--- rat/lonpageflip.pm	2017/02/25 19:40:29	1.94
+++ rat/lonpageflip.pm	2017/11/16 13:42:01	1.97
@@ -2,7 +2,7 @@
 #
 # Page flip handler
 #
-# $Id: lonpageflip.pm,v 1.94 2017/02/25 19:40:29 raeburn Exp $
+# $Id: lonpageflip.pm,v 1.97 2017/11/16 13:42:01 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -279,7 +279,7 @@ sub first_answerable_ressymb {
     }
 }
 
-sub check_for_syllabus {
+sub check_http_req {
     my ($srcref) = @_;
     return unless (ref($srcref) eq 'SCALAR');
     my $usehttp;
@@ -291,11 +291,36 @@ sub check_for_syllabus {
             ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
             $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
             $usehttp = 1;
+        } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
+                 ($ENV{'SERVER_PORT'} == 443)) {
+            $usehttp = 1;
         }
     }
     return $usehttp;
 }
 
+sub reinited_js {
+    my ($url,$cid,$timeout) = @_;
+    if (!$timeout) {
+        $timeout = 0;
+    }
+    return <<"END";
+<script type="text/javascript">
+// <![CDATA[
+setTimeout(function() {
+    var newurl = '$url';
+    if (document.getElementById('LC_update_$cid')) {
+        document.getElementById('LC_update_$cid').style.display = 'none';
+    }
+    if ((newurl !== null) && (newurl !== '') && (newurl !== 'undefined')) {
+        window.location.href = "$url";
+    }
+}, $timeout);
+// ]]>
+</script>
+END
+}
+
 # ================================================================ Main Handler
 
