--- loncom/interface/lonnavmaps.pm	2015/04/13 16:30:28	1.505
+++ loncom/interface/lonnavmaps.pm	2023/01/20 22:51:11	1.509.2.14.2.7
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Navigate Maps Handler
 #
-# $Id: lonnavmaps.pm,v 1.505 2015/04/13 16:30:28 raeburn Exp $
+# $Id: lonnavmaps.pm,v 1.509.2.14.2.7 2023/01/20 22:51:11 raeburn Exp $
 
 #
 # Copyright Michigan State University Board of Trustees
@@ -342,7 +342,7 @@ user into thinking that if the sequence
 under it; for example, see the "Show Uncompleted Homework" view on the
 B<NAV> screen.
 
-=item * B<suppressNavmaps>: default: false
+=item * B<suppressNavmap>: default: false
 
 If true, will not display Navigate Content resources. 
 
@@ -486,7 +486,7 @@ use Apache::lonlocal;
 use Apache::lonnet;
 use Apache::lonmap;
 
-use POSIX qw (floor strftime);
+use POSIX qw (ceil floor strftime);
 use Time::HiRes qw( gettimeofday tv_interval );
 use LONCAPA;
 use DateTime();
@@ -577,7 +577,11 @@ sub getLinkForResource {
 	    my $anchor;
 	    if ($res->is_page()) {
 		foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; }  }
-		$anchor=&escape($anchor->shown_symb());
+		if ($anchor->encrypted() && !&advancedUser()) {
+		    $anchor='LC_'.$anchor->id();
+		} else {
+		    $anchor=&escape($anchor->shown_symb());
+		}
 		return ($res->link(),$res->shown_symb(),$anchor);
 	    }
             # in case folder was skipped over as "only sequence"
@@ -624,44 +628,55 @@ sub getDescription {
     if ($status == $res->OPEN_LATER) {
         return &mt("Open [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($open,'start'),$res->symb(),'opendate',$part));
     }
+    my $slotinfo;
     if ($res->simpleStatus($part) == $res->OPEN) {
         unless (&Apache::lonnet::allowed('mgr',$env{'request.course.id'})) {
             my ($slot_status,$slot_time,$slot_name)=$res->check_for_slot($part);
+            my $slotmsg;
             if ($slot_status == $res->UNKNOWN) {
-                return &mt('Reservation status unknown');
+                $slotmsg = &mt('Reservation status unknown');
             } elsif ($slot_status == $res->RESERVED) {
-                return &mt('Reserved - ends [_1]',
+                $slotmsg = &mt('Reserved - ends [_1]',
                            timeToHumanString($slot_time,'end'));
             } elsif ($slot_status == $res->RESERVED_LOCATION) {
-                return &mt('Reserved - specific location(s) - ends [_1]',
+                $slotmsg = &mt('Reserved - specific location(s) - ends [_1]',
                            timeToHumanString($slot_time,'end'));
             } elsif ($slot_status == $res->RESERVED_LATER) {
-                return &mt('Reserved - next open [_1]',
+                $slotmsg = &mt('Reserved - next open [_1]',
                            timeToHumanString($slot_time,'start'));
             } elsif ($slot_status == $res->RESERVABLE) {
-                return &mt('Reservable, reservations close [_1]',
+                $slotmsg = &mt('Reservable, reservations close [_1]',
+                           timeToHumanString($slot_time,'end'));
+            } elsif ($slot_status == $res->NEEDS_CHECKIN) {
+                $slotmsg = &mt('Reserved, check-in needed - ends [_1]',
                            timeToHumanString($slot_time,'end'));
             } elsif ($slot_status == $res->RESERVABLE_LATER) {
-                return &mt('Reservable, reservations open [_1]',
+                $slotmsg = &mt('Reservable, reservations open [_1]',
                            timeToHumanString($slot_time,'start'));
             } elsif ($slot_status == $res->NOT_IN_A_SLOT) {
-                return &mt('Reserve a time/place to work');
+                $slotmsg = &mt('Reserve a time/place to work');
             } elsif ($slot_status == $res->NOTRESERVABLE) {
-                return &mt('Reservation not available');
+                $slotmsg = &mt('Reservation not available');
             } elsif ($slot_status == $res->WAITING_FOR_GRADE) {
-                return &mt('Submission in grading queue');
+                $slotmsg = &mt('Submission in grading queue');
+            }
+            if ($slotmsg) {
+                if ($res->is_task() || !$due) {
+                     return $slotmsg;
+                }
+                $slotinfo = ('&nbsp;' x 2).'('.$slotmsg.')';
             }
         }
     }
     if ($status == $res->OPEN) {
         if ($due) {
 	    if ($res->is_practice()) {
-		return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'duedate',$part));
+		return &mt("Closes [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'start'),$res->symb(),'duedate',$part)).$slotinfo;
 	    } else {
-		return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part));
+		return &mt("Due [_1]",&Apache::lonhtmlcommon::direct_parm_link(&timeToHumanString($due,'end'),$res->symb(),'duedate',$part)).$slotinfo;
 	    }
         } else {
-            return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part);
+            return &Apache::lonhtmlcommon::direct_parm_link(&mt("Open, no due date"),$res->symb(),'duedate',$part).$slotinfo;
         }
     }
     if ($status == $res->PAST_DUE_ANSWER_LATER) {
@@ -907,6 +922,9 @@ sub render_resource {
     my $nonLinkedText = ''; # stuff after resource title not in link
 
     my $link = $params->{"resourceLink"};
+    if ($resource->ext()) {
+        $link =~ s/\#.+(\?)/$1/g;
+    }
 
     #  The URL part is not escaped at this point, but the symb is... 
 
@@ -927,8 +945,31 @@ sub render_resource {
     # links to open and close the folder
 
     my $whitespace = $location.'/whitespace_21.gif';
-    my $linkopen = "<img src='$whitespace' alt='' />"."<a href=\"$link\">";
-    my $linkclose = "</a>";
+    my ($nomodal,$linkopen,$linkclose);
+    unless ($resource->is_map() || $params->{'resource_nolink'}) {
+        $linkopen = "<img src='$whitespace' alt='' />";
+        $linkclose = "</a>";
+        if (($params->{'modalLink'}) && (!$resource->is_sequence())) {
+            if ($link =~m{^(?:|/adm/wrapper)/ext/([^#]+)}) {
+                my $exturl = $1;
+                if (($ENV{'SERVER_PORT'} == 443) && ($exturl !~ /^https:/)) {
+                    $nomodal = 1;
+                }
+            } elsif (($link eq "/public/$LONCAPA::match_domain/$LONCAPA::match_courseid/syllabus") &&
+                     ($env{'request.course.id'}) && ($ENV{'SERVER_PORT'} == 443) &&
+                     ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
+                $nomodal = 1;
+            }
+            my $esclink = &js_escape($link);
+            if ($nomodal) {
+                $linkopen .= "<a href=\"#\" onclick=\"javascript:window.open('$esclink','resourcepreview','height=400,width=500,scrollbars=1,resizable=1,menubar=0,location=1'); return false;\" />";
+            } else {
+                $linkopen .= "<a href=\"$link\" onclick=\"javascript:openMyModal('$esclink',600,500,'yes','true'); return false;\">";
+            }
+        } else {
+            $linkopen .= "<a href=\"$link\">";
+        }
+    }
 
