--- loncom/interface/slotrequest.pm	2005/12/14 22:26:10	1.37
+++ loncom/interface/slotrequest.pm	2006/03/07 21:47:06	1.51
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler for requesting to have slots added to a students record
 #
-# $Id: slotrequest.pm,v 1.37 2005/12/14 22:26:10 raeburn Exp $
+# $Id: slotrequest.pm,v 1.51 2006/03/07 21:47:06 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -34,6 +34,7 @@ use Apache::Constants qw(:common :http :
 use Apache::loncommon();
 use Apache::lonlocal;
 use Apache::lonnet;
+use Apache::lonnavmaps();
 use Date::Manip;
 
 sub fail {
@@ -47,8 +48,7 @@ sub fail {
 	$r->print('<p>'.&mt('Failed.').'</p>');
     }
     
-    $r->print('<p><a href="/adm/flip?postdata=return:">'.
-	      &mt('Return to last resource').'</a></p>');
+    &return_link($r);
     &end_page($r);
 }
 
@@ -89,7 +89,9 @@ sub get_reservation_ids {
 
     my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
 				       "^$slot_name\0");
-    
+    if (&network_error(%consumed)) { 
+	return 'error: Unable to determine current status';
+    }
     my ($tmp)=%consumed;
     if ($tmp=~/^error: 2 / ) {
 	return 0;
@@ -111,7 +113,7 @@ sub space_available {
 }
 
 sub check_for_reservation {
-    my ($symb)=@_;
+    my ($symb,$mode)=@_;
     my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
 				       $env{'user.domain'}, $env{'user.name'});
 
@@ -124,7 +126,19 @@ sub check_for_reservation {
     my ($cnum,$cdom)=&get_course();
     my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
 
-    foreach my $slot_name (@slots) {
+    if (&network_error($student) || &network_error($course)  ||
+	&network_error(%slots)) {
+	return 'error: Unable to determine current status';
+    }    
+    my @got;
+    foreach my $slot_name (sort {
+	if (ref($slots{$a}) && ref($slots{$b})) {
+	    return $slots{$a}{'starttime'} <=> $slots{$b}{'starttime'}
+	}
+	if (ref($slots{$a})) { return -1;}
+	if (ref($slots{$b})) { return 1;}
+	return 0;
+    } @slots) {
 	next if (!defined($slots{$slot_name}) ||
 		 !ref($slots{$slot_name}));
 	&Apache::lonxml::debug(time." $slot_name ".
@@ -133,29 +147,81 @@ sub check_for_reservation {
 	if ($slots{$slot_name}->{'endtime'} > time &&
 	    $slots{$slot_name}->{'startreserve'} < time) {
 	    # between start of reservation times and end of slot
-	    return($slot_name, $slots{$slot_name});
+	    if ($mode eq 'allslots') {
+		push(@got,$slot_name);
+	    } else {
+		return($slot_name, $slots{$slot_name});
+	    }
 	}
     }
+    if ($mode eq 'allslots' && @got) {
+	return @got;
+    }
     return (undef,undef);
 }
 
