--- loncom/lonnet/perl/lonnet.pm	2012/03/14 20:53:50	1.1158
+++ loncom/lonnet/perl/lonnet.pm	2012/05/18 20:03:22	1.1170
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1158 2012/03/14 20:53:50 www Exp $
+# $Id: lonnet.pm,v 1.1170 2012/05/18 20:03:22 droeschl Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -96,6 +96,8 @@ use Math::Random;
 use File::MMagic;
 use LONCAPA qw(:DEFAULT :match);
 use LONCAPA::Configuration;
+use LONCAPA::lonmetadata;
+use LONCAPA::Lond;
 
 use File::Copy;
 
@@ -1534,16 +1536,13 @@ sub idput {
 
 # ------------------------------dump from db file owned by domainconfig user
 sub dump_dom {
-    my ($namespace,$udom,$regexp,$range)=@_;
-    if (!$udom) {
-        $udom=$env{'user.domain'};
-    }
-    my %returnhash;
-    if ($udom) {
-        my $uname = &get_domainconfiguser($udom);
-        %returnhash = &dump($namespace,$udom,$uname,$regexp,$range);
-    }
-    return %returnhash;
+    my ($namespace, $udom, $regexp) = @_;
+
+    $udom ||= $env{'user.domain'};
+
+    return () unless $udom;
+
+    return &dump($namespace, $udom, &get_domainconfiguser($udom), $regexp);
 }
 
 # ------------------------------------------ get items from domain db files   
@@ -2157,8 +2156,7 @@ sub getsection {
     # If there is a role which has expired, return it.
     #
     $courseid = &courseid_to_courseurl($courseid);
-    my $extra = &freeze_escape({'skipcheck' => 1});
-    my %roleshash = &dump('roles',$udom,$unam,$courseid,undef,$extra);
+    my %roleshash = &dump('roles',$udom,$unam,$courseid);
     foreach my $key (keys(%roleshash)) {
         next if ($key !~/^\Q$courseid\E(?:\/)*(\w+)*\_st$/);
         my $section=$1;
@@ -2442,7 +2440,7 @@ sub repcopy {
     $filename=~s/\/+/\//g;
     my $londocroot = $perlvar{'lonDocRoot'};
     if ($filename=~m{^\Q$londocroot/adm/\E}) { return 'ok'; }
-    if ($filename=~m{^\Q$londocroot/lonUsers/\E}) { return 'ok'; }
+    if ($filename=~m{^\Q/home/httpd/lonUsers/\E}) { return 'ok'; }
     if ($filename=~m{^\Q$londocroot/userfiles/\E} or
 	$filename=~m{^/*(uploaded|editupload)/}) {
 	return &repcopy_userfile($filename);
@@ -3032,6 +3030,7 @@ sub finishuserfileupload {
 sub extract_embedded_items {
     my ($fullpath,$allfiles,$codebase,$content) = @_;
     my @state = ();
+    my (%lastids,%related,%shockwave,%flashvars);
     my %javafiles = (
                       codebase => '',
                       code => '',
@@ -3061,10 +3060,30 @@ sub extract_embedded_items {
 		&add_filetype($allfiles,$attr->{'href'},'href');
 	    }
             if (lc($tagname) eq 'script') {
+                my $src;
                 if ($attr->{'archive'} =~ /\.jar$/i) {
                     &add_filetype($allfiles,$attr->{'archive'},'archive');
                 } else {
-                    &add_filetype($allfiles,$attr->{'src'},'src');
+                    if ($attr->{'src'} ne '') {
+                        $src = $attr->{'src'};
+                        &add_filetype($allfiles,$src,'src');
+                    }
+                }
+                my $text = $p->get_trimmed_text();
+                if ($text =~ /\Qswfobject.registerObject(\E([^\)]+)\)/) {
+                    my @swfargs = split(/,/,$1);
+                    foreach my $item (@swfargs) {
+                        $item =~ s/["']//g;
+                        $item =~ s/^\s+//;
+                        $item =~ s/\s+$//;
+                    }
+                    if (($swfargs[0] ne'') && ($swfargs[2] ne '')) {
+                        if (ref($related{$swfargs[0]}) eq 'ARRAY') {
+                            push(@{$related{$swfargs[0]}},$swfargs[2]);
+                        } else {
+                            $related{$swfargs[0]} = [$swfargs[2]];
+                        }
+                    }
                 }
             }
             if (lc($tagname) eq 'link') {
@@ -3077,6 +3096,9 @@ sub extract_embedded_items {
 		foreach my $item (keys(%javafiles)) {
 		    $javafiles{$item} = '';
 		}
+                if ((lc($tagname) eq 'object') && (lc($state[-2]) ne 'object')) {
+                    $lastids{lc($tagname)} = $attr->{'id'};
+                }
 	    }
 	    if (lc($state[-2]) eq 'object' && lc($tagname) eq 'param') {
 		my $name = lc($attr->{'name'});
@@ -3086,12 +3108,22 @@ sub extract_embedded_items {
 			last;
 		    }
 		}
+                my $pathfrom;
 		foreach my $item (keys(%mediafiles)) {
 		    if ($name eq $item) {
-			&add_filetype($allfiles, $attr->{'value'}, 'value');
+                        $pathfrom = $attr->{'value'};
+                        $shockwave{$lastids{lc($state[-2])}} = $pathfrom;
+			&add_filetype($allfiles,$pathfrom,$name);
 			last;
 		    }
 		}
+                if ($name eq 'flashvars') {
+                    $flashvars{$lastids{lc($state[-2])}} = $attr->{'value'};
+                }
+                if ($pathfrom ne '') {
+                    &embedded_dependency($allfiles,\%related,$lastids{lc($state[-2])},
+                                         $pathfrom);
+                }
 	    }
 	    if (lc($tagname) eq 'embed' || lc($tagname) eq 'applet') {
 		foreach my $item (keys(%javafiles)) {
@@ -3106,7 +3138,16 @@ sub extract_embedded_items {
 			last;
 		    }
 		}
+                if (lc($tagname) eq 'embed') {
+                    if (($attr->{'name'} ne '') && ($attr->{'src'} ne '')) {
+                        &embedded_dependency($allfiles,\%related,$attr->{'name'},
+                                             $attr->{'src'});
+                    }
+                }
 	    }
+            if ($t->[4] =~ m{/>$}) {
+                pop(@state);  
+            }
 	} elsif ($t->[0] eq 'E') {
 	    my ($tagname) = ($t->[1]);
 	    if ($javafiles{'codebase'} ne '') {
@@ -3126,6 +3167,23 @@ sub extract_embedded_items {
 	    pop @state;
 	}
     }
+    foreach my $id (sort(keys(%flashvars))) {
+        if ($shockwave{$id} ne '') {
+            my @pairs = split(/\&/,$flashvars{$id});
+            foreach my $pair (@pairs) {
+                my ($key,$value) = split(/\=/,$pair);
+                if ($key eq 'thumb') {
+                    &add_filetype($allfiles,$value,$key);
+                } elsif ($key eq 'content') {
+                    my ($path) = ($shockwave{$id} =~ m{^(.+/)[^/]+$});
+                    my ($ext) = ($value =~ /\.([^.]+)$/);
+                    if ($ext ne '') {
+                        &add_filetype($allfiles,$path.$value,$ext);
+                    }
+                }
+            }
+        }
+    }
     return 'ok';
 }
 
