--- loncom/auth/lonroles.pm 2000/10/05 19:15:34 1.12 +++ loncom/auth/lonroles.pm 2011/02/24 23:29:10 1.260 @@ -1,300 +1,2580 @@ # The LearningOnline Network with CAPA # User Roles Screen -# (Directory Indexer -# (Login Screen -# 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14 Gerd Kortemeyer) -# 11/23 Gerd Kortemeyer) -# 1/14,03/06,06/01,07/22,07/24,07/25, -# 09/04,09/06,09/28,09/29,09/30,10/2,10/5 Gerd Kortemeyer # +# $Id: lonroles.pm,v 1.260 2011/02/24 23:29:10 raeburn Exp $ +# +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# +### + +=pod + +=head1 NAME + +Apache::lonroles - User Roles Screen + +=head1 SYNOPSIS + +Invoked by /etc/httpd/conf/srm.conf: + + + PerlAccessHandler Apache::lonacc + SetHandler perl-script + PerlHandler Apache::lonroles + ErrorDocument 403 /adm/login + ErrorDocument 500 /adm/errorhandler + + +=head1 OVERVIEW + +=head2 Choosing Roles + +C is a handler that allows a user to switch roles in +mid-session. LON-CAPA attempts to work with "No Role Specified", the +default role that a user has before selecting a role, as widely as +possible, but certain handlers for example need specification which +course they should act on, etc. Both in this scenario, and when the +handler determines via C's C<&allowed> function that a certain +action is not allowed, C 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. + +=begin latex + +\begin{figure} +\begin{center} +\includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen} + \caption{\label{Sample_Roles_Screen}Sample Roles Screen} +\end{center} +\end{figure} + +=end latex + +=head2 Role Initialization + +The privileges for a user are established at login time and stored in the session environment. As a consequence, a new role does not become active till the next login. Handlers are able to query for privileges using C's C<&allowed> function. When a user first logs in, their role is the "common" role, which means that they have the sum of all of their privileges. During a session it might become necessary to choose a particular role, which as a consequence also limits the user to only the privileges in that particular role. + +=head1 INTRODUCTION + +This module enables a user to select what role he wishes to +operate under (instructor, student, teaching assistant, course +coordinator, etc). These roles are pre-established by the actions +of upper-level users. + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + +=head1 HANDLER SUBROUTINE + +This routine is called by Apache and mod_perl. + +=over 4 + +=item * + +Roles Initialization (yes/no) + +=item * + +Get Error Message from Environment + +=item * + +Who is this? + +=item * + +Generate Page Output + +=item * + +Choice or no choice + +=item * + +Table + +=item * + +Privileges + +=back + +=cut + + package Apache::lonroles; use strict; -use Apache::lonnet(); +use Apache::lonnet; use Apache::lonuserstate(); use Apache::Constants qw(:common); use Apache::File(); +use Apache::lonmenu; +use Apache::loncommon; +use Apache::lonhtmlcommon; +use Apache::lonannounce; +use Apache::lonlocal; +use Apache::lonpageflip(); +use Apache::lonnavdisplay(); +use Apache::loncoursequeueadmin; +use GDBM_File; +use LONCAPA qw(:DEFAULT :match); +use HTML::Entities; + + +sub redirect_user { + my ($r,$title,$url,$msg) = @_; + $msg = $title if (! defined($msg)); + &Apache::loncommon::content_type($r,'text/html'); + &Apache::loncommon::no_cache($r); + $r->send_http_header; + + # Breadcrumbs + my $brcrum = [{'href' => $url, + 'text' => 'Switching Role'},]; + my $start_page = &Apache::loncommon::start_page('Switching Role',undef, + {'redirect' => [1,$url], + 'bread_crumbs' => $brcrum,}); + my $end_page = &Apache::loncommon::end_page(); + +# Note to style police: +# This must only replace the spaces, nothing else, or it bombs elsewhere. + $url=~s/ /\%20/g; + $r->print(<$msg