+sub get_consumed_uniqueperiods {
+    my ($slots) = @_;
+    my $navmap=Apache::lonnavmaps::navmap->new;
+    my @problems = $navmap->retrieveResources(undef,
+					      sub { $_[0]->is_problem() },1,0);
+    my %used_slots;
+    foreach my $problem (@problems) {
+	my $symb = $problem->symb();
+	my $student = &Apache::lonnet::EXT("resource.0.availablestudent",
+					   $symb, $env{'user.domain'},
+					   $env{'user.name'});
+	my $course =  &Apache::lonnet::EXT("resource.0.available",
+					   $symb, $env{'user.domain'},
+					   $env{'user.name'});
+	if (&network_error($student) || &network_error($course)) {
+	    return 'error: Unable to determine current status';
+	}
+	foreach my $slot (split(/:/,$student), split(/:/, $course)) {
+	    $used_slots{$slot}=1;
+	}
+    }
+
+    if (!ref($slots)) {
+	my ($cnum,$cdom)=&get_course();
+	my %slots=&Apache::lonnet::get('slots', [keys(%used_slots)], $cdom, $cnum);
+	if (&network_error(%slots)) {
+	    return 'error: Unable to determine current status';
+	}
+	$slots = \%slots;
+    }
+
+    my %consumed_uniqueperiods;
+    foreach my $slot_name (keys(%used_slots)) {
+	next if (!defined($slots->{$slot_name}) ||
+		 !ref($slots->{$slot_name}));
+	
+        next if (!defined($slots->{$slot_name}{'uniqueperiod'}) ||
+		 !ref($slots->{$slot_name}{'uniqueperiod'}));
+	$consumed_uniqueperiods{$slot_name} = 
+	    $slots->{$slot_name}{'uniqueperiod'};
+    }
+    return \%consumed_uniqueperiods;
+}
+
 sub check_for_conflict {
-    my ($symb,$new_slot_name)=@_;
-    my $student = &Apache::lonnet::EXT("resource.0.availablestudent", $symb,
-				       $env{'user.domain'}, $env{'user.name'});
-    my $course = &Apache::lonnet::EXT("resource.0.available", $symb,
-				      $env{'user.domain'}, $env{'user.name'});
-    my @slots = (split(/:/,$student), split(/:/, $course));
-    my ($cnum,$cdom)=&get_course();
-    my %slots=&Apache::lonnet::get('slots', [@slots], $cdom, $cnum);
-    foreach my $slot_name (@slots) {
-	next if (!defined($slots{$slot_name}) ||
-		 !ref($slots{$slot_name}));
+    my ($symb,$new_slot_name,$new_slot,$slots,$consumed_uniqueperiods)=@_;
+
+    if (!defined($new_slot->{'uniqueperiod'})) { return undef; }
 
-        next if (!defined($slots{$slot_name}->{'uniqueperiod'}) ||
-		 !ref($slots{$slot_name}->{'uniqueperiod'}));
-	my ($start,$end)=@{$slots{$slot_name}->{'uniqueperiod'}};
-	if ($start<time && time < $end) {
+    if (!ref($consumed_uniqueperiods)) {
+	$consumed_uniqueperiods = &get_consumed_uniqueperiods($slots);
+	if (&network_error(%$consumed_uniqueperiods)) {
+	    return 'error: Unable to determine current status';
+	}
+    }
+    
+    my ($new_uniq_start,$new_uniq_end) = @{$new_slot->{'uniqueperiod'}};
+    foreach my $slot_name (keys(%$consumed_uniqueperiods)) {
+	my ($start,$end)=@{$consumed_uniqueperiods->{$slot_name}};
+	if (!
+	    ($start < $new_uniq_start &&  $end < $new_uniq_start) ||
+	    ($start > $new_uniq_end   &&  $end > $new_uniq_end  )) {
 	    return $slot_name;
 	}
     }
@@ -163,6 +229,14 @@ sub check_for_conflict {
 
 }
 
+sub network_error {
+    my ($result) = @_;
+    if ($result =~ /^(con_lost|no_such_host|error: [^2])/) {
+	return 1;
+    }
+    return 0;
+}
+
 sub make_reservation {
     my ($slot_name,$slot,$symb)=@_;
 
@@ -171,11 +245,17 @@ sub make_reservation {
     my $value=&Apache::lonnet::EXT("resource.0.availablestudent",$symb,
 				   $env{'user.domain'},$env{'user.name'});
     &Apache::lonxml::debug("value is  $value<br />");
+    if (&network_error($value)) { 
+	return 'error: Unable to determine current status';
+    }
+
     foreach my $other_slot (split(/:/, $value)) {
 	if ($other_slot eq $slot_name) {
 	    my %consumed=&Apache::lonnet::dump('slot_reservations', $cdom,
 					       $cnum, "^$slot_name\0");   
-
+	    if (&network_error($value)) { 
+		return 'error: Unable to determine current status';
+	    }
 	    my $me=$env{'user.name'}.'@'.$env{'user.domain'};
 	    foreach my $key (keys(%consumed)) {
 		if ($consumed{$key}->{'name'} eq $me) {
@@ -190,7 +270,9 @@ sub make_reservation {
     if (!defined($max)) { $max=99999; }
 
