$entry};               { $role.':'.$uname.':'.$udom.':'.$rsec => $userrolehash{$entry} },
                   $rudom,$runame) eq 'ok') {
       delete $userrolehash{$entry};
         }          }
     }      }
     $dumpcount++;      $dumpcount++;
Line 694  sub courselog { Line 1561  sub courselog {
     $what=time.':'.$what;      $what=time.':'.$what;
     unless ($ENV{'request.course.id'}) { return ''; }      unless ($ENV{'request.course.id'}) { return ''; }
     $coursedombuf{$ENV{'request.course.id'}}=      $coursedombuf{$ENV{'request.course.id'}}=
        $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.         $ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
       $coursenumbuf{$ENV{'request.course.id'}}=
        $ENV{'course.'.$ENV{'request.course.id'}.'.num'};         $ENV{'course.'.$ENV{'request.course.id'}.'.num'};
     $coursehombuf{$ENV{'request.course.id'}}=      $coursehombuf{$ENV{'request.course.id'}}=
        $ENV{'course.'.$ENV{'request.course.id'}.'.home'};         $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
       $coursedescrbuf{$ENV{'request.course.id'}}=
          $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
       $courseinstcodebuf{$ENV{'request.course.id'}}=
          $ENV{'course.'.$ENV{'request.course.id'}.'.internal.coursecode'};
     if (defined $courselogs{$ENV{'request.course.id'}}) {      if (defined $courselogs{$ENV{'request.course.id'}}) {
  $courselogs{$ENV{'request.course.id'}}.='&'.$what;   $courselogs{$ENV{'request.course.id'}}.='&'.$what;
     } else {      } else {
Line 712  sub courseacclog { Line 1584  sub courseacclog {
     my $fnsymb=shift;      my $fnsymb=shift;
     unless ($ENV{'request.course.id'}) { return ''; }      unless ($ENV{'request.course.id'}) { return ''; }
     my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};      my $what=$fnsymb.':'.$ENV{'user.name'}.':'.$ENV{'user.domain'};
     if ($fnsymb=~/(problem|exam|quiz|assess|survey|form)$/) {      if ($fnsymb=~/(problem|exam|quiz|assess|survey|form|page)$/) {
         $what.=':POST';          $what.=':POST';
  foreach (keys %ENV) {   foreach (keys %ENV) {
             if ($_=~/^form\.(.*)/) {              if ($_=~/^form\.(.*)/) {
Line 725  sub courseacclog { Line 1597  sub courseacclog {
   
 sub countacc {  sub countacc {
     my $url=&declutter(shift);      my $url=&declutter(shift);
       return if (! defined($url) || $url eq '');
     unless ($ENV{'request.course.id'}) { return ''; }      unless ($ENV{'request.course.id'}) { return ''; }
     $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;      $accesshash{$ENV{'request.course.id'}.'___'.$url.'___course'}=1;
     my $key=$processmarker.'_'.$dumpcount.'___'.$url.'___count';      my $key=$$.$processmarker.'_'.$dumpcount.'___'.$url.'___count';
     if (defined($accesshash{$key})) {      $accesshash{$key}++;
  $accesshash{$key}++;  }
   
   sub linklog {
       my ($from,$to)=@_;
       $from=&declutter($from);
       $to=&declutter($to);
       $accesshash{$from.'___'.$to.'___comefrom'}=1;
       $accesshash{$to.'___'.$from.'___goto'}=1;
   }
     
   sub userrolelog {
       my ($trole,$username,$domain,$area,$tstart,$tend)=@_;
       if (($trole=~/^ca/) || ($trole=~/^in/) || 
           ($trole=~/^cc/) || ($trole=~/^ep/) ||
           ($trole=~/^cr/) || ($trole=~/^ta/)) {
          my (undef,$rudom,$runame,$rsec)=split(/\//,$area);
          $userrolehash
            {$trole.':'.$username.':'.$domain.':'.$runame.':'.$rudom.':'.$rsec}
                       =$tend.':'.$tstart;
      }
   }
   
   sub get_course_adv_roles {
       my $cid=shift;
       $cid=$ENV{'request.course.id'} unless (defined($cid));
       my %coursehash=&coursedescription($cid);
       my %nothide=();
       foreach (split(/\s*\,\s*/,$coursehash{'nothideprivileged'})) {
    $nothide{join(':',split(/[\@\:]/,$_))}=1;
       }
       my %returnhash=();
       my %dumphash=
               &dump('nohist_userroles',$coursehash{'domain'},$coursehash{'num'});
       my $now=time;
       foreach (keys %dumphash) {
    my ($tend,$tstart)=split(/\:/,$dumphash{$_});
           if (($tstart) && ($tstart<0)) { next; }
           if (($tend) && ($tend<$now)) { next; }
           if (($tstart) && ($now<$tstart)) { next; }
           my ($role,$username,$domain,$section)=split(/\:/,$_);
    if ((&privileged($username,$domain)) && 
       (!$nothide{$username.':'.$domain})) { next; }
           my $key=&plaintext($role);
           if ($section) { $key.=' (Sec/Grp '.$section.')'; }
           if ($returnhash{$key}) {
       $returnhash{$key}.=','.$username.':'.$domain;
           } else {
               $returnhash{$key}=$username.':'.$domain;
           }
        }
       return %returnhash;
   }
   
   sub get_my_roles {
       my ($uname,$udom)=@_;
       unless (defined($uname)) { $uname=$ENV{'user.name'}; }
       unless (defined($udom)) { $udom=$ENV{'user.domain'}; }
       my %dumphash=
               &dump('nohist_userroles',$udom,$uname);
       my %returnhash=();
       my $now=time;
       foreach (keys %dumphash) {
    my ($tend,$tstart)=split(/\:/,$dumphash{$_});
           if (($tstart) && ($tstart<0)) { next; }
           if (($tend) && ($tend<$now)) { next; }
           if (($tstart) && ($now<$tstart)) { next; }
           my ($role,$username,$domain,$section)=split(/\:/,$_);
    $returnhash{$username.':'.$domain.':'.$role}=$tstart.':'.$tend;
        }
       return %returnhash;
   }
   
   # ----------------------------------------------------- Frontpage Announcements
   #
   #
   
   sub postannounce {
       my ($server,$text)=@_;
       unless (&allowed('psa',$hostdom{$server})) { return 'refused'; }
       unless ($text=~/\w/) { $text=''; }
       return &reply('setannounce:'.&escape($text),$server);
   }
   
   sub getannounce {
   
       if (open(my $fh,$perlvar{'lonDocRoot'}.'/announcement.txt')) {
    my $announcement='';
    while (<$fh>) { $announcement .=$_; }
    close($fh);
    if ($announcement=~/\w/) { 
       return 
      '<table bgcolor="#FF5555" cellpadding="5" cellspacing="3">'.
      '<tr><td bgcolor="#FFFFFF"><tt>'.$announcement.'</tt></td></tr></table>'; 
    } else {
       return '';
    }
     } else {      } else {
         $accesshash{$key}=1;   return '';
     }      }
 }  }
       
   # ---------------------------------------------------------- Course ID routines
   # Deal with domain's nohist_courseid.db files
   #
   
   sub courseidput {
       my ($domain,$what,$coursehome)=@_;
       return &reply('courseidput:'.$domain.':'.$what,$coursehome);
   }
   
   sub courseiddump {
       my ($domfilter,$descfilter,$sincefilter,$hostidflag,$hostidref)=@_;
       my %returnhash=();
       unless ($domfilter) { $domfilter=''; }
       foreach my $tryserver (keys %libserv) {
           if ( ($hostidflag == 1 && grep/^$tryserver$/,@{$hostidref}) || (!defined($hostidflag)) ) {
       if ((!$domfilter) || ($hostdom{$tryserver} eq $domfilter)) {
           foreach (
                    split(/\&/,&reply('courseiddump:'.$hostdom{$tryserver}.':'.
          $sincefilter.':'.&escape($descfilter),
                                  $tryserver))) {
       my ($key,$value)=split(/\=/,$_);
                       if (($key) && ($value)) {
           $returnhash{&unescape($key)}=$value;
                       }
                   }
               }
           }
       }
       return %returnhash;
   }
   
   #
 # ----------------------------------------------------------- Check out an item  # ----------------------------------------------------------- Check out an item
   
   sub get_first_access {
       my ($type,$argsymb)=@_;
       my ($symb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
       if ($argsymb) { $symb=$argsymb; }
       my ($map,$id,$res)=&decode_symb($symb);
       if ($type eq 'map') { $res=$map; }
       my %times=&get('firstaccesstimes',[$res],$udom,$uname);
       return $times{$res};
   }
   
   sub set_first_access {
       my ($type)=@_;
       my ($symb,$courseid,$udom,$uname)=&Apache::lonxml::whichuser();
       my ($map,$id,$res)=&decode_symb($symb);
       if ($type eq 'map') { $res=$map; }
       my $firstaccess=&get_first_access($type);
       if (!$firstaccess) {
    return &put('firstaccesstimes',{$res=>time},$udom,$uname);
       }
       return 'already_set';
   }
   
 sub checkout {  sub checkout {
     my ($symb,$tuname,$tudom,$tcrsid)=@_;      my ($symb,$tuname,$tudom,$tcrsid)=@_;
     my $now=time;      my $now=time;
     my $lonhost=$perlvar{'lonHostID'};      my $lonhost=$perlvar{'lonHostID'};
     my $infostr=&escape(      my $infostr=&escape(
                    'CHECKOUTTOKEN&'.
                  $tuname.'&'.                   $tuname.'&'.
                  $tudom.'&'.                   $tudom.'&'.
                  $tcrsid.'&'.                   $tcrsid.'&'.
Line 791  sub checkin { Line 1814  sub checkin {
     $lonhost=~tr/A-Z/a-z/;      $lonhost=~tr/A-Z/a-z/;
     my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;      my $dtoken=$ta.'_'.$hostip{$lonhost}.'_'.$tb;
     $dtoken=~s/\W/\_/g;      $dtoken=~s/\W/\_/g;
     my ($tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=      my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
                  split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));                   split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
   
     unless (($tuname) && ($tudom)) {      unless (($tuname) && ($tudom)) {
Line 841  sub expirespread { Line 1864  sub expirespread {
 # ----------------------------------------------------- Devalidate Spreadsheets  # ----------------------------------------------------- Devalidate Spreadsheets
   
 sub devalidate {  sub devalidate {
     my $symb=shift;      my ($symb,$uname,$udom)=@_;
     my $cid=$ENV{'request.course.id'};       my $cid=$ENV{'request.course.id'}; 
     if ($cid) {      if ($cid) {
  my $key=$ENV{'user.name'}.':'.$ENV{'user.domain'}.':';          # delete the stored spreadsheets for
           # - the student level sheet of this user in course's homespace
           # - the assessment level sheet for this resource 
           #   for this user in user's homespace
    # - current conditional state info
    my $key=$uname.':'.$udom.':';
         my $status=          my $status=
     &del('nohist_calculatedsheet',      &del('nohist_calculatedsheets',
  [$key.'studentcalc'],   [$key.'studentcalc:'],
  $ENV{'course.'.$cid.'.domain'},   $ENV{'course.'.$cid.'.domain'},
  $ENV{'course.'.$cid.'.num'})   $ENV{'course.'.$cid.'.num'})
  .' '.   .' '.
     &del('nohist_calculatedsheets_'.$cid,      &del('nohist_calculatedsheets_'.$cid,
  [$key.'assesscalc:'.$symb]);   [$key.'assesscalc:'.$symb],$udom,$uname);
         unless ($status eq 'ok ok') {          unless ($status eq 'ok ok') {
            &logthis('Could not devalidate spreadsheet '.             &logthis('Could not devalidate spreadsheet '.
                     $ENV{'user.name'}.' at '.$ENV{'user.domain'}.' for '.                      $uname.' at '.$udom.' for '.
     $symb.': '.$status);      $symb.': '.$status);
         }          }
    &delenv('user.state.'.$cid);
       }
   }
   
   sub get_scalar {
       my ($string,$end) = @_;
       my $value;
       if ($$string =~ s/^([^&]*?)($end)/$2/) {
    $value = $1;
       } elsif ($$string =~ s/^([^&]*?)&//) {
    $value = $1;
     }      }
       return &unescape($value);
   }
   
   sub array2str {
     my (@array) = @_;
     my $result=&arrayref2str(\@array);
     $result=~s/^__ARRAY_REF__//;
     $result=~s/__END_ARRAY_REF__$//;
     return $result;
   }
   
   sub arrayref2str {
     my ($arrayref) = @_;
     my $result='__ARRAY_REF__';
     foreach my $elem (@$arrayref) {
       if(ref($elem) eq 'ARRAY') {
         $result.=&arrayref2str($elem).'&';
       } elsif(ref($elem) eq 'HASH') {
         $result.=&hashref2str($elem).'&';
       } elsif(ref($elem)) {
         #print("Got a ref of ".(ref($elem))." skipping.");
       } else {
         $result.=&escape($elem).'&';
       }
     }
     $result=~s/\&$//;
     $result .= '__END_ARRAY_REF__';
     return $result;
 }  }
   
 sub hash2str {  sub hash2str {
   my (%hash)=@_;    my (%hash) = @_;
   my $result='';    my $result=&hashref2str(\%hash);
   foreach (keys %hash) { $result.=escape($_).'='.escape($hash{$_}).'&'; }    $result=~s/^__HASH_REF__//;
     $result=~s/__END_HASH_REF__$//;
     return $result;
   }
   
   sub hashref2str {
     my ($hashref)=@_;
     my $result='__HASH_REF__';
     foreach (sort(keys(%$hashref))) {
       if (ref($_) eq 'ARRAY') {
         $result.=&arrayref2str($_).'=';
       } elsif (ref($_) eq 'HASH') {
         $result.=&hashref2str($_).'=';
       } elsif (ref($_)) {
         $result.='=';
         #print("Got a ref of ".(ref($_))." skipping.");
       } else {
    if ($_) {$result.=&escape($_).'=';} else { last; }
       }
   
       if(ref($hashref->{$_}) eq 'ARRAY') {
         $result.=&arrayref2str($hashref->{$_}).'&';
       } elsif(ref($hashref->{$_}) eq 'HASH') {
         $result.=&hashref2str($hashref->{$_}).'&';
       } elsif(ref($hashref->{$_})) {
          $result.='&';
         #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
       } else {
         $result.=&escape($hashref->{$_}).'&';
       }
     }
   $result=~s/\&$//;    $result=~s/\&$//;
     $result .= '__END_HASH_REF__';
   return $result;    return $result;
 }  }
   
 sub str2hash {  sub str2hash {
       my ($string)=@_;
       my ($hash)=&str2hashref('__HASH_REF__'.$string.'__END_HASH_REF__');
       return %$hash;
   }
   
   sub str2hashref {
   my ($string) = @_;    my ($string) = @_;
   my %returnhash;  
   foreach (split(/\&/,$string)) {    my %hash;
     my ($name,$value)=split(/\=/,$_);  
     $returnhash{&unescape($name)}=&unescape($value);    if($string !~ /^__HASH_REF__/) {
         if (! ($string eq '' || !defined($string))) {
     $hash{'error'}='Not hash reference';
         }
         return (\%hash, $string);
   }    }
   return %returnhash;  
     $string =~ s/^__HASH_REF__//;
   
     while($string !~ /^__END_HASH_REF__/) {
         #key
         my $key='';
         if($string =~ /^__HASH_REF__/) {
             ($key, $string)=&str2hashref($string);
             if(defined($key->{'error'})) {
                 $hash{'error'}='Bad data';
                 return (\%hash, $string);
             }
         } elsif($string =~ /^__ARRAY_REF__/) {
             ($key, $string)=&str2arrayref($string);
             if($key->[0] eq 'Array reference error') {
                 $hash{'error'}='Bad data';
                 return (\%hash, $string);
             }
         } else {
             $string =~ s/^(.*?)=//;
     $key=&unescape($1);
         }
         $string =~ s/^=//;
   
         #value
         my $value='';
         if($string =~ /^__HASH_REF__/) {
             ($value, $string)=&str2hashref($string);
             if(defined($value->{'error'})) {
                 $hash{'error'}='Bad data';
                 return (\%hash, $string);
             }
         } elsif($string =~ /^__ARRAY_REF__/) {
             ($value, $string)=&str2arrayref($string);
             if($value->[0] eq 'Array reference error') {
                 $hash{'error'}='Bad data';
                 return (\%hash, $string);
             }
         } else {
     $value=&get_scalar(\$string,'__END_HASH_REF__');
         }
         $string =~ s/^&//;
   
         $hash{$key}=$value;
     }
   
     $string =~ s/^__END_HASH_REF__//;
   
     return (\%hash, $string);
   }
   
   sub str2array {
       my ($string)=@_;
       my ($array)=&str2arrayref('__ARRAY_REF__'.$string.'__END_ARRAY_REF__');
       return @$array;
   }
   
   sub str2arrayref {
     my ($string) = @_;
     my @array;
   
     if($string !~ /^__ARRAY_REF__/) {
         if (! ($string eq '' || !defined($string))) {
     $array[0]='Array reference error';
         }
         return (\@array, $string);
     }
   
     $string =~ s/^__ARRAY_REF__//;
   
     while($string !~ /^__END_ARRAY_REF__/) {
         my $value='';
         if($string =~ /^__HASH_REF__/) {
             ($value, $string)=&str2hashref($string);
             if(defined($value->{'error'})) {
                 $array[0] ='Array reference error';
                 return (\@array, $string);
             }
         } elsif($string =~ /^__ARRAY_REF__/) {
             ($value, $string)=&str2arrayref($string);
             if($value->[0] eq 'Array reference error') {
                 $array[0] ='Array reference error';
                 return (\@array, $string);
             }
         } else {
     $value=&get_scalar(\$string,'__END_ARRAY_REF__');
         }
         $string =~ s/^&//;
   
         push(@array, $value);
     }
   
     $string =~ s/^__END_ARRAY_REF__//;
   
     return (\@array, $string);
 }  }
   
 # -------------------------------------------------------------------Temp Store  # -------------------------------------------------------------------Temp Store
Line 885  sub tmpreset { Line 2087  sub tmpreset {
   my ($symb,$namespace,$domain,$stuname) = @_;    my ($symb,$namespace,$domain,$stuname) = @_;
   if (!$symb) {    if (!$symb) {
     $symb=&symbread();      $symb=&symbread();
     if (!$symb) { $symb= $ENV{'REQUEST_URI'}; }      if (!$symb) { $symb= $ENV{'request.url'}; }
   }    }
   $symb=escape($symb);    $symb=escape($symb);
   
Line 900  sub tmpreset { Line 2102  sub tmpreset {
   my %hash;    my %hash;
   if (tie(%hash,'GDBM_File',    if (tie(%hash,'GDBM_File',
   $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',    $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
   &GDBM_WRCREAT,0640)) {    &GDBM_WRCREAT(),0640)) {
     foreach my $key (keys %hash) {      foreach my $key (keys %hash) {
       if ($key=~ /:$symb/) {        if ($key=~ /:$symb/) {
  delete($hash{$key});   delete($hash{$key});
Line 936  sub tmpstore { Line 2138  sub tmpstore {
   my $path=$perlvar{'lonDaemons'}.'/tmp';    my $path=$perlvar{'lonDaemons'}.'/tmp';
   if (tie(%hash,'GDBM_File',    if (tie(%hash,'GDBM_File',
   $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',    $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
   &GDBM_WRCREAT,0640)) {    &GDBM_WRCREAT(),0640)) {
     $hash{"version:$symb"}++;      $hash{"version:$symb"}++;
     my $version=$hash{"version:$symb"};      my $version=$hash{"version:$symb"};
     my $allkeys='';       my $allkeys=''; 
Line 980  sub tmprestore { Line 2182  sub tmprestore {
   my $path=$perlvar{'lonDaemons'}.'/tmp';    my $path=$perlvar{'lonDaemons'}.'/tmp';
   if (tie(%hash,'GDBM_File',    if (tie(%hash,'GDBM_File',
   $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',    $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
   &GDBM_READER,0640)) {    &GDBM_READER(),0640)) {
     my $version=$hash{"version:$symb"};      my $version=$hash{"version:$symb"};
     $returnhash{'version'}=$version;      $returnhash{'version'}=$version;
     my $scope;      my $scope;
Line 1011  sub store { Line 2213  sub store {
   
     if ($stuname) { $home=&homeserver($stuname,$domain); }      if ($stuname) { $home=&homeserver($stuname,$domain); }
   
       $symb=&symbclean($symb);
     if (!$symb) { unless ($symb=&symbread()) { return ''; } }      if (!$symb) { unless ($symb=&symbread()) { return ''; } }
   
     &devalidate($symb);      if (!$domain) { $domain=$ENV{'user.domain'}; }
       if (!$stuname) { $stuname=$ENV{'user.name'}; }
   
       &devalidate($symb,$stuname,$domain);
   
     $symb=escape($symb);      $symb=escape($symb);
     if (!$namespace) {       if (!$namespace) { 
Line 1021  sub store { Line 2227  sub store {
           return '';             return ''; 
        }          } 
     }      }
     if (!$domain) { $domain=$ENV{'user.domain'}; }  
     if (!$stuname) { $stuname=$ENV{'user.name'}; }  
     if (!$home) { $home=$ENV{'user.home'}; }      if (!$home) { $home=$ENV{'user.home'}; }
   
       $$storehash{'ip'}=$ENV{'REMOTE_ADDR'};
       $$storehash{'host'}=$perlvar{'lonHostID'};
   
     my $namevalue='';      my $namevalue='';
     foreach (keys %$storehash) {      foreach (keys %$storehash) {
         $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';          $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
Line 1041  sub cstore { Line 2249  sub cstore {
   
     if ($stuname) { $home=&homeserver($stuname,$domain); }      if ($stuname) { $home=&homeserver($stuname,$domain); }
   
       $symb=&symbclean($symb);
     if (!$symb) { unless ($symb=&symbread()) { return ''; } }      if (!$symb) { unless ($symb=&symbread()) { return ''; } }
   
     &devalidate($symb);      if (!$domain) { $domain=$ENV{'user.domain'}; }
       if (!$stuname) { $stuname=$ENV{'user.name'}; }
   
       &devalidate($symb,$stuname,$domain);
   
