1: # The LearningOnline Network with CAPA
2: # User Roles Screen
3: #
4: # $Id: lonroles.pm,v 1.240.2.21 2010/12/05 16:35:58 raeburn Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ###
29:
30: =pod
31:
32: =head1 NAME
33:
34: Apache::lonroles - User Roles Screen
35:
36: =head1 SYNOPSIS
37:
38: Invoked by /etc/httpd/conf/srm.conf:
39:
40: <Location /adm/roles>
41: PerlAccessHandler Apache::lonacc
42: SetHandler perl-script
43: PerlHandler Apache::lonroles
44: ErrorDocument 403 /adm/login
45: ErrorDocument 500 /adm/errorhandler
46: </Location>
47:
48: =head1 OVERVIEW
49:
50: =head2 Choosing Roles
51:
52: C<lonroles> is a handler that allows a user to switch roles in
53: mid-session. LON-CAPA attempts to work with "No Role Specified", the
54: default role that a user has before selecting a role, as widely as
55: possible, but certain handlers for example need specification which
56: course they should act on, etc. Both in this scenario, and when the
57: handler determines via C<lonnet>'s C<&allowed> function that a certain
58: action is not allowed, C<lonroles> is used as error handler. This
59: allows the user to select another role which may have permission to do
60: what they were trying to do. C<lonroles> can also be accessed via the
61: B<CRS> button in the Remote Control.
62:
63: =begin latex
64:
65: \begin{figure}
66: \begin{center}
67: \includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen}
68: \caption{\label{Sample_Roles_Screen}Sample Roles Screen}
69: \end{center}
70: \end{figure}
71:
72: =end latex
73:
74: =head2 Role Initialization
75:
76: 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<lonnet>'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.
77:
78: =head1 INTRODUCTION
79:
80: This module enables a user to select what role he wishes to
81: operate under (instructor, student, teaching assistant, course
82: coordinator, etc). These roles are pre-established by the actions
83: of upper-level users.
84:
85: This is part of the LearningOnline Network with CAPA project
86: described at http://www.lon-capa.org.
87:
88: =head1 HANDLER SUBROUTINE
89:
90: This routine is called by Apache and mod_perl.
91:
92: =over 4
93:
94: =item *
95:
96: Roles Initialization (yes/no)
97:
98: =item *
99:
100: Get Error Message from Environment
101:
102: =item *
103:
104: Who is this?
105:
106: =item *
107:
108: Generate Page Output
109:
110: =item *
111:
112: Choice or no choice
113:
114: =item *
115:
116: Table
117:
118: =item *
119:
120: Privileges
121:
122: =back
123:
124: =cut
125:
126:
127: package Apache::lonroles;
128:
129: use strict;
130: use Apache::lonnet;
131: use Apache::lonuserstate();
132: use Apache::Constants qw(:common);
133: use Apache::File();
134: use Apache::lonmenu;
135: use Apache::loncommon;
136: use Apache::lonhtmlcommon;
137: use Apache::lonannounce;
138: use Apache::lonlocal;
139: use Apache::lonpageflip();
140: use Apache::lonnavdisplay();
141: use Apache::loncoursequeueadmin;
142: use GDBM_File;
143: use LONCAPA qw(:DEFAULT :match);
144: use HTML::Entities;
145:
146:
147: sub redirect_user {
148: my ($r,$title,$url,$msg,$launch_nav) = @_;
149: $msg = $title if (! defined($msg));
150: &Apache::loncommon::content_type($r,'text/html');
151: &Apache::loncommon::no_cache($r);
152: $r->send_http_header;
153: my $swinfo=&Apache::lonmenu::rawconfig();
154: my $navwindow;
155: if ($launch_nav eq 'on') {
156: $navwindow.=&Apache::lonnavdisplay::launch_win('now',undef,undef,
157: ($url =~ m-^/adm/whatsnew-));
158: } else {
159: $navwindow.=&Apache::lonnavmaps::close();
160: }
161:
162: # Breadcrumbs
163: my $brcrum = [{'href' => $url,
164: 'text' => 'Switching Role'},];
165: my $start_page = &Apache::loncommon::start_page('Switching Role',undef,
166: {'redirect' => [1,$url],
167: 'bread_crumbs' => $brcrum,});
168: &Apache::lonhtmlcommon::clear_breadcrumbs();
169: my $end_page = &Apache::loncommon::end_page();
170:
171: # Note to style police:
172: # This must only replace the spaces, nothing else, or it bombs elsewhere.
173: $url=~s/ /\%20/g;
174: $r->print(<<ENDREDIR);
175: $start_page
176: <script type="text/javascript">
177: // <![CDATA[
178: $swinfo
179: // ]]>
180: </script>
181: $navwindow
182: <p>$msg</p>
183: $end_page
184: ENDREDIR
185: return;
186: }
187:
188: sub error_page {
189: my ($r,$error,$dest)=@_;
190: &Apache::loncommon::content_type($r,'text/html');
191: &Apache::loncommon::no_cache($r);
192: $r->send_http_header;
193: return OK if $r->header_only;
194: # Breadcrumbs
195: my $brcrum = [{'href' => $dest,
196: 'text' => 'Problems during Course Initialization'},];
197: $r->print(&Apache::loncommon::start_page('Problems during Course Initialization',
198: undef,
199: {'bread_crumbs' => $brcrum,})
200: );
201: $r->print(
202: '<script type="text/javascript">'.
203: '// <![CDATA['.
204: &Apache::lonmenu::rawconfig().
205: '// ]]>'.
206: '</script>'.
207: '<p class="LC_error">'.&mt('The following problems occurred:').
208: '<br />'.
209: $error.
210: '</p><br /><a href="'.$dest.'">'.&mt('Continue').'</a>'
211: );
212: $r->print(&Apache::loncommon::end_page());
213: }
214:
215: sub handler {
216:
217: my $r = shift;
218:
219: my $now=time;
220: my $then=$env{'user.login.time'};
221: my $refresh=$env{'user.refresh.time'};
222: if (!$refresh) {
223: $refresh = $then;
224: }
225: my $envkey;
226: my %dcroles = ();
227: my $numdc = &check_fordc(\%dcroles,$then);
228: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
229: my $custommenu = &Apache::loncommon::needs_gci_custom();
230:
231: # ================================================================== Roles Init
232: if ($env{'form.selectrole'}) {
233:
234: my $locknum=&Apache::lonnet::get_locks();
235: if ($locknum) { return 409; }
236:
237: if ($env{'form.newrole'}) {
238: $env{'form.'.$env{'form.newrole'}}=1;
239: }
240: if ($env{'request.course.id'}) {
241: # Check if user is CC trying to select a course role
242: if ($env{'form.switchrole'}) {
243: if (!defined($env{'user.role.'.$env{'form.switchrole'}})) {
244: &adhoc_course_role($refresh,$then);
245: }
246: }
247: my %temp=('logout_'.$env{'request.course.id'} => time);
248: &Apache::lonnet::put('email_status',\%temp);
249: &Apache::lonnet::delenv('user.state.'.$env{'request.course.id'});
250: }
251: &Apache::lonnet::appenv({"request.course.id" => '',
252: "request.course.fn" => '',
253: "request.course.uri" => '',
254: "request.course.sec" => '',
255: "request.role" => 'cm',
256: "request.role.adv" => $env{'user.adv'},
257: "request.role.domain" => $env{'user.domain'}});
258: # Check if user is a DC trying to enter a course or author space and needs privs to be created
259: if ($numdc > 0) {
260: foreach my $envkey (keys %env) {
261: # Is this an ad-hoc Coordinator role?
262: if (my ($ccrole,$domain,$coursenum) =
263: ($envkey =~ m-^form\.(cc|co)\./($match_domain)/($match_courseid)$-)) {
264: if ($dcroles{$domain}) {
265: &Apache::lonnet::check_adhoc_privs($domain,$coursenum,
266: $then,$refresh,$now,$ccrole);
267: }
268: last;
269: }
270: # Is this an ad-hoc CA-role?
271: if (my ($domain,$user) =
272: ($envkey =~ m-^form\.ca\./($match_domain)/($match_username)$-)) {
273: if (($domain eq $env{'user.domain'}) && ($user eq $env{'user.name'})) {
274: delete($env{$envkey});
275: $env{'form.au./'.$domain.'/'} = 1;
276: my ($server_status,$home) = &check_author_homeserver($user,$domain);
277: if ($server_status eq 'switchserver') {
278: my $trolecode = 'au./'.$domain.'/';
279: my $switchserver = '/adm/switchserver?otherserver='.$home.'&role='.$trolecode;
280: $r->internal_redirect($switchserver);
281: }
282: last;
283: }
284: if (my ($castart,$caend) = ($env{'user.role.ca./'.$domain.'/'.$user} =~ /^(\d*)\.(\d*)$/)) {
285: if (((($castart) && ($castart < $now)) || !$castart) &&
286: ((!$caend) || (($caend) && ($caend > $now)))) {
287: my ($server_status,$home) = &check_author_homeserver($user,$domain);
288: if ($server_status eq 'switchserver') {
289: my $trolecode = 'ca./'.$domain.'/'.$user;
290: my $switchserver = '/adm/switchserver?otherserver='.$home.'&role='.$trolecode;
291: $r->internal_redirect($switchserver);
292: }
293: last;
294: }
295: }
296: # Check if author blocked ca-access
297: my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],$domain,$user);
298: if ($blocked{'domcoord.author'} eq 'blocked') {
299: delete($env{$envkey});
300: $env{'user.error.msg'}=':::1:User '.$user.' in domain '.$domain.' blocked domain coordinator access';
301: last;
302: }
303: if ($dcroles{$domain}) {
304: my ($server_status,$home) = &check_author_homeserver($user,$domain);
305: if (($server_status eq 'ok') || ($server_status eq 'switchserver')) {
306: &Apache::lonnet::check_adhoc_privs($domain,$user,$then,
307: $refresh,$now,'ca');
308: if ($server_status eq 'switchserver') {
309: my $trolecode = 'ca./'.$domain.'/'.$user;
310: my $switchserver = '/adm/switchserver?'
