--- loncom/auth/lonroles.pm	2010/01/18 16:47:17	1.243
+++ loncom/auth/lonroles.pm	2010/08/17 21:35:40	1.256.2.2
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # User Roles Screen
 #
-# $Id: lonroles.pm,v 1.243 2010/01/18 16:47:17 raeburn Exp $
+# $Id: lonroles.pm,v 1.256.2.2 2010/08/17 21:35:40 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -153,10 +153,10 @@ sub redirect_user {
     my $swinfo=&Apache::lonmenu::rawconfig();
     my $navwindow;
     if ($launch_nav eq 'on') {
-	$navwindow.=&Apache::lonnavdisplay::launch_win('now',undef,undef,
-						       ($url =~ m-^/adm/whatsnew-));
+        $navwindow.=&Apache::lonnavdisplay::launch_win('now',undef,undef,
+                                                       ($url =~ m-^/adm/whatsnew-));
     } else {
-	$navwindow.=&Apache::lonnavmaps::close();
+        $navwindow.=&Apache::lonnavmaps::close();
     }
 
     # Breadcrumbs
@@ -225,6 +225,7 @@ sub handler {
     my %dcroles = ();
     my $numdc = &check_fordc(\%dcroles,$then);
     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
+    my $loncaparev = $Apache::lonnet::perlvar{'lonVersion'};
 
 # ================================================================== Roles Init
     if ($env{'form.selectrole'}) {
@@ -238,7 +239,16 @@ sub handler {
 	if ($env{'request.course.id'}) {
             # Check if user is CC trying to select a course role
             if ($env{'form.switchrole'}) {
-                if (!defined($env{'user.role.'.$env{'form.switchrole'}})) {
+                my $switch_is_active;
+                if (defined($env{'user.role.'.$env{'form.switchrole'}})) {
+                    my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.switchrole'}});
+                    if (!$end || $end > $now) {
+                        if (!$start || $start < $refresh) {
+                            $switch_is_active = 1;
+                        }
+                    }
+                }
+                unless ($switch_is_active) {
                     &adhoc_course_role($refresh,$then);
                 }
             }
@@ -274,7 +284,7 @@ sub handler {
                         my ($server_status,$home) = &check_author_homeserver($user,$domain);
                         if ($server_status eq 'switchserver') {
                             my $trolecode = 'au./'.$domain.'/';
-                            my $switchserver = '/adm/switchserver?otherserver='.$home.'&role='.$trolecode;
+                            my $switchserver = '/adm/switchserver?otherserver='.$home.'&amp;role='.$trolecode;
                             $r->internal_redirect($switchserver);
                         }
                         last;
@@ -285,7 +295,7 @@ sub handler {
                             my ($server_status,$home) = &check_author_homeserver($user,$domain);
                             if ($server_status eq 'switchserver') {
                                 my $trolecode = 'ca./'.$domain.'/'.$user;
-                                my $switchserver = '/adm/switchserver?otherserver='.$home.'&role='.$trolecode;
+                                my $switchserver = '/adm/switchserver?otherserver='.$home.'&amp;role='.$trolecode;
                                 $r->internal_redirect($switchserver);
                             }
                             last;
@@ -306,7 +316,7 @@ sub handler {
                             if ($server_status eq 'switchserver') {
                                 my $trolecode = 'ca./'.$domain.'/'.$user; 
                                 my $switchserver = '/adm/switchserver?'
-                                                  .'otherserver='.$home.'&role='.$trolecode;
+                                                  .'otherserver='.$home.'&amp;role='.$trolecode;
                                 $r->internal_redirect($switchserver);
                             }
                         } else {
@@ -329,6 +339,42 @@ sub handler {
 		if ($tstatus eq 'is') {
 		    $where=~s/^\///;
 		    my ($cdom,$cnum,$csec)=split(/\//,$where);
+                    if (($cnum) && ($role ne 'ca') && ($role ne 'aa')) {
+                        my $home = $env{'course.'.$cdom.'_'.$cnum.'.home'};
+                        my @ids = &Apache::lonnet::current_machine_ids();
+                        unless ($loncaparev eq '' && $home && grep(/^\Q$home\E$/,@ids)) {
+                            my %curr_reqd_hash = &Apache::lonnet::userenvironment($cdom,$cnum,'internal.releaserequired');
+                            if ($curr_reqd_hash{'internal.releaserequired'} ne '') {
+                                my ($switchserver,$switchwarning) =
+                                    &check_release_required($loncaparev,$cdom.'_'.$cnum,$trolecode,$curr_reqd_hash{'internal.releaserequired'});
+                                if ($switchwarning ne '' || $switchserver ne '') {
+                                    &Apache::loncommon::content_type($r,'text/html');
+                                    &Apache::loncommon::no_cache($r);
+                                    $r->send_http_header;
+                                    my $end_page=&Apache::loncommon::end_page();
+                                    $r->print(&Apache::loncommon::start_page('Selected course unavailable on this server').
