--- loncom/lonnet/perl/lonnet.pm	2010/10/05 12:53:30	1.1056.2.8
+++ loncom/lonnet/perl/lonnet.pm	2010/07/06 18:36:56	1.1072
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1056.2.8 2010/10/05 12:53:30 raeburn Exp $
+# $Id: lonnet.pm,v 1.1072 2010/07/06 18:36:56 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -665,30 +665,6 @@ sub userload {
     return $userloadpercent;
 }
 
-# ------------------------------------------ Fight off request when overloaded
-
-sub overloaderror {
-    my ($r,$checkserver)=@_;
-    unless ($checkserver) { $checkserver=$perlvar{'lonHostID'}; }
-    my $loadavg;
-    if ($checkserver eq $perlvar{'lonHostID'}) {
-       open(my $loadfile,'/proc/loadavg');
-       $loadavg=<$loadfile>;
-       $loadavg =~ s/\s.*//g;
-       $loadavg = 100*$loadavg/$perlvar{'lonLoadLim'};
-       close($loadfile);
-    } else {
-       $loadavg=&reply('load',$checkserver);
-    }
-    my $overload=$loadavg-100;
-    if ($overload>0) {
-	$r->err_headers_out->{'Retry-After'}=$overload;
-        $r->log_error('Overload of '.$overload.' on '.$checkserver);
-        return 413;
-    }    
-    return '';
-}
-
 # ------------------------------ Find server with least workload from spare.tab
 
 sub spareserver {
@@ -734,7 +710,7 @@ sub compare_server_load {
     my $userloadans = &reply('userload',$try_server);
 
     if ($loadans !~ /\d/ && $userloadans !~ /\d/) {
-	next; #didn't get a number from the server
+	return; #didn't get a number from the server
     }
 
     my $load;
@@ -3208,7 +3184,7 @@ sub get_domain_roles {
     return %personnel;
 }
 
-# ----------------------------------------------------------- Check out an item
+# ----------------------------------------------------------- Interval timing 
 
 sub get_first_access {
     my ($type,$argsymb)=@_;
@@ -3244,91 +3220,6 @@ sub set_first_access {
     return 'already_set';
 }
 
-sub checkout {
-    my ($symb,$tuname,$tudom,$tcrsid)=@_;
-    my $now=time;
-    my $lonhost=$perlvar{'lonHostID'};
-    my $infostr=&escape(
-                 'CHECKOUTTOKEN&'.
-                 $tuname.'&'.
-                 $tudom.'&'.
-                 $tcrsid.'&'.
-                 $symb.'&'.
-		 $now.'&'.$ENV{'REMOTE_ADDR'});
-    my $token=&reply('tmpput:'.$infostr,$lonhost);
-    if ($token=~/^error\:/) { 
-        &logthis("<font color=\"blue\">WARNING: ".
-                "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
-                 "</font>");
-        return ''; 
-    }
-
-    $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
-    $token=~tr/a-z/A-Z/;
-
-    my %infohash=('resource.0.outtoken' => $token,
-                  'resource.0.checkouttime' => $now,
-                  'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
-
-    unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
-       return '';
-    } else {
-        &logthis("<font color=\"blue\">WARNING: ".
-                "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
-                 "</font>");
-    }    
-
-    if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
-                         &escape('Checkout '.$infostr.' - '.
-                                                 $token)) ne 'ok') {
-	return '';
-    } else {
-        &logthis("<font color=\"blue\">WARNING: ".
-                "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
-                 "</font>");
-    }
-    return $token;
-}
-
-# ------------------------------------------------------------ Check in an item
-
-sub checkin {
-    my $token=shift;
-    my $now=time;
-    my ($ta,$tb,$lonhost)=split(/\*/,$token);
-    $lonhost=~tr/A-Z/a-z/;
-    my $dtoken=$ta.'_'.&hostname($lonhost).'_'.$tb;
-    $dtoken=~s/\W/\_/g;
-    my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
-                 split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
-
-    unless (($tuname) && ($tudom)) {
-        &logthis('Check in '.$token.' ('.$dtoken.') failed');
-        return '';
-    }
-    
-    unless (&allowed('mgr',$tcrsid)) {
-        &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
-                 $env{'user.name'}.' - '.$env{'user.domain'});
-        return '';
-    }
-
-    my %infohash=('resource.0.intoken' => $token,
-                  'resource.0.checkintime' => $now,
-                  'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
-
-    unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
-       return '';
-    }    
-
-    if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
-                         &escape('Checkin - '.$token)) ne 'ok') {
-	return '';
-    }
-
-    return ($symb,$tuname,$tudom,$tcrsid);    
-}
-
 # --------------------------------------------- Set Expire Date for Spreadsheet
 