     my (@ids)=&get_reservation_ids($slot_name);
-
+    if (&network_error(@ids)) { 
+	return 'error: Unable to determine current status';
+    }
     my $last=0;
     foreach my $id (@ids) {
 	my $num=(split('\0',$id))[1];
@@ -275,7 +357,16 @@ sub release_slot {
 	&& defined($env{'form.symb'})) {
 	$symb = $env{'form.symb'};
     }
+    my %slot=&Apache::lonnet::get_slot($slot_name);
+    my $description=&get_description($env{'form.slotname'},\%slot);
 
+    if ($mgr ne 'F') {
+	if ($slot{'starttime'} < time) {
+	    $r->print("<p>Not allowed to release Reservation: $description, as it has already ended.  </p>");
+	    &return_link($r);
+	    return 0;
+	}
+    }
     # get parameter string, check for existance, rebuild string with the slot
     my @slots = split(/:/,&Apache::lonnet::EXT("resource.0.availablestudent",
 					       $symb,$udom,$uname));
@@ -302,17 +393,12 @@ sub release_slot {
 						      '0_availablestudent',
 						      1, $new_param, 'string',
 						      $uname,$udom);
-    my %slot=&Apache::lonnet::get_slot($slot_name);
-    my $description=&get_description($env{'form.slotname'},\%slot);
     $r->print("<p>Released Reservation: $description</p>");
     if ($mgr eq 'F') {
 	$r->print('<p><a href="/adm/slotrequest?command=showslots">'.
 		  &mt('Return to slot list').'</a></p>');
     }
-    if (!$inhibit_return_link) {
-	$r->print('<p><a href="/adm/flip?postdata=return:">'.
-		  &mt('Return to last resource').'</a></p>');
-    }
+    if (!$inhibit_return_link) { &return_link($r);  }
     return 1;
 }
 
@@ -325,6 +411,8 @@ sub delete_slot {
     my ($cnum,$cdom)=&get_course();
     my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
 				       "^$slot_name\0");
+    my ($tmp) = %consumed;
+    if ($tmp =~ /error: 2/) { undef(%consumed); }
 
     if (%slot && !%consumed) {
 	$slot{'type'} = 'deleted';
@@ -344,6 +432,11 @@ sub delete_slot {
     }
     $r->print('<p><a href="/adm/slotrequest?command=showslots">'.
 	      &mt('Return to slot list').'</a></p>');
+    &return_link($r);
+}
+
+sub return_link {
+    my ($r) = @_;
     $r->print('<p><a href="/adm/flip?postdata=return:">'.
 	      &mt('Return to last resource').'</a></p>');
 }
@@ -351,7 +444,14 @@ sub delete_slot {
 sub get_slot {
     my ($r,$symb)=@_;
 