311: .'otherserver='.$home.'&role='.$trolecode;
312: $r->internal_redirect($switchserver);
313: }
314: } else {
315: delete($env{$envkey});
316: }
317: } else {
318: delete($env{$envkey});
319: }
320: last;
321: }
322: }
323: }
324: if (($env{'form.cm'}) && ($env{'form.orgurl'})) {
325: $r->internal_redirect($env{'form.orgurl'});
326: }
327: foreach $envkey (keys %env) {
328: next if ($envkey!~/^user\.role\./);
329: my ($where,$trolecode,$role,$tstatus,$tend,$tstart);
330: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
331: \$trolecode,\$tstatus,\$tstart,\$tend);
332: if ($env{'form.'.$trolecode}) {
333: if ($tstatus eq 'is') {
334: $where=~s/^\///;
335: my ($cdom,$cnum,$csec)=split(/\//,$where);
336: # check for course groups
337: my %coursegroups = &Apache::lonnet::get_active_groups(
338: $env{'user.domain'},$env{'user.name'},$cdom, $cnum);
339: my $cgrps = join(':',keys(%coursegroups));
340:
341: # store role if recent_role list being kept
342: if ($env{'environment.recentroles'}) {
343: my %frozen_roles =
344: &Apache::lonhtmlcommon::get_recent_frozen('roles',$env{'environment.recentrolesn'});
345: &Apache::lonhtmlcommon::store_recent('roles',
346: $trolecode,' ',$frozen_roles{$trolecode});
347: }
348:
349:
350: # check for keyed access
351: if (($role eq 'st') &&
352: ($env{'course.'.$cdom.'_'.$cnum.'.keyaccess'} eq 'yes')) {
353: # who is key authority?
354: my $authdom=$cdom;
355: my $authnum=$cnum;
356: if ($env{'course.'.$cdom.'_'.$cnum.'.keyauth'}) {
357: ($authnum,$authdom)=
358: split(/:/,$env{'course.'.$cdom.'_'.$cnum.'.keyauth'});
359: }
360: # check with key authority
361: unless (&Apache::lonnet::validate_access_key(
362: $env{'environment.key.'.$cdom.'_'.$cnum},
363: $authdom,$authnum)) {
364: # there is no valid key
365: if ($env{'form.newkey'}) {
366: # student attempts to register a new key
367: &Apache::loncommon::content_type($r,'text/html');
368: &Apache::loncommon::no_cache($r);
369: $r->send_http_header;
370: my $swinfo=&Apache::lonmenu::rawconfig();
371: my $start_page=&Apache::loncommon::start_page
372: ('Verifying Access Key to Unlock this Course');
373: my $end_page=&Apache::loncommon::end_page();
374: my $buttontext=&mt('Enter Course');
375: my $message=&mt('Successfully registered key');
376: my $assignresult=
377: &Apache::lonnet::assign_access_key(
378: $env{'form.newkey'},
379: $authdom,$authnum,
380: $cdom,$cnum,
381: $env{'user.domain'},
382: $env{'user.name'},
383: &mt('Assigned from [_1] at [_2] for [_3]'
384: ,$ENV{'REMOTE_ADDR'}
385: ,&Apache::lonlocal::locallocaltime()
386: ,$trolecode)
387: );
388: unless ($assignresult eq 'ok') {
389: $assignresult=~s/^error\:\s*//;
390: $message=&mt($assignresult).
391: '<br /><a href="/adm/logout">'.
392: &mt('Logout').'</a>';
393: $buttontext=&mt('Re-Enter Key');
394: }
395: $r->print(<<ENDENTEREDKEY);
396: $start_page
397: <script type="text/javascript">
398: // <![CDATA[
399: $swinfo
400: // ]]>
401: </script>
402: <form action="" method="post">
403: <input type="hidden" name="selectrole" value="1" />
404: <input type="hidden" name="$trolecode" value="1" />
405: <span class="LC_fontsize_large">$message</span><br />
406: <input type="submit" value="$buttontext" />
407: </form>
408: $end_page
409: ENDENTEREDKEY
410: return OK;
411: } else {
412: # print form to enter a new key
413: &Apache::loncommon::content_type($r,'text/html');
414: &Apache::loncommon::no_cache($r);
415: $r->send_http_header;
416: my $swinfo=&Apache::lonmenu::rawconfig();
417: my $start_page=&Apache::loncommon::start_page
418: ('Enter Access Key to Unlock this Course');
419: my $end_page=&Apache::loncommon::end_page();
420: $r->print(<<ENDENTERKEY);
421: $start_page
422: <script type="text/javascript">
423: // <![CDATA[
424: $swinfo
425: // ]]>
426: </script>
427: <form action="" method="post">
428: <input type="hidden" name="selectrole" value="1" />
429: <input type="hidden" name="$trolecode" value="1" />
430: <input type="text" size="20" name="newkey" value="$env{'form.newkey'}" />
431: <input type="submit" value="Enter key" />
432: </form>
433: $end_page
434: ENDENTERKEY
435: return OK;
436: }
437: }
438: }
439: &Apache::lonnet::log($env{'user.domain'},
440: $env{'user.name'},
441: $env{'user.home'},
442: "Role ".$trolecode);
443:
444: &Apache::lonnet::appenv(
445: {'request.role' => $trolecode,
446: 'request.role.domain' => $cdom,
447: 'request.course.sec' => $csec,
448: 'request.course.groups' => $cgrps});
449: my $tadv=0;
450:
451: if (($cnum) && ($role ne 'ca') && ($role ne 'aa')) {
452: my $msg;
453: if (&Apache::lonnet::allowed('adv') eq 'F') { $tadv=1; }
454: &Apache::lonnet::appenv({'request.role.adv'=>$tadv});
455: my ($furl,$ferr)=
456: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
457: if ($custommenu) {
458: unless (($ferr) || ($env{'form.switchrole'})) {
459: &Apache::lonnet::put('nohist_crslastlogin',{$env{'user.name'}.':'.$env{'user.domain'}.':'.$csec.':'.$role => $now},
460: $cdom,$cnum);
461: }
462: }
463: if (($env{'form.orgurl'}) &&
464: ($env{'form.orgurl'}!~/^\/adm\/flip/)) {
465: my $dest=$env{'form.orgurl'};
466: if ($env{'form.symb'}) {
467: if ($dest =~ /\?/) {
468: $dest .= '&';
469: } else {
470: $dest .= '?'
471: }
472: $dest .= 'symb='.$env{'form.symb'};
473: }
474: if (($ferr) && ($tadv)) {
475: &error_page($r,$ferr,$dest);
476: } else {
477: $r->internal_redirect($dest);
478: }
479: return OK;
480: } else {
481: if (!$env{'request.course.id'}) {
482: &Apache::lonnet::appenv(
483: {"request.course.id" => $cdom.'_'.$cnum});
484: $furl='/adm/roles?tryagain=1';
485: $msg='<p><span class="LC_error">'
486: .&mt('Could not initialize [_1] at this time.',
487: $env{'course.'.$cdom.'_'.$cnum.'.description'})
488: .'</span></p>'
489: .'<p>'.&mt('Please try again.').'</p>'
490: .'<p>'.$ferr.'</p>';
491: }
492:
493: if (($ferr) && ($tadv)) {
494: &error_page($r,$ferr,$furl);
495: } else {
496: # Check to see if the user is a CC entering a course
497: # for the first time
498: my (undef, undef, $role, $courseid) = split(/\./, $envkey);
499: if (substr($courseid, 0, 1) eq '/') {
500: $courseid = substr($courseid, 1);
501: }
502: $courseid =~ s/\//_/;
503: if (($cdom !~ /^\w+citest$/) && (($role eq 'cc') || ($role eq 'co'))
504: && ($env{'course.' . $courseid .'.course.helper.not.run'})) {
505: $furl = "/adm/helper/course.initialization.helper";
506: # Send the user to the course they selected
507: } elsif ($env{'request.course.id'}) {
508: if ($env{'form.destinationurl'}) {
509: my $dest = $env{'form.destinationurl'};
510: if ($env{'form.destsymb'} ne '') {
511: my $esc_symb = &HTML::Entities::encode($env{'form.destsymb'},'"<>&');
512: $dest .= '?symb='.$esc_symb;
513: }
514: &redirect_user($r,&mt('Entering [_1]',
515: $env{'course.'.$courseid.'.description'}),
516: $dest,$msg,
517: $env{'environment.remotenavmap'});
518: return OK;
519: }
520: if (&Apache::lonnet::allowed('whn',
521: $env{'request.course.id'})
522: || &Apache::lonnet::allowed('whn',
523: $env{'request.course.id'}.'/'
524: .$env{'request.course.sec'})
525: ) {
526: my $startpage = &courseloadpage($courseid);
527: unless (($startpage eq 'firstres') || ($cdom =~ /^\w+citest$/)) {
528: $msg = &mt('Entering [_1] ...',
529: $env{'course.'.$courseid.'.description'});
530: &redirect_user($r,&mt('New in course'),
531: '/adm/whatsnew?refpage=start',$msg,
532: $env{'environment.remotenavmap'});
533: return OK;
534: }
535: }
536: }
537: # Are we allowed to look at the first resource?