     $symb=escape($symb);      $symb=escape($symb);
     if (!$namespace) {       if (!$namespace) { 
Line 1051  sub cstore { Line 2263  sub cstore {
           return '';             return ''; 
        }          } 
     }      }
     if (!$domain) { $domain=$ENV{'user.domain'}; }  
     if (!$stuname) { $stuname=$ENV{'user.name'}; }  
     if (!$home) { $home=$ENV{'user.home'}; }      if (!$home) { $home=$ENV{'user.home'}; }
   
       $$storehash{'ip'}=$ENV{'REMOTE_ADDR'};
       $$storehash{'host'}=$perlvar{'lonHostID'};
   
     my $namevalue='';      my $namevalue='';
     foreach (keys %$storehash) {      foreach (keys %$storehash) {
         $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';          $namevalue.=escape($_).'='.escape($$storehash{$_}).'&';
Line 1076  sub restore { Line 2289  sub restore {
     if (!$symb) {      if (!$symb) {
       unless ($symb=escape(&symbread())) { return ''; }        unless ($symb=escape(&symbread())) { return ''; }
     } else {      } else {
       $symb=&escape($symb);        $symb=&escape(&symbclean($symb));
     }      }
     if (!$namespace) {       if (!$namespace) { 
        unless ($namespace=$ENV{'request.course.id'}) {          unless ($namespace=$ENV{'request.course.id'}) { 
Line 1110  sub coursedescription { Line 2323  sub coursedescription {
     $courseid=~s/\_/\//g;      $courseid=~s/\_/\//g;
     my ($cdomain,$cnum)=split(/\//,$courseid);      my ($cdomain,$cnum)=split(/\//,$courseid);
     my $chome=&homeserver($cnum,$cdomain);      my $chome=&homeserver($cnum,$cdomain);
       my $normalid=$cdomain.'_'.$cnum;
       # need to always cache even if we get errors otherwise we keep 
       # trying and trying and trying to get the course description.
       my %envhash=();
       my %returnhash=();
       $envhash{'course.'.$normalid.'.last_cache'}=time;
     if ($chome ne 'no_host') {      if ($chome ne 'no_host') {
        my %returnhash=&dump('environment',$cdomain,$cnum);         %returnhash=&dump('environment',$cdomain,$cnum);
        if (!exists($returnhash{'con_lost'})) {         if (!exists($returnhash{'con_lost'})) {
            my $normalid=$cdomain.'_'.$cnum;  
            my %envhash=();  
            $returnhash{'home'}= $chome;             $returnhash{'home'}= $chome;
    $returnhash{'domain'} = $cdomain;     $returnhash{'domain'} = $cdomain;
    $returnhash{'num'} = $cnum;     $returnhash{'num'} = $cnum;
            while (my ($name,$value) = each %returnhash) {             while (my ($name,$value) = each %returnhash) {
                $envhash{'course.'.$normalid.'.'.$name}=$value;                 $envhash{'course.'.$normalid.'.'.$name}=$value;
            }             }
            $returnhash{'url'}='/res/'.declutter($returnhash{'url'});             $returnhash{'url'}=&clutter($returnhash{'url'});
            $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.             $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
        $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;         $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
            $envhash{'course.'.$normalid.'.last_cache'}=time;  
            $envhash{'course.'.$normalid.'.home'}=$chome;             $envhash{'course.'.$normalid.'.home'}=$chome;
            $envhash{'course.'.$normalid.'.domain'}=$cdomain;             $envhash{'course.'.$normalid.'.domain'}=$cdomain;
            $envhash{'course.'.$normalid.'.num'}=$cnum;             $envhash{'course.'.$normalid.'.num'}=$cnum;
            &appenv(%envhash);  
            return %returnhash;  
        }         }
     }      }
     return ();      &appenv(%envhash);
       return %returnhash;
   }
   
   # -------------------------------------------------See if a user is privileged
   
   sub privileged {
       my ($username,$domain)=@_;
       my $rolesdump=&reply("dump:$domain:$username:roles",
    &homeserver($username,$domain));
       if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return 0; }
       my $now=time;
       if ($rolesdump ne '') {
           foreach (split(/&/,$rolesdump)) {
       if ($_!~/^rolesdef\&/) {
    my ($area,$role)=split(/=/,$_);
    $area=~s/\_\w\w$//;
    my ($trole,$tend,$tstart)=split(/_/,$role);
    if (($trole eq 'dc') || ($trole eq 'su')) {
       my $active=1;
       if ($tend) {
    if ($tend<$now) { $active=0; }
       }
       if ($tstart) {
    if ($tstart>$now) { $active=0; }
       }
       if ($active) { return 1; }
    }
       }
    }
       }
       return 0;
 }  }
   
 # -------------------------------------------------------- Get user privileges  # -------------------------------------------------------- Get user privileges
Line 1142  sub rolesinit { Line 2387  sub rolesinit {
     my $rolesdump=reply("dump:$domain:$username:roles",$authhost);      my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
     if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }      if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
     my %allroles=();      my %allroles=();
     my %thesepriv=();  
     my $now=time;      my $now=time;
     my $userroles="user.login.time=$now\n";      my $userroles="user.login.time=$now\n";
     my $thesestr;  
   
     if ($rolesdump ne '') {      if ($rolesdump ne '') {
         foreach (split(/&/,$rolesdump)) {          foreach (split(/&/,$rolesdump)) {
Line 1153  sub rolesinit { Line 2396  sub rolesinit {
             my ($area,$role)=split(/=/,$_);              my ($area,$role)=split(/=/,$_);
             $area=~s/\_\w\w$//;              $area=~s/\_\w\w$//;
             my ($trole,$tend,$tstart)=split(/_/,$role);              my ($trole,$tend,$tstart)=split(/_/,$role);
             $userroles.='user.role.'.$trole.'.'.$area.'='.              $userroles.=&set_arearole($trole,$area,$tstart,$tend);
                         $tstart.'.'.$tend."\n";              if (($tend!=0) && ($tend<$now)) { $trole=''; }
             if ($tend!=0) {              if (($tstart!=0) && ($tstart>$now)) { $trole=''; }
         if ($tend<$now) {  
             $trole='';  
                 }   
             }  
             if ($tstart!=0) {  
                 if ($tstart>$now) {  
                    $trole='';          
                 }  
             }  
             if (($area ne '') && ($trole ne '')) {              if (($area ne '') && ($trole ne '')) {
        my $spec=$trole.'.'.$area;   my $spec=$trole.'.'.$area;
                my ($tdummy,$tdomain,$trest)=split(/\//,$area);   my ($tdummy,$tdomain,$trest)=split(/\//,$area);
                if ($trole =~ /^cr\//) {   if ($trole =~ /^cr\//) {
    my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);                      &custom_roleprivs(\%allroles,$trole,$tdomain,$trest,$spec,$area);
                    my $homsvr=homeserver($rauthor,$rdomain);   } else {
                    if ($hostname{$homsvr} ne '') {                      &standard_roleprivs(\%allroles,$trole,$tdomain,$spec,$trest,$area);
                       my $roledef=   }
   reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",  
                                 $homsvr);  
                       if (($roledef ne 'con_lost') && ($roledef ne '')) {  
                          my ($syspriv,$dompriv,$coursepriv)=  
      split(/\_/,unescape($roledef));  
                   $allroles{'cm./'}.=':'.$syspriv;  
                          $allroles{$spec.'./'}.=':'.$syspriv;  
                          if ($tdomain ne '') {  
                              $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;  
                              $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;  
                              if ($trest ne '') {  
                 $allroles{'cm.'.$area}.=':'.$coursepriv;  
                 $allroles{$spec.'.'.$area}.=':'.$coursepriv;  
                              }  
                  }  
                       }  
                    }  
                } else {  
            $allroles{'cm./'}.=':'.$pr{$trole.':s'};  
            $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};  
                    if ($tdomain ne '') {  
                      $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};  
                      $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};  
                       if ($trest ne '') {  
           $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};  
           $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};  
                       }  
            }  
        }  
             }              }
           }             } 
         }          }
         my $adv=0;          my ($author,$adv) = &set_userprivs(\$userroles,\%allroles);
         my $author=0;  
         foreach (keys %allroles) {  
             %thesepriv=();  
             if (($_!~/^st/) && ($_!~/^ta/) && ($_!~/^cm/)) { $adv=1; }  
             if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }  
             foreach (split(/:/,$allroles{$_})) {  
                 if ($_ ne '') {  
     my ($privilege,$restrictions)=split(/&/,$_);  
                     if ($restrictions eq '') {  
  $thesepriv{$privilege}='F';  
                     } else {  
                         if ($thesepriv{$privilege} ne 'F') {  
     $thesepriv{$privilege}.=$restrictions;  
                         }  
                     }  
                 }  
             }  
             $thesestr='';  
             foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }  
             $userroles.='user.priv.'.$_.'='.$thesestr."\n";  
         }  
         $userroles.='user.adv='.$adv."\n".          $userroles.='user.adv='.$adv."\n".
             'user.author='.$author."\n";              'user.author='.$author."\n";
         $ENV{'user.adv'}=$adv;          $ENV{'user.adv'}=$adv;
Line 1234  sub rolesinit { Line 2418  sub rolesinit {
     return $userroles;        return $userroles;  
 }  }
   
   sub set_arearole {
       my ($trole,$area,$tstart,$tend,$domain,$username) = @_;
   # log the associated role with the area
       &userrolelog($trole,$username,$domain,$area,$tstart,$tend);
       return 'user.role.'.$trole.'.'.$area.'='.$tstart.'.'.$tend."\n";
   }
   
   sub custom_roleprivs {
       my ($allroles,$trole,$tdomain,$trest,$spec,$area) = @_;
       my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
       my $homsvr=homeserver($rauthor,$rdomain);
       if ($hostname{$homsvr} ne '') {
           my ($rdummy,$roledef)=
               &get('roles',["rolesdef_$rrole"],$rdomain,$rauthor);
           if (($rdummy ne 'con_lost') && ($roledef ne '')) {
               my ($syspriv,$dompriv,$coursepriv)=split(/\_/,$roledef);
               if (defined($syspriv)) {
                   $$allroles{'cm./'}.=':'.$syspriv;
                   $$allroles{$spec.'./'}.=':'.$syspriv;
               }
               if ($tdomain ne '') {
                   if (defined($dompriv)) {
                       $$allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
                       $$allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
                   }
                   if (($trest ne '') && (defined($coursepriv))) {
                       $$allroles{'cm.'.$area}.=':'.$coursepriv;
                       $$allroles{$spec.'.'.$area}.=':'.$coursepriv;
                   }
               }
           }
       }
   }
   
   
   sub standard_roleprivs {
       my ($allroles,$trole,$tdomain,$spec,$trest,$area) = @_;
       if (defined($pr{$trole.':s'})) {
           $$allroles{'cm./'}.=':'.$pr{$trole.':s'};
           $$allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
       }
       if ($tdomain ne '') {
           if (defined($pr{$trole.':d'})) {
               $$allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
               $$allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
           }
           if (($trest ne '') && (defined($pr{$trole.':c'}))) {
               $$allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
               $$allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
           }
       }
   }
   
   sub set_userprivs {
       my ($userroles,$allroles) = @_; 
       my $author=0;
       my $adv=0;
       foreach (keys %{$allroles}) {
           my %thesepriv=();
           if (($_=~/^au/) || ($_=~/^ca/)) { $author=1; }
           foreach (split(/:/,$$allroles{$_})) {
               if ($_ ne '') {
                   my ($privilege,$restrictions)=split(/&/,$_);
                   if ($restrictions eq '') {
                       $thesepriv{$privilege}='F';
                   } elsif ($thesepriv{$privilege} ne 'F') {
                       $thesepriv{$privilege}.=$restrictions;
                   }
                   if ($thesepriv{'adv'} eq 'F') { $adv=1; }
               }
           }
           my $thesestr='';
           foreach (keys %thesepriv) { $thesestr.=':'.$_.'&'.$thesepriv{$_}; }
           $$userroles.='user.priv.'.$_.'='.$thesestr."\n";
       }
       return ($author,$adv);
   }
   
 # --------------------------------------------------------------- get interface  # --------------------------------------------------------------- get interface
   
 sub get {  sub get {
Line 1249  sub get { Line 2511  sub get {
   
    my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);     my $rep=&reply("get:$udomain:$uname:$namespace:$items",$uhome);
    my @pairs=split(/\&/,$rep);     my @pairs=split(/\&/,$rep);
      if ( $#pairs==0 && $pairs[0] =~ /^(con_lost|error|no_such_host)/i) {
        return @pairs;
      }
    my %returnhash=();     my %returnhash=();
    my $i=0;     my $i=0;
    foreach (@$storearr) {     foreach (@$storearr) {
       $returnhash{$_}=unescape($pairs[$i]);        $returnhash{$_}=&thaw_unescape($pairs[$i]);
       $i++;        $i++;
    }     }
    return %returnhash;     return %returnhash;
Line 1291  sub dump { Line 2556  sub dump {
    my %returnhash=();     my %returnhash=();
    foreach (@pairs) {     foreach (@pairs) {
       my ($key,$value)=split(/=/,$_);        my ($key,$value)=split(/=/,$_);
       $returnhash{unescape($key)}=unescape($value);        $returnhash{unescape($key)}=&thaw_unescape($value);
      }
      return %returnhash;
   }
   
   # -------------------------------------------------------------- keys interface
   
   sub getkeys {
      my ($namespace,$udomain,$uname)=@_;
      if (!$udomain) { $udomain=$ENV{'user.domain'}; }
      if (!$uname) { $uname=$ENV{'user.name'}; }
      my $uhome=&homeserver($uname,$udomain);
      my $rep=reply("keys:$udomain:$uname:$namespace",$uhome);
      my @keyarray=();
      foreach (split(/\&/,$rep)) {
         push (@keyarray,&unescape($_));
      }
      return @keyarray;
   }
   
   # --------------------------------------------------------------- currentdump
   sub currentdump {
      my ($courseid,$sdom,$sname)=@_;
      $courseid = $ENV{'request.course.id'} if (! defined($courseid));
      $sdom     = $ENV{'user.domain'}       if (! defined($sdom));
      $sname    = $ENV{'user.name'}         if (! defined($sname));
      my $uhome = &homeserver($sname,$sdom);
      my $rep=reply('currentdump:'.$sdom.':'.$sname.':'.$courseid,$uhome);
      return if ($rep =~ /^(error:|no_such_host)/);
      #
      my %returnhash=();
      #
      if ($rep eq "unknown_cmd") { 
          # an old lond will not know currentdump
          # Do a dump and make it look like a currentdump
          my @tmp = &dump($courseid,$sdom,$sname,'.');
          return if ($tmp[0] =~ /^(error:|no_such_host)/);
          my %hash = @tmp;
          @tmp=();
          %returnhash = %{&convert_dump_to_currentdump(\%hash)};
      } else {
          my @pairs=split(/\&/,$rep);
          foreach (@pairs) {
              my ($key,$value)=split(/=/,$_);
              my ($symb,$param) = split(/:/,$key);
              $returnhash{&unescape($symb)}->{&unescape($param)} = 
                                                           &thaw_unescape($value);
          }
    }     }
    return %returnhash;     return %returnhash;
 }  }
   
   sub convert_dump_to_currentdump{
       my %hash = %{shift()};
       my %returnhash;
       # Code ripped from lond, essentially.  The only difference
       # here is the unescaping done by lonnet::dump().  Conceivably
       # we might run in to problems with parameter names =~ /^v\./
       while (my ($key,$value) = each(%hash)) {
           my ($v,$symb,$param) = split(/:/,$key);
           next if ($v eq 'version' || $symb eq 'keys');
           next if (exists($returnhash{$symb}) &&
                    exists($returnhash{$symb}->{$param}) &&
                    $returnhash{$symb}->{'v.'.$param} > $v);
           $returnhash{$symb}->{$param}=$value;
           $returnhash{$symb}->{'v.'.$param}=$v;
       }
       #
       # Remove all of the keys in the hashes which keep track of
       # the version of the parameter.
       while (my ($symb,$param_hash) = each(%returnhash)) {
           # use a foreach because we are going to delete from the hash.
           foreach my $key (keys(%$param_hash)) {
               delete($param_hash->{$key}) if ($key =~ /^v\./);
           }
       }
       return \%returnhash;
   }
   
   # --------------------------------------------------------------- inc interface
   
   sub inc {
       my ($namespace,$store,$udomain,$uname) = @_;
       if (!$udomain) { $udomain=$ENV{'user.domain'}; }
       if (!$uname) { $uname=$ENV{'user.name'}; }
       my $uhome=&homeserver($uname,$udomain);
       my $items='';
       if (! ref($store)) {
           # got a single value, so use that instead
           $items = &escape($store).'=&';
       } elsif (ref($store) eq 'SCALAR') {
           $items = &escape($$store).'=&';        
       } elsif (ref($store) eq 'ARRAY') {
           $items = join('=&',map {&escape($_);} @{$store});
       } elsif (ref($store) eq 'HASH') {
           while (my($key,$value) = each(%{$store})) {
               $items.= &escape($key).'='.&escape($value).'&';
           }
       }
       $items=~s/\&$//;
       return &reply("inc:$udomain:$uname:$namespace:$items",$uhome);
   }
   
 # --------------------------------------------------------------- put interface  # --------------------------------------------------------------- put interface
   
 sub put {  sub put {
Line 1305  sub put { Line 2668  sub put {
    my $uhome=&homeserver($uname,$udomain);     my $uhome=&homeserver($uname,$udomain);
    my $items='';     my $items='';
    foreach (keys %$storehash) {     foreach (keys %$storehash) {
        $items.=&escape($_).'='.&escape($$storehash{$_}).'&';         $items.=&escape($_).'='.&freeze_escape($$storehash{$_}).'&';
      }
      $items=~s/\&$//;
      return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
   }
   
   # ---------------------------------------------------------- putstore interface
                                                                                        
   sub putstore {
      my ($namespace,$storehash,$udomain,$uname)=@_;
      if (!$udomain) { $udomain=$ENV{'user.domain'}; }
      if (!$uname) { $uname=$ENV{'user.name'}; }
      my $uhome=&homeserver($uname,$udomain);
      my $items='';
      my %allitems = ();
      foreach (keys %$storehash) {
          if ($_ =~ m/^([^\:]+):([^\:]+):([^\:]+)$/) {
              my $key = $1.':keys:'.$2;
              $allitems{$key} .= $3.':';
          }
          $items.=$_.'='.&escape($$storehash{$_}).'&';
      }
      foreach (keys %allitems) {
          $allitems{$_} =~ s/\:$//;
          $items.= $_.'='.$allitems{$_}.'&';
    }     }
    $items=~s/\&$//;     $items=~s/\&$//;
    return &reply("put:$udomain:$uname:$namespace:$items",$uhome);     return &reply("put:$udomain:$uname:$namespace:$items",$uhome);
Line 1320  sub cput { Line 2707  sub cput {
    my $uhome=&homeserver($uname,$udomain);     my $uhome=&homeserver($uname,$udomain);
    my $items='';     my $items='';
    foreach (keys %$storehash) {     foreach (keys %$storehash) {
        $items.=escape($_).'='.escape($$storehash{$_}).'&';         $items.=escape($_).'='.&freeze_escape($$storehash{$_}).'&';
    }     }
    $items=~s/\&$//;     $items=~s/\&$//;
    return &critical("put:$udomain:$uname:$namespace:$items",$uhome);     return &critical("put:$udomain:$uname:$namespace:$items",$uhome);
Line 1343  sub eget { Line 2730  sub eget {
    my %returnhash=();     my %returnhash=();
    my $i=0;     my $i=0;
    foreach (@$storearr) {     foreach (@$storearr) {
       $returnhash{$_}=unescape($pairs[$i]);        $returnhash{$_}=&thaw_unescape($pairs[$i]);
       $i++;        $i++;
    }     }
    return %returnhash;     return %returnhash;
 }  }
   
   # ---------------------------------------------- Custom access rule evaluation
   
   sub customaccess {
       my ($priv,$uri)=@_;
       my ($urole,$urealm)=split(/\./,$ENV{'request.role'});
       $urealm=~s/^\W//;
       my ($udom,$ucrs,$usec)=split(/\//,$urealm);
       my $access=0;
       foreach (split(/\s*\,\s*/,&metadata($uri,'rule_rights'))) {
    my ($effect,$realm,$role)=split(/\:/,$_);
           if ($role) {
      if ($role ne $urole) { next; }
           }
           foreach (split(/\s*\,\s*/,$realm)) {
               my ($tdom,$tcrs,$tsec)=split(/\_/,$_);
               if ($tdom) {
    if ($tdom ne $udom) { next; }
               }
               if ($tcrs) {
    if ($tcrs ne $ucrs) { next; }
               }
               if ($tsec) {
    if ($tsec ne $usec) { next; }
               }
               $access=($effect eq 'allow');
               last;
           }
    if ($realm eq '' && $role eq '') {
               $access=($effect eq 'allow');
    }
       }
       return $access;
   }
   
 # ------------------------------------------------- Check for a user privilege  # ------------------------------------------------- Check for a user privilege
   
 sub allowed {  sub allowed {
     my ($priv,$uri)=@_;      my ($priv,$uri)=@_;
       $uri=&deversion($uri);
     my $orguri=$uri;      my $orguri=$uri;
     $uri=&declutter($uri);      $uri=&declutter($uri);
       
       
       
       if (defined($ENV{'allowed.'.$priv})) { return $ENV{'allowed.'.$priv}; }
 # Free bre access to adm and meta resources  # Free bre access to adm and meta resources
       if (((($uri=~/^adm\//) && ($uri !~ m|/bulletinboard$|)) 
     if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {   || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
  return 'F';   return 'F';
     }      }
   
   # Free bre access to user's own portfolio contents
       my ($space,$domain,$name,$dir)=split('/',$uri);
       if (('uploaded' eq $space) && ($ENV{'user.name'} eq $name) && 
    ($ENV{'user.domain'} eq $domain) && ('portfolio' eq $dir)) {
           return 'F';
       }
   
 # Free bre to public access  # Free bre to public access
   
     if ($priv eq 'bre') {      if ($priv eq 'bre') {
  if (&metadata($uri,'copyright') eq 'public') { return 'F'; }          my $copyright=&metadata($uri,'copyright');
    if (($copyright eq 'public') && (!$ENV{'request.course.id'})) { 
              return 'F'; 
           }
           if ($copyright eq 'priv') {
               $uri=~/([^\/]+)\/([^\/]+)\//;
       unless (($ENV{'user.name'} eq $2) && ($ENV{'user.domain'} eq $1)) {
    return '';
               }
           }
           if ($copyright eq 'domain') {
               $uri=~/([^\/]+)\/([^\/]+)\//;
       unless (($ENV{'user.domain'} eq $1) ||
                    ($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $1)) {
    return '';
               }
           }
           if ($ENV{'request.role'}=~ /li\.\//) {
               # Library role, so allow browsing of resources in this domain.
               return 'F';
           }
           if ($copyright eq 'custom') {
       unless (&customaccess($priv,$uri)) { return ''; }
           }
       }
       # Domain coordinator is trying to create a course
       if (($priv eq 'ccc') && ($ENV{'request.role'} =~ /^dc\./)) {
           # uri is the requested domain in this case.
           # comparison to 'request.role.domain' shows if the user has selected
           # a role of dc for the domain in question. 
           return 'F' if ($uri eq $ENV{'request.role.domain'});
     }      }
   
     my $thisallowed='';      my $thisallowed='';
Line 1375  sub allowed { Line 2836  sub allowed {
   
 # Course  # Course
   
     if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {      if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/\Q$priv\E\&([^\:]*)/) {
        $thisallowed.=$1;         $thisallowed.=$1;
     }      }
   
 # Domain  # Domain
   
     if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}      if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
        =~/$priv\&([^\:]*)/) {         =~/\Q$priv\E\&([^\:]*)/) {
        $thisallowed.=$1;         $thisallowed.=$1;
     }      }
   
Line 1392  sub allowed { Line 2853  sub allowed {
     $courseuri=~s/^([^\/])/\/$1/;      $courseuri=~s/^([^\/])/\/$1/;
   
     if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}      if ($ENV{'user.priv.'.$ENV{'request.role'}.'.'.$courseuri}
        =~/$priv\&([^\:]*)/) {         =~/\Q$priv\E\&([^\:]*)/) {
        $thisallowed.=$1;         $thisallowed.=$1;
     }      }
   
