--- rat/lonpage.pm	2020/03/12 07:46:14	1.111.2.12
+++ rat/lonpage.pm	2020/11/11 21:52:05	1.111.2.13
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Page Handler
 #
-# $Id: lonpage.pm,v 1.111.2.12 2020/03/12 07:46:14 raeburn Exp $
+# $Id: lonpage.pm,v 1.111.2.13 2020/11/11 21:52:05 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -246,6 +246,8 @@ sub handler {
                   my %ssilink=();
                   my %ssivlink=();
                   my %ssialink=();
+                  my %cssrefs=();
+                  my %httpref=();
      
                   my %cellemb=();
                   my %cellexternal=();
@@ -401,6 +403,7 @@ ENDEXT
                               my $bodydef=0;
                               my $thisxml=0;
                               my @rlinks=();
+                              my @css_hrefs=();
                               if ($output=~/\?xml/) {
                                  $isxml=1;
                                  $thisxml=1;
@@ -443,6 +446,14 @@ ENDEXT
                                            ($bodydef==0)) {
 				      $allscript.="\n\n"
                                                 .$parser->get_text('/script');
+                                  } elsif (($token->[1] eq 'link') &&
+                                           ($bodydef==0)) {
+                                      if (($token->[2]->{'href'} !~ m{^/adm/}) &&
+                                          ($token->[2]->{'rel'} eq 'stylesheet')) {
+                                              $css_hrefs[$#css_hrefs+1]=
+                                                  $token->[2]->{'href'};
+
+                                      }
                                   }
 			        }
 			      }
@@ -564,6 +575,28 @@ ENDEXT
                      $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
 				  }
 			      }
+                              foreach my $css_href (@css_hrefs) {
+                                  next if ($css_href eq '');
+                                  unless ($css_href =~ m{https?://}) {
+                                      my $proburl = &Apache::lonnet::clutter($plainsrc);
+                                      unless ($css_href =~ m{^/}) {
+                                          my $probdir = $proburl;
+                                          $probdir=~s/\/[^\/]*$//;
+                                          $css_href = &Apache::lonnet::hreflocation($probdir,$css_href);
+                                      }
+                                      if ($css_href =~ m{^/(res|uploaded)/}) {
+                                          unless (($env{'httpref.'.$css_href}) ||
+                                                  ($httpref{'httpref.'.$css_href}) ||
+                                                  (&Apache::lonnet::is_on_map($css_href))) {
+                                              if ($env{'httpref.'.$proburl}) {
+                                                  $proburl = $env{'httpref.'.$proburl};
+                                              }
+                                              $httpref{'httpref.'.$css_href} = $proburl;
+                                          }
+                                      }
+                                  }
+                                  $cssrefs{$css_href} = 1;
+                              }
 # -------------------------------------------------- Deal with Applet codebases
   $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
 			      $ssibody{$_}=$output;
@@ -663,6 +696,21 @@ ENDEXT
                                   }
                               }
                           }
+                          if (keys(%cssrefs)) {
+                              my $links;
+                              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";
+                                  }
+                              }
+                              if ($links) {
+                                  if (keys(%httpref)) {
+                                      &Apache::lonnet::appenv(\%httpref);
+                                  }
+                                  $allscript .= "\n$links";
+                              }
+                          }
 # ------------------------------------------------------------------ Start body
 			  $r->print(&Apache::loncommon::start_page(undef,$allscript,
 								   {'force_register' => 1,