538: if ($furl !~ m|^/adm/|) {
539: # Guess not ...
540: $furl=&Apache::lonpageflip::first_accessible_resource();
541: }
542: if (($cdom =~ /^\w+citest$/) && ($custommenu)) {
543: $furl = '/adm/navmaps';
544: }
545: $msg = &mt('Entering [_1] ...',
546: $env{'course.'.$courseid.'.description'});
547: &redirect_user($r,&mt('Entering [_1]',
548: $env{'course.'.$courseid.'.description'}),
549: $furl,$msg,
550: $env{'environment.remotenavmap'});
551: }
552: return OK;
553: }
554: }
555: #
556: # Send the user to the construction space they selected
557: if ($role =~ /^(au|ca|aa)$/) {
558: my $redirect_url = '/priv/';
559: if ($role eq 'au') {
560: $redirect_url.=$env{'user.name'};
561: } else {
562: $where =~ /\/(.*)$/;
563: $redirect_url .= $1;
564: }
565: $redirect_url .= '/';
566: &redirect_user($r,&mt('Entering Construction Space'),
567: $redirect_url);
568: return OK;
569: }
570: if ($role eq 'dc') {
571: my $redirect_url = '/adm/menu/';
572: &redirect_user($r,&mt('Loading Domain Coordinator Menu'),
573: $redirect_url);
574: return OK;
575: }
576: if ($role eq 'sc') {
577: my $redirect_url = '/adm/grades?command=scantronupload';
578: &redirect_user($r,&mt('Loading Data Upload Page'),
579: $redirect_url);
580: return OK;
581: }
582: }
583: }
584: }
585: }
586:
587: # =============================================================== No Roles Init
588:
589: &Apache::loncommon::content_type($r,'text/html');
590: &Apache::loncommon::no_cache($r);
591: $r->send_http_header;
592: return OK if $r->header_only;
593:
594: my ($crumbtext,$pagetitle,$recent,$show_course);
595: $show_course=&Apache::loncommon::show_course();
596: my $noscript='<br /><span class="LC_error">'.&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.').'<br />'.&mt('As this is not the case, most functionality in the system will be unavailable.').'</span><br />';
597: if ($custommenu) {
598: my $start_page = &Apache::loncommon::start_page('Main Menu');
599: $r->print(<<"ENDCUSTOM");
600: $start_page
601: <noscript>
602: $noscript
603: </noscript>
604: ENDCUSTOM
605: } else {
606: $crumbtext = 'User Roles';
607: $pagetitle = 'My Roles';
608: $recent = &mt('Recent Roles');
609: my $standby=&mt('Role selected. Please stand by.');
610: if ($show_course) {
611: $crumbtext = 'Courses';
612: $pagetitle = 'My Courses';
613: $recent = &mt('Recent Courses');
614: $standby = &mt('Course selected. Please stand by.');
615: }
616: my $brcrum = [{ href => '/adm/roles',
617: text => $crumbtext,},
618: ];
619: my $args;
620: if ($numdc) {
621: $args = {bread_crumbs => $brcrum};
622: } else {
623: $args = {bread_crumbs => $brcrum,
624: bread_crumbs_menulink => '_nomenu'};
625: }
626: my $start_page=&Apache::loncommon::start_page($pagetitle,undef,$args);
627: my $swinfo=&Apache::lonmenu::rawconfig();
628: $standby=~s/\n/\\n/g;
629: $r->print(<<ENDHEADER);
630: $start_page
631: <noscript>
632: $noscript
633: </noscript>
634: <script type="text/javascript">
635: // <![CDATA[
636: $swinfo
637: window.focus();
638:
639: active=true;
640:
641: function enterrole (thisform,rolecode,buttonname) {
642: if (active) {
643: active=false;
644: document.title='$standby';
645: window.status='$standby';
646: thisform.newrole.value=rolecode;
647: thisform.submit();
648: } else {
649: alert('$standby');
650: }
651: }
652: // ]]>
653: </script>
654: ENDHEADER
655: }
656:
657: # ------------------------------------------ Get Error Message from Environment
658:
659: my ($fn,$priv,$nochoose,$error,$msg)=split(/:/,$env{'user.error.msg'});
660: if ($env{'user.error.msg'}) {
661: $r->log_reason(
662: "$msg for $env{'user.name'} domain $env{'user.domain'} access $priv",$fn);
663: }
664:
665: # ------------------------------------------------- Can this user re-init, etc?
666:
667: my $advanced=$env{'user.adv'};
668: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['tryagain']);
669: my $tryagain=$env{'form.tryagain'};
670: my $reinit=$env{'user.reinit'};
671: delete $env{'user.reinit'};
672:
673: # -------------------------------------------------------- Generate Page Output
674: # --------------------------------------------------------------- Error Header?
675: if ($error) {
676: $r->print("<h1>".&mt('LON-CAPA Access Control')."</h1>");
677: $r->print("<!-- LONCAPAACCESSCONTROLERRORSCREEN --><hr /><pre>");
678: if ($priv ne '') {
679: $r->print(&mt('Access : ').&Apache::lonnet::plaintext($priv)."\n");
680: }
681: if ($fn ne '') {
682: $r->print(&mt('Resource: ').&Apache::lonenc::check_encrypt($fn)."\n");
683: }
684: if ($msg ne '') {
685: $r->print(&mt('Action : ').$msg."\n");
686: }
687: $r->print("</pre><hr />");
688: my $url=$fn;
689: my $last;
690: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
691: &GDBM_READER(),0640)) {
692: $last=$hash{'last_known'};
693: untie(%hash);
694: }
695: if ($last) { $fn.='?symb='.&escape($last); }
696:
697: &Apache::londocs::changewarning($r,undef,'You have modified your course recently, [_1] may fix this access problem.',
698: &Apache::lonenc::check_encrypt($fn));
699: } else {
700: if ($env{'user.error.msg'}) {
701: if ($reinit) {
702: $r->print(
703: '<h3><span class="LC_error">'.
704: &mt('As your session file for the course or community has expired, you will need to re-select it.').'</span></h3>');
705: } else {
706: $r->print(
707: '<h3><span class="LC_error">'.
708: &mt('You need to choose another user role or enter a specific course or community for this function.').
709: '</span></h3>');
710: }
711: }
712: }
713: # -------------------------------------------------------- Choice or no choice?
714: if ($nochoose) {
715: $r->print("<h2>".&mt('Sorry ...')."</h2>\n<span class='LC_error'>".
716: &mt('This action is currently not authorized.').'</span>'.
717: &Apache::loncommon::end_page());
718: return OK;
719: } else {
720: if (($ENV{'REDIRECT_QUERY_STRING'}) && ($fn)) {
721: $fn.='?'.$ENV{'REDIRECT_QUERY_STRING'};
722: }
723: unless ($custommenu) {
724: $r->print('<form method="post" name="rolechoice" action="'.(($fn)?$fn:$r->uri).'">');
725: $r->print('<input type="hidden" name="orgurl" value="'.$fn.'" />');
726: $r->print('<input type="hidden" name="selectrole" value="1" />');
727: $r->print('<input type="hidden" name="newrole" value="" />');
728: }
729: }
730:
731: my (%roletext,%sortrole,%roleclass,%futureroles,%timezones);
732: my ($countactive,$countfuture,$inrole,$possiblerole) =
733: &gather_roles($then,$refresh,$now,$reinit,$nochoose,\%roletext,\%sortrole,\%roleclass,
734: \%futureroles,\%timezones);
735:
736: $refresh = $now;
737: &Apache::lonnet::appenv({'user.refresh.time' => $refresh});
738: if (!$countactive && !$countfuture) {
739: if (&Apache::loncommon::new_roles_update()) {
740: ($countactive,$countfuture,$inrole,$possiblerole) =
741: &gather_roles($then,$refresh,$now,$reinit,$nochoose,\%roletext,\%sortrole,
742: \%roleclass,\%futureroles,\%timezones);
743: }
744: }
745: if ($custommenu) {
746: if ($env{'form.destinationurl'} eq '/adm/gci_info') {
747: $r->print(&gci_info_page()).
748: &Apache::loncommon::end_page();
749: return OK;
750: }
751: my %courses = &Apache::loncommon::existing_gcitest_courses('cc');
752: $env{'browser.interface'}='faketextual';
753: $env{'environment.remote'}='off';
754: my $numcourses = keys(%courses);
755: my $switcher;
756: if ($numcourses > 0) {
757: $switcher = &Apache::loncommon::gcitest_switcher('cc',%courses);
758: }
759: $r->print(&Apache::lonmenu::inlinemenu('gcicustom',$switcher).
