--- rat/lonuserstate.pm	2014/02/23 20:27:54	1.148
+++ rat/lonuserstate.pm	2022/05/29 12:35:02	1.149.2.5.2.2
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Construct and maintain state and binary representation of course for user
 #
-# $Id: lonuserstate.pm,v 1.148 2014/02/23 20:27:54 raeburn Exp $
+# $Id: lonuserstate.pm,v 1.149.2.5.2.2 2022/05/29 12:35:02 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -42,7 +42,7 @@ use Safe::Hole;
 use Opcode;
 use Apache::lonenc;
 use Fcntl qw(:flock);
-use LONCAPA;
+use LONCAPA qw(:DEFAULT :match);  
 use File::Basename;
 
  
@@ -62,6 +62,9 @@ my %randomorder; # maps to order content
 my %randomizationcode; # code used to grade folder for bubblesheet exam 
 my %encurl; # URLs in this folder are supposed to be encrypted
 my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
+my %deeplinkout; # this URL (or complete folder) unavailable in deep-link session
+my %rescount; # count of unhidden items in each map
+my %mapcount; # count of unhidden maps in each map
 
 # ----------------------------------- Remove version from URL and store in hash
 
@@ -240,6 +243,8 @@ sub loadmap {
 
     my @map_ids;
     my $codechecked;
+    $rescount{$lpc} = 0;
+    $mapcount{$lpc} = 0;
     while (my $token = $parser->get_token) {
 	next if ($token->[0] ne 'S');
 
@@ -249,6 +254,13 @@ sub loadmap {
 	    my $resource_id = &parse_resource($token,$lpc,$ispage,$uri,$courseid);
 	    if (defined $resource_id) {
 		push(@map_ids, $resource_id);
+                if ($hash{'src_'.$lpc.'.'.$resource_id}) {
+                    $rescount{$lpc} ++;
+                    if (($hash{'src_'.$lpc.'.'.$resource_id}=~/\.sequence$/) ||
+                        ($hash{'src_'.$lpc.'.'.$resource_id}=~/\.page$/)) {
+                        $mapcount{$lpc} ++;
+                    }
+                }
                 unless ($codechecked) {
                     my $startsymb =
                        &Apache::lonnet::encode_symb($hash{'map_id_'.$lpc},$resource_id,
@@ -278,19 +290,10 @@ sub loadmap {
     }
     undef($codechecked);
 
-
     # Handle randomization and random selection
 
     if ($randomize) {
-        my $advanced;
-        if ($env{'request.course.id'}) {
-            $advanced = (&Apache::lonnet::allowed('adv') eq 'F');
-        } else {
-            $env{'request.course.id'} = $courseid;
-            $advanced = (&Apache::lonnet::allowed('adv') eq 'F');
-            $env{'request.course.id'} = '';
-        }
-        unless ($advanced) {
+        unless (&is_advanced($courseid)) {
             # Order of resources is not randomized if user has and advanced role in the course.
 	    my $seed;
 
@@ -338,7 +341,6 @@ sub loadmap {
 	    @map_ids=&Math::Random::random_permutation(@map_ids);
 	}
 
-
 	my $from = shift(@map_ids);
 	my $from_rid = $lpc.'.'.$from;
 	$hash{'map_start_'.$uri} = $from_rid;
@@ -363,7 +365,7 @@ sub loadmap {
     $parser = HTML::TokeParser->new(\$instr);
     $parser->attr_encoded(1);
 
-    # last parse out the mapalias params.  Thes provide mnemonic
+    # last parse out the mapalias params.  These provide mnemonic
     # tags to resources that can be used in conditions
 
     while (my $token = $parser->get_token) {
@@ -374,6 +376,18 @@ sub loadmap {
     }
 }
 
+sub is_advanced {
+    my ($courseid) = @_;
+    my $advanced;
+    if ($env{'request.course.id'}) {
+        $advanced = (&Apache::lonnet::allowed('adv') eq 'F');
+    } else {
+        $env{'request.course.id'} = $courseid;
+        $advanced = (&Apache::lonnet::allowed('adv') eq 'F');
+        $env{'request.course.id'} = '';
+    }
+    return $advanced;
+}
 
 # -------------------------------------------------------------------- Resource
 #
@@ -460,7 +474,11 @@ sub parse_resource {
     # is not a page.  If the resource is a page then it must be
     # assembled (at fetch time?).
 
