--- loncom/interface/lonnavmaps.pm	2019/02/07 00:49:53	1.509.2.10
+++ loncom/interface/lonnavmaps.pm	2019/07/27 16:44:31	1.509.2.11
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Navigate Maps Handler
 #
-# $Id: lonnavmaps.pm,v 1.509.2.10 2019/02/07 00:49:53 raeburn Exp $
+# $Id: lonnavmaps.pm,v 1.509.2.11 2019/07/27 16:44:31 raeburn Exp $
 
 #
 # Copyright Michigan State University Board of Trustees
@@ -1726,6 +1726,23 @@ 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'}) {
@@ -1864,7 +1881,27 @@ END
 		$stack=$it->getStack();
 	    }
 	    ($src,$symb,$anchor)=getLinkForResource($stack);
-	    my $srcHasQuestion = $src =~ /\?/;
+            my $srcHasQuestion = $src =~ /\?/;
+            if ($env{'request.course.id'}) {
+                if (($is_ssl) && ($src =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
+                    ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
+                    unless (&Apache::lonnet::uses_sts()) {
+                        if ($hostname ne '') {
+                            $src = 'http://'.$hostname.$src;
+                        }
+                        $src .= ($srcHasQuestion? '&' : '?') . 'usehttp=1';
+                        $srcHasQuestion = 1;
+                    }
+                } elsif (($is_ssl) && ($src =~ m{^\Q/adm/wrapper/ext/\E(?!https:)})) {
+                    unless (&Apache::lonnet::uses_sts()) {
+                        if ($hostname ne '') {
+                            $src = 'http://'.$hostname.$src;
+                        }
+                        $src .= ($srcHasQuestion? '&' : '?') . 'usehttp=1';
+                        $srcHasQuestion = 1;
+                    }
+                }
+            }
 	    if (defined($anchor)) { $anchor='#'.$anchor; }
             if (($args->{'caller'} eq 'sequence') && ($curRes->is_map())) {
                 $args->{"resourceLink"} = $src.($srcHasQuestion?'&':'?') .'navmap=1';
@@ -2825,7 +2862,7 @@ sub recursed_crumbs {
         my $pc = $map->map_pc();
         next if ((!$pc) || ($pc == 1));
         push(@links,$map);
-        push(@revmapinfo,{'href' => $map->link().'?navmap=1','text' => $map->title(),'no_mt' => 1,});
+        push(@revmapinfo,{'href' => $env{'request.use_absolute'}.$map->link().'?navmap=1','text' => $map->title(),'no_mt' => 1,});
         $totallength += length($map->title());
     }
     my $numlinks = scalar(@links);
@@ -2840,7 +2877,7 @@ sub recursed_crumbs {
             foreach my $map (@links) {
                 my $showntitle = &truncate_crumb_text($map->title(),$avg);
                 if ($showntitle ne '') {
-                    push(@revmapinfo,{'href' => $map->link().'?navmap=1','text' => $showntitle,'no_mt' => 1,});
+                    push(@revmapinfo,{'href' => $env{'request.use_absolute'}.$map->link().'?navmap=1','text' => $showntitle,'no_mt' => 1,});
                 }
             }
         }