@@ -3140,6 +3198,21 @@ sub add_filetype {
     }
 }
 
+sub embedded_dependency {
+    my ($allfiles,$related,$identifier,$pathfrom) = @_;
+    if ((ref($allfiles) eq 'HASH') && (ref($related) eq 'HASH')) {
+        if (($identifier ne '') &&
+            (ref($related->{$identifier}) eq 'ARRAY') &&
+            ($pathfrom ne '')) {
+            my ($path) = ($pathfrom =~ m{^(.+/)[^/]+$});
+            foreach my $dep (@{$related->{$identifier}}) {
+                &add_filetype($allfiles,$path.$dep,'object');
+            }
+        }
+    }
+    return;
+}
+
 sub removeuploadedurl {
     my ($url)=@_;	
     my (undef,undef,$udom,$uname,$fname)=split('/',$url,5);    
@@ -3269,6 +3342,7 @@ sub flushcourselogs {
             }
         } else {
             my ($dom,$name) = ($entry=~m{___($match_domain)/($match_name)/(.*)___(\w+)$});
+            if (($dom eq 'uploaded') || ($dom eq 'adm')) { next; }
             my %temphash=($entry => $accesshash{$entry});
             if (&put('nohist_resevaldata',\%temphash,$dom,$name) eq 'ok') {
                 delete $accesshash{$entry};
@@ -3397,31 +3471,37 @@ sub linklog {
     $accesshash{$from.'___'.$to.'___comefrom'}=1;
     $accesshash{$to.'___'.$from.'___goto'}=1;
 }
+
+sub statslog {
+    my ($symb,$part,$users,$av_attempts,$degdiff)=@_;
+    if ($users<2) { return; }
+    my %dynstore=&LONCAPA::lonmetadata::dynamic_metadata_storage({
+            'course'       => $env{'request.course.id'},
+            'sections'     => '"all"',
+            'num_students' => $users,
+            'part'         => $part,
+            'symb'         => $symb,
+            'mean_tries'   => $av_attempts,
+            'deg_of_diff'  => $degdiff});
+    foreach my $key (keys(%dynstore)) {
+        $accesshash{$key}=$dynstore{$key};
+    }
+}
   