 sub handler {
@@ -312,6 +337,7 @@ sub handler {
   my %cachehash=(); 
   my $multichoice=0;
   my %multichoicehash=();
+  my %prog_state=();
   my ($redirecturl,$redirectsymb,$enc,$anchor);
   my $next='';
   my $hostname = $r->hostname();
@@ -334,7 +360,7 @@ sub handler {
           }
       } elsif ($direction eq 'firstanswerable') {
           my $furl = &first_answerable_ressymb();
-          my $usehttp = &check_for_syllabus(\$furl);
+          my $usehttp = &check_http_req(\$furl);
           if (($usehttp) && ($hostname ne '')) {
               $furl='http://'.$hostname.$furl;
           } else {
@@ -369,8 +395,20 @@ sub handler {
                       untie(%hash);
                   }
               }
+              &Apache::loncommon::content_type($r,'text/html');
+              $r->send_http_header;
+              $r->print(&Apache::loncommon::start_page('Content Changed'));
+              my $preamble = '<div id="LC_update_'.$env{'request.course.id'}.'" class="LC_info">'.
+                             '<br />'.
+                             &mt('Your course session is being updated because of recent changes by course personnel.').
+                             ' '.&mt('Please be patient.').'<br /></div>'.
+                             '<div style="padding:0;clear:both;margin:0;border:0"></div>';
+              %prog_state = &Apache::lonhtmlcommon::Create_PrgWin($r,undef,$preamble);
+              &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Updating course'));
               my ($furl,$ferr) = &Apache::lonuserstate::readmap("$cdom/$cnum");
+              &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,&mt('Finished'));
               if ($ferr) {
+                  &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
                   my $requrl = $r->uri;
                   $env{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
                   $env{'user.reinit'} = 1;
@@ -387,15 +425,22 @@ sub handler {
       }
       if ($direction eq 'firstres') {
 	  my $furl=&first_accessible_resource();
-          my $usehttp = &check_for_syllabus(\$furl);
+          my $usehttp = &check_http_req(\$furl);
           if (($usehttp) && ($hostname ne '')) {
               $furl='http://'.$hostname.$furl;
           } else {
               $furl=&Apache::lonnet::absolute_url().$furl;
           }
-	  &Apache::loncommon::content_type($r,'text/html');
-	  $r->header_out(Location => $furl);
-	  return REDIRECT;
+          if ($reinitcheck eq 'update') {
+              &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+              $r->print(&reinited_js($furl,$env{'request.course.id'},100));
+              $r->print(&Apache::loncommon::end_page());
+              return OK;
+          } else {
+	      &Apache::loncommon::content_type($r,'text/html');
+	      $r->header_out(Location => $furl);
+	      return REDIRECT;
+          }
       }
       if ($direction eq 'return') { 
 # -------------------------------------------------------- Return to last known
@@ -406,7 +451,7 @@ sub handler {
 	    $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
 	    $newloc=$hash{'src_'.$id};
 	    if ($newloc) {
-                $usehttp = &check_for_syllabus(\$newloc);
+                $usehttp = &check_http_req(\$newloc);
 		if ($hash{'encrypted_'.$id}) { 
                     $newloc=&Apache::lonenc::encrypted($newloc);
                 } elsif ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)\#([^\#]+)$}) {
@@ -424,9 +469,15 @@ sub handler {
          } else {
              $newloc=&Apache::lonnet::absolute_url().$newloc
          }
-	 &Apache::loncommon::content_type($r,'text/html');
-	 $r->header_out(Location => $newloc);
-	 return REDIRECT;
+         if ($reinitcheck eq 'update') {
+             $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
+             $r->print(&Apache::loncommon::end_page());
+             return OK;
+         } else {
+	     &Apache::loncommon::content_type($r,'text/html');
+	     $r->header_out(Location => $newloc);
+	     return REDIRECT;
+         }
       }
 #
 # Is the current URL on the map? If not, start with last known URL
@@ -444,11 +495,18 @@ sub handler {
          if ($last) {
 	     $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]);
 	 } else {
-	     &Apache::loncommon::content_type($r,'text/html');
-	     $r->header_out(Location => 
-			    &Apache::lonnet::absolute_url().
-			    '/adm/navmaps');
-	     return REDIRECT;
+             my $newloc = &Apache::lonnet::absolute_url().
+                          '/adm/navmaps'; 
+             if ($reinitcheck eq 'update') {
+                 &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+                 $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
+                 $r->print(&Apache::loncommon::end_page());
+                 return OK;
+             } else {
+	         &Apache::loncommon::content_type($r,'text/html');
+	         $r->header_out(Location => $newloc); 
+	         return REDIRECT;
+             }
          }
       }
 # ------------------------------------------- Do we have any idea where we are?
@@ -527,9 +585,9 @@ sub handler {
                      &Apache::lonnet::linklog($redirecturl,$currenturl);
 		  }
 # ------------------------------------- Check for and display critical messages
-                  my ($redirect, $url) = &Apache::loncommon::critical_redirect(300);
+                  my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
                   unless ($redirect) {
-                      my $usehttp = &check_for_syllabus(\$redirecturl);
+                      my $usehttp = &check_http_req(\$redirecturl);
                       if (($usehttp) && ($hostname ne '')) {
                           $url='http://'.$hostname.$redirecturl;
                       } else {
@@ -545,9 +603,16 @@ sub handler {
                           $url .= $anchor;
                       }
                   }
-                  &Apache::loncommon::content_type($r,'text/html');
-                  $r->header_out(Location => $url);
-                  return REDIRECT;
+                  if ($reinitcheck eq 'update') {
+                      &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+                      $r->print(&reinited_js($url,$env{'request.course.id'},100)); 
+                      $r->print(&Apache::loncommon::end_page());
+                      return OK;
+                  } else {
+                      &Apache::loncommon::content_type($r,'text/html');
+                      $r->header_out(Location => $url);
+                      return REDIRECT;
+                  }
 	      } else {
 # --------------------------------------------------------- There was a problem
                   &Apache::loncommon::content_type($r,'text/html');
@@ -584,7 +649,7 @@ $lt{'pick'}:
 ENDSTART
                      foreach my $id (@possibilities) {
                         my $src = $multichoicehash{'src_'.$id};
-                        my $usehttp = &check_for_syllabus(\$src);
+                        my $usehttp = &check_http_req(\$src);
                         if (($usehttp) && ($hostname ne '')) {
                             $src = 'http://'.$hostname.$src;
                         }
@@ -650,12 +715,23 @@ ENDSTART
 	      }
 	  } else {
 # ------------------------------------------------- Problem, could not tie hash
+              if ($reinitcheck eq 'update') {
+                  &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+                  $r->print(&Apache::loncommon::end_page());
+              } 
               $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
               return HTTP_NOT_ACCEPTABLE; 
           }
       } else {
 # ---------------------------------------- No, could not determine where we are
-	  $r->internal_redirect('/adm/ambiguous');
+          my $newloc = '/adm/ambiguous';
+          if ($reinitcheck eq 'update') {
+              &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
+              $r->print(&reinited_js($newloc,$env{'request.course.id'},100));
+              $r->print(&Apache::loncommon::end_page());
+          } else {
+	      $r->internal_redirect($newloc);
+          }
           return OK;
       }
   } else {