+$end_page +ENDREDIR + return; +} + +sub error_page { + my ($r,$error,$dest)=@_; + &Apache::loncommon::content_type($r,'text/html'); + &Apache::loncommon::no_cache($r); + $r->send_http_header; + return OK if $r->header_only; + # Breadcrumbs + my $brcrum = [{'href' => $dest, + 'text' => 'Problems during Course Initialization'},]; + $r->print(&Apache::loncommon::start_page('Problems during Course Initialization', + undef, + {'bread_crumbs' => $brcrum,}) + ); + $r->print( + ''. + '

'.&mt('The following problems occurred:'). + '
'. + $error. + '


'.&mt('Continue').'' + ); + $r->print(&Apache::loncommon::end_page()); +} sub handler { my $r = shift; my $now=time; - my $then=$ENV{'user.login.time'}; - my $envkey; + my $then=$env{'user.login.time'}; + my $refresh=$env{'user.refresh.time'}; + my $update=$env{'user.update.time'}; + if (!$refresh) { + $refresh = $then; + } + if (!$update) { + $update = $then; + } + +# -------------------------------------------------------- Check for new roles + my $updateresult; + if ($env{'form.doupdate'}) { + my $show_course=&Apache::loncommon::show_course(); + my $checkingtxt; + if ($show_course) { + $checkingtxt = &mt('Checking for new courses ...'); + } else { + $checkingtxt = &mt('Checking for new roles ...'); + } + $updateresult = '
'.$checkingtxt.'
'; + $updateresult .= &update_session_roles(); + &Apache::lonnet::appenv({'user.update.time' => $now}); + $update = $now; + } + my $envkey; + my %dcroles = (); + my $numdc = &check_fordc(\%dcroles,$update,$then); + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'}); + my $loncaparev = $Apache::lonnet::perlvar{'lonVersion'}; # ================================================================== Roles Init + if ($env{'form.selectrole'}) { - if ($ENV{'form.selectrole'}) { - foreach $envkey (keys %ENV) { - if ($envkey=~/^user\.role\./) { - my ($dum1,$dum2,$role,@pwhere)=split(/\./,$envkey); - my $where=join('.',@pwhere); - my $trolecode=$role.'.'.$where; - if ($ENV{'form.'.$trolecode}) { - my ($tstart,$tend)=split(/\./,$ENV{$envkey}); - my $tstatus='is'; - if ($tstart) { - if ($tstart>$then) { - $tstatus='future'; - } - } - if ($tend) { - if ($tend<$then) { $tstatus='expired'; } - if ($tend>$now) { $tstatus='will_not'; } - } - if ($tstatus eq 'is') { - &Apache::lonnet::appenv('request.role' => $trolecode); - my ($cdom,$cnum)=split(/\//,$where); - if ($cnum) { - &Apache::lonuserstate::readmap($where); - if ($ENV{'form.orgurl'}) { - $r->internal_redirect($ENV{'form.orgurl'}); - return OK; - } - } - } - } - } + my $locknum=&Apache::lonnet::get_locks(); + if ($locknum) { return 409; } + + if ($env{'form.newrole'}) { + $env{'form.'.$env{'form.newrole'}}=1; + } + if ($env{'request.course.id'}) { + # Check if user is CC trying to select a course role + if ($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 < $update) { + $switch_is_active = 1; + } + } + } + unless ($switch_is_active) { + &adhoc_course_role($refresh,$update,$then); + } + } + my %temp=('logout_'.