File:
[LON-CAPA] /
loncom /
auth /
lonroles.pm
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1.240.2.15:
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Mon Aug 9 23:39:59 2010 UTC (13 years, 9 months ago) by
raeburn
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GCI_3
- Customization for GCI_3. For Concept Tests:
- Keep track of last course "login"
- Keep track of submission count by students in Concep Tests.
- New What's New item - Last login for users (day, week, month, ever).
- Eliminate columns for groups and clickers for classlist display.
- Add new columns for last login and test status (completed, incomplete, unattempted).
1: # The LearningOnline Network with CAPA
2: # User Roles Screen
3: #
4: # $Id: lonroles.pm,v 1.240.2.15 2010/08/09 23:39:59 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::lonmainmenu();
142: use Apache::loncoursequeueadmin;
143: use GDBM_File;
144: use LONCAPA qw(:DEFAULT :match);
145: use HTML::Entities;
146:
147:
148: sub redirect_user {
149: my ($r,$title,$url,$msg,$launch_nav) = @_;
150: $msg = $title if (! defined($msg));
151: &Apache::loncommon::content_type($r,'text/html');
152: &Apache::loncommon::no_cache($r);
153: $r->send_http_header;
154: my $swinfo=&Apache::lonmenu::rawconfig();
155: my $navwindow;
156: if ($launch_nav eq 'on') {
157: $navwindow.=&Apache::lonnavdisplay::launch_win('now',undef,undef,
158: ($url =~ m-^/adm/whatsnew-));
159: } else {
160: $navwindow.=&Apache::lonnavmaps::close();
161: }
162:
163: # Breadcrumbs
164: my $brcrum = [{'href' => $url,
165: 'text' => 'Switching Role'},];
166: my $start_page = &Apache::loncommon::start_page('Switching Role',undef,
167: {'redirect' => [1,$url],
168: 'bread_crumbs' => $brcrum,});
169: &Apache::lonhtmlcommon::clear_breadcrumbs();
170: my $end_page = &Apache::loncommon::end_page();
171:
172: # Note to style police:
173: # This must only replace the spaces, nothing else, or it bombs elsewhere.
174: $url=~s/ /\%20/g;
175: $r->print(<<ENDREDIR);
176: $start_page
177: <script type="text/javascript">
178: // <![CDATA[
179: $swinfo
180: // ]]>
181: </script>
182: $navwindow
183: <p>$msg</p>
184: $end_page
185: ENDREDIR
186: return;
187: }
188:
189: sub error_page {
190: my ($r,$error,$dest)=@_;
191: &Apache::loncommon::content_type($r,'text/html');
192: &Apache::loncommon::no_cache($r);
193: $r->send_http_header;
194: return OK if $r->header_only;
195: # Breadcrumbs
196: my $brcrum = [{'href' => $dest,
197: 'text' => 'Problems during Course Initialization'},];
198: $r->print(&Apache::loncommon::start_page('Problems during Course Initialization',
199: undef,
200: {'bread_crumbs' => $brcrum,})
201: );
202: $r->print(
203: '<script type="text/javascript">'.
204: '// <![CDATA['.
205: &Apache::lonmenu::rawconfig().
206: '// ]]>'.
207: '</script>'.
208: '<p class="LC_error">'.&mt('The following problems occurred:').
209: '<br />'.
210: $error.
211: '</p><br /><a href="'.$dest.'">'.&mt('Continue').'</a>'
212: );
213: $r->print(&Apache::loncommon::end_page());
214: }
215:
216: sub handler {
217:
218: my $r = shift;
219:
220: my $now=time;
221: my $then=$env{'user.login.time'};
222: my $refresh=$env{'user.refresh.time'};
223: if (!$refresh) {
224: $refresh = $then;
225: }
226: my $envkey;
227: my %dcroles = ();
228: my $numdc = &check_fordc(\%dcroles,$then);
229: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
230: my $custommenu = &Apache::loncommon::needs_gci_custom();
231:
232: # ================================================================== Roles Init
233: if ($env{'form.selectrole'}) {
234:
235: my $locknum=&Apache::lonnet::get_locks();
236: if ($locknum) { return 409; }
237:
238: if ($env{'form.newrole'}) {
239: $env{'form.'.$env{'form.newrole'}}=1;
240: }
241: if ($env{'request.course.id'}) {
242: # Check if user is CC trying to select a course role
243: if ($env{'form.switchrole'}) {
244: if (!defined($env{'user.role.'.$env{'form.switchrole'}})) {
245: &adhoc_course_role($refresh,$then);
246: }
247: }
248: my %temp=('logout_'.$env{'request.course.id'} => time);
249: &Apache::lonnet::put('email_status',\%temp);
250: &Apache::lonnet::delenv('user.state.'.$env{'request.course.id'});
251: }
252: &Apache::lonnet::appenv({"request.course.id" => '',
253: "request.course.fn" => '',
254: "request.course.uri" => '',
255: "request.course.sec" => '',
256: "request.role" => 'cm',
257: "request.role.adv" => $env{'user.adv'},
258: "request.role.domain" => $env{'user.domain'}});
259: # Check if user is a DC trying to enter a course or author space and needs privs to be created
260: if ($numdc > 0) {
261: foreach my $envkey (keys %env) {
262: # Is this an ad-hoc Coordinator role?
263: if (my ($ccrole,$domain,$coursenum) =
264: ($envkey =~ m-^form\.(cc|co)\./($match_domain)/($match_courseid)$-)) {
265: if ($dcroles{$domain}) {
266: &Apache::lonnet::check_adhoc_privs($domain,$coursenum,
267: $then,$refresh,$now,$ccrole);
268: }
269: last;
270: }
271: # Is this an ad-hoc CA-role?
272: if (my ($domain,$user) =
273: ($envkey =~ m-^form\.ca\./($match_domain)/($match_username)$-)) {
274: if (($domain eq $env{'user.domain'}) && ($user eq $env{'user.name'})) {
275: delete($env{$envkey});
276: $env{'form.au./'.$domain.'/'} = 1;
277: my ($server_status,$home) = &check_author_homeserver($user,$domain);
278: if ($server_status eq 'switchserver') {
279: my $trolecode = 'au./'.$domain.'/';
280: my $switchserver = '/adm/switchserver?otherserver='.$home.'&role='.$trolecode;
281: $r->internal_redirect($switchserver);
282: }
283: last;
284: }
285: if (my ($castart,$caend) = ($env{'user.role.ca./'.$domain.'/'.$user} =~ /^(\d*)\.(\d*)$/)) {
286: if (((($castart) && ($castart < $now)) || !$castart) &&
287: ((!$caend) || (($caend) && ($caend > $now)))) {
288: my ($server_status,$home) = &check_author_homeserver($user,$domain);
289: if ($server_status eq 'switchserver') {
290: my $trolecode = 'ca./'.$domain.'/'.$user;
291: my $switchserver = '/adm/switchserver?otherserver='.$home.'&role='.$trolecode;
292: $r->internal_redirect($switchserver);
293: }
294: last;
295: }
296: }
297: # Check if author blocked ca-access
298: my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],$domain,$user);
299: if ($blocked{'domcoord.author'} eq 'blocked') {
300: delete($env{$envkey});
301: $env{'user.error.msg'}=':::1:User '.$user.' in domain '.$domain.' blocked domain coordinator access';
302: last;
303: }
304: if ($dcroles{$domain}) {
305: my ($server_status,$home) = &check_author_homeserver($user,$domain);
306: if (($server_status eq 'ok') || ($server_status eq 'switchserver')) {
307: &Apache::lonnet::check_adhoc_privs($domain,$user,$then,
308: $refresh,$now,'ca');
309: if ($server_status eq 'switchserver') {
310: my $trolecode = 'ca./'.$domain.'/'.$user;
311: my $switchserver = '/adm/switchserver?'
312: .'otherserver='.$home.'&role='.$trolecode;
313: $r->internal_redirect($switchserver);
314: }
315: } else {
316: delete($env{$envkey});
317: }
318: } else {
319: delete($env{$envkey});
320: }
321: last;
322: }
323: }
324: }
325: if (($env{'form.cm'}) && ($env{'form.orgurl'})) {
326: $r->internal_redirect($env{'form.orgurl'});
327: }
328: foreach $envkey (keys %env) {
329: next if ($envkey!~/^user\.role\./);
330: my ($where,$trolecode,$role,$tstatus,$tend,$tstart);
331: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
332: \$trolecode,\$tstatus,\$tstart,\$tend);
333: if ($env{'form.'.$trolecode}) {
334: if ($tstatus eq 'is') {
335: $where=~s/^\///;
336: my ($cdom,$cnum,$csec)=split(/\//,$where);
337: # check for course groups
338: my %coursegroups = &Apache::lonnet::get_active_groups(
339: $env{'user.domain'},$env{'user.name'},$cdom, $cnum);
340: my $cgrps = join(':',keys(%coursegroups));
341:
342: # store role if recent_role list being kept
343: if ($env{'environment.recentroles'}) {
344: my %frozen_roles =
345: &Apache::lonhtmlcommon::get_recent_frozen('roles',$env{'environment.recentrolesn'});
346: &Apache::lonhtmlcommon::store_recent('roles',
347: $trolecode,' ',$frozen_roles{$trolecode});
348: }
349:
350:
351: # check for keyed access
352: if (($role eq 'st') &&
353: ($env{'course.'.$cdom.'_'.$cnum.'.keyaccess'} eq 'yes')) {
354: # who is key authority?