+                                              '<p class="LC_warning">');
+                                    if ($switchwarning) {
+                                        $r->print($switchwarning.'<br /><a href="/adm/roles">');
+                                        if (&Apache::loncommon::show_course()) {
+                                            $r->print(&mt('Display courses'));
+                                        } else {
+                                            $r->print(&mt('Display roles'));
+                                        }
+                                        $r->print('</a>');
+                                    } elsif ($switchserver) {
+				        $r->print(&mt('This course requires a newer version of LON-CAPA than is installed on this server.').
+                                                  '<br />'.
+                                                  '<a href="/adm/switchserver?'.$switchserver.'">'.
+                                                  &mt('Switch Server').
+                                                  '</a>');
+                                    }
+                                    $r->print('</p>'.&Apache::loncommon::end_page());
+                                    return OK;
+                                }
+                            }
+                        }
+                    }
 # check for course groups
                     my %coursegroups = &Apache::lonnet::get_active_groups(
                           $env{'user.domain'},$env{'user.name'},$cdom, $cnum);
@@ -464,6 +510,12 @@ ENDENTERKEY
                             if (($ferr) && ($tadv)) {
 				&error_page($r,$ferr,$dest);
 			    } else {
+                                if ($dest =~ m{^/adm/coursedocs\?folderpath}) {
+                                    if ($env{'request.course.id'} eq $cdom.'_'.$cnum) { 
+                                        my $chome = &Apache::lonnet::homeserver($cnum,$cdom);
+                                        &update_content_constraints($cdom,$cnum,$chome,$cdom.'_'.$cnum);
+                                    }
+                                }
 				$r->internal_redirect($dest);
 			    }
 			    return OK;
@@ -503,10 +555,10 @@ ENDENTERKEY
                                             my $esc_symb = &HTML::Entities::encode($env{'form.destsymb'},'"<>&');
                                             $dest .= '?symb='.$esc_symb;
                                         }
-                                        &redirect_user($r,&mt('Entering [_1]',
-                                                      $env{'course.'.$courseid.'.description'}),
-                                               $dest,$msg,
-                                               $env{'environment.remotenavmap'});
+                                        &redirect_user($r, &mt('Entering [_1]',
+                                                       $env{'course.'.$courseid.'.description'}),
+                                                       $dest, $msg,
+                                                       $env{'environment.remotenavmap'});
                                         return OK;
                                     }
 				    if (&Apache::lonnet::allowed('whn',
@@ -519,9 +571,9 @@ ENDENTERKEY
 					unless ($startpage eq 'firstres') {         
 					    $msg = &mt('Entering [_1] ...',
 						       $env{'course.'.$courseid.'.description'});
-					    &redirect_user($r,&mt('New in course'),
-							   '/adm/whatsnew?refpage=start',$msg,
-							   $env{'environment.remotenavmap'});
+                                            &redirect_user($r,&mt('New in course'),
+                                                           '/adm/whatsnew?refpage=start',$msg,
+                                                           $env{'environment.remotenavmap'});
 					    return OK;
 					}
 				    }
@@ -533,10 +585,10 @@ ENDENTERKEY
 				}
                                 $msg = &mt('Entering [_1] ...',
 					   $env{'course.'.$courseid.'.description'});
-				&redirect_user($r,&mt('Entering [_1]',
-						      $env{'course.'.$courseid.'.description'}),
-					       $furl,$msg,
-					       $env{'environment.remotenavmap'});
+                                &redirect_user($r,&mt('Entering [_1]',
+                                                      $env{'course.'.$courseid.'.description'}),
+                                               $furl,$msg,
+                                               $env{'environment.remotenavmap'});
 			    }
 			    return OK;
 			}
@@ -700,7 +752,7 @@ ENDHEADER
     my (%roletext,%sortrole,%roleclass,%futureroles,%timezones);
     my ($countactive,$countfuture,$inrole,$possiblerole) = 
         &gather_roles($then,$refresh,$now,$reinit,$nochoose,\%roletext,\%sortrole,\%roleclass,
-                      \%futureroles,\%timezones);
+                      \%futureroles,\%timezones,$loncaparev);
 
     $refresh = $now;
     &Apache::lonnet::appenv({'user.refresh.time'  => $refresh});
@@ -770,6 +822,13 @@ ENDHEADER
 	return OK;
     }
 # ----------------------------------------------------------------------- Table
+
+    if ($numdc > 0) {
+        $r->print(&coursepick_jscript());
+        $r->print(&Apache::loncommon::coursebrowser_javascript().