$env{'request.course.id'} => time); + &Apache::lonnet::put('email_status',\%temp); + &Apache::lonnet::delenv('user.state.'.$env{'request.course.id'}); + } + &Apache::lonnet::appenv({"request.course.id" => '', + "request.course.fn" => '', + "request.course.uri" => '', + "request.course.sec" => '', + "request.role" => 'cm', + "request.role.adv" => $env{'user.adv'}, + "request.role.domain" => $env{'user.domain'}}); +# Check if user is a DC trying to enter a course or author space and needs privs to be created + if ($numdc > 0) { + foreach my $envkey (keys %env) { +# Is this an ad-hoc Coordinator role? + if (my ($ccrole,$domain,$coursenum) = + ($envkey =~ m-^form\.(cc|co)\./($match_domain)/($match_courseid)$-)) { + if ($dcroles{$domain}) { + &Apache::lonnet::check_adhoc_privs($domain,$coursenum, + $update,$refresh,$now,$ccrole); + } + last; + } +# Is this an ad-hoc CA-role? + if (my ($domain,$user) = + ($envkey =~ m-^form\.ca\./($match_domain)/($match_username)$-)) { + if (($domain eq $env{'user.domain'}) && ($user eq $env{'user.name'})) { + delete($env{$envkey}); + $env{'form.au./'.$domain.'/'} = 1; + 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; + $r->internal_redirect($switchserver); + } + last; + } + if (my ($castart,$caend) = ($env{'user.role.ca./'.$domain.'/'.$user} =~ /^(\d*)\.(\d*)$/)) { + if (((($castart) && ($castart < $now)) || !$castart) && + ((!$caend) || (($caend) && ($caend > $now)))) { + my ($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; + $r->internal_redirect($switchserver); + } + last; + } + } + # Check if author blocked ca-access + my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],$domain,$user); + if ($blocked{'domcoord.author'} eq 'blocked') { + delete($env{$envkey}); + $env{'user.error.msg'}=':::1:User '.$user.' in domain '.$domain.' blocked domain coordinator access'; + last; + } + if ($dcroles{$domain}) { + my ($server_status,$home) = &check_author_homeserver($user,$domain); + if (($server_status eq 'ok') || ($server_status eq 'switchserver')) { + &Apache::lonnet::check_adhoc_privs($domain,$user,$update, + $refresh,$now,'ca'); + if ($server_status eq 'switchserver') { + my $trolecode = 'ca./'.$domain.'/'.$user; + my $switchserver = '/adm/switchserver?' + .'otherserver='.$home.'&role='.$trolecode; + $r->internal_redirect($switchserver); + } + } else { + delete($env{$envkey}); + } + } else { + delete($env{$envkey}); + } + last; + } + } + } + + foreach $envkey (keys %env) { + next if ($envkey!~/^user\.role\./); + my ($where,$trolecode,$role,$tstatus,$tend,$tstart); + &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where, + \$trolecode,\$tstatus,\$tstart,\$tend); + if ($env{'form.'.$trolecode}) { + 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'). + '