355: my $authdom=$cdom;
356: my $authnum=$cnum;
357: if ($env{'course.'.$cdom.'_'.$cnum.'.keyauth'}) {
358: ($authnum,$authdom)=
359: split(/:/,$env{'course.'.$cdom.'_'.$cnum.'.keyauth'});
360: }
361: # check with key authority
362: unless (&Apache::lonnet::validate_access_key(
363: $env{'environment.key.'.$cdom.'_'.$cnum},
364: $authdom,$authnum)) {
365: # there is no valid key
366: if ($env{'form.newkey'}) {
367: # student attempts to register a new key
368: &Apache::loncommon::content_type($r,'text/html');
369: &Apache::loncommon::no_cache($r);
370: $r->send_http_header;
371: my $swinfo=&Apache::lonmenu::rawconfig();
372: my $start_page=&Apache::loncommon::start_page
373: ('Verifying Access Key to Unlock this Course');
374: my $end_page=&Apache::loncommon::end_page();
375: my $buttontext=&mt('Enter Course');
376: my $message=&mt('Successfully registered key');
377: my $assignresult=
378: &Apache::lonnet::assign_access_key(
379: $env{'form.newkey'},
380: $authdom,$authnum,
381: $cdom,$cnum,
382: $env{'user.domain'},
383: $env{'user.name'},
384: &mt('Assigned from [_1] at [_2] for [_3]'
385: ,$ENV{'REMOTE_ADDR'}
386: ,&Apache::lonlocal::locallocaltime()
387: ,$trolecode)
388: );
389: unless ($assignresult eq 'ok') {
390: $assignresult=~s/^error\:\s*//;
391: $message=&mt($assignresult).
392: '<br /><a href="/adm/logout">'.
393: &mt('Logout').'</a>';
394: $buttontext=&mt('Re-Enter Key');
395: }
396: $r->print(<<ENDENTEREDKEY);
397: $start_page
398: <script type="text/javascript">
399: // <![CDATA[
400: $swinfo
401: // ]]>
402: </script>
403: <form action="" method="post">
404: <input type="hidden" name="selectrole" value="1" />
405: <input type="hidden" name="$trolecode" value="1" />
406: <span class="LC_fontsize_large">$message</span><br />
407: <input type="submit" value="$buttontext" />
408: </form>
409: $end_page
410: ENDENTEREDKEY
411: return OK;
412: } else {
413: # print form to enter a new key
414: &Apache::loncommon::content_type($r,'text/html');
415: &Apache::loncommon::no_cache($r);
416: $r->send_http_header;
417: my $swinfo=&Apache::lonmenu::rawconfig();
418: my $start_page=&Apache::loncommon::start_page
419: ('Enter Access Key to Unlock this Course');
420: my $end_page=&Apache::loncommon::end_page();
421: $r->print(<<ENDENTERKEY);
422: $start_page
423: <script type="text/javascript">
424: // <![CDATA[
425: $swinfo
426: // ]]>
427: </script>
428: <form action="" method="post">
429: <input type="hidden" name="selectrole" value="1" />
430: <input type="hidden" name="$trolecode" value="1" />
431: <input type="text" size="20" name="newkey" value="$env{'form.newkey'}" />
432: <input type="submit" value="Enter key" />
433: </form>
434: $end_page
435: ENDENTERKEY
436: return OK;
437: }
438: }
439: }
440: &Apache::lonnet::log($env{'user.domain'},
441: $env{'user.name'},
442: $env{'user.home'},
443: "Role ".$trolecode);
444:
445: &Apache::lonnet::appenv(
446: {'request.role' => $trolecode,
447: 'request.role.domain' => $cdom,
448: 'request.course.sec' => $csec,
449: 'request.course.groups' => $cgrps});
450: my $tadv=0;
451:
452: if (($cnum) && ($role ne 'ca') && ($role ne 'aa')) {
453: my $msg;
454: if (&Apache::lonnet::allowed('adv') eq 'F') { $tadv=1; }
455: &Apache::lonnet::appenv({'request.role.adv'=>$tadv});
456: my ($furl,$ferr)=
457: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
458: if ($custommenu) {
459: unless (($ferr) || ($env{'form.switchrole'})) {
460: &Apache::lonnet::put('nohist_crslastlogin',{$env{'user.name'}.':'.$env{'user.domain'}.':'.$csec.':'.$role => $now},
461: $cdom,$cnum);
462: }
463: }
464: if (($env{'form.orgurl'}) &&
465: ($env{'form.orgurl'}!~/^\/adm\/flip/)) {
466: my $dest=$env{'form.orgurl'};
467: if ($env{'form.symb'}) {
468: if ($dest =~ /\?/) {
469: $dest .= '&';
470: } else {
471: $dest .= '?'
472: }
473: $dest .= 'symb='.$env{'form.symb'};
474: }
475: if (($ferr) && ($tadv)) {
476: &error_page($r,$ferr,$dest);
477: } else {
478: $r->internal_redirect($dest);
479: }
480: return OK;
481: } else {
482: if (!$env{'request.course.id'}) {
483: &Apache::lonnet::appenv(
484: {"request.course.id" => $cdom.'_'.$cnum});
485: $furl='/adm/roles?tryagain=1';
486: $msg='<p><span class="LC_error">'
487: .&mt('Could not initialize [_1] at this time.',
488: $env{'course.'.$cdom.'_'.$cnum.'.description'})
489: .'</span></p>'
490: .'<p>'.&mt('Please try again.').'</p>'
491: .'<p>'.$ferr.'</p>';
492: }
493:
494: if (($ferr) && ($tadv)) {
495: &error_page($r,$ferr,$furl);
496: } else {
497: # Check to see if the user is a CC entering a course
498: # for the first time
499: my (undef, undef, $role, $courseid) = split(/\./, $envkey);
500: if (substr($courseid, 0, 1) eq '/') {
501: $courseid = substr($courseid, 1);
502: }
503: $courseid =~ s/\//_/;
504: if (($cdom ne 'gcitest') && (($role eq 'cc') || ($role eq 'co'))
505: && ($env{'course.' . $courseid .'.course.helper.not.run'})) {
506: $furl = "/adm/helper/course.initialization.helper";
507: # Send the user to the course they selected
508: } elsif ($env{'request.course.id'}) {
509: if ($env{'form.destinationurl'}) {
510: my $dest = $env{'form.destinationurl'};
511: if ($env{'form.destsymb'} ne '') {
512: my $esc_symb = &HTML::Entities::encode($env{'form.destsymb'},'"<>&');
513: $dest .= '?symb='.$esc_symb;
514: }
515: &redirect_user($r,&mt('Entering [_1]',
516: $env{'course.'.$courseid.'.description'}),
517: $dest,$msg,
518: $env{'environment.remotenavmap'});
519: return OK;
520: }
521: if (&Apache::lonnet::allowed('whn',
522: $env{'request.course.id'})
523: || &Apache::lonnet::allowed('whn',
524: $env{'request.course.id'}.'/'
525: .$env{'request.course.sec'})
526: ) {
527: my $startpage = &courseloadpage($courseid);
528: unless (($startpage eq 'firstres') || ($cdom eq 'gcitest')) {
529: $msg = &mt('Entering [_1] ...',
530: $env{'course.'.$courseid.'.description'});
531: &redirect_user($r,&mt('New in course'),
532: '/adm/whatsnew?refpage=start',$msg,
533: $env{'environment.remotenavmap'});
534: return OK;
535: }
536: }
537: }
538: # Are we allowed to look at the first resource?
539: if ($furl !~ m|^/adm/|) {
540: # Guess not ...
