--- rat/lonuserstate.pm	2004/04/05 18:25:08	1.72
+++ rat/lonuserstate.pm	2004/10/26 23:00:11	1.81
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Construct and maintain state and binary representation of course for user
 #
-# $Id: lonuserstate.pm,v 1.72 2004/04/05 18:25:08 raeburn Exp $
+# $Id: lonuserstate.pm,v 1.81 2004/10/26 23:00:11 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -41,6 +41,7 @@ use Apache::lonmsg;
 use Safe;
 use Safe::Hole;
 use Opcode;
+use Apache::lonenc;
 
 # ---------------------------------------------------- Globals for this package
 
@@ -52,6 +53,8 @@ my $errtext; # variable with all errors
 my $retfurl; # variable with the very first URL in the course
 my %randompick; # randomly picked resources
 my %randompickseed; # optional seed for randomly picking resources
+my %encurl; # URLs in this folder are supposed to be encrypted
+my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
 
 # ----------------------------------- Remove version from URL and store in hash
 
@@ -157,12 +160,11 @@ sub loadmap {
                         if ($token->[2]->{'external'} eq 'true') { # external
                             $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
                         } elsif ($turi=~/^\/*uploaded\//) { # uploaded
-			    if (($embstyle eq 'img') || ($embstyle eq 'emb')
-                             || ($embstyle eq 'ssi')) {
-                                unless ($turi =~/\.page$/) {
-                                    $turi='/adm/wrapper'.$turi;
-                                }
-                            } elsif ($turi!~/\.(sequence|page)$/) {
+			    if (($embstyle eq 'img') || ($embstyle eq 'emb')) {
+                                $turi='/adm/wrapper'.$turi;
+			    } elsif ($embstyle eq 'ssi') {
+				#do nothing with these
+			    } elsif ($turi!~/\.(sequence|page)$/) {
 				$turi='/adm/coursedocs/showdoc'.$turi;
                             }
                         } elsif ($turi=~/\S/) { # normal non-empty internal resource
@@ -276,15 +278,25 @@ sub loadmap {
                     } else {
                         $hash{'param_'.$referid}=''.$newparam;
                     }
-                    if ($token->[2]->{'name'} eq 'parameter_mapalias') {
+                    if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
 			$hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
                     }
-                    if ($token->[2]->{'name'} eq 'parameter_randompick') {
+                    if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
 			$randompick{$referid}=$token->[2]->{'value'};
                     }
-                    if ($token->[2]->{'name'} eq 'parameter_randompickseed') {
+                    if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
 			$randompick{$referid}=$token->[2]->{'value'};
                     }
+                    if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
+			if ($token->[2]->{'value'}=~/^yes$/i) {
+			    $encurl{$referid}=1;
+			}
+                    }
+                    if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
+			if ($token->[2]->{'value'}=~/^yes$/i) {
+			    $hiddenurl{$referid}=1;
+			}
+                    }
                 } 
 
             }
@@ -319,19 +331,20 @@ sub simplify {
 # -------------------------------------------------------- Build condition hash
 
 sub traceroute {
-    my ($sofar,$rid,$beenhere)=@_;
-    $sofar=simplify($sofar);
+    my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
+    my $newsofar=$sofar=simplify($sofar);
     unless ($beenhere=~/\&$rid\&/) {
        $beenhere.=$rid.'&';  
+       my ($mapid,$resid)=split(/\./,$rid);
+       my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
+       my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
+       if ($hdnflag || lc($hidden) eq 'yes') { $hiddenurl{$rid}=1; }
+       my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
+       if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
        if (($retfurl eq '') && ($hash{'src_'.$rid})
-        && ($hash{'src_'.$rid}!~/\.sequence$/)) {
-           my ($mapid,$resid)=split(/\./,$rid);
-           $retfurl=$hash{'src_'.$rid}.
-           (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='.
-           &Apache::lonnet::symbclean(
-                           &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
-                           '___'.$resid.'___'.
-                           &Apache::lonnet::declutter($hash{'src_'.$rid}));
+	   && ($hash{'src_'.$rid}!~/\.sequence$/)) {
+           $retfurl=$hash{'src_'.$rid}.(($hash{'src_'.$rid}=~/\?/)?'&':'?').
+	       'symb='.$symb;
        }
        if (defined($hash{'conditions_'.$rid})) {
 	   $hash{'conditions_'.$rid}=simplify(
@@ -339,13 +352,14 @@ sub traceroute {
        } else {
            $hash{'conditions_'.$rid}=$sofar;
        }
+       $newsofar=$hash{'conditions_'.$rid};
        if (defined($hash{'is_map_'.$rid})) {
            if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
-	       &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&');
-               if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) {
-		   $sofar=
-                  $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}};
-               }
+	       $sofar=$newsofar=
+		   &traceroute($sofar,
+			       $hash{'map_start_'.$hash{'src_'.$rid}},'&',
+			       $encflag || $encurl{$rid},
+			       $hdnflag || $hiddenurl{$rid});
            }
        }
        if (defined($hash{'to_'.$rid})) {
@@ -360,10 +374,12 @@ sub traceroute {
                                  .$hash{'undercond_'.$_}.'. ';
                    }
                 }
-                &traceroute($further,$hash{'goesto_'.$_},$beenhere);
+                $newsofar=&traceroute($further,$hash{'goesto_'.$_},$beenhere,
+				      $encflag,$hdnflag);
           }
        }
     }
+    return $newsofar;
 }
 