-    my $slot_name=&check_for_conflict($symb,$env{'form.slotname'});
+    my %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
+    my $slot_name=&check_for_conflict($symb,$env{'form.slotname'},\%slot);
+
+    if ($slot_name =~ /^error: (.*)/) {
+	$r->print("<p>An error occured while attempting to make a reservation. ($1)</p>");
+	&return_link($r);
+	return;
+    }
     if ($slot_name) {
 	my %slot=&Apache::lonnet::get_slot($slot_name);
 	my $description1=&get_description($slot_name,\%slot);
@@ -372,33 +472,30 @@ STUFF
 STUFF
 	    $r->print(' your reservation from <b>'.$description1.'</b> to <b>'.
 		      $description2.
-		      '</b> <br />or <a href="/adm/flip?postdata=return:">'.
-		      &mt('Return to last resource').'</a></p>');
+		      '</b> <br />or </p>');
+	    &return_link($r);
 	    $r->print(<<STUFF);
 </form>
 STUFF
         } else {
-	    $r->print('<p><a href="/adm/flip?postdata=return:">'.
-		      &mt('Return to last resource').'</a></p>');
+	    &return_link($r);
 	}
 	return;
     }
-    my %slot=&Apache::lonnet::get_slot($env{'form.slotname'});
+
     my $reserved=&make_reservation($env{'form.slotname'},
 				   \%slot,$symb);
     my $description=&get_description($env{'form.slotname'},\%slot);
     if (defined($reserved)) {
-	if ($reserved > -1) {
+	if ($slot_name =~ /^error: (.*)/) {
+	    $r->print("<p>An error occured while attempting to make a reservation. ($1)</p>");
+	} elsif ($reserved > -1) {
 	    $r->print("<p>Success: $description</p>");
-	    $r->print('<p><a href="/adm/flip?postdata=return:">'.
-		      &mt('Return to last resource').'</a></p>');
-	    return;
 	} elsif ($reserved < 0) {
 	    $r->print("<p>Already reserved: $description</p>");
-	    $r->print('<p><a href="/adm/flip?postdata=return:">'.
-		      &mt('Return to last resource').'</a></p>');
-	    return;
 	}
+	&return_link($r);
+	return;
     }
 
     my %lt=('request'=>"Availibility list",
@@ -425,35 +522,78 @@ or
 </p>
 or
 STUFF
-    $r->print('<p><a href="/adm/flip?postdata=return:">'.
-	      &mt('Return to last resource').'</a></p>');
+
+    &return_link($r);
     return;
 }
 
 sub allowed_slot {
-    my ($slot_name,$slot,$symb)=@_;
+    my ($slot_name,$slot,$symb,$slots,$consumed_uniqueperiods)=@_;
+
     #already started
     if ($slot->{'starttime'} < time) {
 	# all open slot to be schedulable
 	#return 0;
     }
     &Apache::lonxml::debug("$slot_name starttime good");
+
     #already ended
     if ($slot->{'endtime'} < time) {
 	return 0;
     }
     &Apache::lonxml::debug("$slot_name endtime good");
+
     # not allowed to pick this one
     if (defined($slot->{'type'})
 	&& $slot->{'type'} ne 'schedulable_student') {
 	return 0;
     }
     &Apache::lonxml::debug("$slot_name type good");
+
+    my $userallowed=0;
+    # its for a different set of users
+    if (defined($slot->{'allowedsections'})) {
+	if (!defined($env{'request.role.sec'})
+	    && grep(/^No section assigned$/,
+		    split(',',$slot->{'allowedsections'}))) {
+	    $userallowed=1;
+	}
+	if (defined($env{'request.role.sec'})
+	    && grep(/^\Q$env{'request.role.sec'}\E$/,
+		    split(',',$slot->{'allowedsections'}))) {
+	    $userallowed=1;
+	}
+    }
+    &Apache::lonxml::debug("$slot_name sections is $userallowed");
+
+    # its for a different set of users
+    if (defined($slot->{'allowedusers'})
+	&& grep(/^\Q$env{'user.name'}:$env{'user.domain'}\E$/,
+		split(',',$slot->{'allowedusers'}))) {
+	$userallowed=1;
+    }
+
+    if (!defined($slot->{'allowedusers'})
+	&& !defined($slot->{'allowedsections'})) {
+	$userallowed=1;
+    }
+
+    &Apache::lonxml::debug("$slot_name user is $userallowed");
+    return 0 if (!$userallowed);
+
     # not allowed for this resource
     if (defined($slot->{'symb'})
 	&& $slot->{'symb'} ne $symb) {
 	return 0;
     }
+
+    my $conflict = &check_for_conflict($symb,$slot_name,$slot,$slots,
+				       $consumed_uniqueperiods);
+    if ($conflict) {
+	if ($slots->{$conflict}{'starttime'} < time) {
+	    return 0;
+	}
+    }
     &Apache::lonxml::debug("$slot_name symb good");
     return 1;
 }
@@ -474,29 +614,39 @@ sub show_choices {
 
     my ($cnum,$cdom)=&get_course();
     my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
+    my $consumed_uniqueperiods = &get_consumed_uniqueperiods(\%slots);
     my $available;
     $r->print('<table border="1">');
     &Apache::lonxml::debug("Checking Slots");
-    my ($got_slot)=&check_for_reservation($symb);
+    my @got_slots=&check_for_reservation($symb,'allslots');
     foreach my $slot (sort 
 		      { return $slots{$a}->{'starttime'} <=> $slots{$b}->{'starttime'} }
 		      (keys(%slots)))  {
 
