File:
[LON-CAPA] /
loncom /
auth /
lonroles.pm
Revision
1.240.2.4:
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Sun Dec 20 04:11:27 2009 UTC (14 years, 8 months ago) by
raeburn
Branches:
GCI_3
- Customization for GCI_3.
- Eliminate duplicate code.
- Set request.role.adv before calling lonuserstate::readmap() so order
randomized when CC is viewing as a student (if randomorder set for folder).
1: # The LearningOnline Network with CAPA
2: # User Roles Screen
3: #
4: # $Id: lonroles.pm,v 1.240.2.4 2009/12/20 04:11:27 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 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: my $end_page = &Apache::loncommon::end_page();
169:
170: # Note to style police:
171: # This must only replace the spaces, nothing else, or it bombs elsewhere.
172: $url=~s/ /\%20/g;
173: $r->print(<<ENDREDIR);
174: $start_page
175: <script type="text/javascript">
176: // <![CDATA[
177: $swinfo
178: // ]]>
179: </script>
180: $navwindow
181: <p>$msg</p>
182: $end_page
183: ENDREDIR
184: return;
185: }
186:
187: sub error_page {
188: my ($r,$error,$dest)=@_;
189: &Apache::loncommon::content_type($r,'text/html');
190: &Apache::loncommon::no_cache($r);
191: $r->send_http_header;
192: return OK if $r->header_only;
193: # Breadcrumbs
194: my $brcrum = [{'href' => $dest,
195: 'text' => 'Problems during Course Initialization'},];
196: $r->print(&Apache::loncommon::start_page('Problems during Course Initialization',
197: undef,
198: {'bread_crumbs' => $brcrum,})
199: );
200: $r->print(
201: '<script type="text/javascript">'.
202: '// <![CDATA['.
203: &Apache::lonmenu::rawconfig().
204: '// ]]>'.
205: '</script>'.
206: '<p class="LC_error">'.&mt('The following problems occurred:').
207: '<br />'.
208: $error.
209: '</p><br /><a href="'.$dest.'">'.&mt('Continue').'</a>'
210: );
211: $r->print(&Apache::loncommon::end_page());
212: }
213:
214: sub handler {
215:
216: my $r = shift;
217:
218: my $now=time;
219: my $then=$env{'user.login.time'};
220: my $refresh=$env{'user.refresh.time'};
221: if (!$refresh) {
222: $refresh = $then;
223: }
224: my $envkey;
225: my %dcroles = ();
226: my $numdc = &check_fordc(\%dcroles,$then);
227: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
228: my $custommenu = &Apache::loncommon::needs_gci_custom();
229:
230: # ================================================================== Roles Init
231: if ($env{'form.selectrole'}) {
232:
233: my $locknum=&Apache::lonnet::get_locks();
234: if ($locknum) { return 409; }
235:
236: if ($env{'form.newrole'}) {
237: $env{'form.'.$env{'form.newrole'}}=1;
238: }
239: if ($env{'request.course.id'}) {
240: # Check if user is CC trying to select a course role
241: if ($env{'form.switchrole'}) {
242: if (!defined($env{'user.role.'.$env{'form.switchrole'}})) {
243: &adhoc_course_role($refresh,$then);
244: }
245: }
246: my %temp=('logout_'.$env{'request.course.id'} => time);
247: &Apache::lonnet::put('email_status',\%temp);
248: &Apache::lonnet::delenv('user.state.'.$env{'request.course.id'});
249: }
250: &Apache::lonnet::appenv({"request.course.id" => '',
251: "request.course.fn" => '',
252: "request.course.uri" => '',
253: "request.course.sec" => '',
254: "request.role" => 'cm',
255: "request.role.adv" => $env{'user.adv'},
256: "request.role.domain" => $env{'user.domain'}});
257: # Check if user is a DC trying to enter a course or author space and needs privs to be created
258: if ($numdc > 0) {
259: foreach my $envkey (keys %env) {
260: # Is this an ad-hoc Coordinator role?
261: if (my ($ccrole,$domain,$coursenum) =
262: ($envkey =~ m-^form\.(cc|co)\./($match_domain)/($match_courseid)$-)) {
263: if ($dcroles{$domain}) {
264: &Apache::lonnet::check_adhoc_privs($domain,$coursenum,
265: $then,$refresh,$now,$ccrole);
266: }
267: last;
268: }
269: # Is this an ad-hoc CA-role?
270: if (my ($domain,$user) =
271: ($envkey =~ m-^form\.ca\./($match_domain)/($match_username)$-)) {
272: if (($domain eq $env{'user.domain'}) && ($user eq $env{'user.name'})) {
273: delete($env{$envkey});
274: $env{'form.au./'.$domain.'/'} = 1;
275: my ($server_status,$home) = &check_author_homeserver($user,$domain);
276: if ($server_status eq 'switchserver') {
277: my $trolecode = 'au./'.$domain.'/';
278: my $switchserver = '/adm/switchserver?otherserver='.$home.'&role='.$trolecode;
279: $r->internal_redirect($switchserver);
280: }
281: last;
282: }
283: if (my ($castart,$caend) = ($env{'user.role.ca./'.$domain.'/'.$user} =~ /^(\d*)\.(\d*)$/)) {
284: if (((($castart) && ($castart < $now)) || !$castart) &&
285: ((!$caend) || (($caend) && ($caend > $now)))) {
286: my ($server_status,$home) = &check_author_homeserver($user,$domain);
287: if ($server_status eq 'switchserver') {
288: my $trolecode = 'ca./'.$domain.'/'.$user;
289: my $switchserver = '/adm/switchserver?otherserver='.$home.'&role='.$trolecode;
290: $r->internal_redirect($switchserver);
291: }
292: last;
293: }
294: }
295: # Check if author blocked ca-access
296: my %blocked=&Apache::lonnet::get('environment',['domcoord.author'],$domain,$user);
297: if ($blocked{'domcoord.author'} eq 'blocked') {
298: delete($env{$envkey});
299: $env{'user.error.msg'}=':::1:User '.$user.' in domain '.$domain.' blocked domain coordinator access';
300: last;
301: }
302: if ($dcroles{$domain}) {
303: my ($server_status,$home) = &check_author_homeserver($user,$domain);
304: if (($server_status eq 'ok') || ($server_status eq 'switchserver')) {
305: &Apache::lonnet::check_adhoc_privs($domain,$user,$then,
306: $refresh,$now,'ca');
307: if ($server_status eq 'switchserver') {
308: my $trolecode = 'ca./'.$domain.'/'.$user;
309: my $switchserver = '/adm/switchserver?'
310: .'otherserver='.$home.'&role='.$trolecode;
311: $r->internal_redirect($switchserver);
312: }
313: } else {
314: delete($env{$envkey});
315: }
316: } else {
317: delete($env{$envkey});
318: }
319: last;
320: }
321: }
322: }
323: if (($env{'form.cm'}) && ($env{'form.orgurl'})) {
324: $r->internal_redirect($env{'form.orgurl'});
325: }
326: foreach $envkey (keys %env) {
327: next if ($envkey!~/^user\.role\./);
328: my ($where,$trolecode,$role,$tstatus,$tend,$tstart);
329: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
330: \$trolecode,\$tstatus,\$tstart,\$tend);
331: if ($env{'form.'.$trolecode}) {
332: if ($tstatus eq 'is') {
333: $where=~s/^\///;
334: my ($cdom,$cnum,$csec)=split(/\//,$where);
335: # check for course groups
336: my %coursegroups = &Apache::lonnet::get_active_groups(
337: $env{'user.domain'},$env{'user.name'},$cdom, $cnum);
338: my $cgrps = join(':',keys(%coursegroups));
339:
340: # store role if recent_role list being kept
341: if ($env{'environment.recentroles'}) {
342: my %frozen_roles =
343: &Apache::lonhtmlcommon::get_recent_frozen('roles',$env{'environment.recentrolesn'});
344: &Apache::lonhtmlcommon::store_recent('roles',
345: $trolecode,' ',$frozen_roles{$trolecode});
346: }
347:
348:
349: # check for keyed access
350: if (($role eq 'st') &&
351: ($env{'course.'.$cdom.'_'.$cnum.'.keyaccess'} eq 'yes')) {
352: # who is key authority?