'); + if ($switchwarning) { + $r->print($switchwarning.'
'); + if (&Apache::loncommon::show_course()) { + $r->print(&mt('Display courses')); + } else { + $r->print(&mt('Display roles')); + } + $r->print(''); + } elsif ($switchserver) { + $r->print(&mt('This course requires a newer version of LON-CAPA than is installed on this server.'). + '
'. + ''. + &mt('Switch Server'). + ''); + } + $r->print('

'.&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); + my $cgrps = join(':',keys(%coursegroups)); + +# store role if recent_role list being kept + if ($env{'environment.recentroles'}) { + my %frozen_roles = + &Apache::lonhtmlcommon::get_recent_frozen('roles',$env{'environment.recentrolesn'}); + &Apache::lonhtmlcommon::store_recent('roles', + $trolecode,' ',$frozen_roles{$trolecode}); + } + + +# check for keyed access + if (($role eq 'st') && + ($env{'course.'.$cdom.'_'.$cnum.'.keyaccess'} eq 'yes')) { +# who is key authority? + my $authdom=$cdom; + my $authnum=$cnum; + if ($env{'course.'.$cdom.'_'.$cnum.'.keyauth'}) { + ($authnum,$authdom)= + split(/:/,$env{'course.'.$cdom.'_'.$cnum.'.keyauth'}); + } +# check with key authority + unless (&Apache::lonnet::validate_access_key( + $env{'environment.key.'.$cdom.'_'.$cnum}, + $authdom,$authnum)) { +# there is no valid key + if ($env{'form.newkey'}) { +# student attempts to register a new key + &Apache::loncommon::content_type($r,'text/html'); + &Apache::loncommon::no_cache($r); + $r->send_http_header; + my $swinfo=&Apache::lonmenu::rawconfig(); + my $start_page=&Apache::loncommon::start_page + ('Verifying Access Key to Unlock this Course'); + my $end_page=&Apache::loncommon::end_page(); + my $buttontext=&mt('Enter Course'); + my $message=&mt('Successfully registered key'); + my $assignresult= + &Apache::lonnet::assign_access_key( + $env{'form.newkey'}, + $authdom,$authnum, + $cdom,$cnum, + $env{'user.domain'}, + $env{'user.name'}, + &mt('Assigned from [_1] at [_2] for [_3]' + ,$ENV{'REMOTE_ADDR'} + ,&Apache::lonlocal::locallocaltime() + ,$trolecode) + ); + unless ($assignresult eq 'ok') { + $assignresult=~s/^error\:\s*//; + $message=&mt($assignresult). + '
'. + &mt('Logout').''; + $buttontext=&mt('Re-Enter Key'); + } + $r->print(< +// + +
+ + +$message
+ +
+$end_page +ENDENTEREDKEY + return OK; + } else { +# print form to enter a new key + &Apache::loncommon::content_type($r,'text/html'); + &Apache::loncommon::no_cache($r); + $r->send_http_header; + my $swinfo=&Apache::lonmenu::rawconfig(); + my $start_page=&Apache::loncommon::start_page + ('Enter Access Key to Unlock this Course'); + my $end_page=&Apache::loncommon::end_page(); + $r->print(< +// + +
+ + + + +
+$end_page +ENDENTERKEY + return OK; + } + } + } + &Apache::lonnet::log($env{'user.domain'}, + $env{'user.name'}, + $env{'user.home'}, + "Role ".$trolecode); + + &Apache::lonnet::appenv( + {'request.role' => $trolecode, + 'request.role.domain' => $cdom, + 'request.course.sec' => $csec, + 'request.course.groups' => $cgrps}); + my $tadv=0; + + if (($cnum) && ($role ne 'ca') && ($role ne 'aa')) { + my $msg; + my ($furl,$ferr)= + &Apache::lonuserstate::readmap($cdom.'/'.$cnum); + if (($env{'form.orgurl'}) && + ($env{'form.orgurl'}!~/^\/adm\/flip/)) { + my $dest=$env{'form.orgurl'}; + if ($env{'form.symb'}) { + if ($dest =~ /\?/) { + $dest .= '&'; + } else { + $dest .= '?' + } + $dest .= 'symb='.$env{'form.symb'}; + } + if (&Apache::lonnet::allowed('adv') eq 'F') { $tadv=1; } + &Apache::lonnet::appenv({'request.role.adv'=>$tadv}); + 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; + } else { + if (!$env{'request.course.id'}) { + &Apache::lonnet::appenv( + {"request.course.id" => $cdom.'_'.$cnum}); + $furl='/adm/roles?tryagain=1'; + $msg='

' + .&mt('Could not initialize [_1] at this time.', + $env{'course.'.$cdom.'_'.$cnum.'.description'}) + .'

' + .'

'.&mt('Please try again.').'

' + .'

'.$ferr.'

