--- loncom/lonnet/perl/lonnet.pm	2012/03/20 13:36:22	1.1161
+++ loncom/lonnet/perl/lonnet.pm	2012/03/31 23:10:55	1.1162
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1161 2012/03/20 13:36:22 www Exp $
+# $Id: lonnet.pm,v 1.1162 2012/03/31 23:10:55 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -3907,10 +3907,11 @@ 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') {
@@ -3923,7 +3924,7 @@ 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') {
@@ -3934,9 +3935,22 @@ 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 $putres;
     }
     return 'already_set';
 }
@@ -4569,8 +4583,20 @@ sub rolesinit {
         ($rolesdump =~ /^error:/)) {
         return \%userroles;
     }
+    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)) {
@@ -4608,6 +4634,27 @@ sub rolesinit {
 		} else {
                     &standard_roleprivs(\%allroles,$trole,$tdomain,$spec,$trest,$area);
 		}
+                if ($trole ne 'gr') {
+                    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;
+                    }
+                }
             }
           }
         }
@@ -4616,7 +4663,7 @@ sub rolesinit {
 	$userroles{'user.author'} = $author;
         $env{'user.adv'}=$adv;
     }
-    return \%userroles;  
+    return (\%userroles,\%firstaccenv,\%timerintenv);
 }
 
 sub set_arearole {
@@ -5997,7 +6044,12 @@ 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};
@@ -6008,7 +6060,12 @@ 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';
+                        }
                     }
                 }
             }
@@ -6060,7 +6117,17 @@ 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;
            }
        }
@@ -6088,7 +6155,17 @@ 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;
               }
@@ -6247,6 +6324,152 @@ 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;
+    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 = $1;
+            if (ref($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);
+                            } else {
+                                my $mapsymb = &symbread($item,1);
+                                if ($mapsymb) {
+                                    my $navmap = Apache::lonnavmaps::navmap->new();
+                                    if (ref($navmap)) {
+                                        my $mapres = $navmap->getBySymb($mapsymb);
+                                        my @resources = $mapres->retrieveResources($mapres,undef,0,1);
+                                        foreach my $res (@resources) {
+                                            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 > $now) {
+                                    unless (grep(/^\Q$block\E$/,@blockers)) {
+                                        push(@blockers,$block);
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    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.