--- loncom/interface/loncommon.pm	2019/02/04 01:32:50	1.1075.2.127.2.6
+++ loncom/interface/loncommon.pm	2023/09/11 13:54:11	1.1075.2.165
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # a pile of common routines
 #
-# $Id: loncommon.pm,v 1.1075.2.127.2.6 2019/02/04 01:32:50 raeburn Exp $
+# $Id: loncommon.pm,v 1.1075.2.165 2023/09/11 13:54:11 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -71,6 +71,7 @@ use Apache::lonuserutils();
 use Apache::lonuserstate();
 use Apache::courseclassifier();
 use LONCAPA qw(:DEFAULT :match);
+use HTTP::Request;
 use DateTime::TimeZone;
 use DateTime::Locale;
 use Encode();
@@ -427,7 +428,7 @@ sub studentbrowser_javascript {
 <script type="text/javascript" language="Javascript">
 // <![CDATA[
     var stdeditbrowser;
-    function openstdbrowser(formname,uname,udom,clicker,roleflag,ignorefilter,courseadvonly) {
+    function openstdbrowser(formname,uname,udom,clicker,roleflag,ignorefilter,courseadv) {
         var url = '/adm/pickstudent?';
         var filter;
 	if (!ignorefilter) {
@@ -442,7 +443,12 @@ sub studentbrowser_javascript {
                                     '&udomelement='+udom+
                                     '&clicker='+clicker;
 	if (roleflag) { url+="&roles=1"; }
-        if (courseadvonly) { url+="&courseadvonly=1"; }
+        if (courseadv == 'condition') {
+            if (document.getElementById('courseadv')) {
+                courseadv = document.getElementById('courseadv').value;
+            }
+        }
+        if ((courseadv == 'only') || (courseadv == 'none')) { url+="&courseadv="+courseadv; }
         var title = 'Student_Browser';
         var options = 'scrollbars=1,resizable=1,menubar=0';
         options += ',width=700,height=600';
@@ -474,7 +480,7 @@ ENDRESBRW
 }
 
 sub selectstudent_link {
-   my ($form,$unameele,$udomele,$courseadvonly,$clickerid)=@_;
+   my ($form,$unameele,$udomele,$courseadv,$clickerid)=@_;
    my $callargs = "'".&Apache::lonhtmlcommon::entity_encode($form)."','".
                       &Apache::lonhtmlcommon::entity_encode($unameele)."','".
                       &Apache::lonhtmlcommon::entity_encode($udomele)."'";
@@ -485,8 +491,12 @@ sub selectstudent_link {
 	   return '';
        }
        $callargs.=",'".&Apache::lonhtmlcommon::entity_encode($clickerid)."'";
-       if ($courseadvonly)  {
-           $callargs .= ",'',1,1";
+       if ($courseadv eq 'only') {
+           $callargs .= ",'',1,'$courseadv'";
+       } elsif ($courseadv eq 'none') {
+           $callargs .= ",'','','$courseadv'";
+       } elsif ($courseadv eq 'condition') {
+           $callargs .= ",'','','$courseadv'";
        }
        return '<span class="LC_nobreak">'.
               '<a href="javascript:openstdbrowser('.$callargs.');">'.
@@ -1368,7 +1378,7 @@ sub help_open_menu {
 }
 
 sub top_nav_help {
-    my ($text) = @_;
+    my ($text,$linkattr) = @_;
     $text = &mt($text);
     my $stay_on_page;
     unless ($env{'environment.remote'} eq 'on') {
@@ -1384,7 +1394,7 @@ sub top_nav_help {
     if ($link) {
         return <<"END";
 $banner_link
-<a href="$link" title="$title">$text</a>
+<a href="$link" title="$title" $linkattr>$text</a>
 END
     } else {
         return '&nbsp;'.$text.'&nbsp;';
@@ -1403,7 +1413,7 @@ sub help_menu_js {
         &Apache::loncommon::start_page('Help Menu', undef,
 				       {'frameset'    => 1,
 					'js_ready'    => 1,
-                                        'use_absolute' => $httphost, 
+                                        'use_absolute' => $httphost,
 					'add_entries' => {
 					    'border' => '0',
 					    'rows'   => "110,*",},});
@@ -2262,7 +2272,11 @@ sub select_form {
     if ($onchange) {
         $onchange = ' onchange="'.$onchange.'"';
     }
-    my $selectform = "<select name=\"$name\" size=\"1\"$onchange>\n";
+    my $disabled;
+    if ($readonly) {
+        $disabled = ' disabled="disabled"';
+    }
+    my $selectform = "<select name=\"$name\" size=\"1\"$onchange$disabled>\n";
     my @keys;
     if (exists($hashref->{'select_form_order'})) {
 	@keys=@{$hashref->{'select_form_order'}};
@@ -3113,14 +3127,11 @@ sub authform_filesystem {
                     $fsyscheck.' onchange="'.$jscall.'" onclick="'.
                     $jscall.'"'.$disabled.' />';
     }
-    $autharg = '<input type="text" size="10" name="fsysarg" value=""'.
+    $autharg = '<input type="password" size="10" name="fsysarg" value=""'.
                ' onchange="'.$jscall.'"'.$disabled.' />';
     $result = &mt
         ('[_1] Filesystem Authenticated (with initial password [_2])',
-         '<label><input type="radio" name="login" value="fsys" '.
-         $fsyscheck.'onchange="'.$jscall.'" onclick="'.$jscall.'"'.$disabled.' />',
-         '</label><input type="password" size="10" name="fsysarg" value="" '.
-                  'onchange="'.$jscall.'"'.$disabled.' />');
+         '<label>'.$authtype,'</label>'.$autharg);
     return $result;
 }
 
@@ -3166,6 +3177,79 @@ sub get_assignable_auth {
     return ($authnum,%can_assign);
 }
 
+sub check_passwd_rules {
+    my ($domain,$plainpass) = @_;
+    my %passwdconf = &Apache::lonnet::get_passwdconf($domain);
+    my ($min,$max,@chars,@brokerule,$warning);
+    $min = $Apache::lonnet::passwdmin;
+    if (ref($passwdconf{'chars'}) eq 'ARRAY') {
+        if ($passwdconf{'min'} =~ /^\d+$/) {
+            if ($passwdconf{'min'} > $min) {
+                $min = $passwdconf{'min'};
+            }
+        }
+        if ($passwdconf{'max'} =~ /^\d+$/) {
+            $max = $passwdconf{'max'};
+        }
+        @chars = @{$passwdconf{'chars'}};
+    }
+    if (($min) && (length($plainpass) < $min)) {
+        push(@brokerule,'min');
+    }
+    if (($max) && (length($plainpass) > $max)) {
+        push(@brokerule,'max');
+    }
+    if (@chars) {
+        my %rules;
+        map { $rules{$_} = 1; } @chars;
+        if ($rules{'uc'}) {
+            unless ($plainpass =~ /[A-Z]/) {
+                push(@brokerule,'uc');
+            }
+        }
+        if ($rules{'lc'}) {
+            unless ($plainpass =~ /[a-z]/) {
+                push(@brokerule,'lc');
+            }
+        }
+        if ($rules{'num'}) {
+            unless ($plainpass =~ /\d/) {
+                push(@brokerule,'num');
+            }
+        }
+        if ($rules{'spec'}) {
+            unless ($plainpass =~ /[!"#$%&'()*+,\-.\/:;<=>?@[\\\]^_`{|}~]/) {
+                push(@brokerule,'spec');
+            }
+        }
+    }
+    if (@brokerule) {
+        my %rulenames = &Apache::lonlocal::texthash(
+            uc   => 'At least one upper case letter',
+            lc   => 'At least one lower case letter',
+            num  => 'At least one number',
+            spec => 'At least one non-alphanumeric',
+        );
+        $rulenames{'uc'} .= ': ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+        $rulenames{'lc'} .= ': abcdefghijklmnopqrstuvwxyz';
+        $rulenames{'num'} .= ': 0123456789';
+        $rulenames{'spec'} .= ': !&quot;\#$%&amp;\'()*+,-./:;&lt;=&gt;?@[\]^_\`{|}~';
+        $rulenames{'min'} = &mt('Minimum password length: [_1]',$min);
+        $rulenames{'max'} = &mt('Maximum password length: [_1]',$max);
+        $warning = &mt('Password did not satisfy the following:').'<ul>';
+        foreach my $rule ('min','max','uc','lc','num','spec') {
+            if (grep(/^$rule$/,@brokerule)) {
+                $warning .= '<li>'.$rulenames{$rule}.'</li>';
+            }
+        }
+        $warning .= '</ul>';
+    }
+    if (wantarray) {
+        return @brokerule;
+    }
+    return $warning;
+}
+
 ###############################################################
 ##    Get Kerberos Defaults for Domain                 ##
 ###############################################################
@@ -4336,6 +4420,59 @@ sub get_student_view_with_retries {
     }
 }
 