541: $furl=&Apache::lonpageflip::first_accessible_resource();
542: }
543: if (($cdom eq 'gcitest') && ($custommenu)) {
544: $furl = '/adm/navmaps';
545: }
546: $msg = &mt('Entering [_1] ...',
547: $env{'course.'.$courseid.'.description'});
548: &redirect_user($r,&mt('Entering [_1]',
549: $env{'course.'.$courseid.'.description'}),
550: $furl,$msg,
551: $env{'environment.remotenavmap'});
552: }
553: return OK;
554: }
555: }
556: #
557: # Send the user to the construction space they selected
558: if ($role =~ /^(au|ca|aa)$/) {
559: my $redirect_url = '/priv/';
560: if ($role eq 'au') {
561: $redirect_url.=$env{'user.name'};
562: } else {
563: $where =~ /\/(.*)$/;
564: $redirect_url .= $1;
565: }
566: $redirect_url .= '/';
567: &redirect_user($r,&mt('Entering Construction Space'),
568: $redirect_url);
569: return OK;
570: }
571: if ($role eq 'dc') {
572: my $redirect_url = '/adm/menu/';
573: &redirect_user($r,&mt('Loading Domain Coordinator Menu'),
574: $redirect_url);
575: return OK;
576: }
577: if ($role eq 'sc') {
578: my $redirect_url = '/adm/grades?command=scantronupload';
579: &redirect_user($r,&mt('Loading Data Upload Page'),
580: $redirect_url);
581: return OK;
582: }
583: }
584: }
585: }
586: }
587:
588: # =============================================================== No Roles Init
589:
590: &Apache::loncommon::content_type($r,'text/html');
591: &Apache::loncommon::no_cache($r);
592: $r->send_http_header;
593: return OK if $r->header_only;
594:
595: my ($crumbtext,$pagetitle,$recent,$show_course);
596: my $noscript='<span class="LC_error">'.&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.').'<br />'.&mt('As this is not the case, most functionality in the system will be unavailable.').'</span><br />';
597: if ($custommenu) {
598: my $start_page = &Apache::loncommon::start_page('Main Menu',undef,
599: {'bread_crumbs' => 1});
600: $r->print(<<"ENDCUSTOM");
601: $start_page
602: <br />
603: <noscript>
604: $noscript
605: </noscript>
606: ENDCUSTOM
607: } else {
608: $crumbtext = 'User Roles';
609: $pagetitle = 'My Roles';
610: $recent = &mt('Recent Roles');
611: $show_course=&Apache::loncommon::show_course();
612: if ($show_course) {
613: $crumbtext = 'Courses';
614: $pagetitle = 'My Courses';
615: $recent = &mt('Recent Courses');
616: }
617: my $brcrum =[{href=>"/adm/roles",text=>$crumbtext}];
618: my $swinfo=&Apache::lonmenu::rawconfig();
619: my $start_page=&Apache::loncommon::start_page($pagetitle,undef,{bread_crumbs=>$brcrum});
620: my $standby=&mt('Role selected. Please stand by.');
621: $standby=~s/\n/\\n/g;
622: $r->print(<<ENDHEADER);
623: $start_page
624: <br />
625: <noscript>
626: $noscript
627: </noscript>
628: <script type="text/javascript">
629: // <![CDATA[
630: $swinfo
631: window.focus();
632:
633: active=true;
634:
635: function enterrole (thisform,rolecode,buttonname) {
636: if (active) {
637: active=false;
638: document.title='$standby';
639: window.status='$standby';
640: thisform.newrole.value=rolecode;
641: thisform.submit();
642: } else {
643: alert('$standby');
644: }
645: }
646: // ]]>
647: </script>
648: ENDHEADER
649: }
650:
651: # ------------------------------------------ Get Error Message from Environment
652:
653: my ($fn,$priv,$nochoose,$error,$msg)=split(/:/,$env{'user.error.msg'});
654: if ($env{'user.error.msg'}) {
655: $r->log_reason(
656: "$msg for $env{'user.name'} domain $env{'user.domain'} access $priv",$fn);
657: }
658:
659: # ------------------------------------------------- Can this user re-init, etc?
660:
661: my $advanced=$env{'user.adv'};
662: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['tryagain']);
663: my $tryagain=$env{'form.tryagain'};
664: my $reinit=$env{'user.reinit'};
665: delete $env{'user.reinit'};
666:
667: # -------------------------------------------------------- Generate Page Output
668: # --------------------------------------------------------------- Error Header?
669: if ($error) {
670: $r->print("<h1>".&mt('LON-CAPA Access Control')."</h1>");
671: $r->print("<!-- LONCAPAACCESSCONTROLERRORSCREEN --><hr /><pre>");
672: if ($priv ne '') {
673: $r->print(&mt('Access : ').&Apache::lonnet::plaintext($priv)."\n");
674: }
675: if ($fn ne '') {
676: $r->print(&mt('Resource: ').&Apache::lonenc::check_encrypt($fn)."\n");
677: }
678: if ($msg ne '') {
679: $r->print(&mt('Action : ').$msg."\n");
680: }
681: $r->print("</pre><hr />");
682: my $url=$fn;
683: my $last;
684: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
685: &GDBM_READER(),0640)) {
686: $last=$hash{'last_known'};
687: untie(%hash);
688: }
689: if ($last) { $fn.='?symb='.&escape($last); }
690:
691: &Apache::londocs::changewarning($r,undef,'You have modified your course recently, [_1] may fix this access problem.',
692: &Apache::lonenc::check_encrypt($fn));
693: } else {
694: if ($env{'user.error.msg'}) {
695: if ($reinit) {
696: $r->print(
697: '<h3><span class="LC_error">'.
698: &mt('As your session file for the course or community has expired, you will need to re-select it.').'</span></h3>');
699: } else {
700: $r->print(
701: '<h3><span class="LC_error">'.
702: &mt('You need to choose another user role or enter a specific course or community for this function.').
703: '</span></h3>');
704: }
705: }
706: }
707: # -------------------------------------------------------- Choice or no choice?
708: if ($nochoose) {
709: $r->print("<h2>".&mt('Sorry ...')."</h2>\n<span class='LC_error'>".
710: &mt('This action is currently not authorized.').'</span>'.
711: &Apache::loncommon::end_page());
712: return OK;
713: } else {
714: if (($ENV{'REDIRECT_QUERY_STRING'}) && ($fn)) {
715: $fn.='?'.$ENV{'REDIRECT_QUERY_STRING'};
716: }
717: unless ($custommenu) {
718: $r->print('<form method="post" name="rolechoice" action="'.(($fn)?$fn:$r->uri).'">');
719: $r->print('<input type="hidden" name="orgurl" value="'.$fn.'" />');
720: $r->print('<input type="hidden" name="selectrole" value="1" />');
721: $r->print('<input type="hidden" name="newrole" value="" />');
722: }
723: }
724:
725: my (%roletext,%sortrole,%roleclass,%futureroles,%timezones);
726: my ($countactive,$countfuture,$inrole,$possiblerole) =
727: &gather_roles($then,$refresh,$now,$reinit,$nochoose,\%roletext,\%sortrole,\%roleclass,
728: \%futureroles,\%timezones);
729:
730: $refresh = $now;
731: &Apache::lonnet::appenv({'user.refresh.time' => $refresh});
732: if (!$countactive && !$countfuture) {
733: if (&Apache::loncommon::new_roles_update()) {
734: ($countactive,$countfuture,$inrole,$possiblerole) =
735: &gather_roles($then,$refresh,$now,$reinit,$nochoose,\%roletext,\%sortrole,
736: \%roleclass,\%futureroles,\%timezones);
737: }
738: }
739: if ($custommenu) {
740: if ($env{'form.destinationurl'} eq '/adm/gci_info') {
741: $r->print(&gci_info_page()).
742: &Apache::loncommon::end_page();
743: return OK;
744: }
745: my %courses = &Apache::loncommon::existing_gcitest_courses('cc');
746: $env{'browser.interface'}='faketextual';
747: $env{'environment.remote'}='off';
748: my $numcourses = keys(%courses);
749: my $switcher;
750: if ($numcourses > 0) {
751: $switcher = &Apache::lonmainmenu::gcitest_switcher('cc',%courses);
752: my $current;
753: if ($env{'request.course.id'}) {
754: $current = 'cc./'.$env{'course.'.$env{'request.course.id'}.'.domain'}.
755: '/'.$env{'course.'.$env{'request.course.id'}.'.num'};
756: }
757: my $switcher_js = &Apache::lonmainmenu::gcitest_switcher_js($current,$numcourses);
758: $r->print(<<"ENDSCRIPT");
759: <script type="text/javascript">
760: // <![CDATA[
761: $switcher_js
762: // ]]>
763: </script>
764: ENDSCRIPT
765: }
766: $r->print(&Apache::lonmenu::inlinemenu('gcicustom',$switcher).
767: &Apache::loncommon::end_page());
768: return OK;
769: } else {
770: if ($env{'form.destinationurl'} eq '/adm/gci_info') {
771: delete($env{'form.destinationurl'});
772: }
773: }
774: if ($env{'user.adv'}) {
775: $r->print('<p><label><input type="checkbox" name="showall"');
776: if ($env{'form.showall'}) { $r->print(' checked="checked" '); }
777: $r->print(' />'.&mt('Show all roles').'</label>'
778: .' <input type="submit" value="'.&mt('Update display').'" />'
779: .'</p>');
780: } else {
781: if ($countactive > 0) {
782: $r->print(&Apache::loncoursequeueadmin::queued_selfenrollment());
783: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
784: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
785: unless ($env{'user.domain'} eq 'gcitest') {
786: $r->print(
787: '<p>'
788: .&mt('[_1]Visit the [_2]Course/Community Catalog[_3]'
789: .' to view all [_4] LON-CAPA courses and communities.'