 sub userrolelog {
     my ($trole,$username,$domain,$area,$tstart,$tend)=@_;
-    if (($trole=~/^ca/) || ($trole=~/^aa/) ||
-        ($trole=~/^in/) || ($trole=~/^cc/) ||
-        ($trole=~/^ep/) || ($trole=~/^cr/) ||
-        ($trole=~/^ta/) || ($trole=~/^co/)) {
+    if ( $trole =~ /^(ca|aa|in|cc|ep|cr|ta|co)/ ) {
        my (undef,$rudom,$runame,$rsec)=split(/\//,$area);
        $userrolehash
          {$trole.':'.$username.':'.$domain.':'.$runame.':'.$rudom.':'.$rsec}
                     =$tend.':'.$tstart;
     }
-    if (($env{'request.role'} =~ /dc\./) &&
-	(($trole=~/^au/) || ($trole=~/^in/) ||
-	 ($trole=~/^cc/) || ($trole=~/^ep/) ||
-	 ($trole=~/^cr/) || ($trole=~/^ta/) ||
-         ($trole=~/^co/))) {
+    if ($env{'request.role'} =~ /dc\./ && $trole =~ /^(au|in|cc|ep|cr|ta|co)/) {
        $userrolehash
          {$trole.':'.$username.':'.$domain.':'.$env{'user.name'}.':'.$env{'user.domain'}.':'}
                     =$tend.':'.$tstart;
     }
-    if (($trole=~/^dc/) || ($trole=~/^ad/) ||
-        ($trole=~/^li/) || ($trole=~/^li/) ||
-        ($trole=~/^au/) || ($trole=~/^dg/) ||
-        ($trole=~/^sc/)) {
+    if ($trole =~ /^(dc|ad|li|au|dg|sc)/ ) {
        my (undef,$rudom,$runame,$rsec)=split(/\//,$area);
        $domainrolehash
          {$trole.':'.$username.':'.$domain.':'.$runame.':'.$rudom.':'.$rsec}
@@ -3530,8 +3610,7 @@ sub get_my_roles {
     unless (defined($udom)) { $udom=$env{'user.domain'}; }
     my (%dumphash,%nothide);
     if ($context eq 'userroles') {
-        my $extra = &freeze_escape({'skipcheck' => 1});
-        %dumphash = &dump('roles',$udom,$uname,'.',undef,$extra);
+        %dumphash = &dump('roles',$udom,$uname);
     } else {
         %dumphash=
             &dump('nohist_userroles',$udom,$uname);
@@ -3889,10 +3968,11 @@ sub load_all_first_access {
 }
 
 sub get_first_access {
-    my ($type,$argsymb)=@_;
+    my ($type,$argsymb,$argmap)=@_;
     my ($symb,$courseid,$udom,$uname)=&whichuser();
     if ($argsymb) { $symb=$argsymb; }
     my ($map,$id,$res)=&decode_symb($symb);
+    if ($argmap) { $map = $argmap; }
     if ($type eq 'course') {
 	$res='course';
     } elsif ($type eq 'map') {
@@ -3905,7 +3985,7 @@ sub get_first_access {
 }
 
 sub set_first_access {
-    my ($type)=@_;
+    my ($type,$interval)=@_;
     my ($symb,$courseid,$udom,$uname)=&whichuser();
     my ($map,$id,$res)=&decode_symb($symb);
     if ($type eq 'course') {
@@ -3916,9 +3996,22 @@ sub set_first_access {
 	$res=$symb;
     }
     $cachedkey='';
-    my $firstaccess=&get_first_access($type,$symb);
+    my $firstaccess=&get_first_access($type,$symb,$map);
     if (!$firstaccess) {
-	return &put('firstaccesstimes',{"$courseid\0$res"=>time},$udom,$uname);
+        my $start = time;
+	my $putres = &put('firstaccesstimes',{"$courseid\0$res"=>$start},
+                          $udom,$uname);
+        if ($putres eq 'ok') {
+            &put('timerinterval',{"$courseid\0$res"=>$interval},
+                 $udom,$uname); 
+            &appenv(
+                     {
+                        'course.'.$courseid.'.firstaccess.'.$res   => $start,
+                        'course.'.$courseid.'.timerinterval.'.$res => $interval,
+                     }
+                  );
+        }
+        return $putres;
     }
     return 'already_set';
 }
@@ -4510,95 +4603,127 @@ sub update_released_required {
 