+sub css_links {
+    my ($currsymb,$level) = @_;
+    my ($links,@symbs,%cssrefs,%httpref);
+    if ($level eq 'map') {
+        my $navmap = Apache::lonnavmaps::navmap->new();
+        if (ref($navmap)) {
+            my ($map,undef,$url)=&Apache::lonnet::decode_symb($currsymb);
+            my @resources = $navmap->retrieveResources($map,sub { $_[0]->is_problem() },0,0);
+            foreach my $res (@resources) {
+                if (ref($res) && $res->symb()) {
+                    push(@symbs,$res->symb());
+                }
+            }
+        }
+    } else {
+        @symbs = ($currsymb);
+    }
+    foreach my $symb (@symbs) {
+        my $css_href = &Apache::lonnet::EXT('resource.0.cssfile',$symb);
+        if ($css_href =~ /\S/) {
+            unless ($css_href =~ m{https?://}) {
+                my $url = (&Apache::lonnet::decode_symb($symb))[-1];
+                my $proburl =  &Apache::lonnet::clutter($url);
+                my ($probdir) = ($proburl =~ m{(.+)/[^/]+$});
+                unless ($css_href =~ m{^/}) {
+                    $css_href = &Apache::lonnet::hreflocation($probdir,$css_href);
+                }
+                if ($css_href =~ m{^/(res|uploaded)/}) {
+                    unless (($httpref{'httpref.'.$css_href}) ||
+                            (&Apache::lonnet::is_on_map($css_href))) {
+                        my $thisurl = $proburl;
+                        if ($env{'httpref.'.$proburl}) {
+                            $thisurl = $env{'httpref.'.$proburl};
+                        }
+                        $httpref{'httpref.'.$css_href} = $thisurl;
+                    }
+                }
+            }
+            $cssrefs{$css_href} = 1;
+        }
+    }
+    if (keys(%httpref)) {
+        &Apache::lonnet::appenv(\%httpref);
+    }
+    if (keys(%cssrefs)) {
+        foreach my $css_href (keys(%cssrefs)) {
+            next unless ($css_href =~ m{^(/res/|/uploaded/|https?://)});
+            $links .= '<link rel="stylesheet" type="text/css" href="'.$css_href.'" />'."\n";
+        }
+    }
+    return $links;
+}
+
 =pod
 
 =item * &get_student_answers() 
@@ -4591,13 +4728,96 @@ sub findallcourses {
 ###############################################
 
 sub blockcheck {
-    my ($setters,$activity,$uname,$udom,$url,$is_course) = @_;
+    my ($setters,$activity,$clientip,$uname,$udom,$url,$is_course,$symb,$caller) = @_;
 
+    unless ($activity eq 'docs') {
+        my ($has_evb,$check_ipaccess);
+        my $dom = $env{'user.domain'};
+        if ($env{'request.course.id'}) {
+            my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+            my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+            my $checkrole = "cm./$cdom/$cnum";
+            my $sec = $env{'request.course.sec'};
+            if ($sec ne '') {
+                $checkrole .= "/$sec";
+            }
+            if ((&Apache::lonnet::allowed('evb',undef,undef,$checkrole)) &&
+                ($env{'request.role'} !~ /^st/)) {
+                $has_evb = 1;
+            }
+            unless ($has_evb) {
+                if (($activity eq 'printout') || ($activity eq 'grades') || ($activity eq 'search') ||
+                    ($activity eq 'boards') || ($activity eq 'groups') || ($activity eq 'chat')) {
+                    if ($udom eq $cdom) {
+                        $check_ipaccess = 1;
+                    }
+                }
+            }
+        } elsif (($activity eq 'com') || ($activity eq 'port') || ($activity eq 'blogs') ||
+                ($activity eq 'about') || ($activity eq 'wishlist') || ($activity eq 'passwd')) {
+            my $checkrole;
+            if ($env{'request.role.domain'} eq '') {
+                $checkrole = "cm./$env{'user.domain'}/";
+            } else {
+                $checkrole = "cm./$env{'request.role.domain'}/";
+            }
+            if (($checkrole) && (&Apache::lonnet::allowed('evb',undef,undef,$checkrole))) {
+                $has_evb = 1;
+            }
+        }
+        unless ($has_evb || $check_ipaccess) {
+            my @machinedoms = &Apache::lonnet::current_machine_domains();
+            if (($dom eq 'public') && ($activity eq 'port')) {
+                $dom = $udom;
+            }
+            if (($dom ne '') && (grep(/^\Q$dom\E$/,@machinedoms))) {
+                $check_ipaccess = 1;
+            } else {
+                my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
+                my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
+                my $prim = &Apache::lonnet::domain($dom,'primary');
+                my $intdom = &Apache::lonnet::internet_dom($prim);
+                if (($intdom ne '') && (ref($internet_names) eq 'ARRAY')) {
+                    if (grep(/^\Q$intdom\E$/,@{$internet_names})) {
+                        $check_ipaccess = 1;
+                    }
+                }
+            }
+        }
+        if ($check_ipaccess) {
+            my ($ipaccessref,$cached)=&Apache::lonnet::is_cached_new('ipaccess',$dom);
+            unless (defined($cached)) {
+                my %domconfig =
+                    &Apache::lonnet::get_dom('configuration',['ipaccess'],$dom);
+                $ipaccessref = &Apache::lonnet::do_cache_new('ipaccess',$dom,$domconfig{'ipaccess'},1800);
+            }
+            if ((ref($ipaccessref) eq 'HASH') && ($clientip)) {
+                foreach my $id (keys(%{$ipaccessref})) {
+                    if (ref($ipaccessref->{$id}) eq 'HASH') {
+                        my $range = $ipaccessref->{$id}->{'ip'};
+                        if ($range) {
+                            if (&Apache::lonnet::ip_match($clientip,$range)) {
+                                if (ref($ipaccessref->{$id}->{'commblocks'}) eq 'HASH') {
+                                    if ($ipaccessref->{$id}->{'commblocks'}->{$activity} eq 'on') {
+                                        return ('','','',$id,$dom);
+                                        last;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        if (($activity eq 'wishlist') || ($activity eq 'annotate')) {
+            return ();
+        }
+    }
     if (defined($udom) && defined($uname)) {
         # If uname and udom are for a course, check for blocks in the course.
         if (($is_course) || (&Apache::lonnet::is_course($udom,$uname))) {
             my ($startblock,$endblock,$triggerblock) =
-                &get_blocks($setters,$activity,$udom,$uname,$url);
+                &get_blocks($setters,$activity,$udom,$uname,$url,$symb,$caller);
             return ($startblock,$endblock,$triggerblock);
         }
     } else {
@@ -4608,7 +4828,10 @@ sub blockcheck {
     my $startblock = 0;
     my $endblock = 0;
     my $triggerblock = '';
-    my %live_courses = &findallcourses(undef,$uname,$udom);
+    my %live_courses;
+    unless (($activity eq 'wishlist') || ($activity eq 'annotate')) {
+        %live_courses = &findallcourses(undef,$uname,$udom);
+    }
 
     # If uname is for a user, and activity is course-specific, i.e.,
     # boards, chat or groups, check for blocking in current course only.
@@ -4720,11 +4943,11 @@ sub blockcheck {
                  ($env{'request.role'} !~ m{^st\./\Q$cdom\E/\Q$cnum\E}));
         next if ($no_userblock);
 
-        # Retrieve blocking times and identity of locker for course
+        # Retrieve blocking times and identity of blocker for course
         # of specified user, unless user has 'evb' privilege.
         
         my ($start,$end,$trigger) = 
-            &get_blocks($setters,$activity,$cdom,$cnum,$url);
+            &get_blocks($setters,$activity,$cdom,$cnum,$url,$symb,$caller);
         if (($start != 0) && 
             (($startblock == 0) || ($startblock > $start))) {
             $startblock = $start;
@@ -4744,7 +4967,7 @@ sub blockcheck {
 }
 
 sub get_blocks {
-    my ($setters,$activity,$cdom,$cnum,$url) = @_;
+    my ($setters,$activity,$cdom,$cnum,$url,$symb,$caller) = @_;
     my $startblock = 0;
     my $endblock = 0;
     my $triggerblock = '';
@@ -4757,7 +4980,13 @@ sub get_blocks {
     my $now = time;
     my %commblocks = &Apache::lonnet::get_comm_blocks($cdom,$cnum);
     if ($activity eq 'docs') {
-        @blockers = &Apache::lonnet::has_comm_blocking('bre',undef,$url,\%commblocks);
+        my ($blocked,$nosymbcache,$noenccheck);
+        if (($caller eq 'blockedaccess') || ($caller eq 'blockingstatus')) {
+            $blocked = 1;
+            $nosymbcache = 1;
+            $noenccheck = 1;
+        }
+        @blockers = &Apache::lonnet::has_comm_blocking('bre',$symb,$url,$nosymbcache,$noenccheck,$blocked,\%commblocks);
         foreach my $block (@blockers) {
             if ($block =~ /^firstaccess____(.+)$/) {
                 my $item = $1;
@@ -4809,13 +5038,19 @@ sub get_blocks {
                 my $end = $start + $env{'course.'.$cdom.'_'.$cnum.'.timerinterval.'.$timersymb}; 
                 if ($start && $end) {
                     if (($start <= time) && ($end >= time)) {
-                        unless (grep(/^\Q$block\E$/,@blockers)) {
-                            push(@blockers,$block);
-                            $triggered{$block} = {
-                                                   start => $start,
-                                                   end   => $end,
-                                                   type  => $type,
-                                                 };
+                        if (ref($commblocks{$block}) eq 'HASH') {
+                            if (ref($commblocks{$block}{'blocks'}) eq 'HASH') {
+                                if ($commblocks{$block}{'blocks'}{$activity} eq 'on') {
+                                    unless(grep(/^\Q$block\E$/,@blockers)) {
+                                        push(@blockers,$block);
+                                        $triggered{$block} = {
+                                                               start => $start,
+                                                               end   => $end,
+                                                               type  => $type,
+                                                             };
+                                    }
+                                }
+                            }
                         }
                     }
                 }
@@ -4879,14 +5114,17 @@ sub parse_block_record {
 }
 
 sub blocking_status {
-    my ($activity,$uname,$udom,$url,$is_course) = @_;
+    my ($activity,$clientip,$uname,$udom,$url,$is_course,$symb,$caller) = @_;
     my %setters;
 