     # Default icon: unknown page
     my $icon = "<img class=\"LC_contentImage\" src='$location/unknown.gif' alt='' />";
@@ -956,8 +997,12 @@ sub render_resource {
         if ($it->{CONDITION}) {
             $nowOpen = !$nowOpen;
         }
-	
-	my $folderType = $resource->is_sequence() ? 'folder' : 'page';
+	my $folderType;
+	if (&advancedUser() && $resource->is_missing_map()) {
+	    $folderType = 'none';
+	} else {
+	    $folderType = $resource->is_sequence() ? 'folder' : 'page';
+	}
         my $title=$resource->title;
 		$title=~s/\"/\&qout;/g;
         if (!$params->{'resource_no_folder_link'}) {
@@ -976,16 +1021,21 @@ sub render_resource {
                 '&amp;jump=' .
                 &escape($resource->symb()) . 
                 "&amp;folderManip=1\">";
-
+            $linkclose = '</a>';
         } else {
             # Don't allow users to manipulate folder
             $icon = "navmap.$folderType." . ($nowOpen ? 'closed' : 'open') . '.gif';
             $icon = "<img class=\"LC_space\" src='$whitespace' alt='' />"."<img class=\"LC_contentImage\" src='$location/$icon' alt=\"".($nowOpen ? &mt('Open Folder') : &mt('Close Folder')).' '.$title."\" />";
-
-            $linkopen = "";
-            $linkclose = "";
+            if ($params->{'caller'} eq 'sequence') {
+                $linkopen = "<a href=\"$link\">";
+                $linkclose = '</a>';
+            } else {
+                $linkopen = "";
+                $linkclose = "";
+            }
         }
-        if ((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
+        if (((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) ||
+             (&Apache::lonnet::allowed('cev',$env{'request.course.id'}))) &&
             ($resource->symb=~/\_\_\_[^\_]+\_\_\_uploaded/)) {
             if (!$params->{'map_no_edit_link'}) {
                 my $icon = &Apache::loncommon::lonhttpdurl('/res/adm/pages').'/editmap.png';
@@ -995,10 +1045,33 @@ sub render_resource {
                          '</a>';
             }
         }
-    }
-
-    if ($resource->randomout()) {
-        $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
+        if ($params->{'mapHidden'} || $resource->randomout()) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
+        } elsif ($params->{'mapUnlisted'}) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('unlisted').')</span> ';
+        } elsif ($params->{'mapHiddenDeepLink'} || $resource->deeplinkout()) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('not shown').')</span> ';
+        }
+    } else {
+        if ($resource->randomout()) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('hidden').')</span> ';
+        } elsif ($resource->deeplinkout()) {
+            $nonLinkedText .= ' <span class="LC_warning">('.&mt('not shown').')</span> ';
+        } else {
+            my $deeplink = $resource->deeplink($params->{caller});
+            if ((($deeplink eq 'absent') || ($deeplink eq 'grades')) &&
+                  &advancedUser()) {
+                $nonLinkedText .= ' <span class="LC_warning">('.&mt('unlisted').')</span> ';
+            } elsif (($deeplink) && ($deeplink) ne 'full') {
+                if (&advancedUser()) {
+                    $nonLinkedText .= ' <span class="LC_warning">('.&mt('deep-link access').
+                                      ')</span> ';
+                } else {
+                    $nonLinkedText .= ' <span class="LC_warning">('.&mt('access via external site').
+                                      ')</span> ';
+                }
+            }
+        }
     }
     if (!$resource->condval()) {
         $nonLinkedText .= ' <span class="LC_info">('.&mt('conditionally hidden').')</span> ';
@@ -1048,10 +1121,19 @@ sub render_resource {
     }
 
     if (!$params->{'resource_nolink'} && !$resource->is_sequence() && !$resource->is_empty_sequence) {
-        $result .= "$curMarkerBegin<a href=\"$link\">$title$partLabel</a>$curMarkerEnd$editmapLink$nonLinkedText</td>";
-    } else {
-        $result .= "$curMarkerBegin$linkopen$title$partLabel</a>$curMarkerEnd$editmapLink$nonLinkedText</td>";
+        $linkclose = '</a>';
+        if ($params->{'modalLink'}) {
+            my $esclink = &js_escape($link);
+            if ($nomodal) {
+                $linkopen = "<a href=\"#\" onclick=\"javascript:window.open('$esclink','resourcepreview','height=400,width=500,scrollbars=1,resizable=1,menubar=0,location=1'); return false;\" />";
+            } else {
+                $linkopen = "<a href=\"$link\" onclick=\"javascript:openMyModal('$esclink',600,500,'yes','true'); return false;\">";
+            }
+        } else {
+            $linkopen = "<a href=\"$link\">";
+        }
     }
+    $result .= "$curMarkerBegin$linkopen$title$partLabel$linkclose$curMarkerEnd$editmapLink$nonLinkedText</td>";
 
     return $result;
 }
@@ -1313,15 +1395,49 @@ sub render {
         # an infinite loop
         my $oldFilterFunc = $filterFunc;
         $filterFunc = sub { my $res = shift; return !$res->randomout() && 
+                                ($res->deeplink($args->{'caller'}) ne 'absent') &&
+                                ($res->deeplink($args->{'caller'}) ne 'grades') &&
+                                !$res->deeplinkout() &&
                                 &$oldFilterFunc($res);};
     }
 
     my $condition = 0;
     if ($env{'form.condition'}) {
         $condition = 1;
+    } elsif (($env{'request.deeplink.login'}) && ($env{'request.course.id'}) && (!$userCanSeeHidden)) {
+        if (!defined($navmap)) {
+            $navmap = Apache::lonnavmaps::navmap->new();
+        }
+        if (defined($navmap)) {
+            my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+            my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+            my $symb = &Apache::loncommon::symb_from_tinyurl($env{'request.deeplink.login'},$cnum,$cdom);
+            if ($symb) {
+                my $deeplink;
+                my $res = $navmap->getBySymb($symb);
+                if ($res->is_map()) {
+                    my $mapname = &Apache::lonnet::declutter($res->src());
+                    $mapname = &Apache::lonnet::deversion($mapname);
+                    $deeplink = $navmap->get_mapparam(undef,$mapname,"0.deeplink");
+                } else {
+                    $deeplink = $res->deeplink();
+                }
+                if ($deeplink ne '') {
+                    if ((split(/,/,$deeplink))[1] eq 'hide') {
+                        if ($res->is_map()) {
+                            map { $filterHash->{$_} = 1 if $_ } split(/,/,$res->map_hierarchy());
+                        } else {
+                            my $mapurl = (&Apache::lonnet::decode_symb($symb))[0];
+                            my $map = $navmap->getResourceByUrl($mapurl);
+                            map { $filterHash->{$_} = 1 if $_ } split(/,/,$map->map_hierarchy());
+                        }
+                    }
+                }
+            }
+        }
     }
 
-    if (!$env{'form.folderManip'} && !defined($args->{'iterator'})) {
+    if (!$env{'form.folderManip'} && !defined($args->{'iterator'}) && !$args->{'nocurrloc'}) {
         # Step 1: Check to see if we have a navmap
         if (!defined($navmap)) {
             $navmap = Apache::lonnavmaps::navmap->new();
@@ -1342,10 +1458,11 @@ sub render {
             my $currenturl = $env{'form.postdata'};
             #$currenturl=~s/^http\:\/\///;
             #$currenturl=~s/^[^\/]+//;
-            
-            $here = $jump = &Apache::lonnet::symbread($currenturl);
+            unless ($args->{'caller'} eq 'sequence') { 
+                $here = $jump = &Apache::lonnet::symbread($currenturl);
+            }
 	}
-	if ($here eq '') {
+	if (($here eq '') && ($args->{'caller'} ne 'sequence')) { 
 	    my $last;
 	    if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
                     &GDBM_READER(),0640)) {
@@ -1359,11 +1476,15 @@ sub render {
         my $mapIterator = $navmap->getIterator(undef, undef, undef, 1);
         my $curRes;
         my $found = 0;
+        my $here_is_navmaps = 0;
+        if ($here =~ m{___\d+___adm/navmaps$}) {
+            $here_is_navmaps = 1;
+        }
         
         # We only need to do this if we need to open the maps to show the
         # current position. This will change the counter so we can't count
         # for the jump marker with this loop.
-        while ($here && ($curRes = $mapIterator->next()) && !$found) {
+        while ($here && ($curRes = $mapIterator->next()) && !$found && !$here_is_navmaps) {
             if (ref($curRes) && $curRes->symb() eq $here) {
                 my $mapStack = $mapIterator->getStack();
                 