+                  &Apache::loncommon::authorbrowser_javascript());
+    }
+
     unless ((!&Apache::loncommon::show_course()) || ($nochoose) || ($countactive==1)) {
 	$r->print("<h2>".&mt('Select a Course to Enter')."</h2>\n");
     }
@@ -781,28 +840,37 @@ ENDHEADER
                       $env{'form.destsymb'}.'" />');
         }
     }
+
     my $doheaders = &roletable_headers($r,\%roleclass,\%sortrole,$nochoose);
     if ($env{'environment.recentroles'}) {
         my %recent_roles =
                &Apache::lonhtmlcommon::get_recent('roles',$env{'environment.recentrolesn'});
 	my $output='';
-	foreach (sort(keys(%recent_roles))) {
-	    if (ref($roletext{'user.role.'.$_}) eq 'ARRAY') {
+	foreach my $role (sort(keys(%recent_roles))) {
+	    if (ref($roletext{'user.role.'.$role}) eq 'ARRAY') {
 		$output.= &Apache::loncommon::start_data_table_row().
-                          $roletext{'user.role.'.$_}->[0].
-                          &Apache::loncommon::end_data_table_row().
-                          &Apache::loncommon::continue_data_table_row().
-                          $roletext{'user.role.'.$_}->[1].
+                          $roletext{'user.role.'.$role}->[0].
                           &Apache::loncommon::end_data_table_row();
-                if ($_ =~ m-dc\./($match_domain)/- 
+                if ($roletext{'user.role.'.$role}->[1] ne '') {
+                    $output .= &Apache::loncommon::continue_data_table_row().
+                               $roletext{'user.role.'.$role}->[1].
+                               &Apache::loncommon::end_data_table_row();
+                }
+                if ($role =~ m{dc\./($match_domain)/} 
 		    && $dcroles{$1}) {
 		    $output .= &adhoc_roles_row($1,'recent');
                 }
 	    } elsif ($numdc > 0) {
-                unless ($_ =~/^error\:/) {
-                    $output.=&display_cc_role('user.role.'.$_);
+                unless ($role =~/^error\:/) {
+                    my ($roletext,$role_text_end) = &display_cc_role('user.role.'.$role);
+                    $output.= &Apache::loncommon::start_data_table_row().
+                              $roletext.
+                              &Apache::loncommon::end_data_table_row().
+                              &Apache::loncommon::continue_data_table_row().
+                              $role_text_end.
+                              &Apache::loncommon::end_data_table_row();
                 }
-            } 
+            }
 	}
 	if ($output) {
 	    $r->print(&Apache::loncommon::start_data_table_empty_row()
@@ -815,12 +883,6 @@ ENDHEADER
             $doheaders ++;
 	}
     }
-
-    if ($numdc > 0) {
-        $r->print(&coursepick_jscript());
-        $r->print(&Apache::loncommon::coursebrowser_javascript().