353: my $authdom=$cdom;
354: my $authnum=$cnum;
355: if ($env{'course.'.$cdom.'_'.$cnum.'.keyauth'}) {
356: ($authnum,$authdom)=
357: split(/:/,$env{'course.'.$cdom.'_'.$cnum.'.keyauth'});
358: }
359: # check with key authority
360: unless (&Apache::lonnet::validate_access_key(
361: $env{'environment.key.'.$cdom.'_'.$cnum},
362: $authdom,$authnum)) {
363: # there is no valid key
364: if ($env{'form.newkey'}) {
365: # student attempts to register a new key
366: &Apache::loncommon::content_type($r,'text/html');
367: &Apache::loncommon::no_cache($r);
368: $r->send_http_header;
369: my $swinfo=&Apache::lonmenu::rawconfig();
370: my $start_page=&Apache::loncommon::start_page
371: ('Verifying Access Key to Unlock this Course');
372: my $end_page=&Apache::loncommon::end_page();
373: my $buttontext=&mt('Enter Course');
374: my $message=&mt('Successfully registered key');
375: my $assignresult=
376: &Apache::lonnet::assign_access_key(
377: $env{'form.newkey'},
378: $authdom,$authnum,
379: $cdom,$cnum,
380: $env{'user.domain'},
381: $env{'user.name'},
382: &mt('Assigned from [_1] at [_2] for [_3]'
383: ,$ENV{'REMOTE_ADDR'}
384: ,&Apache::lonlocal::locallocaltime()
385: ,$trolecode)
386: );
387: unless ($assignresult eq 'ok') {
388: $assignresult=~s/^error\:\s*//;
389: $message=&mt($assignresult).
390: '<br /><a href="/adm/logout">'.
391: &mt('Logout').'</a>';
392: $buttontext=&mt('Re-Enter Key');
393: }
394: $r->print(<<ENDENTEREDKEY);
395: $start_page
396: <script type="text/javascript">
397: // <![CDATA[
398: $swinfo
399: // ]]>
400: </script>
401: <form action="" method="post">
402: <input type="hidden" name="selectrole" value="1" />
403: <input type="hidden" name="$trolecode" value="1" />
404: <span class="LC_fontsize_large">$message</span><br />
405: <input type="submit" value="$buttontext" />
406: </form>
407: $end_page
408: ENDENTEREDKEY
409: return OK;
410: } else {
411: # print form to enter a new key
412: &Apache::loncommon::content_type($r,'text/html');
413: &Apache::loncommon::no_cache($r);
414: $r->send_http_header;
415: my $swinfo=&Apache::lonmenu::rawconfig();
416: my $start_page=&Apache::loncommon::start_page
417: ('Enter Access Key to Unlock this Course');
418: my $end_page=&Apache::loncommon::end_page();
419: $r->print(<<ENDENTERKEY);
420: $start_page
421: <script type="text/javascript">
422: // <![CDATA[
423: $swinfo
424: // ]]>
425: </script>
426: <form action="" method="post">
427: <input type="hidden" name="selectrole" value="1" />
428: <input type="hidden" name="$trolecode" value="1" />
429: <input type="text" size="20" name="newkey" value="$env{'form.newkey'}" />
430: <input type="submit" value="Enter key" />
431: </form>
432: $end_page
433: ENDENTERKEY
434: return OK;
435: }
436: }
437: }
438: &Apache::lonnet::log($env{'user.domain'},
439: $env{'user.name'},
440: $env{'user.home'},
441: "Role ".$trolecode);
442:
443: &Apache::lonnet::appenv(
444: {'request.role' => $trolecode,
445: 'request.role.domain' => $cdom,
446: 'request.course.sec' => $csec,
447: 'request.course.groups' => $cgrps});
448: my $tadv=0;
449:
450: if (($cnum) && ($role ne 'ca') && ($role ne 'aa')) {
451: my $msg;
452: if (&Apache::lonnet::allowed('adv') eq 'F') { $tadv=1; }
453: &Apache::lonnet::appenv({'request.role.adv'=>$tadv});
454: my ($furl,$ferr)=
455: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
456: if (($env{'form.orgurl'}) &&
457: ($env{'form.orgurl'}!~/^\/adm\/flip/)) {
458: my $dest=$env{'form.orgurl'};
459: if ($env{'form.symb'}) {
460: if ($dest =~ /\?/) {
461: $dest .= '&';
462: } else {
463: $dest .= '?'
464: }
465: $dest .= 'symb='.$env{'form.symb'};
466: }
467: if (($ferr) && ($tadv)) {
468: &error_page($r,$ferr,$dest);
469: } else {
470: $r->internal_redirect($dest);
471: }
472: return OK;
473: } else {
474: if (!$env{'request.course.id'}) {
475: &Apache::lonnet::appenv(
476: {"request.course.id" => $cdom.'_'.$cnum});
477: $furl='/adm/roles?tryagain=1';
478: $msg='<p><span class="LC_error">'
479: .&mt('Could not initialize [_1] at this time.',
480: $env{'course.'.$cdom.'_'.$cnum.'.description'})
481: .'</span></p>'
482: .'<p>'.&mt('Please try again.').'</p>'
483: .'<p>'.$ferr.'</p>';
484: }
485:
486: if (($ferr) && ($tadv)) {
487: &error_page($r,$ferr,$furl);
488: } else {
489: # Check to see if the user is a CC entering a course
490: # for the first time
491: my (undef, undef, $role, $courseid) = split(/\./, $envkey);
492: if (substr($courseid, 0, 1) eq '/') {
493: $courseid = substr($courseid, 1);
494: }
495: $courseid =~ s/\//_/;
496: if (($cdom ne 'gcitest') && (($role eq 'cc') || ($role eq 'co'))
497: && ($env{'course.' . $courseid .'.course.helper.not.run'})) {
498: $furl = "/adm/helper/course.initialization.helper";
499: # Send the user to the course they selected
500: } elsif ($env{'request.course.id'}) {
501: if ($env{'form.destinationurl'}) {
502: my $dest = $env{'form.destinationurl'};
503: if ($env{'form.destsymb'} ne '') {
504: my $esc_symb = &HTML::Entities::encode($env{'form.destsymb'},'"<>&');
505: $dest .= '?symb='.$esc_symb;
506: }
507: &redirect_user($r,&mt('Entering [_1]',
508: $env{'course.'.$courseid.'.description'}),
509: $dest,$msg,
510: $env{'environment.remotenavmap'});
511: return OK;
512: }
513: if (&Apache::lonnet::allowed('whn',
514: $env{'request.course.id'})
515: || &Apache::lonnet::allowed('whn',
516: $env{'request.course.id'}.'/'
517: .$env{'request.course.sec'})
518: ) {
519: my $startpage = &courseloadpage($courseid);
520: unless (($startpage eq 'firstres') || ($cdom eq 'gcitest')) {
521: $msg = &mt('Entering [_1] ...',
522: $env{'course.'.$courseid.'.description'});
523: &redirect_user($r,&mt('New in course'),
524: '/adm/whatsnew?refpage=start',$msg,
525: $env{'environment.remotenavmap'});
526: return OK;
527: }
528: }
529: }
530: # Are we allowed to look at the first resource?
531: if ($furl !~ m|^/adm/|) {
532: # Guess not ...
533: $furl=&Apache::lonpageflip::first_accessible_resource();
534: }
535: if (($cdom eq 'gcitest') && ($custommenu)) {
536: $furl = '/adm/navmaps';
537: }
538: $msg = &mt('Entering [_1] ...',
539: $env{'course.'.$courseid.'.description'});
540: &redirect_user($r,&mt('Entering [_1]',
541: $env{'course.'.$courseid.'.description'}),
542: $furl,$msg,
543: $env{'environment.remotenavmap'});
544: }
545: return OK;
546: }
547: }
548: #
549: # Send the user to the construction space they selected
550: if ($role =~ /^(au|ca|aa)$/) {
551: my $redirect_url = '/priv/';
552: if ($role eq 'au') {
553: $redirect_url.=$env{'user.name'};
554: } else {
555: $where =~ /\/(.*)$/;
556: $redirect_url .= $1;
557: }
558: $redirect_url .= '/';
559: &redirect_user($r,&mt('Entering Construction Space'),
560: $redirect_url);
561: return OK;
562: }
563: if ($role eq 'dc') {
564: my $redirect_url = '/adm/menu/';
565: &redirect_user($r,&mt('Loading Domain Coordinator Menu'),
566: $redirect_url);
567: return OK;
568: }
569: if ($role eq 'sc') {
570: my $redirect_url = '/adm/grades?command=scantronupload';
571: &redirect_user($r,&mt('Loading Data Upload Page'),
572: $redirect_url);
573: return OK;
574: }
575: }
576: }
577: }
578: }
579:
580: # =============================================================== No Roles Init
581:
582: &Apache::loncommon::content_type($r,'text/html');
583: &Apache::loncommon::no_cache($r);
584: $r->send_http_header;
585: return OK if $r->header_only;
586:
587: my ($crumbtext,$pagetitle,$recent,$show_course);
588: my $noscript='<span class="LC_error">'.&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.').'<br />'.&mt('As this is not the case, most functionality in the system will be unavailable.').'</span><br />';
589: if ($custommenu) {
590: my $start_page = &Apache::loncommon::start_page('Main Menu',undef,
591: {'bread_crumbs' => 1});
592: $r->print(<<"ENDCUSTOM");
593: $start_page
594: <br />
595: <noscript>
596: $noscript
597: </noscript>
598: ENDCUSTOM
599: } else {
600: $crumbtext = 'User Roles';
601: $pagetitle = 'My Roles';
602: $recent = &mt('Recent Roles');
603: $show_course=&Apache::loncommon::show_course();
604: if ($show_course) {
605: $crumbtext = 'Courses';
606: $pagetitle = 'My Courses';
607: $recent = &mt('Recent Courses');
608: }
609: my $brcrum =[{href=>"/adm/roles",text=>$crumbtext}];
610: my $swinfo=&Apache::lonmenu::rawconfig();
611: my $start_page=&Apache::loncommon::start_page($pagetitle,undef,{bread_crumbs=>$brcrum});
612: my $standby=&mt('Role selected. Please stand by.');
613: $standby=~s/\n/\\n/g;
614: $r->print(<<ENDHEADER);
615: $start_page
616: <br />
617: <noscript>
618: $noscript
619: </noscript>
620: <script type="text/javascript">
621: // <![CDATA[
622: $swinfo
623: window.focus();
624:
625: active=true;
626:
627: function enterrole (thisform,rolecode,buttonname) {
628: if (active) {
629: active=false;
630: document.title='$standby';
631: window.status='$standby';
632: thisform.newrole.value=rolecode;
633: thisform.submit();
634: } else {
635: alert('$standby');
636: }
637: }
638: // ]]>
639: </script>
640: ENDHEADER
641: }
642:
643: # ------------------------------------------ Get Error Message from Environment
644:
645: my ($fn,$priv,$nochoose,$error,$msg)=split(/:/,$env{'user.error.msg'});
646: if ($env{'user.error.msg'}) {
647: $r->log_reason(
648: "$msg for $env{'user.name'} domain $env{'user.domain'} access $priv",$fn);
649: }
650:
651: # ------------------------------------------------- Can this user re-init, etc?