790: ,'<b>'
791: ,'<a href="/adm/coursecatalog?showdom='.$esc_dom.'">'
792: ,'</a></b>',$domdesc)
793: .'<br />'
794: .&mt('If a course or community is [_1]not[_2] in your list of current courses and communities below,'
795: .' you may be able to enroll if self-enrollment is permitted.'
796: ,'<b>','</b>')
797: .'</p>'
798: );
799: }
800: }
801: }
802:
803: # No active roles
804: if ($countactive==0) {
805: if ($inrole) {
806: $r->print('<h2>'.&mt('Currently no additional roles, courses or communities').'</h2>');
807: } else {
808: $r->print('<h2>'.&mt('Currently no active roles, courses or communities').'</h2>');
809: }
810: unless ($env{'user.domain'} eq 'gcitest') {
811: &findcourse_advice($r);
812: &requestcourse_advice($r);
813: }
814: $r->print('</form>');
815: if ($countfuture) {
816: $r->print(&mt('The following [quant,_1,role,roles] will become active in the future:',$countfuture));
817: my $doheaders = &roletable_headers($r,\%roleclass,\%sortrole,
818: $nochoose);
819: &print_rolerows($r,$doheaders,\%roleclass,\%sortrole,\%dcroles,
820: \%roletext);
821: my $tremark='';
822: my $tbg;
823: if ($env{'request.role'} eq 'cm') {
824: $tbg="LC_roles_selected";
825: $tremark=&mt('Currently selected.').' ';
826: } else {
827: $tbg="LC_roles_is";
828: }
829: $r->print(&Apache::loncommon::start_data_table_row()
830: .'<td class="'.$tbg.'"> </td>'
831: .'<td colspan="3">'
832: .&mt('No role specified')
833: .'</td>'
834: .'<td>'.$tremark.' </td>'
835: .&Apache::loncommon::end_data_table_row()
836: );
837:
838: $r->print(&Apache::loncommon::end_data_table());
839: }
840: $r->print(&Apache::loncommon::end_page());
841: return OK;
842: } elsif ($countactive==1) { # Is there only one choice?
843: my $needs_switchserver;
844: if ($env{'user.author'}) {
845: $needs_switchserver = &check_needs_switchserver($possiblerole);
846: }
847: if ((!$needs_switchserver) && ($env{'request.role'} eq 'cm')) {
848: $r->print('<h3>'.&mt('Please stand by.').'</h3>'.
849: '<input type="hidden" name="'.$possiblerole.'" value="1" />'.
850: '<noscript><br /><input type="submit" name="submit" value="'.&mt('Continue').'" /></noscript>');
851: $r->print("</form>\n");
852: $r->rflush();
853: $r->print('<script type="text/javascript">document.forms.rolechoice.submit();</script>');
854: $r->print(&Apache::loncommon::end_page());
855: return OK;
856: }
857: if ($needs_switchserver) {
858: $r->print("<h2>".&mt('Server Switch Required')."</h2>\n".
859: &mt('Construction Space access is only available from '.
860: 'the home server of the corresponding Author.').'<br />'.
861: &mt("Click the 'Switch Server' link to go there.").'<br />');
862: }
863: }
864: # ----------------------------------------------------------------------- Table
865: unless ((!&Apache::loncommon::show_course()) || ($nochoose) || ($countactive==1)) {
866: $r->print("<h2>".&mt('Select a Course to Enter')."</h2>\n");
867: }
868: if ($env{'form.destinationurl'}) {
869: $r->print('<input type="hidden" name="destinationurl" value="'.
870: $env{'form.destinationurl'}.'" />');
871: if ($env{'form.destsymb'} ne '') {
872: $r->print('<input type="hidden" name="destsymb" value="'.
873: $env{'form.destsymb'}.'" />');
874: }
875: }
876: my $doheaders = &roletable_headers($r,\%roleclass,\%sortrole,$nochoose);
877: if ($env{'environment.recentroles'}) {
878: my %recent_roles =
879: &Apache::lonhtmlcommon::get_recent('roles',$env{'environment.recentrolesn'});
880: my $output='';
881: foreach (sort(keys(%recent_roles))) {
882: if (ref($roletext{'user.role.'.$_}) eq 'ARRAY') {
883: $output.= &Apache::loncommon::start_data_table_row().
884: $roletext{'user.role.'.$_}->[0].
885: &Apache::loncommon::end_data_table_row().
886: &Apache::loncommon::continue_data_table_row().
887: $roletext{'user.role.'.$_}->[1].
888: &Apache::loncommon::end_data_table_row();
889: if ($_ =~ m-dc\./($match_domain)/-
890: && $dcroles{$1}) {
891: $output .= &adhoc_roles_row($1,'recent');
892: }
893: } elsif ($numdc > 0) {
894: unless ($_ =~/^error\:/) {
895: $output.=&display_cc_role('user.role.'.$_);
896: }
897: }
898: }
899: if ($output) {
900: $r->print(&Apache::loncommon::start_data_table_empty_row()
901: .'<td align="center" colspan="5">'
902: .$recent
903: .'</td>'
904: .&Apache::loncommon::end_data_table_empty_row()
905: );
906: $r->print($output);
907: $doheaders ++;
908: }
909: }
910:
911: if ($numdc > 0) {
912: $r->print(&coursepick_jscript());
913: $r->print(&Apache::loncommon::coursebrowser_javascript().
914: &Apache::loncommon::authorbrowser_javascript());
915: }
916: &print_rolerows($r,$doheaders,\%roleclass,\%sortrole,\%dcroles,\%roletext);
917: if ($countactive > 1) {
918: my $tremark='';
919: my $tbg;
920: if ($env{'request.role'} eq 'cm') {
921: $tbg="LC_roles_selected";
922: $tremark=&mt('Currently selected.').' ';
923: } else {
924: $tbg="LC_roles_is";
925: }
926: $r->print(&Apache::loncommon::start_data_table_row());
927: unless ($nochoose) {
928: if ($env{'request.role'} ne 'cm') {
929: $r->print('<td class="'.$tbg.'"><input type="submit" value="'.
930: &mt('Select').'" name="cm" /></td>');
931: } else {
932: $r->print('<td class="'.$tbg.'"> </td>');
933: }
934: }
935: $r->print('<td colspan="3">'
936: .&mt('No role specified')
937: .'</td>'
938: .'<td>'.$tremark.' </td>'
939: .&Apache::loncommon::end_data_table_row()
940: );
941: }
942: $r->print(&Apache::loncommon::end_data_table());
943: unless ($nochoose) {
944: $r->print("</form>\n");
945: }
946: # ------------------------------------------------------------ Privileges Info
947: if (($advanced) && (($env{'user.error.msg'}) || ($error))) {
948: $r->print('<hr /><h2>'.&mt('Current Privileges').'</h2>');
949: $r->print(&privileges_info());
950: }
951: $r->print(&Apache::lonnet::getannounce());
952: if ($advanced) {
953: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
954: $r->print('<p><small><i>'
955: .&mt('This LON-CAPA server is version [_1]',$r->dir_config('lonVersion'))
956: .'</i><br />'
957: .'<a href="/adm/logout">'.&mt('Logout').'</a> '
958: .'<a href="/adm/coursecatalog?showdom='.$esc_dom.'">'
959: .&mt('Course/Community Catalog')
960: .'</a></small></p>');
961: }
962: $r->print(&Apache::loncommon::end_page());
963: return OK;
964: }
965:
966: sub gci_info_page {
967: return <<"END";
968: <h2>Welcome to the Geoscience Concept Inventory WebCenter</h2>
969: <p>
970: Use the tabs to navigate the WebCenter and...
971: <ul>
972: <li>Review and comment on existing GCI questions</li>
973: <li>Submit a GCI question of your own</li>
974: <li>Create an online test for your students</li>
975: </ul>
976: </p>
977: <p>For more information about writing and reviewing Concept Inventory questions
978: please refer to the <a href="/res/gci/gci/internal/pdfs/GCIWorkbook.pdf">GCI Workbook</a>.