760: &Apache::loncommon::end_page());
761: return OK;
762: } else {
763: if ($env{'form.destinationurl'} eq '/adm/gci_info') {
764: delete($env{'form.destinationurl'});
765: }
766: }
767: if ($env{'user.adv'}) {
768: $r->print('<p><label><input type="checkbox" name="showall"');
769: if ($env{'form.showall'}) { $r->print(' checked="checked" '); }
770: $r->print(' />'.&mt('Show all roles').'</label>'
771: .' <input type="submit" value="'.&mt('Update display').'" />'
772: .'</p>');
773: } else {
774: if ($countactive > 0) {
775: $r->print(&Apache::loncoursequeueadmin::queued_selfenrollment());
776: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
777: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
778: unless ($env{'user.domain'} =~ /^\w+citest$/) {
779: $r->print(
780: '<p>'
781: .&mt('[_1]Visit the [_2]Course/Community Catalog[_3]'
782: .' to view all [_4] LON-CAPA courses and communities.'
783: ,'<b>'
784: ,'<a href="/adm/coursecatalog?showdom='.$esc_dom.'">'
785: ,'</a></b>',$domdesc)
786: .'<br />'
787: .&mt('If a course or community is [_1]not[_2] in your list of current courses and communities below,'
788: .' you may be able to enroll if self-enrollment is permitted.'
789: ,'<b>','</b>')
790: .'</p>'
791: );
792: }
793: }
794: }
795:
796: # No active roles
797: if ($countactive==0) {
798: if ($inrole) {
799: $r->print('<h2>'.&mt('Currently no additional roles, courses or communities').'</h2>');
800: } else {
801: if ($show_course) {
802: if ($env{'user.domain'} =~ /^\w+citest$/) {
803: $r->print('<h2>'.&mt('Currently no active Concept Tests').'</h2>');
804: } elsif ($env{'user.domain'} =~ /ci$/) {
805: $r->print('<h2>'.&mt('Currently not assigned as a GCI contributor').'</h2>');
806: }
807: } else {
808: $r->print('<h2>'.&mt('Currently no active roles, courses or communities').'</h2>');
809: }
810: }
811: unless ($env{'user.domain'} =~ /^\w+citest$/) {
812: &findcourse_advice($r);
813: &requestcourse_advice($r);
814: }
815: $r->print('</form>');
816: if ($countfuture) {
817: if ($show_course) {
818: if ($env{'user.domain'} =~ /^\w+citest$/) {
819: $r->print(&mt('The following [quant,_1,Concept Test] will be available in the future:',$countfuture));
820: } else {
821: $r->print(&mt('The following [quant,_1,course] will become active in the future:',$countfuture));
822: }
823: } else {
824: $r->print(&mt('The following [quant,_1,role,roles] will become active in the future:',$countfuture));
825: }
826: my $doheaders = &roletable_headers($r,\%roleclass,\%sortrole,
827: $nochoose);
828: &print_rolerows($r,$doheaders,\%roleclass,\%sortrole,\%dcroles,
829: \%roletext);
830: my $tremark='';
831: my $tbg;
832: if ($env{'request.role'} eq 'cm') {
833: $tbg="LC_roles_selected";
834: $tremark=&mt('Currently selected.').' ';
835: } else {
836: $tbg="LC_roles_is";
837: }
838: $r->print(&Apache::loncommon::start_data_table_row()
839: .'<td class="'.$tbg.'"> </td>'
840: .'<td colspan="3">'
841: .&mt('No role specified')
842: .'</td>'
843: .'<td>'.$tremark.' </td>'
844: .&Apache::loncommon::end_data_table_row()
845: );
846:
847: $r->print(&Apache::loncommon::end_data_table());
848: }
849: $r->print(&Apache::loncommon::end_page());
850: return OK;
851: } elsif ($countactive==1) { # Is there only one choice?
852: my $needs_switchserver;
853: if ($env{'user.author'}) {
854: $needs_switchserver = &check_needs_switchserver($possiblerole);
855: }
856: if ((!$needs_switchserver) && ($env{'request.role'} eq 'cm')) {
857: $r->print('<h3>'.&mt('Please stand by.').'</h3>'.
858: '<input type="hidden" name="'.$possiblerole.'" value="1" />'.
859: '<noscript><br /><input type="submit" name="submit" value="'.&mt('Continue').'" /></noscript>');
860: $r->print("</form>\n");
861: $r->rflush();
862: $r->print('<script type="text/javascript">document.forms.rolechoice.submit();</script>');
863: $r->print(&Apache::loncommon::end_page());
864: return OK;
865: }
866: if ($needs_switchserver) {
867: $r->print("<h2>".&mt('Server Switch Required')."</h2>\n".
868: &mt('Construction Space access is only available from '.
869: 'the home server of the corresponding Author.').'<br />'.
870: &mt("Click the 'Switch Server' link to go there.").'<br />');
871: }
872: }
873: # ----------------------------------------------------------------------- Table
874: unless ((!$show_course) || ($nochoose) || ($countactive==1)) {
875: $r->print("<h2>".&mt('Select a Course to Enter')."</h2>\n");
876: }
877: if ($env{'form.destinationurl'}) {
878: $r->print('<input type="hidden" name="destinationurl" value="'.
879: $env{'form.destinationurl'}.'" />');
880: if ($env{'form.destsymb'} ne '') {
881: $r->print('<input type="hidden" name="destsymb" value="'.
882: $env{'form.destsymb'}.'" />');
883: }
884: }
885: my $doheaders = &roletable_headers($r,\%roleclass,\%sortrole,$nochoose);
886: if ($env{'environment.recentroles'}) {
887: my %recent_roles =
888: &Apache::lonhtmlcommon::get_recent('roles',$env{'environment.recentrolesn'});
889: my $output='';
890: foreach (sort(keys(%recent_roles))) {
891: if (ref($roletext{'user.role.'.$_}) eq 'ARRAY') {
892: $output.= &Apache::loncommon::start_data_table_row().
893: $roletext{'user.role.'.$_}->[0].
894: &Apache::loncommon::end_data_table_row().
895: &Apache::loncommon::continue_data_table_row().
896: $roletext{'user.role.'.$_}->[1].
897: &Apache::loncommon::end_data_table_row();
898: if ($_ =~ m-dc\./($match_domain)/-
899: && $dcroles{$1}) {
900: $output .= &adhoc_roles_row($1,'recent');
901: }
902: } elsif ($numdc > 0) {
903: unless ($_ =~/^error\:/) {
904: $output.=&display_cc_role('user.role.'.$_);
905: }
906: }
907: }
908: if ($output) {
909: $r->print(&Apache::loncommon::start_data_table_empty_row()
910: .'<td align="center" colspan="5">'
911: .$recent
912: .'</td>'
913: .&Apache::loncommon::end_data_table_empty_row()
914: );
915: $r->print($output);
916: $doheaders ++;
917: }
918: }
919:
920: if ($numdc > 0) {
921: $r->print(&coursepick_jscript());
922: $r->print(&Apache::loncommon::coursebrowser_javascript().
923: &Apache::loncommon::authorbrowser_javascript());
924: }
925: &print_rolerows($r,$doheaders,\%roleclass,\%sortrole,\%dcroles,\%roletext);
926: if ($countactive > 1) {
927: my $tremark='';
928: my $tbg;
929: if ($env{'request.role'} eq 'cm') {
930: $tbg="LC_roles_selected";
931: $tremark=&mt('Currently selected.').' ';
932: } else {
933: $tbg="LC_roles_is";
934: }
935: $r->print(&Apache::loncommon::start_data_table_row());
936: unless ($nochoose) {
937: if ($env{'request.role'} ne 'cm') {
938: $r->print('<td class="'.$tbg.'"><input type="submit" value="'.
939: &mt('Select').'" name="cm" /></td>');
940: } else {
941: $r->print('<td class="'.$tbg.'"> </td>');
942: }
943: }
944: $r->print('<td colspan="3">'
945: .&mt('No role specified')
946: .'</td>'
947: .'<td>'.$tremark.' </td>'
948: .&Apache::loncommon::end_data_table_row()
949: );
950: }
951: $r->print(&Apache::loncommon::end_data_table());
952: unless ($nochoose) {
953: $r->print("</form>\n");
954: }
955: # ------------------------------------------------------------ Privileges Info
956: if (($advanced) && (($env{'user.error.msg'}) || ($error))) {
957: $r->print('<hr /><h2>'.&mt('Current Privileges').'</h2>');
958: $r->print(&privileges_info());
959: }
960: $r->print(&Apache::lonnet::getannounce());
961: if ($advanced) {
962: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
963: $r->print('<p><small><i>'
964: .&mt('This LON-CAPA server is version [_1]',$r->dir_config('lonVersion'))
965: .'</i><br />'
966: .'<a href="/adm/logout">'.&mt('Logout').'</a> '
967: .'<a href="/adm/coursecatalog?showdom='.$esc_dom.'">'
968: .&mt('Course/Community Catalog')
969: .'</a></small></p>');
970: }
971: $r->print(&Apache::loncommon::end_page());
972: return OK;
973: }
974:
975: sub gci_info_page {
976: return <<"END";
977: <br clear="all">
978: <div>
979: <h2>Welcome to the Geoscience Concept Inventory WebCenter</h2>
980: <p>
981: Use the tabs to navigate the WebCenter and...