 # check for active blocking
-    my ($startblock,$endblock,$triggerblock) = 
-        &blockcheck(\%setters,$activity,$uname,$udom,$url,$is_course);
+    if ($clientip eq '') {
+        $clientip = &Apache::lonnet::get_requestor_ip();
+    }
+    my ($startblock,$endblock,$triggerblock,$by_ip,$blockdom) = 
+        &blockcheck(\%setters,$activity,$clientip,$uname,$udom,$url,$is_course,$symb,$caller);
     my $blocked = 0;
-    if ($startblock && $endblock) {
+    if (($startblock && $endblock) || ($by_ip)) {
         $blocked = 1;
     }
 
@@ -4895,12 +5133,17 @@ sub blocking_status {
 
 # build a link to a popup window containing the details
     my $querystring  = "?activity=$activity";
-# $uname and $udom decide whose portfolio the user is trying to look at
-    if (($activity eq 'port') || ($activity eq 'passwd')) {
+# $uname and $udom decide whose portfolio (or information page) the user is trying to look at
+    if (($activity eq 'port') || ($activity eq 'about') || ($activity eq 'passwd')) {
         $querystring .= "&amp;udom=$udom"      if ($udom =~ /^$match_domain$/);
         $querystring .= "&amp;uname=$uname"    if ($uname =~ /^$match_username$/);
     } elsif ($activity eq 'docs') {
-        $querystring .= '&amp;url='.&HTML::Entities::encode($url,'&"');
+        my $showurl = &Apache::lonenc::check_encrypt($url);
+        $querystring .= '&amp;url='.&HTML::Entities::encode($showurl,'\'&"<>');
+        if ($symb) {
+            my $showsymb = &Apache::lonenc::check_encrypt($symb);
+            $querystring .= '&amp;symb='.&HTML::Entities::encode($showsymb,'\'&"<>');
+        }
     }
 
     my $output .= <<'END_MYBLOCK';
@@ -4925,6 +5168,16 @@ END_MYBLOCK
         $text = &mt('Printing Blocked');
     } elsif ($activity eq 'passwd') {
         $text = &mt('Password Changing Blocked');
+    } elsif ($activity eq 'grades') {
+        $text = &mt('Gradebook Blocked');
+    } elsif ($activity eq 'search') {
+        $text = &mt('Search Blocked');
+    } elsif ($activity eq 'about') {
+        $text = &mt('Access to User Information Pages Blocked');
+    } elsif ($activity eq 'wishlist') {
+        $text = &mt('Access to Stored Links Blocked');
+    } elsif ($activity eq 'annotate') {
+        $text = &mt('Access to Annotations Blocked');
     }
     $output .= <<"END_BLOCK";
 <div class='$class'>
@@ -4949,7 +5202,14 @@ sub check_ip_acc {
         return 1;
     }
     my $allowed=0;
-    my $ip=$ENV{'REMOTE_ADDR'} || $clientip || $env{'request.host'};
+    my $ip;
+    if (($ENV{'REMOTE_ADDR'} eq '127.0.0.1') ||
+        ($ENV{'REMOTE_ADDR'} eq &Apache::lonnet::get_host_ip($Apache::lonnet::perlvar{'lonHostID'}))) {
+        $ip = $env{'request.host'} || $ENV{'REMOTE_ADDR'} || $clientip;
+    } else {
+        my $remote_ip = &Apache::lonnet::get_requestor_ip();
+        $ip = $remote_ip || $env{'request.host'} || $clientip;
+    }
 
     my $name;
     foreach my $pattern (split(',',$acc)) {
@@ -4994,87 +5254,6 @@ sub check_ip_acc {
     return $allowed;
 }
 
-sub check_slotip_acc {
-    my ($acc,$clientip)=@_;
-    &Apache::lonxml::debug("acc is $acc");
-    if (!defined($acc) || $acc =~ /^\s*$/ || $acc =~/^\s*no\s*$/i) {
-        return 1;
-    }
-    my $allowed;
-    my $ip=$ENV{'REMOTE_ADDR'} || $clientip || $env{'request.host'};
-
-    my $name;
-    my %access = (
-                     allowfrom => 1,
-                     denyfrom  => 0,
-                 );
-    my @allows;
-    my @denies;
-    foreach my $item (split(',',$acc)) {
-        $item =~ s/^\s*//;
-        $item =~ s/\s*$//;
-        my $pattern;
-        if ($item =~ /^\!(.+)$/) {
-            push(@denies,$1);
-        } else {
-            push(@allows,$item);
-        }
-   }
-   my $numdenies = scalar(@denies);
-   my $numallows = scalar(@allows);
-   my $count = 0;
-   foreach my $pattern (@denies,@allows) {
-        $count ++;
-        my $acctype = 'allowfrom';
-        if ($count <= $numdenies) {
-            $acctype = 'denyfrom';
-        }
-        if ($pattern =~ /\*$/) {
-            #35.8.*
-            $pattern=~s/\*//;
-            if ($ip =~ /^\Q$pattern\E/) { $allowed=$access{$acctype}; }
-        } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {
-            #35.8.3.[34-56]
-            my $low=$2;
-            my $high=$3;
-            $pattern=$1;
-            if ($ip =~ /^\Q$pattern\E/) {
-                my $last=(split(/\./,$ip))[3];
-                if ($last <=$high && $last >=$low) { $allowed=$access{$acctype}; }
-            }
-        } elsif ($pattern =~ /^\*/) {
-            #*.msu.edu
-            $pattern=~s/\*//;
-            if (!defined($name)) {
-                use Socket;
-                my $netaddr=inet_aton($ip);
-                ($name)=gethostbyaddr($netaddr,AF_INET);
-            }
-            if ($name =~ /\Q$pattern\E$/i) { $allowed=$access{$acctype}; }
-        } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
-            #127.0.0.1
-            if ($ip =~ /^\Q$pattern\E/) { $allowed=$access{$acctype}; }
-        } else {
-            #some.name.com
-            if (!defined($name)) {
-                use Socket;
-                my $netaddr=inet_aton($ip);
-                ($name)=gethostbyaddr($netaddr,AF_INET);
-            }
-            if ($name =~ /\Q$pattern\E$/i) { $allowed=$access{$acctype}; }
-        }
-        if ($allowed =~ /^(0|1)$/) { last; }
-    }
-    if ($allowed eq '') {
-        if ($numdenies && !$numallows) {
-            $allowed = 1;
-        } else {
-            $allowed = 0;
-        }
-    }
-    return $allowed;
-}
-
 ###############################################
 
 =pod
@@ -5151,6 +5330,17 @@ sub get_domainconf {
                                     }
                                 }
                             }
+                        } elsif ($key eq 'saml') {
+                            if (ref($domconfig{'login'}{$key}) eq 'HASH') {
+                                foreach my $host (keys(%{$domconfig{'login'}{$key}})) {
+                                    if (ref($domconfig{'login'}{$key}{$host}) eq 'HASH') {
+                                        $designhash{$udom.'.login.'.$key.'_'.$host} = 1;
+                                        foreach my $item ('text','img','alt','url','title','notsso') {
+                                            $designhash{$udom.'.login.'.$key.'_'.$item.'_'.$host} = $domconfig{'login'}{$key}{$host}{$item};
+                                        }
+                                    }
+                                }
+                            }
                         } else {
                             foreach my $img (keys(%{$domconfig{'login'}{$key}})) {
                                 $designhash{$udom.'.login.'.$key.'_'.$img} = 
@@ -5255,8 +5445,12 @@ sub domainlogo {
 		&Apache::lonnet::repcopy($local_name);
 	    }
 	   $imgsrc = &lonhttpdurl($imgsrc);
-        } 
-        return '<img src="'.$imgsrc.'" alt="'.$domain.'" />';
+        }
+        my $alttext = $domain;
+        if ($designhash{$domain.'.login.alttext_domlogo'} ne '') {
+            $alttext = $designhash{$domain.'.login.alttext_domlogo'};
+        }
+        return '<img src="'.$imgsrc.'" alt="'.$alttext.'" id="lclogindomlogo" />';
     } elsif (defined(&Apache::lonnet::domain($domain,'description'))) {
         return &Apache::lonnet::domain($domain,'description');
     } else {
@@ -5471,6 +5665,10 @@ Inputs:
 
 =item * $args, optional argument valid values are
             no_auto_mt_title -> prevents &mt()ing the title arg
+            use_absolute     -> for external resource or syllabus, this will
+                                contain https://<hostname> if server uses
+                                https (as per hosts.tab), but request is for http
+            hostname         -> hostname, from $r->hostname().
 
