--- rat/lonpageflip.pm	2010/03/16 19:56:02	1.80
+++ rat/lonpageflip.pm	2020/09/08 04:37:22	1.80.8.11.2.1
@@ -2,7 +2,7 @@
 #
 # Page flip handler
 #
-# $Id: lonpageflip.pm,v 1.80 2010/03/16 19:56:02 droeschl Exp $
+# $Id: lonpageflip.pm,v 1.80.8.11.2.1 2020/09/08 04:37:22 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -36,6 +36,8 @@ use LONCAPA;
 use Apache::Constants qw(:common :http REDIRECT);
 use Apache::lonnet;
 use Apache::loncommon();
+use Apache::lonuserstate;
+use Apache::lonlocal;
 use HTML::TokeParser;
 use GDBM_File;
 
@@ -81,11 +83,18 @@ sub hash_src {
     my ($mapid,$resid)=split(/\./,$id);
     my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
 					  $resid,$hash{'src_'.$id});
+    my $anchor;
+    if ($hash{'ext_'.$id} eq 'true:') {
+        if ($hash{'src_'.$id} =~ /(\#.+)$/) {
+            $anchor = $1;
+        }
+    }
     if ($hash{'encrypted_'.$id}) {
 	return (&Apache::lonenc::encrypted($hash{'src_'.$id}),
-		&Apache::lonenc::encrypted($symb));
+		&Apache::lonenc::encrypted($symb),
+                $hash{'encrypted_'.$id},$anchor);
     }
-    return ($hash{'src_'.$id},$symb);
+    return ($hash{'src_'.$id},$symb,$hash{'encrypted_'.$id},$anchor);
 }
 
 sub move {
@@ -246,6 +255,54 @@ sub first_accessible_resource {
     }
 }
 
+sub check_http_req {
+    my ($srcref) = @_;
+    return unless (ref($srcref) eq 'SCALAR');
+    my $usehttp;
+    if ($env{'request.course.id'}) {
+        my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+        my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+        if (($$srcref =~ m{^\Q/public/$cdom/$cnum/syllabus\E($|\?)}) &&
+            ($ENV{'SERVER_PORT'} == 443) &&
+            ($env{'course.'.$env{'request.course.id'}.'.externalsyllabus'} =~ m{^http://})) {
+            unless (&Apache::lonnet::uses_sts()) {
+                $$srcref .= (($$srcref =~/\?/)? '&':'?') . 'usehttp=1';
+                $usehttp = 1;
+            }
+        } elsif (($$srcref =~ m{^\Q/adm/wrapper/ext/\E(?!https:)}) &&
+                 ($ENV{'SERVER_PORT'} == 443)) {
+            unless (&Apache::lonnet::uses_sts()) {
+                my ($url,$anchor) = ($$srcref =~ /^([^\#]+)(?:|(\#[^\#]+))$/);
+                $$srcref = $url . (($$srcref =~/\?/)? '&':'?') . 'usehttp=1' .$anchor;
+                $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 {
@@ -262,81 +319,173 @@ sub handler {
   my %cachehash=(); 
   my $multichoice=0;
   my %multichoicehash=();
-  my ($redirecturl,$redirectsymb);
+  my %prog_state=(); 
+  my ($redirecturl,$redirectsymb,$enc,$anchor);
   my $next='';
+  my $hostname = $r->hostname();
   my @possibilities=();
    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
   if (($env{'form.postdata'})&&($env{'request.course.fn'})) {
-      $env{'form.postdata'}=~/(\w+)\:(.*)/;
-      my $direction=$1;
-      my $currenturl=$2;
+      my ($direction,$currenturl) = ($env{'form.postdata'}=~/(\w+)\:(.*)/);
       if ($currenturl=~m|^/enc/|) {
-	  $currenturl=&Apache::lonenc::unencrypted($currenturl);
+          $currenturl=&Apache::lonenc::unencrypted($currenturl);
       }
       $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
+      $currenturl=~s/^https?\:\/\///;
+      $currenturl=~s/^[^\/]+//;
+      my ($preupdatepos,$last,$reinitcheck);
+      if ($direction eq 'return') {
+          if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
+                    &GDBM_READER(),0640)) {
+              $last=$hash{'last_known'};
+              untie(%hash);
+          }
+      }
+      if ($env{'request.course.id'}) {
+          # Check if course needs to be re-initialized
+          my $loncaparev = $r->dir_config('lonVersion');
+          ($reinitcheck,my @reinit) = &Apache::loncommon::needs_coursereinit($loncaparev);
+          if ($reinitcheck eq 'switch') {
+              &Apache::loncommon::content_type($r,'text/html');
+              $r->send_http_header;
+              $r->print(&Apache::loncommon::check_release_result(@reinit));
+              return OK;
