--- rat/lonpageflip.pm	2003/08/15 14:49:26	1.40
+++ rat/lonpageflip.pm	2004/11/11 19:43:22	1.50
@@ -2,7 +2,7 @@
 #
 # Page flip handler
 #
-# $Id: lonpageflip.pm,v 1.40 2003/08/15 14:49:26 www Exp $
+# $Id: lonpageflip.pm,v 1.50 2004/11/11 19:43:22 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -82,6 +82,14 @@ sub fullmove {
     return($rid,$mapurl);
 }
 
+sub hash_src {
+    my ($id)=@_;
+    if ($hash{'encrypted_'.$id}) {
+	return &Apache::lonenc::encrypted($hash{'src_'.$id});
+    }
+    return $hash{'src_'.$id};
+}
+
 sub move {
     my ($rid,$mapurl,$direction)=@_;
     my $startoutrid=$rid;
@@ -120,6 +128,10 @@ sub move {
       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
 			  $mapurl=$hash{'src_'.$next};
 			  $next=$hash{'map_start_'.$hash{'src_'.$next}};
+                     } elsif (
+# This jumps back up from an empty sequence, to a page up one level
+                         $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
+                         $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
                      }
                   } elsif 
                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
@@ -156,7 +168,11 @@ sub move {
       $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
 			  $mapurl=$hash{'src_'.$next};
 			  $next=$hash{'map_finish_'.$hash{'src_'.$next}};
-                     }
+                      } elsif (
+      $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
+# This jumps back up from an empty sequence, to a page up one level
+                          $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
+                      }
                   } elsif 
                     ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
 # This comes back up from a map (going up one level);
@@ -190,6 +206,10 @@ sub handler {
       $ENV{'form.postdata'}=~/(\w+)\:(.*)/;
       my $direction=$1;
       my $currenturl=$2;
+      if ($currenturl=~m|^/enc/|) {
+	  $currenturl=&Apache::lonenc::unencrypted($currenturl);
+      }
+      $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
       if ($direction eq 'return') {
 # -------------------------------------------------------- Return to last known
          my $last;
@@ -201,12 +221,18 @@ sub handler {
          my $newloc;
          if (($last) && (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                         &GDBM_READER(),0640))) {
-            my ($murl,$fn)=split(/\_\_\_/,$last);
+            my ($murl,$fn)=&Apache::lonnet::decode_symb($last);
             my $id;
-            ($murl,$id,$fn)=split(/\_\_\_/,&Apache::lonnet::symbread($fn));
-	    $newloc=$hash{'src_'.
-                $hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id};
-            unless ($newloc) { $newloc='/adm/noidea.html'; }
+            ($murl,$id,$fn)=&Apache::lonnet::decode_symb(&Apache::lonnet::symbread($fn));
+	    $id=$hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id;
+	    $newloc=$hash{'src_'.$id};
+	    &Apache::lonnet::logthis(" hrrm 1 ");
+	    if ($newloc) {
+		if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); }
+			      
+	    } else {
+		$newloc='/adm/noidea.html';
+	    }
             untie %hash;
          } else {
 	    $newloc='/adm/noidea.html';
@@ -230,7 +256,7 @@ sub handler {
              untie(%hash);
          }
          if ($last) {
-	     $currenturl=&Apache::lonnet::clutter((split(/\_\_\_/,$last))[1]);
+	     $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[1]);
 	 } else {
 	     $r->content_type('text/html');
              $r->header_out(Location => 
@@ -242,7 +268,7 @@ sub handler {
       my $position;
       if ($position=Apache::lonnet::symbread($currenturl)) {
 # ------------------------------------------------------------------------- Yes
-	  my ($startoutmap,$mapnum,$thisurl)=split(/\_\_\_/,$position);
+	  my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
           $cachehash{$startoutmap}{$thisurl}=$mapnum;
           $cachehash{$startoutmap}{'last_known'}=
                                        &Apache::lonnet::declutter($currenturl);
@@ -259,7 +285,8 @@ sub handler {
 # -------------------------------------- Do we have one and only one empty URL?
               my $safecount=0;
               while (($next) && ($next!~/\,/) && 
-                     ((!$hash{'src_'.$next}) || ($hash{'randomout_'.$next}))
+                     ((!$hash{'src_'.$next}) || 
+		      ((!$ENV{'request.role.adv'}) && $hash{'randomout_'.$next}))
                      && ($safecount<10000)) {
                   ($next,$endupmap)=&move($next,$endupmap,$direction);
                   $safecount++;
@@ -270,7 +297,7 @@ sub handler {
                   @possibilities=split(/\,/,$next);
                   if ($#possibilities==0) {
 # ---------------------------------------------- Only one possibility, redirect
-	              $redirecturl=$hash{'src_'.$next};
+	              $redirecturl=&hash_src($next);
                       $cachehash{$endupmap}
                                 {&Apache::lonnet::declutter($redirecturl)}
 		                                 =(split(/\./,$next))[1];
@@ -388,7 +415,10 @@ ENDNONE
           }
       } else {
 # ---------------------------------------- No, could not determine where we are
-         $r->internal_redirect('/adm/ambiguous');
+	  if ( &Apache::lonnet::mod_perl_version() == 2 ) {
+	      &Apache::lonnet::cleanenv();
+	  }
+	  $r->internal_redirect('/adm/ambiguous');
       }
   } else {
 # -------------------------- Class was not initialized or page fliped strangely