'; + } + if (&Apache::lonnet::allowed('adv') eq 'F') { $tadv=1; } + &Apache::lonnet::appenv({'request.role.adv'=>$tadv}); + + if (($ferr) && ($tadv)) { + &error_page($r,$ferr,$furl); + } else { + # Check to see if the user is a CC entering a course + # for the first time + my (undef, undef, $role, $courseid) = split(/\./, $envkey); + if (substr($courseid, 0, 1) eq '/') { + $courseid = substr($courseid, 1); + } + $courseid =~ s/\//_/; + if ((($role eq 'cc') || ($role eq 'co')) + && ($env{'course.' . $courseid .'.course.helper.not.run'})) { + $furl = "/adm/helper/course.initialization.helper"; + # Send the user to the course they selected + } elsif ($env{'request.course.id'}) { + if ($env{'form.destinationurl'}) { + my $dest = $env{'form.destinationurl'}; + if ($env{'form.destsymb'} ne '') { + 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); + return OK; + } + if (&Apache::lonnet::allowed('whn', + $env{'request.course.id'}) + || &Apache::lonnet::allowed('whn', + $env{'request.course.id'}.'/' + .$env{'request.course.sec'}) + ) { + my $startpage = &courseloadpage($courseid); + unless ($startpage eq 'firstres') { + $msg = &mt('Entering [_1] ...', + $env{'course.'.$courseid.'.description'}); + &redirect_user($r, &mt('New in course'), + '/adm/whatsnew?refpage=start', $msg); + return OK; + } + } + } +# Are we allowed to look at the first resource? + if ($furl !~ m|^/adm/|) { +# Guess not ... + $furl=&Apache::lonpageflip::first_accessible_resource(); + } + $msg = &mt('Entering [_1] ...', + $env{'course.'.$courseid.'.description'}); + &redirect_user($r, &mt('Entering [_1]', + $env{'course.'.$courseid.'.description'}), + $furl, $msg); + } + return OK; + } + } + # + # Send the user to the construction space they selected + if ($role =~ /^(au|ca|aa)$/) { + my $redirect_url = '/priv/'; + if ($role eq 'au') { + $redirect_url.=$env{'user.name'}; + } else { + $where =~ /\/(.*)$/; + $redirect_url .= $1; + } + $redirect_url .= '/'; + &redirect_user($r,&mt('Entering Construction Space'), + $redirect_url); + return OK; + } + if ($role eq 'dc') { + my $redirect_url = '/adm/menu/'; + &redirect_user($r,&mt('Loading Domain Coordinator Menu'), + $redirect_url); + return OK; + } + if ($role eq 'sc') { + my $redirect_url = '/adm/grades?command=scantronupload'; + &redirect_user($r,&mt('Loading Data Upload Page'), + $redirect_url); + return OK; + } + } + } } } - + # =============================================================== No Roles Init - $r->content_type('text/html'); + &Apache::loncommon::content_type($r,'text/html'); + &Apache::loncommon::no_cache($r); $r->send_http_header; return OK if $r->header_only; + my $crumbtext = 'User Roles'; + my $pagetitle = 'My Roles'; + my $recent = &mt('Recent Roles'); + my $show_course=&Apache::loncommon::show_course(); + if ($show_course) { + $crumbtext = 'Courses'; + $pagetitle = 'My Courses'; + $recent = &mt('Recent Courses'); + } + my $brcrum =[{href=>"/adm/roles",text=>$crumbtext}]; + my $swinfo=&Apache::lonmenu::rawconfig(); + my $start_page=&Apache::loncommon::start_page($pagetitle,undef,{bread_crumbs=>$brcrum}); + my $standby=&mt('Role selected. Please stand by.'); + $standby=~s/\n/\\n/g; + my $noscript=''.&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.').'
'.&mt('As this is not the case, most functionality in the system will be unavailable.').'
'; + $r->print(< - -LON-CAPA User Roles - +$start_page +
+ + ENDHEADER # ------------------------------------------ Get Error Message from Environment - my ($fn,$priv,$nochoose,$error,$msg)=split(/:/,$ENV{'user.error.msg'}); - if ($ENV{'user.error.msg'}) { - $r->log_reason( - "$msg for $ENV{'user.name'} domain $ENV{'user.domain'} access $priv",$fn); + my ($fn,$priv,$nochoose,$error,$msg)=split(/:/,$env{'user.error.msg'}); + if ($env{'user.error.msg'}) { + $r->log_reason( + "$msg for $env{'user.name'} domain $env{'user.domain'} access $priv",$fn); } -# ---------------------------------------------------------------- Who is this? - - my $advanced=0; - foreach $envkey (keys %ENV) { - if ($envkey=~/^user\.role\./) { - my ($dum1,$dum2,$role,@pwhere)=split(/\./,$envkey); - if ($role ne 'st') { $advanced=1; } - } - } +# ------------------------------------------------- Can this user re-init, etc? -# ---------------------------------------------- Get cached course descriptions - - my %cdes=Apache::lonnet::dump('coursedescriptions'); + my $advanced=$env{'user.adv'}; + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['tryagain']); + my $tryagain=$env{'form.tryagain'}; + my $reinit=$env{'user.reinit'}; + delete $env{'user.reinit'}; # -------------------------------------------------------- Generate Page Output # --------------------------------------------------------------- Error Header? if ($error) { - $r->print("