652:
653: my $advanced=$env{'user.adv'};
654: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['tryagain']);
655: my $tryagain=$env{'form.tryagain'};
656: my $reinit=$env{'user.reinit'};
657: delete $env{'user.reinit'};
658:
659: # -------------------------------------------------------- Generate Page Output
660: # --------------------------------------------------------------- Error Header?
661: if ($error) {
662: $r->print("<h1>".&mt('LON-CAPA Access Control')."</h1>");
663: $r->print("<!-- LONCAPAACCESSCONTROLERRORSCREEN --><hr /><pre>");
664: if ($priv ne '') {
665: $r->print(&mt('Access : ').&Apache::lonnet::plaintext($priv)."\n");
666: }
667: if ($fn ne '') {
668: $r->print(&mt('Resource: ').&Apache::lonenc::check_encrypt($fn)."\n");
669: }
670: if ($msg ne '') {
671: $r->print(&mt('Action : ').$msg."\n");
672: }
673: $r->print("</pre><hr />");
674: my $url=$fn;
675: my $last;
676: if (tie(my %hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
677: &GDBM_READER(),0640)) {
678: $last=$hash{'last_known'};
679: untie(%hash);
680: }
681: if ($last) { $fn.='?symb='.&escape($last); }
682:
683: &Apache::londocs::changewarning($r,undef,'You have modified your course recently, [_1] may fix this access problem.',
684: &Apache::lonenc::check_encrypt($fn));
685: } else {
686: if ($env{'user.error.msg'}) {
687: if ($reinit) {
688: $r->print(
689: '<h3><span class="LC_error">'.
690: &mt('As your session file for the course or community has expired, you will need to re-select it.').'</span></h3>');
691: } else {
692: $r->print(
693: '<h3><span class="LC_error">'.
694: &mt('You need to choose another user role or enter a specific course or community for this function.').
695: '</span></h3>');
696: }
697: }
698: }
699: # -------------------------------------------------------- Choice or no choice?
700: if ($nochoose) {
701: $r->print("<h2>".&mt('Sorry ...')."</h2>\n<span class='LC_error'>".
702: &mt('This action is currently not authorized.').'</span>'.
703: &Apache::loncommon::end_page());
704: return OK;
705: } else {
706: if (($ENV{'REDIRECT_QUERY_STRING'}) && ($fn)) {
707: $fn.='?'.$ENV{'REDIRECT_QUERY_STRING'};
708: }
709: unless ($custommenu) {
710: $r->print('<form method="post" name="rolechoice" action="'.(($fn)?$fn:$r->uri).'">');
711: $r->print('<input type="hidden" name="orgurl" value="'.$fn.'" />');
712: $r->print('<input type="hidden" name="selectrole" value="1" />');
713: $r->print('<input type="hidden" name="newrole" value="" />');
714: }
715: }
716:
717: my (%roletext,%sortrole,%roleclass,%futureroles,%timezones);
718: my ($countactive,$countfuture,$inrole,$possiblerole) =
719: &gather_roles($then,$refresh,$now,$reinit,$nochoose,\%roletext,\%sortrole,\%roleclass,
720: \%futureroles,\%timezones);
721:
722: $refresh = $now;
723: &Apache::lonnet::appenv({'user.refresh.time' => $refresh});
724: if ($custommenu) {
725: my %courses = &Apache::loncommon::existing_gcitest_courses();
726: $env{'browser.interface'}='faketextual';
727: $env{'environment.remote'}='off';
728: my $numcourses = keys(%courses);
729: my $switcher;
730: if ($numcourses > 0) {
731: $switcher = &Apache::lonmainmenu::gcitest_switcher(%courses);
732: my $current;
733: if ($env{'request.course.id'}) {
734: $current = 'cc./'.$env{'course.'.$env{'request.course.id'}.'.domain'}.
735: '/'.$env{'course.'.$env{'request.course.id'}.'.num'};
736: }
737: my $switcher_js = &Apache::lonmainmenu::gcitest_switcher_js($current,$numcourses);
738: $r->print(<<"ENDSCRIPT");
739: <script type="text/javascript">
740: // <![CDATA[
741: $switcher_js
742: // ]]>
743: </script>
744: ENDSCRIPT
745: }
746: $r->print(&Apache::lonmenu::inlinemenu('gcicustom',$switcher).
747: &Apache::loncommon::end_page());
748: return OK;
749: }
750: if ($env{'user.adv'}) {
751: $r->print('<p><label><input type="checkbox" name="showall"');
752: if ($env{'form.showall'}) { $r->print(' checked="checked" '); }
753: $r->print(' />'.&mt('Show all roles').'</label>'
754: .' <input type="submit" value="'.&mt('Update display').'" />'
755: .'</p>');
756: } else {
757: if ($countactive > 0) {
758: &queued_selfenrollment($r);
759: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
760: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
761: $r->print(
762: '<p>'
763: .&mt('[_1]Visit the [_2]Course/Community Catalog[_3]'
764: .' to view all [_4] LON-CAPA courses and communities.'
765: ,'<b>'
766: ,'<a href="/adm/coursecatalog?showdom='.$esc_dom.'">'
767: ,'</a></b>',$domdesc)
768: .'<br />'
769: .&mt('If a course or community is [_1]not[_2] in your list of current courses and communities below,'
770: .' you may be able to enroll if self-enrollment is permitted.'
771: ,'<b>','</b>')
772: .'</p>'
773: );
774: }
775: }
776:
777: # No active roles
778: if ($countactive==0) {
779: if ($inrole) {
780: $r->print('<h2>'.&mt('Currently no additional roles, courses or communities').'</h2>');
781: } else {
782: $r->print('<h2>'.&mt('Currently no active roles, courses or communities').'</h2>');
783: }
784: &findcourse_advice($r);
785: &requestcourse_advice($r);
786: $r->print('</form>');
787: if ($countfuture) {
788: $r->print(&mt('The following [quant,_1,role,roles] will become active in the future:',$countfuture));
789: my $doheaders = &roletable_headers($r,\%roleclass,\%sortrole,
790: $nochoose);
791: &print_rolerows($r,$doheaders,\%roleclass,\%sortrole,\%dcroles,
792: \%roletext);
793: my $tremark='';
794: my $tbg;
795: if ($env{'request.role'} eq 'cm') {
796: $tbg="LC_roles_selected";
797: $tremark=&mt('Currently selected.').' ';
798: } else {
799: $tbg="LC_roles_is";
800: }
801: $r->print(&Apache::loncommon::start_data_table_row()
802: .'<td class="'.$tbg.'"> </td>'
803: .'<td colspan="3">'
804: .&mt('No role specified')
805: .'</td>'
806: .'<td>'.$tremark.' </td>'
807: .&Apache::loncommon::end_data_table_row()
808: );
809:
810: $r->print(&Apache::loncommon::end_data_table());
811: }
812: $r->print(&Apache::loncommon::end_page());
813: return OK;
814: } elsif ($countactive==1) { # Is there only one choice?