@@ -1405,10 +1526,13 @@ sub render {
         if ($args->{'iterator_map'}) {
             my $map = $args->{'iterator_map'};
             $map = $navmap->getResourceByUrl($map);
-            my $firstResource = $map->map_start();
-            my $finishResource = $map->map_finish();
-
-            $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
+            if (ref($map)) {
+                my $firstResource = $map->map_start();
+                my $finishResource = $map->map_finish();
+                $args->{'iterator'} = $it = $navmap->getIterator($firstResource, $finishResource, $filterHash, $condition);
+            } else {
+                return;
+            }
         } else {
             $args->{'iterator'} = $it = $navmap->getIterator(undef, undef, $filterHash, $condition,undef,$args->{'include_top_level_map'});
         }
@@ -1477,9 +1601,6 @@ sub render {
 		'&amp;here='.&escape($here);
 	    $text='Open all folders';
         }
-        if ($env{'form.register'}) {
-            $link .= '&amp;register='.$env{'form.register'};
-        }
 	if ($args->{'caller'} eq 'navmapsdisplay') {
             unless ($args->{'notools'}) {
                 &add_linkitem($args->{'linkitems'},'changefolder',
@@ -1503,9 +1624,6 @@ sub render {
 	<input type="hidden" name="navurl" value="$querystr" />
 	<input type="hidden" name="navtime" value="$time" />
 END
-        if ($env{'form.register'}) {
-            $result .= '<input type="hidden" name="register" value="'.$env{'form.register'}.'" />';
-        }
         if ($args->{'sort'} eq 'discussion') { 
 	    my $totdisc = 0;
 	    my $haveDisc = '';
@@ -1526,15 +1644,22 @@ END
 	}
 	$result.='</form>';
     }
-    if (($args->{'caller'} eq 'navmapsdisplay') &&
-        (&Apache::lonnet::allowed('mdc',$env{'request.course.id'}))) {
+    if (($args->{'caller'} eq 'navmapsdisplay') && ($env{'request.course.id'})) {
         my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
         my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
-        if ($env{'course.'.$env{'request.course.id'}.'.url'} eq 
+        if ($env{'course.'.$env{'request.course.id'}.'.url'} eq
             "uploaded/$cdom/$cnum/default.sequence") {
-            &add_linkitem($args->{'linkitems'},'edittoplevel',
-                          "javascript:gocmd('/adm/coursedocs','editdocs');",
-                          'Content Editor');
+            if ((&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) ||
+                (&Apache::lonnet::allowed('cev',$env{'request.course.id'}))) {
+                &add_linkitem($args->{'linkitems'},'edittoplevel',
+                              "javascript:gocmd('/adm/coursedocs','editdocs');",
+                              'Content Editor');
+            }
+            if ($counter) {
+                &add_linkitem($args->{'linkitems'},'printout',
+                              "javascript:gopost('/adm/printout','/adm/navmaps');",
+                              'Prepare a printable document');
+            }
         }
     }
 
@@ -1573,41 +1698,67 @@ END
     $args->{'indentString'} = setDefault($args->{'indentString'}, "<img src='$location' alt='' />");
     $args->{'displayedHereMarker'} = 0;
 
-    # If we're suppressing empty sequences, look for them here. Use DFS for speed,
-    # since structure actually doesn't matter, except what map has what resources.
-    if ($args->{'suppressEmptySequences'}) {
-        my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
-                                                         $it->{FIRST_RESOURCE},
-                                                         $it->{FINISH_RESOURCE},
-                                                         {}, undef, 1);
-        my $depth = 0;
-        $dfsit->next();
-        my $curRes = $dfsit->next();
-        while ($depth > -1) {
-            if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
-            if ($curRes == $dfsit->END_MAP()) { $depth--; }
-
-            if (ref($curRes)) { 
-                # Parallel pre-processing: Do sequences have non-filtered-out children?
-                if ($curRes->is_map()) {
-                    $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
-                    # Sequences themselves do not count as visible children,
-                    # unless those sequences also have visible children.
-                    # This means if a sequence appears, there's a "promise"
-                    # that there's something under it if you open it, somewhere.
-                } else {
-                    # Not a sequence: if it's filtered, ignore it, otherwise
-                    # rise up the stack and mark the sequences as having children
-                    if (&$filterFunc($curRes)) {
-                        for my $sequence (@{$dfsit->getStack()}) {
-                            $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
-                        }
+    # If we're suppressing empty sequences, look for them here.
+    # We also do this even if $args->{'suppressEmptySequences'}
+    # is not true, so we can hide empty sequences for which the
+    # hiddenresource parameter is set to yes (at map level), or
+    # mark as hidden for users who have $userCanSeeHidden.
+    # Use DFS for speed, since structure actually doesn't matter,
+    # except what map has what resources.
+    #
+    # To ensure the "Selected Resources from selected folder in course"
+    # printout generation option will work in sessions launched via a
+    # deep link, the value of $args->{'filterFunc'} included in the
+    # call to lonnavmaps::render() is omitted from the filter function
+    # used with the DFS Iterator when $args->{'caller'} is 'printout'.
+    #
+    # As a result $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} can be
+    # set to 1 for folder(s) which include resources only accessible
+    # for sessions launched via a deep link, when the current session
+    # is of that type.
+
+    my $dfsit = Apache::lonnavmaps::DFSiterator->new($navmap,
+                                                     $it->{FIRST_RESOURCE},
+                                                     $it->{FINISH_RESOURCE},
+                                                     {}, undef, 1);
+
+    my $dfsFilterFunc;
+    if ($args->{'caller'} eq 'printout') {
+        $dfsFilterFunc = sub { my $res = shift; return !$res->randomout() &&
+                              ($res->deeplink($args->{'caller'}) ne 'absent') &&
+                              ($res->deeplink($args->{'caller'}) ne 'grades') &&
+                              !$res->deeplinkout();};
+    } else {
+        $dfsFilterFunc = $filterFunc;
+    }
+    my $depth = 0;
+    $dfsit->next();
+    my $curRes = $dfsit->next();
+    while ($depth > -1) {
+        if ($curRes == $dfsit->BEGIN_MAP()) { $depth++; }
+        if ($curRes == $dfsit->END_MAP()) { $depth--; }
+
+        if (ref($curRes)) {
+            # Parallel pre-processing: Do sequences have non-filtered-out children?
+            if ($curRes->is_map()) {
+                $curRes->{DATA}->{HAS_VISIBLE_CHILDREN} = 0;
+                # Sequences themselves do not count as visible children,
+                # unless those sequences also have visible children.
+                # This means if a sequence appears, there's a "promise"
+                # that there's something under it if you open it, somewhere.
+            } elsif ($curRes->src()) {
+                # Not a sequence: if it's filtered, ignore it, otherwise
+                # rise up the stack and mark the sequences as having children
+                if (&$dfsFilterFunc($curRes)) {
+                    for my $sequence (@{$dfsit->getStack()}) {
+                        next unless ($sequence->is_map());
+                        $sequence->{DATA}->{HAS_VISIBLE_CHILDREN} = 1;
                     }
                 }
             }
-        } continue {
-            $curRes = $dfsit->next();
         }
+    } continue {
+        $curRes = $dfsit->next();
     }
 
     my $displayedJumpMarker = 0;
@@ -1665,6 +1816,28 @@ END
 	undef($args->{'sort'});
     }
 
