--- loncom/lonnet/perl/lonnet.pm	2010/05/30 21:12:24	1.1066
+++ loncom/lonnet/perl/lonnet.pm	2010/09/24 03:15:04	1.1084
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1066 2010/05/30 21:12:24 droeschl Exp $
+# $Id: lonnet.pm,v 1.1084 2010/09/24 03:15:04 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -76,7 +76,7 @@ use HTTP::Date;
 use Image::Magick;
 
 use vars qw(%perlvar %spareid %pr %prp $memcache %packagetab $tmpdir
-            $_64bit %env %protocol);
+            $_64bit %env %protocol %loncaparevs %serverhomeIDs %needsrelease);
 
 my (%badServerCache, $memcache, %courselogs, %accesshash, %domainrolehash,
     %userrolehash, $processmarker, $dumpcount, %coursedombuf,
@@ -196,7 +196,7 @@ sub get_server_timezone {
 }
 
 sub get_server_loncaparev {
-    my ($dom,$lonhost) = @_;
+    my ($dom,$lonhost,$ignore_cache,$caller) = @_;
     if (defined($lonhost)) {
         if (!defined(&hostname($lonhost))) {
             undef($lonhost);
@@ -211,15 +211,74 @@ sub get_server_loncaparev {
         }
     }
     if (defined($lonhost)) {
-        my $cachetime = 24*3600;
-        my ($loncaparev,$cached)=&is_cached_new('serverloncaparev',$lonhost);
+        my $cachetime = 12*3600;
+        if (!$ignore_cache) {
+            my ($loncaparev,$cached)=&is_cached_new('serverloncaparev',$lonhost);
+            if (defined($cached)) {
+                return $loncaparev;
+            }
+        }
+        my ($answer,$loncaparev);
+        my @ids=&current_machine_ids();
+        if (grep(/^\Q$lonhost\E$/,@ids)) {
+            $answer = $perlvar{'lonVersion'};
+            if ($answer =~ /^[\'\"]?([\w.\-]+)[\'\"]?$/) {
+                $loncaparev = $1;
+            }
+        } else {
+            $answer = &reply('serverloncaparev',$lonhost);
+            if (($answer eq 'unknown_cmd') || ($answer eq 'con_lost')) {
+                if ($caller eq 'loncron') {
+                    my $ua=new LWP::UserAgent;
+                    $ua->timeout(4);
+                    my $protocol = $protocol{$lonhost};
+                    $protocol = 'http' if ($protocol ne 'https');
+                    my $url = $protocol.'://'.&hostname($lonhost).'/adm/about.html';
+                    my $request=new HTTP::Request('GET',$url);
+                    my $response=$ua->request($request);
+                    unless ($response->is_error()) {
+                        my $content = $response->content;
+                        if ($content =~ /<p>VERSION\:\s*([\w.\-]+)<\/p>/) {
+                            $loncaparev = $1;
+                        }
+                    }
+                } else {
+                    $loncaparev = $loncaparevs{$lonhost};
+                }
+            } elsif ($answer =~ /^[\'\"]?([\w.\-]+)[\'\"]?$/) {
+                $loncaparev = $1;
+            }
+        }
+        return &do_cache_new('serverloncaparev',$lonhost,$loncaparev,$cachetime);
+    }
+}
+
+sub get_server_homeID {
+    my ($hostname,$ignore_cache,$caller) = @_;
+    unless ($ignore_cache) {
+        my ($serverhomeID,$cached)=&is_cached_new('serverhomeID',$hostname);
         if (defined($cached)) {
-            return $loncaparev;
-        } else {
-            my $loncaparev = &reply('serverloncaparev',$lonhost);
-            return &do_cache_new('serverloncaparev',$lonhost,$loncaparev,$cachetime);
+            return $serverhomeID;
+        }
+    }
+    my $cachetime = 12*3600;
+    my $serverhomeID;
+    if ($caller eq 'loncron') { 
+        my @machine_ids = &machine_ids($hostname);
+        foreach my $id (@machine_ids) {
+            my $response = &reply('serverhomeID',$id);
+            unless (($response eq 'unknown_cmd') || ($response eq 'con_lost')) {
+                $serverhomeID = $response;
+                last;
+            }
+        }
+        if ($serverhomeID eq '') {
+            $serverhomeID = $machine_ids[-1];
         }
+    } else {
+        $serverhomeID = $serverhomeIDs{$hostname};
     }
+    return &do_cache_new('serverhomeID',$hostname,$serverhomeID,$cachetime);
 }
 