 sub privileged {
     my ($username,$domain)=@_;
-    my $rolesdump=&reply("dump:$domain:$username:roles",
-			&homeserver($username,$domain));
-    if (($rolesdump eq 'con_lost') || ($rolesdump eq '') || 
-        ($rolesdump =~ /^error:/)) {
-        return 0;
-    }
-    my $now=time;
-    if ($rolesdump ne '') {
-        foreach my $entry (split(/&/,$rolesdump)) {
-	    if ($entry!~/^rolesdef_/) {
-		my ($area,$role)=split(/=/,$entry);
-		$area=~s/\_\w\w$//;
-		my ($trole,$tend,$tstart)=split(/_/,$role);
-		if (($trole eq 'dc') || ($trole eq 'su')) {
-		    my $active=1;
-		    if ($tend) {
-			if ($tend<$now) { $active=0; }
-		    }
-		    if ($tstart) {
-			if ($tstart>$now) { $active=0; }
-		    }
-		    if ($active) { return 1; }
-		}
-	    }
+
+    my %rolesdump = &dump("roles", $domain, $username) or return 0;
+    my $now = time;
+
+    for my $role (@rolesdump{grep { ! /^rolesdef_/ } keys %rolesdump}) {
+            my ($trole, $tend, $tstart) = split(/_/, $role);
+            if (($trole eq 'dc') || ($trole eq 'su')) {
+                return 1 unless ($tend && $tend < $now) 
+                    or ($tstart && $tstart > $now);
+            }
 	}
-    }
+
     return 0;
 }
 
 # -------------------------------------------------------- Get user privileges
 
 sub rolesinit {
-    my ($domain,$username,$authhost)=@_;
-    my $now=time;
-    my %userroles = ('user.login.time' => $now);
-    my $extra = &freeze_escape({'skipcheck' => 1});
-    my $rolesdump=reply("dump:$domain:$username:roles:.::$extra",$authhost);
-    if (($rolesdump eq 'con_lost') || ($rolesdump eq '') || 
-        ($rolesdump =~ /^error:/)) {
-        return \%userroles;
+    my ($domain, $username) = @_;
+    my %userroles = ('user.login.time' => time);
+    my %rolesdump = &dump("roles", $domain, $username) or return \%userroles;
+
+    # firstaccess and timerinterval are related to timed maps/resources. 
+    # also, blocking can be triggered by an activating timer
+    # it's saved in the user's %env.
+    my %firstaccess = &dump('firstaccesstimes', $domain, $username);
+    my %timerinterval = &dump('timerinterval', $domain, $username);
+    my (%coursetimerstarts, %firstaccchk, %firstaccenv, %coursetimerintervals,
+        %timerintchk, %timerintenv);
+
+    foreach my $key (keys(%firstaccess)) {
+        my ($cid, $rest) = split(/\0/, $key);
+        $coursetimerstarts{$cid}{$rest} = $firstaccess{$key};
+    }
+
+    foreach my $key (keys(%timerinterval)) {
+        my ($cid,$rest) = split(/\0/,$key);
+        $coursetimerintervals{$cid}{$rest} = $timerinterval{$key};
     }
+
     my %allroles=();
-    my %allgroups=();   
+    my %allgroups=();
 