+    # Determine if page will be served with https in case
+    # it contains a syllabus which uses an external URL
+    # which points at an http site.
+
+    my ($is_ssl,$cdom,$cnum,$hostname);
+    if ($ENV{'SERVER_PORT'} == 443) {
+        $is_ssl = 1;
+        if ($r) {
+            $hostname = $r->hostname();
+        } else {
+            $hostname = $ENV{'SERVER_NAME'};
+        }
+    }
+    if ($env{'request.course.id'}) {
+        $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+        $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+    }
+
+    my $inhibitmenu;
+    if ($args->{'modalLink'}) {
+        $inhibitmenu = '&amp;inhibitmenu=yes';
+    }
 
     while (1) {
 	if ($args->{'sort'}) {
@@ -1700,9 +1873,39 @@ END
         } 
 
         # If this is an empty sequence and we're filtering them, continue on
-        if ($curRes->is_map() && $args->{'suppressEmptySequences'} &&
-            !$curRes->{DATA}->{HAS_VISIBLE_CHILDREN}) {
-            next;
+        $args->{'mapHidden'} = 0;
+        $args->{'mapUnlisted'} = 0;
+        $args->{'mapHiddenDeepLink'} = 0;
+        if (($curRes->is_map()) && (!$curRes->{DATA}->{HAS_VISIBLE_CHILDREN})) {
+            if ($args->{'suppressEmptySequences'}) {
+                next;
+            } else {
+                my $mapname = &Apache::lonnet::declutter($curRes->src());
+                $mapname = &Apache::lonnet::deversion($mapname);
+                if (lc($navmap->get_mapparam(undef,$mapname,"0.hiddenresource")) eq 'yes') {
+                    if ($userCanSeeHidden) {
+                        $args->{'mapHidden'} = 1;
+                    } else {
+                        next;
+                    }
+                } elsif ($curRes->deeplinkout) {
+                    if ($userCanSeeHidden) {
+                        $args->{'mapHiddenDeepLink'} = 1;
+                    } else {
+                        next;
+                    }
+                } else {
+                    my $deeplink = $navmap->get_mapparam(undef,$mapname,"0.deeplink");
+                    my ($state,$others,$listed) = split(/,/,$deeplink);
+                    if (($listed eq 'absent') || ($listed eq 'grades')) {
+                        if ($userCanSeeHidden) {
+                            $args->{'mapUnlisted'} = 1;
+                        } else {
+                            next;
+                        }
+                    }
+                }
+            }
         }
 
         # If we're suppressing navmaps and this is a navmap, continue on
@@ -1763,7 +1966,16 @@ END
 		    $args->{'condensed'} = 1;
 		}
             }
-        } 
+        }
+        # If deep-link parameter is set (and is not set to full) suppress link
+        # unless privileged user, tinyurl used for login resolved to a map, and
+        # the resource is within the map.
+        if ((!$curRes->deeplink($args->{'caller'})) ||
+            ($curRes->deeplink($args->{'caller'}) eq 'full') || &advancedUser()) {
+            $args->{'resource_nolink'} = 0;
+        } else {
+            $args->{'resource_nolink'} = 1;
+        }
             
         # If the multipart problem was condensed, "forget" it was multipart
         if (scalar(@parts) == 1) {
@@ -1786,11 +1998,35 @@ END
 		$stack=$it->getStack();
 	    }
 	    ($src,$symb,$anchor)=getLinkForResource($stack);
+            my $srcHasQuestion = $src =~ /\?/;
+            if ($env{'request.course.id'}) {
+                if (($is_ssl) && ($src =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
+                    ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
+                    unless ((&Apache::lonnet::uses_sts()) || (&Apache::lonnet::waf_allssl($hostname))) {
+                        if ($hostname ne '') {
+                            $src = 'http://'.$hostname.$src;
+                        }
+                        $src .= ($srcHasQuestion? '&amp;' : '?') . 'usehttp=1';
+                        $srcHasQuestion = 1;
+                    }
+                } elsif (($is_ssl) && ($src =~ m{^\Q/adm/wrapper/ext/\E(?!https:)})) {
+                    unless ((&Apache::lonnet::uses_sts()) || (&Apache::lonnet::waf_allssl($hostname))) {
+                        if ($hostname ne '') {
+                            $src = 'http://'.$hostname.$src;
+                        }
+                        $src .= ($srcHasQuestion? '&amp;' : '?') . 'usehttp=1';
+                        $srcHasQuestion = 1;
+                    }
+                }
+            }
 	    if (defined($anchor)) { $anchor='#'.$anchor; }
-	    my $srcHasQuestion = $src =~ /\?/;
-	    $args->{"resourceLink"} = $src.
-		($srcHasQuestion?'&amp;':'?') .
-		'symb=' . &escape($symb).$anchor;
+            if (($args->{'caller'} eq 'sequence') && ($curRes->is_map())) {
+                $args->{"resourceLink"} = $src.($srcHasQuestion?'&amp;':'?') .'navmap=1';
+            } else {
+	        $args->{"resourceLink"} = $src.
+		    ($srcHasQuestion?'&amp;':'?') .
+		    'symb=' . &escape($symb).$inhibitmenu.$anchor;
+            }
 	}
         # Now, we've decided what parts to show. Loop through them and
         # show them.
@@ -1818,7 +2054,7 @@ END
                     $currentJumpDelta) {
                     # Jam the anchor after the <td> tag;
                     # necessary for valid HTML (which Mozilla requires)
-                    $colHTML =~ s/\>/\>\<a name="curloc" \/\>/;
+                    $colHTML =~ s/\>/\>\<a name="curloc" \>\<\/a\>/;
                     $displayedJumpMarker = 1;
                 }
                 $result .= $colHTML . "\n";
@@ -1892,7 +2128,7 @@ sub show_linkitems_toolbar {
             $result .= '<td align="left">'."\n".
                        '<ul id="LC_toolbar">';
             my @linkorder = ('firsthomework','everything','uncompleted',
-                             'changefolder','clearbubbles','edittoplevel');
+                             'changefolder','clearbubbles','printout','edittoplevel');
             foreach my $link (@linkorder) {
                 if (ref($args->{'linkitems'}{$link}) eq 'HASH') {
                     if ($args->{'linkitems'}{$link}{'text'} ne '') {
@@ -2204,7 +2440,7 @@ sub generate_email_discuss_status {
     foreach my $msgid (@keys) {
 	if ((!$emailstatus{$msgid}) || ($emailstatus{$msgid} eq 'new')) {
             my ($sendtime,$shortsubj,$fromname,$fromdomain,$status,$fromcid,
-                $symb,$error) = &Apache::lonmsg::unpackmsgid($msgid);
+                $symb,$error) = &Apache::lonmsg::unpackmsgid(&LONCAPA::escape($msgid));
             &Apache::lonenc::check_decrypt(\$symb); 
             if (($fromcid ne '') && ($fromcid ne $cid)) {
                 next;
@@ -2305,7 +2541,7 @@ sub getIterator {
     my $self = shift;
     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
                                                      shift, undef, shift,
-						     shift, shift);
+						     shift, shift, shift);
     return $iterator;
 }
 