+          } elsif ($reinitcheck eq 'update') {
+              my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+              my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+              $preupdatepos = &Apache::lonnet::symbread($currenturl);
+              unless ($direction eq 'return') {
+                  if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
+                                &GDBM_READER(),0640)) {
+                      $last=$hash{'last_known'};
+                      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";
+                  $env{'user.reinit'} = 1;
+                  return HTTP_NOT_ACCEPTABLE;
+              } else {
+                  if ($last) {
+                      my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
+                      unless (&Apache::lonnet::symbverify($last,$fn)) {
+                          undef($last);
+                      }
+                  }
+              }
+          }
+      }
       if ($direction eq 'firstres') {
 	  my $furl=&first_accessible_resource();
-	  &Apache::loncommon::content_type($r,'text/html');
-	  $r->header_out(Location => 
-			 &Apache::lonnet::absolute_url().$furl);
-	     
-	  return REDIRECT;
+          my $usehttp = &check_http_req(\$furl);
+          if (($usehttp) && ($hostname ne '')) {
+              $furl='http://'.$hostname.$furl;
+          } else {
+              $furl=&Apache::lonnet::absolute_url().$furl;
+          }
+          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
-         my $last;
-         if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
-                    &GDBM_READER(),0640)) {
-	     $last=$hash{'last_known'};
-             untie(%hash);
-         }
-         my $newloc;
+         my ($newloc,$usehttp);
          if (($last) && (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'.db',
                         &GDBM_READER(),0640))) {
             my ($murl,$id,$fn)=&Apache::lonnet::decode_symb($last);
 	    $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
 	    $newloc=$hash{'src_'.$id};
 	    if ($newloc) {
-		if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
-			      
+                $usehttp = &check_http_req(\$newloc);
+                if ($hash{'encrypted_'.$id}) {
+                    $newloc=&Apache::lonenc::encrypted($newloc);
+                }
+                if ($newloc =~ m{^(/adm/wrapper/ext/[^\#]+)(?:|(\#[^\#]+))$}) {
+                    my ($url,$anchor) = ($1,$2);
+                    if ($anchor) {
+                        $newloc = $url.(($url=~/\?/)?'&':'?').'symb='.&escape($last).$anchor;
+                    }
+                }
 	    } else {
 		$newloc='/adm/navmaps';
 	    }
             untie %hash;
          } else {
 	    $newloc='/adm/navmaps';
-         }  
-	     &Apache::loncommon::content_type($r,'text/html');
-	     $r->header_out(Location => 
-			    &Apache::lonnet::absolute_url().$newloc);
-	     
-	     return REDIRECT;
+         }
+         if (($usehttp) && ($hostname ne '')) {
+             $newloc='http://'.$hostname.$newloc;
+         } else {
+             $newloc=&Apache::lonnet::absolute_url().$newloc
+         }
+         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;
+         }
       }
-      $currenturl=~s/^https?\:\/\///;
-      $currenturl=~s/^[^\/]+//;
 #
 # Is the current URL on the map? If not, start with last known URL
 #
+
       unless (&Apache::lonnet::is_on_map($currenturl)) {
-	 my $last;
-         if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
-                    &GDBM_READER(),0640)) {
-	     $last=$hash{'last_known'};
+         if ($preupdatepos) {
+             undef($preupdatepos);
+         } elsif (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
+                            &GDBM_READER(),0640)) {
+             $last=$hash{'last_known'};
              untie(%hash);
          }
          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/noidea.html');
-		 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?