-    if ($rolesdump ne '') {
-        foreach my $entry (split(/&/,$rolesdump)) {
-	  if ($entry!~/^rolesdef_/) {
-            my ($area,$role)=split(/=/,$entry);
-	    $area=~s/\_\w\w$//;
-            my ($trole,$tend,$tstart,$group_privs);
-	    if ($role=~/^cr/) { 
-		if ($role=~m|^(cr/$match_domain/$match_username/[a-zA-Z0-9]+)_(.*)$|) {
-		    ($trole,my $trest)=($role=~m|^(cr/$match_domain/$match_username/[a-zA-Z0-9]+)_(.*)$|);
-		    ($tend,$tstart)=split('_',$trest);
-		} else {
-		    $trole=$role;
-		}
-            } elsif ($role =~ m|^gr/|) {
-                ($trole,$tend,$tstart) = split(/_/,$role);
-                next if ($tstart eq '-1');
-                ($trole,$group_privs) = split(/\//,$trole);
-                $group_privs = &unescape($group_privs);
-	    } else {
-		($trole,$tend,$tstart)=split(/_/,$role);
-	    }
-	    my %new_role = &set_arearole($trole,$area,$tstart,$tend,$domain,
-					 $username);
-	    @userroles{keys(%new_role)} = @new_role{keys(%new_role)};
-            if (($tend!=0) && ($tend<$now)) { $trole=''; }
-            if (($tstart!=0) && ($tstart>$now)) { $trole=''; }
-            if (($area ne '') && ($trole ne '')) {
-		my $spec=$trole.'.'.$area;
-		my ($tdummy,$tdomain,$trest)=split(/\//,$area);
-		if ($trole =~ /^cr\//) {
-                    &custom_roleprivs(\%allroles,$trole,$tdomain,$trest,$spec,$area);
-                } elsif ($trole eq 'gr') {
-                    &group_roleprivs(\%allgroups,$area,$group_privs,$tend,$tstart);
-		} else {
-                    &standard_roleprivs(\%allroles,$trole,$tdomain,$spec,$trest,$area);
-		}
+    for my $area (grep { ! /^rolesdef_/ } keys %rolesdump) {
+        my $role = $rolesdump{$area};
+        $area =~ s/\_\w\w$//;
+
+        my ($trole, $tend, $tstart, $group_privs);
+
+        if ($role =~ /^cr/) {
+        # Custom role, defined by a user 
+        # e.g., user.role.cr/msu/smith/mynewrole
+            if ($role =~ m|^(cr/$match_domain/$match_username/[a-zA-Z0-9]+)_(.*)$|) {
+                $trole = $1;
+                ($tend, $tstart) = split('_', $2);
+            } else {
+                $trole = $role;
             }
-          }
+        } elsif ($role =~ m|^gr/|) {
+        # Role of member in a group, defined within a course/community
+        # e.g., user.role.gr/msu/04935610a19ee4a5fmsul1/leopards
+            ($trole, $tend, $tstart) = split(/_/, $role);
+            next if $tstart eq '-1';
+            ($trole, $group_privs) = split(/\//, $trole);
+            $group_privs = &unescape($group_privs);
+        } else {
+        # Just a normal role, defined in roles.tab
+            ($trole, $tend, $tstart) = split(/_/,$role);
+        }
+
+        my %new_role = &set_arearole($trole,$area,$tstart,$tend,$domain,
+                 $username);
+        @userroles{keys(%new_role)} = @new_role{keys(%new_role)};
+
+        # role expired or not available yet?
+        $trole = '' if ($tend != 0 && $tend < $userroles{'user.login.time'}) or 
+            ($tstart != 0 && $tstart > $userroles{'user.login.time'});
+
+        next if $area eq '' or $trole eq '';
+
+        my $spec = "$trole.$area";
+        my ($tdummy, $tdomain, $trest) = split(/\//, $area);
+
+        if ($trole =~ /^cr\//) {
+        # Custom role, defined by a user
+            &custom_roleprivs(\%allroles,$trole,$tdomain,$trest,$spec,$area);
+        } elsif ($trole eq 'gr') {
+        # Role of a member in a group, defined within a course/community
+            &group_roleprivs(\%allgroups,$area,$group_privs,$tend,$tstart);
+            next;
+        } else {
+        # Normal role, defined in roles.tab
+            &standard_roleprivs(\%allroles,$trole,$tdomain,$spec,$trest,$area);
+        }
+
+        my $cid = $tdomain.'_'.$trest;
+        unless ($firstaccchk{$cid}) {
+            if (ref($coursetimerstarts{$cid}) eq 'HASH') {
+                foreach my $item (keys(%{$coursetimerstarts{$cid}})) {
+                    $firstaccenv{'course.'.$cid.'.firstaccess.'.$item} = 
+                        $coursetimerstarts{$cid}{$item}; 
+                }
+            }
+            $firstaccchk{$cid} = 1;
+        }
+        unless ($timerintchk{$cid}) {
+            if (ref($coursetimerintervals{$cid}) eq 'HASH') {
+                foreach my $item (keys(%{$coursetimerintervals{$cid}})) {
+                    $timerintenv{'course.'.$cid.'.timerinterval.'.$item} =
+                       $coursetimerintervals{$cid}{$item};
+                }
+            }
+            $timerintchk{$cid} = 1;
         }
-        my ($author,$adv) = &set_userprivs(\%userroles,\%allroles,\%allgroups);
-        $userroles{'user.adv'}    = $adv;
-	$userroles{'user.author'} = $author;
-        $env{'user.adv'}=$adv;
     }
-    return \%userroles;  
+
+    @userroles{'user.author', 'user.adv'} = &set_userprivs(\%userroles,
+        \%allroles, \%allgroups);
+    $env{'user.adv'} = $userroles{'user.adv'};
+
+    return (\%userroles,\%firstaccenv,\%timerintenv);
 }
 