@@ -2701,6 +2937,116 @@ sub parmval_real {
     if (defined($pack_def)) { return [$pack_def,'resource']; }
     return [''];
 }
+
+sub recurseup_maps {
+    my ($self,$mapname) = @_;
+    my @recurseup;
+    if ($mapname) {
+        my $res = $self->getResourceByUrl($mapname);
+        if (ref($res)) {
+            my @pcs = split(/,/,$res->map_hierarchy());
+            shift(@pcs);
+            if (@pcs) {
+                @recurseup = map { &Apache::lonnet::declutter($self->getByMapPc($_)->src()); } reverse(@pcs);
+            }
+        }
+    }
+    return @recurseup;
+}
+
+sub recursed_crumbs {
+    my ($self,$mapurl,$restitle) = @_;
+    my (@revmapinfo,@revmapres);
+    my $mapres = $self->getResourceByUrl($mapurl);
+    if (ref($mapres)) {
+        @revmapres = map { $self->getByMapPc($_); } split(/,/,$mapres->map_breadcrumbs());
+        shift(@revmapres);
+    }
+    my $allowedlength = 60;
+    my $minlength = 5;
+    my $allowedtitle = 30;
+    if (($env{'environment.icons'} eq 'iconsonly') && (!$env{'browser.mobile'})) {
+        $allowedlength = 100;
+        $allowedtitle = 70;
+    }
+    if (length($restitle) > $allowedtitle) {
+        $restitle = &truncate_crumb_text($restitle,$allowedtitle);
+    }
+    my $totallength = length($restitle);
+    my @links;
+
+    foreach my $map (@revmapres) {
+        my $pc = $map->map_pc();
+        next if ((!$pc) || ($pc == 1));
+        push(@links,$map);
+        my $text = $map->title();
+        if ($text eq '') {
+            $text = '...';
+        }
+        push(@revmapinfo,{'href' => $env{'request.use_absolute'}.$map->link().'?navmap=1','text' => $text,'no_mt' => 1,});
+        $totallength += length($text);
+    }
+    my $numlinks = scalar(@links);
+    if ($numlinks) {
+        if ($totallength - $allowedlength > 0) {
+            my $available = $allowedlength - length($restitle);
+            my $avg = POSIX::ceil($available/$numlinks);
+            if ($avg < $minlength) {
+                $avg = $minlength;
+            }
+            @revmapinfo = ();
+            foreach my $map (@links) {
+                my $title = $map->title();
+                if ($title eq '') {
+                    $title = '...';
+                }
+                my $showntitle = &truncate_crumb_text($title,$avg);
+                if ($showntitle ne '') {
+                    push(@revmapinfo,{'href' => $env{'request.use_absolute'}.$map->link().'?navmap=1','text' => $showntitle,'no_mt' => 1,});
+                }
+            }
+        }
+    }
+    if ($restitle ne '') {
+        push(@revmapinfo,{'text' => $restitle, 'no_mt' => 1});
+    }
+    return @revmapinfo;
+}
+
+sub truncate_crumb_text {
+    my ($title,$limit) = @_;
+    my $showntitle = '';
+    if (length($title) > $limit) {
+        my @words = split(/\b\s*/,$title);
+        if (@words == 1) {
+            $showntitle = substr($title,0,$limit).' ...';
+        } else {
+            my $linklength = 0;
+            my $num = 0;
+            foreach my $word (@words) {
+                $linklength += 1+length($word);
+                if ($word eq '-') {
+                    $showntitle =~ s/ $//;
+                    $showntitle .= $word;
+                } elsif ($linklength > $limit) {
+                    if ($num < @words) {
+                        $showntitle .= $word.' ...';
+                        last;
+                    } else {
+                        $showntitle .= $word;
+                    }
+                } else {
+                    $showntitle .= $word.' ';
+                }
+            }
+            $showntitle =~ s/ $//;
+        }
+        return $showntitle;
+    } else {
+        return $title;
+    }
+}
+
 #
 #  Determines the open/close dates for printing a map that
 #  encloses a resource.
@@ -2712,15 +3058,15 @@ sub map_printdates {
 
 
 
-    my $opendate = $self->get_mapparam($res->symb(), "$part.printstartdate");
-    my $closedate= $self->get_mapparam($res->symb(), "$part.printenddate");
+    my $opendate = $self->get_mapparam($res->symb(),'',"$part.printstartdate");
+    my $closedate= $self->get_mapparam($res->symb(),'', "$part.printenddate");
 
 
     return ($opendate, $closedate);
 }
 
 sub get_mapparam {
-    my ($self, $symb, $what) = @_;
+    my ($self, $symb, $mapname, $what) = @_;
 
     # Ensure the course option hash is populated:
 
@@ -2739,15 +3085,17 @@ sub get_mapparam {
     my $uname=$self->{USERNAME};
     my $udom=$self->{DOMAIN};
 
-    unless ($symb) { return ['']; }
+    unless ($symb || $mapname) { return; }
     my $result='';
-
+    my ($recursed,@recurseup);
 
     # Figure out which map we are in.
 
-    my ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
-    $mapname = &Apache::lonnet::deversion($mapname);
-
+    if ($symb && !$mapname) {
+        my ($id,$fn);
+        ($mapname,$id,$fn)=&Apache::lonnet::decode_symb($symb);
+        $mapname = &Apache::lonnet::deversion($mapname);
+    }
 
     my $rwhat=$what;
     $what=~s/^parameter\_//;
@@ -2779,6 +3127,20 @@ sub get_mapparam {
 	if (defined($$useropt{$courselevel})) {
 	    return $$useropt{$courselevel};
 	}
+        if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+            unless ($recursed) {
+                @recurseup = $self->recurseup_maps($mapname);
+                $recursed = 1;
+            }
+            foreach my $item (@recurseup) {
+                my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
+                if (defined($$useropt{$norecursechk})) {
+                    if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                        return $$useropt{$norecursechk};
+                    }
+                }
+            }
+        }
     }
 
     # Check course -- group
@@ -2789,6 +3151,20 @@ sub get_mapparam {
 	if (defined($$courseopt{$grplevel})) {
 	    return $$courseopt{$grplevel};
 	}
+        if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+            unless ($recursed) {
+                @recurseup = $self->recurseup_maps($mapname);
+                $recursed = 1;
+            }
+            foreach my $item (@recurseup) {
+                my $norecursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(all).'.$what;
+                if (defined($$courseopt{$norecursechk})) {
+                    if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                        return $$courseopt{$norecursechk};
+                    }
+                }
+            }
+        }
     }
 
     # Check course -- section
@@ -2801,12 +3177,29 @@ sub get_mapparam {
 	if (defined($$courseopt{$seclevel})) {
 	    return $$courseopt{$seclevel};
 	}
+        if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+            unless ($recursed) {
+                @recurseup = $self->recurseup_maps($mapname);
+                $recursed = 1;
+            }
+            foreach my $item (@recurseup) {
+                my $norecursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(all).'.$what;
+                if (defined($$courseopt{$norecursechk})) {
+                    if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                        return $$courseopt{$norecursechk};
+                    }
+                }
+            }
+        }
     }
     # Check the map parameters themselves:
 
-    my $thisparm = $$parmhash{$symbparm};
-    if (defined($thisparm)) {
-	return $thisparm;
+    if ($symb) {
+        my $symbparm=$symb.'.'.$what;
+        my $thisparm = $$parmhash{$symbparm};
+        if (defined($thisparm)) {
+            return $thisparm;
+        }
     }
 
 
@@ -2816,6 +3209,20 @@ sub get_mapparam {
 	if (defined($$courseopt{$courselevel})) {
 	    return $$courseopt{$courselevel};
 	}
+        if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+            unless ($recursed) {
+                @recurseup = $self->recurseup_maps($mapname);
+                $recursed = 1;
+            }
+            foreach my $item (@recurseup) {
+                my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
+                if (defined($$courseopt{$norecursechk})) {
+                    if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                        return $$courseopt{$norecursechk};
+                    }
+                }
+            }
+        }
     }
     return undef;		# Unefined if we got here.
 }
@@ -2871,7 +3278,7 @@ sub getcourseparam {
     # 
     # We want the course level stuff from the way
     # parmval_real operates 
-    # TODO: Fator some of this stuff out of
+    # TODO: Factor some of this stuff out of
     # both parmval_real and here
     #
     my $courselevel = $cid . '.' .  $what;
@@ -2888,7 +3295,7 @@ sub getcourseparam {
     }
     # Try for the group's course level option:
 
-    if ($uname ne '' and defined($courseopt)) {
+    if ($cgroup ne '' and defined($courseopt)) {
 	if (defined($$courseopt{$grplevel})) {
 	    return $$courseopt{$grplevel};
 	}
@@ -2896,12 +3303,12 @@ sub getcourseparam {
 