LON-CAPA Access Control

"); - $r->print("
Access  : ".
-                  Apache::lonnet::plaintext($priv)."\n");
-        $r->print("Resource: $fn\n");
-        $r->print("Action  : $msg\n
"); + $r->print("

".&mt('LON-CAPA Access Control')."

"); + $r->print("
");
+	if ($priv ne '') {
+            $r->print(&mt('Access  : ').&Apache::lonnet::plaintext($priv)."\n");
+	}
+	if ($fn ne '') {
+            $r->print(&mt('Resource: ').&Apache::lonenc::check_encrypt($fn)."\n");
+	}
+	if ($msg ne '') {
+            $r->print(&mt('Action  : ').$msg."\n");
+	}
+	$r->print("
"); + my $url=$fn; + my $last; + if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', + &GDBM_READER(),0640)) { + $last=$hash{'last_known'}; + untie(%hash); + } + if ($last) { $fn.='?symb='.&escape($last); } + + &Apache::londocs::changewarning($r,undef,'You have modified your course recently, [_1] may fix this access problem.', + &Apache::lonenc::check_encrypt($fn)); } else { - $r->print("

LON-CAPA User Roles

"); + if ($env{'user.error.msg'}) { + if ($reinit) { + $r->print( + '

'. + &mt('As your session file for the course or community has expired, you will need to re-select it.').'

'); + } else { + $r->print( + '

'. + &mt('You need to choose another user role or enter a specific course or community for this function.'). + '

'); + } + } } -# -------------------------------------------------------- Choice or no choice? if ($nochoose) { - if ($advanced) { - $r->print("

Assigned User Roles

\n"); - } else { - $r->print("

Sorry ...

\nThis resource might be part of"); - if ($ENV{'request.course.id'}) { - $r->print(' another'); - } else { - $r->print(' a certain'); - } - $r->print(' course.'); - return OK; - } + $r->print("

".&mt('Sorry ...')."

\n". + &mt('This action is currently not authorized.').''. + &Apache::loncommon::end_page()); + return OK; } else { - if ($advanced) { - $r->print("

Select a User Role

\n"); + $r->print($updateresult); + if (($ENV{'REDIRECT_QUERY_STRING'}) && ($fn)) { + $fn.='?'.$ENV{'REDIRECT_QUERY_STRING'}; + } + $r->print('
'); + $r->print(''); + $r->print(''); + $r->print(''); + } + $r->rflush(); + + my (%roletext,%sortrole,%roleclass,%futureroles,%timezones); + my ($countactive,$countfuture,$inrole,$possiblerole) = + &gather_roles($update,$refresh,$now,$reinit,$nochoose,\%roletext,\%sortrole,\%roleclass, + \%futureroles,\%timezones,$loncaparev); + $refresh = $now; + &Apache::lonnet::appenv({'user.refresh.time' => $refresh}); + my $updatebutton = &mt('Check for role changes'); + my $show_course=&Apache::loncommon::show_course(); + if ($show_course) { + $updatebutton = &mt('Check for new courses'); + } + my $do_update; + unless (($env{'form.source'} eq 'login') || ($env{'form.doupdate'})) { + $do_update = ''. + ''; + } + if ($env{'user.adv'}) { + my $showall = '