 sub expirespread {
@@ -4034,7 +3925,7 @@ sub set_userprivs {
     my $adv=0;
     my %grouproles = ();
     if (keys(%{$allgroups}) > 0) {
-        my @groupkeys;
+        my @groupkeys; 
         foreach my $role (keys(%{$allroles})) {
             push(@groupkeys,$role);
         }
@@ -4057,7 +3948,7 @@ sub set_userprivs {
                         foreach my $group (keys(%{$$allgroups{$area}})) {
                             my $spec = $trole.'.'.$extendedarea;
                             $grouproles{$spec.'.'.$area.'/'.$group} = 
-                                                  $$allgroups{$area}{$group};
+                                                $$allgroups{$area}{$group};
                         }
                     }
                 }
@@ -4110,7 +4001,7 @@ sub role_status {
                             my %userroles = (
                                 'user.role.'.$$role.'.'.$$where => $$tstart.'.'.$$tend
                             );
-                            @rolecodes = ('cm');
+                            @rolecodes = ('cm'); 
                             my $spec=$$role.'.'.$$where;
                             my ($tdummy,$tdomain,$trest)=split(/\//,$$where);
                             if ($$role =~ /^cr\//) {
@@ -4127,7 +4018,7 @@ sub role_status {
                                 my %course_roles = &get_my_roles($env{'user.name'},$env{'user.domain'},'userroles',['active'],['cc','co','in','ta','ep','ad','st','cr'],[$tdomain],1);
                                 if (keys(%course_roles) > 0) {
                                     my ($tnum) = ($trest =~ /^($match_courseid)/);
-                                    if ($tdomain ne '' && $tnum ne '') {
+                                    if ($tdomain ne '' && $tnum ne '') { 
                                         foreach my $key (keys(%course_roles)) {
                                             if ($key =~ /^\Q$tnum\E:\Q$tdomain\E:([^:]+):?([^:]*)/) {
                                                 my $crsrole = $1;
@@ -4175,22 +4066,22 @@ sub role_status {
 }
 
 sub check_adhoc_privs {
-    my ($cdom,$cnum,$then,$refresh,$now,$checkrole,$caller) = @_;
+    my ($cdom,$cnum,$then,$refresh,$now,$checkrole) = @_;
     my $cckey = 'user.role.'.$checkrole.'./'.$cdom.'/'.$cnum;
     if ($env{$cckey}) {
         my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus,$tpstart,$tpend);
         &role_status($cckey,$then,$refresh,$now,\$role,\$where,\$trolecode,\$tstatus,\$tstart,\$tend);
         unless (($tstatus eq 'is') || ($tstatus eq 'will_not')) {
-            &set_adhoc_privileges($cdom,$cnum,$checkrole,$caller);
+            &set_adhoc_privileges($cdom,$cnum,$checkrole);
         }
     } else {
-        &set_adhoc_privileges($cdom,$cnum,$checkrole,$caller);
+        &set_adhoc_privileges($cdom,$cnum,$checkrole);
     }
 }
 