   # URI is an uploaded document for this course
   
       if (($priv eq 'bre') && ($uri=~m|^uploaded/|)) {
    my $refuri=$ENV{'httpref.'.$orguri};
    if ($refuri) {
       if ($refuri =~ m|^/adm/|) {
    $thisallowed='F';
       }
    }
       }
   
 # Full access at system, domain or course-wide level? Exit.  # Full access at system, domain or course-wide level? Exit.
   
     if ($thisallowed=~/F/) {      if ($thisallowed=~/F/) {
Line 1404  sub allowed { Line 2876  sub allowed {
   
 # If this is generating or modifying users, exit with special codes  # If this is generating or modifying users, exit with special codes
   
     if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:$priv\:/) {      if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:cca:'=~/\:\Q$priv\E\:/) {
  return $thisallowed;   return $thisallowed;
     }      }
 #  #
Line 1414  sub allowed { Line 2886  sub allowed {
 # the course  # the course
   
     if ($ENV{'request.course.id'}) {      if ($ENV{'request.course.id'}) {
   
        $courseprivid=$ENV{'request.course.id'};         $courseprivid=$ENV{'request.course.id'};
        if ($ENV{'request.course.sec'}) {         if ($ENV{'request.course.sec'}) {
           $courseprivid.='/'.$ENV{'request.course.sec'};            $courseprivid.='/'.$ENV{'request.course.sec'};
        }         }
        $courseprivid=~s/\_/\//;         $courseprivid=~s/\_/\//;
        my $checkreferer=1;         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}             if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
                =~/$priv\&([^\:]*)/) {                 =~/\Q$priv\E\&([^\:]*)/) {
                $thisallowed.=$1;                 $thisallowed.=$1;
                $checkreferer=0;                 $checkreferer=0;
            }             }
Line 1436  sub allowed { Line 2905  sub allowed {
                 
        if ($checkreferer) {         if ($checkreferer) {
   my $refuri=$ENV{'httpref.'.$orguri};    my $refuri=$ENV{'httpref.'.$orguri};
   
             unless ($refuri) {              unless ($refuri) {
                 foreach (keys %ENV) {                  foreach (keys %ENV) {
     if ($_=~/^httpref\..*\*/) {      if ($_=~/^httpref\..*\*/) {
Line 1450  sub allowed { Line 2918  sub allowed {
                     }                      }
                 }                  }
             }              }
   
          if ($refuri) {            if ($refuri) { 
   $refuri=&declutter($refuri);    $refuri=&declutter($refuri);
           my @uriparts=split(/\//,$refuri);            my ($match,$cond)=&is_on_map($refuri);
           my $filename=$uriparts[$#uriparts];              if ($match) {
           my $pathname=$refuri;                my $refstatecond=$cond;
           $pathname=~s/\/$filename$//;  
             if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~  
               /\&$filename\:([\d\|]+)\&/) {  
               my $refstatecond=$1;  
               if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}                if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
                   =~/$priv\&([^\:]*)/) {                    =~/\Q$priv\E\&([^\:]*)/) {
                   $thisallowed.=$1;                    $thisallowed.=$1;
                   $uri=$refuri;                    $uri=$refuri;
                   $statecond=$refstatecond;                    $statecond=$refstatecond;
Line 1513  sub allowed { Line 2978  sub allowed {
                if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {                 if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
    &coursedescription($courseid);     &coursedescription($courseid);
                }                 }
                if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)                 if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,\Q$csec\E\,/)
                 || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {                  || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
    if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {     if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
                        &log($ENV{'user.domain'},$ENV{'user.name'},                         &log($ENV{'user.domain'},$ENV{'user.name'},
                             $ENV{'user.host'},                              $ENV{'user.home'},
                             'Locked by res: '.$priv.' for '.$uri.' due to '.                              'Locked by res: '.$priv.' for '.$uri.' due to '.
                             $cdom.'/'.$cnum.'/'.$csec.' expire '.                              $cdom.'/'.$cnum.'/'.$csec.' expire '.
                             $ENV{$prefix.'priv.'.$priv.'.lock.expire'});                              $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
        return '';         return '';
                    }                     }
                }                 }
                if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)                 if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,\Q$csec\E\,/)
                 || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {                  || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
    if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {     if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
                        &log($ENV{'user.domain'},$ENV{'user.name'},                         &log($ENV{'user.domain'},$ENV{'user.name'},
                             $ENV{'user.host'},                              $ENV{'user.home'},
                             'Locked by priv: '.$priv.' for '.$uri.' due to '.                              'Locked by priv: '.$priv.' for '.$uri.' due to '.
                             $cdom.'/'.$cnum.'/'.$csec.' expire '.                              $cdom.'/'.$cnum.'/'.$csec.' expire '.
                             $ENV{$prefix.'priv.'.$priv.'.lock.expire'});                              $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
Line 1556  sub allowed { Line 3021  sub allowed {
   
    if ($thisallowed=~/C/) {     if ($thisallowed=~/C/) {
        my $rolecode=(split(/\./,$ENV{'request.role'}))[0];         my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
          my $unamedom=$ENV{'user.name'}.':'.$ENV{'user.domain'};
        if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}         if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
    =~/$rolecode/) {     =~/\Q$rolecode\E/) {
            &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},             &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
                 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.                  'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
                 $ENV{'request.course.id'});                  $ENV{'request.course.id'});
            return '';             return '';
        }         }
   
          if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.users.denied'}
      =~/\Q$unamedom\E/) {
              &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  # Resource preferences
   
    if ($thisallowed=~/R/) {     if ($thisallowed=~/R/) {
        my $rolecode=(split(/\./,$ENV{'request.role'}))[0];         my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
        my $filename=$perlvar{'lonDocRoot'}.'/res/'.$uri.'.meta';         if (&metadata($uri,'roledeny')=~/\Q$rolecode\E/) {
        if (-e $filename) {    &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
            my @content;  
            {  
      my $fh=Apache::File->new($filename);  
              @content=<$fh>;  
    }  
            if (join('',@content)=~  
                     /\<roledeny[^\>]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {  
        &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},  
                     'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);                      'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
            return '';            return '';
   
            }  
        }         }
    }     }
   
 # Restricted by state?  # Restricted by state or randomout?
   
    if ($thisallowed=~/X/) {     if ($thisallowed=~/X/) {
         if ($ENV{'acc.randomout'}) {
            my $symb=&symbread($uri,1);
            if (($symb) && ($ENV{'acc.randomout'}=~/\&\Q$symb\E\&/)) { 
               return ''; 
            }
         }
       if (&condval($statecond)) {        if (&condval($statecond)) {
  return '2';   return '2';
       } else {        } else {
Line 1599  sub allowed { Line 3069  sub allowed {
    return 'F';     return 'F';
 }  }
   
   # --------------------------------------------------- Is a resource on the map?
   
   sub is_on_map {
       my $uri=&declutter(shift);
       $uri=~s/\.\d+\.(\w+)$/\.$1/;
       my @uriparts=split(/\//,$uri);
       my $filename=$uriparts[$#uriparts];
       my $pathname=$uri;
       $pathname=~s|/\Q$filename\E$||;
       $pathname=~s/^adm\/wrapper\///;    
       #Trying to find the conditional for the file
       my $match=($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
          /\&\Q$filename\E\:([\d\|]+)\&/);
       if ($match) {
    return (1,$1);
       } else {
    return (0,0);
       }
   }
   
   # --------------------------------------------------------- Get symb from alias
   
   sub get_symb_from_alias {
       my $symb=shift;
       my ($map,$resid,$url)=&decode_symb($symb);
   # Already is a symb
       if ($url) { return $symb; }
   # Must be an alias
       my $aliassymb='';
       my %bighash;
       if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                               &GDBM_READER(),0640)) {
           my $rid=$bighash{'mapalias_'.$symb};
    if ($rid) {
       my ($mapid,$resid)=split(/\./,$rid);
       $aliassymb=&encode_symb($bighash{'map_id_'.$mapid},
       $resid,$bighash{'src_'.$rid});
    }
           untie %bighash;
       }
       return $aliassymb;
   }
   
 # ----------------------------------------------------------------- Define Role  # ----------------------------------------------------------------- Define Role
   
 sub definerole {  sub definerole {
   if (allowed('mcr','/')) {    if (allowed('mcr','/')) {
     my ($rolename,$sysrole,$domrole,$courole)=@_;      my ($rolename,$sysrole,$domrole,$courole)=@_;
     foreach (split('/',$sysrole)) {      foreach (split(':',$sysrole)) {
  my ($crole,$cqual)=split(/\&/,$_);   my ($crole,$cqual)=split(/\&/,$_);
         if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }          if ($pr{'cr:s'}!~/\Q$crole\E/) { return "refused:s:$crole"; }
         if ($pr{'cr:s'}=~/$crole\&/) {          if ($pr{'cr:s'}=~/\Q$crole\E\&/) {
     if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {       if ($pr{'cr:s'}!~/\Q$crole\E\&\w*\Q$cqual\E/) { 
                return "refused:s:$crole&$cqual";                  return "refused:s:$crole&$cqual"; 
             }              }
         }          }
     }      }
     foreach (split('/',$domrole)) {      foreach (split(':',$domrole)) {
  my ($crole,$cqual)=split(/\&/,$_);   my ($crole,$cqual)=split(/\&/,$_);
         if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }          if ($pr{'cr:d'}!~/\Q$crole\E/) { return "refused:d:$crole"; }
         if ($pr{'cr:d'}=~/$crole\&/) {          if ($pr{'cr:d'}=~/\Q$crole\E\&/) {
     if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {       if ($pr{'cr:d'}!~/\Q$crole\W\&\w*\Q$cqual\E/) { 
                return "refused:d:$crole&$cqual";                  return "refused:d:$crole&$cqual"; 
             }              }
         }          }
     }      }
     foreach (split('/',$courole)) {      foreach (split(':',$courole)) {
  my ($crole,$cqual)=split(/\&/,$_);   my ($crole,$cqual)=split(/\&/,$_);
         if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }          if ($pr{'cr:c'}!~/\Q$crole\E/) { return "refused:c:$crole"; }
         if ($pr{'cr:c'}=~/$crole\&/) {          if ($pr{'cr:c'}=~/\Q$crole\E\&/) {
     if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {       if ($pr{'cr:c'}!~/\Q$crole\E\&\w*\Q$cqual\E/) { 
                return "refused:c:$crole&$cqual";                  return "refused:c:$crole&$cqual"; 
             }              }
         }          }
Line 1644  sub definerole { Line 3157  sub definerole {
 # ---------------- Make a metadata query against the network of library servers  # ---------------- Make a metadata query against the network of library servers
   
 sub metadata_query {  sub metadata_query {
     my ($query,$custom,$customshow)=@_;      my ($query,$custom,$customshow,$server_array)=@_;
     my %rhash;      my %rhash;
     for my $server (keys %libserv) {      my @server_list = (defined($server_array) ? @$server_array
                                                 : keys(%libserv) );
       for my $server (@server_list) {
  unless ($custom or $customshow) {   unless ($custom or $customshow) {
     my $reply=&reply("querysend:".&escape($query),$server);      my $reply=&reply("querysend:".&escape($query),$server);
     $rhash{$server}=$reply;      $rhash{$server}=$reply;
Line 1661  sub metadata_query { Line 3176  sub metadata_query {
     return \%rhash;      return \%rhash;
 }  }
   
   # ----------------------------------------- Send log queries and wait for reply
   
   sub log_query {
       my ($uname,$udom,$query,%filters)=@_;
       my $uhome=&homeserver($uname,$udom);
       if ($uhome eq 'no_host') { return 'error: no_host'; }
       my $uhost=$hostname{$uhome};
       my $command=&escape(join(':',map{$_.'='.$filters{$_}} keys %filters));
       my $queryid=&reply("querysend:".$query.':'.$udom.':'.$uname.':'.$command,
                          $uhome);
       unless ($queryid=~/^\Q$uhost\E\_/) { return 'error: '.$queryid; }
       return get_query_reply($queryid);
   }
   
   # ------- Request retrieval of institutional classlists for course(s)
   
   sub fetch_enrollment_query {
       my ($context,$affiliatesref,$replyref,$dom,$cnum) = @_;
       my $homeserver;
       my $maxtries = 1;
       if ($context eq 'automated') {
           $homeserver = $perlvar{'lonHostID'};
           $maxtries = 10; # will wait for up to 2000s for retrieval of classlist data before timeout
       } else {
           $homeserver = &homeserver($cnum,$dom);
       }
       my $host=$hostname{$homeserver};
       my $cmd = '';
       foreach (keys %{$affiliatesref}) {
           $cmd .= $_.'='.join(",",@{$$affiliatesref{$_}}).'%%';
       }
       $cmd =~ s/%%$//;
       $cmd = &escape($cmd);
       my $query = 'fetchenrollment';
       my $queryid=&reply("querysend:".$query.':'.$dom.':'.$ENV{'user.name'}.':'.$cmd,$homeserver);
       unless ($queryid=~/^\Q$host\E\_/) { 
           &logthis('fetch_enrollment_query: invalid queryid: '.$queryid.' for host: '.$host.' and homeserver: '.$homeserver.' context: '.$context.' '.$cnum); 
           return 'error: '.$queryid;
       }
       my $reply = &get_query_reply($queryid);
       my $tries = 1;
       while (($reply=~/^timeout/) && ($tries < $maxtries)) {
           $reply = &get_query_reply($queryid);
           $tries ++;
       }
       if ( ($reply =~/^timeout/) || ($reply =~/^error/) ) {
           &logthis('fetch_enrollment_query error: '.$reply.' for '.$dom.' '.$ENV{'user.name'}.' for '.$queryid.' context: '.$context.' '.$cnum.' maxtries: '.$maxtries.' tries: '.$tries);
       } else {
           my @responses = split/:/,$reply;
           if ($homeserver eq $perlvar{'lonHostID'}) {
               foreach (@responses) {
                   my ($key,$value) = split/=/,$_;
                   $$replyref{$key} = $value;
               }
           } else {
               my $pathname = $perlvar{'lonDaemons'}.'/tmp';
               foreach (@responses) {
                   my ($key,$value) = split/=/,$_;
                   $$replyref{$key} = $value;
                   if ($value > 0) {
                       foreach (@{$$affiliatesref{$key}}) {
                           my $filename = $dom.'_'.$key.'_'.$_.'_classlist.xml';
                           my $destname = $pathname.'/'.$filename;
                           my $xml_classlist = &reply("autoretrieve:".$filename,$homeserver);
                           if ($xml_classlist =~ /^error/) {
                               &logthis('fetch_enrollment_query - autoretrieve error: '.$xml_classlist.' for '.$filename.' from server: '.$homeserver.' '.$context.' '.$cnum);
                           } else {
                               if ( open(FILE,">$destname") ) {
                                   print FILE &unescape($xml_classlist);
                                   close(FILE);
                               } else {
                                   &logthis('fetch_enrollment_query - error opening classlist file '.$destname.' '.$context.' '.$cnum);
                               }
                           }
                       }
                   }
               }
           }
           return 'ok';
       }
       return 'error';
   }
   
   sub get_query_reply {
       my $queryid=shift;
       my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
       my $reply='';
       for (1..100) {
    sleep 2;
           if (-e $replyfile.'.end') {
       if (open(my $fh,$replyfile)) {
                  $reply.=<$fh>;
                  close($fh);
      } else { return 'error: reply_file_error'; }
              return &unescape($reply);
    }
       }
       return 'timeout:'.$queryid;
   }
   
   sub courselog_query {
   #
   # possible filters:
   # url: url or symb
   # username
   # domain
   # action: view, submit, grade
   # start: timestamp
   # end: timestamp
   #
       my (%filters)=@_;
       unless ($ENV{'request.course.id'}) { return 'no_course'; }
       if ($filters{'url'}) {
    $filters{'url'}=&symbclean(&declutter($filters{'url'}));
           $filters{'url'}=~s/\.(\w+)$/(\\.\\d+)*\\.$1/;
           $filters{'url'}=~s/\.(\w+)\_\_\_/(\\.\\d+)*\\.$1/;
       }
       my $cname=$ENV{'course.'.$ENV{'request.course.id'}.'.num'};
       my $cdom=$ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
       return &log_query($cname,$cdom,'courselog',%filters);
   }
   
   sub userlog_query {
       my ($uname,$udom,%filters)=@_;
       return &log_query($uname,$udom,'userlog',%filters);
   }
   
   #--------- Call auto-enrollment subs in localenroll.pm for homeserver for course 
   
   sub auto_run {
       my ($cnum,$cdom) = @_;
       my $homeserver = &homeserver($cnum,$cdom);
       my $response = &reply('autorun:'.$cdom,$homeserver);
       return $response;
   }
                                                                                      
   sub auto_get_sections {
       my ($cnum,$cdom,$inst_coursecode) = @_;
       my $homeserver = &homeserver($cnum,$cdom);
       my @secs = ();
       my $response=&unescape(&reply('autogetsections:'.$inst_coursecode.':'.$cdom,$homeserver));
       unless ($response eq 'refused') {
           @secs = split/:/,$response;
       }
       return @secs;
   }
                                                                                      
   sub auto_new_course {
       my ($cnum,$cdom,$inst_course_id,$owner) = @_;
       my $homeserver = &homeserver($cnum,$cdom);
       my $response=&unescape(&reply('autonewcourse:'.$inst_course_id.':'.$owner.':'.$cdom,$homeserver));
       return $response;
   }
                                                                                      
   sub auto_validate_courseID {
       my ($cnum,$cdom,$inst_course_id) = @_;
       my $homeserver = &homeserver($cnum,$cdom);
       my $response=&unescape(&reply('autovalidatecourse:'.$inst_course_id.':'.$cdom,$homeserver));
       return $response;
   }
                                                                                      
   sub auto_create_password {
       my ($cnum,$cdom,$authparam) = @_;
       my $homeserver = &homeserver($cnum,$cdom); 
       my $create_passwd = 0;
       my $authchk = '';
       my $response=&unescape(&reply('autocreatepassword:'.$authparam.':'.$cdom,$homeserver));
       if ($response eq 'refused') {
           $authchk = 'refused';
       } else {
           ($authparam,$create_passwd,$authchk) = split/:/,$response;
       }
       return ($authparam,$create_passwd,$authchk);
   }
   
   sub auto_instcode_format {
       my ($caller,$codedom,$instcodes,$codes,$codetitles,$cat_titles,$cat_order) = @_;
       my $courses = '';
       my $homeserver;
       if ($caller eq 'global') {
           $homeserver = $perlvar{'lonHostID'};
       } else {
           $homeserver = &homeserver($caller,$codedom);
       }
       my $host=$hostname{$homeserver};
       foreach (keys %{$instcodes}) {
           $courses .= &escape($_).'='.&escape($$instcodes{$_}).'&';
       }
       chop($courses);
       my $response=&reply('autoinstcodeformat:'.$codedom.':'.$courses,$homeserver);
       unless ($response =~ /(con_lost|error|no_such_host|refused)/) {
           my ($codes_str,$codetitles_str,$cat_titles_str,$cat_order_str) = split/:/,$response;
           %{$codes} = &str2hash($codes_str);
           @{$codetitles} = &str2array($codetitles_str);
           %{$cat_titles} = &str2hash($cat_titles_str);
           %{$cat_order} = &str2hash($cat_order_str);
           return 'ok';
       }
       return $response;
   }
   
 # ------------------------------------------------------------------ Plain Text  # ------------------------------------------------------------------ Plain Text
   
 sub plaintext {  sub plaintext {
     my $short=shift;      my $short=shift;
     return $prp{$short};      return &mt($prp{$short});
 }  }
   
 # ----------------------------------------------------------------- Assign Role  # ----------------------------------------------------------------- Assign Role
   
 sub assignrole {  sub assignrole {
     my ($udom,$uname,$url,$role,$end,$start)=@_;      my ($udom,$uname,$url,$role,$end,$start,$deleteflag)=@_;
     my $mrole;      my $mrole;
     if ($role =~ /^cr\//) {      if ($role =~ /^cr\//) {
  unless (&allowed('ccr',$url)) {          my $cwosec=$url;
           $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
    unless (&allowed('ccr',$cwosec)) {
            &logthis('Refused custom assignrole: '.             &logthis('Refused custom assignrole: '.
              $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.               $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
     $ENV{'user.name'}.' at '.$ENV{'user.domain'});      $ENV{'user.name'}.' at '.$ENV{'user.domain'});
Line 1684  sub assignrole { Line 3402  sub assignrole {
     } else {      } else {
         my $cwosec=$url;          my $cwosec=$url;
         $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;          $cwosec=~s/^\/(\w+)\/(\w+)\/.*/$1\/$2/;
         unless (&allowed('c'.$role,$cwosec)) {           unless ((&allowed('c'.$role,$cwosec)) || &allowed('c'.$role,$udom)) { 
            &logthis('Refused assignrole: '.             &logthis('Refused assignrole: '.
              $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.               $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
     $ENV{'user.name'}.' at '.$ENV{'user.domain'});      $ENV{'user.name'}.' at '.$ENV{'user.domain'});
Line 1702  sub assignrole { Line 3420  sub assignrole {
            $command.='_0_'.$start;             $command.='_0_'.$start;
         }          }
     }      }
     return &reply($command,&homeserver($uname,$udom));  # actually delete
       if ($deleteflag) {
    if ((&allowed('dro',$udom)) || (&allowed('dro',$url))) {
   # modify command to delete the role
              $command="encrypt:rolesdel:$ENV{'user.domain'}:$ENV{'user.name'}:".
                   "$udom:$uname:$url".'_'."$mrole";
      &logthis("$ENV{'user.name'} at $ENV{'user.domain'} deletes $mrole in $url for $uname at $udom"); 
   # set start and finish to negative values for userrolelog
              $start=-1;
              $end=-1;
           }
       }
   # send command
       my $answer=&reply($command,&homeserver($uname,$udom));
   # log new user role if status is ok
       if ($answer eq 'ok') {
    &userrolelog($mrole,$uname,$udom,$url,$start,$end);
       }
       return $answer;
 }  }
   
 # -------------------------------------------------- Modify user authentication  # -------------------------------------------------- Modify user authentication
Line 1713  sub modifyuserauth { Line 3449  sub modifyuserauth {
     my $uhome=&homeserver($uname,$udom);      my $uhome=&homeserver($uname,$udom);
     unless (&allowed('mau',$udom)) { return 'refused'; }      unless (&allowed('mau',$udom)) { return 'refused'; }
     &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.      &logthis('Call to modify user authentication '.$udom.', '.$uname.', '.
              $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'});                 $umode.' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
                ' in domain '.$ENV{'request.role.domain'});  
     my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.      my $reply=&reply('encrypt:changeuserauth:'.$udom.':'.$uname.':'.$umode.':'.
      &escape($upass),$uhome);       &escape($upass),$uhome);
     &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},      &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.home'},
Line 1732  sub modifyuserauth { Line 3469  sub modifyuserauth {
   