       my $position;
-      if ($position=Apache::lonnet::symbread($currenturl)) {
+      if ($preupdatepos) {
+          $position = $preupdatepos;
+      } else {
+          $position=Apache::lonnet::symbread($currenturl);
+      }
+      if ($position) {
 # ------------------------------------------------------------------------- Yes
 	  my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
           $cachehash{$startoutmap}{$thisurl}=[$thisurl,$mapnum];
@@ -359,7 +508,7 @@ sub handler {
                   @possibilities=split(/\,/,$next);
                   if ($#possibilities==0) {
 # ---------------------------------------------- Only one possibility, redirect
-	              ($redirecturl,$redirectsymb)=&hash_src($next);
+	              ($redirecturl,$redirectsymb,$enc,$anchor)=&hash_src($next);
                       $cachehash{$endupmap}{$redirecturl}=
 			  [$redirecturl,(split(/\./,$next))[1]];
                   } else {
@@ -389,7 +538,7 @@ sub handler {
 	      untie(%hash);
 # --------------------------------------------------------- Store position info
               $cachehash{$startoutmap}{'last_direction'}=[$direction,'notasymb'];
-              foreach my $thismap (keys %cachehash) {
+              foreach my $thismap (keys(%cachehash)) {
 		  my $mapnum=$cachehash{$thismap}->{'mapnum'};
 		  delete($cachehash{$thismap}->{'mapnum'});
 		  &Apache::lonnet::symblist($thismap,
@@ -404,26 +553,35 @@ sub handler {
 		  if ($direction eq 'back') {
                      &Apache::lonnet::linklog($redirecturl,$currenturl);
 		  }
-# ------------------------------------------------- Check for critical messages
-		  if ((time-$env{'user.criticalcheck.time'})>300) {
-                     my @what=&Apache::lonnet::dump
-                                  ('critical',$env{'user.domain'},
-                                              $env{'user.name'});
-                     if ($what[0]) {
-	                if (($what[0] ne 'con_lost') && 
-                            ($what[0]!~/^error\:/)) {
-	                   $redirecturl='/adm/email?critical=display';
-			   $redirectsymb='';
-                        }
-                     }
-                     &Apache::lonnet::appenv({'user.criticalcheck.time'=>time});
-		  }
-
-		  &Apache::loncommon::content_type($r,'text/html');
-		  my $url=&Apache::lonnet::absolute_url().$redirecturl;
-		  $url = &add_get_param($url, { 'symb' => $redirectsymb});
-                  $r->header_out(Location => $url);
-                  return REDIRECT;
+# ------------------------------------- Check for and display critical messages
+                  my ($redirect, $url) = &Apache::loncommon::critical_redirect(300,'flip');
+                  unless ($redirect) {
+                      my $usehttp = &check_http_req(\$redirecturl);
+                      if (($usehttp) && ($hostname ne '')) {
+                          $url='http://'.$hostname.$redirecturl;
+                      } else {
+                          $url=&Apache::lonnet::absolute_url().$redirecturl;
+                      }
+                      my $addanchor;
+                      if (($anchor ne '') && (!$enc || $env{'request.role.adv'})) {
+                          $addanchor = 1;
+                          $url =~ s/\#.+$//;
+                      }
+                      $url = &add_get_param($url, { 'symb' => $redirectsymb});
+                      if ($addanchor) {
+                          $url .= $anchor;
+                      }
+                  }
+                  if ($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');
@@ -432,13 +590,19 @@ sub handler {
 						     'explain' =>
 						     'You have reached the end of the sequence of materials.',
 						     'back' => 'Go Back',
-						     'nav' => 'Navigate Course Content',
+						     'nav' => 'Course Contents',
 						     'wherenext' =>
 						     'There are several possibilities of where to go next',
 						     'pick' =>