815: my $needs_switchserver;
816: if ($env{'user.author'}) {
817: $needs_switchserver = &check_needs_switchserver($possiblerole);
818: }
819: if ((!$needs_switchserver) && ($env{'request.role'} eq 'cm')) {
820: $r->print('<h3>'.&mt('Please stand by.').'</h3>'.
821: '<input type="hidden" name="'.$possiblerole.'" value="1" />'.
822: '<noscript><br /><input type="submit" name="submit" value="'.&mt('Continue').'" /></noscript>');
823: $r->print("</form>\n");
824: $r->rflush();
825: $r->print('<script type="text/javascript">document.forms.rolechoice.submit();</script>');
826: $r->print(&Apache::loncommon::end_page());
827: return OK;
828: }
829: if ($needs_switchserver) {
830: $r->print("<h2>".&mt('Server Switch Required')."</h2>\n".
831: &mt('Construction Space access is only available from '.
832: 'the home server of the corresponding Author.').'<br />'.
833: &mt("Click the 'Switch Server' link to go there.").'<br />');
834: }
835: }
836: # ----------------------------------------------------------------------- Table
837: unless ((!&Apache::loncommon::show_course()) || ($nochoose) || ($countactive==1)) {
838: $r->print("<h2>".&mt('Select a Course to Enter')."</h2>\n");
839: }
840: if ($env{'form.destinationurl'}) {
841: $r->print('<input type="hidden" name="destinationurl" value="'.
842: $env{'form.destinationurl'}.'" />');
843: if ($env{'form.destsymb'} ne '') {
844: $r->print('<input type="hidden" name="destsymb" value="'.
845: $env{'form.destsymb'}.'" />');
846: }
847: }
848: my $doheaders = &roletable_headers($r,\%roleclass,\%sortrole,$nochoose);
849: if ($env{'environment.recentroles'}) {
850: my %recent_roles =
851: &Apache::lonhtmlcommon::get_recent('roles',$env{'environment.recentrolesn'});
852: my $output='';
853: foreach (sort(keys(%recent_roles))) {
854: if (ref($roletext{'user.role.'.$_}) eq 'ARRAY') {
855: $output.= &Apache::loncommon::start_data_table_row().
856: $roletext{'user.role.'.$_}->[0].
857: &Apache::loncommon::end_data_table_row().
858: &Apache::loncommon::continue_data_table_row().
859: $roletext{'user.role.'.$_}->[1].
860: &Apache::loncommon::end_data_table_row();
861: if ($_ =~ m-dc\./($match_domain)/-
862: && $dcroles{$1}) {
863: $output .= &adhoc_roles_row($1,'recent');
864: }
865: } elsif ($numdc > 0) {
866: unless ($_ =~/^error\:/) {
867: $output.=&display_cc_role('user.role.'.$_);
868: }
869: }
870: }
871: if ($output) {
872: $r->print(&Apache::loncommon::start_data_table_empty_row()
873: .'<td align="center" colspan="5">'
874: .$recent
875: .'</td>'
876: .&Apache::loncommon::end_data_table_empty_row()
877: );
878: $r->print($output);
879: $doheaders ++;
880: }
881: }
882:
883: if ($numdc > 0) {
884: $r->print(&coursepick_jscript());
885: $r->print(&Apache::loncommon::coursebrowser_javascript().
886: &Apache::loncommon::authorbrowser_javascript());
887: }
888: &print_rolerows($r,$doheaders,\%roleclass,\%sortrole,\%dcroles,\%roletext);
889: if ($countactive > 1) {
890: my $tremark='';
891: my $tbg;
892: if ($env{'request.role'} eq 'cm') {
893: $tbg="LC_roles_selected";
894: $tremark=&mt('Currently selected.').' ';
895: } else {
896: $tbg="LC_roles_is";
897: }
898: $r->print(&Apache::loncommon::start_data_table_row());
899: unless ($nochoose) {
900: if ($env{'request.role'} ne 'cm') {
901: $r->print('<td class="'.$tbg.'"><input type="submit" value="'.
902: &mt('Select').'" name="cm" /></td>');
903: } else {
904: $r->print('<td class="'.$tbg.'"> </td>');
905: }
906: }
907: $r->print('<td colspan="3">'
908: .&mt('No role specified')
909: .'</td>'
910: .'<td>'.$tremark.' </td>'
911: .&Apache::loncommon::end_data_table_row()
912: );
913: }
914: $r->print(&Apache::loncommon::end_data_table());
915: unless ($nochoose) {
916: $r->print("</form>\n");
917: }
918: # ------------------------------------------------------------ Privileges Info
919: if (($advanced) && (($env{'user.error.msg'}) || ($error))) {
920: $r->print('<hr /><h2>'.&mt('Current Privileges').'</h2>');
921: $r->print(&privileges_info());
922: }
923: $r->print(&Apache::lonnet::getannounce());
924: if ($advanced) {
925: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
926: $r->print('<p><small><i>'
927: .&mt('This LON-CAPA server is version [_1]',$r->dir_config('lonVersion'))
928: .'</i><br />'
929: .'<a href="/adm/logout">'.&mt('Logout').'</a> '
930: .'<a href="/adm/coursecatalog?showdom='.$esc_dom.'">'
931: .&mt('Course/Community Catalog')
932: .'</a></small></p>');
933: }
934: $r->print(&Apache::loncommon::end_page());
935: return OK;
936: }
937:
938: sub gather_roles {
939: my ($then,$refresh,$now,$reinit,$nochoose,$roletext,$sortrole,$roleclass,$futureroles,$timezones) = @_;
940: my ($countactive,$countfuture,$inrole,$possiblerole) = (0,0,0,'');
941: my $advanced = $env{'user.adv'};
942: my $tryagain = $env{'form.tryagain'};
943: foreach my $envkey (sort(keys(%env))) {
944: my $button = 1;
945: my $switchserver='';
946: my ($role_text,$role_text_end,$sortkey);
947: if ($envkey=~/^user\.role\./) {
948: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus,$tpstart,$tpend);
949: &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
950: \$trolecode,\$tstatus,\$tstart,\$tend);
951: next if (!defined($role) || $role eq '' || $role =~ /^gr/);
952: my $timezone = &role_timezone($where,$timezones);
953: $tremark='';
954: $tpstart=' ';
955: $tpend=' ';
956: if ($tstart) {
957: $tpstart=&Apache::lonlocal::locallocaltime($tstart,$timezone);
958: }
959: if ($tend) {
960: $tpend=&Apache::lonlocal::locallocaltime($tend,$timezone);
961: }
962: if ($env{'request.role'} eq $trolecode) {
963: $tstatus='selected';
964: }
965: my $tbg;
966: if (($tstatus eq 'is')
967: || ($tstatus eq 'selected')
968: || ($tstatus eq 'future')
969: || ($env{'form.showall'})) {
970: if ($tstatus eq 'is') {
971: $tbg='LC_roles_is';
972: $possiblerole=$trolecode;
973: $countactive++;
974: } elsif ($tstatus eq 'future') {
975: $tbg='LC_roles_future';
976: $button=0;
977: $futureroles->{$trolecode} = $tstart.':'.$tend;
978: $countfuture ++;
979: } elsif ($tstatus eq 'expired') {
980: $tbg='LC_roles_expired';
981: $button=0;
982: } elsif ($tstatus eq 'will_not') {
983: $tbg='LC_roles_will_not';
984: $tremark.=&mt('Expired after logout.').' ';
985: } elsif ($tstatus eq 'selected') {
986: $tbg='LC_roles_selected';
987: $inrole=1;
988: $countactive++;
989: $tremark.=&mt('Currently selected.').' ';
990: }
991: my $trole;
992: if ($role =~ /^cr\//) {
993: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$role);
994: if ($tremark) { $tremark.='<br />'; }
995: $tremark.=&mt('Defined by [_1] at [_2].',$rauthor,$rdomain);
996: }
997: $trole=Apache::lonnet::plaintext($role);
998: my $ttype;
999: my $twhere;
1000: my ($tdom,$trest,$tsection)=
1001: split(/\//,Apache::lonnet::declutter($where));
1002: # First, Co-Authorship roles
1003: if (($role eq 'ca') || ($role eq 'aa')) {
1004: my $home = &Apache::lonnet::homeserver($trest,$tdom);
1005: my $allowed=0;
1006: my @ids=&Apache::lonnet::current_machine_ids();
1007: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
1008: if (!$allowed) {
1009: $button=0;
1010: $switchserver='otherserver='.$home.'&role='.$trolecode;
1011: }
1012: #next if ($home eq 'no_host');
1013: $home = &Apache::lonnet::hostname($home);
1014: $ttype='Construction Space';
1015: $twhere=&mt('User').': '.$trest.'<br />'.&mt('Domain').