 # --------------------------------------------------------------- Modify a user  # --------------------------------------------------------------- Modify a user
   
   
 sub modifyuser {  sub modifyuser {
     my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,      my ($udom,    $uname, $uid,
         $forceid)=@_;          $umode,   $upass, $first,
           $middle,  $last,  $gene,
           $forceid, $desiredhome, $email)=@_;
     $udom=~s/\W//g;      $udom=~s/\W//g;
     $uname=~s/\W//g;      $uname=~s/\W//g;
     &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.      &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
              $umode.', '.$first.', '.$middle.', '.               $umode.', '.$first.', '.$middle.', '.
      $last.', '.$gene.'(forceid: '.$forceid.') by '.       $last.', '.$gene.'(forceid: '.$forceid.')'.
              $ENV{'user.name'}.' at '.$ENV{'user.domain'});                 (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
     my $uhome=&homeserver($uname,$udom);                                       ' desiredhome not specified'). 
                ' by '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
                ' in domain '.$ENV{'request.role.domain'});
       my $uhome=&homeserver($uname,$udom,'true');
 # ----------------------------------------------------------------- Create User  # ----------------------------------------------------------------- Create User
     if (($uhome eq 'no_host') && ($umode) && ($upass)) {      if (($uhome eq 'no_host') && 
    (($umode && $upass) || ($umode eq 'localauth'))) {
         my $unhome='';          my $unhome='';
  if ($ENV{'course.'.$ENV{'request.course.id'}.'.domain'} eq $udom) {          if (defined($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'};      $unhome=$ENV{'course.'.$ENV{'request.course.id'}.'.home'};
         } else {          } else { # load balancing routine for determining $unhome
             my $tryserver;              my $tryserver;
             my $loadm=10000000;              my $loadm=10000000;
             foreach $tryserver (keys %libserv) {              foreach $tryserver (keys %libserv) {
Line 1762  sub modifyuser { Line 3506  sub modifyuser {
     }      }
         }          }
         if (($unhome eq '') || ($unhome eq 'no_host')) {          if (($unhome eq '') || ($unhome eq 'no_host')) {
     return 'error: find home';      return 'error: unable to find a home server for '.$uname.
                      ' in domain '.$udom;
         }          }
         my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.          my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':'.$umode.':'.
                          &escape($upass),$unhome);                           &escape($upass),$unhome);
  unless ($reply eq 'ok') {   unless ($reply eq 'ok') {
             return 'error: '.$reply;              return 'error: '.$reply;
         }             }   
         $uhome=&homeserver($uname,$udom);          $uhome=&homeserver($uname,$udom,'true');
         if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {          if (($uhome eq '') || ($uhome eq 'no_host') || ($uhome ne $unhome)) {
     return 'error: verify home';      return 'error: unable verify users home machine.';
         }          }
     }      }   # End of creation of new user
 # ---------------------------------------------------------------------- Add ID  # ---------------------------------------------------------------------- Add ID
     if ($uid) {      if ($uid) {
        $uid=~tr/A-Z/a-z/;         $uid=~tr/A-Z/a-z/;
Line 1781  sub modifyuser { Line 3526  sub modifyuser {
        if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/)          if (($uidhash{$uname}) && ($uidhash{$uname}!~/error\:/) 
          && (!$forceid)) {           && (!$forceid)) {
   unless ($uid eq $uidhash{$uname}) {    unless ($uid eq $uidhash{$uname}) {
       return 'error: mismatch '.$uidhash{$uname}.' versus '.$uid;        return 'error: user id "'.$uid.'" does not match '.
                     'current user id "'.$uidhash{$uname}.'".';
           }            }
        } else {         } else {
   &idput($udom,($uname => $uid));    &idput($udom,($uname => $uid));
        }         }
     }      }
 # -------------------------------------------------------------- Add names, etc  # -------------------------------------------------------------- Add names, etc
     my %names=&get('environment',      my @tmp=&get('environment',
    ['firstname','middlename','lastname','generation'],     ['firstname','middlename','lastname','generation'],
    $udom,$uname);     $udom,$uname);
       my %names;
       if ($tmp[0] =~ m/^error:.*/) { 
           %names=(); 
       } else {
           %names = @tmp;
       }
   #
   # Make sure to not trash student environment if instructor does not bother
   # to supply name and email information
   #
     if ($first)  { $names{'firstname'}  = $first; }      if ($first)  { $names{'firstname'}  = $first; }
     if ($middle) { $names{'middlename'} = $middle; }      if (defined($middle)) { $names{'middlename'} = $middle; }
     if ($last)   { $names{'lastname'}   = $last; }      if ($last)   { $names{'lastname'}   = $last; }
     if ($gene)   { $names{'generation'} = $gene; }      if (defined($gene))   { $names{'generation'} = $gene; }
       if ($email)  { $names{'notification'} = $email;
                      $names{'critnotification'} = $email; }
   
     my $reply = &put('environment', \%names, $udom,$uname);      my $reply = &put('environment', \%names, $udom,$uname);
     if ($reply ne 'ok') { return 'error: '.$reply; }      if ($reply ne 'ok') { return 'error: '.$reply; }
     &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.      &logthis('Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
Line 1808  sub modifyuser { Line 3567  sub modifyuser {
   
 sub modifystudent {  sub modifystudent {
     my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,      my ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,
         $end,$start,$forceid)=@_;          $end,$start,$forceid,$desiredhome,$email,$type,$locktype,$cid)=@_;
     my $cid='';      if (!$cid) {
     unless ($cid=$ENV{'request.course.id'}) {   unless ($cid=$ENV{'request.course.id'}) {
  return 'not_in_class';      return 'not_in_class';
    }
     }      }
 # --------------------------------------------------------------- Make the user  # --------------------------------------------------------------- Make the user
     my $reply=&modifyuser      my $reply=&modifyuser
  ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid);   ($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$forceid,
            $desiredhome,$email);
     unless ($reply eq 'ok') { return $reply; }      unless ($reply eq 'ok') { return $reply; }
       # This will cause &modify_student_enrollment to get the uid from the
       # students environment
       $uid = undef if (!$forceid);
       $reply = &modify_student_enrollment($udom,$uname,$uid,$first,$middle,$last,
    $gene,$usec,$end,$start,$type,$locktype,$cid);
       return $reply;
   }
   
   sub modify_student_enrollment {
       my ($udom,$uname,$uid,$first,$middle,$last,$gene,$usec,$end,$start,$type,$locktype,$cid) = @_;
       my ($cdom,$cnum,$chome);
       if (!$cid) {
    unless ($cid=$ENV{'request.course.id'}) {
       return 'not_in_class';
    }
    $cdom=$ENV{'course.'.$cid.'.domain'};
    $cnum=$ENV{'course.'.$cid.'.num'};
       } else {
    ($cdom,$cnum)=split(/_/,$cid);
       }
       $chome=$ENV{'course.'.$cid.'.home'};
       if (!$chome) {
    $chome=&homeserver($cnum,$cdom);
       }
       if (!$chome) { return 'unknown_course'; }
       # Make sure the user exists
     my $uhome=&homeserver($uname,$udom);      my $uhome=&homeserver($uname,$udom);
     if (($uhome eq '') || ($uhome eq 'no_host')) {       if (($uhome eq '') || ($uhome eq 'no_host')) { 
  return 'error: no such user';   return 'error: no such user';
     }      }
 # -------------------------------------------------- Add student to course list      # Get student data if we were not given enough information
     $reply=critical('put:'.$ENV{'course.'.$cid.'.domain'}.':'.      if (!defined($first)  || $first  eq '' || 
               $ENV{'course.'.$cid.'.num'}.':classlist:'.          !defined($last)   || $last   eq '' || 
                       &escape($uname.':'.$udom).'='.          !defined($uid)    || $uid    eq '' || 
                       &escape($end.':'.$start),          !defined($middle) || $middle eq '' || 
               $ENV{'course.'.$cid.'.home'});          !defined($gene)   || $gene   eq '') {
           # They did not supply us with enough data to enroll the student, so
           # we need to pick up more information.
           my %tmp = &get('environment',
                          ['firstname','middlename','lastname', 'generation','id']
                          ,$udom,$uname);
   
           #foreach (keys(%tmp)) {
           #    &logthis("key $_ = ".$tmp{$_});
           #}
           $first  = $tmp{'firstname'}  if (!defined($first)  || $first  eq '');
           $middle = $tmp{'middlename'} if (!defined($middle) || $middle eq '');
           $last   = $tmp{'lastname'}   if (!defined($last)   || $last eq '');
           $gene   = $tmp{'generation'} if (!defined($gene)   || $gene eq '');
           $uid    = $tmp{'id'}         if (!defined($uid)    || $uid  eq '');
       }
       my $fullname = &format_name($first,$middle,$last,$gene,'lastname');
       my $reply=cput('classlist',
      {"$uname:$udom" => 
    join(':',$end,$start,$uid,$usec,$fullname,$type,$locktype) },
      $cdom,$cnum);
     unless (($reply eq 'ok') || ($reply eq 'delayed')) {      unless (($reply eq 'ok') || ($reply eq 'delayed')) {
  return 'error: '.$reply;   return 'error: '.$reply;
     }      }
 # ---------------------------------------------------- Add student role to user      # Add student role to user
     my $uurl='/'.$cid;      my $uurl='/'.$cid;
     $uurl=~s/\_/\//g;      $uurl=~s/\_/\//g;
     if ($usec) {      if ($usec) {
Line 1839  sub modifystudent { Line 3646  sub modifystudent {
     return &assignrole($udom,$uname,$uurl,'st',$end,$start);      return &assignrole($udom,$uname,$uurl,'st',$end,$start);
 }  }
   
   sub format_name {
       my ($firstname,$middlename,$lastname,$generation,$first)=@_;
       my $name;
       if ($first ne 'lastname') {
    $name=$firstname.' '.$middlename.' '.$lastname.' '.$generation;
       } else {
    if ($lastname=~/\S/) {
       $name.= $lastname.' '.$generation.', '.$firstname.' '.$middlename;
       $name=~s/\s+,/,/;
    } else {
       $name.= $firstname.' '.$middlename.' '.$generation;
    }
       }
       $name=~s/^\s+//;
       $name=~s/\s+$//;
       $name=~s/\s+/ /g;
       return $name;
   }
   
 # ------------------------------------------------- Write to course preferences  # ------------------------------------------------- Write to course preferences
   
 sub writecoursepref {  sub writecoursepref {
Line 1861  sub writecoursepref { Line 3687  sub writecoursepref {
 # ---------------------------------------------------------- Make/modify course  # ---------------------------------------------------------- Make/modify course
   
 sub createcourse {  sub createcourse {
     my ($udom,$description,$url)=@_;      my ($udom,$description,$url,$course_server,$nonstandard,$inst_code)=@_;
     $url=&declutter($url);      $url=&declutter($url);
     my $cid='';      my $cid='';
     unless (&allowed('ccc',$ENV{'user.domain'})) {      unless (&allowed('ccc',$udom)) {
         return 'refused';  
     }  
     unless ($udom eq $ENV{'user.domain'}) {  
         return 'refused';          return 'refused';
     }      }
 # ------------------------------------------------------------------- Create ID  # ------------------------------------------------------------------- Create ID
    my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).     my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
        unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};         unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
 # ----------------------------------------------- Make sure that does not exist  # ----------------------------------------------- Make sure that does not exist
    my $uhome=&homeserver($uname,$udom);     my $uhome=&homeserver($uname,$udom,'true');
    unless (($uhome eq '') || ($uhome eq 'no_host')) {     unless (($uhome eq '') || ($uhome eq 'no_host')) {
        $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).         $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
         unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};          unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
        $uhome=&homeserver($uname,$udom);                $uhome=&homeserver($uname,$udom,'true');       
        unless (($uhome eq '') || ($uhome eq 'no_host')) {         unless (($uhome eq '') || ($uhome eq 'no_host')) {
            return 'error: unable to generate unique course-ID';             return 'error: unable to generate unique course-ID';
        }          } 
    }     }
   # ------------------------------------------------ Check supplied server name
       $course_server = $ENV{'user.homeserver'} if (! defined($course_server));
       if (! exists($libserv{$course_server})) {
           return 'error:bad server name '.$course_server;
       }
 # ------------------------------------------------------------- Make the course  # ------------------------------------------------------------- Make the course
     my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',      my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
                       $ENV{'user.home'});                        $course_server);
     unless ($reply eq 'ok') { return 'error: '.$reply; }      unless ($reply eq 'ok') { return 'error: '.$reply; }
     $uhome=&homeserver($uname,$udom);      $uhome=&homeserver($uname,$udom,'true');
     if (($uhome eq '') || ($uhome eq 'no_host')) {       if (($uhome eq '') || ($uhome eq 'no_host')) { 
  return 'error: no such course';   return 'error: no such course';
     }      }
   # ----------------------------------------------------------------- Course made
   # log existence
       &courseidput($udom,&escape($udom.'_'.$uname).'='.&escape($description).
                    '='.&escape($inst_code),$uhome);
       &flushcourselogs();
   # set toplevel url
       my $topurl=$url;
       unless ($nonstandard) {
   # ------------------------------------------ For standard courses, make top url
           my $mapurl=&clutter($url);
           if ($mapurl eq '/res/') { $mapurl=''; }
           $ENV{'form.initmap'}=(<<ENDINITMAP);
   <map>
   <resource id="1" type="start"></resource>
   <resource id="2" src="$mapurl"></resource>
   <resource id="3" type="finish"></resource>
   <link index="1" from="1" to="2"></link>
   <link index="2" from="2" to="3"></link>
   </map>
   ENDINITMAP
           $topurl=&declutter(
           &finishuserfileupload($uname,$udom,$uhome,'initmap','default.sequence')
                             );
       }
   # ----------------------------------------------------------- Write preferences
     &writecoursepref($udom.'_'.$uname,      &writecoursepref($udom.'_'.$uname,
                      ('description' => $description,                       ('description' => $description,
                       'url'         => $url));                        'url'         => $topurl));
     return '/'.$udom.'/'.$uname;      return '/'.$udom.'/'.$uname;
 }  }
   
 # ---------------------------------------------------------- Assign Custom Role  # ---------------------------------------------------------- Assign Custom Role
   
 sub assigncustomrole {  sub assigncustomrole {
     my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;      my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start,$deleteflag)=@_;
     return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,      return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
                        $end,$start);                         $end,$start,$deleteflag);
 }  }
   
 # ----------------------------------------------------------------- Revoke Role  # ----------------------------------------------------------------- Revoke Role
   
 sub revokerole {  sub revokerole {
     my ($udom,$uname,$url,$role)=@_;      my ($udom,$uname,$url,$role,$deleteflag)=@_;
     my $now=time;      my $now=time;
     return &assignrole($udom,$uname,$url,$role,$now);      return &assignrole($udom,$uname,$url,$role,$now,$deleteflag);
 }  }
   
 # ---------------------------------------------------------- Revoke Custom Role  # ---------------------------------------------------------- Revoke Custom Role
   
 sub revokecustomrole {  sub revokecustomrole {
     my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;      my ($udom,$uname,$url,$rdom,$rnam,$rolename,$deleteflag)=@_;
     my $now=time;      my $now=time;
     return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);      return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now,
              $deleteflag);
   }
   
   # ------------------------------------------------------------ Disk usage
   sub diskusage {
       my ($udom,$uname,$directoryRoot)=@_;
       $directoryRoot =~ s/\/$//;
       my $listing=&reply('du:'.$directoryRoot,homeserver($uname,$udom));
       return $listing;
   }
   
   sub is_locked {
       my ($file_name, $domain, $user) = @_;
       my @check;
       my $is_locked;
       push @check, $file_name;
       my %locked = &Apache::lonnet::get('file_permissions',\@check,
                                           $ENV{'user.domain'},$ENV{'user.name'});
       if (ref($locked{$file_name}) eq 'ARRAY') {
           $is_locked = 'true';
       } else {
           $is_locked = 'false';
       }
   }
   
   # ------------------------------------------------------------- Mark as Read Only
   
   sub mark_as_readonly {
       my ($domain,$user,$files,$what) = @_;
       my %current_permissions = &Apache::lonnet::dump('file_permissions',$domain,$user);
       foreach my $file (@{$files}) {
           push(@{$current_permissions{$file}},$what);
       }
       &Apache::lonnet::put('file_permissions',\%current_permissions,$domain,$user);
       return;
   }
   
   #--------------------------------------------------------------Get Marked as Read Only
   
   sub get_marked_as_readonly {
       my ($domain,$user,$what) = @_;
       my %current_permissions = &Apache::lonnet::dump('file_permissions',$domain,$user);
       my @readonly_files;
       while (my ($file_name,$value) = each(%current_permissions)) {
           if (ref($value) eq "ARRAY"){
               foreach my $stored_what (@{$value}) {
                   if ($stored_what eq $what) {
                       push(@readonly_files, $file_name);
                   } elsif (!defined($what)) {
                       push(@readonly_files, $file_name);
                   }
               }
           } 
       }
       return @readonly_files;
   }
   
   # ------------------------------------------------------------ Unmark as Read Only
   
   sub unmark_as_readonly {
       # unmarks all files locked by $what 
       # for portfolio submissions, $what contains $crsid and $symb
       my ($domain,$user,$what) = @_;
       my %current_permissions = &Apache::lonnet::dump('file_permissions',$domain,$user);
       my @readonly_files = &Apache::lonnet::get_marked_as_readonly($domain,$user,$what);
       foreach my $file(@readonly_files){
           my $current_locks = $current_permissions{$file};
           my @new_locks;
           my @del_keys;
           if (ref($current_locks) eq "ARRAY"){
               foreach my $locker (@{$current_locks}) {
                   unless ($locker eq $what) {
                       push(@new_locks, $what);
                   }
               }
               if (@new_locks > 0) {
                   $current_permissions{$file} = \@new_locks;
               } else {
                   push(@del_keys, $file);
                   &Apache::lonnet::del('file_permissions',\@del_keys, $domain, $user);
                   delete $current_permissions{$file};
               }
           }
       }
       &Apache::lonnet::put('file_permissions',\%current_permissions,$domain,$user);
       return;
 }  }
   
 # ------------------------------------------------------------ Directory lister  # ------------------------------------------------------------ Directory lister
   
 sub dirlist {  sub dirlist {
     my $uri=shift;      my ($uri,$userdomain,$username,$alternateDirectoryRoot)=@_;
   
     $uri=~s/^\///;      $uri=~s/^\///;
     $uri=~s/\/$//;      $uri=~s/\/$//;
     my ($res,$udom,$uname,@rest)=split(/\//,$uri);      my ($udom, $uname);
     if ($udom) {      (undef,$udom,$uname)=split(/\//,$uri);
      if ($uname) {      if(defined($userdomain)) {
        my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,          $udom = $userdomain;
                       homeserver($uname,$udom));      }
        return split(/:/,$listing);      if(defined($username)) {
      } else {          $uname = $username;
        my $tryserver;      }
        my %allusers=();  
        foreach $tryserver (keys %libserv) {      my $dirRoot = $perlvar{'lonDocRoot'};
   if ($hostdom{$tryserver} eq $udom) {      if(defined($alternateDirectoryRoot)) {
              my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.$udom,          $dirRoot = $alternateDirectoryRoot;
        $tryserver);          $dirRoot =~ s/\/$//;
              if (($listing ne 'no_such_dir') && ($listing ne 'empty')      }
               && ($listing ne 'con_lost')) {  
                 foreach (split(/:/,$listing)) {      if($udom) {
                   my ($entry,@stat)=split(/&/,$_);          if($uname) {
                   $allusers{$entry}=1;              my $listing=reply('ls:'.$dirRoot.'/'.$uri,
                                 homeserver($uname,$udom));
               return split(/:/,$listing);
           } elsif(!defined($alternateDirectoryRoot)) {
               my $tryserver;
               my %allusers=();
               foreach $tryserver (keys %libserv) {
                   if($hostdom{$tryserver} eq $udom) {
                       my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.
                                         $udom, $tryserver);
                       if (($listing ne 'no_such_dir') && ($listing ne 'empty')
                           && ($listing ne 'con_lost')) {
                           foreach (split(/:/,$listing)) {
                               my ($entry,@stat)=split(/&/,$_);
                               $allusers{$entry}=1;
                           }
                       }
                 }                  }
              }              }
   }              my $alluserstr='';
        }              foreach (sort keys %allusers) {
        my $alluserstr='';                  $alluserstr.=$_.'&user:';
        foreach (sort keys %allusers) {              }
            $alluserstr.=$_.'&user:';              $alluserstr=~s/:$//;
        }              return split(/:/,$alluserstr);
        $alluserstr=~s/:$//;          } else {
        return split(/:/,$alluserstr);              my @emptyResults = ();
      }               push(@emptyResults, 'missing user name');
    } else {              return split(':',@emptyResults);
        my $tryserver;          }
        my %alldom=();      } elsif(!defined($alternateDirectoryRoot)) {
        foreach $tryserver (keys %libserv) {          my $tryserver;
    $alldom{$hostdom{$tryserver}}=1;          my %alldom=();
        }          foreach $tryserver (keys %libserv) {
        my $alldomstr='';              $alldom{$hostdom{$tryserver}}=1;
        foreach (sort keys %alldom) {          }
           $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';          my $alldomstr='';
        }          foreach (sort keys %alldom) {
        $alldomstr=~s/:$//;              $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'/&domain:';
        return split(/:/,$alldomstr);                 }
    }          $alldomstr=~s/:$//;
           return split(/:/,$alldomstr);       
       } else {
           my @emptyResults = ();
           push(@emptyResults, 'missing domain');
           return split(':',@emptyResults);
       }
   }
   
   # --------------------------------------------- GetFileTimestamp
   # This function utilizes dirlist and returns the date stamp for
   # when it was last modified.  It will also return an error of -1
   # if an error occurs
   
   ##
   ## FIXME: This subroutine assumes its caller knows something about the
   ## directory structure of the home server for the student ($root).
   ## Not a good assumption to make.  Since this is for looking up files
   ## in user directories, the full path should be constructed by lond, not
   ## whatever machine we request data from.
   ##
   sub GetFileTimestamp {
       my ($studentDomain,$studentName,$filename,$root)=@_;
       $studentDomain=~s/\W//g;
       $studentName=~s/\W//g;
       my $subdir=$studentName.'__';
       $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
       my $proname="$studentDomain/$subdir/$studentName";
       $proname .= '/'.$filename;
       my ($fileStat) = &Apache::lonnet::dirlist($proname, $studentDomain, 
                                                 $studentName, $root);
       my @stats = split('&', $fileStat);
       if($stats[0] ne 'empty' && $stats[0] ne 'no_such_dir') {
           # @stats contains first the filename, then the stat output
           return $stats[10]; # so this is 10 instead of 9.
       } else {
           return -1;
       }
 }  }
   
 # -------------------------------------------------------- Value of a Condition  # -------------------------------------------------------- Value of a Condition
   
 sub directcondval {  sub directcondval {
     my $number=shift;      my $number=shift;
       if (!defined($ENV{'user.state.'.$ENV{'request.course.id'}})) {
    &Apache::lonuserstate::evalstate();
       }
     if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {      if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
        return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);         return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
     } else {      } else {
Line 2023  sub condval { Line 4019  sub condval {
     return $result;      return $result;
 }  }
   
 # --------------------------------------------------------- Value of a Variable  # ---------------------------------------------------- Devalidate courseresdata
   
   sub devalidatecourseresdata {
       my ($coursenum,$coursedomain)=@_;
       my $hashid=$coursenum.':'.$coursedomain;
       &devalidate_cache(\%courseresdatacache,$hashid,'courseres');
   }
   