 sub set_adhoc_privileges {
 # role can be cc or ca
-    my ($dcdom,$pickedcourse,$role,$caller) = @_;
+    my ($dcdom,$pickedcourse,$role) = @_;
     my $area = '/'.$dcdom.'/'.$pickedcourse;
     my $spec = $role.'.'.$area;
     my %userroles = &set_arearole($role,$area,'','',$env{'user.domain'},
@@ -4200,16 +4091,14 @@ sub set_adhoc_privileges {
     my ($author,$adv)= &set_userprivs(\%userroles,\%ccrole);
     &appenv(\%userroles,[$role,'cm']);
     &log($env{'user.domain'},$env{'user.name'},$env{'user.home'},"Role ".$role);
-    unless ($caller eq 'constructaccess' && $env{'request.course.id'}) {
-        &appenv( {'request.role'        => $spec,
-                  'request.role.domain' => $dcdom,
-                  'request.course.sec'  => ''
-                 }
-               );
-        my $tadv=0;
-        if (&allowed('adv') eq 'F') { $tadv=1; }
-        &appenv({'request.role.adv'    => $tadv});
-    }
+    &appenv( {'request.role'        => $spec,
+              'request.role.domain' => $dcdom,
+              'request.course.sec'  => ''
+             }
+           );
+    my $tadv=0;
+    if (&allowed('adv') eq 'F') { $tadv=1; }
+    &appenv({'request.role.adv'    => $tadv});
 }
 
 # --------------------------------------------------------------- get interface
@@ -5665,7 +5554,8 @@ sub update_allusers_table {
                'generation='.&escape($names->{'generation'}).'%%'.
                'permanentemail='.&escape($names->{'permanentemail'}).'%%'.
                'id='.&escape($names->{'id'}),$homeserver);
-    return;
+    my $reply = &get_query_reply($queryid);
+    return $reply;
 }
 
 # ------- Request retrieval of institutional classlists for course(s)
@@ -6588,10 +6478,6 @@ sub modifyuser {
              ' by '.$env{'user.name'}.' at '.$env{'user.domain'}.
              ' in domain '.$env{'request.role.domain'});
     my $uhome=&homeserver($uname,$udom,'true');
-    my $newuser;
-    if ($uhome eq 'no_host') {
-        $newuser = 1;
-    }
 # ----------------------------------------------------------------- Create User
     if (($uhome eq 'no_host') && 
 	(($umode && $upass) || ($umode eq 'localauth'))) {
@@ -6644,18 +6530,18 @@ sub modifyuser {
 		   ['firstname','middlename','lastname','generation','id',
                     'permanentemail','inststatus'],
 		   $udom,$uname);
-    my (%names,%oldnames);
+    my %names;
     if ($tmp[0] =~ m/^error:.*/) { 
         %names=(); 
     } else {
         %names = @tmp;
-        %oldnames = %names;
     }
 #
 # If name, email and/or uid are blank (e.g., because an uploaded file
 # of users did not contain them), do not overwrite existing values
-# unless field is in $candelete array ref.
+# unless field is in $candelete array ref.  
 #
+
     my @fields = ('firstname','middlename','lastname','generation',
                   'permanentemail','id');
     my %newvalues;
@@ -6668,7 +6554,7 @@ sub modifyuser {
                     $names{$field} = $middle;
                 } elsif ($field eq 'lastname') {
                     $names{$field} = $last;
-                } elsif ($field eq 'generation') {
+                } elsif ($field eq 'generation') { 
                     $names{$field} = $gene;
                 } elsif ($field eq 'permanentemail') {
                     $names{$field} = $email;
@@ -6678,7 +6564,6 @@ sub modifyuser {
             }
         }
     }
-
     if ($first)  { $names{'firstname'}  = $first; }
     if (defined($middle)) { $names{'middlename'} = $middle; }
     if ($last)   { $names{'lastname'}   = $last; }
@@ -6703,7 +6588,11 @@ sub modifyuser {
             }
         }
     }
-    my $logmsg = $udom.', '.$uname.', '.$uid.', '.
+    my $reply = &put('environment', \%names, $udom,$uname);
+    if ($reply ne 'ok') { return 'error: '.$reply; }
+    my $sqlresult = &update_allusers_table($uname,$udom,\%names);
+    &devalidate_cache_new('namescache',$uname.':'.$udom);
+    my $logmsg = 'Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
                  $umode.', '.$first.', '.$middle.', '.
 	         $last.', '.$gene.', '.$email.', '.$inststatus;
     if ($env{'user.name'} ne '' && $env{'user.domain'}) {
@@ -6711,32 +6600,6 @@ sub modifyuser {
     } else {
         $logmsg .= ' during self creation';
     }
-    my $changed;
-    if ($newuser) {
-        $changed = 1;
-    } else {
-        foreach my $field (@fields) {
-            if ($names{$field} ne $oldnames{$field}) {
-                $changed = 1;
-                last;
-            }
-        }
-    }
-    unless ($changed) {
-        $logmsg = 'No changes in user information needed for: '.$logmsg;
-        &logthis($logmsg);
-        return 'ok';
-    }
-    my $reply = &put('environment', \%names, $udom,$uname);
-    if ($reply ne 'ok') {
-        return 'error: '.$reply;
-    }
-    if ($names{'permanentemail'} ne $oldnames{'permanentemail'}) {
-        &Apache::lonnet::devalidate_cache_new('emailscache',$uname.':'.$udom);
-    }
-    my $sqlresult = &update_allusers_table($uname,$udom,\%names);
-    &devalidate_cache_new('namescache',$uname.':'.$udom);
-    $logmsg = 'Success modifying user '.$logmsg;
     &logthis($logmsg);
     return 'ok';
 }
@@ -8269,6 +8132,7 @@ sub add_prefix_and_part {
 # ---------------------------------------------------------------- Get metadata
 