979:
980: END
981: }
982:
983: sub gather_roles {
984: my ($then,$refresh,$now,$reinit,$nochoose,$roletext,$sortrole,$roleclass,$futureroles,$timezones) = @_;
985: my ($countactive,$countfuture,$inrole,$possiblerole) = (0,0,0,'');
986: my $advanced = $env{'user.adv'};
987: my $tryagain = $env{'form.tryagain'};
988: foreach my $envkey (sort(keys(%env))) {
989: my $button = 1;
990: my $switchserver='';
991: my ($role_text,$role_text_end,$sortkey);
992: if ($envkey=~/^user\.role\./) {
993: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus,$tpstart,$tpend);
994: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
995: \$trolecode,\$tstatus,\$tstart,\$tend);
996: next if (!defined($role) || $role eq '' || $role =~ /^gr/);
997: my $timezone = &role_timezone($where,$timezones);
998: $tremark='';
999: $tpstart=' ';
1000: $tpend=' ';
1001: if ($tstart) {
1002: $tpstart=&Apache::lonlocal::locallocaltime($tstart,$timezone);
1003: }
1004: if ($tend) {
1005: $tpend=&Apache::lonlocal::locallocaltime($tend,$timezone);
1006: }
1007: if ($env{'request.role'} eq $trolecode) {
1008: $tstatus='selected';
1009: }
1010: my $tbg;
1011: if (($tstatus eq 'is')
1012: || ($tstatus eq 'selected')
1013: || ($tstatus eq 'future')
1014: || ($env{'form.showall'})) {
1015: if ($tstatus eq 'is') {
1016: $tbg='LC_roles_is';
1017: $possiblerole=$trolecode;
1018: $countactive++;
1019: } elsif ($tstatus eq 'future') {
1020: $tbg='LC_roles_future';
1021: $button=0;
1022: $futureroles->{$trolecode} = $tstart.':'.$tend;
1023: $countfuture ++;
1024: } elsif ($tstatus eq 'expired') {
1025: $tbg='LC_roles_expired';
1026: $button=0;
1027: } elsif ($tstatus eq 'will_not') {
1028: $tbg='LC_roles_will_not';
1029: $tremark.=&mt('Expired after logout.').' ';
1030: } elsif ($tstatus eq 'selected') {
1031: $tbg='LC_roles_selected';
1032: $inrole=1;
1033: $countactive++;
1034: $tremark.=&mt('Currently selected.').' ';
1035: }
1036: my $trole;
1037: if ($role =~ /^cr\//) {
1038: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$role);
1039: if ($tremark) { $tremark.='<br />'; }
1040: $tremark.=&mt('Defined by [_1] at [_2].',$rauthor,$rdomain);
1041: }
1042: $trole=Apache::lonnet::plaintext($role);
1043: my $ttype;
1044: my $twhere;
1045: my ($tdom,$trest,$tsection)=
1046: split(/\//,Apache::lonnet::declutter($where));
1047: # First, Co-Authorship roles
1048: if (($role eq 'ca') || ($role eq 'aa')) {
1049: my $home = &Apache::lonnet::homeserver($trest,$tdom);
1050: my $allowed=0;
1051: my @ids=&Apache::lonnet::current_machine_ids();
1052: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
1053: if (!$allowed) {
1054: $button=0;
1055: $switchserver='otherserver='.$home.'&role='.$trolecode;
1056: }
1057: #next if ($home eq 'no_host');
1058: $home = &Apache::lonnet::hostname($home);
1059: $ttype='Construction Space';
1060: $twhere=&mt('User').': '.$trest.'<br />'.&mt('Domain').
1061: ': '.$tdom.'<br />'.
1062: ' '.&mt('Server').': '.$home;
1063: $env{'course.'.$tdom.'_'.$trest.'.description'}='ca';
1064: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$trest.'/');
1065: $sortkey=$role."$trest:$tdom";
1066: } elsif ($role eq 'au') {
1067: # Authors
1068: my $home = &Apache::lonnet::homeserver
1069: ($env{'user.name'},$env{'user.domain'});
1070: my $allowed=0;
1071: my @ids=&Apache::lonnet::current_machine_ids();
1072: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
1073: if (!$allowed) {
1074: $button=0;
1075: $switchserver='otherserver='.$home.'&role='.$trolecode;
1076: }
1077: #next if ($home eq 'no_host');
1078: $home = &Apache::lonnet::hostname($home);
1079: $ttype='Construction Space';
1080: $twhere=&mt('Domain').': '.$tdom.'<br />'.&mt('Server').
1081: ': '.$home;
1082: $env{'course.'.$tdom.'_'.$trest.'.description'}='ca';
1083: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$env{'user.name'}.'/');
1084: $sortkey=$role;
1085: } elsif ($trest) {
1086: my $tcourseid=$tdom.'_'.$trest;
1087: $ttype = &Apache::loncommon::course_type($tcourseid);
1088: $trole = &Apache::lonnet::plaintext($role,$ttype,$tcourseid);
1089: if ($env{'course.'.$tcourseid.'.description'}) {
1090: $twhere=$env{'course.'.$tcourseid.'.description'};
1091: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
1092: unless ($twhere eq &mt('Currently not available')) {
1093: $twhere.=' <span class="LC_fontsize_small">'.
1094: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
1095: '</span>';
1096: }
1097: } else {
1098: my %newhash=&Apache::lonnet::coursedescription($tcourseid);
1099: if (%newhash) {
1100: $sortkey=$role."\0".$tdom."\0".$newhash{'description'}.
1101: "\0".$envkey;
1102: $twhere=$newhash{'description'}.
1103: ' <span class="LC_fontsize_small">'.
1104: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
1105: '</span>';
1106: $ttype = $newhash{'type'};
1107: $trole = &Apache::lonnet::plaintext($role,$ttype,$tcourseid);
1108: } else {
1109: $twhere=&mt('Currently not available');
1110: $env{'course.'.$tcourseid.'.description'}=$twhere;
1111: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
1112: $ttype = 'Unavailable';
1113: }
1114: }
1115: if ($tsection) {
1116: $twhere.='<br />'.&mt('Section').': '.$tsection;
1117: }
1118: if ($role ne 'st') { $twhere.="<br />".&mt('Domain').":".$tdom; }
1119: } elsif ($tdom) {
1120: $ttype='Domain';
1121: $twhere=$tdom;
1122: $sortkey=$role.$twhere;
1123: } else {
1124: $ttype='System';
1125: $twhere=&mt('system wide');
1126: $sortkey=$role.$twhere;
1127: }
1128: ($role_text,$role_text_end) =
1129: &build_roletext($trolecode,$tdom,$trest,$tstatus,$tryagain,
1130: $advanced,$tremark,$tbg,$trole,$twhere,$tpstart,
1131: $tpend,$nochoose,$button,$switchserver,$reinit);
1132: $roletext->{$envkey}=[$role_text,$role_text_end];
1133: if (!$sortkey) {$sortkey=$twhere."\0".$envkey;}
1134: $sortrole->{$sortkey}=$envkey;
1135: $roleclass->{$envkey}=$ttype;
1136: }
1137: }
1138: }
1139: return ($countactive,$countfuture,$inrole,$possiblerole);
1140: }
1141:
1142: sub role_timezone {
1143: my ($where,$timezones) = @_;
1144: my $timezone;
1145: if (ref($timezones) eq 'HASH') {
1146: if ($where =~ m{^/($match_domain)/($match_courseid)}) {
1147: my $cdom = $1;
1148: my $cnum = $2;
1149: if ($cdom && $cnum) {
1150: if (!exists($timezones->{$cdom.'_'.$cnum})) {
1151: my %timehash =
1152: &Apache::lonnet::get('environment',['timezone'],$cdom,$cnum);
1153: if ($timehash{'timezone'} eq '') {
1154: if (!exists($timezones->{$cdom})) {
1155: my %domdefaults =
1156: &Apache::lonnet::get_domain_defaults($cdom);
1157: if ($domdefaults{'timezone_def'} eq '') {
1158: $timezones->{$cdom} = 'local';
1159: } else {
1160: $timezones->{$cdom} = $domdefaults{'timezone_def'};
1161: }
1162: }
1163: $timezones->{$cdom.'_'.$cnum} = $timezones->{$cdom};
1164: } else {
1165: $timezones->{$cdom.'_'.$cnum} =
1166: &Apache::lonlocal::gettimezone($timehash{'timezone'});
1167: }
1168: }
1169: $timezone = $timezones->{$cdom.'_'.$cnum};
1170: }
1171: } else {
1172: my ($tdom) = ($where =~ m{^/($match_domain)});
1173: if ($tdom) {
1174: if (!exists($timezones->{$tdom})) {
1175: my %domdefaults = &Apache::lonnet::get_domain_defaults($tdom);
1176: if ($domdefaults{'timezone_def'} eq '') {
1177: $timezones->{$tdom} = 'local';
1178: } else {
1179: $timezones->{$tdom} = $domdefaults{'timezone_def'};
1180: }
1181: }
1182: $timezone = $timezones->{$tdom};
1183: }
1184: }
1185: if ($timezone eq 'local') {
1186: $timezone = undef;
1187: }
1188: }
1189: return $timezone;
1190: }
1191:
1192: sub roletable_headers {
1193: my ($r,$roleclass,$sortrole,$nochoose) = @_;
1194: my $doheaders;
1195: if ((ref($sortrole) eq 'HASH') && (ref($roleclass) eq 'HASH')) {
1196: $r->print('<br />'
1197: .&Apache::loncommon::start_data_table()
1198: .&Apache::loncommon::start_data_table_header_row()
1199: );
1200: if (!$nochoose) { $r->print('<th> </th>'); }
1201: $r->print('<th>'.&mt('User Role').'</th>'
1202: .'<th>'.&mt('Extent').'</th>'
1203: .'<th>'.&mt('Start').'</th>'
1204: .'<th>'.&mt('End').'</th>'
1205: .&Apache::loncommon::end_data_table_header_row()
1206: );
1207: $doheaders=-1;
1208: my @roletypes = &roletypes();
1209: foreach my $type (@roletypes) {
1210: my $haverole=0;
1211: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%{$sortrole}))) {
1212: if ($roleclass->{$sortrole->{$which}} =~ /^\Q$type\E/) {
1213: $haverole=1;
1214: }
1215: }
1216: if ($haverole) { $doheaders++; }
1217: }
1218: }
1219: return $doheaders;
1220: }
1221:
1222: sub roletypes {
1223: my @types = ('Domain','Construction Space','Course','Community','Unavailable','System');
1224: return @types;
1225: }
1226:
1227: sub print_rolerows {
1228: my ($r,$doheaders,$roleclass,$sortrole,$dcroles,$roletext) = @_;
1229: if ((ref($roleclass) eq 'HASH') && (ref($sortrole) eq 'HASH')) {
1230: my @types = &roletypes();
1231: foreach my $type (@types) {
1232: my $output;
1233: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%{$sortrole}))) {
1234: if ($roleclass->{$sortrole->{$which}} =~ /^\Q$type\E/) {
1235: if (ref($roletext) eq 'HASH') {
1236: if (ref($roletext->{$sortrole->{$which}}) eq 'ARRAY') {
1237: $output.= &Apache::loncommon::start_data_table_row().