   # --------------------------------------------------- Course Resourcedata Query
   
   sub courseresdata {
       my ($coursenum,$coursedomain,@which)=@_;
       my $coursehom=&homeserver($coursenum,$coursedomain);
       my $hashid=$coursenum.':'.$coursedomain;
       my ($result,$cached)=&is_cached(\%courseresdatacache,$hashid,'courseres');
       unless (defined($cached)) {
    my %dumpreply=&dump('resourcedata',$coursedomain,$coursenum);
    $result=\%dumpreply;
    my ($tmp) = keys(%dumpreply);
    if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
       &do_cache(\%courseresdatacache,$hashid,$result,'courseres');
    } elsif ($tmp =~ /^(con_lost|no_such_host)/) {
       return $tmp;
    } elsif ($tmp =~ /^(error)/) {
       $result=undef;
       &do_cache(\%courseresdatacache,$hashid,$result,'courseres');
    }
       }
       foreach my $item (@which) {
    if (defined($result->{$item})) {
       return $result->{$item};
    }
       }
       return undef;
   }
   
   #
   # EXT resource caching routines
   #
   
   sub clear_EXT_cache_status {
       &delenv('cache.EXT.');
   }
   
   sub EXT_cache_status {
       my ($target_domain,$target_user) = @_;
       my $cachename = 'cache.EXT.'.$target_user.'.'.$target_domain;
       if (exists($ENV{$cachename}) && ($ENV{$cachename}+600) > time) {
           # We know already the user has no data
           return 1;
       } else {
           return 0;
       }
   }
   
   sub EXT_cache_set {
       my ($target_domain,$target_user) = @_;
       my $cachename = 'cache.EXT.'.$target_user.'.'.$target_domain;
       &appenv($cachename => time);
   }
   
   # --------------------------------------------------------- Value of a Variable
 sub EXT {  sub EXT {
     my ($varname,$symbparm)=@_;      my ($varname,$symbparm,$udom,$uname,$usection,$recurse)=@_;
   
     unless ($varname) { return ''; }      unless ($varname) { return ''; }
       #get real user name/domain, courseid and symb
       my $courseid;
       my $publicuser;
       if ($symbparm) {
    $symbparm=&get_symb_from_alias($symbparm);
       }
       if (!($uname && $udom)) {
         (my $cursymb,$courseid,$udom,$uname,$publicuser)=
     &Apache::lonxml::whichuser($symbparm);
         if (!$symbparm) { $symbparm=$cursymb; }
       } else {
    $courseid=$ENV{'request.course.id'};
       }
     my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);      my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
     my $rest;      my $rest;
     if ($therest[0]) {      if (defined($therest[0])) {
        $rest=join('.',@therest);         $rest=join('.',@therest);
     } else {      } else {
        $rest='';         $rest='';
     }      }
   
     my $qualifierrest=$qualifier;      my $qualifierrest=$qualifier;
     if ($rest) { $qualifierrest.='.'.$rest; }      if ($rest) { $qualifierrest.='.'.$rest; }
     my $spacequalifierrest=$space;      my $spacequalifierrest=$space;
Line 2042  sub EXT { Line 4113  sub EXT {
     if ($realm eq 'user') {      if ($realm eq 'user') {
 # --------------------------------------------------------------- user.resource  # --------------------------------------------------------------- user.resource
  if ($space eq 'resource') {   if ($space eq 'resource') {
     my %restored=&restore();      if (defined($Apache::lonhomework::parsing_a_problem)) {
             return $restored{$qualifierrest};   return $Apache::lonhomework::history{$qualifierrest};
       } else {
    my %restored;
    if ($publicuser || $ENV{'request.state'} eq 'construct') {
       %restored=&tmprestore($symbparm,$courseid,$udom,$uname);
    } else {
       %restored=&restore($symbparm,$courseid,$udom,$uname);
    }
    return $restored{$qualifierrest};
       }
 # ----------------------------------------------------------------- user.access  # ----------------------------------------------------------------- user.access
         } elsif ($space eq 'access') {          } elsif ($space eq 'access') {
       # FIXME - not supporting calls for a specific user
             return &allowed($qualifier,$rest);              return &allowed($qualifier,$rest);
 # ------------------------------------------ user.preferences, user.environment  # ------------------------------------------ user.preferences, user.environment
         } elsif (($space eq 'preferences') || ($space eq '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;
    if (!$publicuser) {
       %returnhash=&userenvironment($udom,$uname,
    $qualifierrest);
    }
    return $returnhash{$qualifierrest};
       }
 # ----------------------------------------------------------------- user.course  # ----------------------------------------------------------------- user.course
         } elsif ($space eq 'course') {          } elsif ($space eq 'course') {
       # FIXME - not supporting calls for a specific user
             return $ENV{join('.',('request.course',$qualifier))};              return $ENV{join('.',('request.course',$qualifier))};
 # ------------------------------------------------------------------- user.role  # ------------------------------------------------------------------- user.role
         } elsif ($space eq 'role') {          } elsif ($space eq 'role') {
       # FIXME - not supporting calls for a specific user
             my ($role,$where)=split(/\./,$ENV{'request.role'});              my ($role,$where)=split(/\./,$ENV{'request.role'});
             if ($qualifier eq 'value') {              if ($qualifier eq 'value') {
  return $role;   return $role;
Line 2063  sub EXT { Line 4156  sub EXT {
             }              }
 # ----------------------------------------------------------------- user.domain  # ----------------------------------------------------------------- user.domain
         } elsif ($space eq 'domain') {          } elsif ($space eq 'domain') {
             return $ENV{'user.domain'};              return $udom;
 # ------------------------------------------------------------------- user.name  # ------------------------------------------------------------------- user.name
         } elsif ($space eq 'name') {          } elsif ($space eq 'name') {
             return $ENV{'user.name'};              return $uname;
 # ---------------------------------------------------- Any other user namespace  # ---------------------------------------------------- Any other user namespace
         } else {          } else {
             my $item=($rest)?$qualifier.'.'.$rest:$qualifier;      my %reply;
             my %reply=&get($space,[$item]);      if (!$publicuser) {
             return $reply{$item};   %reply=&get($space,[$qualifierrest],$udom,$uname);
       }
       return $reply{$qualifierrest};
         }          }
     } elsif ($realm eq 'request') {      } elsif ($realm eq 'query') {
   # ---------------------------------------------- pull stuff out of query string
           &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
    [$spacequalifierrest]);
    return $ENV{'form.'.$spacequalifierrest}; 
      } elsif ($realm eq 'request') {
 # ------------------------------------------------------------- request.browser  # ------------------------------------------------------------- request.browser
         if ($space eq 'browser') {          if ($space eq 'browser') {
     return $ENV{'browser.'.$qualifier};      if ($qualifier eq 'textremote') {
    if (&mt('textual_remote_display') eq 'on') {
       return 1;
    } else {
       return 0;
    }
       } else {
    return $ENV{'browser.'.$qualifier};
       }
 # ------------------------------------------------------------ request.filename  # ------------------------------------------------------------ request.filename
         } else {          } else {
             return $ENV{'request.'.$spacequalifierrest};              return $ENV{'request.'.$spacequalifierrest};
         }          }
     } elsif ($realm eq 'course') {      } elsif ($realm eq 'course') {
 # ---------------------------------------------------------- course.description  # ---------------------------------------------------------- course.description
         return $ENV{'course.'.$ENV{'request.course.id'}.'.'.          return $ENV{'course.'.$courseid.'.'.$spacequalifierrest};
                               $spacequalifierrest};  
     } elsif ($realm eq 'resource') {      } elsif ($realm eq 'resource') {
        if ($ENV{'request.course.id'}) {  
   
 #   print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;   my $section;
    if (defined($courseid) && $courseid eq $ENV{'request.course.id'}) {
       if (!$symbparm) { $symbparm=&symbread(); }
    }
    if ($symbparm && defined($courseid) && 
       $courseid eq $ENV{'request.course.id'}) {
   
       #print '<br>'.$space.' - '.$qualifier.' - '.$spacequalifierrest;
   
 # ----------------------------------------------------- Cascading lookup scheme  # ----------------------------------------------------- Cascading lookup scheme
          my $symbp;      my $symbp=$symbparm;
          if ($symbparm) {      my $mapp=(&decode_symb($symbp))[0];
             $symbp=$symbparm;  
  } else {  
             $symbp=&symbread();  
          }              
          my $mapp=(split(/\_\_\_/,$symbp))[0];  
   
          my $symbparm=$symbp.'.'.$spacequalifierrest;  
          my $mapparm=$mapp.'___(all).'.$spacequalifierrest;  
   
          my $seclevel=  
             $ENV{'request.course.id'}.'.['.  
  $ENV{'request.course.sec'}.'].'.$spacequalifierrest;  
          my $seclevelr=  
             $ENV{'request.course.id'}.'.['.  
  $ENV{'request.course.sec'}.'].'.$symbparm;  
          my $seclevelm=  
             $ENV{'request.course.id'}.'.['.  
  $ENV{'request.course.sec'}.'].'.$mapparm;  
   
          my $courselevel=  
             $ENV{'request.course.id'}.'.'.$spacequalifierrest;  
          my $courselevelr=  
             $ENV{'request.course.id'}.'.'.$symbparm;  
          my $courselevelm=  
             $ENV{'request.course.id'}.'.'.$mapparm;  
   
 # ----------------------------------------------------------- first, check user      my $symbparm=$symbp.'.'.$spacequalifierrest;
          my %resourcedata=get('resourcedata',      my $mapparm=$mapp.'___(all).'.$spacequalifierrest;
                            [$courselevelr,$courselevelm,$courselevel]);  
          if (($resourcedata{$courselevelr}!~/^error\:/) &&  
              ($resourcedata{$courselevelr}!~/^con_lost/)) {  
   
          if ($resourcedata{$courselevelr}) {   
             return $resourcedata{$courselevelr}; }  
          if ($resourcedata{$courselevelm}) {   
             return $resourcedata{$courselevelm}; }  
          if ($resourcedata{$courselevel}) { return $resourcedata{$courselevel}; }  
   
       } else {      if (($ENV{'user.name'} eq $uname) &&
   if ($resourcedata{$courselevelr}!~/No such file/) {   ($ENV{'user.domain'} eq $udom)) {
     &logthis("<font color=blue>WARNING:".   $section=$ENV{'request.course.sec'};
    " Trying to get resource data for ".$ENV{'user.name'}." at "      } else {
                    .$ENV{'user.domain'}.": ".$resourcedata{$courselevelr}.   if (! defined($usection)) {
                  "</font>");      $section=&getsection($udom,$uname,$courseid);
   }   } else {
       }      $section = $usection;
    }
       }
   
       my $seclevel=$courseid.'.['.$section.'].'.$spacequalifierrest;
       my $seclevelr=$courseid.'.['.$section.'].'.$symbparm;
       my $seclevelm=$courseid.'.['.$section.'].'.$mapparm;
   
       my $courselevel=$courseid.'.'.$spacequalifierrest;
       my $courselevelr=$courseid.'.'.$symbparm;
       my $courselevelm=$courseid.'.'.$mapparm;
   
   # ----------------------------------------------------------- first, check user
       #most student don\'t have any data set, check if there is some data
       if (! &EXT_cache_status($udom,$uname)) {
    my $hashid="$udom:$uname";
    my ($result,$cached)=&is_cached(\%userresdatacache,$hashid,
    'userres');
    if (!defined($cached)) {
       my %resourcedata=&dump('resourcedata',$udom,$uname);
       $result=\%resourcedata;
       &do_cache(\%userresdatacache,$hashid,$result,'userres');
    }
    my ($tmp)=keys(%$result);
    if (($tmp!~/^error\:/) && ($tmp!~/^con_lost/)) {
       if ($$result{$courselevelr}) {
    return $$result{$courselevelr}; }
       if ($$result{$courselevelm}) {
    return $$result{$courselevelm}; }
       if ($$result{$courselevel}) {
    return $$result{$courselevel}; }
    } else {
       #error 2 occurs when the .db doesn't exist
       if ($tmp!~/error: 2 /) {
    &logthis("<font color=blue>WARNING:".
    " Trying to get resource data for ".
    $uname." at ".$udom.": ".
    $tmp."</font>");
       } elsif ($tmp=~/error: 2 /) {
    &EXT_cache_set($udom,$uname);
       } elsif ($tmp =~ /^(con_lost|no_such_host)/) {
    return $tmp;
       }
    }
       }
   
 # -------------------------------------------------------- second, check course  # -------------------------------------------------------- second, check course
   
         my $reply=&reply('get:'.      my $coursereply=&courseresdata($ENV{'course.'.$courseid.'.num'},
               $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.     $ENV{'course.'.$courseid.'.domain'},
               $ENV{'course.'.$ENV{'request.course.id'}.'.num'}.     ($seclevelr,$seclevelm,$seclevel,
       ':resourcedata:'.      $courselevelr,$courselevelm,
    &escape($seclevelr).'&'.&escape($seclevelm).'&'.&escape($seclevel).'&'.      $courselevel));
    &escape($courselevelr).'&'.&escape($courselevelm).'&'.&escape($courselevel),      if (defined($coursereply)) { return $coursereply; }
    $ENV{'course.'.$ENV{'request.course.id'}.'.home'});  
       if ($reply!~/^error\:/) {  
   foreach (split(/\&/,$reply)) {  
       if ($_) { return &unescape($_); }  
           }  
       }  
       if (($reply=~/^con_lost/) || ($reply=~/^error\:/)) {  
   &logthis("<font color=blue>WARNING:".  
                 " Getting ".$reply." asking for ".$varname." for ".  
                 $ENV{'course.'.$ENV{'request.course.id'}.'.num'}.  
                 ' at '.  
                 $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.  
                 ' from '.  
                 $ENV{'course.'.$ENV{'request.course.id'}.'.home'}.  
                  "</font>");  
       }  
 # ------------------------------------------------------ third, check map parms  # ------------------------------------------------------ third, check map parms
        my %parmhash=();      my %parmhash=();
        my $thisparm='';             my $thisparm='';
        if (tie(%parmhash,'GDBM_File',      if (tie(%parmhash,'GDBM_File',
           $ENV{'request.course.fn'}.'_parms.db',&GDBM_READER,0640)) {      $ENV{'request.course.fn'}.'_parms.db',
            $thisparm=$parmhash{$symbparm};      &GDBM_READER(),0640)) {
    untie(%parmhash);   $thisparm=$parmhash{$symbparm};
        }   untie(%parmhash);
        if ($thisparm) { return $thisparm; }      }
      }      if ($thisparm) { return $thisparm; }
         }
 # --------------------------------------------- last, look in resource metadata  # --------------------------------------------- last, look in resource metadata
   
       $spacequalifierrest=~s/\./\_/;   $spacequalifierrest=~s/\./\_/;
       my $metadata=&metadata($ENV{'request.filename'},$spacequalifierrest);   my $filename;
       if ($metadata) { return $metadata; }   if (!$symbparm) { $symbparm=&symbread(); }
       $metadata=&metadata($ENV{'request.filename'},   if ($symbparm) {
                                          'parameter_'.$spacequalifierrest);      $filename=(&decode_symb($symbparm))[2];
       if ($metadata) { return $metadata; }   } else {
       $filename=$ENV{'request.filename'};
    }
    my $metadata=&metadata($filename,$spacequalifierrest);
    if (defined($metadata)) { return $metadata; }
    $metadata=&metadata($filename,'parameter_'.$spacequalifierrest);
    if (defined($metadata)) { return $metadata; }
   
 # ------------------------------------------------------------------ Cascade up  # ------------------------------------------------------------------ Cascade up
    unless ($space eq '0') {
       unless ($space eq '0') {      my @parts=split(/_/,$space);
           my ($part,$id)=split(/\_/,$space);      my $id=pop(@parts);
           if ($id) {      my $part=join('_',@parts);
       my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,      if ($part eq '') { $part='0'; }
                                    $symbparm);      my $partgeneral=&EXT('resource.'.$part.'.'.$qualifierrest,
               if ($partgeneral) { return $partgeneral; }   $symbparm,$udom,$uname,$section,1);
           } else {      if (defined($partgeneral)) { return $partgeneral; }
               my $resourcegeneral=&EXT('resource.0.'.$qualifierrest,   }
                                        $symbparm);   if ($recurse) { return undef; }
               if ($resourcegeneral) { return $resourcegeneral; }   my $pack_def=&packages_tab_default($filename,$varname);
           }   if (defined($pack_def)) { return $pack_def; }
       }  
   
 # ---------------------------------------------------- Any other user namespace  # ---------------------------------------------------- Any other user namespace
     } elsif ($realm eq 'environment') {      } elsif ($realm eq 'environment') {
 # ----------------------------------------------------------------- environment  # ----------------------------------------------------------------- environment
         return $ENV{'environment.'.$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 ($realm eq 'system') {      } elsif ($realm eq 'system') {
 # ----------------------------------------------------------------- system.time  # ----------------------------------------------------------------- system.time
  if ($space eq 'time') {   if ($space eq 'time') {
Line 2213  sub EXT { Line 4331  sub EXT {
     return '';      return '';
 }  }
   
   sub packages_tab_default {
       my ($uri,$varname)=@_;
       my (undef,$part,$name)=split(/\./,$varname);
       my $packages=&metadata($uri,'packages');
       foreach my $package (split(/,/,$packages)) {
    my ($pack_type,$pack_part)=split(/_/,$package,2);
    if (defined($packagetab{"$pack_type&$name&default"})) {
       return $packagetab{"$pack_type&$name&default"};
    }
    if (defined($packagetab{$pack_type."_".$pack_part."&$name&default"})) {
       return $packagetab{$pack_type."_".$pack_part."&$name&default"};
    }
       }
       return undef;
   }
   
   sub add_prefix_and_part {
       my ($prefix,$part)=@_;
       my $keyroot;
       if (defined($prefix) && $prefix !~ /^__/) {
    # prefix that has a part already
    $keyroot=$prefix;
       } elsif (defined($prefix)) {
    # prefix that is missing a part
    if (defined($part)) { $keyroot='_'.$part.substr($prefix,1); }
       } else {
    # no prefix at all
    if (defined($part)) { $keyroot='_'.$part; }
       }
       return $keyroot;
   }
   
 # ---------------------------------------------------------------- Get metadata  # ---------------------------------------------------------------- Get metadata
   
 sub metadata {  sub metadata {
     my ($uri,$what,$liburi,$prefix,$depthcount)=@_;      my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
   
     $uri=&declutter($uri);      $uri=&declutter($uri);
       # if it is a non metadata possible uri return quickly
       if (($uri eq '') || 
    (($uri =~ m|^/*adm/|) && 
        ($uri !~ m|^adm/includes|) && ($uri !~ m|/bulletinboard$|)) ||
           ($uri =~ m|/$|) || ($uri =~ m|/.meta$|) || ($uri =~ /^~/) ||
    ($uri =~ m|home/[^/]+/public_html/|)) {
    return undef;
       }
     my $filename=$uri;      my $filename=$uri;
     $uri=~s/\.meta$//;      $uri=~s/\.meta$//;
 #  #
Line 2226  sub metadata { Line 4383  sub metadata {
 # Look at timestamp of caching  # Look at timestamp of caching
 # Everything is cached by the main uri, libraries are never directly cached  # Everything is cached by the main uri, libraries are never directly cached
 #  #
     unless (abs($metacache{$uri.':cachedtimestamp'}-time)<600) {      if (!defined($liburi)) {
    my ($result,$cached)=&is_cached(\%metacache,$uri,'meta');
    if (defined($cached)) { return $result->{':'.$what}; }
       }
       {
 #  #
 # Is this a recursive call for a library?  # Is this a recursive call for a library?
 #  #
    if (! exists($metacache{$uri})) {
       $metacache{$uri}={};
    }
         if ($liburi) {          if ($liburi) {
     $liburi=&declutter($liburi);      $liburi=&declutter($liburi);
             $filename=$liburi;              $filename=$liburi;
         }          } else {
       &devalidate_cache(\%metacache,$uri,'meta');
    }
         my %metathesekeys=();          my %metathesekeys=();
         unless ($filename=~/\.meta$/) { $filename.='.meta'; }          unless ($filename=~/\.meta$/) { $filename.='.meta'; }
  my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);   my $metastring;
         my $parser=HTML::TokeParser->new(\$metastring);   if ($uri !~ m|^uploaded/|) {
       my $file=&filelocation('',&clutter($filename));
       push(@{$metacache{$uri.'.file'}},$file);
       $metastring=&getfile($file);
    }
           my $parser=HTML::LCParser->new(\$metastring);
         my $token;          my $token;
         undef %metathesekeys;          undef %metathesekeys;
         while ($token=$parser->get_token) {          while ($token=$parser->get_token) {
            if ($token->[0] eq 'S') {      if ($token->[0] eq 'S') {
      if (defined($token->[2]->{'package'})) {   if (defined($token->[2]->{'package'})) {
 #  #
 # This is a package - get package info  # This is a package - get package info
 #  #
       my $package=$token->[2]->{'package'};      my $package=$token->[2]->{'package'};
       my $keyroot='';      my $keyroot=&add_prefix_and_part($prefix,$token->[2]->{'part'});
               if ($prefix) {      if (defined($token->[2]->{'id'})) { 
   $keyroot.='_'.$prefix;   $keyroot.='_'.$token->[2]->{'id'}; 
               } else {      }
                 if (defined($token->[2]->{'part'})) {       if ($metacache{$uri}->{':packages'}) {
                    $keyroot.='_'.$token->[2]->{'part'};    $metacache{$uri}->{':packages'}.=','.$package.$keyroot;
         }      } else {
       }   $metacache{$uri}->{':packages'}=$package.$keyroot;
               if (defined($token->[2]->{'id'})) {       }
                  $keyroot.='_'.$token->[2]->{'id'};       foreach (keys %packagetab) {
       }   my $part=$keyroot;
               if ($metacache{$uri.':packages'}) {   $part=~s/^\_//;
                  $metacache{$uri.':packages'}.=','.$package.$keyroot;   if ($_=~/^\Q$package\E\&/ || 
               } else {      $_=~/^\Q$package\E_0\&/) {
                  $metacache{$uri.':packages'}=$package.$keyroot;      my ($pack,$name,$subp)=split(/\&/,$_);
       }      # ignore package.tab specified default values
               foreach (keys %packagetab) {                              # here &package_tab_default() will fetch those
   if ($_=~/^$package\&/) {      if ($subp eq 'default') { next; }
       my ($pack,$name,$subp)=split(/\&/,$_);      my $value=$packagetab{$_};
                       my $value=$packagetab{$_};      my $unikey;
       my $part=$keyroot;      if ($pack =~ /_0$/) {
                       $part=~s/^\_//;   $unikey='parameter_0_'.$name;
                       if ($subp eq 'display') {   $part=0;
   $value.=' [Part: '.$part.']';      } else {
                       }   $unikey='parameter'.$keyroot.'_'.$name;
                       my $unikey='parameter'.$keyroot.'_'.$name;      }
                       $metathesekeys{$unikey}=1;      if ($subp eq 'display') {
                       $metacache{$uri.':'.$unikey.'.part'}=$part;   $value.=' [Part: '.$part.']';
                       unless       }
                        (defined($metacache{$uri.':'.$unikey.'.'.$subp})) {      $metacache{$uri}->{':'.$unikey.'.part'}=$part;
                          $metacache{$uri.':'.$unikey.'.'.$subp}=$value;      $metathesekeys{$unikey}=1;
       }      unless (defined($metacache{$uri}->{':'.$unikey.'.'.$subp})) {
                   }   $metacache{$uri}->{':'.$unikey.'.'.$subp}=$value;
               }      }
              } else {      if (defined($metacache{$uri}->{':'.$unikey.'.default'})) {
    $metacache{$uri}->{':'.$unikey}=
       $metacache{$uri}->{':'.$unikey.'.default'};
       }
    }
       }
    } else {
 #  #
 # This is not a package - some other kind of start tag  # This is not a package - some other kind of start tag
 #   #
               my $entry=$token->[1];      my $entry=$token->[1];
               my $unikey;      my $unikey;
               if ($entry eq 'import') {      if ($entry eq 'import') {
                  $unikey='';   $unikey='';
               } else {      } else {
                  $unikey=$entry;   $unikey=$entry;
       }      }
               if ($prefix) {      $unikey.=&add_prefix_and_part($prefix,$token->[2]->{'part'});
   $unikey.=$prefix;  
               } else {      if (defined($token->[2]->{'id'})) { 
                 if (defined($token->[2]->{'part'})) {    $unikey.='_'.$token->[2]->{'id'}; 
                    $unikey.='_'.$token->[2]->{'part'};       }
         }  
       }  
               if (defined($token->[2]->{'id'})) {   
                  $unikey.='_'.$token->[2]->{'id'};   
       }  
   