 	&Apache::lonxml::debug("Checking Slot $slot");
-	next if (!&allowed_slot($slot,$slots{$slot}));
+	next if (!&allowed_slot($slot,$slots{$slot},undef,\%slots,
+				$consumed_uniqueperiods));
 
 	$available++;
 
 	my $description=&get_description($slot,$slots{$slot});
 
 	my $form=&mt('Unavailable');
-	if (($slot eq $got_slot) ||
+	if ((grep(/^\Q$slot\E$/,@got_slots)) ||
 	    &space_available($slot,$slots{$slot},$symb)) {
 	    my $text=&mt('Select');
 	    my $command='get';
-	    if ($slot eq $got_slot) {
+	    if (grep(/^\Q$slot\E$/,@got_slots)) {
 		$text=&mt('Free Reservation');
 		$command='release';
+	    } else {
+		my $conflict = &check_for_conflict($symb,$slot,$slots{$slot},
+						   \%slots,
+						   $consumed_uniqueperiods);
+		if ($conflict) {
+		    $text=&mt('Change Reservation');
+		    $command='get';
+		}
 	    }
 	    my $escsymb=&Apache::lonnet::escape($symb);
 	    $form=<<STUFF;
@@ -615,25 +765,34 @@ sub show_table {
 			       'order'   => 'scalar',
 			       'deleted' => 'scalar',
 			       );
-    &Apache::loncommon::store_course_settings('slotrequest',\%Saveable_Parameters);
-    &Apache::loncommon::restore_course_settings('slotrequest',\%Saveable_Parameters);
+    &Apache::loncommon::store_course_settings('slotrequest',
+					      \%Saveable_Parameters);
+    &Apache::loncommon::restore_course_settings('slotrequest',
+						\%Saveable_Parameters);
+    &Apache::grades::init_perm();
+    my ($classlist,$section,$fullname)=&Apache::grades::getclasslist('all');
+    &Apache::grades::reset_perm();
 
     my %show_fields=&Apache::lonlocal::texthash(
-	     'name'         => 'Slot Name',
-	     'description'  => 'Description',
-	     'type'         => 'Type',
-	     'starttime'    => 'Start time',
-	     'endtime'      => 'End Time',
-             'startreserve' => 'Time students can start reserving',
-	     'secret'       => 'Secret Word',
-	     'maxspace'     => 'Maximum # of students',
-	     'ip'           => 'IP or DNS restrictions',
-	     'symb'         => 'Resource slot is restricted to.',
-	     'uniqueperiod' => 'Period of time slot is unique',
-	     'proctor'      => 'List of proctors');
+	     'name'            => 'Slot Name',
+	     'description'     => 'Description',
+	     'type'            => 'Type',
+	     'starttime'       => 'Start time',
+	     'endtime'         => 'End Time',
+             'startreserve'    => 'Time students can start reserving',
+	     'secret'          => 'Secret Word',
+	     'maxspace'        => 'Maximum # of students',
+	     'ip'              => 'IP or DNS restrictions',
+	     'symb'            => 'Resource slot is restricted to.',
+	     'allowedsections' => 'Sections slot is restricted to.',
+	     'allowedusers'    => 'Users slot is restricted to.',
+	     'uniqueperiod'    => 'Period of time slot is unique',
+	     'scheduled'       => 'Scheduled Students',
+	     'proctor'         => 'List of proctors');
     my @show_order=('name','description','type','starttime','endtime',
-	       'startreserve','secret','maxspace','ip','symb',
-	       'uniqueperiod','proctor');
+		    'startreserve','secret','maxspace','ip','symb',
+		    'allowedsections','allowedusers','uniqueperiod',
+		    'scheduled','proctor');
     my @show = 
 	(exists($env{'form.show'})) ? &Apache::loncommon::get_env_multiple('form.show')
 	                            : keys(%show_fields);
@@ -652,6 +811,16 @@ sub show_table {
     my $when = 	(exists($env{'form.when'})) ? $env{'form.when'}
                                             : 'now';
 