982: <ul>
983: <li>Review and comment on existing GCI questions</li>
984: <li>Submit GCI questions of your own</li>
985: <li>Create an online test for your students</li>
986: <li>View tutorials on creating online tests</li>
987: </ul>
988: </p>
989: <p>For more information about writing and reviewing Concept Inventory questions
990: please refer to the <a href="/res/gci/gci/internal/pdfs/GCIWorkbook.pdf">GCI Workbook</a>.
991: </div>
992: END
993: }
994:
995: sub gather_roles {
996: my ($then,$refresh,$now,$reinit,$nochoose,$roletext,$sortrole,$roleclass,$futureroles,$timezones) = @_;
997: my ($countactive,$countfuture,$inrole,$possiblerole) = (0,0,0,'');
998: my $advanced = $env{'user.adv'};
999: my $tryagain = $env{'form.tryagain'};
1000: foreach my $envkey (sort(keys(%env))) {
1001: my $button = 1;
1002: my $switchserver='';
1003: my ($role_text,$role_text_end,$sortkey);
1004: if ($envkey=~/^user\.role\./) {
1005: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus,$tpstart,$tpend);
1006: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
1007: \$trolecode,\$tstatus,\$tstart,\$tend);
1008: next if (!defined($role) || $role eq '' || $role =~ /^gr/);
1009: my $timezone = &role_timezone($where,$timezones);
1010: $tremark='';
1011: $tpstart=' ';
1012: $tpend=' ';
1013: if ($tstart) {
1014: $tpstart=&Apache::lonlocal::locallocaltime($tstart,$timezone);
1015: }
1016: if ($tend) {
1017: $tpend=&Apache::lonlocal::locallocaltime($tend,$timezone);
1018: }
1019: if ($env{'request.role'} eq $trolecode) {
1020: $tstatus='selected';
1021: }
1022: my $tbg;
1023: if (($tstatus eq 'is')
1024: || ($tstatus eq 'selected')
1025: || ($tstatus eq 'future')
1026: || ($env{'form.showall'})) {
1027: if ($tstatus eq 'is') {
1028: $tbg='LC_roles_is';
1029: $possiblerole=$trolecode;
1030: $countactive++;
1031: } elsif ($tstatus eq 'future') {
1032: $tbg='LC_roles_future';
1033: $button=0;
1034: $futureroles->{$trolecode} = $tstart.':'.$tend;
1035: $countfuture ++;
1036: } elsif ($tstatus eq 'expired') {
1037: $tbg='LC_roles_expired';
1038: $button=0;
1039: } elsif ($tstatus eq 'will_not') {
1040: $tbg='LC_roles_will_not';
1041: $tremark.=&mt('Expired after logout.').' ';
1042: } elsif ($tstatus eq 'selected') {
1043: $tbg='LC_roles_selected';
1044: $inrole=1;
1045: $countactive++;
1046: $tremark.=&mt('Currently selected.').' ';
1047: }
1048: my $trole;
1049: if ($role =~ /^cr\//) {
1050: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$role);
1051: if ($tremark) { $tremark.='<br />'; }
1052: $tremark.=&mt('Defined by [_1] at [_2].',$rauthor,$rdomain);
1053: }
1054: $trole=Apache::lonnet::plaintext($role);
1055: my $ttype;
1056: my $twhere;
1057: my ($tdom,$trest,$tsection)=
1058: split(/\//,Apache::lonnet::declutter($where));
1059: # First, Co-Authorship roles
1060: if (($role eq 'ca') || ($role eq 'aa')) {
1061: my $home = &Apache::lonnet::homeserver($trest,$tdom);
1062: my $allowed=0;
1063: my @ids=&Apache::lonnet::current_machine_ids();
1064: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
1065: if (!$allowed) {
1066: $button=0;
1067: $switchserver='otherserver='.$home.'&role='.$trolecode;
1068: }
1069: #next if ($home eq 'no_host');
1070: $home = &Apache::lonnet::hostname($home);
1071: $ttype='Construction Space';
1072: $twhere=&mt('User').': '.$trest.'<br />'.&mt('Domain').
1073: ': '.$tdom.'<br />'.
1074: ' '.&mt('Server').': '.$home;
1075: $env{'course.'.$tdom.'_'.$trest.'.description'}='ca';
1076: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$trest.'/');
1077: $sortkey=$role."$trest:$tdom";
1078: } elsif ($role eq 'au') {
1079: # Authors
1080: my $home = &Apache::lonnet::homeserver
1081: ($env{'user.name'},$env{'user.domain'});
1082: my $allowed=0;
1083: my @ids=&Apache::lonnet::current_machine_ids();
1084: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
1085: if (!$allowed) {
1086: $button=0;
1087: $switchserver='otherserver='.$home.'&role='.$trolecode;
1088: }
1089: #next if ($home eq 'no_host');
1090: $home = &Apache::lonnet::hostname($home);
1091: $ttype='Construction Space';
1092: $twhere=&mt('Domain').': '.$tdom.'<br />'.&mt('Server').
1093: ': '.$home;
1094: $env{'course.'.$tdom.'_'.$trest.'.description'}='ca';
1095: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$env{'user.name'}.'/');
1096: $sortkey=$role;
1097: } elsif ($trest) {
1098: my $tcourseid=$tdom.'_'.$trest;
1099: $ttype = &Apache::loncommon::course_type($tcourseid);
1100: $trole = &Apache::lonnet::plaintext($role,$ttype,$tcourseid);
1101: if ($env{'course.'.$tcourseid.'.description'}) {
1102: $twhere=$env{'course.'.$tcourseid.'.description'};
1103: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
1104: unless ($twhere eq &mt('Currently not available')) {
1105: $twhere.=' <span class="LC_fontsize_small">'.
1106: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
1107: '</span>';
1108: }
1109: } else {
1110: my %newhash=&Apache::lonnet::coursedescription($tcourseid);
1111: if (%newhash) {
1112: $sortkey=$role."\0".$tdom."\0".$newhash{'description'}.
1113: "\0".$envkey;
1114: $twhere=$newhash{'description'}.
1115: ' <span class="LC_fontsize_small">'.
1116: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
1117: '</span>';
1118: $ttype = $newhash{'type'};
1119: $trole = &Apache::lonnet::plaintext($role,$ttype,$tcourseid);
1120: } else {
1121: $twhere=&mt('Currently not available');
1122: $env{'course.'.$tcourseid.'.description'}=$twhere;
1123: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
1124: $ttype = 'Unavailable';
1125: }
1126: }
1127: if ($tsection) {
1128: $twhere.='<br />'.&mt('Section').': '.$tsection;
1129: }
1130: if ($role ne 'st') { $twhere.="<br />".&mt('Domain').":".$tdom; }
1131: } elsif ($tdom) {
1132: $ttype='Domain';
1133: $twhere=$tdom;
1134: $sortkey=$role.$twhere;
1135: } else {
1136: $ttype='System';
1137: $twhere=&mt('system wide');
1138: $sortkey=$role.$twhere;
1139: }
1140: ($role_text,$role_text_end) =
1141: &build_roletext($trolecode,$tdom,$trest,$tstatus,$tryagain,
1142: $advanced,$tremark,$tbg,$trole,$twhere,$tpstart,
1143: $tpend,$nochoose,$button,$switchserver,$reinit);
1144: $roletext->{$envkey}=[$role_text,$role_text_end];
1145: if (!$sortkey) {$sortkey=$twhere."\0".$envkey;}
1146: $sortrole->{$sortkey}=$envkey;
1147: $roleclass->{$envkey}=$ttype;
1148: }
1149: }
1150: }
1151: return ($countactive,$countfuture,$inrole,$possiblerole);
1152: }
1153:
1154: sub role_timezone {
1155: my ($where,$timezones) = @_;
1156: my $timezone;
1157: if (ref($timezones) eq 'HASH') {
1158: if ($where =~ m{^/($match_domain)/($match_courseid)}) {
1159: my $cdom = $1;
1160: my $cnum = $2;
1161: if ($cdom && $cnum) {
1162: if (!exists($timezones->{$cdom.'_'.$cnum})) {
1163: my %timehash =
1164: &Apache::lonnet::get('environment',['timezone'],$cdom,$cnum);
1165: if ($timehash{'timezone'} eq '') {
1166: if (!exists($timezones->{$cdom})) {
1167: my %domdefaults =
1168: &Apache::lonnet::get_domain_defaults($cdom);
1169: if ($domdefaults{'timezone_def'} eq '') {
1170: $timezones->{$cdom} = 'local';
1171: } else {
1172: $timezones->{$cdom} = $domdefaults{'timezone_def'};
1173: }
1174: }
1175: $timezones->{$cdom.'_'.$cnum} = $timezones->{$cdom};
1176: } else {
1177: $timezones->{$cdom.'_'.$cnum} =
1178: &Apache::lonlocal::gettimezone($timehash{'timezone'});
1179: }
1180: }
1181: $timezone = $timezones->{$cdom.'_'.$cnum};
1182: }
1183: } else {
1184: my ($tdom) = ($where =~ m{^/($match_domain)});
1185: if ($tdom) {
1186: if (!exists($timezones->{$tdom})) {
1187: my %domdefaults = &Apache::lonnet::get_domain_defaults($tdom);
1188: if ($domdefaults{'timezone_def'} eq '') {
1189: $timezones->{$tdom} = 'local';
1190: } else {
1191: $timezones->{$tdom} = $domdefaults{'timezone_def'};
1192: }
1193: }
1194: $timezone = $timezones->{$tdom};
1195: }
1196: }
1197: if ($timezone eq 'local') {
1198: $timezone = undef;
1199: }
1200: }
1201: return $timezone;
1202: }
1203:
1204: sub roletable_headers {
1205: my ($r,$roleclass,$sortrole,$nochoose) = @_;
1206: my $doheaders;
1207: if ((ref($sortrole) eq 'HASH') && (ref($roleclass) eq 'HASH')) {
1208: $r->print('<br />'
1209: .&Apache::loncommon::start_data_table()
1210: .&Apache::loncommon::start_data_table_header_row()
1211: );
1212: if (!$nochoose) { $r->print('<th> </th>'); }
1213: $r->print('<th>'.&mt('User Role').'</th>'
1214: .'<th>'.&mt('Extent').'</th>'
1215: .'<th>'.&mt('Start').'</th>'
1216: .'<th>'.&mt('End').'</th>'
1217: .&Apache::loncommon::end_data_table_header_row()
1218: );
1219: $doheaders=-1;
1220: my @roletypes = &roletypes();
1221: foreach my $type (@roletypes) {
1222: my $haverole=0;
1223: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%{$sortrole}))) {
1224: if ($roleclass->{$sortrole->{$which}} =~ /^\Q$type\E/) {
1225: $haverole=1;
1226: }
1227: }
1228: if ($haverole) { $doheaders++; }
1229: }
1230: }
1231: return $doheaders;
1232: }
1233:
1234: sub roletypes {
1235: my @types = ('Domain','Construction Space','Course','Community','Unavailable','System');
1236: return @types;
1237: }
1238:
1239: sub print_rolerows {
1240: my ($r,$doheaders,$roleclass,$sortrole,$dcroles,$roletext) = @_;
1241: if ((ref($roleclass) eq 'HASH') && (ref($sortrole) eq 'HASH')) {
1242: my @types = &roletypes();
1243: foreach my $type (@types) {
1244: my $output;
1245: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%{$sortrole}))) {
1246: if ($roleclass->{$sortrole->{$which}} =~ /^\Q$type\E/) {
1247: if (ref($roletext) eq 'HASH') {
1248: if (ref($roletext->{$sortrole->{$which}}) eq 'ARRAY') {
1249: $output.= &Apache::loncommon::start_data_table_row().