 my %metaentry;
+my %importedpartids;
 sub metadata {
     my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
     $uri=&declutter($uri);
@@ -8295,6 +8159,10 @@ sub metadata {
 	if (defined($cached)) { return $result->{':'.$what}; }
     }
     {
+# Imported parts would go here
+        my %importedids=();
+        my @origfileimportpartids=();
+        my $importedparts=0;
 #
 # Is this a recursive call for a library?
 #
@@ -8378,27 +8246,55 @@ sub metadata {
 # This is not a package - some other kind of start tag
 #
 		    my $entry=$token->[1];
-		    my $unikey;
-		    if ($entry eq 'import') {
-			$unikey='';
-		    } else {
-			$unikey=$entry;
-		    }
-		    $unikey.=&add_prefix_and_part($prefix,$token->[2]->{'part'});
-
-		    if (defined($token->[2]->{'id'})) { 
-			$unikey.='_'.$token->[2]->{'id'}; 
-		    }
+		    my $unikey='';
 
 		    if ($entry eq 'import') {
 #
 # Importing a library here
 #
+                        my $location=$parser->get_text('/import');
+                        my $dir=$filename;
+                        $dir=~s|[^/]*$||;
+                        $location=&filelocation($dir,$location);
+                       
+                        my $importmode=$token->[2]->{'importmode'};
+                        if ($importmode eq 'problem') {
+# Import as problem/response
+                           $unikey=&add_prefix_and_part($prefix,$token->[2]->{'part'});
+                        } elsif ($importmode eq 'part') {
+# Import as part(s)
+                           $importedparts=1;
+# We need to get the original file and the imported file to get the part order correct
+# Good news: we do not need to worry about nested libraries, since parts cannot be nested
+# Load and inspect original file
+                           if ($#origfileimportpartids<0) {
+                              undef(%importedpartids);
+                              my $origfilelocation=$perlvar{'lonDocRoot'}.&clutter($uri);
+                              my $origfile=&getfile($origfilelocation);
+                              @origfileimportpartids=($origfile=~/<(part|import)[^>]*id\s*=\s*[\"\']([^\"\']+)[\"\'][^>]*>/gs);
+                           }
+
+# Load and inspect imported file
+                           my $impfile=&getfile($location);
+                           my @impfilepartids=($impfile=~/<part[^>]*id\s*=\s*[\"\']([^\"\']+)[\"\'][^>]*>/gs);
+                           if ($#impfilepartids>=0) {
+# This problem had parts
+                               $importedpartids{$token->[2]->{'id'}}=join(',',@impfilepartids);
+                           } else {
+# Importing by turning a single problem into a problem part
+# It gets the import-tags ID as part-ID
+                               $unikey=&add_prefix_and_part($prefix,$token->[2]->{'id'});
+                               $importedpartids{$token->[2]->{'id'}}=$token->[2]->{'id'};
+                           }
+                        } else {
+# Normal import
+                           $unikey=&add_prefix_and_part($prefix,$token->[2]->{'part'});
+                           if (defined($token->[2]->{'id'})) {
+                              $unikey.='_'.$token->[2]->{'id'};
+                           }
+                        }
+
 			if ($depthcount<20) {
-			    my $location=$parser->get_text('/import');
-			    my $dir=$filename;
-			    $dir=~s|[^/]*$||;
-			    $location=&filelocation($dir,$location);
 			    my $metadata = 
 				&metadata($uri,'keys', $location,$unikey,
 					  $depthcount+1);
@@ -8406,9 +8302,16 @@ sub metadata {
 				$metaentry{':'.$meta}=$metaentry{':'.$meta};
 				$metathesekeys{$meta}=1;
 			    }
-			}
-		    } else { 
 			