 =item * $advtoolsref, optional argument, ref to an array containing
             inlineremote items to be added in "Functions" menu below
@@ -5496,6 +5694,7 @@ sub bodytag {
     }
     if (!$args->{'no_auto_mt_title'}) { $title = &mt($title); }
     my $httphost = $args->{'use_absolute'};
+    my $hostname = $args->{'hostname'};
 
     $function = &get_users_function() if (!$function);
     my $img =    &designparm($function.'.img',$domain);
@@ -5515,12 +5714,24 @@ sub bodytag {
     if ($realm) {
         $realm = '/'.$realm;
     }
-    if ($role  eq 'ca') {
+    if ($role eq 'ca') {
         my ($rdom,$rname) = ($realm =~ m{^/($match_domain)/($match_username)$});
         $realm = &plainname($rname,$rdom);
     } 
 # realm
+    my ($cid,$sec);
     if ($env{'request.course.id'}) {
+        $cid = $env{'request.course.id'};
+        if ($env{'request.course.sec'}) {
+            $sec = $env{'request.course.sec'};
+        }
+    } elsif ($realm =~ m{^/($match_domain)/($match_courseid)(?:|/(\w+))$}) {
+        if (&Apache::lonnet::is_course($1,$2)) {
+            $cid = $1.'_'.$2;
+            $sec = $3;
+        }
+    }
+    if ($cid) {
         if ($env{'request.role'} !~ /^cr/) {
             $role = &Apache::lonnet::plaintext($role,&course_type());
         } elsif ($role =~ m{^cr/($match_domain)/\1-domainconfig/(\w+)$}) {
@@ -5532,10 +5743,10 @@ sub bodytag {
         } else {
             $role = (split(/\//,$role,4))[-1];
         }
-        if ($env{'request.course.sec'}) {
-            $role .= ('&nbsp;'x2).'-&nbsp;'.&mt('section:').'&nbsp;'.$env{'request.course.sec'};
+        if ($sec) {
+            $role .= ('&nbsp;'x2).'-&nbsp;'.&mt('section:').'&nbsp;'.$sec;
         }   
-	$realm = $env{'course.'.$env{'request.course.id'}.'.description'};
+	$realm = $env{'course.'.$cid.'.description'};
     } else {
         $role = &Apache::lonnet::plaintext($role);
     }
@@ -5557,15 +5768,13 @@ sub bodytag {
     if ($public) {
 	undef($role);
     }
-    
+
     my $titleinfo = '<h1>'.$title.'</h1>';
     #
     # Extra info if you are the DC
     my $dc_info = '';
-    if ($env{'user.adv'} && exists($env{'user.role.dc./'.
-                        $env{'course.'.$env{'request.course.id'}.
-                                 '.domain'}.'/'})) {
-        my $cid = $env{'request.course.id'};
+    if (($env{'user.adv'}) && ($env{'request.course.id'}) &&
+        (exists($env{'user.role.dc./'.$env{'course.'.$cid.'.domain'}.'/'}))) {
         $dc_info = $cid.' '.$env{'course.'.$cid.'.internal.coursecode'};
         $dc_info =~ s/\s+$//;
     }
@@ -5584,7 +5793,7 @@ sub bodytag {
         &Apache::lonmenu::prepare_functions($env{'request.noversionuri'},
                                             $forcereg,$args->{'group'},
                                             $args->{'bread_crumbs'},
-                                            $advtoolsref,'',\$forbodytag);
+                                            $advtoolsref,'','',\$forbodytag);
         unless (ref($args->{'bread_crumbs'}) eq 'ARRAY') {
             $funclist = $forbodytag;
         }
@@ -5597,11 +5806,11 @@ sub bodytag {
         $bodytag .= Apache::lonhtmlcommon::scripttag(
             Apache::lonmenu::utilityfunctions($httphost), 'start');
 
-        my ($left,$right) = Apache::lonmenu::primary_menu();
+        my ($left,$right) = Apache::lonmenu::primary_menu($args->{'links_disabled'});
 
         if ($env{'request.noversionuri'} =~ m{^/res/adm/pages/}) {
             if ($dc_info) {
-                 $dc_info = qq|<span class="LC_cusr_subheading">$dc_info</span>|;
+                $dc_info = qq|<span class="LC_cusr_subheading">$dc_info</span>|;
             }
             $bodytag .= qq|<div id="LC_nav_bar">$left $role<br />
                            <em>$realm</em> $dc_info</div>|;
@@ -5625,22 +5834,24 @@ sub bodytag {
         }
         #don't show menus for public users
         if (!$public){
-            $bodytag .= Apache::lonmenu::secondary_menu($httphost);
+            $bodytag .= Apache::lonmenu::secondary_menu($httphost,$args->{'links_disabled'});
             $bodytag .= Apache::lonmenu::serverform();
             $bodytag .= Apache::lonhtmlcommon::scripttag('', 'end');
             if ($env{'request.state'} eq 'construct') {
                 $bodytag .= &Apache::lonmenu::innerregister($forcereg,
-                                $args->{'bread_crumbs'});
+                                $args->{'bread_crumbs'},'','',$hostname);
             } elsif ($forcereg) {
                 $bodytag .= &Apache::lonmenu::innerregister($forcereg,undef,
                                                             $args->{'group'},
-                                                            $args->{'hide_buttons'});
+                                                            $args->{'hide_buttons'},
+                                                            $hostname);
             } else {
                 my $forbodytag;
                 &Apache::lonmenu::prepare_functions($env{'request.noversionuri'},
                                                     $forcereg,$args->{'group'},
                                                     $args->{'bread_crumbs'},
-                                                    $advtoolsref,'',\$forbodytag);
+                                                    $advtoolsref,'',$hostname,
+                                                    \$forbodytag);
                 unless (ref($args->{'bread_crumbs'}) eq 'ARRAY') {
                     $bodytag .= $forbodytag;
                 }
@@ -5782,6 +5993,9 @@ sub endbodytag {
 	        $endbodytag;
         }
     }
+    if ((ref($args) eq 'HASH') && ($args->{'dashjs'})) {
+        $endbodytag = &Apache::lonhtmlcommon::dash_to_minus_js().$endbodytag;
+    }
     return $endbodytag;
 }
 
@@ -6154,6 +6368,11 @@ td.LC_menubuttons_text {
   background: $tabbg;
 }
 
+td.LC_zero_height {
+  line-height: 0;
+  cellpadding: 0;
+}
+
 table.LC_data_table {
   border: 1px solid #000000;
   border-collapse: separate;
@@ -6744,7 +6963,8 @@ table.LC_prior_tries td {
   padding: 6px;
 }
 
-.LC_answer_unknown {
+.LC_answer_unknown,
+.LC_answer_warning {
   background: orange;
   color: black;
   padding: 6px;
@@ -6826,6 +7046,7 @@ table.LC_data_table tr > td.LC_docs_entr
   color: #990000;
 }
 
+.LC_domprefs_email,
 .LC_docs_reinit_warn,
 .LC_docs_ext_edit {
   font-size: x-small;
@@ -7734,6 +7955,26 @@ ul.LC_funclist li {
 		cursor:pointer;
 }
 