 # -------------------------------------------------- Non-critical communication
@@ -668,13 +727,23 @@ sub userload {
 # ------------------------------ Find server with least workload from spare.tab
 
 sub spareserver {
-    my ($loadpercent,$userloadpercent,$want_server_name) = @_;
+    my ($loadpercent,$userloadpercent,$want_server_name,$udom) = @_;
     my $spare_server;
     if ($userloadpercent !~ /\d/) { $userloadpercent=0; }
     my $lowest_load=($loadpercent > $userloadpercent) ? $loadpercent 
                                                      :  $userloadpercent;
-    
+    my ($uint_dom,$remotesessions);
+    if (($udom ne '') && (&domain($udom) ne '')) {
+        my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+        $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+        my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
+        $remotesessions = $udomdefaults{'remotesessions'};
+    }
     foreach my $try_server (@{ $spareid{'primary'} }) {
+        if ($uint_dom) {
+             next unless (&spare_can_host($udom,$uint_dom,$remotesessions,
+                                          $try_server));
+        }
 	($spare_server, $lowest_load) =
 	    &compare_server_load($try_server, $spare_server, $lowest_load);
     }
@@ -683,6 +752,10 @@ sub spareserver {
 
     if (!$found_server) {
 	foreach my $try_server (@{ $spareid{'default'} }) {
+            if ($uint_dom) {
+                next unless (&spare_can_host($udom,$uint_dom,$remotesessions,
+                                             $try_server));
+            }
 	    ($spare_server, $lowest_load) =
 		&compare_server_load($try_server, $spare_server, $lowest_load);
 	}
@@ -695,7 +768,7 @@ sub spareserver {
         }
         if (defined($spare_server)) {
             my $hostname = &hostname($spare_server);
-            if (defined($hostname)) {  
+            if (defined($hostname)) {
 	        $spare_server = $protocol.'://'.$hostname;
             }
         }
@@ -710,7 +783,7 @@ 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;
@@ -753,6 +826,27 @@ sub has_user_session {
     return 0;
 }
 
+# --------- determine least loaded server in a user's domain which allows login
+
+sub choose_server {
+    my ($udom) = @_;
+    my %domconfhash = &Apache::loncommon::get_domainconf($udom);
+    my %servers = &get_servers($udom);
+    my $lowest_load = 30000;
+    my ($login_host,$hostname);
+    foreach my $lonhost (keys(%servers)) {
+        my $loginvia = $domconfhash{$udom.'.login.loginvia_'.$lonhost};
+        if ($loginvia eq '') {
+            ($login_host, $lowest_load) =
+            &compare_server_load($lonhost, $login_host, $lowest_load);
+        }
+    }
+    if ($login_host ne '') {
+        $hostname = $servers{$login_host};
+    }
+    return ($login_host,$hostname);
+}
+
 # --------------------------------------------- Try to change a user's password
 
 sub changepass {
@@ -811,7 +905,7 @@ sub queryauthenticate {
 # --------- Try to authenticate user from domain's lib servers (first this one)
 
 sub authenticate {
-    my ($uname,$upass,$udom,$checkdefauth)=@_;
+    my ($uname,$upass,$udom,$checkdefauth,$clientcancheckhost)=@_;
     $upass=&escape($upass);
     $uname= &LONCAPA::clean_username($uname);
     my $uhome=&homeserver($uname,$udom,1);
@@ -834,7 +928,7 @@ sub authenticate {
 	    return 'no_host';
         }
     }
-    my $answer=reply("encrypt:auth:$udom:$uname:$upass:$checkdefauth",$uhome);
+    my $answer=reply("encrypt:auth:$udom:$uname:$upass:$checkdefauth:$clientcancheckhost",$uhome);
     if ($answer eq 'authorized') {
         if ($newhome) {
             &logthis("User $uname at $udom authorized by $uhome, but needs account");
@@ -852,6 +946,84 @@ sub authenticate {
     return 'no_host';
 }
 