-                  &Apache::loncommon::authorbrowser_javascript());
-    }
     &print_rolerows($r,$doheaders,\%roleclass,\%sortrole,\%dcroles,\%roletext);
     if ($countactive > 1) {
         my $tremark='';
@@ -872,13 +934,15 @@ ENDHEADER
 }
 
 sub gather_roles {
-    my ($then,$refresh,$now,$reinit,$nochoose,$roletext,$sortrole,$roleclass,$futureroles,$timezones) = @_;
+    my ($then,$refresh,$now,$reinit,$nochoose,$roletext,$sortrole,$roleclass,$futureroles,$timezones,$loncaparev) = @_;
     my ($countactive,$countfuture,$inrole,$possiblerole) = (0,0,0,'');
     my $advanced = $env{'user.adv'};
     my $tryagain = $env{'form.tryagain'};
+    my @ids = &Apache::lonnet::current_machine_ids();
     foreach my $envkey (sort(keys(%env))) {
         my $button = 1;
         my $switchserver='';
+        my $switchwarning;
         my ($role_text,$role_text_end,$sortkey);
         if ($envkey=~/^user\.role\./) {
             my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus,$tpstart,$tpend);
@@ -928,7 +992,7 @@ sub gather_roles {
                 if ($role =~ /^cr\//) {
                     my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$role);
                     if ($tremark) { $tremark.='<br />'; }
-                    $tremark.=&mt('Defined by [_1] at [_2].',$rauthor,$rdomain);
+                    $tremark.=&mt('Customrole defined by [_1].',$rauthor.':'.$rdomain);
                 }
                 $trole=Apache::lonnet::plaintext($role);
                 my $ttype;
@@ -939,11 +1003,10 @@ sub gather_roles {
                 if (($role eq 'ca') || ($role eq 'aa')) {
                     my $home = &Apache::lonnet::homeserver($trest,$tdom);
                     my $allowed=0;
-                    my @ids=&Apache::lonnet::current_machine_ids();
                     foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
                     if (!$allowed) {
                         $button=0;
-                        $switchserver='otherserver='.$home.'&role='.$trolecode;
+                        $switchserver='otherserver='.$home.'&amp;role='.$trolecode;
                     }
                     #next if ($home eq 'no_host');
                     $home = &Apache::lonnet::hostname($home);
@@ -959,11 +1022,10 @@ sub gather_roles {
                     my $home = &Apache::lonnet::homeserver
                         ($env{'user.name'},$env{'user.domain'});
                     my $allowed=0;
-                    my @ids=&Apache::lonnet::current_machine_ids();
                     foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
                     if (!$allowed) {
                         $button=0;
-                        $switchserver='otherserver='.$home.'&role='.$trolecode;
+                        $switchserver='otherserver='.$home.'&amp;role='.$trolecode;
                     }
                     #next if ($home eq 'no_host');
                     $home = &Apache::lonnet::hostname($home);
@@ -978,24 +1040,43 @@ sub gather_roles {
                     $ttype = &Apache::loncommon::course_type($tcourseid);
                     $trole = &Apache::lonnet::plaintext($role,$ttype,$tcourseid);
                     if ($env{'course.'.$tcourseid.'.description'}) {
+                        my $home=$env{'course.'.$tcourseid.'.home'};
                         $twhere=$env{'course.'.$tcourseid.'.description'};
                         $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
+                        $twhere = &HTML::Entities::encode($twhere,'"<>&');
                         unless ($twhere eq &mt('Currently not available')) {
                             $twhere.=' <span class="LC_fontsize_small">'.
         &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
                                     '</span>';
+                            unless ($home && grep(/^\Q$home\E$/,@ids) && $loncaparev eq '') {
+                                my $required = $env{'course.'.$tcourseid.'.internal.releaserequired'};
+                                ($switchserver,$switchwarning) = 
+                                    &check_release_required($loncaparev,$tcourseid,$trolecode,$required);
+                                if ($switchserver || $switchwarning) {
+                                    $button = 0;
+                                }
+                            }
                         }
                     } else {
                         my %newhash=&Apache::lonnet::coursedescription($tcourseid);
                         if (%newhash) {
                             $sortkey=$role."\0".$tdom."\0".$newhash{'description'}.
                                 "\0".$envkey;
-                            $twhere=$newhash{'description'}.
-                              ' <span class="LC_fontsize_small">'.
-        &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
-                              '</span>';
+                            $twhere=&HTML::Entities::encode($newhash{'description'},'"<>&').
+                                    ' <span class="LC_fontsize_small">'.