-    unless ($ispage) {
+    if ($ispage) {
+        if ($token->[2]->{'external'} eq 'true') { # external
+            $turi=~s{^http\://}{/ext/};
+        }
+    } else {
 	$turi=~/\.(\w+)$/;
 	my $embstyle=&Apache::loncommon::fileembstyle($1);
 	if ($token->[2]->{'external'} eq 'true') { # external
@@ -475,6 +493,8 @@ sub parse_resource {
 	    } elsif ($turi!~/\.(sequence|page)$/) {
 		$turi='/adm/coursedocs/showdoc'.$turi;
 	    }
+        } elsif ($turi=~ m{^/adm/$match_domain/$match_courseid/\d+/ext\.tool$}) {
+            $turi='/adm/wrapper'.$turi;
 	} elsif ($turi=~/\S/) { # normal non-empty internal resource
 	    my $mapdir=$uri;
 	    $mapdir=~s/[^\/]+$//;
@@ -550,7 +570,9 @@ sub parse_resource {
     if (($turi=~/\.sequence$/) ||
 	($turi=~/\.page$/)) {
 	$hash{'is_map_'.$rid}=1;
-	&loadmap($turi,$rid,$courseid);
+	if ((!$hiddenurl{$rid}) || (&is_advanced($courseid))) {
+	    &loadmap($turi,$rid,$courseid);
+	}
     } 
     return $token->[2]->{'id'};
 }
@@ -706,7 +728,7 @@ sub parse_condition {
 #  Typical attributes:
 #     to=n      - Number of the resource the parameter applies to.
 #     type=xx   - Type of parameter value (e.g. string_yesno or int_pos).
-#     name=xxx  - Name ofr parameter (e.g. parameter_randompick or parameter_randomorder).
+#     name=xxx  - Name of parameter (e.g. parameter_randompick or parameter_randomorder).
 #     value=xxx - value of the parameter.
 
 sub parse_param {
@@ -883,7 +905,7 @@ sub simplify {
 #    new value indicating how far the map has been traversed (the sofar).
 #
 sub traceroute {
-    my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
+    my ($sofar,$rid,$beenhere,$encflag,$hdnflag,$cid)=@_;
     my $newsofar=$sofar=simplify($sofar);
 
     unless ($beenhere=~/\&\Q$rid\E\&/) {
@@ -907,6 +929,30 @@ sub traceroute {
 	    $retfrid=$rid;
 	}
 
+        my (@deeplink,@recurseup);
+        if ($hash{'is_map_'.$rid}) {
+            my ($cdom,$cnum) = split(/_/,$cid);
+            my $mapsrc = $hash{'src_'.$rid};
+            my $map_pc = $hash{'map_pc_'.$mapsrc};
+            my @pcs = split(/,/,$hash{'map_hierarchy_'.$map_pc});
+            shift(@pcs);
+            @recurseup = map { &Apache::lonnet::declutter($hash{'map_id_'.$_}) } reverse(@pcs);
+            my $mapname = &Apache::lonnet::declutter(&Apache::lonnet::deversion($mapsrc));
+            my $deeplinkval = &get_mapparam($env{'user.name'},$env{'user.domain'},$cnum,$cdom,
+                                            $rid,$mapname,'0.deeplink',\@recurseup);
+            if ($deeplinkval ne '') {
+                @deeplink = ($deeplinkval,'map');
+            }
+        } else {
+            my @pcs = split(/,/,$hash{'map_hierarchy_'.$mapid});
+            shift(@pcs);
+            @recurseup = map { &Apache::lonnet::declutter($hash{'map_id_'.$_}) } reverse(@pcs);
+            @deeplink = &Apache::lonnet::EXT('resource.0.deeplink',$symb,'','','','',$cid,\@recurseup);
+        }
+        unless (@deeplink < 2) {
+            $hash{'deeplinkonly_'.$rid}=join(':',map { &escape($_); } @deeplink);
+        }
+
 	if (defined($hash{'conditions_'.$rid})) {
 	    $hash{'conditions_'.$rid}=simplify(
            '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
@@ -928,7 +974,8 @@ sub traceroute {
 				$hash{'map_start_'.$hash{'src_'.$rid}},
 				$beenhere,
 				$encflag || $encurl{$rid},
-				$hdnflag || $hiddenurl{$rid});
+				$hdnflag || $hiddenurl{$rid},
+                                $cid);
 	    }
 	}
 