+    my %stu_display_fields=
+	&Apache::lonlocal::texthash('username' => 'User name',
+				    'fullname' => 'Full name',
+				    );
+    my @stu_display_order=('fullname','username');
+    my @stu_display = 
+	(exists($env{'form.studisplay'})) ? &Apache::loncommon::get_env_multiple('form.studisplay')
+	                                  : keys(%stu_display_fields);
+    my %stu_display =  map { $_ => 1 } (@stu_display);
+
     my $hide_radio = 
 	&Apache::lonhtmlcommon::radio('deleted',$env{'form.deleted'},'hide');
     my $show_radio = 
@@ -662,11 +831,17 @@ sub show_table {
     $r->print('<div>');
     $r->print('<table class="inline">
       <tr><th>'.&mt('Show').'</th>
+          <th>'.&mt('Student Display').'</th>
           <th>'.&mt('Open').'</th>
           <th>'.&mt('Options').'</th>
       </tr>
       <tr><td>'.&Apache::loncommon::multiple_select_form('show',\@show,6,\%show_fields,\@show_order).
 	      '</td>
+           <td>
+         '.&Apache::loncommon::multiple_select_form('studisplay',\@stu_display,
+						    6,\%stu_display_fields,
+						    \@stu_display_order).'
+           </td>
            <td>'.&Apache::loncommon::select_form($when,'when',%when_fields).
           '</td>
            <td>
@@ -693,11 +868,10 @@ sub show_table {
 	    $r->print('<th>'.$linkstart.$which.'">'.$show_fields{$which}.'</a></th>');
 	}
     }
-    $r->print('<th>Scheduled Students</th></tr>');
 
     my %name_cache;
     my $slotsort = sub {
-	if ($env{'form.order'}=~/^(type|description|endtime|startreserve|maxspace|ip|symb)$/) {
+	if ($env{'form.order'}=~/^(type|description|endtime|startreserve|maxspace|ip|symb|allowedsections|allowedusers)$/) {
 	    if (lc($slots{$a}->{$env{'form.order'}})
 		ne lc($slots{$b}->{$env{'form.order'}})) {
 		return (lc($slots{$a}->{$env{'form.order'}}) 
@@ -729,16 +903,29 @@ sub show_table {
 	    #next;
 	}
 	my $description=&get_description($slot,$slots{$slot});
-	my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
-					   "^$slot\0");
 	my $ids;
-	foreach my $entry (sort(keys(%consumed))) {
-	    my (undef,$id)=split("\0",$entry);
-	    my ($uname,$udom) = split('@',$consumed{$entry}{'name'});
-	    my $name = &Apache::loncommon::plainname($uname,$udom);
-	    $ids.= '<nobr>'.$name.&remove_link($slot,$entry,$uname,$udom,
-					       $consumed{$entry}{'symb'})
-		.'</nobr><br />';
+	if (exists($show{'scheduled'})) {
+	    my %consumed=&Apache::lonnet::dump('slot_reservations',$cdom,$cnum,
+					       "^$slot\0");
+	    my ($tmp)=%consumed;
+	    if ($tmp !~ /^error: /) {
+		foreach my $entry (sort(keys(%consumed))) {
+		    my (undef,$id)=split("\0",$entry);
+		    my ($uname,$udom) = split('@',$consumed{$entry}{'name'});
+		    $ids.= '<nobr>';
+		    foreach my $item (@stu_display_order) {
+			if ($stu_display{$item}) {
+			    if ($item eq 'fullname') {
+				$ids.=$fullname->{"$uname:$udom"}.' ';
+			    } elsif ($item eq 'username') {
+				$ids.="<tt>$uname\@$udom</tt> ";
+			    }
+			}
+		    }
+		    $ids.=&remove_link($slot,$entry,$uname,$udom,
+				       $consumed{$entry}{'symb'}).'</nobr><br />';
+		}
+	    }
 	}
 
 	my $start=($slots{$slot}->{'starttime'}?
@@ -763,6 +950,28 @@ sub show_table {
 	    $title='<a href="'.$res.'?symb='.$slots{$slot}{'symb'}.'">'.$title.'</a>';
 	}
 