+                                     &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
+                                    '</span>';
                             $ttype = $newhash{'type'};
                             $trole = &Apache::lonnet::plaintext($role,$ttype,$tcourseid);
+                            my $home = $newhash{'home'};
+                            unless ($home && grep(/^\Q$home\E$/,@ids) && $loncaparev eq '') {
+                                my $required = $newhash{'internal.releaserequired'};
+                                ($switchserver,$switchwarning) =
+                                    &check_release_required($loncaparev,$tcourseid,$trolecode,$required);
+                                if ($switchserver || $switchwarning) {
+                                    $button = 0;
+                                }
+                            }
                         } else {
                             $twhere=&mt('Currently not available');
                             $env{'course.'.$tcourseid.'.description'}=$twhere;
@@ -1019,7 +1100,7 @@ sub gather_roles {
                 ($role_text,$role_text_end) =
                     &build_roletext($trolecode,$tdom,$trest,$tstatus,$tryagain,
                                     $advanced,$tremark,$tbg,$trole,$twhere,$tpstart,
-                                    $tpend,$nochoose,$button,$switchserver,$reinit);
+                                    $tpend,$nochoose,$button,$switchserver,$reinit,$switchwarning);
                 $roletext->{$envkey}=[$role_text,$role_text_end];
                 if (!$sortkey) {$sortkey=$twhere."\0".$envkey;}
                 $sortrole->{$sortkey}=$envkey;
@@ -1127,10 +1208,12 @@ sub print_rolerows {
                         if (ref($roletext->{$sortrole->{$which}}) eq 'ARRAY') {
                             $output.= &Apache::loncommon::start_data_table_row().
                                       $roletext->{$sortrole->{$which}}->[0].
-                                      &Apache::loncommon::end_data_table_row().
-                                      &Apache::loncommon::continue_data_table_row().
-                                      $roletext->{$sortrole->{$which}}->[1].
                                       &Apache::loncommon::end_data_table_row();
+                            if ($roletext->{$sortrole->{$which}}->[1] ne '') {
+                                $output .= &Apache::loncommon::continue_data_table_row().
+                                           $roletext->{$sortrole->{$which}}->[1].
+                                           &Apache::loncommon::end_data_table_row();
+                            }
                         }
                         if ($sortrole->{$which} =~ m-dc\./($match_domain)/-) {
                             if (ref($dcroles) eq 'HASH') {
@@ -1233,49 +1316,6 @@ sub requestcourse_advice {
     return;
 }
 
-sub queued_selfenrollment {
-    my ($r) = @_;
-    my %selfenrollrequests = &Apache::lonnet::dump('selfenrollrequests');
-    my %reqs_by_date;
-    foreach my $item (keys(%selfenrollrequests)) {
-        if (ref($selfenrollrequests{$item}) eq 'HASH') {
-            if ($selfenrollrequests{$item}{'status'} eq 'request') {
-                if ($selfenrollrequests{$item}{'timestamp'}) {
-                    push(@{$reqs_by_date{$selfenrollrequests{$item}{'timestamp'}}},$item);
-                }
-            } 
-        }
-    }
-    if (keys(%reqs_by_date)) {
-        my $rolename = &Apache::lonnet::plaintext('st');
-        $r->print('<b>'.&mt('Enrollment requests pending Course Coordinator approval').'</b><br />'.
-                  &Apache::loncommon::start_data_table().
-                  &Apache::loncommon::start_data_table_header_row().
-                  '<th>'.&mt('Date requested').'</th><th>'.&mt('Course title').'</th>'.
-                  '<th>'.&mt('User role').'</th><th>'.&mt('Section').'</th>'.
-                 &Apache::loncommon::end_data_table_header_row());
-        my @sorted = sort { $a <=> $b } (keys(%reqs_by_date));
-        foreach my $item (@sorted) {
-            if (ref($reqs_by_date{$item}) eq 'ARRAY') {
-                foreach my $crs (@{$reqs_by_date{$item}}) {
-                    my %courseinfo = &Apache::lonnet::coursedescription($crs);
-                    my $usec = $selfenrollrequests{$crs}{'section'};
-                    if ($usec eq '') {
-                        $usec = &mt('No section'); 
-                    }
-                    $r->print(&Apache::loncommon::start_data_table_row().
-                             '<td>'.&Apache::lonlocal::locallocaltime($item).'</td>'.
-                             '<td>'.$courseinfo{'description'}.'</td>'.
-                             '<td>'.$rolename.'</td><td>'.$usec.'</td>'.