+sub can_host_session {
+    my ($udom,$lonhost,$remoterev,$remotesessions,$hostedsessions) = @_;
+    my $canhost = 1;
+    my $host_idn = &Apache::lonnet::internet_dom($lonhost);
+    if (ref($remotesessions) eq 'HASH') {
+        if (ref($remotesessions->{'excludedomain'}) eq 'ARRAY') {
+            if (grep(/^\Q$host_idn\E$/,@{$remotesessions->{'excludedomain'}})) {
+                $canhost = 0;
+            } else {
+                $canhost = 1;
+            }
+        }
+        if (ref($remotesessions->{'includedomain'}) eq 'ARRAY') {
+            if (grep(/^\Q$host_idn\E$/,@{$remotesessions->{'includedomain'}})) {
+                $canhost = 1;
+            } else {
+                $canhost = 0;
+            }
+        }
+        if ($canhost) {
+            if ($remotesessions->{'version'} ne '') {
+                my ($reqmajor,$reqminor) = ($remotesessions->{'version'} =~ /^(\d+)\.(\d+)$/);
+                if ($reqmajor ne '' && $reqminor ne '') {
+                    if ($remoterev =~ /^\'?(\d+)\.(\d+)/) {
+                        my $major = $1;
+                        my $minor = $2;
+                        if (($major < $reqmajor ) ||
+                            (($major == $reqmajor) && ($minor < $reqminor))) {
+                            $canhost = 0;
+                        }
+                    } else {
+                        $canhost = 0;
+                    }
+                }
+            }
+        }
+    }
+    if ($canhost) {
+        if (ref($hostedsessions) eq 'HASH') {
+            if (ref($hostedsessions->{'excludedomain'}) eq 'ARRAY') {
+                if (grep(/^\Q$udom\E$/,@{$hostedsessions->{'excludedomain'}})) {
+                    $canhost = 0;
+                } else {
+                    $canhost = 1;
+                }
+            }
+            if (ref($hostedsessions->{'includedomain'}) eq 'ARRAY') {
+                if (grep(/^\Q$udom\E$/,@{$hostedsessions->{'includedomain'}})) {
+                    $canhost = 1;
+                } else {
+                    $canhost = 0;
+                }
+            }
+        }
+    }
+    return $canhost;
+}
+
+sub spare_can_host {
+    my ($udom,$uint_dom,$remotesessions,$try_server)=@_;
+    my $canhost=1;
+    my @intdoms;
+    my $internet_names = &Apache::lonnet::get_internet_names($try_server);
+    if (ref($internet_names) eq 'ARRAY') {
+        @intdoms = @{$internet_names};
+    }
+    unless (grep(/^\Q$uint_dom\E$/,@intdoms)) {
+        my $serverhomeID = &Apache::lonnet::get_server_homeID($try_server);
+        my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
+        my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
+        my $remoterev = &Apache::lonnet::get_server_loncaparev(undef,$try_server);
+        $canhost = &can_host_session($udom,$try_server,$remoterev,
+                                     $remotesessions,
+                                     $defdomdefaults{'hostedsessions'});
+    }
+    return $canhost;
+}
+
 # ---------------------- Find the homebase for a user from domain's lib servers
 
 my %homecache;
@@ -1328,7 +1500,7 @@ sub get_domain_defaults {
     my %domconfig =
          &Apache::lonnet::get_dom('configuration',['defaults','quotas',
                                   'requestcourses','inststatus',
-                                  'coursedefaults'],$domain);
+                                  'coursedefaults','usersessions'],$domain);
     if (ref($domconfig{'defaults'}) eq 'HASH') {
         $domdefaults{'lang_def'} = $domconfig{'defaults'}{'lang_def'}; 
         $domdefaults{'auth_def'} = $domconfig{'defaults'}{'auth_def'};
@@ -1368,6 +1540,14 @@ sub get_domain_defaults {
             $domdefaults{$item} = $domconfig{'coursedefaults'}{$item};
         }
     }
+    if (ref($domconfig{'usersessions'}) eq 'HASH') {
+        if (ref($domconfig{'usersessions'}{'remote'}) eq 'HASH') {
+            $domdefaults{'remotesessions'} = $domconfig{'usersessions'}{'remote'};
+        }
+        if (ref($domconfig{'usersessions'}{'hosted'}) eq 'HASH') {
+            $domdefaults{'hostedsessions'} = $domconfig{'usersessions'}{'hosted'};
+        }
+    }
     &Apache::lonnet::do_cache_new('domdefaults',$domain,\%domdefaults,
                                   $cachetime);
     return %domdefaults;
@@ -3035,7 +3215,7 @@ sub courseiddump {
     my ($domfilter,$descfilter,$sincefilter,$instcodefilter,$ownerfilter,
         $coursefilter,$hostidflag,$hostidref,$typefilter,$regexp_ok,
         $selfenrollonly,$catfilter,$showhidden,$caller,$cloner,$cc_clone,
-        $cloneonly,$createdbefore,$createdafter,$creationcontext)=@_;
+        $cloneonly,$createdbefore,$createdafter,$creationcontext,$domcloner)=@_;
     my $as_hash = 1;
     my %returnhash;
     if (!$domfilter) { $domfilter=''; }
@@ -3057,7 +3237,8 @@ sub courseiddump {
                          $showhidden.':'.$caller.':'.&escape($cloner).':'.
                          &escape($cc_clone).':'.$cloneonly.':'.
                          &escape($createdbefore).':'.&escape($createdafter).':'.
-                         &escape($creationcontext),$tryserver);
+                         &escape($creationcontext).':'.$domcloner,
+                         $tryserver);
                 my @pairs=split(/\&/,$rep);
                 foreach my $item (@pairs) {
                     my ($key,$value)=split(/\=/,$item,2);
@@ -3757,6 +3938,44 @@ sub coursedescription {
     return %returnhash;
 }
 