1238: $roletext->{$sortrole->{$which}}->[0].
1239: &Apache::loncommon::end_data_table_row().
1240: &Apache::loncommon::continue_data_table_row().
1241: $roletext->{$sortrole->{$which}}->[1].
1242: &Apache::loncommon::end_data_table_row();
1243: }
1244: if ($sortrole->{$which} =~ m-dc\./($match_domain)/-) {
1245: if (ref($dcroles) eq 'HASH') {
1246: if ($dcroles->{$1}) {
1247: $output .= &adhoc_roles_row($1,'');
1248: }
1249: }
1250: }
1251: }
1252: }
1253: }
1254: if ($output) {
1255: if ($doheaders > 0) {
1256: $r->print(&Apache::loncommon::start_data_table_empty_row()
1257: .'<td align="center" colspan="5">'
1258: .&mt($type)
1259: .'</td>'
1260: .&Apache::loncommon::end_data_table_empty_row()
1261: );
1262: }
1263: $r->print($output);
1264: }
1265: }
1266: }
1267: }
1268:
1269: sub findcourse_advice {
1270: my ($r) = @_;
1271: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
1272: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
1273: if (&Apache::lonnet::auto_run(undef,$env{'user.domain'})) {
1274: $r->print(&mt('If you were expecting to see an active role listed for a particular course in the [_1] domain, it may be missing for one of the following reasons:',$domdesc).'
1275: <ul>
1276: <li>'.&mt('The course has yet to be created.').'</li>
1277: <li>'.&mt('Automatic enrollment of registered students has not been enabled for the course.').'</li>
1278: <li>'.&mt('You are in a section of course for which automatic enrollment in the corresponding LON-CAPA course is not active.').'</li>
1279: <li>'.&mt('The start date for automated enrollment has yet to be reached.').'</li>
1280: <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>
1281: </ul>');
1282: } else {
1283: $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 />');
1284: }
1285: $r->print('<h3>'.&mt('Self-Enrollment').'</h3>'.
1286: '<p>'.&mt('The [_1]Course/Community Catalog[_2] provides information about all [_3] classes for which LON-CAPA courses have been created, as well as any communities in the domain.','<a href="/adm/coursecatalog?showdom='.$esc_dom.'">','</a>',$domdesc).'<br />');
1287: $r->print(&mt('You can search for courses and communities which permit self-enrollment, if you would like to enroll in one.').'</p>'.
1288: &Apache::loncoursequeueadmin::queued_selfenrollment());
1289: return;
1290: }
1291:
1292: sub requestcourse_advice {
1293: my ($r) = @_;
1294: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
1295: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
1296: my (%can_request,%request_doms);
1297: &Apache::lonnet::check_can_request($env{'user.domain'},\%can_request,\%request_doms);
1298: if (keys(%request_doms) > 0) {
1299: my ($types,$typename) = &Apache::loncommon::course_types();
1300: if ((ref($types) eq 'ARRAY') && (ref($typename) eq 'HASH')) {
1301: $r->print('<h3>'.&mt('Request creation of a course or community').'</h3>'.
1302: '<p>'.&mt('You have rights to request the creation of courses and/or communities in the following domain(s):').'<ul>');
1303: my (@reqdoms,@reqtypes);
1304: foreach my $type (sort(keys(%request_doms))) {
1305: push(@reqtypes,$type);
1306: if (ref($request_doms{$type}) eq 'ARRAY') {
1307: my $domstr = join(', ',map { &Apache::lonnet::domain($_) } sort(@{$request_doms{$type}}));
1308: $r->print(
1309: '<li>'
1310: .&mt('[_1]'.$typename->{$type}.'[_2] in domain: [_3]',
1311: '<i>',
1312: '</i>',
1313: '<b>'.$domstr.'</b>')
1314: .'</li>'
1315: );
1316: foreach my $dom (@{$request_doms{$type}}) {
1317: unless (grep(/^\Q$dom\E/,@reqdoms)) {
1318: push(@reqdoms,$dom);
1319: }
1320: }
1321: }
1322: }
1323: my @showtypes;
1324: foreach my $type (@{$types}) {
1325: if (grep(/^\Q$type\E$/,@reqtypes)) {
1326: push(@showtypes,$type);
1327: }
1328: }
1329: my $requrl = '/adm/requestcourse';
1330: if (@reqdoms == 1) {
1331: $requrl .= '?showdom='.$reqdoms[0];
1332: }
1333: if (@showtypes > 0) {
1334: $requrl.=(($requrl=~/\?/)?'&':'?').'crstype='.$showtypes[0];
1335: }
1336: if (@reqdoms == 1 || @showtypes > 0) {
1337: $requrl .= '&state=crstype&action=new';
1338: }
1339: $r->print('</ul>'.&mt('Use the [_1]request form[_2] to submit a request for creation of a new course or community.','<a href="'.$requrl.'">','</a>').'</p>');
1340: }
1341: }
1342: return;
1343: }
1344:
1345: sub privileges_info {
1346: my ($which) = @_;
1347: my $output;
1348:
1349: $which ||= $env{'request.role'};
1350:
1351: foreach my $envkey (sort(keys(%env))) {
1352: next if ($envkey!~/^user\.priv\.\Q$which\E\.(.*)/);
1353:
1354: my $where=$1;
1355: my $ttype;
1356: my $twhere;
1357: my (undef,$tdom,$trest,$tsec)=split(m{/},$where);
1358: if ($trest) {
1359: if ($env{'course.'.$tdom.'_'.$trest.'.description'} eq 'ca') {
1360: $ttype='Construction Space';
1361: $twhere='User: '.$trest.', Domain: '.$tdom;
1362: } else {
1363: $ttype= &Apache::loncommon::course_type($tdom.'_'.$trest);
1364: $twhere=$env{'course.'.$tdom.'_'.$trest.'.description'};
1365: if ($tsec) {
1366: my $sec_type = 'Section';
1367: if (exists($env{"user.role.gr.$where"})) {
1368: $sec_type = 'Group';
1369: }
1370: $twhere.=' ('.$sec_type.': '.$tsec.')';
1371: }
1372: }
1373: } elsif ($tdom) {
1374: $ttype='Domain';
1375: $twhere=$tdom;
1376: } else {
1377: $ttype='System';
1378: $twhere='/';
1379: }
1380: $output .= "\n<h3>".&mt($ttype).': '.$twhere.'</h3>'."\n<ul>";
1381: foreach my $priv (sort(split(/:/,$env{$envkey}))) {
1382: next if (!$priv);
1383:
1384: my ($prv,$restr)=split(/\&/,$priv);
1385: my $trestr='';
1386: if ($restr ne 'F') {
1387: $trestr.=' ('.
1388: join(', ',
1389: map { &Apache::lonnet::plaintext($_) }
1390: (split('',$restr))).') ';
1391: }
1392: $output .= "\n\t".