-                             &Apache::loncommon::end_data_table_row());
-                }
-            }
-        }
-        $r->print(&Apache::loncommon::end_data_table());
-    }
-    return;
-}
-
 sub privileges_info {
     my ($which) = @_;
     my $output;
@@ -1332,7 +1372,7 @@ sub privileges_info {
 }
 
 sub build_roletext {
-    my ($trolecode,$tdom,$trest,$tstatus,$tryagain,$advanced,$tremark,$tbg,$trole,$twhere,$tpstart,$tpend,$nochoose,$button,$switchserver,$reinit) = @_;
+    my ($trolecode,$tdom,$trest,$tstatus,$tryagain,$advanced,$tremark,$tbg,$trole,$twhere,$tpstart,$tpend,$nochoose,$button,$switchserver,$reinit,$switchwarning) = @_;
     my ($roletext,$roletext_end);
     my $is_dc=($trolecode =~ m/^dc\./);
     my $rowspan=($is_dc) ? ''
@@ -1350,6 +1390,13 @@ sub build_roletext {
             } else {
                 $roletext.=('<td'.$rowspan.' class="'.$tbg.'">&nbsp;</td>');
             }
+            if ($switchwarning) {
+                if ($tremark eq '') {
+                    $tremark = $switchwarning;
+                } else {
+                    $tremark .= '<br />'.$switchwarning;
+                }
+            }
         } elsif ($tstatus eq 'is') {
             $roletext.='<td'.$rowspan.' class="'.$tbg.'">'.
                         '<input name="'.$buttonname.'" type="button" value="'.
@@ -1530,6 +1577,95 @@ sub check_forcc {
     return $is_cc;
 }
 
+sub check_release_required {
+    my ($loncaparev,$tcourseid,$trolecode,$required) = @_;
+    my ($switchserver,$warning);
+    if ($required ne '') {
+        my ($reqdmajor,$reqdminor) = ($required =~ /^(\d+)\.(\d+)$/);
+        my ($major,$minor) = ($loncaparev =~ /^\'?(\d+)\.(\d+)\.[\w.\-]+\'?$/);
+        if ($reqdmajor ne '' && $reqdminor ne '') {
+            my $otherserver;
+            if (($major eq '' && $minor eq '') || 
+                (($reqdmajor > $major) || (($reqdmajor == $major) && ($reqdminor > $minor)))) {
+                my ($userdomserver) = &Apache::lonnet::choose_server($env{'user.domain'});
+                my $switchlcrev = 
+                    &Apache::lonnet::get_server_loncaparev($env{'user.domain'},
+                                                           $userdomserver);
+                my ($swmajor,$swminor) = ($switchlcrev =~ /^\'?(\d+)\.(\d+)\.[\w.\-]+\'?$/);
+                if (($swmajor eq '' && $swminor eq '') || ($reqdmajor > $swmajor) || 
+                    (($reqdmajor == $swmajor) && ($reqdminor > $swminor))) {
+                    my $cdom = $env{'course.'.$tcourseid.'.domain'};
+                    if ($cdom ne $env{'user.domain'}) {
+                        my ($coursedomserver,$coursehostname) = &Apache::lonnet::choose_server($cdom); 
+                        my $serverhomeID = &Apache::lonnet::get_server_homeID($coursehostname);
+                        my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
+                        my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
+                        my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
+                        my $remoterev = &Apache::lonnet::get_server_loncaparev($serverhomedom,$coursedomserver);
+                        my $canhost =
+                            &Apache::lonnet::can_host_session($env{'user.domain'},
+                                                              $coursedomserver,
+                                                              $remoterev,
+                                                              $udomdefaults{'remotesessions'},
+                                                              $defdomdefaults{'hostedsessions'});
+
+                        if ($canhost) {
+                            $otherserver = $coursedomserver;
+                        } else {
+                            $warning = &mt('Requires LON-CAPA version [_1].',$env{'course.'.$tcourseid.'.internal.releaserequired'}).'<br />'. &mt("No suitable server could be found amongst servers in either your own domain or in the course's domain.");
+                        }
+                    } else {
+                        $warning = &mt('Requires LON-CAPA version [_1].',$env{'course.'.$tcourseid.'.internal.releaserequired'}).'<br />'.&mt("No suitable server could be found amongst servers in your own domain (which is also the course's domain).");