+.LCisDisabled {
+  cursor: not-allowed;
+  opacity: 0.5;
+}
+
+a[aria-disabled="true"] {
+  color: currentColor;
+  display: inline-block;  /* For IE11/ MS Edge bug */
+  pointer-events: none;
+  text-decoration: none;
+}
+
+pre.LC_wordwrap {
+  white-space: pre-wrap;
+  white-space: -moz-pre-wrap;
+  white-space: -pre-wrap;
+  white-space: -o-pre-wrap;
+  word-wrap: break-word;
+}
+
 /*
   styles used by TTH when "Default set of options to pass to tth/m
   when converting TeX" in course settings has been set
@@ -7893,43 +8134,99 @@ ADDMETA
                 my $dom_in_use = $Apache::lonnet::perlvar{'lonDefDomain'};
                 unless (&Apache::lonnet::allowed('mau',$dom_in_use)) {
                     my %domdefs = &Apache::lonnet::get_domain_defaults($dom_in_use);
+                    my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
+                    my ($offload,$offloadoth);
                     if (ref($domdefs{'offloadnow'}) eq 'HASH') {
-                        my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
                         if ($domdefs{'offloadnow'}{$lonhost}) {
-                            my $newserver = &Apache::lonnet::spareserver(30000,undef,1,$dom_in_use);
-                            if (($newserver) && ($newserver ne $lonhost)) {
-                                my $numsec = 5;
-                                my $timeout = $numsec * 1000;
-                                my ($newurl,$locknum,%locks,$msg);
-                                if ($env{'request.role.adv'}) {
-                                    ($locknum,%locks) = &Apache::lonnet::get_locks();
+                            $offload = 1;
+                            if (($env{'user.domain'} ne '') && ($env{'user.domain'} ne $dom_in_use) &&
+                                (!(($env{'user.name'} eq 'public') && ($env{'user.domain'} eq 'public')))) {
+                                unless (&Apache::lonnet::shared_institution($env{'user.domain'})) {
+                                    $offloadoth = 1;
+                                    $dom_in_use = $env{'user.domain'};
                                 }
-                                my $disable_submit = 0;
-                                if ($requrl =~ /$LONCAPA::assess_re/) {
-                                    $disable_submit = 1;
+                            }
+                        }
+                    }
+                    unless ($offload) {
+                        if (ref($domdefs{'offloadoth'}) eq 'HASH') {
+                            if ($domdefs{'offloadoth'}{$lonhost}) {
+                                if (($env{'user.domain'} ne '') && ($env{'user.domain'} ne $dom_in_use) &&
+                                    (!(($env{'user.name'} eq 'public') && ($env{'user.domain'} eq 'public')))) {
+                                    unless (&Apache::lonnet::shared_institution($env{'user.domain'})) {
+                                        $offload = 1;
+                                        $offloadoth = 1;
+                                        $dom_in_use = $env{'user.domain'};
+                                    }
                                 }
-                                if ($locknum) {
-                                    my @lockinfo = sort(values(%locks));
-                                    $msg = &mt('Once the following tasks are complete: ')."\\n".
-                                           join(", ",sort(values(%locks)))."\\n".
-                                           &mt('your session will be transferred to a different server, after you click "Roles".');
+                            }
+                        }
+                    }
+                    if ($offload) {
+                        my $newserver = &Apache::lonnet::spareserver(undef,30000,undef,1,$dom_in_use);
+                        if (($newserver eq '') && ($offloadoth)) {
+                            my @domains = &Apache::lonnet::current_machine_domains();
+                            if (($dom_in_use ne '') && (!grep(/^\Q$dom_in_use\E$/,@domains))) { 
+                                ($newserver) = &Apache::lonnet::choose_server($dom_in_use);
+                            }
+                        }
+                        if (($newserver) && ($newserver ne $lonhost)) {
+                            my $numsec = 5;
+                            my $timeout = $numsec * 1000;
+                            my ($newurl,$locknum,%locks,$msg);
+                            if ($env{'request.role.adv'}) {
+                                ($locknum,%locks) = &Apache::lonnet::get_locks();
+                            }
+                            my $disable_submit = 0;
+                            if ($requrl =~ /$LONCAPA::assess_re/) {
+                                $disable_submit = 1;
+                            }
+                            if ($locknum) {
+                                my @lockinfo = sort(values(%locks));
+                                $msg = &mt('Once the following tasks are complete:')." \n".
+                                       join(", ",sort(values(%locks)))."\n";
+                                if (&show_course()) {
+                                    $msg .= &mt('your session will be transferred to a different server, after you click "Courses".');
                                 } else {
-                                    if (($requrl =~ m{^/res/}) && ($env{'form.submitted'} =~ /^part_/)) {
-                                        $msg = &mt('Your LON-CAPA submission has been recorded')."\\n";
-                                    }
-                                    $msg .= &mt('Your current LON-CAPA session will be transferred to a different server in [quant,_1,second].',$numsec);
-                                    $newurl = '/adm/switchserver?otherserver='.$newserver;
-                                    if (($env{'request.role'}) && ($env{'request.role'} ne 'cm')) {
-                                        $newurl .= '&role='.$env{'request.role'};
+                                    $msg .= &mt('your session will be transferred to a different server, after you click "Roles".');
+                                }
+                            } else {
+                                if (($requrl =~ m{^/res/}) && ($env{'form.submitted'} =~ /^part_/)) {
+                                    $msg = &mt('Your LON-CAPA submission has been recorded')."\n";
+                                }
+                                $msg .= &mt('Your current LON-CAPA session will be transferred to a different server in [quant,_1,second].',$numsec);
+                                $newurl = '/adm/switchserver?otherserver='.$newserver;
+                                if (($env{'request.role'}) && ($env{'request.role'} ne 'cm')) {
+                                    $newurl .= '&role='.$env{'request.role'};
+                                }
+                                if ($env{'request.symb'}) {
+                                    my $shownsymb = &Apache::lonenc::check_encrypt($env{'request.symb'});
+                                    if ($shownsymb =~ m{^/enc/}) {
+                                        my $reqdmajor = 2;
+                                        my $reqdminor = 11;
+                                        my $reqdsubminor = 3;
+                                        my $newserverrev = &Apache::lonnet::get_server_loncaparev('',$newserver);
+                                        my $remoterev = &Apache::lonnet::get_server_loncaparev(undef,$newserver);
+                                        my ($major,$minor,$subminor) = ($remoterev =~ /^\'?(\d+)\.(\d+)\.(\d+|)[\w.\-]+\'?$/);
+                                        if (($major eq '' && $minor eq '') ||
+                                            (($reqdmajor > $major) || (($reqdmajor == $major) && ($reqdminor > $minor)) ||
+                                            (($reqdmajor == $major) && ($reqdminor == $minor) && (($subminor eq '') ||
+                                             ($reqdsubminor > $subminor))))) {
+                                            undef($shownsymb);
+                                        }
                                     }
-                                    if ($env{'request.symb'}) {
-                                        $newurl .= '&symb='.$env{'request.symb'};
-                                    } else {
-                                        $newurl .= '&origurl='.$requrl;
+                                    if ($shownsymb) {
+                                        &js_escape(\$shownsymb);
+                                        $newurl .= '&symb='.$shownsymb;
                                     }
+                                } else {
+                                    my $shownurl = &Apache::lonenc::check_encrypt($requrl);
+                                    &js_escape(\$shownurl);
+                                    $newurl .= '&origurl='.$shownurl;
                                 }
-                                &js_escape(\$msg);
-                                $result.=<<OFFLOAD
+                            }
+                            &js_escape(\$msg);
+                            $result.=<<OFFLOAD
 <meta http-equiv="pragma" content="no-cache" />
 <script type="text/javascript">
 // <![CDATA[
@@ -7950,7 +8247,6 @@ function LC_Offload_Now() {
 // ]]>
 </script>
 OFFLOAD
-                            }
                         }
                     }
                 }
@@ -8049,7 +8345,8 @@ sub print_suppression {
         }
         my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
         my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
-        my $blocked = &blocking_status('printout',$cnum,$cdom,undef,1);
+        my $clientip = &Apache::lonnet::get_requestor_ip();
+        my $blocked = &blocking_status('printout',$clientip,$cnum,$cdom,undef,1);
         if ($blocked) {
             my $checkrole = "cm./$cdom/$cnum";
             if ($env{'request.course.sec'} ne '') {
@@ -8166,6 +8463,13 @@ $args - additional optional args support
                                     to lonhtmlcommon::breadcrumbs
              group          -> includes the current group, if page is for a
                                specific group
+             use_absolute   -> for request for external resource or syllabus, this
+                               will contain https://<hostname> if server uses
+                               https (as per hosts.tab), but request is for http
+             hostname       -> hostname, originally from $r->hostname(), (optional).
+             links_disabled -> Links in primary and secondary menus are disabled
+                               (Can enable them once page has loaded - see lonroles.pm
+                               for an example).
 
 =back
 
@@ -8367,13 +8671,20 @@ sub modal_link {
         $target_attr = 'target="'.$target.'"';
     }
     return <<"ENDLINK";
-<a href="$link" $target_attr title="$title" onclick="javascript:openMyModal('$link',$width,$height,'$scrolling','$transparency','$style'); return false;">
-           $linktext</a>
+<a href="$link" $target_attr title="$title" onclick="javascript:openMyModal('$link',$width,$height,'$scrolling','$transparency','$style'); return false;">$linktext</a>
 ENDLINK
 }
 
 sub modal_adhoc_script {
-    my ($funcname,$width,$height,$content)=@_;
+    my ($funcname,$width,$height,$content,$possmathjax)=@_;
+    my $mathjax;
+    if ($possmathjax) {
+        $mathjax = <<'ENDJAX';
+               if (typeof MathJax == 'object') {
+                   MathJax.Hub.Queue(["Typeset",MathJax.Hub]);
+               }
+ENDJAX
+    }
     return (<<ENDADHOC);
 <script type="text/javascript">
 // <![CDATA[
@@ -8384,6 +8695,7 @@ sub modal_adhoc_script {
                 modalWindow.height = $height;
                 modalWindow.content = '$content';
                 modalWindow.open();
+                $mathjax
         };  
 // ]]>
 </script>
@@ -8391,7 +8703,7 @@ ENDADHOC
 }
 
 sub modal_adhoc_inner {
-    my ($funcname,$width,$height,$content)=@_;
+    my ($funcname,$width,$height,$content,$possmathjax)=@_;
     my $innerwidth=$width-20;
     $content=&js_ready(
                &start_page('Dialog',undef,{'only_body'=>1,'bgcolor'=>'#FFFFFF'}).
@@ -8400,12 +8712,12 @@ sub modal_adhoc_inner {
                  &end_scrollbox().
                  &end_page()
              );
-    return &modal_adhoc_script($funcname,$width,$height,$content);
+    return &modal_adhoc_script($funcname,$width,$height,$content,$possmathjax);
 }
 
 sub modal_adhoc_window {
-    my ($funcname,$width,$height,$content,$linktext)=@_;
-    return &modal_adhoc_inner($funcname,$width,$height,$content).
+    my ($funcname,$width,$height,$content,$linktext,$possmathjax)=@_;
+    return &modal_adhoc_inner($funcname,$width,$height,$content,$possmathjax).
            "<a href=\"javascript:$funcname();void(0);\">".$linktext."</a>";
 }
 
@@ -8471,8 +8783,9 @@ sub end_togglebox {
 }
 
 sub LCprogressbar_script {
-   my ($id)=@_;
-   return(<<ENDPROGRESS);
+   my ($id,$number_to_do)=@_;
+   if ($number_to_do) {
+       return(<<ENDPROGRESS);
 <script type="text/javascript">
 // <![CDATA[
 \$('#progressbar$id').progressbar({
@@ -8485,21 +8798,43 @@ sub LCprogressbar_script {
 // ]]>
 </script>
 ENDPROGRESS
+   } else {
+       return(<<ENDPROGRESS);
+<script type="text/javascript">
+// <![CDATA[
+\$('#progressbar$id').progressbar({
+  value: false,
+  create: function(event, ui) {
+    \$('.ui-widget-header', this).css({'background':'#F0F0F0'});
+    \$('.ui-progressbar-overlay', this).css({'margin':'0'});
+  }
+});
+// ]]>
+</script>
+ENDPROGRESS
+   }
 }
 
 sub LCprogressbarUpdate_script {
    return(<<ENDPROGRESSUPDATE);
 <style type="text/css">
 .ui-progressbar { position:relative; }
+.progress-label {position: absolute; width: 100%; text-align: center; top: 1px; font-weight: bold; text-shadow: 1px 1px 0 #fff;margin: 0; line-height: 200%; }
 .pblabel { position: absolute; width: 100%; text-align: center; line-height: 1.9em; }
 </style>
 <script type="text/javascript">
 // <![CDATA[
 var LCprogressTxt='---';
 