     #  Try for section level parameters:
 
-    if ($csec and defined($courseopt)) {
+    if ($csec ne '' and defined($courseopt)) {
 	if (defined($$courseopt{$seclevel})) {
 	    return $$courseopt{$seclevel};
 	}
     }
-    # Try for 'additional' course parameterse:
+    # Try for 'additional' course parameters:
 
     if (defined($courseopt)) {
 	if (defined($$courseopt{$courselevel})) {
@@ -3014,7 +3421,7 @@ sub retrieveResources {
     my $bailout = shift;
     if (!defined($bailout)) { $bailout = 0; }
     my $showall = shift;
-    my $noblockcheck = shift
+    my $noblockcheck = shift;
     # Create the necessary iterator.
     if (!ref($map)) { # assume it's a url of a map.
         $map = $self->getResourceByUrl($map);
@@ -3108,7 +3515,7 @@ getIterator behaves as follows:
 
 =over 4
 
-=item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap):
+=item * B<getIterator>(firstResource, finishResource, filterHash, condition, forceTop, returnTopMap, $deeplinklisted):
 
 All parameters are optional. firstResource is a resource reference
 corresponding to where the iterator should start. It defaults to
@@ -3125,7 +3532,10 @@ that is not just a single, 'redirecting'
 will return all information, starting with the top-level map,
 regardless of content. returnTopMap, if true (default false), will
 cause the iterator to return the top-level map object (resource 0.0)
-before anything else.
+before anything else. deeplinklisted if true (default false), will
+check "listed" status of a resource with a deeplink, and unless "absent"
+will exclude deeplink checking when retrieving the browsePriv from
+lonnet::allowed().
 
 Thus, by default, only top-level resources will be shown. Change the
 condition to a 1 without changing the hash, and all resources will be
@@ -3202,7 +3612,7 @@ call to lonnet::allowed. This needs to b
 was already called from another routine called within lonnet::allowed, 
 so as to prevent recursion.
 
-Also note there is some old code floating around that triess to track
+Also note there is some old code floating around that tries to track
 the depth of the iterator to see when it's done; do not copy that 
 code. It is difficult to get right and harder to understand than
 this. They should be migrated to this new style.
@@ -3262,6 +3672,10 @@ sub new {
     # have we done that yet?
     $self->{HAVE_RETURNED_0} = 0;
 
+    # Do we want to check the "listed" status for a resource for which
+    # deeplinking applies.
+    $self->{DEEPLINKLISTED} = shift;
+
     # Now, we need to pre-process the map, by walking forward and backward
     # over the parts of the map we're going to look at.
 
@@ -3353,7 +3767,8 @@ sub new {
 						 $finishResource, $self->{FILTER},
 						 $self->{ALREADY_SEEN}, 
 						 $self->{CONDITION},
-						 $self->{FORCE_TOP});
+						 $self->{FORCE_TOP},
+                                                 undef,$self->{DEEPLINKLISTED});
     }
 
     # Set up some bookkeeping information.
@@ -3513,7 +3928,8 @@ sub next {
     # That ends the main iterator logic. Now, do we want to recurse
     # down this map (if this resource is a map)?
     if ( ($self->{HERE}->is_sequence() || (!$closeAllPages && $self->{HERE}->is_page())) &&
-        (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) {
+        (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION}) &&
+        ($env{'request.role.adv'} || !$self->{HERE}->randomout())) {
         $self->{RECURSIVE_ITERATOR_FLAG} = 1;
         my $firstResource = $self->{HERE}->map_start();
         my $finishResource = $self->{HERE}->map_finish();
@@ -3522,13 +3938,14 @@ sub next {
                                               $finishResource, $self->{FILTER},
                                               $self->{ALREADY_SEEN},
 					      $self->{CONDITION},
-					      $self->{FORCE_TOP});
+					      $self->{FORCE_TOP},
+                                              undef,$self->{DEEPLINKLISTED});
     }
 
     # If this is a blank resource, don't actually return it.
     # Should you ever find you need it, make sure to add an option to the code
     #  that you can use; other things depend on this behavior.
-    my $browsePriv = $self->{HERE}->browsePriv($noblockcheck);
+    my $browsePriv = $self->{HERE}->browsePriv($noblockcheck,$self->{DEEPLINKLISTED});
     if (!$self->{HERE}->src() || 
         (!($browsePriv eq 'F') && !($browsePriv eq '2')) ) {
         return $self->next($closeAllPages);
@@ -3860,9 +4277,12 @@ sub new {
     # about this resource in. Not used by the resource object
     # directly.
     $self->{DATA} = {};
-   
+    
     bless($self);
     
+    # This is a speed optimization, to avoid calling symb() too often.
+    $self->{SYMB} = $self->symb();
+   
     return $self;
 }
 
@@ -3953,6 +4373,7 @@ sub from { my $self=shift; return $self-
 sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
 sub kind { my $self=shift; return $self->navHash("kind_", 1); }
 sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
+sub deeplinkout { my $self=shift; return $self->navHash("deeplinkout_", 1); }
 sub randompick { 
     my $self = shift;
     my $randompick = $self->parmval('randompick');
@@ -3974,8 +4395,8 @@ sub src {
 }
 sub shown_symb {
     my $self=shift;
-    if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->symb());}
-    return $self->symb();
+    if ($self->encrypted()) {return &Apache::lonenc::encrypted($self->{SYMB});}
+    return $self->{SYMB};
 }
 sub id {
     my $self=shift;
@@ -3988,6 +4409,7 @@ sub enclosing_map_src {
 }
 sub symb {
     my $self=shift;
+    if (defined($self->{SYMB})) { return $self->{SYMB}; }
     (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/;
     my $symbSrc = &Apache::lonnet::declutter($self->src());
     my $symb = &Apache::lonnet::declutter($self->navHash('map_id_'.$first)) 
@@ -3996,7 +4418,7 @@ sub symb {
 }
 sub wrap_symb {
     my $self = shift;
-    return $self->{NAV_MAP}->wrap_symb($self->symb());
+    return $self->{NAV_MAP}->wrap_symb($self->{SYMB});
 }
 sub title { 
     my $self=shift; 
@@ -4178,6 +4600,11 @@ sub is_sequence {
     return $self->navHash("is_map_", 1) && 
     $self->navHash("map_type_" . $self->map_pc()) eq 'sequence';
 }
+sub is_missing_map {
+    my $self=shift;
+    return $self->navHash("is_map_", 1) &&
+    $self->navHash("map_type_" . $self->map_pc()) eq 'none';
+}
 sub is_survey {
     my $self = shift();
     my $part = shift();
@@ -4207,7 +4634,6 @@ sub is_task {
 
 sub is_empty_sequence {
     my $self=shift;
-    my $src = $self->src();
     return !$self->is_page() && $self->navHash("is_map_", 1) && !$self->navHash("map_type_" . $self->map_pc());
 }
 
@@ -4219,7 +4645,7 @@ sub parmval {
     if (!defined($part)) { 
         $part = '0'; 
     }
-    return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
+    return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->{SYMB});
 }
 
 =pod
@@ -4258,6 +4684,12 @@ Returns a string with a comma-separated
 for the hierarchy of maps containing a map, with the top level
 map first, then descending to deeper levels, with the enclosing map last.
 