@@ -955,7 +1002,7 @@ sub traceroute {
                 }
 		#  Recurse to resoruces that have to's to us.
                 $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
-				      $encflag,$hdnflag);
+				      $encflag,$hdnflag,$cid);
 	    }
 	}
     }
@@ -1072,7 +1119,7 @@ sub accinit {
 
 sub hiddenurls {
     my $randomoutentry='';
-    foreach my $rid (keys %randompick) {
+    foreach my $rid (keys(%randompick)) {
         my $rndpick=$randompick{$rid};
         my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
 # ------------------------------------------- put existing resources into array
@@ -1114,6 +1161,14 @@ sub hiddenurls {
             if ($currentrids[$k]) {
 		$hash{'randomout_'.$currentrids[$k]}=1;
                 my ($mapid,$resid)=split(/\./,$currentrids[$k]);
+                if ($rescount{$mapid}) {
+                    $rescount{$mapid} --;
+                }
+                if ($hash{'is_map_'.$currentrids[$k]}) {
+                    if ($mapcount{$mapid}) {
+                        $mapcount{$mapid} --;
+                    }
+                }
                 $randomoutentry.='&'.
 		    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
 						 $resid,
@@ -1123,9 +1178,17 @@ sub hiddenurls {
         }
     }
 # ------------------------------ take care of explicitly hidden urls or folders
-    foreach my $rid (keys %hiddenurl) {
+    foreach my $rid (keys(%hiddenurl)) {
 	$hash{'randomout_'.$rid}=1;
 	my ($mapid,$resid)=split(/\./,$rid);
+        if ($rescount{$mapid}) {
+            $rescount{$mapid} --;
+        }
+        if ($hash{'is_map_'.$rid}) {
+            if ($mapcount{$mapid}) {
+                $mapcount{$mapid} --;
+            }
+        }
 	$randomoutentry.='&'.
 	    &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
 					 $hash{'src_'.$rid}).'&';
@@ -1136,10 +1199,53 @@ sub hiddenurls {
     }
 }
 
+sub deeplinkouts {
+    my $deeplinkoutentry;
+    foreach my $rid (keys(%deeplinkout)) {
+        $hash{'deeplinkout_'.$rid}=1;
+        my ($mapid,$resid)=split(/\./,$rid);
+        $deeplinkoutentry.='&'.
+            &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
+                                         $hash{'src_'.$rid}).'&';
+    }
+# --------------------------------------- append deeplinkout entry to environment
+    if ($deeplinkoutentry) {
+        &Apache::lonnet::appenv({'acc.deeplinkout' => $deeplinkoutentry});
+    }
+}
+
+# -------------------------------------- populate big hash with map breadcrumbs
+
+# Create map_breadcrumbs_$pc from map_hierarchy_$pc by omitting intermediate
+# maps not shown in Course Contents table.
+
+sub mapcrumbs {
+    my ($cid) = @_;
+    foreach my $key (keys(%rescount)) {
+        if ($hash{'map_hierarchy_'.$key}) {
+            my $skipnext = 0;
+            foreach my $id (split(/,/,$hash{'map_hierarchy_'.$key}),$key) {
+                my $rid = $hash{'ids_'.$hash{'map_id_'.$id}};
+                unless (($skipnext) || (!&is_advanced($cid) && $hash{'deeplinkout_'.$rid})) {
+                    $hash{'map_breadcrumbs_'.$key} .= "$id,";
+                }
+                unless (($id == 0) || ($id == 1)) {
+                    if ((!$rescount{$id}) || ($rescount{$id} == 1 && $mapcount{$id} == 1)) {
+                        $skipnext = 1;
+                    } else {
+                        $skipnext = 0;
+                    }
+                }
+            }
+            $hash{'map_breadcrumbs_'.$key} =~ s/,$//;
+        }
+    }
+}
+
 # ---------------------------------------------------- Read map and all submaps
 
 sub readmap {
-    my $short=shift;
+    my ($short,$critmsg_check) = @_;
     $short=~s/^\///;
 