-function LCupdateProgress(percent,progresstext,id) {
+function LCupdateProgress(percent,progresstext,id,maxnum) {
    LCprogressTxt=progresstext;
-   \$('#progressbar'+id).progressbar('value',percent);
+   if ((maxnum == '') || (maxnum == undefined) || (maxnum == null)) {
+       \$('#progressbar'+id).find('.progress-label').text(LCprogressTxt);
+   } else if (percent === \$('#progressbar'+id).progressbar( "value" )) {
+       \$('#progressbar'+id).find('.pblabel').text(LCprogressTxt);
+   } else {
+       \$('#progressbar'+id).progressbar('value',percent);
+   }
 }
 // ]]>
 </script>
@@ -8511,37 +8846,54 @@ my $LCidcnt;
 my $LCcurrentid;
 
 sub LCprogressbar {
-    my ($r)=(@_);
+    my ($r,$number_to_do,$preamble)=@_;
     $LClastpercent=0;
     $LCidcnt++;
     $LCcurrentid=$$.'_'.$LCidcnt;
-    my $starting=&mt('Starting');
-    my $content=(<<ENDPROGBAR);
+    my ($starting,$content);
+    if ($number_to_do) {
+        $starting=&mt('Starting');
+        $content=(<<ENDPROGBAR);
+$preamble
   <div id="progressbar$LCcurrentid">
     <span class="pblabel">$starting</span>
   </div>
 ENDPROGBAR
-    &r_print($r,$content.&LCprogressbar_script($LCcurrentid));
+    } else {
+        $starting=&mt('Loading...');
+        $LClastpercent='false';
+        $content=(<<ENDPROGBAR);
+$preamble
+  <div id="progressbar$LCcurrentid">
+      <div class="progress-label">$starting</div>
+  </div>
+ENDPROGBAR
+    }
+    &r_print($r,$content.&LCprogressbar_script($LCcurrentid,$number_to_do));
 }
 
 sub LCprogressbarUpdate {
-    my ($r,$val,$text)=@_;
-    unless ($val) { 
-       if ($LClastpercent) {
-           $val=$LClastpercent;
-       } else {
-           $val=0;
-       }
+    my ($r,$val,$text,$number_to_do)=@_;
+    if ($number_to_do) {
+        unless ($val) { 
+            if ($LClastpercent) {
+                $val=$LClastpercent;
+            } else {
+                $val=0;
+            }
+        }
+        if ($val<0) { $val=0; }
+        if ($val>100) { $val=0; }
+        $LClastpercent=$val;
+        unless ($text) { $text=$val.'%'; }
+    } else {
+        $val = 'false';
     }
-    if ($val<0) { $val=0; }
-    if ($val>100) { $val=0; }
-    $LClastpercent=$val;
-    unless ($text) { $text=$val.'%'; }
     $text=&js_ready($text);
     &r_print($r,<<ENDUPDATE);
 <script type="text/javascript">
 // <![CDATA[
-LCupdateProgress($val,'$text','$LCcurrentid');
+LCupdateProgress($val,'$text','$LCcurrentid','$number_to_do');
 // ]]>
 </script>
 ENDUPDATE
@@ -10221,11 +10573,15 @@ sub sorted_inst_types {
 }
 
 sub get_institutional_codes {
-    my ($settings,$allcourses,$LC_code) = @_;
+    my ($cdom,$crs,$settings,$allcourses,$LC_code) = @_;
 # Get complete list of course sections to update
     my @currsections = ();
     my @currxlists = ();
+    my (%unclutteredsec,%unclutteredlcsec);
     my $coursecode = $$settings{'internal.coursecode'};
+    my $crskey = $crs.':'.$coursecode;
+    @{$unclutteredsec{$crskey}} = ();
+    @{$unclutteredlcsec{$crskey}} = ();
 
     if ($$settings{'internal.sectionnums'} ne '') {
         @currsections = split(/,/,$$settings{'internal.sectionnums'});
@@ -10236,8 +10592,8 @@ sub get_institutional_codes {
     }
 
     if (@currxlists > 0) {
-        foreach (@currxlists) {
-            if (m/^([^:]+):(\w*)$/) {
+        foreach my $xl (@currxlists) {
+            if ($xl =~ /^([^:]+):(\w*)$/) {
                 unless (grep/^$1$/,@{$allcourses}) {
                     push(@{$allcourses},$1);
                     $$LC_code{$1} = $2;
@@ -10245,15 +10601,28 @@ sub get_institutional_codes {
             }
         }
     }
- 
+
     if (@currsections > 0) {
-        foreach (@currsections) {
-            if (m/^(\w+):(\w*)$/) {
-                my $sec = $coursecode.$1;
+        foreach my $sec (@currsections) {
+            if ($sec =~ m/^(\w+):(\w*)$/ ) {
+                my $instsec = $1;
                 my $lc_sec = $2;
-                unless (grep/^$sec$/,@{$allcourses}) {
+                unless (grep/^\Q$instsec\E$/,@{$unclutteredsec{$crskey}}) {
+                    push(@{$unclutteredsec{$crskey}},$instsec);
+                    push(@{$unclutteredlcsec{$crskey}},$lc_sec);
+                }
+            }
+        }
+    }
+
+    if (@{$unclutteredsec{$crskey}} > 0) {
+        my %formattedsec = &Apache::lonnet::auto_instsec_reformat($cdom,'clutter',\%unclutteredsec);
+        if ((ref($formattedsec{$crskey}) eq 'ARRAY') && (ref($unclutteredlcsec{$crskey}) eq 'ARRAY')) {
+            for (my $i=0; $i<@{$formattedsec{$crskey}}; $i++) {
+                my $sec = $coursecode.$formattedsec{$crskey}[$i];
+                unless (grep/^\Q$sec\E$/,@{$allcourses}) {
                     push(@{$allcourses},$sec);
-                    $$LC_code{$sec} = $lc_sec;
+                    $$LC_code{$sec} = $unclutteredlcsec{$crskey}[$i];
                 }
             }
         }
@@ -12186,8 +12555,7 @@ sub process_decompression {
                     if (ref($newdirlistref) eq 'ARRAY') {
                         foreach my $dir_line (@{$newdirlistref}) {
                             my ($item,undef,undef,$testdir)=split(/\&/,$dir_line,5);
-                            unless (($item =~ /^\.+$/) || ($item eq $file) || 
-                                    ((@to_skip > 0) && (grep(/^\Q$item\E$/,@to_skip)))) {
+                            unless (($item =~ /^\.+$/) || ($item eq $file)) { 
                                 push(@newitems,$item);
                                 if ($dirptr&$testdir) {
                                     $is_dir{$item} = 1;
@@ -12775,7 +13143,7 @@ sub process_extracted_files {
                             $newseqid{$i} = $newidx;
                             unless ($errtext) {
                                 $result .=  '<li>'.&mt('Folder: [_1] added to course',
-                                                       &HTML::Entities::encode($docstitle,'<>&"')).
+                                                       &HTML::Entities::encode($docstitle,'<>&"'))..
                                             '</li>'."\n";
                             }
                         }
@@ -12800,7 +13168,7 @@ sub process_extracted_files {
                                             $fetch =~ s/^\Q$prefix$dir\E//;
                                             $prompttofetch{$fetch} = 1;
                                         }
-                                    }
+                                   }
                                 }
                                 $LONCAPA::map::resources[$newidx]=
                                     $docstitle.':'.$url.':false:normal:res';
@@ -12900,11 +13268,11 @@ sub process_extracted_files {
                                 $result .= '<li>'.&mt('[_1] included as a dependency',
                                                       &HTML::Entities::encode($showpath,'<>&"')).
                                            '</li>'."\n";
-                            }
-                            unless ($ishome) {
-                                my $fetch = "$fullpath/$title";
-                                $fetch =~ s/^\Q$prefix$dir\E//;
-                                $prompttofetch{$fetch} = 1;
+                                unless ($ishome) {
+                                    my $fetch = "$fullpath/$title";
+                                    $fetch =~ s/^\Q$prefix$dir\E//;
+                                    $prompttofetch{$fetch} = 1;
+                                }
                             }
                         }
                     }
@@ -13191,9 +13559,10 @@ sub upfile_store {
     $env{'form.upfile'}=~s/\n+$//gs;
 
     my $datatoken = &valid_datatoken($env{'user.name'}.'_'.$env{'user.domain'}.
-	                             '_enroll_'.$env{'request.course.id'}.'_'.
+                                     '_enroll_'.$env{'request.course.id'}.'_'.
                                      time.'_'.$$);
     return if ($datatoken eq '');
+
     {
         my $datafile = $r->dir_config('lonDaemons').
                            '/tmp/'.$datatoken.'.tmp';
@@ -14132,7 +14501,6 @@ $requdom domain of requester (if mailing
 
 $reqemail e-mail address of requester (if mailing type is helpdeskmail)
 
-
 Returns: comma separated list of addresses to which to send e-mail.
 