 sub set_arearole {
@@ -4933,16 +5058,17 @@ sub del {
 # -------------------------------------------------------------- dump interface
 
 sub dump {
-    my ($namespace,$udomain,$uname,$regexp,$range,$extra)=@_;
+    my ($namespace,$udomain,$uname,$regexp,$range)=@_;
     if (!$udomain) { $udomain=$env{'user.domain'}; }
     if (!$uname) { $uname=$env{'user.name'}; }
     my $uhome=&homeserver($uname,$udomain);
+
     if ($regexp) {
 	$regexp=&escape($regexp);
     } else {
 	$regexp='.';
     }
-    my $rep=&reply("dump:$udomain:$uname:$namespace:$regexp:$range:$extra",$uhome);
+    my $rep=&reply("dump:$udomain:$uname:$namespace:$regexp:$range",$uhome);
     my @pairs=split(/\&/,$rep);
     my %returnhash=();
     if (!($rep =~ /^error/ )) {
@@ -5979,7 +6105,12 @@ sub allowed {
         if ($match) {
             if ($env{'user.priv.'.$env{'request.role'}.'./'}
                   =~/\Q$priv\E\&([^\:]*)/) {
-                $thisallowed.=$1;
+                my @blockers = &has_comm_blocking($priv,$symb,$uri);
+                if (@blockers > 0) {
+                    $thisallowed = 'B';
+                } else {
+                    $thisallowed.=$1;
+                }
             }
         } else {
             my $refuri = $env{'httpref.'.$orguri} || $env{'httpref.'.$ver_orguri};
@@ -5990,7 +6121,12 @@ sub allowed {
                     $refuri=&declutter($refuri);
                     my ($match) = &is_on_map($refuri);
                     if ($match) {
-                        $thisallowed='F';
+                        my @blockers = &has_comm_blocking($priv,$symb,$refuri);
+                        if (@blockers > 0) {
+                            $thisallowed = 'B';
+                        } else {
+                            $thisallowed='F';
+                        }
                     }
                 }
             }
@@ -6042,7 +6178,17 @@ sub allowed {
            $statecond=$cond;
            if ($env{'user.priv.'.$env{'request.role'}.'./'.$courseprivid}
                =~/\Q$priv\E\&([^\:]*)/) {
-               $thisallowed.=$1;
+               my $value = $1;
+               if ($priv eq 'bre') {
+                   my @blockers = &has_comm_blocking($priv,$symb,$uri);
+                   if (@blockers > 0) {
+                       $thisallowed = 'B';
+                   } else {
+                       $thisallowed.=$value;
+                   }
+               } else {
+                   $thisallowed.=$value;
+               }
                $checkreferer=0;
            }
        }
@@ -6070,7 +6216,17 @@ sub allowed {
               my $refstatecond=$cond;
               if ($env{'user.priv.'.$env{'request.role'}.'./'.$courseprivid}
                   =~/\Q$priv\E\&([^\:]*)/) {
-                  $thisallowed.=$1;
+                  my $value = $1;
+                  if ($priv eq 'bre') {
+                      my @blockers = &has_comm_blocking($priv,$symb,$refuri);
+                      if (@blockers > 0) {
+                          $thisallowed = 'B';
+                      } else {
+                          $thisallowed.=$value;
+                      }
+                  } else {
+                      $thisallowed.=$value;
+                  }
                   $uri=$refuri;
                   $statecond=$refstatecond;
               }
@@ -6229,6 +6385,164 @@ sub allowed {
     }
    return 'F';
 }
+
+sub get_comm_blocks {
+    my ($cdom,$cnum) = @_;
+    if ($cdom eq '' || $cnum eq '') {
+        return unless ($env{'request.course.id'});
+        $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+        $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+    }
+    my %commblocks;
+    my $hashid=$cdom.'_'.$cnum;
+    my ($blocksref,$cached)=&is_cached_new('comm_block',$hashid);
+    if ((defined($cached)) && (ref($blocksref) eq 'HASH')) {
+        %commblocks = %{$blocksref};
+    } else {
+        %commblocks = &Apache::lonnet::dump('comm_block',$cdom,$cnum);
+        my $cachetime = 600;
+        &do_cache_new('comm_block',$hashid,\%commblocks,$cachetime);
+    }
+    return %commblocks;
+}
+
+sub has_comm_blocking {
+    my ($priv,$symb,$uri,$blocks) = @_;
+    return unless ($env{'request.course.id'});
+    return unless ($priv eq 'bre');
+    return if ($env{'user.priv.'.$env{'request.role'}} =~/evb\&([^\:]*)/);
+    my %commblocks;
+    if (ref($blocks) eq 'HASH') {
+        %commblocks = %{$blocks};
+    } else {
+        %commblocks = &get_comm_blocks();
+    }
+    return unless (keys(%commblocks) > 0);
+    if (!$symb) { $symb=&symbread($uri,1); }
+    my ($map,$resid,undef)=&decode_symb($symb);
+    my %tocheck = (
+                    maps      => $map,
+                    resources => $symb,
+                  );
+    my @blockers;
+    my $now = time;
+    my $navmap = Apache::lonnavmaps::navmap->new();
+    foreach my $block (keys(%commblocks)) {
+        if ($block =~ /^(\d+)____(\d+)$/) {
+            my ($start,$end) = ($1,$2);
+            if ($start <= $now && $end >= $now) {
+                if (ref($commblocks{$block}{'blocks'}) eq 'HASH') {
+                    if (ref($commblocks{$block}{'blocks'}{'docs'}) eq 'HASH') {
+                        if (ref($commblocks{$block}{'blocks'}{'docs'}{'maps'}) eq 'HASH') {