              if ($entry eq 'import') {      if ($entry eq 'import') {
 #  #
 # Importing a library here  # Importing a library here
 #                  #
  if (defined($depthcount)) { $depthcount++; } else    if ($depthcount<20) {
                                            { $depthcount=0; }      my $location=$parser->get_text('/import');
                  if ($depthcount<20) {      my $dir=$filename;
      foreach (split(/\,/,&metadata($uri,'keys',      $dir=~s|[^/]*$||;
                                   $parser->get_text('/import'),$unikey,      $location=&filelocation($dir,$location);
                                   $depthcount))) {      foreach (sort(split(/\,/,&metadata($uri,'keys',
                          $metathesekeys{$_}=1;         $location,$unikey,
      }         $depthcount+1)))) {
  }   $metacache{$uri}->{':'.$_}=$metacache{$uri}->{':'.$_};
              } else {    $metathesekeys{$_}=1;
       }
               if (defined($token->[2]->{'name'})) {    }
                  $unikey.='_'.$token->[2]->{'name'};       } else { 
       }  
               $metathesekeys{$unikey}=1;   if (defined($token->[2]->{'name'})) { 
               foreach (@{$token->[3]}) {      $unikey.='_'.$token->[2]->{'name'}; 
   $metacache{$uri.':'.$unikey.'.'.$_}=$token->[2]->{$_};   }
               }   $metathesekeys{$unikey}=1;
               unless (   foreach (@{$token->[3]}) {
                  $metacache{$uri.':'.$unikey}=$parser->get_text('/'.$entry)      $metacache{$uri}->{':'.$unikey.'.'.$_}=$token->[2]->{$_};
       ) { $metacache{$uri.':'.$unikey}=   }
       $metacache{$uri.':'.$unikey.'.default'};   my $internaltext=&HTML::Entities::decode($parser->get_text('/'.$entry));
       }   my $default=$metacache{$uri}->{':'.$unikey.'.default'};
    if ( $internaltext =~ /^\s*$/ && $default !~ /^\s*$/) {
    # only ws inside the tag, and not in default, so use default
    # as value
       $metacache{$uri}->{':'.$unikey}=$default;
    } else {
     # either something interesting inside the tag or default
                     # uninteresting
       $metacache{$uri}->{':'.$unikey}=$internaltext;
    }
 # end of not-a-package not-a-library import  # end of not-a-package not-a-library import
    }      }
 # end of not-a-package start tag  # end of not-a-package start tag
   }   }
 # the next is the end of "start tag"  # the next is the end of "start tag"
  }      }
        }   }
        $metacache{$uri.':keys'}=join(',',keys %metathesekeys);   my ($extension) = ($uri =~ /\.(\w+)$/);
        $metacache{$uri.':cachedtimestamp'}=time;   foreach my $key (sort(keys(%packagetab))) {
       #&logthis("extsion1 $extension $key !!");
       #no specific packages #how's our extension
       if ($key!~/^extension_\Q$extension\E&/) { next; }
       &metadata_create_package_def($uri,$key,'extension_'.$extension,
    \%metathesekeys);
    }
    if (!exists($metacache{$uri}->{':packages'})) {
       foreach my $key (sort(keys(%packagetab))) {
    #no specific packages well let's get default then
    if ($key!~/^default&/) { next; }
    &metadata_create_package_def($uri,$key,'default',
        \%metathesekeys);
       }
    }
   # are there custom rights to evaluate
    if ($metacache{$uri}->{':copyright'} eq 'custom') {
   
       #
       # Importing a rights file here
       #
       unless ($depthcount) {
    my $location=$metacache{$uri}->{':customdistributionfile'};
    my $dir=$filename;
    $dir=~s|[^/]*$||;
    $location=&filelocation($dir,$location);
    foreach (sort(split(/\,/,&metadata($uri,'keys',
      $location,'_rights',
      $depthcount+1)))) {
       $metacache{$uri}->{':'.$_}=$metacache{$uri}->{':'.$_};
       $metathesekeys{$_}=1;
    }
       }
    }
    $metacache{$uri}->{':keys'}=join(',',keys %metathesekeys);
    &metadata_generate_part0(\%metathesekeys,$metacache{$uri},$uri);
    $metacache{$uri}->{':allpossiblekeys'}=join(',',keys %metathesekeys);
    &do_cache(\%metacache,$uri,$metacache{$uri},'meta');
 # this is the end of "was not already recently cached  # this is the end of "was not already recently cached
     }      }
     return $metacache{$uri.':'.$what};      return $metacache{$uri}->{':'.$what};
   }
   
   sub metadata_create_package_def {
       my ($uri,$key,$package,$metathesekeys)=@_;
       my ($pack,$name,$subp)=split(/\&/,$key);
       if ($subp eq 'default') { next; }
       
       if (defined($metacache{$uri}->{':packages'})) {
    $metacache{$uri}->{':packages'}.=','.$package;
       } else {
    $metacache{$uri}->{':packages'}=$package;
       }
       my $value=$packagetab{$key};
       my $unikey;
       $unikey='parameter_0_'.$name;
       $metacache{$uri}->{':'.$unikey.'.part'}=0;
       $$metathesekeys{$unikey}=1;
       unless (defined($metacache{$uri}->{':'.$unikey.'.'.$subp})) {
    $metacache{$uri}->{':'.$unikey.'.'.$subp}=$value;
       }
       if (defined($metacache{$uri}->{':'.$unikey.'.default'})) {
    $metacache{$uri}->{':'.$unikey}=
       $metacache{$uri}->{':'.$unikey.'.default'};
       }
 }  }
   
   sub metadata_generate_part0 {
       my ($metadata,$metacache,$uri) = @_;
       my %allnames;
       foreach my $metakey (sort keys %$metadata) {
    if ($metakey=~/^parameter\_(.*)/) {
     my $part=$$metacache{':'.$metakey.'.part'};
     my $name=$$metacache{':'.$metakey.'.name'};
     if (! exists($$metadata{'parameter_0_'.$name.'.name'})) {
       $allnames{$name}=$part;
     }
    }
       }
       foreach my $name (keys(%allnames)) {
         $$metadata{"parameter_0_$name"}=1;
         my $key=":parameter_0_$name";
         $$metacache{"$key.part"}='0';
         $$metacache{"$key.name"}=$name;
         $$metacache{"$key.type"}=$$metacache{':parameter_'.
      $allnames{$name}.'_'.$name.
      '.type'};
         my $olddis=$$metacache{':parameter_'.$allnames{$name}.'_'.$name.
        '.display'};
         my $expr='\\[Part: '.$allnames{$name}.'\\]';
         $olddis=~s/\Q$expr\E/\[Part: 0\]/;
         $$metacache{"$key.display"}=$olddis;
       }
   }
   
   # ------------------------------------------------- Get the title of a resource
   
   sub gettitle {
       my $urlsymb=shift;
       my $symb=&symbread($urlsymb);
       if ($symb) {
    my ($result,$cached)=&is_cached(\%titlecache,$symb,'title',600);
    if (defined($cached)) { return $result; }
    my ($map,$resid,$url)=&decode_symb($symb);
    my $title='';
    my %bighash;
    if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
    &GDBM_READER(),0640)) {
       my $mapid=$bighash{'map_pc_'.&clutter($map)};
       $title=$bighash{'title_'.$mapid.'.'.$resid};
       untie %bighash;
    }
    $title=~s/\&colon\;/\:/gs;
    if ($title) {
       return &do_cache(\%titlecache,$symb,$title,'title');
    }
    $urlsymb=$url;
       }
       my $title=&metadata($urlsymb,'title');
       if (!$title) { $title=(split('/',$urlsymb))[-1]; }    
       return $title;
   }
       
 # ------------------------------------------------- Update symbolic store links  # ------------------------------------------------- Update symbolic store links
   
 sub symblist {  sub symblist {
     my ($mapname,%newhash)=@_;      my ($mapname,%newhash)=@_;
     $mapname=declutter($mapname);      $mapname=&deversion(&declutter($mapname));
     my %hash;      my %hash;
     if (($ENV{'request.course.fn'}) && (%newhash)) {      if (($ENV{'request.course.fn'}) && (%newhash)) {
         if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',          if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
                       &GDBM_WRCREAT,0640)) {                        &GDBM_WRCREAT(),0640)) {
     foreach (keys %newhash) {      foreach (keys %newhash) {
                 $hash{declutter($_)}=$mapname.'___'.$newhash{$_};                  $hash{declutter($_)}=$mapname.'___'.&deversion($newhash{$_});
             }              }
             if (untie(%hash)) {              if (untie(%hash)) {
  return 'ok';   return 'ok';
Line 2364  sub symblist { Line 4662  sub symblist {
     return 'error';      return 'error';
 }  }
   
   # --------------------------------------------------------------- Verify a symb
   
   sub symbverify {
       my ($symb,$thisurl)=@_;
       my $thisfn=$thisurl;
   # wrapper not part of symbs
       $thisfn=~s/^\/adm\/wrapper//;
       $thisfn=&declutter($thisfn);
   # direct jump to resource in page or to a sequence - will construct own symbs
       if ($thisfn=~/\.(page|sequence)$/) { return 1; }
   # check URL part
       my ($map,$resid,$url)=&decode_symb($symb);
   
       unless ($url eq $thisfn) { return 0; }
   
       $symb=&symbclean($symb);
       $thisurl=&deversion($thisurl);
       $thisfn=&deversion($thisfn);
   
       my %bighash;
       my $okay=0;
   
       if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                               &GDBM_READER(),0640)) {
           my $ids=$bighash{'ids_'.&clutter($thisurl)};
           unless ($ids) { 
              $ids=$bighash{'ids_/'.$thisurl};
           }
           if ($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/;
   
   # remove wrapper
   
       $symb=~s/(\_\_\_\d+\_\_\_)adm\/wrapper\/(res\/)*/$1/;
       return $symb;
   }
   
   # ---------------------------------------------- Split symb to find map and url
   
   sub encode_symb {
       my ($map,$resid,$url)=@_;
       return &symbclean(&declutter($map).'___'.$resid.'___'.&declutter($url));
   }
   
   sub decode_symb {
       my ($map,$resid,$url)=split(/\_\_\_/,shift);
       return (&fixversion($map),$resid,&fixversion($url));
   }
   
   sub fixversion {
       my $fn=shift;
       if ($fn=~/^(adm|uploaded|public)/) { return $fn; }
       my %bighash;
       my $uri=&clutter($fn);
       my $key=$ENV{'request.course.id'}.'_'.$uri;
   # is this cached?
       my ($result,$cached)=&is_cached(\%courseresversioncache,$key,
       'courseresversion',600);
       if (defined($cached)) { return $result; }
   # unfortunately not cached, or expired
       if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
       &GDBM_READER(),0640)) {
     if ($bighash{'version_'.$uri}) {
        my $version=$bighash{'version_'.$uri};
        unless (($version eq 'mostrecent') || 
       ($version==&getversion($uri))) {
     $uri=~s/\.(\w+)$/\.$version\.$1/;
        }
     }
     untie %bighash;
       }
       return &do_cache
    (\%courseresversioncache,$key,&declutter($uri),'courseresversion');
   }
   
   sub deversion {
       my $url=shift;
       $url=~s/\.\d+\.(\w+)$/\.$1/;
       return $url;
   }
   
 # ------------------------------------------------------ Return symb list entry  # ------------------------------------------------------ Return symb list entry
   
 sub symbread {  sub symbread {
     my $thisfn=shift;      my ($thisfn,$donotrecurse)=@_;
       my $cache_str='request.symbread.cached.'.$thisfn;
       if (defined($ENV{$cache_str})) { return $ENV{$cache_str}; }
   # no filename provided? try from environment
     unless ($thisfn) {      unless ($thisfn) {
         if ($ENV{'request.symb'}) { return $ENV{'request.symb'}; }          if ($ENV{'request.symb'}) {
       return $ENV{$cache_str}=&symbclean($ENV{'request.symb'});
    }
  $thisfn=$ENV{'request.filename'};   $thisfn=$ENV{'request.filename'};
     }      }
   # is that filename actually a symb? Verify, clean, and return
       if ($thisfn=~/\_\_\_\d+\_\_\_(.*)$/) {
    if (&symbverify($thisfn,$1)) {
       return $ENV{$cache_str}=&symbclean($thisfn);
    }
       }
     $thisfn=declutter($thisfn);      $thisfn=declutter($thisfn);
     my %hash;      my %hash;
     my %bighash;      my %bighash;
     my $syval='';      my $syval='';
     if (($ENV{'request.course.fn'}) && ($thisfn)) {      if (($ENV{'request.course.fn'}) && ($thisfn)) {
           my $targetfn = $thisfn;
           if ( ($thisfn =~ m/^uploaded\//) && ($thisfn !~ m/\.(page|sequence)$/) ) {
               $targetfn = 'adm/wrapper/'.$thisfn;
           }
         if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',          if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
                       &GDBM_READER,0640)) {                        &GDBM_READER(),0640)) {
     $syval=$hash{$thisfn};      $syval=$hash{$targetfn};
             untie(%hash);              untie(%hash);
         }          }
 # ---------------------------------------------------------- There was an entry  # ---------------------------------------------------------- There was an entry
Line 2387  sub symbread { Line 4805  sub symbread {
            unless ($syval=~/\_\d+$/) {             unless ($syval=~/\_\d+$/) {
        unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {         unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
                   &appenv('request.ambiguous' => $thisfn);                    &appenv('request.ambiguous' => $thisfn);
                   return '';    return $ENV{$cache_str}='';
                }                     }    
                $syval.=$1;                 $syval.=$1;
    }     }
         } else {          } else {
 # ------------------------------------------------------- Was not in symb table  # ------------------------------------------------------- Was not in symb table
            if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',             if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                             &GDBM_READER,0640)) {                              &GDBM_READER(),0640)) {
 # ---------------------------------------------- Get ID(s) for current resource  # ---------------------------------------------- Get ID(s) for current resource
               my $ids=$bighash{'ids_/res/'.$thisfn};                my $ids=$bighash{'ids_'.&clutter($thisfn)};
               unless ($ids) {                 unless ($ids) { 
                  $ids=$bighash{'ids_/'.$thisfn};                   $ids=$bighash{'ids_/'.$thisfn};
               }                }
                 unless ($ids) {
   # alias?
     $ids=$bighash{'mapalias_'.$thisfn};
                 }
               if ($ids) {                if ($ids) {
 # ------------------------------------------------------------------- Has ID(s)  # ------------------------------------------------------------------- Has ID(s)
                  my @possibilities=split(/\,/,$ids);                   my @possibilities=split(/\,/,$ids);
Line 2407  sub symbread { Line 4829  sub symbread {
 # ----------------------------------------------- There is only one possibility  # ----------------------------------------------- There is only one possibility
      my ($mapid,$resid)=split(/\./,$ids);       my ($mapid,$resid)=split(/\./,$ids);
                      $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;                       $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
                  } else {                   } elsif (!$donotrecurse) {
 # ------------------------------------------ There is more than one possibility  # ------------------------------------------ There is more than one possibility
                      my $realpossible=0;                       my $realpossible=0;
                      foreach (@possibilities) {                       foreach (@possibilities) {
Line 2422  sub symbread { Line 4844  sub symbread {
  }   }
                      }                       }
      if ($realpossible!=1) { $syval=''; }       if ($realpossible!=1) { $syval=''; }
                    } else {
                        $syval='';
                  }                   }
       }        }
               untie(%bighash)                untie(%bighash)
            }              }
         }          }
         if ($syval) {          if ($syval) {
            return $syval.'___'.$thisfn;       return $ENV{$cache_str}=&symbclean($syval.'___'.$thisfn);
         }          }
     }      }
     &appenv('request.ambiguous' => $thisfn);      &appenv('request.ambiguous' => $thisfn);
     return '';      return $ENV{$cache_str}='';
 }  }
   
 # ---------------------------------------------------------- Return random seed  # ---------------------------------------------------------- Return random seed
Line 2446  sub numval { Line 4870  sub numval {
     $txt=~tr/U-Z/0-5/;      $txt=~tr/U-Z/0-5/;
     $txt=~tr/u-z/0-5/;      $txt=~tr/u-z/0-5/;
     $txt=~s/\D//g;      $txt=~s/\D//g;
       if ($_64bit) { if ($txt > 2**32) { return -1; } }
     return int($txt);      return int($txt);
 }      }
   
   sub numval2 {
       my $txt=shift;
       $txt=~tr/A-J/0-9/;
       $txt=~tr/a-j/0-9/;
       $txt=~tr/K-T/0-9/;
       $txt=~tr/k-t/0-9/;
       $txt=~tr/U-Z/0-5/;
       $txt=~tr/u-z/0-5/;
       $txt=~s/\D//g;
       my @txts=split(/(\d\d\d\d\d\d\d\d\d)/,$txt);
       my $total;
       foreach my $val (@txts) { $total+=$val; }
       if ($_64bit) { if ($total > 2**32) { return -1; } }
       return int($total);
   }
   
   sub latest_rnd_algorithm_id {
       return '64bit3';
   }
   
   sub get_rand_alg {
       my ($courseid)=@_;
       if (!$courseid) { $courseid=(&Apache::lonxml::whichuser())[1]; }
       if ($courseid) {
    return $ENV{"course.$courseid.rndseed"};
       }
       return &latest_rnd_algorithm_id();
   }
   
   sub validCODE {
       my ($CODE)=@_;
       if (defined($CODE) && $CODE ne '' && $CODE =~ /^\w+$/) { return 1; }
       return 0;
   }
   
   sub getCODE {
       if (&validCODE($ENV{'form.CODE'})) { return $ENV{'form.CODE'}; }
       if (defined($Apache::lonhomework::parsing_a_problem) &&
    &validCODE($Apache::lonhomework::history{'resource.CODE'})) {
    return $Apache::lonhomework::history{'resource.CODE'};
       }
       return undef;
   }
   
 sub rndseed {  sub rndseed {
     my ($symb,$courseid,$domain,$username)=@_;      my ($symb,$courseid,$domain,$username)=@_;
   
       my ($wsymb,$wcourseid,$wdomain,$wusername)=&Apache::lonxml::whichuser();
     if (!$symb) {      if (!$symb) {
       unless ($symb=&symbread()) { return time; }   unless ($symb=$wsymb) { return time; }
       }
       if (!$courseid) { $courseid=$wcourseid; }
       if (!$domain) { $domain=$wdomain; }
       if (!$username) { $username=$wusername }
       my $which=&get_rand_alg();
       if (defined(&getCODE())) {
    return &rndseed_CODE_64bit($symb,$courseid,$domain,$username);
       } elsif ($which eq '64bit3') {
    return &rndseed_64bit3($symb,$courseid,$domain,$username);
       } elsif ($which eq '64bit2') {
    return &rndseed_64bit2($symb,$courseid,$domain,$username);
       } elsif ($which eq '64bit') {
    return &rndseed_64bit($symb,$courseid,$domain,$username);
       }
       return &rndseed_32bit($symb,$courseid,$domain,$username);
   }
   
   sub rndseed_32bit {
       my ($symb,$courseid,$domain,$username)=@_;
       {
    use integer;
    my $symbchck=unpack("%32C*",$symb) << 27;
    my $symbseed=numval($symb) << 22;
    my $namechck=unpack("%32C*",$username) << 17;
    my $nameseed=numval($username) << 12;
    my $domainseed=unpack("%32C*",$domain) << 7;
    my $courseseed=unpack("%32C*",$courseid);
    my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;
    #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
    #&Apache::lonxml::debug("rndseed :$num:$symb");
    if ($_64bit) { $num=(($num<<32)>>32); }
    return $num;
       }
   }
   
   sub rndseed_64bit {
       my ($symb,$courseid,$domain,$username)=@_;
       {
    use integer;
    my $symbchck=unpack("%32S*",$symb) << 21;
    my $symbseed=numval($symb) << 10;
    my $namechck=unpack("%32S*",$username);
   
    my $nameseed=numval($username) << 21;
    my $domainseed=unpack("%32S*",$domain) << 10;
    my $courseseed=unpack("%32S*",$courseid);
   
    my $num1=$symbchck+$symbseed+$namechck;
    my $num2=$nameseed+$domainseed+$courseseed;
    #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
    #&Apache::lonxml::debug("rndseed :$num:$symb");
    if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
    if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
    return "$num1,$num2";
       }
   }
   
   sub rndseed_64bit2 {
       my ($symb,$courseid,$domain,$username)=@_;
       {
    use integer;
    # strings need to be an even # of cahracters long, it it is odd the
           # last characters gets thrown away
    my $symbchck=unpack("%32S*",$symb.' ') << 21;
    my $symbseed=numval($symb) << 10;
    my $namechck=unpack("%32S*",$username.' ');
   
    my $nameseed=numval($username) << 21;
    my $domainseed=unpack("%32S*",$domain.' ') << 10;
    my $courseseed=unpack("%32S*",$courseid.' ');
   
    my $num1=$symbchck+$symbseed+$namechck;
    my $num2=$nameseed+$domainseed+$courseseed;
    #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
    #&Apache::lonxml::debug("rndseed :$num:$symb");
    return "$num1,$num2";
       }
   }
   
   sub rndseed_64bit3 {
       my ($symb,$courseid,$domain,$username)=@_;
       {
    use integer;
    # strings need to be an even # of cahracters long, it it is odd the
           # last characters gets thrown away
    my $symbchck=unpack("%32S*",$symb.' ') << 21;
    my $symbseed=numval2($symb) << 10;
    my $namechck=unpack("%32S*",$username.' ');
   
    my $nameseed=numval2($username) << 21;
    my $domainseed=unpack("%32S*",$domain.' ') << 10;
    my $courseseed=unpack("%32S*",$courseid.' ');
   
    my $num1=$symbchck+$symbseed+$namechck;
    my $num2=$nameseed+$domainseed+$courseseed;
    #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");
    #&Apache::lonxml::debug("rndseed :$num1:$num2:$_64bit");
    if ($_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
   