1016: ': '.$tdom.'<br />'.
1017: ' '.&mt('Server').': '.$home;
1018: $env{'course.'.$tdom.'_'.$trest.'.description'}='ca';
1019: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$trest.'/');
1020: $sortkey=$role."$trest:$tdom";
1021: } elsif ($role eq 'au') {
1022: # Authors
1023: my $home = &Apache::lonnet::homeserver
1024: ($env{'user.name'},$env{'user.domain'});
1025: my $allowed=0;
1026: my @ids=&Apache::lonnet::current_machine_ids();
1027: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
1028: if (!$allowed) {
1029: $button=0;
1030: $switchserver='otherserver='.$home.'&role='.$trolecode;
1031: }
1032: #next if ($home eq 'no_host');
1033: $home = &Apache::lonnet::hostname($home);
1034: $ttype='Construction Space';
1035: $twhere=&mt('Domain').': '.$tdom.'<br />'.&mt('Server').
1036: ': '.$home;
1037: $env{'course.'.$tdom.'_'.$trest.'.description'}='ca';
1038: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$env{'user.name'}.'/');
1039: $sortkey=$role;
1040: } elsif ($trest) {
1041: my $tcourseid=$tdom.'_'.$trest;
1042: $ttype = &Apache::loncommon::course_type($tcourseid);
1043: $trole = &Apache::lonnet::plaintext($role,$ttype);
1044: if ($env{'course.'.$tcourseid.'.description'}) {
1045: $twhere=$env{'course.'.$tcourseid.'.description'};
1046: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
1047: unless ($twhere eq &mt('Currently not available')) {
1048: $twhere.=' <span class="LC_fontsize_small">'.
1049: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
1050: '</span>';
1051: }
1052: } else {
1053: my %newhash=&Apache::lonnet::coursedescription($tcourseid);
1054: if (%newhash) {
1055: $sortkey=$role."\0".$tdom."\0".$newhash{'description'}.
1056: "\0".$envkey;
1057: $twhere=$newhash{'description'}.
1058: ' <span class="LC_fontsize_small">'.
1059: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom).
1060: '</span>';
1061: $ttype = $newhash{'type'};
1062: $trole = &Apache::lonnet::plaintext($role,$ttype);
1063: } else {
1064: $twhere=&mt('Currently not available');
1065: $env{'course.'.$tcourseid.'.description'}=$twhere;
1066: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
1067: $ttype = 'Unavailable';
1068: }
1069: }
1070: if ($tsection) {
1071: $twhere.='<br />'.&mt('Section').': '.$tsection;
1072: }
1073: if ($role ne 'st') { $twhere.="<br />".&mt('Domain').":".$tdom; }
1074: } elsif ($tdom) {
1075: $ttype='Domain';
1076: $twhere=$tdom;
1077: $sortkey=$role.$twhere;
1078: } else {
1079: $ttype='System';
1080: $twhere=&mt('system wide');
1081: $sortkey=$role.$twhere;
1082: }
1083: ($role_text,$role_text_end) =
1084: &build_roletext($trolecode,$tdom,$trest,$tstatus,$tryagain,
1085: $advanced,$tremark,$tbg,$trole,$twhere,$tpstart,
1086: $tpend,$nochoose,$button,$switchserver,$reinit);
1087: $roletext->{$envkey}=[$role_text,$role_text_end];
1088: if (!$sortkey) {$sortkey=$twhere."\0".$envkey;}
1089: $sortrole->{$sortkey}=$envkey;
1090: $roleclass->{$envkey}=$ttype;
1091: }
1092: }
1093: }
1094: return ($countactive,$countfuture,$inrole,$possiblerole);
1095: }
1096:
1097: sub role_timezone {
1098: my ($where,$timezones) = @_;
1099: my $timezone;
1100: if (ref($timezones) eq 'HASH') {
1101: if ($where =~ m{^/($match_domain)/($match_courseid)}) {
1102: my $cdom = $1;
1103: my $cnum = $2;
1104: if ($cdom && $cnum) {
1105: if (!exists($timezones->{$cdom.'_'.$cnum})) {
1106: my %timehash =
1107: &Apache::lonnet::get('environment',['timezone'],$cdom,$cnum);
1108: if ($timehash{'timezone'} eq '') {
1109: if (!exists($timezones->{$cdom})) {
1110: my %domdefaults =
1111: &Apache::lonnet::get_domain_defaults($cdom);
1112: if ($domdefaults{'timezone_def'} eq '') {
1113: $timezones->{$cdom} = 'local';
1114: } else {
1115: $timezones->{$cdom} = $domdefaults{'timezone_def'};
1116: }
1117: }
1118: $timezones->{$cdom.'_'.$cnum} = $timezones->{$cdom};
1119: } else {
1120: $timezones->{$cdom.'_'.$cnum} =
1121: &Apache::lonlocal::gettimezone($timehash{'timezone'});
1122: }
1123: }
1124: $timezone = $timezones->{$cdom.'_'.$cnum};
1125: }
1126: } else {
1127: my ($tdom) = ($where =~ m{^/($match_domain)});
1128: if ($tdom) {
1129: if (!exists($timezones->{$tdom})) {
1130: my %domdefaults = &Apache::lonnet::get_domain_defaults($tdom);
1131: if ($domdefaults{'timezone_def'} eq '') {
1132: $timezones->{$tdom} = 'local';
1133: } else {
1134: $timezones->{$tdom} = $domdefaults{'timezone_def'};
1135: }
1136: }
1137: $timezone = $timezones->{$tdom};
1138: }
1139: }
1140: if ($timezone eq 'local') {
1141: $timezone = undef;
1142: }
1143: }
1144: return $timezone;
1145: }
1146:
1147: sub roletable_headers {
1148: my ($r,$roleclass,$sortrole,$nochoose) = @_;
1149: my $doheaders;
1150: if ((ref($sortrole) eq 'HASH') && (ref($roleclass) eq 'HASH')) {
1151: $r->print('<br />'
1152: .&Apache::loncommon::start_data_table()
1153: .&Apache::loncommon::start_data_table_header_row()
1154: );
1155: if (!$nochoose) { $r->print('<th> </th>'); }
1156: $r->print('<th>'.&mt('User Role').'</th>'
1157: .'<th>'.&mt('Extent').'</th>'
1158: .'<th>'.&mt('Start').'</th>'
1159: .'<th>'.&mt('End').'</th>'
1160: .&Apache::loncommon::end_data_table_header_row()
1161: );
1162: $doheaders=-1;
1163: my @roletypes = &roletypes();
1164: foreach my $type (@roletypes) {
1165: my $haverole=0;
1166: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%{$sortrole}))) {
1167: if ($roleclass->{$sortrole->{$which}} =~ /^\Q$type\E/) {
1168: $haverole=1;
1169: }
1170: }
1171: if ($haverole) { $doheaders++; }
1172: }
1173: }
1174: return $doheaders;
1175: }
1176:
1177: sub roletypes {
1178: my @types = ('Domain','Construction Space','Course','Community','Unavailable','System');
1179: return @types;
1180: }
1181:
1182: sub print_rolerows {
1183: my ($r,$doheaders,$roleclass,$sortrole,$dcroles,$roletext) = @_;
1184: if ((ref($roleclass) eq 'HASH') && (ref($sortrole) eq 'HASH')) {
1185: my @types = &roletypes();
1186: foreach my $type (@types) {
1187: my $output;
1188: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%{$sortrole}))) {
1189: if ($roleclass->{$sortrole->{$which}} =~ /^\Q$type\E/) {
1190: if (ref($roletext) eq 'HASH') {
1191: if (ref($roletext->{$sortrole->{$which}}) eq 'ARRAY') {
1192: $output.= &Apache::loncommon::start_data_table_row().
1193: $roletext->{$sortrole->{$which}}->[0].
1194: &Apache::loncommon::end_data_table_row().
1195: &Apache::loncommon::continue_data_table_row().
1196: $roletext->{$sortrole->{$which}}->[1].
1197: &Apache::loncommon::end_data_table_row();
1198: }
1199: if ($sortrole->{$which} =~ m-dc\./($match_domain)/-) {
1200: if (ref($dcroles) eq 'HASH') {
1201: if ($dcroles->{$1}) {
1202: $output .= &adhoc_roles_row($1,'');
1203: }
1204: }
1205: }
1206: }
1207: }
1208: }
1209: if ($output) {
1210: if ($doheaders > 0) {
1211: $r->print(&Apache::loncommon::start_data_table_empty_row()
1212: .'<td align="center" colspan="5">'
1213: .&mt($type)
1214: .'</td>'
1215: .&Apache::loncommon::end_data_table_empty_row()
1216: );
1217: }
1218: $r->print($output);
1219: }
1220: }
1221: }
1222: }
1223:
1224: sub findcourse_advice {
1225: my ($r) = @_;
1226: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
1227: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
1228: if (&Apache::lonnet::auto_run(undef,$env{'user.domain'})) {
1229: $r->print(&mt('If you were expecting to see an active role listed for a particular course in the [_1] domain, it may be missing for one of the following reasons:',$domdesc).'