 =back
@@ -14274,7 +14642,6 @@ sub build_recipient_list {
     } elsif ($origmail ne '') {
         $lastresort = $origmail;
     }
-
     if (($mailing eq 'helpdeskmail') && ($lastresort ne '')) {
         unless (grep(/^\Q$defdom\E$/,&Apache::lonnet::current_machine_domains())) {
             my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
@@ -14460,6 +14827,8 @@ jsarray (reference to array of categorie
 subcats (reference to hash of arrays containing all subcategories within each 
          category, -recursive)
 
+maxd (reference to hash used to hold max depth for all top-level categories).
+
 Returns: nothing
 
 Side effects: populates trails and allitems hash references.
@@ -14467,7 +14836,7 @@ Side effects: populates trails and allit
 =cut
 
 sub extract_categories {
-    my ($categories,$cats,$trails,$allitems,$idx,$jsarray,$subcats) = @_;
+    my ($categories,$cats,$trails,$allitems,$idx,$jsarray,$subcats,$maxd) = @_;
     if (ref($categories) eq 'HASH') {
         &gather_categories($categories,$cats,$idx,$jsarray);
         if (ref($cats->[0]) eq 'ARRAY') {
@@ -14493,12 +14862,15 @@ sub extract_categories {
                         if (ref($subcats) eq 'HASH') {
                             push(@{$subcats->{$item}},&escape($category).':'.&escape($name).':1');
                         }
-                        &recurse_categories($cats,2,$category,$trails,$allitems,\@parents,$subcats);
+                        &recurse_categories($cats,2,$category,$trails,$allitems,\@parents,$subcats,$maxd);
                     }
                 } else {
                     if (ref($subcats) eq 'HASH') {
                         $subcats->{$item} = [];
                     }
+                    if (ref($maxd) eq 'HASH') {
+                        $maxd->{$name} = 1;
+                    }
                 }
             }
         }
@@ -14536,13 +14908,13 @@ Side effects: populates trails and allit
 =cut
 
 sub recurse_categories {
-    my ($cats,$depth,$category,$trails,$allitems,$parents,$subcats) = @_;
+    my ($cats,$depth,$category,$trails,$allitems,$parents,$subcats,$maxd) = @_;
     my $shallower = $depth - 1;
     if (ref($cats->[$depth]{$category}) eq 'ARRAY') {
         for (my $k=0; $k<@{$cats->[$depth]{$category}}; $k++) {
             my $name = $cats->[$depth]{$category}[$k];
             my $item = &escape($category).':'.&escape($parents->[-1]).':'.$shallower;
-            my $trailstr = join(' -&gt; ',(@{$parents},$category));
+            my $trailstr = join(' &raquo; ',(@{$parents},$category));
             if ($allitems->{$item} eq '') {
                 push(@{$trails},$trailstr);
                 $allitems->{$item} = scalar(@{$trails})-1;
@@ -14563,16 +14935,21 @@ sub recurse_categories {
                 }
             }
             &recurse_categories($cats,$deeper,$name,$trails,$allitems,$parents,
-                                $subcats);
+                                $subcats,$maxd);
             pop(@{$parents});
         }
     } else {
         my $item = &escape($category).':'.&escape($parents->[-1]).':'.$shallower;
-        my $trailstr = join(' -&gt; ',(@{$parents},$category));
+        my $trailstr = join(' &raquo; ',(@{$parents},$category));
         if ($allitems->{$item} eq '') {
             push(@{$trails},$trailstr);
             $allitems->{$item} = scalar(@{$trails})-1;
         }
+        if (ref($maxd) eq 'HASH') {
+            if ($depth > $maxd->{$parents->[0]}) {
+                $maxd->{$parents->[0]} = $depth;
+            }
+        }
     }
     return;
 }
@@ -14604,8 +14981,8 @@ sub assign_categories_table {
     my ($cathash,$currcat,$type,$disabled) = @_;
     my $output;
     if (ref($cathash) eq 'HASH') {
-        my (@cats,@trails,%allitems,%idx,@jsarray,@path,$maxdepth);
-        &extract_categories($cathash,\@cats,\@trails,\%allitems,\%idx,\@jsarray);
+        my (@cats,@trails,%allitems,%idx,@jsarray,%maxd,@path,$maxdepth);
+        &extract_categories($cathash,\@cats,\@trails,\%allitems,\%idx,\@jsarray,\%maxd);
         $maxdepth = scalar(@cats);
         if (@cats > 0) {
             my $itemcount = 0;
@@ -15142,8 +15519,7 @@ sub construct_course {
                    'plc.users.denied',
                    'hidefromcat',
                    'checkforpriv',
-                   'categories',
-                   'internal.uniquecode'],
+                   'categories'],
                    $$crsudom,$$crsunum);
         if ($args->{'textbook'}) {
             $cenv{'internal.textbook'} = $args->{'textbook'};
@@ -15384,12 +15760,17 @@ sub construct_course {
 # Open all assignments
 #
     if ($args->{'openall'}) {
+       my $opendate = time;
+       if ($args->{'openallfrom'} =~ /^\d+$/) {
+           $opendate = $args->{'openallfrom'};
+       }
        my $storeunder=$$crsudom.'_'.$$crsunum.'.0.opendate';
-       my %storecontent = ($storeunder         => time,
+       my %storecontent = ($storeunder         => $opendate,
                            $storeunder.'.type' => 'date_start');
-       
-       $outcome .= &mt('Opening all assignments').': '.&Apache::lonnet::cput
-                 ('resourcedata',\%storecontent,$$crsudom,$$crsunum).$linefeed;
+       $outcome .= &mt('All assignments open starting [_1]',
+                       &Apache::lonlocal::locallocaltime($opendate)).': '.
+                   &Apache::lonnet::cput
+                       ('resourcedata',\%storecontent,$$crsudom,$$crsunum).$linefeed;
    }
 #
 # Set first page
@@ -15588,6 +15969,24 @@ sub compare_arrays {
     return @difference;
 }
 
+sub lon_status_items {
+    my %defaults = (
+                     E         => 100,
+                     W         => 4,
+                     N         => 1,
+                     U         => 5,
+                     threshold => 200,
+                     sysmail   => 2500,
+                   );
+    my %names = (
+                   E => 'Errors',
+                   W => 'Warnings',
+                   N => 'Notices',
+                   U => 'Unsent',
+                );
+    return (\%defaults,\%names);
+}
+
 # -------------------------------------------------------- Initialize user login
 sub init_user_environment {
     my ($r, $username, $domain, $authhost, $form, $args) = @_;
@@ -15623,7 +16022,23 @@ sub init_user_environment {
 	    opendir(DIR,$lonids);
 	    while ($filename=readdir(DIR)) {
 		if ($filename=~/^$username\_\d+\_$domain\_$authhost\.id$/) {
-		    unlink($lonids.'/'.$filename);
+                    if (tie(my %oldenv,'GDBM_File',"$lonids/$filename",
+                            &GDBM_READER(),0640)) {
+                        my $linkedfile;
+                        if (exists($oldenv{'user.linkedenv'})) {
+                            $linkedfile = $oldenv{'user.linkedenv'};
+                        }
+                        untie(%oldenv);
+                        if (unlink("$lonids/$filename")) {
+                            if ($linkedfile =~ /^[a-f0-9]+_linked$/) {
+                                if (-l "$lonids/$linkedfile.id") {
+                                    unlink("$lonids/$linkedfile.id");
+                                }
+                            }
+                        }
+                    } else {
+                        unlink($lonids.'/'.$filename);
+                    }
 		}
 	    }
 	    closedir(DIR);
@@ -15658,7 +16073,8 @@ sub init_user_environment {
 
     my %userenv = &Apache::lonnet::dump('environment',$domain,$username);
     my ($tmp) = keys(%userenv);
-    if ($tmp =~ /^(con_lost|error|no_such_host)/i) {
+    if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
+    } else {
 	undef(%userenv);
     }
     if (($userenv{'interface'}) && (!$form->{'interface'})) {
@@ -15673,6 +16089,7 @@ sub init_user_environment {
 # --------------------------------------------------------- Write first profile
 
     {
+        my $ip = &Apache::lonnet::get_requestor_ip();
 	my %initial_env = 
 	    ("user.name"          => $username,
 	     "user.domain"        => $domain,
@@ -15691,7 +16108,7 @@ sub init_user_environment {
 	     "request.course.sec" => '',
 	     "request.role"       => 'cm',
 	     "request.role.adv"   => $env{'user.adv'},
-	     "request.host"       => $ENV{'REMOTE_ADDR'},);
+	     "request.host"       => $ip,);
 
         if ($form->{'localpath'}) {
 	    $initial_env{"browser.localpath"}  = $form->{'localpath'};
@@ -16755,10 +17172,10 @@ sub symb_to_docspath {
 }
 
 sub captcha_display {
-    my ($context,$lonhost) = @_;
+    my ($context,$lonhost,$defdom) = @_;
     my ($output,$error);
     my ($captcha,$pubkey,$privkey,$version) =
-        &get_captcha_config($context,$lonhost);
+        &get_captcha_config($context,$lonhost,$defdom);
     if ($captcha eq 'original') {
         $output = &create_captcha();
         unless ($output) {
@@ -16774,9 +17191,9 @@ sub captcha_display {
 }
 
 sub captcha_response {
-    my ($context,$lonhost) = @_;
+    my ($context,$lonhost,$defdom) = @_;
     my ($captcha_chk,$captcha_error);
-    my ($captcha,$pubkey,$privkey,$version) = &get_captcha_config($context,$lonhost);
+    my ($captcha,$pubkey,$privkey,$version) = &get_captcha_config($context,$lonhost,$defdom);
     if ($captcha eq 'original') {
         ($captcha_chk,$captcha_error) = &check_captcha();
     } elsif ($captcha eq 'recaptcha') {
@@ -16788,7 +17205,7 @@ sub captcha_response {
 }
 