     # TODO:  Hidden dependency on current user:
@@ -1156,7 +1262,7 @@ sub readmap {
     }
     @cond=('true:normal');
 
-    unless (open(LOCKFILE,">$fn.db.lock")) {
+    unless (open(LOCKFILE,">","$fn.db.lock")) {
 	# 
 	# Most likely a permissions problem on the lockfile or its directory.
 	#
@@ -1174,8 +1280,14 @@ sub readmap {
         &unlink_tmpfiles($fn);
     }
     undef %randompick;
+    undef %randompickseed;
+    undef %randomorder;
+    undef %randomizationcode;
     undef %hiddenurl;
     undef %encurl;
+    undef %deeplinkout;
+    undef %rescount;
+    undef %mapcount;
     $retfrid='';
     $errtext='';
     my ($untiedhash,$untiedparmhash,$tiedhash,$tiedparmhash); # More state flags.
@@ -1317,8 +1429,14 @@ sub readmap {
             $lock=1;
         }
         undef %randompick;
+        undef %randompickseed;
+        undef %randomorder;
+        undef %randomizationcode;
         undef %hiddenurl;
         undef %encurl;
+        undef %deeplinkout;
+        undef %rescount;
+        undef %mapcount;
         $errtext='';
         $retfrid='';
 	#
@@ -1366,14 +1484,18 @@ sub readmap {
 
 #  Depends on user must parameterize this as well..or separate as this is:
 #  more part of determining what someone sees on entering a course?
+#  When lonuserstate::readmap() is called from lonroles.pm, i.e.,
+#  after selecting a role in a course, critical_redirect will be called,
+#  unless the course has a blocking event in effect, which suppresses
+#  critical message checking (users without evb priv).
+#
 
-    my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
-				   $env{'user.name'});
-    if ($what[0]) {
-	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
-	    $retfurl='/adm/email?critical=display';
+    if ($critmsg_check) {
+        my ($redirect,$url) = &Apache::loncommon::critical_redirect();
+        if ($redirect) {
+            $retfurl = $url;
         }
-    }
+    } 
     return ($retfurl,$errtext);
 }
 
@@ -1421,7 +1543,6 @@ sub build_tmp_hashes {
     # Load the map.. note that loadmap may implicitly recurse if the map contains 
     # sub-maps.
 
-
     &loadmap($uri,'0.0',$short);
 