1230: <ul>
1231: <li>'.&mt('The course has yet to be created.').'</li>
1232: <li>'.&mt('Automatic enrollment of registered students has not been enabled for the course.').'</li>
1233: <li>'.&mt('You are in a section of course for which automatic enrollment in the corresponding LON-CAPA course is not active.').'</li>
1234: <li>'.&mt('The start date for automated enrollment has yet to be reached.').'</li>
1235: <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>
1236: </ul>');
1237: } else {
1238: $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 />');
1239: }
1240: $r->print('<h3>'.&mt('Self-Enrollment').'</h3>'.
1241: '<p>'.&mt('The [_1]Course/Community Catalog[_2] provides information about all [_3] classes for which LON-CAPA courses have been created, as well as any communities in the domain.','<a href="/adm/coursecatalog?showdom='.$esc_dom.'">','</a>',$domdesc).'<br />');
1242: $r->print(&mt('You can search for courses and communities which permit self-enrollment, if you would like to enroll in one.').'</p>');
1243: &queued_selfenrollment($r);
1244: return;
1245: }
1246:
1247: sub requestcourse_advice {
1248: my ($r) = @_;
1249: my $domdesc = &Apache::lonnet::domain($env{'user.domain'},'description');
1250: my $esc_dom = &HTML::Entities::encode($env{'user.domain'},'"<>&');
1251: my (%can_request,%request_doms);
1252: &Apache::lonnet::check_can_request($env{'user.domain'},\%can_request,\%request_doms);
1253: if (keys(%request_doms) > 0) {
1254: my ($types,$typename) = &Apache::loncommon::course_types();
1255: if ((ref($types) eq 'ARRAY') && (ref($typename) eq 'HASH')) {
1256: $r->print('<h3>'.&mt('Request creation of a course or community').'</h3>'.
1257: '<p>'.&mt('You have rights to request the creation of courses and/or communities in the following domain(s):').'<ul>');
1258: my (@reqdoms,@reqtypes);
1259: foreach my $type (sort(keys(%request_doms))) {
1260: push(@reqtypes,$type);
1261: if (ref($request_doms{$type}) eq 'ARRAY') {
1262: my $domstr = join(', ',map { &Apache::lonnet::domain($_) } sort(@{$request_doms{$type}}));
1263: $r->print(
1264: '<li>'
1265: .&mt('[_1]'.$typename->{$type}.'[_2] in domain: [_3]',
1266: '<i>',
1267: '</i>',
1268: '<b>'.$domstr.'</b>')
1269: .'</li>'
1270: );
1271: foreach my $dom (@{$request_doms{$type}}) {
1272: unless (grep(/^\Q$dom\E/,@reqdoms)) {
1273: push(@reqdoms,$dom);
1274: }
1275: }
1276: }
1277: }
1278: my @showtypes;
1279: foreach my $type (@{$types}) {
1280: if (grep(/^\Q$type\E$/,@reqtypes)) {
1281: push(@showtypes,$type);
1282: }
1283: }
1284: my $requrl = '/adm/requestcourse';
1285: if (@reqdoms == 1) {
1286: $requrl .= '?showdom='.$reqdoms[0];
1287: }
1288: if (@showtypes > 0) {
1289: $requrl.=(($requrl=~/\?/)?'&':'?').'crstype='.$showtypes[0];
1290: }
1291: if (@reqdoms == 1 || @showtypes > 0) {
1292: $requrl .= '&state=crstype&action=new';
1293: }
1294: $r->print('</ul>'.&mt('Use the [_1]request form[_2] to submit a request for creation of a new course or community.','<a href="'.$requrl.'">','</a>').'</p>');
1295: }
1296: }
1297: return;
1298: }
1299:
1300: sub queued_selfenrollment {
1301: my ($r) = @_;
1302: my %selfenrollrequests = &Apache::lonnet::dump('selfenrollrequests');
1303: my %reqs_by_date;
1304: foreach my $item (keys(%selfenrollrequests)) {
1305: if (ref($selfenrollrequests{$item}) eq 'HASH') {
1306: if ($selfenrollrequests{$item}{'status'} eq 'request') {
1307: if ($selfenrollrequests{$item}{'timestamp'}) {
1308: push(@{$reqs_by_date{$selfenrollrequests{$item}{'timestamp'}}},$item);
1309: }
1310: }
1311: }
1312: }
1313: if (keys(%reqs_by_date)) {
1314: my $rolename = &Apache::lonnet::plaintext('st');
1315: $r->print('<b>'.&mt('Enrollment requests pending Course Coordinator approval').'</b><br />'.
1316: &Apache::loncommon::start_data_table().
1317: &Apache::loncommon::start_data_table_header_row().
1318: '<th>'.&mt('Date requested').'</th><th>'.&mt('Course title').'</th>'.
1319: '<th>'.&mt('User role').'</th><th>'.&mt('Section').'</th>'.
1320: &Apache::loncommon::end_data_table_header_row());
1321: my @sorted = sort { $a <=> $b } (keys(%reqs_by_date));
1322: foreach my $item (@sorted) {
1323: if (ref($reqs_by_date{$item}) eq 'ARRAY') {
1324: foreach my $crs (@{$reqs_by_date{$item}}) {
1325: my %courseinfo = &Apache::lonnet::coursedescription($crs);
1326: my $usec = $selfenrollrequests{$crs}{'section'};
1327: if ($usec eq '') {
1328: $usec = &mt('No section');
1329: }
1330: $r->print(&Apache::loncommon::start_data_table_row().
1331: '<td>'.&Apache::lonlocal::locallocaltime($item).'</td>'.
1332: '<td>'.$courseinfo{'description'}.'</td>'.
1333: '<td>'.$rolename.'</td><td>'.$usec.'</td>'.
1334: &Apache::loncommon::end_data_table_row());
1335: }
1336: }
1337: }
1338: $r->print(&Apache::loncommon::end_data_table());
1339: }
1340: return;
1341: }
1342:
1343: sub privileges_info {
1344: my ($which) = @_;
1345: my $output;
1346:
1347: $which ||= $env{'request.role'};
1348:
1349: foreach my $envkey (sort(keys(%env))) {
1350: next if ($envkey!~/^user\.priv\.\Q$which\E\.(.*)/);
1351:
1352: my $where=$1;
1353: my $ttype;
1354: my $twhere;
1355: my (undef,$tdom,$trest,$tsec)=split(m{/},$where);
1356: if ($trest) {
1357: if ($env{'course.'.$tdom.'_'.$trest.'.description'} eq 'ca') {
1358: $ttype='Construction Space';
1359: $twhere='User: '.$trest.', Domain: '.$tdom;
1360: } else {
1361: $ttype= &Apache::loncommon::course_type($tdom.'_'.$trest);
1362: $twhere=$env{'course.'.$tdom.'_'.$trest.'.description'};
1363: if ($tsec) {
1364: my $sec_type = 'Section';
1365: if (exists($env{"user.role.gr.$where"})) {
1366: $sec_type = 'Group';
1367: }
1368: $twhere.=' ('.$sec_type.': '.$tsec.')';
1369: }
1370: }
1371: } elsif ($tdom) {
1372: $ttype='Domain';
1373: $twhere=$tdom;
1374: } else {
1375: $ttype='System';
1376: $twhere='/';
1377: }
1378: $output .= "\n<h3>".&mt($ttype).': '.$twhere.'</h3>'."\n<ul>";
1379: foreach my $priv (sort(split(/:/,$env{$envkey}))) {
1380: next if (!$priv);
1381:
1382: my ($prv,$restr)=split(/\&/,$priv);
1383: my $trestr='';
1384: if ($restr ne 'F') {
1385: $trestr.=' ('.
1386: join(', ',
1387: map { &Apache::lonnet::plaintext($_) }
1388: (split('',$restr))).') ';
1389: }
1390: $output .= "\n\t".