+                        }
+		    } else {
+#
+# Not importing, some other kind of non-package, non-library start tag
+# 
+                        $unikey=$entry.&add_prefix_and_part($prefix,$token->[2]->{'part'});
+                        if (defined($token->[2]->{'id'})) {
+                            $unikey.='_'.$token->[2]->{'id'};
+                        }
 			if (defined($token->[2]->{'name'})) { 
 			    $unikey.='_'.$token->[2]->{'name'}; 
 			}
@@ -8482,6 +8385,22 @@ sub metadata {
 	    grep { ! $seen{$_} ++ } (split(',',$metaentry{':packages'}));
 	$metaentry{':packages'} = join(',',@uniq_packages);
 
+        if ($importedparts) {
+# We had imported parts and need to rebuild partorder
+           $metaentry{':partorder'}='';
+           $metathesekeys{'partorder'}=1;
+           for (my $index=0;$index<$#origfileimportpartids;$index+=2) {
+               if ($origfileimportpartids[$index] eq 'part') {
+# original part, part of the problem
+                  $metaentry{':partorder'}.=','.$origfileimportpartids[$index+1];
+               } else {
+# we have imported parts at this position
+                  $metaentry{':partorder'}.=','.$importedpartids{$origfileimportpartids[$index+1]};
+               }
+           }
+           $metaentry{':partorder'}=~s/^\,//;
+        }
+
 	$metaentry{':keys'} = join(',',keys(%metathesekeys));
 	&metadata_generate_part0(\%metathesekeys,\%metaentry,$uri);
 	$metaentry{':allpossiblekeys'}=join(',',keys %metathesekeys);
@@ -9842,6 +9761,12 @@ sub get_dns {
 	return %libserv;
     }
 
+    sub unique_library {
+	#2x reverse removes all hostnames that appear more than once
+        my %unique = reverse &all_library();
+        return reverse %unique;
+    }
+
     sub get_servers {
 	&load_hosts_tab() if (!$loaded);
 
@@ -9865,6 +9790,11 @@ sub get_dns {
 	return %result;
     }
 
+    sub get_unique_servers {
+        my %unique = reverse &get_servers(@_);
+	return reverse %unique;
+    }
+
     sub host_domain {
 	&load_hosts_tab() if (!$loaded);
 
@@ -10433,7 +10363,7 @@ modifyuser($udom,$uname,$uid,$umode,$upa
 will update user information (firstname,middlename,lastname,generation,
 permanentemail), and if forceid is true, student/employee ID also.
 A user's institutional affiliation(s) can also be updated.
-User information fields will not be overwritten with empty entries
+User information fields will not be overwritten with empty entries 
 unless the field is included in the $candelete array reference.
 This array is included when a single user is modified via "Manage Users",
 or when Autoupdate.pl is run by cron in a domain.