1250: $roletext->{$sortrole->{$which}}->[0].
1251: &Apache::loncommon::end_data_table_row().
1252: &Apache::loncommon::continue_data_table_row().
1253: $roletext->{$sortrole->{$which}}->[1].
1254: &Apache::loncommon::end_data_table_row();
1255: }
1256: if ($sortrole->{$which} =~ m-dc\./($match_domain)/-) {
1257: if (ref($dcroles) eq 'HASH') {
1258: if ($dcroles->{$1}) {
1259: $output .= &adhoc_roles_row($1,'');
1260: }
1261: }
1262: }
1263: }
1264: }
1265: }
1266: if ($output) {
1267: if ($doheaders > 0) {
1268: $r->print(&Apache::loncommon::start_data_table_empty_row()
1269: .'<td align="center" colspan="5">'
1270: .&mt($type)
1271: .'</td>'
1272: .&Apache::loncommon::end_data_table_empty_row()
1273: );
1274: }
1275: $r->print($output);
1276: }
1277: }
1278: }
1279: }
1280:
1281: sub findcourse_advice {
1282: my ($r) = @_;
1283: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
1284: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
1285: if (&Apache::lonnet::auto_run(undef,$env{'user.domain'})) {
1286: $r->print(&mt('If you were expecting to see an active role listed for a particular course in the [_1] domain, it may be missing for one of the following reasons:',$domdesc).'
1287: <ul>
1288: <li>'.&mt('The course has yet to be created.').'</li>
1289: <li>'.&mt('Automatic enrollment of registered students has not been enabled for the course.').'</li>
1290: <li>'.&mt('You are in a section of course for which automatic enrollment in the corresponding LON-CAPA course is not active.').'</li>
1291: <li>'.&mt('The start date for automated enrollment has yet to be reached.').'</li>
1292: <li>'.&mt('You registered for the course recently and there is a time lag between the time you register, and the time this information becomes available for the update of LON-CAPA course rosters.').'</li>
1293: </ul>');
1294: } else {
1295: $r->print(&mt('If you were expecting to see an active role listed for a particular course, that course may not have been created yet.').'<br />');
1296: }
1297: my $queued = &Apache::loncoursequeueadmin::queued_selfenrollment();
1298: if ($queued) {
1299: $r->print($queued);
1300: } else {
1301: $r->print(&mt('You have no request for contributor access pending approval by the GCI WebCenter team.').'<ul>'.
1302: '<li>'.&mt('This may mean that action was taken on your request in the time since your most recent log-in.[_1]View [_2]Message[_3] to see if this is the case.','<br />','<a href="/adm/communicate">','</a>').'</li>'.
1303: '<li>'.&mt('If you logout and log-in again you may find you now have access to the Geoscience Concept Inventory, as a contributor.').'</li>'.
1304: '</ul>');
1305: }
1306: return;
1307: }
1308:
1309: sub requestcourse_advice {
1310: my ($r) = @_;
1311: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
1312: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
1313: my (%can_request,%request_doms);
1314: &Apache::lonnet::check_can_request($env{'user.domain'},\%can_request,\%request_doms);
1315: if (keys(%request_doms) > 0) {
1316: my ($types,$typename) = &Apache::loncommon::course_types();
1317: if ((ref($types) eq 'ARRAY') && (ref($typename) eq 'HASH')) {
1318: $r->print('<h3>'.&mt('Request creation of a course or community').'</h3>'.
1319: '<p>'.&mt('You have rights to request the creation of courses and/or communities in the following domain(s):').'<ul>');
1320: my (@reqdoms,@reqtypes);
1321: foreach my $type (sort(keys(%request_doms))) {
1322: push(@reqtypes,$type);
1323: if (ref($request_doms{$type}) eq 'ARRAY') {
1324: my $domstr = join(', ',map { &Apache::lonnet::domain($_) } sort(@{$request_doms{$type}}));
1325: $r->print(
1326: '<li>'
1327: .&mt('[_1]'.$typename->{$type}.'[_2] in domain: [_3]',
1328: '<i>',
1329: '</i>',
1330: '<b>'.$domstr.'</b>')
1331: .'</li>'
1332: );
1333: foreach my $dom (@{$request_doms{$type}}) {
1334: unless (grep(/^\Q$dom\E/,@reqdoms)) {
1335: push(@reqdoms,$dom);
1336: }
1337: }
1338: }
1339: }
1340: my @showtypes;
1341: foreach my $type (@{$types}) {
1342: if (grep(/^\Q$type\E$/,@reqtypes)) {
1343: push(@showtypes,$type);
1344: }
1345: }
1346: my $requrl = '/adm/requestcourse';
1347: if (@reqdoms == 1) {
1348: $requrl .= '?showdom='.$reqdoms[0];
1349: }
1350: if (@showtypes > 0) {
1351: $requrl.=(($requrl=~/\?/)?'&':'?').'crstype='.$showtypes[0];
1352: }
1353: if (@reqdoms == 1 || @showtypes > 0) {
1354: $requrl .= '&state=crstype&action=new';
1355: }
1356: $r->print('</ul>'.&mt('Use the [_1]request form[_2] to submit a request for creation of a new course or community.','<a href="'.$requrl.'">','</a>').'</p>');
1357: }
1358: }
1359: return;
1360: }
1361:
1362: sub privileges_info {
1363: my ($which) = @_;
1364: my $output;
1365:
1366: $which ||= $env{'request.role'};
1367:
1368: foreach my $envkey (sort(keys(%env))) {
1369: next if ($envkey!~/^user\.priv\.\Q$which\E\.(.*)/);
1370:
1371: my $where=$1;
1372: my $ttype;
1373: my $twhere;
1374: my (undef,$tdom,$trest,$tsec)=split(m{/},$where);
1375: if ($trest) {
1376: if ($env{'course.'.$tdom.'_'.$trest.'.description'} eq 'ca') {
1377: $ttype='Construction Space';
1378: $twhere='User: '.$trest.', Domain: '.$tdom;
1379: } else {
1380: $ttype= &Apache::loncommon::course_type($tdom.'_'.$trest);
1381: $twhere=$env{'course.'.$tdom.'_'.$trest.'.description'};
1382: if ($tsec) {
1383: my $sec_type = 'Section';
1384: if (exists($env{"user.role.gr.$where"})) {
1385: $sec_type = 'Group';
1386: }
1387: $twhere.=' ('.$sec_type.': '.$tsec.')';
1388: }
1389: }
1390: } elsif ($tdom) {
1391: $ttype='Domain';
1392: $twhere=$tdom;
1393: } else {
1394: $ttype='System';
1395: $twhere='/';
1396: }
1397: $output .= "\n<h3>".&mt($ttype).': '.$twhere.'</h3>'."\n<ul>";
1398: foreach my $priv (sort(split(/:/,$env{$envkey}))) {
1399: next if (!$priv);
1400:
1401: my ($prv,$restr)=split(/\&/,$priv);
1402: my $trestr='';
1403: if ($restr ne 'F') {
1404: $trestr.=' ('.