    return "$num1:$num2";
     }      }
     if (!$courseid) { $courseid=$ENV{'request.course.id'};}  }
     if (!$domain) {$domain=$ENV{'user.domain'};}  
     if (!$username) {$username=$ENV{'user.name'};}  sub rndseed_CODE_64bit {
       my ($symb,$courseid,$domain,$username)=@_;
     {      {
       use integer;   use integer;
       my $symbchck=unpack("%32C*",$symb) << 27;   my $symbchck=unpack("%32S*",$symb.' ') << 16;
       my $symbseed=numval($symb) << 22;   my $symbseed=numval2($symb);
       my $namechck=unpack("%32C*",$username) << 17;   my $CODEchck=unpack("%32S*",&getCODE().' ') << 16;
       my $nameseed=numval($username) << 12;   my $CODEseed=numval(&getCODE());
       my $domainseed=unpack("%32C*",$domain) << 7;   my $courseseed=unpack("%32S*",$courseid.' ');
       my $courseseed=unpack("%32C*",$courseid);   my $num1=$symbseed+$CODEchck;
       my $num=$symbseed+$nameseed+$domainseed+$courseseed+$namechck+$symbchck;   my $num2=$CODEseed+$courseseed+$symbchck;
       #uncommenting these lines can break things!   #&Apache::lonxml::debug("$symbseed:$CODEchck|$CODEseed:$courseseed:$symbchck");
       #&Apache::lonxml::debug("$symbseed:$nameseed;$domainseed|$courseseed;$namechck:$symbchck");   #&Apache::lonxml::debug("rndseed :$num1:$num2:$symb");
       #&Apache::lonxml::debug("rndseed :$num:$symb");   if ($_64bit) { $num1=(($num1<<32)>>32); }
       return $num;   if ($_64bit) { $num2=(($num2<<32)>>32); }
    return "$num1:$num2";
       }
   }
   
   sub setup_random_from_rndseed {
       my ($rndseed)=@_;
       if ($rndseed =~/([,:])/) {
    my ($num1,$num2)=split(/[,:]/,$rndseed);
    &Math::Random::random_set_seed(abs($num1),abs($num2));
       } else {
    &Math::Random::random_set_seed_from_phrase($rndseed);
       }
   }
   
   sub latest_receipt_algorithm_id {
       return 'receipt2';
   }
   
   sub recunique {
       my $fucourseid=shift;
       my $unique;
       if ($ENV{"course.$fucourseid.receiptalg"} eq 'receipt2') {
    $unique=$ENV{"course.$fucourseid.internal.encseed"};
       } else {
    $unique=$perlvar{'lonReceipt'};
     }      }
       return unpack("%32C*",$unique);
   }
   
   sub recprefix {
       my $fucourseid=shift;
       my $prefix;
       if ($ENV{"course.$fucourseid.receiptalg"} eq 'receipt2') {
    $prefix=$ENV{"course.$fucourseid.internal.encpref"};
       } else {
    $prefix=$perlvar{'lonHostID'};
       }
       return unpack("%32C*",$prefix);
 }  }
   
 sub ireceipt {  sub ireceipt {
     my ($funame,$fudom,$fucourseid,$fusymb)=@_;      my ($funame,$fudom,$fucourseid,$fusymb,$part)=@_;
     my $cuname=unpack("%32C*",$funame);      my $cuname=unpack("%32C*",$funame);
     my $cudom=unpack("%32C*",$fudom);      my $cudom=unpack("%32C*",$fudom);
     my $cucourseid=unpack("%32C*",$fucourseid);      my $cucourseid=unpack("%32C*",$fucourseid);
     my $cusymb=unpack("%32C*",$fusymb);      my $cusymb=unpack("%32C*",$fusymb);
     my $cunique=unpack("%32C*",$perlvar{'lonReceipt'});      my $cunique=&recunique($fucourseid);
     return unpack("%32C*",$perlvar{'lonHostID'}).'-'.      my $cpart=unpack("%32S*",$part);
            ($cunique%$cuname+      my $return =&recprefix($fucourseid).'-';
             $cunique%$cudom+      if ($ENV{"course.$fucourseid.receiptalg"} eq 'receipt2' ||
             $cusymb%$cuname+   $ENV{'request.state'} eq 'construct') {
             $cusymb%$cudom+   &Apache::lonxml::debug("doing receipt2  using parts $cpart, uname $cuname and udom $cudom gets  ".($cpart%$cuname).
             $cucourseid%$cuname+         " and ".($cpart%$cudom));
             $cucourseid%$cudom);         
    $return.= ($cunique%$cuname+
      $cunique%$cudom+
      $cusymb%$cuname+
      $cusymb%$cudom+
      $cucourseid%$cuname+
      $cucourseid%$cudom+
      $cpart%$cuname+
      $cpart%$cudom);
       } else {
    $return.= ($cunique%$cuname+
      $cunique%$cudom+
      $cusymb%$cuname+
      $cusymb%$cudom+
      $cucourseid%$cuname+
      $cucourseid%$cudom);
       }
       return $return;
 }  }
   
 sub receipt {  sub receipt {
     return &ireceipt($ENV{'user.name'},$ENV{'user.domain'},      my ($part)=@_;
                      $ENV{'request.course.id'},&symbread());      my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
       return &ireceipt($name,$domain,$courseid,$symb,$part);
 }  }
     
 # ------------------------------------------------------------ Serves up a file  # ------------------------------------------------------------ Serves up a file
 # returns either the contents of the file or a -1  # returns either the contents of the file or 
   # -1 if the file doesn't exist
   #
   # if the target is a file that was uploaded via DOCS, 
   # a check will be made to see if a current copy exists on the local server,
   # if it does this will be served, otherwise a copy will be retrieved from
   # the home server for the course and stored in /home/httpd/html/userfiles on
   # the local server.   
   
 sub getfile {  sub getfile {
   my $file=shift;      my ($file) = @_;
   &repcopy($file);  
   if (! -e $file ) { return -1; };      if ($file =~ m|^/*uploaded/|) { $file=&filelocation("",$file); }
   my $fh=Apache::File->new($file);      &repcopy($file);
   my $a='';      return &readfile($file);
   while (<$fh>) { $a .=$_; }  }
   return $a  
   sub repcopy_userfile {
       my ($file)=@_;
   
       if ($file =~ m|^/*uploaded/|) { $file=&filelocation("",$file); }
       if ($file =~ m|^/home/httpd/html/lonUsers/|) { return OK; }
   
       my ($cdom,$cnum,$filename) = 
    ($file=~m|^\Q$perlvar{'lonDocRoot'}\E/+userfiles/+([^/]+)/+([^/]+)/+(.*)|);
       my ($info,$rtncode);
       my $uri="/uploaded/$cdom/$cnum/$filename";
       if (-e "$file") {
    my @fileinfo = stat($file);
    my $lwpresp = &getuploaded('HEAD',$uri,$cdom,$cnum,\$info,\$rtncode);
    if ($lwpresp ne 'ok') {
       if ($rtncode eq '404') {
    unlink($file);
       }
       #my $ua=new LWP::UserAgent;
       #my $request=new HTTP::Request('GET',&tokenwrapper($uri));
       #my $response=$ua->request($request);
       #if ($response->is_success()) {
    # return $response->content;
    #    } else {
    # return -1;
    #    }
       return -1;
    }
    if ($info < $fileinfo[9]) {
       return OK;
    }
    $info = '';
    $lwpresp = &getuploaded('GET',$uri,$cdom,$cnum,\$info,\$rtncode);
    if ($lwpresp ne 'ok') {
       return -1;
    }
       } else {
    my $lwpresp = &getuploaded('GET',$uri,$cdom,$cnum,\$info,\$rtncode);
    if ($lwpresp ne 'ok') {
       my $ua=new LWP::UserAgent;
       my $request=new HTTP::Request('GET',&tokenwrapper($uri));
       my $response=$ua->request($request);
       if ($response->is_success()) {
    $info=$response->content;
       } else {
    return -1;
       }
    }
    my @parts = ($cdom,$cnum); 
    if ($filename =~ m|^(.+)/[^/]+$|) {
       push @parts, split(/\//,$1);
    }
    my $path = $perlvar{'lonDocRoot'}.'/userfiles';
    foreach my $part (@parts) {
       $path .= '/'.$part;
       if (!-e $path) {
    mkdir($path,0770);
       }
    }
       }
       open(FILE,">$file");
       print FILE $info;
       close(FILE);
       return OK;
   }
   
   sub tokenwrapper {
       my $uri=shift;
       $uri=~s|^http\://([^/]+)||;
       $uri=~s|^/||;
       $ENV{'user.environment'}=~/\/([^\/]+)\.id/;
       my $token=$1;
       my (undef,$udom,$uname,$file)=split('/',$uri,4);
       if ($udom && $uname && $file) {
    $file=~s|(\?\.*)*$||;
           &appenv("userfile.$udom/$uname/$file" => $ENV{'request.course.id'});
           return 'http://'.$hostname{ &homeserver($uname,$udom)}.'/'.$uri.
                  (($uri=~/\?/)?'&':'?').'token='.$token.
                                  '&tokenissued='.$perlvar{'lonHostID'};
       } else {
           return '/adm/notfound.html';
       }
   }
   
   sub getuploaded {
       my ($reqtype,$uri,$cdom,$cnum,$info,$rtncode) = @_;
       $uri=~s/^\///;
       $uri = 'http://'.$hostname{ &homeserver($cnum,$cdom)}.'/raw/'.$uri;
       my $ua=new LWP::UserAgent;
       my $request=new HTTP::Request($reqtype,$uri);
       my $response=$ua->request($request);
       $$rtncode = $response->code;
       if (! $response->is_success()) {
    return 'failed';
       }      
       if ($reqtype eq 'HEAD') {
    $$info = &HTTP::Date::str2time( $response->header('Last-modified') );
       } elsif ($reqtype eq 'GET') {
    $$info = $response->content;
       }
       return 'ok';
   }
   
   sub readfile {
       my $file = shift;
       if ( (! -e $file ) || ($file eq '') ) { return -1; };
       my $fh;
       open($fh,"<$file");
       my $a='';
       while (<$fh>) { $a .=$_; }
       return $a;
 }  }
   
 sub filelocation {  sub filelocation {
Line 2513  sub filelocation { Line 5258  sub filelocation {
   if ($file=~m:^/~:) { # is a contruction space reference    if ($file=~m:^/~:) { # is a contruction space reference
     $location = $file;      $location = $file;
     $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;      $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
     } elsif ($file=~/^\/*uploaded/) { # is an uploaded file
         my ($udom,$uname,$filename)=
     ($file=~m|^/+uploaded/+([^/]+)/+([^/]+)/+(.*)$|);
         my $home=&homeserver($uname,$udom);
         my $is_me=0;
         my @ids=&current_machine_ids();
         foreach my $id (@ids) { if ($id eq $home) { $is_me=1; } }
         if ($is_me) {
     $location=&Apache::loncommon::propath($udom,$uname).
         '/userfiles/'.$filename;
         } else {
     $location=$Apache::lonnet::perlvar{'lonDocRoot'}.'/userfiles/'.
         $udom.'/'.$uname.'/'.$filename;
         }
   } else {    } else {
     $file=~s/^$perlvar{'lonDocRoot'}//;      $file=~s/^\Q$perlvar{'lonDocRoot'}\E//;
     $file=~s:^/*res::;      $file=~s:^/res/:/:;
     if ( !( $file =~ m:^/:) ) {      if ( !( $file =~ m:^/:) ) {
       $location = $dir. '/'.$file;        $location = $dir. '/'.$file;
     } else {      } else {
Line 2524  sub filelocation { Line 5283  sub filelocation {
   }    }
   $location=~s://+:/:g; # remove duplicate /    $location=~s://+:/:g; # remove duplicate /
   while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..    while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
     while ($location=~m:/\./:) {$location=~ s:/\./:/:g;} #remove /./
   return $location;    return $location;
 }  }
   
 sub hreflocation {  sub hreflocation {
     my ($dir,$file)=@_;      my ($dir,$file)=@_;
     unless (($file=~/^http:\/\//i) || ($file=~/^\//)) {      unless (($file=~m-^http://-i) || ($file=~m-^/-)) {
        my $finalpath=filelocation($dir,$file);   my $finalpath=filelocation($dir,$file);
        $finalpath=~s/^\/home\/httpd\/html//;   $finalpath=~s-^/home/httpd/html--;
        return $finalpath;   $finalpath=~s-^/home/(\w+)/public_html/-/~$1/-;
     } else {   return $finalpath;
        return $file;      } elsif ($file=~m-^/home-) {
    $file=~s-^/home/httpd/html--;
    $file=~s-^/home/(\w+)/public_html/-/~$1/-;
    return $file;
       }
       return $file;
   }
   
   sub current_machine_domains {
       my $hostname=$hostname{$perlvar{'lonHostID'}};
       my @domains;
       while( my($id, $name) = each(%hostname)) {
   # &logthis("-$id-$name-$hostname-");
    if ($hostname eq $name) {
       push(@domains,$hostdom{$id});
    }
     }      }
       return @domains;
   }
   
   sub current_machine_ids {
       my $hostname=$hostname{$perlvar{'lonHostID'}};
       my @ids;
       while( my($id, $name) = each(%hostname)) {
   # &logthis("-$id-$name-$hostname-");
    if ($hostname eq $name) {
       push(@ids,$id);
    }
       }
       return @ids;
 }  }
   
 # ------------------------------------------------------------- Declutters URLs  # ------------------------------------------------------------- Declutters URLs
   
 sub declutter {  sub declutter {
     my $thisfn=shift;      my $thisfn=shift;
     $thisfn=~s/^$perlvar{'lonDocRoot'}//;      $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
     $thisfn=~s/^\///;      $thisfn=~s/^\///;
     $thisfn=~s/^res\///;      $thisfn=~s/^res\///;
       $thisfn=~s/\?.+$//;
       return $thisfn;
   }
   
   # ------------------------------------------------------------- Clutter up URLs
   
   sub clutter {
       my $thisfn='/'.&declutter(shift);
       unless ($thisfn=~/^\/(uploaded|adm|userfiles|ext|raw|priv|public)\//) { 
          $thisfn='/res'.$thisfn; 
       }
     return $thisfn;      return $thisfn;
 }  }
   
   sub freeze_escape {
       my ($value)=@_;
       if (ref($value)) {
    $value=&nfreeze($value);
    return '__FROZEN__'.&escape($value);
       }
       return &escape($value);
   }
   
 # -------------------------------------------------------- Escape Special Chars  # -------------------------------------------------------- Escape Special Chars
   
 sub escape {  sub escape {
Line 2564  sub unescape { Line 5372  sub unescape {
     return $str;      return $str;
 }  }
   
   sub thaw_unescape {
       my ($value)=@_;
       if ($value =~ /^__FROZEN__/) {
    substr($value,0,10,undef);
    $value=&unescape($value);
    return &thaw($value);
       }
       return &unescape($value);
   }
   
   sub mod_perl_version {
       if (defined($perlvar{'MODPERL2'})) {
    return 2;
       }
       return 1;
   }
   
   sub correct_line_ends {
       my ($result)=@_;
       $$result =~s/\r\n/\n/mg;
       $$result =~s/\r/\n/mg;
   }
 # ================================================================ Main Program  # ================================================================ Main Program
   
 sub goodbye {  sub goodbye {
      &logthis("Starting Shut down");
   #not converted to using infrastruture and probably shouldn't be
      &logthis(sprintf("%-20s is %s",'%badServerCache',scalar(%badServerCache)));
   #converted
      &logthis(sprintf("%-20s is %s",'%metacache',scalar(%metacache)));
      &logthis(sprintf("%-20s is %s",'%homecache',scalar(%homecache)));
      &logthis(sprintf("%-20s is %s",'%titlecache',scalar(%titlecache)));
      &logthis(sprintf("%-20s is %s",'%courseresdatacache',scalar(%courseresdatacache)));
   #1.1 only
      &logthis(sprintf("%-20s is %s",'%userresdatacache',scalar(%userresdatacache)));
      &logthis(sprintf("%-20s is %s",'%getsectioncache',scalar(%getsectioncache)));
      &logthis(sprintf("%-20s is %s",'%courseresversioncache',scalar(%courseresversioncache)));
      &logthis(sprintf("%-20s is %s",'%resversioncache',scalar(%resversioncache)));
    &flushcourselogs();     &flushcourselogs();
    &logthis("Shutting down");     &logthis("Shutting down");
      return DONE;
 }  }
   
 BEGIN {  BEGIN {
 # ------------------------------------------------------------ Read access.conf  # ----------------------------------- Read loncapa.conf and loncapa_apache.conf
     unless ($readit) {      unless ($readit) {
 {  {
     my $config=Apache::File->new("/etc/httpd/conf/access.conf");      open(my $config,"</etc/httpd/conf/loncapa.conf");
   
     while (my $configline=<$config>) {      while (my $configline=<$config>) {
         if ($configline =~ /PerlSetVar/) {          if ($configline=~/\S/ && $configline =~ /^[^\#]*PerlSetVar/) {
    my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);     my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
            chomp($varvalue);             chomp($varvalue);
            $perlvar{$varname}=$varvalue;             $perlvar{$varname}=$varvalue;
         }          }
     }      }
       close($config);
 }  }
   {
       open(my $config,"</etc/httpd/conf/loncapa_apache.conf");
   
       while (my $configline=<$config>) {
           if ($configline =~ /^[^\#]*PerlSetVar/) {
      my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
              chomp($varvalue);
              $perlvar{$varname}=$varvalue;
           }
       }
       close($config);
   }
   
   # ------------------------------------------------------------ Read domain file
   {
       %domaindescription = ();
       %domain_auth_def = ();
       %domain_auth_arg_def = ();
       my $fh;
       if (open($fh,"<".$Apache::lonnet::perlvar{'lonTabDir'}.'/domain.tab')) {
          while (<$fh>) {
              next if (/^(\#|\s*$)/);
   #           next if /^\#/;
              chomp;
              my ($domain, $domain_description, $def_auth, $def_auth_arg,
          $def_lang, $city, $longi, $lati) = split(/:/,$_);
      $domain_auth_def{$domain}=$def_auth;
              $domain_auth_arg_def{$domain}=$def_auth_arg;
      $domaindescription{$domain}=$domain_description;
      $domain_lang_def{$domain}=$def_lang;
      $domain_city{$domain}=$city;
      $domain_longi{$domain}=$longi;
      $domain_lati{$domain}=$lati;
   
    #         &logthis("Domain.tab: $domain, $domain_auth_def{$domain}, $domain_auth_arg_def{$domain},$domaindescription{$domain}");
   #          &logthis("Domain.tab: $domain ".$domaindescription{$domain} );
    }
       }
       close ($fh);
   }
   
   
 # ------------------------------------------------------------- Read hosts file  # ------------------------------------------------------------- Read hosts file
 {  {
     my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");      open(my $config,"<$perlvar{'lonTabDir'}/hosts.tab");
   
     while (my $configline=<$config>) {      while (my $configline=<$config>) {
          next if ($configline =~ /^(\#|\s*$)/);
        chomp($configline);         chomp($configline);
        my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);         my ($id,$domain,$role,$name,$ip,$domdescr)=split(/:/,$configline);
        $hostname{$id}=$name;         if ($id && $domain && $role && $name && $ip) {
        $hostdom{$id}=$domain;   $hostname{$id}=$name;
        $hostip{$id}=$ip;   $hostdom{$id}=$domain;
        if ($role eq 'library') { $libserv{$id}=$name; }   $hostip{$id}=$ip;
    $iphost{$ip}=$id;
    if ($role eq 'library') { $libserv{$id}=$name; }
          }
     }      }
       close($config);
 }  }
   
 # ------------------------------------------------------ Read spare server file  # ------------------------------------------------------ Read spare server file
 {  {
     my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");      open(my $config,"<$perlvar{'lonTabDir'}/spare.tab");
   
     while (my $configline=<$config>) {      while (my $configline=<$config>) {
        chomp($configline);         chomp($configline);
        if (($configline) && ($configline ne $perlvar{'lonHostID'})) {         if ($configline) {
           $spareid{$configline}=1;            $spareid{$configline}=1;
        }         }
     }      }
       close($config);
 }  }
 # ------------------------------------------------------------ Read permissions  # ------------------------------------------------------------ Read permissions
 {  {
     my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");      open(my $config,"<$perlvar{'lonTabDir'}/roles.tab");
   
     while (my $configline=<$config>) {      while (my $configline=<$config>) {
        chomp($configline);   chomp($configline);
       if ($configline) {   if ($configline) {
        my ($role,$perm)=split(/ /,$configline);      my ($role,$perm)=split(/ /,$configline);
        if ($perm ne '') { $pr{$role}=$perm; }      if ($perm ne '') { $pr{$role}=$perm; }
       }   }
     }      }
       close($config);
 }  }
   
 # -------------------------------------------- Read plain texts for permissions  # -------------------------------------------- Read plain texts for permissions
 {  {
     my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");      open(my $config,"<$perlvar{'lonTabDir'}/rolesplain.tab");
   
     while (my $configline=<$config>) {      while (my $configline=<$config>) {
        chomp($configline);   chomp($configline);
       if ($configline) {   if ($configline) {
        my ($short,$plain)=split(/:/,$configline);      my ($short,$plain)=split(/:/,$configline);
        if ($plain ne '') { $prp{$short}=$plain; }      if ($plain ne '') { $prp{$short}=$plain; }
       }   }
     }      }
       close($config);
 }  }
   
 # ---------------------------------------------------------- Read package table  # ---------------------------------------------------------- Read package table
 {  {
     my $config=Apache::File->new("$perlvar{'lonTabDir'}/packages.tab");      open(my $config,"<$perlvar{'lonTabDir'}/packages.tab");
   
     while (my $configline=<$config>) {      while (my $configline=<$config>) {
        chomp($configline);   if ($configline !~ /\S/ || $configline=~/^#/) { next; }
        my ($short,$plain)=split(/:/,$configline);   chomp($configline);
        my ($pack,$name)=split(/\&/,$short);   my ($short,$plain)=split(/:/,$configline);
        if ($plain ne '') {   my ($pack,$name)=split(/\&/,$short);
           $packagetab{$pack.'&'.$name.'&name'}=$name;    if ($plain ne '') {
           $packagetab{$short}=$plain;       $packagetab{$pack.'&'.$name.'&name'}=$name; 
        }      $packagetab{$short}=$plain; 
    }
     }      }
       close($config);
   }
   
   # ------------- set up temporary directory
   {
       $tmpdir = $perlvar{'lonDaemons'}.'/tmp/';
   
 }  }
   
 %metacache=();  %metacache=();
   
 $processmarker=$$.'_'.time.'_'.$perlvar{'lonHostID'};  $processmarker='_'.time.'_'.$perlvar{'lonHostID'};
 $dumpcount=0;  $dumpcount=0;
   
 &logtouch();  &logtouch();
 &logthis('<font color=yellow>INFO: Read configuration</font>');  &logthis('<font color=yellow>INFO: Read configuration</font>');
 $readit=1;  $readit=1;
       {
    use integer;
    my $test=(2**32)+1;
    if ($test != 0) { $_64bit=1; }
    &logthis(" Detected 64bit platform ($_64bit)");
       }
 }  }
 }  }
   
 1;  1;
 __END__  __END__
   
   =pod
   
 =head1 NAME  =head1 NAME
   
 Apache::lonnet - TCP networking package  Apache::lonnet - Subroutines to ask questions about things in the network.
   