+=item * B<map_breadcrumbs>:
+
+Same as map_hierarchy, except maps containing only a single itemm if
+it's a map, or containing no items are omitted, unless it's the top
+level map (map_pc = 1), which is always included.
+
 =back
 
 =cut
@@ -4293,6 +4725,11 @@ sub map_hierarchy {
     my $pc = $self->map_pc();
     return $self->navHash("map_hierarchy_$pc", 0);
 }
+sub map_breadcrumbs {
+    my $self = shift;
+    my $pc = $self->map_pc();
+    return $self->navHash("map_breadcrumbs_$pc", 0);
+}
 
 #####
 # Property queries
@@ -4472,25 +4909,25 @@ sub awarded {
     my $self = shift; my $part = shift;
     $self->{NAV_MAP}->get_user_data();
     if (!defined($part)) { $part = '0'; }
-    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.awarded'};
+    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.awarded'};
 }
 sub taskversion {
     my $self = shift; my $part = shift;
     $self->{NAV_MAP}->get_user_data();
     if (!defined($part)) { $part = '0'; }
-    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.version'};
+    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.version'};
 }
 sub taskstatus {
     my $self = shift; my $part = shift;
     $self->{NAV_MAP}->get_user_data();
     if (!defined($part)) { $part = '0'; }
-    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
+    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$self->taskversion($part).'.'.$part.'.status'};
 }
 sub solved {
     my $self = shift; my $part = shift;
     $self->{NAV_MAP}->get_user_data();
     if (!defined($part)) { $part = '0'; }
-    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.solved'};
+    return $self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.solved'};
 }
 sub checkedin {
     my $self = shift; my $part = shift;
@@ -4498,9 +4935,9 @@ sub checkedin {
     if (!defined($part)) { $part = '0'; }
     if ($self->is_task()) {
         my $version = $self->taskversion($part);
-        return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
+        return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$version .'.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$version .'.'.$part.'.checkedin.slot'});
     } else {
-        return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->symb()}->{'resource.'.$part.'.checkedin.slot'});
+        return ($self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.checkedin'},$self->{NAV_MAP}->{STUDENT_DATA}->{$self->{SYMB}}->{'resource.'.$part.'.checkedin.slot'});
     }
 }
 # this should work exactly like the copy in lonhomework.pm
@@ -4517,11 +4954,12 @@ sub duedate {
     my $date;
     my @interval=$self->parmval("interval", $part);
     my $due_date=$self->parmval("duedate", $part);
-    if ($interval[0] =~ /\d+/) {
-       my $first_access=&Apache::lonnet::get_first_access($interval[1],
-                                                          $self->symb);
+    if ($interval[0] =~ /(\d+)/) {
+        my $timelimit = $1;
+        my $first_access=&Apache::lonnet::get_first_access($interval[1],
+                                                          $self->{SYMB});
 	if (defined($first_access)) {
-           my $interval = $first_access+$interval[0];
+            my $interval = $first_access+$timelimit;
 	    $date = (!$due_date || $interval < $due_date) ? $interval 
                                                           : $due_date;
 	} else {
@@ -4592,7 +5030,7 @@ sub weight {
     my $self = shift; my $part = shift;
     if (!defined($part)) { $part = '0'; }
     my $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
-                                $self->symb(), $self->{DOMAIN},
+                                $self->{SYMB}, $self->{DOMAIN},
                                 $self->{USERNAME},
                                 $env{'request.course.sec'});
     return $weight;
@@ -4601,7 +5039,7 @@ sub part_display {
     my $self= shift(); my $partID = shift();
     if (! defined($partID)) { $partID = '0'; }
     my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',
-                                     $self->symb);
+                                     $self->{SYMB});
     if (! defined($display) || $display eq '') {
         $display = $partID;
     }
@@ -4615,13 +5053,53 @@ sub slot_control {
     my $available = $self->parmval("available", $part); 
     return ($useslots,$availablestudent,$available);
 }
+sub deeplink {
+    my ($self,$caller,$action) = @_;
+    my $deeplink = $self->parmval("deeplink");
+    if ($deeplink) {
+        my ($state,$others,$listed,$scope) = split(/,/,$deeplink);
+        if ($action eq 'getlisted') {
+            return $listed;
+        }
+        if ($env{'request.deeplink.login'}) {
+            my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+            my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+            my $deeplink_symb = &Apache::loncommon::deeplink_login_symb($cnum,$cdom);
+            if ($deeplink_symb) {
+                my ($loginmap,$mapname);
+                if ($deeplink_symb =~ /\.(page|sequence)$/) {
+                    $mapname = $self->enclosing_map_src();
+                    $loginmap = &Apache::lonnet::clutter((&Apache::lonnet::decode_symb($deeplink_symb))[2]);
+                    return if ($mapname eq $loginmap);
+                } else {
+                    return if ($deeplink_symb eq $self->symb());
+                    if (($scope eq 'map') || ($scope eq 'rec')) {
+                        $mapname = $self->enclosing_map_src();
+                        $loginmap = &Apache::lonnet::clutter((&Apache::lonnet::decode_symb($deeplink_symb))[0]);
+                        return if ($mapname eq $loginmap);
+                    }
+                }
+                if ($scope eq 'rec') {
+                    my $map_pc = $self->navHash('map_pc_'.$mapname);
+                    my @recurseup = split(/,/,$self->navHash('map_hierarchy_'.$map_pc));
+                    my $login_pc = $self->navHash('map_pc_'.$loginmap);
+                    return if (grep(/^\Q$login_pc\E$/,@recurseup));
+                }
+            }
+        }
+        unless (($caller eq 'sequence') || ($state eq 'both')) {
+            return $listed;
+        }
+    }
+    return;
+}
 
 # Multiple things need this
 sub getReturnHash {
     my $self = shift;
     
     if (!defined($self->{RETURN_HASH})) {
-        my %tmpHash  = &Apache::lonnet::restore($self->symb(),undef,$self->{DOMAIN},$self->{USERNAME});
+        my %tmpHash  = &Apache::lonnet::restore($self->{SYMB},undef,$self->{DOMAIN},$self->{USERNAME});
         $self->{RETURN_HASH} = \%tmpHash;
     }
 }       
@@ -4686,23 +5164,23 @@ and use the link as appropriate.
 
 sub hasDiscussion {
     my $self = shift;
-    return $self->{NAV_MAP}->hasDiscussion($self->symb());
+    return $self->{NAV_MAP}->hasDiscussion($self->{SYMB});
 }
 
 sub last_post_time {
     my $self = shift;
-    return $self->{NAV_MAP}->last_post_time($self->symb());
+    return $self->{NAV_MAP}->last_post_time($self->{SYMB});
 }
 
 sub discussion_info {
     my ($self,$filter) = @_;
-    return $self->{NAV_MAP}->discussion_info($self->symb(),$filter);
+    return $self->{NAV_MAP}->discussion_info($self->{SYMB},$filter);
 }
 
 sub getFeedback {
     my $self = shift;
     my $source = $self->src();
-    my $symb = $self->symb();
+    my $symb = $self->{SYMB};
     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
     return $self->{NAV_MAP}->getFeedback($symb,$source);
 }
@@ -4710,7 +5188,7 @@ sub getFeedback {
 sub getErrors {
     my $self = shift;
     my $source = $self->src();
-    my $symb = $self->symb();
+    my $symb = $self->{SYMB};
     if ($source =~ /^\/res\//) { $source = substr $source, 5; }
     return $self->{NAV_MAP}->getErrors($symb,$source);
 }
@@ -4860,7 +5338,7 @@ sub extractParts {
 	if ($partorder) {
 	    my @parts;
 	    for my $part (split (/,/,$partorder)) {
-		if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
+		if (!Apache::loncommon::check_if_partid_hidden($part, $self->{SYMB})) {
 		    push @parts, $part;
 		    $parts{$part} = 1;
 		}
@@ -4878,12 +5356,12 @@ sub extractParts {
 		    my $part = $1;
 		    # This floods the logs if it blows up
 		    if (defined($parts{$part})) {
-			&Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->symb());
+			&Apache::lonnet::logthis("$part multiply defined in metadata for " . $self->{SYMB});
 		    }
 		    