+                            if ($commblocks{$block}{'blocks'}{'docs'}{'maps'}{$map}) {
+                                unless (grep(/^\Q$block\E$/,@blockers)) {
+                                    push(@blockers,$block);
+                                }
+                            }
+                        }
+                        if (ref($commblocks{$block}{'blocks'}{'docs'}{'resources'}) eq 'HASH') {
+                            if ($commblocks{$block}{'blocks'}{'docs'}{'resources'}{$symb}) {
+                                unless (grep(/^\Q$block\E$/,@blockers)) {  
+                                    push(@blockers,$block);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        } elsif ($block =~ /^firstaccess____(.+)$/) {
+            my $item = $1;
+            my @to_test;
+            if (ref($commblocks{$block}{'blocks'}) eq 'HASH') {
+                if (ref($commblocks{$block}{'blocks'}{'docs'}) eq 'HASH') {
+                    my $check_interval;
+                    if (&check_docs_block($commblocks{$block}{'blocks'}{'docs'},\%tocheck)) {
+                        my @interval;
+                        my $type = 'map';
+                        if ($item eq 'course') {
+                            $type = 'course';
+                            @interval=&EXT("resource.0.interval");
+                        } else {
+                            if ($item =~ /___\d+___/) {
+                                $type = 'resource';
+                                @interval=&EXT("resource.0.interval",$item);
+                                if (ref($navmap)) {                        
+                                    my $res = $navmap->getBySymb($item); 
+                                    push(@to_test,$res);
+                                }
+                            } else {
+                                my $mapsymb = &symbread($item,1);
+                                if ($mapsymb) {
+                                    if (ref($navmap)) {
+                                        my $mapres = $navmap->getBySymb($mapsymb);
+                                        @to_test = $mapres->retrieveResources($mapres,undef,0,1);
+                                        foreach my $res (@to_test) {
+                                            my $symb = $res->symb();
+                                            next if ($symb eq $mapsymb);
+                                            if ($symb ne '') {
+                                                @interval=&EXT("resource.0.interval",$symb);
+                                                last;
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                        if ($interval[0] =~ /\d+/) {
+                            my $first_access;
+                            if ($type eq 'resource') {
+                                $first_access=&get_first_access($interval[1],$item);
+                            } elsif ($type eq 'map') {
+                                $first_access=&get_first_access($interval[1],undef,$item);
+                            } else {
+                                $first_access=&get_first_access($interval[1]);
+                            }
+                            if ($first_access) {
+                                my $timesup = $first_access+$interval[0];
+                                if ($timesup > $now) {
+                                    foreach my $res (@to_test) {
+                                        if ($res->is_problem()) {
+                                            if ($res->completable()) {
+                                                unless (grep(/^\Q$block\E$/,@blockers)) {
+                                                    push(@blockers,$block);
+                                                }
+                                                last;
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    return @blockers;
+}
+
+sub check_docs_block {
+    my ($docsblock,$tocheck) =@_;
+    if ((ref($docsblock) ne 'HASH') || (ref($tocheck) ne 'HASH')) {
+        return;
+    }
+    if (ref($docsblock->{'maps'}) eq 'HASH') {
+        if ($tocheck->{'maps'}) {
+            if ($docsblock->{'maps'}{$tocheck->{'maps'}}) {
+                return 1;
+            }
+        }
+    }
+    if (ref($docsblock->{'resources'}) eq 'HASH') {
+        if ($tocheck->{'resources'}) {
+            if ($docsblock->{'resources'}{$tocheck->{'resources'}}) {
+                return 1;
+            }
+        }
+    }
+    return;
+}
+
 #
 #   Removes the versino from a URI and
 #   splits it in to its filename and path to the filename.
@@ -6964,8 +7278,7 @@ sub get_users_groups {
     } else {  
         $grouplist = '';
         my $courseurl = &courseid_to_courseurl($courseid);
-        my $extra = &freeze_escape({'skipcheck' => 1});
-        my %roleshash = &dump('roles',$udom,$uname,$courseurl,undef,$extra);
+        my %roleshash = &dump('roles',$udom,$uname,$courseurl);
         my $access_end = $env{'course.'.$courseid.
                               '.default_enrollment_end_date'};
         my $now = time;
@@ -7778,13 +8091,16 @@ sub generate_coursenum {
 }
 