 =head1 SYNOPSIS  =head1 SYNOPSIS
   
 Invoked by other LON-CAPA modules.  Invoked by other LON-CAPA modules, when they need to talk to or about objects in the network.
   
  &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);   &Apache::lonnet::SUBROUTINENAME(ARGUMENTS);
   
 =head1 INTRODUCTION  Common parameters:
   
 This module provides subroutines which interact with the  =over 4
 lonc/lond (TCP) network layer of LON-CAPA.  
   
 This is part of the LearningOnline Network with CAPA project  =item *
 described at http://www.lon-capa.org.  
   
 =head1 HANDLER SUBROUTINE  $uname : an internal username (if $cname expecting a course Id specifically)
   
 There is no handler routine for this module.  =item *
   
 =head1 OTHER SUBROUTINES  $udom : a domain (if $cdom expecting a course's domain specifically)
   
 =over 4  =item *
   
   $symb : a resource instance identifier
   
 =item *  =item *
   
 logtouch() : make sure the logfile, lonnet.log, exists  $namespace : the name of a .db file that contains the data needed or
   being set.
   
   =back
   
   =head1 OVERVIEW
   
   lonnet provides subroutines which interact with the
   lonc/lond (TCP) network layer of LON-CAPA. They can be used to ask
   about classes, users, and resources.
   
   For many of these objects you can also use this to store data about
   them or modify them in various ways.
   
   =head2 Symbs
   
   To identify a specific instance of a resource, LON-CAPA uses symbols
   or "symbs"X<symb>. These identifiers are built from the URL of the
   map, the resource number of the resource in the map, and the URL of
   the resource itself. The latter is somewhat redundant, but might help
   if maps change.
   
   An example is
   
    msu/korte/parts/part1.sequence___19___msu/korte/tests/part12.problem
   
   The respective map entry is
   
    <resource id="19" src="/res/msu/korte/tests/part12.problem"
     title="Problem 2">
    </resource>
   
   Symbs are used by the random number generator, as well as to store and
   restore data specific to a certain instance of for example a problem.
   
   =head2 Storing And Retrieving Data
   
   X<store()>X<cstore()>X<restore()>Three of the most important functions
   in C<lonnet.pm> are C<&Apache::lonnet::cstore()>,
   C<&Apache::lonnet:restore()>, and C<&Apache::lonnet::store()>, which
   is is the non-critical message twin of cstore. These functions are for
   handlers to store a perl hash to a user's permanent data space in an
   easy manner, and to retrieve it again on another call. It is expected
   that a handler would use this once at the beginning to retrieve data,
   and then again once at the end to send only the new data back.
   
   The data is stored in the user's data directory on the user's
   homeserver under the ID of the course.
   
   The hash that is returned by restore will have all of the previous
   value for all of the elements of the hash.
   
   Example:
   
    #creating a hash
    my %hash;
    $hash{'foo'}='bar';
   
    #storing it
    &Apache::lonnet::cstore(\%hash);
   
    #changing a value
    $hash{'foo'}='notbar';
   
    #adding a new value
    $hash{'bar'}='foo';
    &Apache::lonnet::cstore(\%hash);
   
    #retrieving the hash
    my %history=&Apache::lonnet::restore();
   
    #print the hash
    foreach my $key (sort(keys(%history))) {
      print("\%history{$key} = $history{$key}");
    }
   
   Will print out:
   
    %history{1:foo} = bar
    %history{1:keys} = foo:timestamp
    %history{1:timestamp} = 990455579
    %history{2:bar} = foo
    %history{2:foo} = notbar
    %history{2:keys} = foo:bar:timestamp
    %history{2:timestamp} = 990455580
    %history{bar} = foo
    %history{foo} = notbar
    %history{timestamp} = 990455580
    %history{version} = 2
   
   Note that the special hash entries C<keys>, C<version> and
   C<timestamp> were added to the hash. C<version> will be equal to the
   total number of versions of the data that have been stored. The
   C<timestamp> attribute will be the UNIX time the hash was
   stored. C<keys> is available in every historical section to list which
   keys were added or changed at a specific historical revision of a
   hash.
   
   B<Warning>: do not store the hash that restore returns directly. This
   will cause a mess since it will restore the historical keys as if the
   were new keys. I.E. 1:foo will become 1:1:foo etc.
   
   Calling convention:
   
    my %record=&Apache::lonnet::restore($symb,$courseid,$domain,$uname,$home);
    &Apache::lonnet::cstore(\%newrecord,$symb,$courseid,$domain,$uname,$home);
   
   For more detailed information, see lonnet specific documentation.
   
   =head1 RETURN MESSAGES
   
   =over 4
   
   =item * B<con_lost>: unable to contact remote host
   
   =item * B<con_delayed>: unable to contact remote host, message will be delivered
   when the connection is brought back up
   
   =item * B<con_failed>: unable to contact remote host and unable to save message
   for later delivery
   
   =item * B<error:>: an error a occured, a description of the error follows the :
   
   =item * B<no_such_host>: unable to fund a host associated with the user/domain
   that was requested
   
   =back
   
   =head1 PUBLIC SUBROUTINES
   
   =head2 Session Environment Functions
   
   =over 4
   
   =item * 
   X<appenv()>
   B<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 *  =item *
   X<delenv()>
   B<delenv($regexp)>: removes all items from the session
   environment file that matches the regular expression in $regexp. The
   values are also delted from the current processes %ENV.
   
 logthis() : append message to lonnet.log  =back
   
   =head2 User Information
   
   =over 4
   
 =item *  =item *
   X<queryauthenticate()>
   B<queryauthenticate($uname,$udom)>: try to determine user's current 
   authentication scheme
   
 logperm() : append a permanent message to lonnet.perm.log  =item *
   X<authenticate()>
   B<authenticate($uname,$upass,$udom)>: try to
   authenticate user from domain's lib servers (first use the current
   one). C<$upass> should be the users password.
   
 =item *  =item *
   X<homeserver()>
   B<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.
   
 subreply() : non-critical communication, called by &reply  =item *
   X<idget()>
   B<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 *  =item *
   X<idrget()>
   B<idrget($udom,@unames)>: find the IDs behind a list of
   usernames (returns hash: name=>id,name=>id)
   
 reply() : makes two attempts to pass message; logs refusals and rejections  =item *
   X<idput()>
   B<idput($udom,%ids)>: store away a list of names and associated IDs
   
 =item *  =item *
   X<rolesinit()>
   B<rolesinit($udom,$username,$authhost)>: get user privileges
   
 reconlonc() : tries to reconnect lonc client processes.  =item *
   X<getsection()>
   B<getsection($udom,$uname,$cname)>: finds the section of student in the
   course $cname, return section name/number or '' for "not in course"
   and '-1' for "no section"
   
 =item *  =item *
   X<userenvironment()>
   B<userenvironment($udom,$uname,@what)>: gets the values of the keys
   passed in @what from the requested user's environment, returns a hash
   
 critical() : passes a critical message to another server; if cannot get  =back
 through then place message in connection buffer  
   =head2 User Roles
   
   =over 4
   
 =item *  =item *
   
 appenv(%hash) : read in current user environment, append new environment  allowed($priv,$uri) : check for a user privilege; returns codes for allowed
 values to make new user environment  actions
    F: full access
    U,I,K: authentication modes (cxx only)
    '': forbidden
    1: user needs to choose course
    2: browse allowed
   
 =item *  =item *
   
 delenv($varname) : read in current user environment, remove all values  definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
 beginning with $varname, write new user environment (note: flock is used  role rolename set privileges in format of lonTabs/roles.tab for system, domain,
 to prevent conflicting shared read/writes with file)  and course level
   
 =item *  =item *
   
 spareserver() : find server with least workload from spare.tab  plaintext($short) : return value in %prp hash (rolesplain.tab); plain text
   explanation of a user role term
   
   =back
   
   =head2 User Modification
   
   =over 4
   
 =item *  =item *
   
 queryauthenticate($uname,$udom) : try to determine user's current  assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a
 authentication scheme  user for the level given by URL.  Optional start and end dates (leave empty
   string or zero for "no date")
   
 =item *  =item *
   
 authenticate($uname,$upass,$udom) : try to authenticate user from domain's lib  changepass($uname,$udom,$currentpass,$newpass,$server) : attempts to
 servers (first use the current one)  change a users, password, possible return values are: ok,
   pwchange_failure, non_authorized, auth_mode_error, unknown_user,
   refused
   
 =item *  =item *
   
 homeserver($uname,$udom) : find the homebase for a user from domain's lib  modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication
 servers  
   
 =item *  =item *
   
 idget($udom,@ids) : find the usernames behind a list of IDs (returns hash:  modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) : 
 id=>name,id=>name)  modify user
   
 =item *  =item *
   
 idrget($udom,@unames) : find the IDs behind a list of usernames (returns hash:  modifystudent
 name=>id,name=>id)  
   modify a students enrollment and identification information.
   The course id is resolved based on the current users environment.  
   This means the envoking user must be a course coordinator or otherwise
   associated with a course.
   
   This call is essentially a wrapper for lonnet::modifyuser and
   lonnet::modify_student_enrollment
   
   Inputs: 
   
   =over 4
   
   =item B<$udom> Students loncapa domain
   
   =item B<$uname> Students loncapa login name
   
   =item B<$uid> Students id/student number
   
   =item B<$umode> Students authentication mode
   
   =item B<$upass> Students password
   
   =item B<$first> Students first name
   
   =item B<$middle> Students middle name
   
   =item B<$last> Students last name
   
   =item B<$gene> Students generation
   
   =item B<$usec> Students section in course
   
   =item B<$end> Unix time of the roles expiration
   
   =item B<$start> Unix time of the roles start date
   
   =item B<$forceid> If defined, allow $uid to be changed
   
   =item B<$desiredhome> server to use as home server for student
   
   =back
   
 =item *  =item *
   
 idput($udom,%ids) : store away a list of names and associated IDs  modify_student_enrollment
   
   Change a students enrollment status in a class.  The environment variable
   'role.request.course' must be defined for this function to proceed.
   
   Inputs:
   
   =over 4
   
   =item $udom, students domain
   
   =item $uname, students name
   
   =item $uid, students user id
   
   =item $first, students first name
   
   =item $middle
   
   =item $last
   
   =item $gene
   
   =item $usec
   
   =item $end
   
   =item $start
   
   =back
   
   
 =item *  =item *
   
 usection($domain,$user,$courseid) : output of section name/number or '' for  assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign
 "not in course" and '-1' for "no section"  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 *  =item *
   
 userenvironment($domain,$user,$what) : puts out any environment parameter   revokerole($udom,$uname,$url,$role) : revoke a role for url
 for a user  
   
 =item *  =item *
   
 subscribe($fname) : subscribe to a resource, return URL if possible  revokecustomrole($udom,$uname,$url,$role) : revoke a custom role
   
   =back
   
   =head2 Course Infomation
   
   =over 4
   
 =item *  =item *
   
 repcopy($filename) : replicate file  coursedescription($courseid) : course description
   
 =item *  =item *
   
 ssi($url,%hash) : server side include, does a complete request cycle on url to  courseresdata($coursenum,$coursedomain,@which) : request for current
 localhost, posts hash  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 *  =item *
   
 log($domain,$name,$home,$message) : write to permanent log for user; use  writecoursepref($courseid,%prefs) : write preferences (environment
 critical subroutine  database) for a course
   
 =item *  =item *
   
 flushcourselogs() : flush (save) buffer logs and access logs  createcourse($udom,$description,$url) : make/modify course
   
   =back
   
   =head2 Resource Subroutines
   
   =over 4
   
 =item *  =item *
   
 courselog($what) : save message for course in hash  subscribe($fname) : subscribe to a resource, returns URL if possible (probably should use repcopy instead)
   
 =item *  =item *
   
 courseacclog($what) : save message for course using &courselog().  Perform  repcopy($filename) : subscribes to the requested file, and attempts to
 special processing for specific resource types (problems, exams, quizzes, etc).  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 *  =item *
   
 countacc($url) : count the number of accesses to a given URL  EXT($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 *  =item *
   
 sub checkout($symb,$tuname,$tudom,$tcrsid) : check out an item  directcondval($number) : get current value of a condition; reads from a state
   string
   
 =item *  =item *
   
 sub checkin($token) : check in an item  condval($condidx) : value of condition index based on state
   
 =item *  =item *
   
 sub expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet  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 *  =item *
   
 devalidate($symb) : devalidate spreadsheets  metadata_query($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 *  =item *
   
 hash2str(%hash) : convert a hash into a string complete with escaping and '='  symbread($filename) : return symbolic list entry (filename argument optional);
 and '&' separators  returns the data handle
   
 =item *  =item *
   
 str2hash($string) : convert string to hash using unescaping and splitting on  symbverify($symb,$thisfn) : verifies that $symb actually exists and is
 '=' and '&'  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 *  =item *
   
 tmpreset($symb,$namespace,$domain,$stuname) : temporary storage  symbclean($symb) : removes versions numbers from a symb, returns the
   cleaned symb
   
 =item *  =item *
   
 tmprestore($symb,$namespace,$domain,$stuname) : temporary restore  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 *  =item *
   
 store($storehash,$symb,$namespace,$domain,$stuname) : stores hash permanently  numval($salt) : return random seed value (addend for rndseed)
 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 *  =item *
   
 cstore($storehash,$symb,$namespace,$domain,$stuname) : same as store but  rndseed($symb,$courseid,$udom,$uname) : create a random sum; returns
 uses critical subroutine  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 *  =item *
   
 restore($symb,$namespace,$domain,$stuname) : returns hash for this symb;  ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,
 all args are optional  unfakeable, receipt
   
 =item *  =item *
   
 coursedescription($courseid) : course description  receipt() : API to ireceipt working off of ENV values; given out to users
   
 =item *  =item *
   
 rolesinit($domain,$username,$authhost) : get user privileges  countacc($url) : count the number of accesses to a given URL
   
 =item *  =item *
   
 get($namespace,$storearr,$udomain,$uname) : returns hash with keys from array  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
 reference filled in from namesp ($udomain and $uname are optional)  
   
 =item *  =item *
   
 del($namespace,$storearr,$udomain,$uname) : deletes keys out of array from  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 $tcrsid)
 namesp ($udomain and $uname are optional)  
   
 =item *  =item *
   
 dump($namespace,$udomain,$uname,$regexp) :   expirespread($uname,$udom,$stype,$usymb) : set expire date for spreadsheet
 dumps the complete (or key matching regexp) namespace into a hash  
 ($udomain, $uname and $regexp are optional)  
   
 =item *  =item *
   
 put($namespace,$storehash,$udomain,$uname) : stores hash in namesp  devalidate($symb) : devalidate temporary spreadsheet calculations,
 ($udomain and $uname are optional)  forcing spreadsheet to reevaluate the resource scores next time.
   
   =back
   
   =head2 Storing/Retreiving Data
   
   =over 4
   
 =item *  =item *
   
 cput($namespace,$storehash,$udomain,$uname) : critical put  store($storehash,$symb,$namespace,$udom,$uname) : stores hash permanently
 ($udomain and $uname are optional)  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 *  =item *
   
 eget($namespace,$storearr,$udomain,$uname) : returns hash with keys from array  cstore($storehash,$symb,$namespace,$udom,$uname) : same as store but
 reference filled in from namesp (encrypts the return communication)  uses critical subroutine
 ($udomain and $uname are optional)  
   
 =item *  =item *
   
 allowed($priv,$uri) : check for a user privilege; returns codes for allowed  restore($symb,$namespace,$udom,$uname) : returns hash for this symb;
 actions  all args are optional
  F: full access  
  U,I,K: authentication modes (cxx only)  
  '': forbidden  
  1: user needs to choose course  
  2: browse allowed  
   
 =item *  =item *
   
 definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom  tmpstore($storehash,$symb,$namespace,$udom,$uname) : storage that
 role rolename set privileges in format of lonTabs/roles.tab for system, domain,  works very similar to store/cstore, but all data is stored in a
 and course level  temporary location and can be reset using tmpreset, $storehash should
   be a hash reference, returns nothing on success
   
 =item *  =item *
   
 metadata_query($query,$custom,$customshow) : make a metadata query against the  tmprestore($symb,$namespace,$udom,$uname) : storage that works very
 network of library servers; returns file handle of where SQL and regex results  similar to restore, but all data is stored in a temporary location and
 will be stored for query  can be reset using tmpreset. Returns a hash of values on success,
   error string otherwise.
   
 =item *  =item *
   
 plaintext($short) : return value in %prp hash (rolesplain.tab); plain text  tmpreset($symb,$namespace,$udom,$uname) : temporary storage reset,
 explanation of a user role term  deltes all keys for $symb form the temporary storage hash.
   
 =item *  =item *
   
 assignrole($udom,$uname,$url,$role,$end,$start) : assign role; give a role to a  get($namespace,$storearr,$udom,$uname) : returns hash with keys from array
 user for the level given by URL.  Optional start and end dates (leave empty  reference filled in from namesp ($udom and $uname are optional)
 string or zero for "no date")  
   
 =item *  =item *
   
 modifyuserauth($udom,$uname,$umode,$upass) : modify user authentication  del($namespace,$storearr,$udom,$uname) : deletes keys out of array from
   namesp ($udom and $uname are optional)
   
 =item *  =item *
   
 modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene) :   dump($namespace,$udom,$uname,$regexp) : 
 modify user  dumps the complete (or key matching regexp) namespace into a hash
   ($udom, $uname and $regexp are optional)
   
 =item *  =item *
   
 modifystudent($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,$usec,  inc($namespace,$store,$udom,$uname) : increments $store in $namespace.
 $end,$start) : modify student  $store can be a scalar, an array reference, or if the amount to be 
   incremented is > 1, a hash reference.
   
   ($udom and $uname are optional)
   
 =item *  =item *
   
 writecoursepref($courseid,%prefs) : write preferences for a course  put($namespace,$storehash,$udom,$uname) : stores hash in namesp
   ($udom and $uname are optional)
   
 =item *  =item *
   
 createcourse($udom,$description,$url) : make/modify course  putstore($namespace,$storehash,$udomain,$uname) : stores hash in namesp
   keys used in storehash include version information (e.g., 1:$symb:message etc.) as
   used in records written by &store and retrieved by &restore.  This function 
   was created for use in editing discussion posts, without incrementing the
   version number included in the key for a particular post. The colon 
   separated list of attribute names (e.g., the value associated with the key 
   1:keys:$symb) is also generated and passed in the ampersand separated 
   items sent to lonnet::reply().  
   
 =item *  =item *
   
 assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start) : assign  cput($namespace,$storehash,$udom,$uname) : critical put
 custom role; give a custom role to a user for the level given by URL.  Specify  ($udom and $uname are optional)
 name and domain of role author, and role name  
   
 =item *  =item *
   
 revokerole($udom,$uname,$url,$role) : revoke a role for url  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 *  =item *
   
 revokecustomrole($udom,$uname,$url,$role) : revoke a custom role  log($udom,$name,$home,$message) : write to permanent log for user; use
   critical subroutine
   
   =back
   
   =head2 Network Status Functions
   
   =over 4
   
 =item *  =item *
   
Line 2976  dirlist($uri) : return directory list ba Line 6220  dirlist($uri) : return directory list ba
   
 =item *  =item *
   
 directcondval($number) : get current value of a condition; reads from a state  spareserver() : find server with least workload from spare.tab
 string  
   =back
   
   =head2 Apache Request
   
   =over 4
   
 =item *  =item *
   
 condval($condidx) : value of condition index based on state  ssi($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 *  =item *
   
 EXT($varname,$symbparm) : value of a variable  hash2str(%hash) : convert a hash into a string complete with escaping and '='
   and '&' separators, supports elements that are arrayrefs and hashrefs
   
 =item *  =item *
   
 metadata($uri,$what,$liburi,$prefix,$depthcount) : get metadata; returns the  hashref2str($hashref) : convert a hashref into a string complete with
 metadata entry for a file; entry='keys', returns a comma separated list of keys  escaping and '=' and '&' separators, supports elements that are
   arrayrefs and hashrefs
   
 =item *  =item *
   
 symblist($mapname,%newhash) : update symbolic storage links  arrayref2str($arrayref) : convert an arrayref into a string complete
   with escaping and '&' separators, supports elements that are arrayrefs
   and hashrefs
   
 =item *  =item *
   
 symbread($filename) : return symbolic list entry (filename argument optional);  str2hash($string) : convert string to hash using unescaping and
 returns the data handle  splitting on '=' and '&', supports elements that are arrayrefs and
   hashrefs
   
 =item *  =item *
   
 numval($salt) : return random seed value (addend for rndseed)  str2array($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 *  =item *
   
 rndseed($symb,$courseid,$domain,$username) : create a random sum; returns  logtouch() : make sure the logfile, lonnet.log, exists
 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 *  =item *
   
 ireceipt($funame,$fudom,$fucourseid,$fusymb) : return unique,  logthis() : append message to the normal lonnet.log file, it gets
 unfakeable, receipt  preiodically rolled over and deleted.
   
 =item *  =item *
   
 receipt() : API to ireceipt working off of ENV values; given out to users  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 *  =item *
   
 getfile($file) : serves up a file, returns the contents of a file or -1;  getfile($file,$caller) : two cases - requests for files in /res or in /uploaded.
 replicates and subscribes to the file  (a) files in /uploaded
     (i) If a local copy of the file exists - 
         compares modification date of local copy with last-modified date for 
         definitive version stored on home server for course. If local copy is 
         stale, requests a new version from the home server and stores it. 
         If the original has been removed from the home server, then local copy 
         is unlinked.
     (ii) If local copy does not exist -
         requests the file from the home server and stores it. 
     
     If $caller is 'uploadrep':  
       This indicates a call from lonuploadrep.pm (PerlHeaderParserHandler phase)
       for request for files originally uploaded via DOCS. 
        - returns 'ok' if fresh local copy now available, -1 otherwise.
     
     Otherwise:
        This indicates a call from the content generation phase of the request.
        -  returns the entire contents of the file or -1.
        
   (b) files in /res
      - returns the entire contents of a file or -1; 
      it properly subscribes to and replicates the file if neccessary.
   
 =item *  =item *
   
 filelocation($dir,$file) : returns file system location of a file based on URI;  filelocation($dir,$file) : returns file system location of a file
 meant to be "fairly clean" absolute reference  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 *  =item *
   
Line 3040  filelocation except for hrefs Line 6339  filelocation except for hrefs
   
 declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)  declutter() : declutters URLs (remove docroot, beginning slashes, 'res' etc)
   
   =back
   
   =head2 HTTP Helper Routines
   
   =over 4
   
 =item *  =item *
   
 escape() : unpack non-word characters into CGI-compatible hex codes  escape() : unpack non-word characters into CGI-compatible hex codes
Line 3048  escape() : unpack non-word characters in Line 6353  escape() : unpack non-word characters in
   
 unescape() : pack CGI-compatible hex codes into actual non-word ASCII character  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 *  =item *
   
 goodbye() : flush course logs and log shutting down; it is called in srm.conf  goodbye() : flush course logs and log shutting down; it is called in srm.conf
Line 3055  as a PerlChildExitHandler Line 6406  as a PerlChildExitHandler
   
 =back  =back
   
   =head2 Other
   
   =over 4
   
   =item *
   
   symblist($mapname,%newhash) : update symbolic storage links
   
   =back
   
 =cut  =cut
Removed from v.1.198  
changed lines
  Added in v.1.567

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