1393: '<li>'.&Apache::lonnet::plaintext($prv).$trestr.'</li>';
1394: }
1395: $output .= "\n".'</ul>';
1396: }
1397: return $output;
1398: }
1399:
1400: sub build_roletext {
1401: my ($trolecode,$tdom,$trest,$tstatus,$tryagain,$advanced,$tremark,$tbg,$trole,$twhere,$tpstart,$tpend,$nochoose,$button,$switchserver,$reinit) = @_;
1402: my ($roletext,$roletext_end);
1403: my $is_dc=($trolecode =~ m/^dc\./);
1404: my $rowspan=($is_dc) ? ''
1405: : ' rowspan="2" ';
1406:
1407: unless ($nochoose) {
1408: my $buttonname=$trolecode;
1409: $buttonname=~s/\W//g;
1410: if (!$button) {
1411: if ($switchserver) {
1412: $roletext.='<td'.$rowspan.' class="'.$tbg.'">'
1413: .'<a href="/adm/switchserver?'.$switchserver.'">'
1414: .&mt('Switch Server')
1415: .'</a></td>';
1416: } else {
1417: $roletext.=('<td'.$rowspan.' class="'.$tbg.'"> </td>');
1418: }
1419: } elsif ($tstatus eq 'is') {
1420: $roletext.='<td'.$rowspan.' class="'.$tbg.'">'.
1421: '<input name="'.$buttonname.'" type="button" value="'.
1422: &mt('Select').'" onclick="javascript:enterrole(this.form,\''.
1423: $trolecode."','".$buttonname.'\');" /></td>';
1424: } elsif ($tryagain) {
1425: $roletext.=
1426: '<td'.$rowspan.' class="'.$tbg.'">'.
1427: '<input name="'.$buttonname.'" type="button" value="'.
1428: &mt('Try Selecting Again').'" onclick="javascript:enterrole(this.form,\''.
1429: $trolecode."','".$buttonname.'\');" /></td>';
1430: } elsif ($advanced) {
1431: $roletext.=
1432: '<td'.$rowspan.' class="'.$tbg.'">'.
1433: '<input name="'.$buttonname.'" type="button" value="'.
1434: &mt('Re-Initialize').'" onclick="javascript:enterrole(this.form,\''.
1435: $trolecode."','".$buttonname.'\');" /></td>';
1436: } elsif ($reinit) {
1437: $roletext.=
1438: '<td'.$rowspan.' class="'.$tbg.'">'.
1439: '<input name="'.$buttonname.'" type="button" value="'.
1440: &mt('Re-Select').'" onclick="javascript:enterrole(this.form,\''.
1441: $trolecode."','".$buttonname.'\');" /></td>';
1442: } else {
1443: $roletext.=
1444: '<td'.$rowspan.' class="'.$tbg.'">'.
1445: '<input name="'.$buttonname.'" type="button" value="'.
1446: &mt('Re-Select').'" onclick="javascript:enterrole(this.form,\''.
1447: $trolecode."','".$buttonname.'\');" /></td>';
1448: }
1449: }
1450: if ($trolecode !~ m/^(dc|ca|au|aa)\./) {
1451: $tremark.=&Apache::lonannounce::showday(time,1,
1452: &Apache::lonannounce::readcalendar($tdom.'_'.$trest));
1453: }
1454: $roletext.='<td>'.$trole.'</td>'
1455: .'<td>'.$twhere.'</td>'
1456: .'<td>'.$tpstart.'</td>'
1457: .'<td>'.$tpend.'</td>';
1458: if (!$is_dc) {
1459: $roletext_end = '<td colspan="4">'.
1460: $tremark.' '.
1461: '</td>';
1462: }
1463: return ($roletext,$roletext_end);
1464: }
1465:
1466: sub check_needs_switchserver {
1467: my ($possiblerole) = @_;
1468: my $needs_switchserver;
1469: my ($role,$where) = split(/\./,$possiblerole,2);
1470: my (undef,$tdom,$twho) = split(/\//,$where);
1471: my ($server_status,$home);
1472: if (($role eq 'ca') || ($role eq 'aa')) {
1473: ($server_status,$home) = &check_author_homeserver($twho,$tdom);
1474: } else {
1475: ($server_status,$home) = &check_author_homeserver($env{'user.name'},
1476: $env{'user.domain'});
1477: }
1478: if ($server_status eq 'switchserver') {
1479: $needs_switchserver = 1;
1480: }
1481: return $needs_switchserver;
1482: }
1483:
1484: sub check_author_homeserver {
1485: my ($uname,$udom)=@_;
1486: if (($uname eq '') || ($udom eq '')) {
1487: return ('fail','');
1488: }
1489: my $home = &Apache::lonnet::homeserver($uname,$udom);
1490: if (&Apache::lonnet::host_domain($home) ne $udom) {
1491: return ('fail',$home);
1492: }
1493: my @ids=&Apache::lonnet::current_machine_ids();
1494: if (grep(/^\Q$home\E$/,@ids)) {
1495: return ('ok',$home);
1496: } else {
1497: return ('switchserver',$home);
1498: }
1499: }
1500:
1501: sub check_fordc {
1502: my ($dcroles,$then) = @_;
1503: my $numdc = 0;
1504: if ($env{'user.adv'}) {
1505: foreach my $envkey (sort keys %env) {
1506: if ($envkey=~/^user\.role\.dc\.\/($match_domain)\/$/) {
1507: my $dcdom = $1;
1508: my $livedc = 1;
1509: my ($tstart,$tend)=split(/\./,$env{$envkey});
1510: if ($tstart && $tstart>$then) { $livedc = 0; }
1511: if ($tend && $tend <$then) { $livedc = 0; }
1512: if ($livedc) {
1513: $$dcroles{$dcdom} = $envkey;
1514: $numdc++;
1515: }
1516: }
1517: }
1518: }
1519: return $numdc;
1520: }
1521:
1522: sub adhoc_course_role {
1523: my ($refresh,$then) = @_;
1524: my ($cdom,$cnum,$crstype);
1525: $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1526: $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
1527: $crstype = &Apache::loncommon::course_type();
1528: if (&check_forcc($cdom,$cnum,$refresh,$then,$crstype)) {
1529: my $setprivs;
1530: if (!defined($env{'user.role.'.$env{'form.switchrole'}})) {
1531: $setprivs = 1;
1532: } else {
1533: my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.switchrole'}});
1534: if (($start && ($start>$refresh || $start == -1)) ||
1535: ($end && $end<$then)) {
1536: $setprivs = 1;
1537: }
1538: }
1539: if ($setprivs) {
1540: if ($env{'form.switchrole'} =~ m-^(in|ta|ep|ad|st|cr)([\w/]*)\./\Q$cdom\E/\Q$cnum\E/?(\w*)$-) {
1541: my $role = $1;
1542: my $custom_role = $2;
1543: my $usec = $3;
1544: if ($role eq 'cr') {
1545: if ($custom_role =~ m-^/$match_domain/$match_username/\w+$-) {
1546: $role .= $custom_role;
1547: } else {
1548: return;
1549: }
1550: }
1551: my (%userroles,%newrole,%newgroups,%group_privs);
1552: my %cgroups =
1553: &Apache::lonnet::get_active_groups($env{'user.domain'},
1554: $env{'user.name'},$cdom,$cnum);
1555: foreach my $group (keys(%cgroups)) {
1556: $group_privs{$group} =
1557: $env{'user.priv.cc./'.$cdom.'/'.$cnum.'./'.$cdom.'/'.$cnum.'/'.$group};
1558: }
1559: $newgroups{'/'.$cdom.'/'.$cnum} = \%group_privs;
1560: my $area = '/'.$cdom.'/'.$cnum;
1561: my $spec = $role.'.'.$area;
1562: if ($usec ne '') {
1563: $spec .= '/'.$usec;
1564: $area .= '/'.$usec;
1565: }
1566: &Apache::lonnet::standard_roleprivs(\%newrole,$role,$cdom,$spec,$cnum,$area);
1567: &Apache::lonnet::set_userprivs(\%userroles,\%newrole,\%newgroups);
1568: my $adhocstart = $refresh-1;
1569: $userroles{'user.role.'.$spec} = $adhocstart.'.';
1570: &Apache::lonnet::appenv(\%userroles,[$role,'cm']);
1571: }
1572: }
1573: }
1574: return;
1575: }
1576:
1577: sub check_forcc {
1578: my ($cdom,$cnum,$refresh,$then,$crstype) = @_;
1579: my ($is_cc,$ccrole);
1580: if ($crstype eq 'Community') {
1581: $ccrole = 'co';
1582: } else {
1583: $ccrole = 'cc';
1584: }
1585: if ($cdom ne '' && $cnum ne '') {
1586: if (&Apache::lonnet::is_course($cdom,$cnum)) {
1587: my $envkey = 'user.role.'.$ccrole.'./'.$cdom.'/'.$cnum;
1588: if (defined($env{$envkey})) {
1589: $is_cc = 1;
1590: my ($tstart,$tend)=split(/\./,$env{$envkey});
1591: if ($tstart && $tstart>$refresh) { $is_cc = 0; }
1592: if ($tend && $tend <$then) { $is_cc = 0; }
1593: }
1594: }
1595: }
1596: return $is_cc;
1597: }
1598:
1599: sub courselink {
1600: my ($dcdom,$rowtype) = @_;
1601: my $courseform=&Apache::loncommon::selectcourse_link
1602: ('rolechoice','dccourse'.$rowtype.'_'.$dcdom,
1603: 'dcdomain'.$rowtype.'_'.$dcdom,'coursedesc'.$rowtype.'_'.