1405: join(', ',
1406: map { &Apache::lonnet::plaintext($_) }
1407: (split('',$restr))).') ';
1408: }
1409: $output .= "\n\t".
1410: '<li>'.&Apache::lonnet::plaintext($prv).$trestr.'</li>';
1411: }
1412: $output .= "\n".'</ul>';
1413: }
1414: return $output;
1415: }
1416:
1417: sub build_roletext {
1418: my ($trolecode,$tdom,$trest,$tstatus,$tryagain,$advanced,$tremark,$tbg,$trole,$twhere,$tpstart,$tpend,$nochoose,$button,$switchserver,$reinit) = @_;
1419: my ($roletext,$roletext_end);
1420: my $is_dc=($trolecode =~ m/^dc\./);
1421: my $rowspan=($is_dc) ? ''
1422: : ' rowspan="2" ';
1423:
1424: unless ($nochoose) {
1425: my $buttonname=$trolecode;
1426: $buttonname=~s/\W//g;
1427: if (!$button) {
1428: if ($switchserver) {
1429: $roletext.='<td'.$rowspan.' class="'.$tbg.'">'
1430: .'<a href="/adm/switchserver?'.$switchserver.'">'
1431: .&mt('Switch Server')
1432: .'</a></td>';
1433: } else {
1434: $roletext.=('<td'.$rowspan.' class="'.$tbg.'"> </td>');
1435: }
1436: } elsif ($tstatus eq 'is') {
1437: $roletext.='<td'.$rowspan.' class="'.$tbg.'">'.
1438: '<input name="'.$buttonname.'" type="button" value="'.
1439: &mt('Select').'" onclick="javascript:enterrole(this.form,\''.
1440: $trolecode."','".$buttonname.'\');" /></td>';
1441: } elsif ($tryagain) {
1442: $roletext.=
1443: '<td'.$rowspan.' class="'.$tbg.'">'.
1444: '<input name="'.$buttonname.'" type="button" value="'.
1445: &mt('Try Selecting Again').'" onclick="javascript:enterrole(this.form,\''.
1446: $trolecode."','".$buttonname.'\');" /></td>';
1447: } elsif ($advanced) {
1448: $roletext.=
1449: '<td'.$rowspan.' class="'.$tbg.'">'.
1450: '<input name="'.$buttonname.'" type="button" value="'.
1451: &mt('Re-Initialize').'" onclick="javascript:enterrole(this.form,\''.
1452: $trolecode."','".$buttonname.'\');" /></td>';
1453: } elsif ($reinit) {
1454: $roletext.=
1455: '<td'.$rowspan.' class="'.$tbg.'">'.
1456: '<input name="'.$buttonname.'" type="button" value="'.
1457: &mt('Re-Select').'" onclick="javascript:enterrole(this.form,\''.
1458: $trolecode."','".$buttonname.'\');" /></td>';
1459: } else {
1460: $roletext.=
1461: '<td'.$rowspan.' class="'.$tbg.'">'.
1462: '<input name="'.$buttonname.'" type="button" value="'.
1463: &mt('Re-Select').'" onclick="javascript:enterrole(this.form,\''.
1464: $trolecode."','".$buttonname.'\');" /></td>';
1465: }
1466: }
1467: if ($trolecode !~ m/^(dc|ca|au|aa)\./) {
1468: $tremark.=&Apache::lonannounce::showday(time,1,
1469: &Apache::lonannounce::readcalendar($tdom.'_'.$trest));
1470: }
1471: $roletext.='<td>'.$trole.'</td>'
1472: .'<td>'.$twhere.'</td>'
1473: .'<td>'.$tpstart.'</td>'
1474: .'<td>'.$tpend.'</td>';
1475: if (!$is_dc) {
1476: $roletext_end = '<td colspan="4">'.
1477: $tremark.' '.
1478: '</td>';
1479: }
1480: return ($roletext,$roletext_end);
1481: }
1482:
1483: sub check_needs_switchserver {
1484: my ($possiblerole) = @_;
1485: my $needs_switchserver;
1486: my ($role,$where) = split(/\./,$possiblerole,2);
1487: my (undef,$tdom,$twho) = split(/\//,$where);
1488: my ($server_status,$home);
1489: if (($role eq 'ca') || ($role eq 'aa')) {
1490: ($server_status,$home) = &check_author_homeserver($twho,$tdom);
1491: } else {
1492: ($server_status,$home) = &check_author_homeserver($env{'user.name'},
1493: $env{'user.domain'});
1494: }
1495: if ($server_status eq 'switchserver') {
1496: $needs_switchserver = 1;
1497: }
1498: return $needs_switchserver;
1499: }
1500:
1501: sub check_author_homeserver {
1502: my ($uname,$udom)=@_;
1503: if (($uname eq '') || ($udom eq '')) {
1504: return ('fail','');
1505: }
1506: my $home = &Apache::lonnet::homeserver($uname,$udom);
1507: if (&Apache::lonnet::host_domain($home) ne $udom) {
1508: return ('fail',$home);
1509: }
1510: my @ids=&Apache::lonnet::current_machine_ids();
1511: if (grep(/^\Q$home\E$/,@ids)) {
1512: return ('ok',$home);
1513: } else {
1514: return ('switchserver',$home);
1515: }
1516: }
1517:
1518: sub check_fordc {
1519: my ($dcroles,$then) = @_;
1520: my $numdc = 0;
1521: if ($env{'user.adv'}) {
1522: foreach my $envkey (sort keys %env) {
1523: if ($envkey=~/^user\.role\.dc\.\/($match_domain)\/$/) {
1524: my $dcdom = $1;
1525: my $livedc = 1;
1526: my ($tstart,$tend)=split(/\./,$env{$envkey});
1527: if ($tstart && $tstart>$then) { $livedc = 0; }
1528: if ($tend && $tend <$then) { $livedc = 0; }
1529: if ($livedc) {
1530: $$dcroles{$dcdom} = $envkey;
1531: $numdc++;
1532: }
1533: }
1534: }
1535: }
1536: return $numdc;
1537: }
1538:
1539: sub adhoc_course_role {
1540: my ($refresh,$then) = @_;
1541: my ($cdom,$cnum,$crstype);
1542: $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1543: $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
1544: $crstype = &Apache::loncommon::course_type();
1545: if (&check_forcc($cdom,$cnum,$refresh,$then,$crstype)) {
1546: my $setprivs;
1547: if (!defined($env{'user.role.'.$env{'form.switchrole'}})) {
1548: $setprivs = 1;
1549: } else {
1550: my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.switchrole'}});
1551: if (($start && ($start>$refresh || $start == -1)) ||
1552: ($end && $end<$then)) {
1553: $setprivs = 1;
1554: }
1555: }
1556: if ($setprivs) {
1557: if ($env{'form.switchrole'} =~ m-^(in|ta|ep|ad|st|cr)([\w/]*)\./\Q$cdom\E/\Q$cnum\E/?(\w*)$-) {
1558: my $role = $1;
1559: my $custom_role = $2;
1560: my $usec = $3;
1561: if ($role eq 'cr') {
1562: if ($custom_role =~ m-^/$match_domain/$match_username/\w+$-) {
1563: $role .= $custom_role;
1564: } else {
1565: return;
1566: }
1567: }
1568: my (%userroles,%newrole,%newgroups,%group_privs);
1569: my %cgroups =
1570: &Apache::lonnet::get_active_groups($env{'user.domain'},
1571: $env{'user.name'},$cdom,$cnum);
1572: foreach my $group (keys(%cgroups)) {
1573: $group_privs{$group} =
1574: $env{'user.priv.cc./'.$cdom.'/'.$cnum.'./'.$cdom.'/'.$cnum.'/'.$group};
1575: }
1576: $newgroups{'/'.$cdom.'/'.$cnum} = \%group_privs;
1577: my $area = '/'.$cdom.'/'.$cnum;
1578: my $spec = $role.'.'.$area;
1579: if ($usec ne '') {
1580: $spec .= '/'.$usec;
1581: $area .= '/'.$usec;
1582: }
1583: &Apache::lonnet::standard_roleprivs(\%newrole,$role,$cdom,$spec,$cnum,$area);
1584: &Apache::lonnet::set_userprivs(\%userroles,\%newrole,\%newgroups);
1585: my $adhocstart = $refresh-1;
1586: $userroles{'user.role.'.$spec} = $adhocstart.'.';
1587: &Apache::lonnet::appenv(\%userroles,[$role,'cm']);
1588: }
1589: }
1590: }
1591: return;
1592: }
1593:
1594: sub check_forcc {
1595: my ($cdom,$cnum,$refresh,$then,$crstype) = @_;
1596: my ($is_cc,$ccrole);
1597: if ($crstype eq 'Community') {
1598: $ccrole = 'co';
1599: } else {
1600: $ccrole = 'cc';
1601: }
1602: if ($cdom ne '' && $cnum ne '') {
1603: if (&Apache::lonnet::is_course($cdom,$cnum)) {
1604: my $envkey = 'user.role.'.$ccrole.'./'.$cdom.'/'.$cnum;
1605: if (defined($env{$envkey})) {
1606: $is_cc = 1;
1607: my ($tstart,$tend)=split(/\./,$env{$envkey});
1608: if ($tstart && $tstart>$refresh) { $is_cc = 0; }
1609: if ($tend && $tend <$then) { $is_cc = 0; }
1610: }
1611: }
1612: }
1613: return $is_cc;
1614: }
1615:
1616: sub courselink {
1617: my ($dcdom,$rowtype) = @_;
1618: my $courseform=&Apache::loncommon::selectcourse_link
1619: ('rolechoice','dccourse'.$rowtype.'_'.$dcdom,
1620: 'dcdomain'.$rowtype.'_'.$dcdom,'coursedesc'.$rowtype.'_'.