 sub is_course {
-    my ($cdom,$cnum) = @_;
-    my %courses = &courseiddump($cdom,'.',1,'.','.',$cnum,undef,
-				undef,'.');
-    if (exists($courses{$cdom.'_'.$cnum})) {
-        return 1;
-    }
-    return 0;
+    my ($cdom, $cnum) = scalar(@_) == 1 ? 
+         ($_[0] =~ /^($match_domain)_($match_courseid)$/)  :  @_;
+
+    return unless $cdom and $cnum;
+
+    my %courses = &courseiddump($cdom, '.', 1, '.', '.', $cnum, undef, undef,
+        '.');
+
+    return unless exists($courses{$cdom.'_'.$cnum});
+    return wantarray ? ($cdom, $cnum) : $cdom.'_'.$cnum;
 }
 
 sub store_userdata {
@@ -9404,6 +9720,10 @@ sub gettitle {
 	}
 	$title=~s/\&colon\;/\:/gs;
 	if ($title) {
+# Remember both $symb and $title for dynamic metadata
+            $accesshash{$symb.'___crstitle'}=$title;
+            $accesshash{&declutter($map).'___'.&declutter($url).'___usage'}=time;
+# Cache this title and then return it
 	    return &do_cache_new('title',$key,$title,600);
 	}
 	$urlsymb=$url;
@@ -10183,7 +10503,7 @@ sub repcopy_userfile {
     my ($file)=@_;
     my $londocroot = $perlvar{'lonDocRoot'};
     if ($file =~ m{^/*(uploaded|editupload)/}) { $file=&filelocation("",$file); }
-    if ($file =~ m{^\Q$londocroot/lonUsers/\E}) { return 'ok'; }
+    if ($file =~ m{^\Q/home/httpd/lonUsers/\E}) { return 'ok'; }
     my ($cdom,$cnum,$filename) = 
 	($file=~m|^\Q$perlvar{'lonDocRoot'}\E/+userfiles/+($match_domain)/+($match_name)/+(.*)|);
     my $uri="/uploaded/$cdom/$cnum/$filename";
@@ -11358,7 +11678,8 @@ B<idput($udom,%ids)>: store away a list
 
 =item *
 X<rolesinit()>
-B<rolesinit($udom,$username,$authhost)>: get user privileges
+B<rolesinit($udom,$username)>: get user privileges.
+returns user role, first access and timer interval hashes
 
 =item *
 X<getsection()>
@@ -11651,6 +11972,19 @@ createcourse($udom,$description,$url,$co
 
 generate_coursenum($udom,$crstype) : get a unique (unused) course number in domain $udom for course type $crstype (Course or Community).
 
+=item *
+
+is_course($courseid), is_course($cdom, $cnum)
+
+Accepts either a combined $courseid (in the form of domain_courseid) or the
+two component version $cdom, $cnum. It checks if the specified course exists.
+
+Returns:
+    undef if the course doesn't exist, otherwise
+    in scalar context the combined courseid.
+    in list context the two components of the course identifier, domain and 
+    courseid.    
+
 =back
 
 =head2 Resource Subroutines