1604: $dcdom,$dcdom,undef,'Course/Community');
1605: my $hiddenitems = '<input type="hidden" name="dcdomain'.$rowtype.'_'.$dcdom.'" value="'.$dcdom.'" />'.
1606: '<input type="hidden" name="origdom'.$rowtype.'_'.$dcdom.'" value="'.$dcdom.'" />'.
1607: '<input type="hidden" name="dccourse'.$rowtype.'_'.$dcdom.'" value="" />'.
1608: '<input type="hidden" name="coursedesc'.$rowtype.'_'.$dcdom.'" value="" />';
1609: return $courseform.$hiddenitems;
1610: }
1611:
1612: sub coursepick_jscript {
1613: my %lt = &Apache::lonlocal::texthash(
1614: 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.",
1615: youc => 'You can only use this screen to select courses and communities in the current domain.',
1616: );
1617: my $verify_script = <<"END";
1618: <script type="text/javascript">
1619: // <![CDATA[
1620: function verifyCoursePick(caller) {
1621: var numbutton = getIndex(caller)
1622: var pickedCourse = document.rolechoice.elements[numbutton+4].value
1623: var pickedDomain = document.rolechoice.elements[numbutton+2].value
1624: if (document.rolechoice.elements[numbutton+2].value == document.rolechoice.elements[numbutton+3].value) {
1625: if (pickedCourse != '') {
1626: if (numbutton != -1) {
1627: var courseTarget = "cc./"+pickedDomain+"/"+pickedCourse
1628: document.rolechoice.elements[numbutton+1].name = courseTarget
1629: document.rolechoice.submit()
1630: }
1631: }
1632: else {
1633: alert("$lt{'plsu'}");
1634: }
1635: }
1636: else {
1637: alert("$lt{'youc'}")
1638: }
1639: }
1640: function getIndex(caller) {
1641: for (var i=0;i<document.rolechoice.elements.length;i++) {
1642: if (document.rolechoice.elements[i] == caller) {
1643: return i;
1644: }
1645: }
1646: return -1;
1647: }
1648: // ]]>
1649: </script>
1650: END
1651: return $verify_script;
1652: }
1653:
1654: sub coauthorlink {
1655: my ($dcdom,$rowtype) = @_;
1656: my $coauthorform=&Apache::loncommon::selectauthor_link('rolechoice',$dcdom);
1657: my $hiddenitems = '<input type="hidden" name="adhoccauname'.$rowtype.'_'.$dcdom.'" value="" />';
1658: return $coauthorform.$hiddenitems;
1659: }
1660:
1661: sub display_cc_role {
1662: my $rolekey = shift;
1663: my ($roletext,$roletext_end);
1664: my $advanced = $env{'user.adv'};
1665: my $tryagain = $env{'form.tryagain'};
1666: unless ($rolekey =~/^error\:/) {
1667: if ($rolekey =~ m{^user\.role\.(cc|co)\./($match_domain)/($match_courseid)$}) {
1668: my $ccrole = $1;
1669: my $tcourseid = $2.'_'.$3;
1670: my $trolecode = $1.'./'.$2.'/'.$3;
1671: my $twhere;
1672: my $ttype;
1673: my $tbg='LC_roles_is';
1674: my %newhash=&Apache::lonnet::coursedescription($tcourseid);
1675: if (%newhash) {
1676: $twhere=$newhash{'description'}.
1677: ' <span style="LC_fontsize_small">'.
1678: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$2,$1).
1679: '</span>';
1680: $ttype = $newhash{'type'};
1681: } else {
1682: $twhere=&mt('Currently not available');
1683: $env{'course.'.$tcourseid.'.description'}=$twhere;
1684: }
1685: my $trole = &Apache::lonnet::plaintext($ccrole,$ttype,$tcourseid);
1686: $twhere.="<br />".&mt('Domain').":".$1;
1687: ($roletext,$roletext_end) = &build_roletext($trolecode,$1,$2,'is',$tryagain,$advanced,'',$tbg,$trole,$twhere,'','','',1,'');
1688: }
1689: }
1690: return ($roletext,$roletext_end);
1691: }
1692:
1693: sub adhoc_roles_row {
1694: my ($dcdom,$rowtype) = @_;
1695: my $output = &Apache::loncommon::continue_data_table_row()
1696: .' <td colspan="5">'
1697: .&mt('[_1]Ad hoc[_2] roles in domain [_3] --'
1698: ,'<span class="LC_cusr_emph">','</span>',$dcdom)
1699: .' ';
1700: my $selectcclink = &courselink($dcdom,$rowtype);
1701: my $ccrole = &Apache::lonnet::plaintext('co',undef,undef,1);
1702: my $carole = &Apache::lonnet::plaintext('ca');
1703: my $selectcalink = &coauthorlink($dcdom,$rowtype);
1704: $output.=$ccrole.': '.$selectcclink
1705: .' | '.$carole.': '.$selectcalink
1706: .&Apache::loncommon::end_data_table_row();
1707: return $output;
1708: }
1709:
1710: sub recent_filename {
1711: my $area=shift;
1712: return 'nohist_recent_'.&escape($area);
1713: }
1714:
1715: sub courseloadpage {
1716: my ($courseid) = @_;
1717: my $startpage;
1718: my %entry_settings = &Apache::lonnet::get('nohist_whatsnew',
1719: [$courseid.':courseinit']);
1720: my ($tmp) = %entry_settings;
1721: unless ($tmp =~ /^error: 2 /) {
1722: $startpage = $entry_settings{$courseid.':courseinit'};
1723: }
1724: if ($startpage eq '') {
1725: if (exists($env{'environment.course_init_display'})) {
1726: $startpage = $env{'environment.course_init_display'};
1727: }
1728: }
1729: return $startpage;
1730: }
1731:
1732: 1;
1733: __END__
1734:
1735: =head1 NAME
1736:
1737: Apache::lonroles - User Roles Screen
1738:
1739: =head1 SYNOPSIS
1740:
1741: Invoked by /etc/httpd/conf/srm.conf:
1742:
1743: <Location /adm/roles>
1744: PerlAccessHandler Apache::lonacc
1745: SetHandler perl-script
1746: PerlHandler Apache::lonroles
1747: ErrorDocument 403 /adm/login
1748: ErrorDocument 500 /adm/errorhandler
1749: </Location>
1750:
1751: =head1 OVERVIEW
1752:
1753: =head2 Choosing Roles
1754:
1755: C<lonroles> is a handler that allows a user to switch roles in
1756: mid-session. LON-CAPA attempts to work with "No Role Specified", the
1757: default role that a user has before selecting a role, as widely as
1758: possible, but certain handlers for example need specification which
1759: course they should act on, etc. Both in this scenario, and when the
1760: handler determines via C<lonnet>'s C<&allowed> function that a certain
1761: action is not allowed, C<lonroles> is used as error handler. This
1762: allows the user to select another role which may have permission to do
1763: what they were trying to do. C<lonroles> can also be accessed via the
1764: B<CRS> button in the Remote Control.
1765:
1766: =begin latex
1767:
1768: \begin{figure}
1769: \begin{center}
1770: \includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen}
1771: \caption{\label{Sample_Roles_Screen}Sample Roles Screen}
1772: \end{center}
1773: \end{figure}
1774:
1775: =end latex
1776:
1777: =head2 Role Initialization
1778:
1779: 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.
1780:
1781: =head1 INTRODUCTION
1782:
1783: This module enables a user to select what role he wishes to
1784: operate under (instructor, student, teaching assistant, course
1785: coordinator, etc). These roles are pre-established by the actions
1786: of upper-level users.
1787:
1788: This is part of the LearningOnline Network with CAPA project
1789: described at http://www.lon-capa.org.
1790:
1791: =head1 HANDLER SUBROUTINE
1792:
1793: This routine is called by Apache and mod_perl.
1794:
1795: =over 4
1796:
1797: =item *
1798:
1799: Roles Initialization (yes/no)
1800:
1801: =item *
1802:
1803: Get Error Message from Environment
1804:
1805: =item *
1806:
1807: Who is this?
1808:
1809: =item *
1810:
1811: Generate Page Output
1812:
1813: =item *
1814:
1815: Choice or no choice
1816:
1817: =item *
1818:
1819: Table
1820:
1821: =item *
1822:
1823: Privileges
1824:
1825: =back
1826:
1827: =cut
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