+                    }
+                } else {
+                    $otherserver = $userdomserver;
+                }
+            }
+            if ($otherserver ne '') {
+                $switchserver = 'otherserver='.$otherserver.'&amp;role='.$trolecode;
+            }
+        }
+    }
+    return ($switchserver,$warning);
+}
+
+sub update_content_constraints {
+    my ($cdom,$cnum,$chome,$cid) = @_;
+    my %curr_reqd_hash = &Apache::lonnet::userenvironment($cdom,$cnum,'internal.releaserequired');
+    my ($reqdmajor,$reqdminor) = split(/\./,$curr_reqd_hash{'internal.releaserequired'}); 
+    my %checkresponsetypes;
+    foreach my $key (keys(%Apache::lonnet::needsrelease)) {
+        my ($item,$name,$value) = split(/:/,$key);
+        if ($item eq 'resourcetag') {
+            if ($name eq 'responsetype') {
+                $checkresponsetypes{$value} = $Apache::lonnet::needsrelease{$key}
+            }
+        }
+    }
+    my $navmap = Apache::lonnavmaps::navmap->new();
+    if (defined($navmap)) {
+        my %allresponses;
+        foreach my $res ($navmap->retrieveResources(undef,sub { $_[0]->is_problem() },1,0)) {
+            my %responses = $res->responseTypes();
+            foreach my $key (keys(%responses)) {
+                next unless(exists($checkresponsetypes{$key}));
+                $allresponses{$key} += $responses{$key};
+            }
+        }
+        foreach my $key (keys(%allresponses)) {
+            my ($major,$minor) = split(/\./,$checkresponsetypes{$key});
+            if (($major > $reqdmajor) || ($major == $reqdmajor && $minor > $reqdminor)) { 
+                ($reqdmajor,$reqdminor) = ($major,$minor);
+            } 
+        }
+        undef($navmap);
+    }
+    unless (($reqdmajor eq '') && ($reqdminor eq '')) {
+        &Apache::lonnet::update_released_required($reqdmajor.'.'.$reqdminor,$cdom,$cnum,$chome,$cid);
+    }
+    return;
+}
+
 sub courselink {
     my ($dcdom,$rowtype) = @_;
     my $courseform=&Apache::loncommon::selectcourse_link
@@ -1600,8 +1736,10 @@ sub display_cc_role {
     unless ($rolekey =~/^error\:/) {
         if ($rolekey =~ m{^user\.role\.(cc|co)\./($match_domain)/($match_courseid)$}) {
             my $ccrole = $1;
-            my $tcourseid = $2.'_'.$3;
-            my $trolecode = $1.'./'.$2.'/'.$3;
+            my $tdom = $2;
+            my $trest = $3;
+            my $tcourseid = $tdom.'_'.$trest;
+            my $trolecode = $ccrole.'./'.$tdom.'/'.$trest;
             my $twhere;
             my $ttype;
             my $tbg='LC_roles_is';
@@ -1609,7 +1747,7 @@ sub display_cc_role {
             if (%newhash) {
                 $twhere=$newhash{'description'}.
                         ' <span style="LC_fontsize_small">'.
-                        &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$2,$1).
+                        &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
                         '</span>';
                 $ttype = $newhash{'type'};
             } else {
@@ -1618,7 +1756,7 @@ sub display_cc_role {
             }
             my $trole = &Apache::lonnet::plaintext($ccrole,$ttype,$tcourseid);
             $twhere.="<br />".&mt('Domain').":".$1;
-            ($roletext,$roletext_end) = &build_roletext($trolecode,$1,$2,'is',$tryagain,$advanced,'',$tbg,$trole,$twhere,'','','',1,'');
+            ($roletext,$roletext_end) = &build_roletext($trolecode,$tdom,$trest,'is',$tryagain,$advanced,'',$tbg,$trole,$twhere,'','','',1,'');
         }
     }
     return ($roletext,$roletext_end);
@@ -1636,7 +1774,7 @@ sub adhoc_roles_row {
     my $carole = &Apache::lonnet::plaintext('ca');
     my $selectcalink = &coauthorlink($dcdom,$rowtype);
     $output.=$ccrole.': '.$selectcclink
-            .' | '.$carole.': '.$selectcalink
+            .' | '.$carole.': '.$selectcalink.'</td>'
             .&Apache::loncommon::end_data_table_row();
     return $output;
 }
@@ -1695,7 +1833,7 @@ handler determines via C<lonnet>'s C<&al
 action is not allowed, C<lonroles> is used as error handler. This
 allows the user to select another role which may have permission to do
 what they were trying to do. C<lonroles> can also be accessed via the
-B<CRS> button in the Remote Control. 
+B<CRS> button in the Remote Control.
 
 =begin latex