+sub update_released_required {
+    my ($needsrelease,$cdom,$cnum,$chome,$cid) = @_;
+    if ($cdom eq '' || $cnum eq '' || $chome eq '' || $cid eq '') {
+        $cid = $env{'request.course.id'};
+        $cdom = $env{'course.'.$cid.'.domain'};
+        $cnum = $env{'course.'.$cid.'.num'};
+        $chome = $env{'course.'.$cid.'.home'};
+    }
+    if ($needsrelease) {
+        my %curr_reqd_hash = &userenvironment($cdom,$cnum,'internal.releaserequired');
+        my $needsupdate;
+        if ($curr_reqd_hash{'internal.releaserequired'} eq '') {
+            $needsupdate = 1;
+        } else {
+            my ($currmajor,$currminor) = split(/\./,$curr_reqd_hash{'internal.releaserequired'});
+            my ($needsmajor,$needsminor) = split(/\./,$needsrelease);
+            if (($currmajor < $needsmajor) || ($currmajor == $needsmajor && $currminor < $needsminor)) {
+                $needsupdate = 1;
+            }
+        }
+        if ($needsupdate) {
+            my %needshash = (
+                             'internal.releaserequired' => $needsrelease,
+                            );
+            my $putresult = &put('environment',\%needshash,$cdom,$cnum);
+            if ($putresult eq 'ok') {
+                &appenv({'course.'.$cid.'.internal.releaserequired' => $needsrelease});
+                my %crsinfo = &courseiddump($cdom,'.',1,'.','.',$cnum,undef,undef,'.');
+                if (ref($crsinfo{$cid}) eq 'HASH') {
+                    $crsinfo{$cid}{'releaserequired'} = $needsrelease;
+                    &courseidput($cdom,\%crsinfo,$chome,'notime');
+                }
+            }
+        }
+    }
+    return;
+}
+
 # -------------------------------------------------See if a user is privileged
 
 sub privileged {
@@ -3796,9 +4015,10 @@ sub rolesinit {
     my ($domain,$username,$authhost)=@_;
     my $now=time;
     my %userroles = ('user.login.time' => $now);
-    my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
+    my $extra = &freeze_escape({'clientcheckrole' => 1});
+    my $rolesdump=reply("dump:$domain:$username:roles:.::$extra",$authhost);
     if (($rolesdump eq 'con_lost') || ($rolesdump eq '') || 
-        ($rolesdump =~ /^error:/)) { 
+        ($rolesdump =~ /^error:/)) {
         return \%userroles;
     }
     my %allroles=();
@@ -4700,7 +4920,7 @@ sub is_portfolio_file {
 }
 
 sub usertools_access {
-    my ($uname,$udom,$tool,$action,$context) = @_;
+    my ($uname,$udom,$tool,$action,$context,$userenvref,$domdefref,$is_advref)=@_;
     my ($access,%tools);
     if ($context eq '') {
         $context = 'tools';
@@ -4742,9 +4962,14 @@ sub usertools_access {
         $toolstatus = $env{'environment.'.$context.'.'.$tool};
         $inststatus = $env{'environment.inststatus'};
     } else {
-        my %userenv = &userenvironment($udom,$uname,$context.'.'.$tool,'inststatus');
-        $toolstatus = $userenv{$context.'.'.$tool};
-        $inststatus = $userenv{'inststatus'};
+        if (ref($userenvref) eq 'HASH') {
+            $toolstatus = $userenvref->{$context.'.'.$tool};
+            $inststatus = $userenvref->{'inststatus'};
+        } else {
+            my %userenv = &userenvironment($udom,$uname,$context.'.'.$tool,'inststatus');
+            $toolstatus = $userenv{$context.'.'.$tool};
+            $inststatus = $userenv{'inststatus'};
+        }
     }
 
     if ($toolstatus ne '') {
@@ -4756,8 +4981,17 @@ sub usertools_access {
         return $access;
     }
 