 # ------------------------------ Cascading conditions, quick access, parameters
@@ -429,9 +445,9 @@ sub accinit {
                    /(\&\Q$urifile\E\:[^\&]*)/) {
 		    my $replace=$1;
                     my $regexp=$replace;
-                    $regexp=~s/\|/\\\|/g;
+                    #$regexp=~s/\|/\\\|/g;
                     $acchash{'acc.res.'.$short.'.'.$uripath}
-                     =~s/$regexp/$replace\|$uricond/;
+                     =~s/\Q$regexp\E/$replace\|$uricond/;
                 } else {
 		   $acchash{'acc.res.'.$short.'.'.$uripath}.=
                      $urifile.':'.$uricond.'&';
@@ -448,15 +464,12 @@ sub accinit {
     my $courseuri=$uri;
     $courseuri=~s/^\/res\///;
     &Apache::lonnet::delenv('(acc\.|httpref\.)');
-    &Apache::lonnet::appenv(%acchash,
-                            "request.course.id"  => $short,
-                            "request.course.fn"  => $fn,
-                            "request.course.uri" => $courseuri); 
+    &Apache::lonnet::appenv(%acchash);
 }
 
-# ------------------------------------- Selectively delete from randompick maps
+# ---------------- Selectively delete from randompick maps and hidden url parms
 
-sub pickrandom {
+sub hiddenurls {
     my $randomoutentry='';
     foreach my $rid (keys %randompick) {
         my $rndpick=$randompick{$rid};
@@ -498,6 +511,18 @@ sub pickrandom {
             }
         }
     }
+# ------------------------------ take care of explicitly hidden urls or folders
+    foreach my $rid (keys %hiddenurl) {
+	$hash{'randomout_'.$rid}=1;
+	my ($mapid,$resid)=split(/\./,$rid);
+	$randomoutentry.='&'.
+	    &Apache::lonnet::symbclean(
+		         &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
+				       '___'.$resid.'___'.
+		    &Apache::lonnet::declutter($hash{'src_'.$rid})
+				       ).'&';
+    }
+# --------------------------------------- append randomout entry to environment
     if ($randomoutentry) {
 	&Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
     }
@@ -523,6 +548,8 @@ sub readmap {
    unlink($fn.'.state');
    unlink($fn.'parms.db');
    undef %randompick;
+   undef %hiddenurl;
+   undef %encurl;
    $retfurl='';
    if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
        (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
@@ -538,9 +565,12 @@ sub readmap {
     $hash{'is_map_0.0'}=1;
     loadmap($uri);
     if (defined($hash{'map_start_'.$uri})) {
+	&Apache::lonnet::appenv("request.course.id"  => $short,
+				"request.course.fn"  => $fn,
+				"request.course.uri" => $uri);
         &traceroute('0',$hash{'map_start_'.$uri},'&');
         &accinit($uri,$short,$fn);
-        &pickrandom();
+        &hiddenurls();
     }
 # ------------------------------------------------------- Put versions into src
     foreach (keys %hash) {
@@ -548,10 +578,17 @@ sub readmap {
 	    $hash{$_}=&putinversion($hash{$_});
 	}
     }
+# ---------------------------------------------------------------- Encrypt URLs
+    foreach (keys %encurl) {
+	$hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_});
+    }
+# ----------------------------------------------- Close hashes to finally store
+# --------------------------------- Routine must pass this point, no early outs
     unless ((untie(%hash)) && (untie(%parmhash))) {
       &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                        "Could not untie coursemap $fn for $uri.</font>"); 
     }
+# ---------------------------------------------------- Store away initial state
     {
      my $cfh;
      if ($cfh=Apache::File->new(">$fn.state")) {
@@ -581,39 +618,37 @@ sub readmap {
 # ------------------------------------------------------- Evaluate state string
 
 sub evalstate {
-
     my $fn=$ENV{'request.course.fn'}.'.state';
-    my $state='2';
+    my $state='';
     if (-e $fn) {
-       my @conditions=();
-       {
-        my $fh=Apache::File->new($fn);
-        @conditions=<$fh>;
-       }  
-       my $safeeval = new Safe;
-       my $safehole = new Safe::Hole;
-       $safeeval->permit("entereval");
-       $safeeval->permit(":base_math");
-       $safeeval->deny(":base_io");
-       $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
-       foreach (@conditions) {
-	   my $line=$_;
-           chomp($line);
-	   my ($condition,$weight)=split(/\:/,$_);
-           if ($safeeval->reval($condition)) {
-	       if ($weight eq 'force') {
-		   $state.='3';
-               } else {
-                   $state.='2';
-               }
-           } else {
-               if ($weight eq 'stop') {
-		   $state.='0';
-               } else {
-                   $state.='1';
-               }
-           }
-       }
+	my @conditions=();
+	{
+	    my $fh=Apache::File->new($fn);
+	    @conditions=<$fh>;
+	}  
+	my $safeeval = new Safe;
+	my $safehole = new Safe::Hole;
+	$safeeval->permit("entereval");
+	$safeeval->permit(":base_math");
+	$safeeval->deny(":base_io");
+	$safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
+	foreach my $line (@conditions) {
+	    chomp($line);
+	    my ($condition,$weight)=split(/\:/,$line);
+	    if ($safeeval->reval($condition)) {
+		if ($weight eq 'force') {
+		    $state.='3';
+		} else {
+		    $state.='2';
+		}
+	    } else {
+		if ($weight eq 'stop') {
+		    $state.='0';
+		} else {
+		    $state.='1';
+		}
+	    }
+	}
     }
     &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state);
     return $state;