+	my $allowedsections;
+	if (exists($show{'allowedsections'})) {
+	    $allowedsections = 
+		join(', ',sort(split(/\s*,\s*/,
+				     $slots{$slot}->{'allowedsections'})));
+	}
+
+	my @allowedusers;
+	if (exists($show{'allowedusers'})) {
+	    @allowedusers= map {
+		my ($uname,$udom)=split(/:/,$_);
+		my $fullname=$name_cache{$_};
+		if (!defined($fullname)) {
+		    $fullname = &Apache::loncommon::plainname($uname,$udom);
+		    $fullname =~s/\s/&nbsp;/g;
+		    $name_cache{$_} = $fullname;
+		}
+		&Apache::loncommon::aboutmewrapper($fullname,$uname,$udom);
+	    } (sort(split(/\s*,\s*/,$slots{$slot}->{'allowedusers'})));
+	}
+	my $allowedusers=join(', ',@allowedusers);
+	
 	my @proctors;
 	my $rowspan=1;
 	my $colspan=1;
@@ -772,7 +981,6 @@ sub show_table {
 		my ($uname,$udom)=split(/@/,$_);
 		my $fullname=$name_cache{$_};
 		if (!defined($fullname)) {
-		    &Apache::lonnet::logthis("Gettign $uname $udom");
 		    $fullname = &Apache::loncommon::plainname($uname,$udom);
 		    $fullname =~s/\s/&nbsp;/g;
 		    $name_cache{$_} = $fullname;
@@ -822,10 +1030,15 @@ DELETELINK
 	if (exists($show{'symb'})) {
 	    $colspan++;$r->print("<td>$title</td>\n");
 	}
-	if (exists($show{'uniqueperiod'})) {
-	    $colspan++;$r->print("<td>$unique</td>\n");
+	if (exists($show{'allowedsections'})) {
+	    $colspan++;$r->print("<td>$allowedsections</td>\n");
+	}
+	if (exists($show{'allowedusers'})) {
+	    $colspan++;$r->print("<td>$allowedusers</td>\n");
+	}
+	if (exists($show{'scheduled'})) {
+	    $colspan++;$r->print("<td>$ids</td>\n</tr>\n");
 	}
-	$colspan++;$r->print("<td>$ids</td>\n</tr>\n");
 	if (exists($show{'proctor'})) {
 	    $r->print(<<STUFF);
 <tr>
@@ -1006,7 +1219,10 @@ sub csvupload_fields {
 	    ['maxspace','Maximum number of reservations'],
 	    ['symb','Resource Restriction'],
 	    ['uniqueperiod','Date range of slot exclusion'],
-	    ['secret','Secret word proctor uses to validate']);
+	    ['secret','Secret word proctor uses to validate'],
+	    ['allowedsections','Sections slot is restricted to'],
+	    ['allowedusers','Users slot is restricted to'],
+	    );
 }
 
 sub csv_upload_assign {
@@ -1151,8 +1367,9 @@ sub handler {
 	} elsif ($env{'form.command'} eq 'get') {
 	    &get_slot($r,$symb);
 	} elsif ($env{'form.command'} eq 'change') {
-	    &release_slot($r,$symb,$env{'form.releaseslot'},1);
-	    &get_slot($r,$symb);
+	    if (&release_slot($r,$symb,$env{'form.releaseslot'},1)) {
+		&get_slot($r,$symb);
+	    }
 	} else {
 	    $r->print("<p>Unknown command: ".$env{'form.command'}."</p>");
 	}