     #  The code below only executes if there is a starting point for the map>
@@ -1434,7 +1555,7 @@ sub build_tmp_hashes {
                                  "request.course.uri" => $uri,
                                  "request.course.tied" => time});
         $env{'request.course.id'}=$short;
-        &traceroute('0',$hash{'map_start_'.$uri},'&');
+        &traceroute('0',$hash{'map_start_'.$uri},'&','','',$short);
         &accinit($uri,$short,$fn);
         &hiddenurls();
     }
@@ -1468,7 +1589,7 @@ sub build_tmp_hashes {
 # ---------------------------------------------------- Store away initial state
     {
         my $cfh;
-        if (open($cfh,">$fn.state")) {
+        if (open($cfh,">","$fn.state")) {
             print $cfh join("\n",@cond);
             $gotstate = 1;
         } else {
@@ -1476,6 +1597,92 @@ sub build_tmp_hashes {
                                      "Could not write statemap $fn for $uri.</font>");
         }
     }
+
+    # Was initial access via a deep-link?
+    my ($cdom,$cnum) = split(/_/,$short);
+    if (($cdom ne '') && ($env{'request.deeplink.login'} ne '')) {
+        my $deeplink_symb = &Apache::loncommon::deeplink_login_symb($cnum,$cdom);
+        if ($deeplink_symb) {
+            my ($loginrid,$deeplink_login_pc,$login_hierarchy);
+            my ($map,$resid,$url) = &Apache::lonnet::decode_symb($deeplink_symb);
+            $loginrid = $hash{'map_pc_'.&Apache::lonnet::clutter($map)}.'.'.$resid;
+            if ($deeplink_symb =~ /\.(page|sequence)$/) {
+                $deeplink_login_pc = $hash{'map_pc_'.&Apache::lonnet::clutter($url)};
+            } else {
+                $deeplink_login_pc = $hash{'map_pc_'.&Apache::lonnet::clutter($map)};
+            }
+            my $deeplink;
+            if ($hash{'deeplinkonly_'.$loginrid} ne '') {
+                my @deeplinkinfo = map { &unescape($_); } split(/:/,$hash{'deeplinkonly_'.$loginrid});
+                unless (@deeplinkinfo < 2) {
+                    $deeplink = $deeplinkinfo[0];
+                }
+            }
+            if ($deeplink) {
+                my $disallow;
+                my ($state,$others,$listed,$scope,$protect) = split(/,/,$deeplink);
+                if (($protect ne 'none') && ($protect ne '')) {
+                    my ($acctype,$item) = split(/:/,$protect);
+                    if ($acctype =~ /lti(c|d)$/) {
+                        unless ($env{'request.linkprot'} eq $item.$1.':'.$env{'request.deeplink.login'}) {
+                            $disallow = 1;
+                        }
+                    } elsif ($acctype eq 'key') {
+                        unless ($env{'request.linkkey'} eq $item) {
+                            $disallow = 1;
+                        }
+                    }
+                }
+                if ($disallow) {
+                    &Apache::lonnet::delenv('request.deeplink.login');
+                    if ($env{'request.deeplink.target'} ne '') {
+                        &Apache::lonnet::delenv('request.deeplink.target');
+                    }
+                } else {
+                    if ($others eq 'hide') {
+                        my @recfolders;
+                        if ($scope eq 'rec') {
+                            foreach my $key (keys(%hash)) {
+                                if ($key=~/^map_hierarchy_(\d+)$/) {
+                                    my $mpc = $1;
+                                    my @ids = split(/,/,$hash{$key});
+                                    if (grep(/^$deeplink_login_pc$/,@ids)) {
+                                        my $idx;
+                                        foreach my $mapid (@ids) {
+                                            if ($idx) {
+                                                push(@recfolders,$mapid);
+                                            } elsif ($mapid == $deeplink_login_pc) {
+                                                push(@recfolders,$mapid);
+                                                $idx = $mapid;
+                                            }
+                                        }
+                                        push(@recfolders,$mpc);
+                                    }
+                                }
+                            }
+                        }
+                        foreach my $key (keys(%hash)) {
+                            if ($key=~/^src_(.+)$/) {
+                                my $rid = $1;
+                                next if ($rid eq '0.0');
+                                next if ($rid eq $loginrid);
+                                if ($scope ne 'res') {
+                                    my $mapid = (split(/\./,$rid))[0];
+                                    next if ($mapid eq $deeplink_login_pc);
+                                    if ($scope eq 'rec') {
+                                        next if (grep(/^$mapid$/,@recfolders));
+                                    }
+                                }
+                                $deeplinkout{$rid} = 1;
+                            }
+                        }
+                    }
+                }
+                &deeplinkouts();
+            }
+        }
+    }
+    &mapcrumbs();
     return $gotstate;
 }
 
@@ -1505,7 +1712,7 @@ sub evalstate {
     if (-e $fn) {
 	my @conditions=();
 	{
-	    open(my $fh,"<$fn");
+	    open(my $fh,"<",$fn);
 	    @conditions=<$fh>;
             close($fh);
 	}  
@@ -1537,6 +1744,165 @@ sub evalstate {
     return $state;
 }
 