1391: '<li>'.&Apache::lonnet::plaintext($prv).$trestr.'</li>';
1392: }
1393: $output .= "\n".'</ul>';
1394: }
1395: return $output;
1396: }
1397:
1398: sub build_roletext {
1399: my ($trolecode,$tdom,$trest,$tstatus,$tryagain,$advanced,$tremark,$tbg,$trole,$twhere,$tpstart,$tpend,$nochoose,$button,$switchserver,$reinit) = @_;
1400: my ($roletext,$roletext_end);
1401: my $is_dc=($trolecode =~ m/^dc\./);
1402: my $rowspan=($is_dc) ? ''
1403: : ' rowspan="2" ';
1404:
1405: unless ($nochoose) {
1406: my $buttonname=$trolecode;
1407: $buttonname=~s/\W//g;
1408: if (!$button) {
1409: if ($switchserver) {
1410: $roletext.='<td'.$rowspan.' class="'.$tbg.'">'
1411: .'<a href="/adm/switchserver?'.$switchserver.'">'
1412: .&mt('Switch Server')
1413: .'</a></td>';
1414: } else {
1415: $roletext.=('<td'.$rowspan.' class="'.$tbg.'"> </td>');
1416: }
1417: } elsif ($tstatus eq 'is') {
1418: $roletext.='<td'.$rowspan.' class="'.$tbg.'">'.
1419: '<input name="'.$buttonname.'" type="button" value="'.
1420: &mt('Select').'" onclick="javascript:enterrole(this.form,\''.
1421: $trolecode."','".$buttonname.'\');" /></td>';
1422: } elsif ($tryagain) {
1423: $roletext.=
1424: '<td'.$rowspan.' class="'.$tbg.'">'.
1425: '<input name="'.$buttonname.'" type="button" value="'.
1426: &mt('Try Selecting Again').'" onclick="javascript:enterrole(this.form,\''.
1427: $trolecode."','".$buttonname.'\');" /></td>';
1428: } elsif ($advanced) {
1429: $roletext.=
1430: '<td'.$rowspan.' class="'.$tbg.'">'.
1431: '<input name="'.$buttonname.'" type="button" value="'.
1432: &mt('Re-Initialize').'" onclick="javascript:enterrole(this.form,\''.
1433: $trolecode."','".$buttonname.'\');" /></td>';
1434: } elsif ($reinit) {
1435: $roletext.=
1436: '<td'.$rowspan.' class="'.$tbg.'">'.
1437: '<input name="'.$buttonname.'" type="button" value="'.
1438: &mt('Re-Select').'" onclick="javascript:enterrole(this.form,\''.
1439: $trolecode."','".$buttonname.'\');" /></td>';
1440: } else {
1441: $roletext.=
1442: '<td'.$rowspan.' class="'.$tbg.'">'.
1443: '<input name="'.$buttonname.'" type="button" value="'.
1444: &mt('Re-Select').'" onclick="javascript:enterrole(this.form,\''.
1445: $trolecode."','".$buttonname.'\');" /></td>';
1446: }
1447: }
1448: if ($trolecode !~ m/^(dc|ca|au|aa)\./) {
1449: $tremark.=&Apache::lonannounce::showday(time,1,
1450: &Apache::lonannounce::readcalendar($tdom.'_'.$trest));
1451: }
1452: $roletext.='<td>'.$trole.'</td>'
1453: .'<td>'.$twhere.'</td>'
1454: .'<td>'.$tpstart.'</td>'
1455: .'<td>'.$tpend.'</td>';
1456: if (!$is_dc) {
1457: $roletext_end = '<td colspan="4">'.
1458: $tremark.' '.
1459: '</td>';
1460: }
1461: return ($roletext,$roletext_end);
1462: }
1463:
1464: sub check_needs_switchserver {
1465: my ($possiblerole) = @_;
1466: my $needs_switchserver;
1467: my ($role,$where) = split(/\./,$possiblerole,2);
1468: my (undef,$tdom,$twho) = split(/\//,$where);
1469: my ($server_status,$home);
1470: if (($role eq 'ca') || ($role eq 'aa')) {
1471: ($server_status,$home) = &check_author_homeserver($twho,$tdom);
1472: } else {
1473: ($server_status,$home) = &check_author_homeserver($env{'user.name'},
1474: $env{'user.domain'});
1475: }
1476: if ($server_status eq 'switchserver') {
1477: $needs_switchserver = 1;
1478: }
1479: return $needs_switchserver;
1480: }
1481:
1482: sub check_author_homeserver {
1483: my ($uname,$udom)=@_;
1484: if (($uname eq '') || ($udom eq '')) {
1485: return ('fail','');
1486: }
1487: my $home = &Apache::lonnet::homeserver($uname,$udom);
1488: if (&Apache::lonnet::host_domain($home) ne $udom) {
1489: return ('fail',$home);
1490: }
1491: my @ids=&Apache::lonnet::current_machine_ids();
1492: if (grep(/^\Q$home\E$/,@ids)) {
1493: return ('ok',$home);
1494: } else {
1495: return ('switchserver',$home);
1496: }
1497: }
1498:
1499: sub check_fordc {
1500: my ($dcroles,$then) = @_;
1501: my $numdc = 0;
1502: if ($env{'user.adv'}) {
1503: foreach my $envkey (sort keys %env) {
1504: if ($envkey=~/^user\.role\.dc\.\/($match_domain)\/$/) {
1505: my $dcdom = $1;
1506: my $livedc = 1;
1507: my ($tstart,$tend)=split(/\./,$env{$envkey});
1508: if ($tstart && $tstart>$then) { $livedc = 0; }
1509: if ($tend && $tend <$then) { $livedc = 0; }
1510: if ($livedc) {
1511: $$dcroles{$dcdom} = $envkey;
1512: $numdc++;
1513: }
1514: }
1515: }
1516: }
1517: return $numdc;
1518: }
1519:
1520: sub adhoc_course_role {
1521: my ($refresh,$then) = @_;
1522: my ($cdom,$cnum,$crstype);
1523: $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
1524: $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
1525: $crstype = &Apache::loncommon::course_type();
1526: if (&check_forcc($cdom,$cnum,$refresh,$then,$crstype)) {
1527: my $setprivs;
1528: if (!defined($env{'user.role.'.$env{'form.switchrole'}})) {
1529: $setprivs = 1;
1530: } else {
1531: my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.switchrole'}});
1532: if (($start && ($start>$refresh || $start == -1)) ||
1533: ($end && $end<$then)) {
1534: $setprivs = 1;
1535: }
1536: }
1537: if ($setprivs) {
1538: if ($env{'form.switchrole'} =~ m-^(in|ta|ep|ad|st|cr)([\w/]*)\./\Q$cdom\E/\Q$cnum\E/?(\w*)$-) {
1539: my $role = $1;
1540: my $custom_role = $2;
1541: my $usec = $3;
1542: if ($role eq 'cr') {
1543: if ($custom_role =~ m-^/$match_domain/$match_username/\w+$-) {
1544: $role .= $custom_role;
1545: } else {
1546: return;
1547: }
1548: }
1549: my (%userroles,%newrole,%newgroups,%group_privs);
1550: my %cgroups =
1551: &Apache::lonnet::get_active_groups($env{'user.domain'},
1552: $env{'user.name'},$cdom,$cnum);
1553: foreach my $group (keys(%cgroups)) {
1554: $group_privs{$group} =
1555: $env{'user.priv.cc./'.$cdom.'/'.$cnum.'./'.$cdom.'/'.$cnum.'/'.$group};
1556: }
1557: $newgroups{'/'.$cdom.'/'.$cnum} = \%group_privs;
1558: my $area = '/'.$cdom.'/'.$cnum;
1559: my $spec = $role.'.'.$area;
1560: if ($usec ne '') {
1561: $spec .= '/'.$usec;
1562: $area .= '/'.$usec;
1563: }
1564: &Apache::lonnet::standard_roleprivs(\%newrole,$role,$cdom,$spec,$cnum,$area);
1565: &Apache::lonnet::set_userprivs(\%userroles,\%newrole,\%newgroups);
1566: my $adhocstart = $refresh-1;
1567: $userroles{'user.role.'.$spec} = $adhocstart.'.';
1568: &Apache::lonnet::appenv(\%userroles,[$role,'cm']);
1569: }
1570: }
1571: }
1572: return;
1573: }
1574:
1575: sub check_forcc {
1576: my ($cdom,$cnum,$refresh,$then,$crstype) = @_;
1577: my ($is_cc,$ccrole);
1578: if ($crstype eq 'Community') {
1579: $ccrole = 'co';
1580: } else {
1581: $ccrole = 'cc';
1582: }
1583: if ($cdom ne '' && $cnum ne '') {
1584: if (&Apache::lonnet::is_course($cdom,$cnum)) {
1585: my $envkey = 'user.role.'.$ccrole.'./'.$cdom.'/'.$cnum;
1586: if (defined($env{$envkey})) {
1587: $is_cc = 1;
1588: my ($tstart,$tend)=split(/\./,$env{$envkey});
1589: if ($tstart && $tstart>$refresh) { $is_cc = 0; }
1590: if ($tend && $tend <$then) { $is_cc = 0; }
1591: }
1592: }
1593: }
1594: return $is_cc;
1595: }
1596:
1597: sub courselink {
1598: my ($dcdom,$rowtype) = @_;
1599: my $courseform=&Apache::loncommon::selectcourse_link
1600: ('rolechoice','dccourse'.$rowtype.'_'.$dcdom,
1601: 'dcdomain'.$rowtype.'_'.$dcdom,'coursedesc'.$rowtype.'_'.