-    my $is_adv = &is_advanced_user($udom,$uname);
-    my %domdef = &get_domain_defaults($udom);
+    my ($is_adv,%domdef);
+    if (ref($is_advref) eq 'HASH') {
+        $is_adv = $is_advref->{'is_adv'};
+    } else {
+        $is_adv = &is_advanced_user($udom,$uname);
+    }
+    if (ref($domdefref) eq 'HASH') {
+        %domdef = %{$domdefref};
+    } else {
+        %domdef = &get_domain_defaults($udom);
+    }
     if (ref($domdef{$tool}) eq 'HASH') {
         if ($is_adv) {
             if ($domdef{$tool}{'_LC_adv'} ne '') {
@@ -5553,8 +5787,7 @@ sub update_allusers_table {
                'generation='.&escape($names->{'generation'}).'%%'.
                'permanentemail='.&escape($names->{'permanentemail'}).'%%'.
                'id='.&escape($names->{'id'}),$homeserver);
-    my $reply = &get_query_reply($queryid);
-    return $reply;
+    return;
 }
 
 # ------- Request retrieval of institutional classlists for course(s)
@@ -6477,6 +6710,10 @@ 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'))) {
@@ -6529,11 +6766,12 @@ sub modifyuser {
 		   ['firstname','middlename','lastname','generation','id',
                     'permanentemail','inststatus'],
 		   $udom,$uname);
-    my %names;
+    my (%names,%oldnames);
     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
@@ -6587,18 +6825,37 @@ sub modifyuser {
             }
         }
     }
-    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.', '.
+    my $logmsg = $udom.', '.$uname.', '.$uid.', '.
                  $umode.', '.$first.', '.$middle.', '.
-	         $last.', '.$gene.', '.$email.', '.$inststatus;
+                 $last.', '.$gene.', '.$email.', '.$inststatus;
     if ($env{'user.name'} ne '' && $env{'user.domain'}) {
         $logmsg .= ' by '.$env{'user.name'}.' at '.$env{'user.domain'};
     } 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;
+    }
+    my $sqlresult = &update_allusers_table($uname,$udom,\%names);
+    &devalidate_cache_new('namescache',$uname.':'.$udom);
+    $logmsg = 'Success modifying user '.$logmsg;
     &logthis($logmsg);
     return 'ok';
 }
@@ -8131,6 +8388,7 @@ sub add_prefix_and_part {
 # ---------------------------------------------------------------- Get metadata
 
 my %metaentry;
+my %importedpartids;
 sub metadata {
     my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
     $uri=&declutter($uri);
@@ -8157,6 +8415,10 @@ 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?
 #
@@ -8240,27 +8502,55 @@ 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);
@@ -8268,9 +8558,16 @@ 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'}; 
 			}
@@ -8344,6 +8641,22 @@ 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);
@@ -9620,6 +9933,7 @@ sub get_dns {
     my %libserv;
     my $loaded;
     my %name_to_host;
+    my %internetdom;
 
     sub parse_hosts_tab {
 	my ($file) = @_;
@@ -9627,7 +9941,7 @@ sub get_dns {
 	    next if ($configline =~ /^(\#|\s*$ )/x);
 	    next if ($configline =~ /^\^/);
 	    chomp($configline);
-	    my ($id,$domain,$role,$name,$protocol)=split(/:/,$configline);
+	    my ($id,$domain,$role,$name,$protocol,$intdom)=split(/:/,$configline);
 	    $name=~s/\s//g;
 	    if ($id && $domain && $role && $name) {
 		$hostname{$id}=$name;
@@ -9643,6 +9957,9 @@ sub get_dns {
                 } else {
                     $protocol{$id} = 'http';
                 }
+                if (defined($intdom)) {
+                    $internetdom{$id} = $intdom;
+                }
 	    }
 	}
     }
@@ -9752,6 +10069,13 @@ sub get_dns {
 	my @uniq = grep(!$seen{$_}++, values(%hostdom));
 	return @uniq;
     }
+
+    sub internet_dom {
+        &load_hosts_tab() if (!$loaded);
+
+        my ($lonid) = @_;
+        return $internetdom{$lonid};
+    }
 }
 