 						     'Please click on the the resource you intend to access',
 						     'titleheader' => 'Title',
-						     'type' => 'Type');
+						     'type' => 'Type',
+                                                     'update' => 'Content updated',
+                                                     'expupdate' => 'As a result of a recent update to the sequence of materials, it is not possible to complete the page flip.',
+                                                     'gonav' => 'Go to the Contents page to select a resource to display.');
+                  if (&Apache::loncommon::course_type() eq 'Community') {
+                      $lt{'nav'} = &mt('Community Contents');
+                  }
                   if ($#possibilities>0) {
 		      my $start_page=
 			  &Apache::loncommon::start_page('Multiple Resources');
@@ -452,9 +616,14 @@ $lt{'pick'}:
 <tr><th>$lt{'titleheader'}</th><th>$lt{'type'}</th></tr>
 ENDSTART
                      foreach my $id (@possibilities) {
+                        my $src = $multichoicehash{'src_'.$id};
+                        my $usehttp = &check_http_req(\$src);
+                        if (($usehttp) && ($hostname ne '')) {
+                            $src = 'http://'.$hostname.$src;
+                        }
                         $r->print(
                               '<tr><td><a href="'.
-				  &add_get_param($multichoicehash{'src_'.$id},
+				  &add_get_param($src,
 						 {'symb' =>
 						      $multichoicehash{'symb_'.$id},
 						  }).'">'.
@@ -464,31 +633,60 @@ ENDSTART
                      }
                      $r->print('</table>');
                   } else {
-		      my $start_page=
-			  &Apache::loncommon::start_page('No Resource');
-		      $r->print(<<ENDNONE);
-$start_page
-<h3>$lt{'title'}</h3>
-<p>$lt{'explain'}</p>
-ENDNONE
+                      if ($reinitcheck) {
+                          if (&Apache::loncommon::course_type() eq 'Community') {
+                              $r->print(
+                                  &Apache::loncommon::start_page('Community Contents Updated'));
+                          } else { 
+                              $r->print(
+                                  &Apache::loncommon::start_page('Course Contents Updated'));
+                          }
+                          $r->print('<h2>'.$lt{'update'}.'</h2>'
+                                  .'<p>'.$lt{'expupdate'}.'<br />'
+                                  .$lt{'gonav'}.'</p>');
+                      } else {
+                          $r->print(
+                              &Apache::loncommon::start_page('No Resource')
+                             .'<h2>'.$lt{'title'}.'</h2>'
+                             .'<p>'.$lt{'explain'}.'</p>');
+                      }
 		  }
-		  $r->print(<<ENDMENU);
-<ul>
-<li><a href="/adm/flip?postdata=return:">$lt{'back'}</a></li>
-<li><a href="/adm/navmaps">$lt{'nav'}</a></li>
-</ul>
-ENDMENU
+                  if ((!@possibilities) && ($reinitcheck))  {
+                      $r->print(
+                          &Apache::lonhtmlcommon::actionbox(
+                              ['<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
+                              ]));
+                  } else {
+                      $r->print(
+                          &Apache::lonhtmlcommon::actionbox(
+                              ['<a href="/adm/flip?postdata=return:">'.$lt{'back'}.'</a></li>',
+                               '<a href="/adm/navmaps">'.$lt{'nav'}.'</a></li>'
+                              ]));
+                  }
                   $r->print(&Apache::loncommon::end_page());
+      
                   return OK;
 	      }
 	  } else {
 # ------------------------------------------------- Problem, could not tie hash
+              if ($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 {
 # -------------------------- Class was not initialized or page fliped strangely