1602: $dcdom,$dcdom,undef,'Course/Community');
1603: my $hiddenitems = '<input type="hidden" name="dcdomain'.$rowtype.'_'.$dcdom.'" value="'.$dcdom.'" />'.
1604: '<input type="hidden" name="origdom'.$rowtype.'_'.$dcdom.'" value="'.$dcdom.'" />'.
1605: '<input type="hidden" name="dccourse'.$rowtype.'_'.$dcdom.'" value="" />'.
1606: '<input type="hidden" name="coursedesc'.$rowtype.'_'.$dcdom.'" value="" />';
1607: return $courseform.$hiddenitems;
1608: }
1609:
1610: sub coursepick_jscript {
1611: my %lt = &Apache::lonlocal::texthash(
1612: 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.",
1613: youc => 'You can only use this screen to select courses and communities in the current domain.',
1614: );
1615: my $verify_script = <<"END";
1616: <script type="text/javascript">
1617: // <![CDATA[
1618: function verifyCoursePick(caller) {
1619: var numbutton = getIndex(caller)
1620: var pickedCourse = document.rolechoice.elements[numbutton+4].value
1621: var pickedDomain = document.rolechoice.elements[numbutton+2].value
1622: if (document.rolechoice.elements[numbutton+2].value == document.rolechoice.elements[numbutton+3].value) {
1623: if (pickedCourse != '') {
1624: if (numbutton != -1) {
1625: var courseTarget = "cc./"+pickedDomain+"/"+pickedCourse
1626: document.rolechoice.elements[numbutton+1].name = courseTarget
1627: document.rolechoice.submit()
1628: }
1629: }
1630: else {
1631: alert("$lt{'plsu'}");
1632: }
1633: }
1634: else {
1635: alert("$lt{'youc'}")
1636: }
1637: }
1638: function getIndex(caller) {
1639: for (var i=0;i<document.rolechoice.elements.length;i++) {
1640: if (document.rolechoice.elements[i] == caller) {
1641: return i;
1642: }
1643: }
1644: return -1;
1645: }
1646: // ]]>
1647: </script>
1648: END
1649: return $verify_script;
1650: }
1651:
1652: sub coauthorlink {
1653: my ($dcdom,$rowtype) = @_;
1654: my $coauthorform=&Apache::loncommon::selectauthor_link('rolechoice',$dcdom);
1655: my $hiddenitems = '<input type="hidden" name="adhoccauname'.$rowtype.'_'.$dcdom.'" value="" />';
1656: return $coauthorform.$hiddenitems;
1657: }
1658:
1659: sub display_cc_role {
1660: my $rolekey = shift;
1661: my ($roletext,$roletext_end);
1662: my $advanced = $env{'user.adv'};
1663: my $tryagain = $env{'form.tryagain'};
1664: unless ($rolekey =~/^error\:/) {
1665: if ($rolekey =~ m{^user\.role\.(cc|co)\./($match_domain)/($match_courseid)$}) {
1666: my $ccrole = $1;
1667: my $tcourseid = $2.'_'.$3;
1668: my $trolecode = $1.'./'.$2.'/'.$3;
1669: my $twhere;
1670: my $ttype;
1671: my $tbg='LC_roles_is';
1672: my %newhash=&Apache::lonnet::coursedescription($tcourseid);
1673: if (%newhash) {
1674: $twhere=$newhash{'description'}.
1675: ' <span style="LC_fontsize_small">'.
1676: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$2,$1).
1677: '</span>';
1678: $ttype = $newhash{'type'};
1679: } else {
1680: $twhere=&mt('Currently not available');
1681: $env{'course.'.$tcourseid.'.description'}=$twhere;
1682: }
1683: my $trole = &Apache::lonnet::plaintext($ccrole,$ttype);
1684: $twhere.="<br />".&mt('Domain').":".$1;
1685: ($roletext,$roletext_end) = &build_roletext($trolecode,$1,$2,'is',$tryagain,$advanced,'',$tbg,$trole,$twhere,'','','',1,'');
1686: }
1687: }
1688: return ($roletext,$roletext_end);
1689: }
1690:
1691: sub adhoc_roles_row {
1692: my ($dcdom,$rowtype) = @_;
1693: my $output = &Apache::loncommon::continue_data_table_row()
1694: .' <td colspan="5">'
1695: .&mt('[_1]Ad hoc[_2] roles in domain [_3] --'
1696: ,'<span class="LC_cusr_emph">','</span>',$dcdom)
1697: .' ';
1698: my $selectcclink = &courselink($dcdom,$rowtype);
1699: my $ccrole = &Apache::lonnet::plaintext('co',undef,undef,1);
1700: my $carole = &Apache::lonnet::plaintext('ca');
1701: my $selectcalink = &coauthorlink($dcdom,$rowtype);
1702: $output.=$ccrole.': '.$selectcclink
1703: .' | '.$carole.': '.$selectcalink
1704: .&Apache::loncommon::end_data_table_row();
1705: return $output;
1706: }
1707:
1708: sub recent_filename {
1709: my $area=shift;
1710: return 'nohist_recent_'.&escape($area);
1711: }
1712:
1713: sub courseloadpage {
1714: my ($courseid) = @_;
1715: my $startpage;
1716: my %entry_settings = &Apache::lonnet::get('nohist_whatsnew',
1717: [$courseid.':courseinit']);
1718: my ($tmp) = %entry_settings;
1719: unless ($tmp =~ /^error: 2 /) {
1720: $startpage = $entry_settings{$courseid.':courseinit'};
1721: }
1722: if ($startpage eq '') {
1723: if (exists($env{'environment.course_init_display'})) {
1724: $startpage = $env{'environment.course_init_display'};
1725: }
1726: }
1727: return $startpage;
1728: }
1729:
1730: 1;
1731: __END__
1732:
1733: =head1 NAME
1734:
1735: Apache::lonroles - User Roles Screen
1736:
1737: =head1 SYNOPSIS
1738:
1739: Invoked by /etc/httpd/conf/srm.conf:
1740:
1741: <Location /adm/roles>
1742: PerlAccessHandler Apache::lonacc
1743: SetHandler perl-script
1744: PerlHandler Apache::lonroles
1745: ErrorDocument 403 /adm/login
1746: ErrorDocument 500 /adm/errorhandler
1747: </Location>
1748:
1749: =head1 OVERVIEW
1750:
1751: =head2 Choosing Roles
1752:
1753: C<lonroles> is a handler that allows a user to switch roles in
1754: mid-session. LON-CAPA attempts to work with "No Role Specified", the
1755: default role that a user has before selecting a role, as widely as
1756: possible, but certain handlers for example need specification which
1757: course they should act on, etc. Both in this scenario, and when the
1758: handler determines via C<lonnet>'s C<&allowed> function that a certain
1759: action is not allowed, C<lonroles> is used as error handler. This
1760: allows the user to select another role which may have permission to do
1761: what they were trying to do. C<lonroles> can also be accessed via the
1762: B<CRS> button in the Remote Control.
1763:
1764: =begin latex
1765:
1766: \begin{figure}
1767: \begin{center}
1768: \includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen}
1769: \caption{\label{Sample_Roles_Screen}Sample Roles Screen}
1770: \end{center}
1771: \end{figure}
1772:
1773: =end latex
1774:
1775: =head2 Role Initialization
1776:
1777: 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.
1778:
1779: =head1 INTRODUCTION
1780:
1781: This module enables a user to select what role he wishes to
1782: operate under (instructor, student, teaching assistant, course
1783: coordinator, etc). These roles are pre-established by the actions
1784: of upper-level users.
1785:
1786: This is part of the LearningOnline Network with CAPA project
1787: described at http://www.lon-capa.org.
1788:
1789: =head1 HANDLER SUBROUTINE
1790:
1791: This routine is called by Apache and mod_perl.
1792:
1793: =over 4
1794:
1795: =item *
1796:
1797: Roles Initialization (yes/no)
1798:
1799: =item *
1800:
1801: Get Error Message from Environment
1802:
1803: =item *
1804:
1805: Who is this?
1806:
1807: =item *
1808:
1809: Generate Page Output
1810:
1811: =item *
1812:
1813: Choice or no choice
1814:
1815: =item *
1816:
1817: Table
1818:
1819: =item *
1820:
1821: Privileges
1822:
1823: =back
1824:
1825: =cut
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