 { 
@@ -9869,6 +10193,40 @@ sub get_dns {
         return undef;
     }
 
+    sub get_internet_names {
+        my ($lonid) = @_;
+        return if ($lonid eq '');
+        my ($idnref,$cached)=
+            &Apache::lonnet::is_cached_new('internetnames',$lonid);
+        if ($cached) {
+            return $idnref;
+        }
+        my $ip = &get_host_ip($lonid);
+        my @hosts = &get_hosts_from_ip($ip);
+        my %iphost = &get_iphost();
+        my (@idns,%seen);
+        foreach my $id (@hosts) {
+            my $dom = &host_domain($id);
+            my $prim_id = &domain($dom,'primary');
+            my $prim_ip = &get_host_ip($prim_id);
+            next if ($seen{$prim_ip});
+            if (ref($iphost{$prim_ip}) eq 'ARRAY') {
+                foreach my $id (@{$iphost{$prim_ip}}) {
+                    my $intdom = &internet_dom($id);
+                    unless (grep(/^\Q$intdom\E$/,@idns)) {
+                        push(@idns,$intdom);
+                    }
+                }
+            }
+            $seen{$prim_ip} = 1;
+        }
+        return &Apache::lonnet::do_cache_new('internetnames',$lonid,\@idns,12*60*60);
+    }
+
+}
+
+sub all_loncaparevs {
+    return qw(1.1 1.2 1.3 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10);
 }
 
 BEGIN {
@@ -9946,6 +10304,53 @@ BEGIN {
     close($config);
 }
 
+# ---------------------------------------------------------- Read loncaparev table
+{
+    if (-e "$perlvar{'lonTabDir'}/loncaparevs.tab") {
+        if (open(my $config,"<$perlvar{'lonTabDir'}/loncaparevs.tab")) {
+            while (my $configline=<$config>) {
+                chomp($configline);
+                my ($hostid,$loncaparev)=split(/:/,$configline);
+                $loncaparevs{$hostid}=$loncaparev;
+            }
+            close($config);
+        }
+    }
+}
+
+# ---------------------------------------------------------- Read serverhostID table
+{
+    if (-e "$perlvar{'lonTabDir'}/serverhomeIDs.tab") {
+        if (open(my $config,"<$perlvar{'lonTabDir'}/serverhomeIDs.tab")) {
+            while (my $configline=<$config>) {
+                chomp($configline);
+                my ($name,$id)=split(/:/,$configline);
+                $serverhomeIDs{$name}=$id;
+            }
+            close($config);
+        }
+    }
+}
+
+{
+    my $file = $Apache::lonnet::perlvar{'lonTabDir'}.'/releaseslist.xml';
+    if (-e $file) {
+        my $parser = HTML::LCParser->new($file);
+        while (my $token = $parser->get_token()) {
+            if ($token->[0] eq 'S') {
+                my $item = $token->[1];
+                my $name = $token->[2]{'name'};
+                my $value = $token->[2]{'value'};
+                if ($item ne '' && $name ne '' && $value ne '') {
+                    my $release = $parser->get_text();
+                    $release =~ s/(^\s*|\s*$ )//gx;
+                    $needsrelease{$item.':'.$name.':'.$value} = $release;
+                }
+            }
+        }
+    }
+}
+
 # ------------- set up temporary directory
 {
     $tmpdir = $perlvar{'lonDaemons'}.'/tmp/';
@@ -10176,9 +10581,14 @@ authentication scheme
 
 =item *
 X<authenticate()>
-B<authenticate($uname,$upass,$udom)>: try to
+B<authenticate($uname,$upass,$udom,$checkdefauth,$clientcancheckhost)>: try to
 authenticate user from domain's lib servers (first use the current
 one). C<$upass> should be the users password.
+$checkdefauth is optional (value is 1 if a check should be made to
+   authenticate user using default authentication method, and allow
+   account creation if username does not have account in the domain).
+$clientcancheckhost is optional (value is 1 if checking whether the
+   server can host will occur on the client side in lonauth.pm).   
 
 =item *
 X<homeserver()>