 		    # check to see if part is turned off.
 		    
-		    if (!Apache::loncommon::check_if_partid_hidden($part, $self->symb())) {
+		    if (!Apache::loncommon::check_if_partid_hidden($part, $self->{SYMB})) {
 			$parts{$part} = 1;
 		    }
 		}
@@ -5388,7 +5866,7 @@ sub status {
 sub check_for_slot {
     my $self = shift;
     my $part = shift;
-    my $symb = $self->symb();
+    my $symb = $self->{SYMB};
     my ($use_slots,$available,$availablestudent) = $self->slot_control($part);
     if (($use_slots ne '') && ($use_slots !~ /^\s*no\s*$/i)) {
         my @slots = (split(/:/,$availablestudent),split(/:/,$available));
@@ -5397,13 +5875,13 @@ sub check_for_slot {
         my $cnum=$env{'course.'.$cid.'.num'};
         my $now = time;
         my $num_usable_slots = 0;
+        my ($checkedin,$checkedinslot,%consumed_uniq,%slots);
         if (@slots > 0) {
-            my %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
+            %slots=&Apache::lonnet::get('slots',[@slots],$cdom,$cnum);
             if (&Apache::lonnet::error(%slots)) {
                 return (UNKNOWN);
             }
             my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots,'starttime');
-            my ($checkedin,$checkedinslot);
             foreach my $slot_name (@sorted_slots) {
                 next if (!defined($slots{$slot_name}) || !ref($slots{$slot_name}));
                 my $end = $slots{$slot_name}->{'endtime'};
@@ -5427,7 +5905,7 @@ sub check_for_slot {
                                 ($checkedin,$checkedinslot) = $self->checkedin();
                                 unless ((grep(/^\Q$checkedin\E/,@proctors)) &&
                                         ($checkedinslot eq $slot_name)) {
-                                    return (NEEDS_CHECKIN,undef,$slot_name); 
+                                    return (NEEDS_CHECKIN,$end,$slot_name); 
                                 }
                             }
                             return (RESERVED,$end,$slot_name);
@@ -5437,19 +5915,30 @@ sub check_for_slot {
                     $num_usable_slots ++;
                 }
             }
-            my ($is_correct,$got_grade);
+            my ($is_correct,$wait_for_grade);
             if ($self->is_task()) {
                 my $taskstatus = $self->taskstatus();
                 $is_correct = (($taskstatus eq 'pass') || 
                                ($self->solved() =~ /^correct_/));
-                $got_grade = ($taskstatus =~ /^(?:pass|fail)$/);
+                unless ($taskstatus =~ /^(?:pass|fail)$/) {
+                    $wait_for_grade = 1;
+                }
             } else {
-                $got_grade = 1;
-                $is_correct = ($self->solved() =~ /^correct_/);   
+                unless ($self->completable()) {
+                    $wait_for_grade = 1;
+                }
+                unless (($self->problemstatus($part) eq 'no') ||
+                        ($self->problemstatus($part) eq 'no_feedback_ever')) {
+                    $is_correct = ($self->solved($part) =~ /^correct_/);
+                    $wait_for_grade = 0;
+                }
             }
             ($checkedin,$checkedinslot) = $self->checkedin();
             if ($checkedin) {
-                if (!$got_grade) {
+                if (ref($slots{$checkedinslot}) eq 'HASH') {
+                    $consumed_uniq{$checkedinslot} = $slots{$checkedinslot}{'uniqueperiod'};
+                }
+                if ($wait_for_grade) {
                     return (WAITING_FOR_GRADE);
                 } elsif ($is_correct) {
                     return (CORRECT); 
@@ -5464,16 +5953,46 @@ sub check_for_slot {
         if (ref($reservable) eq 'HASH') {
             if ((ref($reservable->{'now_order'}) eq 'ARRAY') && (ref($reservable->{'now'}) eq 'HASH')) {
                 foreach my $slot (reverse (@{$reservable->{'now_order'}})) {
+                    my $canuse;
                     if (($reservable->{'now'}{$slot}{'symb'} eq '') ||
                         ($reservable->{'now'}{$slot}{'symb'} eq $symb)) {
+                        $canuse = 1;
+                    }
+                    if ($canuse) {
+                        if ($checkedin) {
+                            if (ref($consumed_uniq{$checkedinslot}) eq 'ARRAY') {
+                                my ($uniqstart,$uniqend)=@{$consumed_uniq{$checkedinslot}};
+                                if ($reservable->{'now'}{$slot}{'uniqueperiod'} =~ /^(\d+),(\d+)$/) {
+                                    my ($new_uniq_start,$new_uniq_end) = ($1,$2);
+                                    next if (!
+                                        ($uniqstart < $new_uniq_start && $uniqend < $new_uniq_start) ||
+                                        ($uniqstart > $new_uniq_end   &&  $uniqend > $new_uniq_end  ));
+                                }
+                            }
+                        }
                         return(RESERVABLE,$reservable->{'now'}{$slot}{'endreserve'});
                     }
                 }
             }
             if ((ref($reservable->{'future_order'}) eq 'ARRAY') && (ref($reservable->{'future'}) eq 'HASH')) {
                 foreach my $slot (@{$reservable->{'future_order'}}) {
+                    my $canuse;
                     if (($reservable->{'future'}{$slot}{'symb'} eq '') ||
                         ($reservable->{'future'}{$slot}{'symb'} eq $symb)) {
+                        $canuse = 1;
+                    }
+                    if ($canuse) {
+                        if ($checkedin) {
+                            if (ref($consumed_uniq{$checkedinslot}) eq 'ARRAY') {
+                                my ($uniqstart,$uniqend)=@{$consumed_uniq{$checkedinslot}};
+                                if ($reservable->{'future'}{$slot}{'uniqueperiod'} =~ /^(\d+),(\d+)$/) {
+                                    my ($new_uniq_start,$new_uniq_end) = ($1,$2);
+                                    next if (!
+                                        ($uniqstart < $new_uniq_start && $uniqend < $new_uniq_start) ||
+                                        ($uniqstart > $new_uniq_end   &&  $uniqend > $new_uniq_end  ));
+                                }
+                            }
+                        }
                         return(RESERVABLE_LATER,$reservable->{'future'}{$slot}{'startreserve'});
                     }
                 }
@@ -5624,6 +6143,39 @@ sub completable {
 
 =pod
 
+B<Answerable>
+
+The answerable method differs from the completable method in its handling of problem parts
+for which feedback on correctness is suppressed, but the student still has tries left, and
+the problem part is not past due, (i.e., the student could submit a different answer if
+he/she so chose). For that case completable will return 0, whereas answerable will return 1.
+
+=cut
+
+sub answerable {
+    my $self = shift;
+    if (!$self->is_problem()) { return 0; }
+    my $partCount = $self->countParts();
+    foreach my $part (@{$self->parts()}) {
+        if ($part eq '0' && $partCount != 1) { next; }
+        my $status = $self->status($part);
+        if ($self->getCompletionStatus($part) == ATTEMPTED() ||
+            $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
+            $status == ANSWER_SUBMITTED() ) {
+            if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
+                return 1;
+            }
+        }
+        if ($status == OPEN() || $status == TRIES_LEFT() || $status == NETWORK_FAILURE()) {
+            return 1;
+        }
+    }
+    # None of the parts were answerable, so neither is this problem.
+    return 0;
+}
+
+=pod
+
 =head2 Resource/Nav Map Navigation
 
 =over 4
@@ -5672,13 +6224,23 @@ sub getPrevious {
 sub browsePriv {
     my $self = shift;
     my $noblockcheck = shift;
+    my $deeplinklisted = shift;
     if (defined($self->{BROWSE_PRIV})) {
         return $self->{BROWSE_PRIV};
     }
-
+    my ($nodeeplinkcheck,$nodeeplinkout);
+    if ($deeplinklisted) {
+        my $deeplink = $self->deeplink(undef,'getlisted');
+        if (($deeplink) && ($deeplink ne 'absent')) {
+            $nodeeplinkcheck = 1;
+        }
+        $nodeeplinkout = 1;
+    }
     $self->{BROWSE_PRIV} = &Apache::lonnet::allowed('bre',$self->src(),
-						    $self->symb(),undef,
-                                                    undef,$noblockcheck);
+						    $self->{SYMB},undef,
+                                                    undef,$noblockcheck,
+                                                    undef,$nodeeplinkcheck,
+                                                    $nodeeplinkout);
 }
 
 =pod