+sub get_mapparam {
+    my ($uname,$udom,$cnum,$cdom,$rid,$mapname,$what,$recurseupref) = @_;
+    unless ($mapname) { return; }
+
+# ------------------------------------------------- Get coursedata (if present)
+    my $courseopt=&Apache::lonnet::get_courseresdata($cnum,$cdom);
+    if (!ref($courseopt)) {
+        undef($courseopt);
+    }
+
+# --------------------------------------------------- Get userdata (if present)
+    my $useropt=&Apache::lonnet::get_userresdata($uname,$udom);
+    if (!ref($useropt)) {
+        undef($useropt);
+    }
+
+    my @recurseup;
+    if (ref($recurseupref) eq 'ARRAY') {
+        @recurseup = @{$recurseupref};
+    }
+
+    # Get the section if there is one.
+
+    my $cid = $cdom.'_'.$cnum;
+    my $csec=$env{'request.course.sec'};
+    my $cgroup='';
+    my @cgrps=split(/:/,$env{'request.course.groups'});
+    if (@cgrps > 0) {
+        @cgrps = sort(@cgrps);
+        $cgroup = $cgrps[0];
+    }
+
+    my $rwhat=$what;
+    $what=~s/^parameter\_//;
+    $what=~s/\_/\./;
+
+    # Build the hash keys for the lookup:
+
+    my $mapparm=$mapname.'___(all).'.$what;
+    my $recurseparm=$mapname.'___(rec).'.$what;
+    my $usercourseprefix=$cid;
+
+    my $grplevelm    = "$usercourseprefix.[$cgroup].$mapparm";
+    my $seclevelm    = "$usercourseprefix.[$csec].$mapparm";
+    my $courselevelm = "$usercourseprefix.$mapparm";
+
+    my $grpleveli    = "$usercourseprefix.[$cgroup].$recurseparm";
+    my $secleveli    = "$usercourseprefix.[$csec].$recurseparm";
+    my $courseleveli = "$usercourseprefix.$recurseparm";
+
+    # Check per user
+
+    if ($uname and defined($useropt)) {
+        if (defined($$useropt{$courselevelm})) {
+            return $$useropt{$courselevelm};
+        }
+        if (defined($$useropt{$courseleveli})) {
+            return $$useropt{$courseleveli};
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
+            if (defined($$useropt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return $$useropt{$norecursechk};
+                } else {
+                    last;
+                }
+            }
+        }
+    }
+
+    # Check course -- group
+
+    if ($cgroup ne '' and defined ($courseopt)) {
+        if (defined($$courseopt{$grplevelm})) {
+            return $$courseopt{$grplevelm};
+        }
+        if (defined($$courseopt{$grpleveli})) {
+            return $$courseopt{$grpleveli};
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.['.$cgroup.'].'.$item.'___(all).'.$what;
+            if (defined($$courseopt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return $$courseopt{$norecursechk};
+                } else {
+                    last;
+                }
+            }
+        }
+    }
+
+    # Check course -- section
+
+    if ($csec ne '' and defined($courseopt)) {
+        if (defined($$courseopt{$seclevelm})) {
+            return $$courseopt{$seclevelm};
+        }
+        if (defined($$courseopt{$secleveli})) {
+            return $$courseopt{$secleveli};
+        }
+        foreach my $item (@recurseup) {
+            my $norecursechk=$usercourseprefix.'.['.$csec.'].'.$item.'___(all).'.$what;
+            if (defined($$courseopt{$norecursechk})) {
+                if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                    return $$courseopt{$norecursechk};
+                } else {
+                    last;
+                }
+            }
+        }
+    }
+
+    # Check the map parameters themselves:
+
+    if ($hash{'param_'.$rid}) {
+        my @items = split(/\&/,$hash{'param_'.$rid});
+        my $thisparm;
+        foreach my $item (@items) {
+            my ($esctype,$escname,$escvalue) = ($item =~ /^([^:]+):([^=]+)=(.*)$/);
+            my $name = &unescape($escname);
+            my $value = &unescape($escvalue);
+            if ($name eq $what) {
+                $thisparm = $value;
+                last;
+            }
+        }
+        if (defined($thisparm)) {
+            return $thisparm;
+        }
+    }
+
+   # Additional course parameters:
+
+    if (defined($courseopt)) {
+        if (defined($$courseopt{$courselevelm})) {
+            return $$courseopt{$courselevelm};
+        }
+
+        if (defined($$courseopt{$courseleveli})) {
+            return $$courseopt{$courseleveli};
+        }
+
+        if (@recurseup) {
+            foreach my $item (@recurseup) {
+                my $norecursechk=$usercourseprefix.'.'.$item.'___(all).'.$what;
+                if (defined($$courseopt{$norecursechk})) {
+                    if ($what =~ /\.(encrypturl|hiddenresource)$/) {
+                        return $$courseopt{$norecursechk};
+                    } else {
+                        last;
+                    }
+                }
+            }
+        }
+    }
+    return undef;
+}
+
 #  This block seems to have code to manage/detect doubly defined
 #  aliases in maps.