1621: $dcdom,$dcdom,undef,'Course/Community');
1622: my $hiddenitems = '<input type="hidden" name="dcdomain'.$rowtype.'_'.$dcdom.'" value="'.$dcdom.'" />'.
1623: '<input type="hidden" name="origdom'.$rowtype.'_'.$dcdom.'" value="'.$dcdom.'" />'.
1624: '<input type="hidden" name="dccourse'.$rowtype.'_'.$dcdom.'" value="" />'.
1625: '<input type="hidden" name="coursedesc'.$rowtype.'_'.$dcdom.'" value="" />';
1626: return $courseform.$hiddenitems;
1627: }
1628:
1629: sub coursepick_jscript {
1630: my %lt = &Apache::lonlocal::texthash(
1631: plsu => "Please use the 'Select Course/Community' link to open a separate pick course window where you may select the course or community you wish to enter.",
1632: youc => 'You can only use this screen to select courses and communities in the current domain.',
1633: );
1634: my $verify_script = <<"END";
1635: <script type="text/javascript">
1636: // <![CDATA[
1637: function verifyCoursePick(caller) {
1638: var numbutton = getIndex(caller)
1639: var pickedCourse = document.rolechoice.elements[numbutton+4].value
1640: var pickedDomain = document.rolechoice.elements[numbutton+2].value
1641: if (document.rolechoice.elements[numbutton+2].value == document.rolechoice.elements[numbutton+3].value) {
1642: if (pickedCourse != '') {
1643: if (numbutton != -1) {
1644: var courseTarget = "cc./"+pickedDomain+"/"+pickedCourse
1645: document.rolechoice.elements[numbutton+1].name = courseTarget
1646: document.rolechoice.submit()
1647: }
1648: }
1649: else {
1650: alert("$lt{'plsu'}");
1651: }
1652: }
1653: else {
1654: alert("$lt{'youc'}")
1655: }
1656: }
1657: function getIndex(caller) {
1658: for (var i=0;i<document.rolechoice.elements.length;i++) {
1659: if (document.rolechoice.elements[i] == caller) {
1660: return i;
1661: }
1662: }
1663: return -1;
1664: }
1665: // ]]>
1666: </script>
1667: END
1668: return $verify_script;
1669: }
1670:
1671: sub coauthorlink {
1672: my ($dcdom,$rowtype) = @_;
1673: my $coauthorform=&Apache::loncommon::selectauthor_link('rolechoice',$dcdom);
1674: my $hiddenitems = '<input type="hidden" name="adhoccauname'.$rowtype.'_'.$dcdom.'" value="" />';
1675: return $coauthorform.$hiddenitems;
1676: }
1677:
1678: sub display_cc_role {
1679: my $rolekey = shift;
1680: my ($roletext,$roletext_end);
1681: my $advanced = $env{'user.adv'};
1682: my $tryagain = $env{'form.tryagain'};
1683: unless ($rolekey =~/^error\:/) {
1684: if ($rolekey =~ m{^user\.role\.(cc|co)\./($match_domain)/($match_courseid)$}) {
1685: my $ccrole = $1;
1686: my $tcourseid = $2.'_'.$3;
1687: my $trolecode = $1.'./'.$2.'/'.$3;
1688: my $twhere;
1689: my $ttype;
1690: my $tbg='LC_roles_is';
1691: my %newhash=&Apache::lonnet::coursedescription($tcourseid);
1692: if (%newhash) {
1693: $twhere=$newhash{'description'}.
1694: ' <span style="LC_fontsize_small">'.
1695: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$2,$1).
1696: '</span>';
1697: $ttype = $newhash{'type'};
1698: } else {
1699: $twhere=&mt('Currently not available');
1700: $env{'course.'.$tcourseid.'.description'}=$twhere;
1701: }
1702: my $trole = &Apache::lonnet::plaintext($ccrole,$ttype,$tcourseid);
1703: $twhere.="<br />".&mt('Domain').":".$1;
1704: ($roletext,$roletext_end) = &build_roletext($trolecode,$1,$2,'is',$tryagain,$advanced,'',$tbg,$trole,$twhere,'','','',1,'');
1705: }
1706: }
1707: return ($roletext,$roletext_end);
1708: }
1709:
1710: sub adhoc_roles_row {
1711: my ($dcdom,$rowtype) = @_;
1712: my $output = &Apache::loncommon::continue_data_table_row()
1713: .' <td colspan="5">'
1714: .&mt('[_1]Ad hoc[_2] roles in domain [_3] --'
1715: ,'<span class="LC_cusr_emph">','</span>',$dcdom)
1716: .' ';
1717: my $selectcclink = &courselink($dcdom,$rowtype);
1718: my $ccrole = &Apache::lonnet::plaintext('co',undef,undef,1);
1719: my $carole = &Apache::lonnet::plaintext('ca');
1720: my $selectcalink = &coauthorlink($dcdom,$rowtype);
1721: $output.=$ccrole.': '.$selectcclink
1722: .' | '.$carole.': '.$selectcalink
1723: .&Apache::loncommon::end_data_table_row();
1724: return $output;
1725: }
1726:
1727: sub recent_filename {
1728: my $area=shift;
1729: return 'nohist_recent_'.&escape($area);
1730: }
1731:
1732: sub courseloadpage {
1733: my ($courseid) = @_;
1734: my $startpage;
1735: my %entry_settings = &Apache::lonnet::get('nohist_whatsnew',
1736: [$courseid.':courseinit']);
1737: my ($tmp) = %entry_settings;
1738: unless ($tmp =~ /^error: 2 /) {
1739: $startpage = $entry_settings{$courseid.':courseinit'};
1740: }
1741: if ($startpage eq '') {
1742: if (exists($env{'environment.course_init_display'})) {
1743: $startpage = $env{'environment.course_init_display'};
1744: }
1745: }
1746: return $startpage;
1747: }
1748:
1749: 1;
1750: __END__
1751:
1752: =head1 NAME
1753:
1754: Apache::lonroles - User Roles Screen
1755:
1756: =head1 SYNOPSIS
1757:
1758: Invoked by /etc/httpd/conf/srm.conf:
1759:
1760: <Location /adm/roles>
1761: PerlAccessHandler Apache::lonacc
1762: SetHandler perl-script
1763: PerlHandler Apache::lonroles
1764: ErrorDocument 403 /adm/login
1765: ErrorDocument 500 /adm/errorhandler
1766: </Location>
1767:
1768: =head1 OVERVIEW
1769:
1770: =head2 Choosing Roles
1771:
1772: C<lonroles> is a handler that allows a user to switch roles in
1773: mid-session. LON-CAPA attempts to work with "No Role Specified", the
1774: default role that a user has before selecting a role, as widely as
1775: possible, but certain handlers for example need specification which
1776: course they should act on, etc. Both in this scenario, and when the
1777: handler determines via C<lonnet>'s C<&allowed> function that a certain
1778: action is not allowed, C<lonroles> is used as error handler. This
1779: allows the user to select another role which may have permission to do
1780: what they were trying to do. C<lonroles> can also be accessed via the
1781: B<CRS> button in the Remote Control.
1782:
1783: =begin latex
1784:
1785: \begin{figure}
1786: \begin{center}
1787: \includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen}
1788: \caption{\label{Sample_Roles_Screen}Sample Roles Screen}
1789: \end{center}
1790: \end{figure}
1791:
1792: =end latex
1793:
1794: =head2 Role Initialization
1795:
1796: 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<lonnet>'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.
1797:
1798: =head1 INTRODUCTION
1799:
1800: This module enables a user to select what role he wishes to
1801: operate under (instructor, student, teaching assistant, course
1802: coordinator, etc). These roles are pre-established by the actions
1803: of upper-level users.
1804:
1805: This is part of the LearningOnline Network with CAPA project
1806: described at http://www.lon-capa.org.
1807:
1808: =head1 HANDLER SUBROUTINE
1809:
1810: This routine is called by Apache and mod_perl.
1811:
1812: =over 4
1813:
1814: =item *
1815:
1816: Roles Initialization (yes/no)
1817:
1818: =item *
1819:
1820: Get Error Message from Environment
1821:
1822: =item *
1823:
1824: Who is this?
1825:
1826: =item *
1827:
1828: Generate Page Output
1829:
1830: =item *
1831:
1832: Choice or no choice
1833:
1834: =item *
1835:
1836: Table
1837:
1838: =item *
1839:
1840: Privileges
1841:
1842: =back
1843:
1844: =cut
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