 sub get_captcha_config {
-    my ($context,$lonhost) = @_;
+    my ($context,$lonhost,$dom_in_effect) = @_;
     my ($captcha,$pubkey,$privkey,$version,$hashtocheck);
     my $hostname = &Apache::lonnet::hostname($lonhost);
     my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
@@ -16836,6 +17253,27 @@ sub get_captcha_config {
         } elsif ($domconfhash{$serverhomedom.'.login.captcha'} eq 'original') {
             $captcha = 'original';
         }
+    } elsif ($context eq 'passwords') {
+        if ($dom_in_effect) {
+            my %passwdconf = &Apache::lonnet::get_passwdconf($dom_in_effect);
+            if ($passwdconf{'captcha'} eq 'recaptcha') {
+                if (ref($passwdconf{'recaptchakeys'}) eq 'HASH') {
+                    $pubkey = $passwdconf{'recaptchakeys'}{'public'};
+                    $privkey = $passwdconf{'recaptchakeys'}{'private'};
+                }
+                if ($privkey && $pubkey) {
+                    $captcha = 'recaptcha';
+                    $version = $passwdconf{'recaptchaversion'};
+                    if ($version ne '2') {
+                        $version = 1;
+                    }
+                } else {
+                    $captcha = 'original';
+                }
+            } elsif ($passwdconf{'captcha'} ne 'notused') {
+                $captcha = 'original';
+            }
+        }
     }
     return ($captcha,$pubkey,$privkey,$version);
 }
@@ -16853,13 +17291,17 @@ sub create_captcha {
 
         if (-e $Apache::lonnet::perlvar{'lonCaptchaDir'}.'/'.$md5sum.'.png') {
             $output = '<input type="hidden" name="crypt" value="'.$md5sum.'" />'."\n".
+                      '<span class="LC_nobreak">'.
                       &mt('Type in the letters/numbers shown below').'&nbsp;'.
                       '<input type="text" size="5" name="code" value="" autocomplete="off" />'.
-                      '<br />'.
+                      '</span><br />'.
                       '<img src="'.$captcha_params{'www_output_dir'}.'/'.$md5sum.'.png" alt="captcha" />';
             last;
         }
     }
+    if ($output eq '') {
+        &Apache::lonnet::logthis("Failed to create Captcha code after $tries attempts.");
+    }
     return $output;
 }
 
@@ -16898,7 +17340,8 @@ sub check_captcha {
 sub create_recaptcha {
     my ($pubkey,$version) = @_;
     if ($version >= 2) {
-        return '<div class="g-recaptcha" data-sitekey="'.$pubkey.'"></div>';
+        return '<div class="g-recaptcha" data-sitekey="'.$pubkey.'"></div>'.
+               '<div style="padding:0;clear:both;margin:0;border:0"></div>';
     } else {
         my $use_ssl;
         if ($ENV{'SERVER_PORT'} == 443) {
@@ -16916,13 +17359,14 @@ sub create_recaptcha {
 sub check_recaptcha {
     my ($privkey,$version) = @_;
     my $captcha_chk;
+    my $ip = &Apache::lonnet::get_requestor_ip(); 
     if ($version >= 2) {
         my $ua = LWP::UserAgent->new;
         $ua->timeout(10);
         my %info = (
                      secret   => $privkey,
                      response => $env{'form.g-recaptcha-response'},
-                     remoteip => $ENV{'REMOTE_ADDR'},
+                     remoteip => $ip,
                    );
         my $response = $ua->post('https://www.google.com/recaptcha/api/siteverify',\%info);
         if ($response->is_success)  {
@@ -16938,7 +17382,7 @@ sub check_recaptcha {
         my $captcha_result =
             $captcha->check_answer(
                                     $privkey,
-                                    $ENV{'REMOTE_ADDR'},
+                                    $ip,
                                     $env{'form.recaptcha_challenge_field'},
                                     $env{'form.recaptcha_response_field'},
                                   );
@@ -16989,13 +17433,16 @@ sub cleanup_html {
 # $interval indicates how often to check for messages.
 sub critical_redirect {
     my ($interval) = @_;
+    unless (($env{'user.domain'} ne '') && ($env{'user.name'} ne '')) {
+        return ();
+    }
     if ((time-$env{'user.criticalcheck.time'})>$interval) {
         my @what=&Apache::lonnet::dump('critical', $env{'user.domain'},
                                         $env{'user.name'});
         &Apache::lonnet::appenv({'user.criticalcheck.time'=>time});
         my $redirecturl;
         if ($what[0]) {
-            if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
+            if (($what[0] ne 'con_lost') && ($what[0] ne 'no_such_host') && ($what[0]!~/^error\:/)) {
                 $redirecturl='/adm/email?critical=display';
                 my $url=&Apache::lonnet::absolute_url().$redirecturl;
                 return (1, $url);
@@ -17055,6 +17502,159 @@ sub des_decrypt {
     return $plaintext;
 }
 
+sub is_nonframeable {
+    my ($url,$absolute,$hostname,$ip,$nocache) = @_;
+    my ($remprotocol,$remhost) = ($url =~ m{^(https?)\://(([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,})}i);
+    return if (($remprotocol eq '') || ($remhost eq ''));
+
+    $remprotocol = lc($remprotocol);
+    $remhost = lc($remhost);
+    my $remport = 80;
+    if ($remprotocol eq 'https') {
+        $remport = 443;
+    }
+    my ($result,$cached) = &Apache::lonnet::is_cached_new('noiframe',$remhost.':'.$remport);
+    if ($cached) {
+        unless ($nocache) {
+            if ($result) {
+                return 1;
+            } else {
+                return 0;
+            }
+        }
+    }
+    my $uselink;
+    my $request = new HTTP::Request('HEAD',$url);
+    my $ua = LWP::UserAgent->new;
+    $ua->timeout(5);
+    my $response=$ua->request($request);
+    if ($response->is_success()) {
+        my $secpolicy = lc($response->header('content-security-policy'));
+        my $xframeop = lc($response->header('x-frame-options'));
+        $secpolicy =~ s/^\s+|\s+$//g;
+        $xframeop =~ s/^\s+|\s+$//g;
+        if (($secpolicy ne '') || ($xframeop ne '')) {
+            my $remotehost = $remprotocol.'://'.$remhost;
+            my ($origin,$protocol,$port);
+            if ($ENV{'SERVER_PORT'} =~/^\d+$/) {
+                $port = $ENV{'SERVER_PORT'};
+            } else {
+                $port = 80;
+            }
+            if ($absolute eq '') {
+                $protocol = 'http:';
+                if ($port == 443) {
+                    $protocol = 'https:';
+                }
+                $origin = $protocol.'//'.lc($hostname);
+            } else {
+                $origin = lc($absolute);
+                ($protocol,$hostname) = ($absolute =~ m{^(https?:)//([^/]+)$});
+            }
+            if (($secpolicy) && ($secpolicy =~ /\Qframe-ancestors\E([^;]*)(;|$)/)) {
+                my $framepolicy = $1;
+                $framepolicy =~ s/^\s+|\s+$//g;
+                my @policies = split(/\s+/,$framepolicy);
+                if (@policies) {
+                    if (grep(/^\Q'none'\E$/,@policies)) {
+                        $uselink = 1;
+                    } else {
+                        $uselink = 1;
+                        if ((grep(/^\Q*\E$/,@policies)) || (grep(/^\Q$protocol\E$/,@policies)) ||
+                                (($origin ne '') && (grep(/^\Q$origin\E$/,@policies))) ||
+                                (($ip ne '') && (grep(/^\Q$ip\E$/,@policies)))) {
+                            undef($uselink);
+                        }
+                        if ($uselink) {
+                            if (grep(/^\Q'self'\E$/,@policies)) {
+                                if (($origin ne '') && ($remotehost eq $origin)) {
+                                    undef($uselink);
+                                }
+                            }
+                        }
+                        if ($uselink) {
+                            my @possok;
+                            if ($ip ne '') {
+                                push(@possok,$ip);
+                            }
+                            my $hoststr = '';
+                            foreach my $part (reverse(split(/\./,$hostname))) {
+                                if ($hoststr eq '') {
+                                    $hoststr = $part;
+                                } else {
+                                    $hoststr = "$part.$hoststr";
+                                }
+                                if ($hoststr eq $hostname) {
+                                    push(@possok,$hostname);
+                                } else {
+                                    push(@possok,"*.$hoststr");
+                                }
+                            }
+                            if (@possok) {
+                                foreach my $poss (@possok) {
+                                    last if (!$uselink);
+                                    foreach my $policy (@policies) {
+                                        if ($policy =~ m{^(\Q$protocol\E//|)\Q$poss\E(\Q:$port\E|)$}) {
+                                            undef($uselink);
+                                            last;
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            } elsif ($xframeop ne '') {
+                $uselink = 1;
+                my @policies = split(/\s*,\s*/,$xframeop);
+                if (@policies) {
+                    unless (grep(/^deny$/,@policies)) {
+                        if ($origin ne '') {
+                            if (grep(/^sameorigin$/,@policies)) {
+                                if ($remotehost eq $origin) {
+                                    undef($uselink);
+                                }
+                            }
+                            if ($uselink) {
+                                foreach my $policy (@policies) {
+                                    if ($policy =~ /^allow-from\s*(.+)$/) {
+                                        my $allowfrom = $1;
+                                        if (($allowfrom ne '') && ($allowfrom eq $origin)) {
+                                            undef($uselink);
+                                            last;
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    if ($nocache) {
+        if ($cached) {
+            my $devalidate;
+            if ($uselink && !$result) {
+                $devalidate = 1;
+            } elsif (!$uselink && $result) {
+                $devalidate = 1;
+            }
+            if ($devalidate) {
+                &Apache::lonnet::devalidate_cache_new('noiframe',$remhost.':'.$remport);
+            }
+        }
+    } else {
+        if ($uselink) {
+            $result = 1;
+        } else {
+            $result = 0;
+        }
+        &Apache::lonnet::do_cache_new('noiframe',$remhost.':'.$remport,$result,3600);
+    }
+    return $uselink;
+}
+
 1;
 __END__;