1: # The LearningOnline Network with CAPA
2: # User Roles Screen
3: #
4: # $Id: lonroles.pm,v 1.82 2004/01/15 20:22:47 www 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: # (Directory Indexer
29: # (Login Screen
30: # YEAR=1999
31: # 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14 Gerd Kortemeyer)
32: # 11/23 Gerd Kortemeyer)
33: # YEAR=2000
34: # 1/14,03/06,06/01,07/22,07/24,07/25,
35: # 09/04,09/06,09/28,09/29,09/30,10/2,10/5,10/26,10/28,
36: # 12/08,12/28,
37: # YEAR=2001
38: # 01/15/01 Gerd Kortemeyer
39: # 03/02,05/03,05/25,05/30,06/01,07/06,08/06 Gerd Kortemeyer
40: # 12/29 Gerd Kortemeyer
41: #
42: ###
43:
44: package Apache::lonroles;
45:
46: use strict;
47: use Apache::lonnet();
48: use Apache::lonuserstate();
49: use Apache::Constants qw(:common);
50: use Apache::File();
51: use Apache::lonmenu;
52: use Apache::loncommon;
53: use Apache::lonannounce;
54: use Apache::lonlocal;
55:
56: sub redirect_user {
57: my ($r,$title,$url,$msg) = @_;
58: $msg = $title if (! defined($msg));
59: &Apache::loncommon::content_type($r,'text/html');
60: &Apache::loncommon::no_cache($r);
61: $r->send_http_header;
62: my $swinfo=&Apache::lonmenu::rawconfig();
63: my $bodytag=&Apache::loncommon::bodytag('Switching Role');
64: $r->print (<<ENDREDIR);
65: <head><title>$title</title>
66: <meta HTTP-EQUIV="Refresh" CONTENT="1; url=$url">
67: </head>
68: <html>
69: $bodytag
70: <script>
71: $swinfo
72: </script>
73: <h1>$msg</h1>
74: </body>
75: </html>
76: ENDREDIR
77: return;
78: }
79:
80: sub handler {
81:
82: my $r = shift;
83:
84: my $now=time;
85: my $then=$ENV{'user.login.time'};
86: my $envkey;
87:
88:
89: # ================================================================== Roles Init
90:
91: if ($ENV{'form.selectrole'}) {
92: if ($ENV{'request.course.id'}) {
93: my %temp=('logout_'.$ENV{'request.course.id'} => time);
94: &Apache::lonnet::put('email_status',\%temp);
95: }
96: &Apache::lonnet::appenv("request.course.id" => '',
97: "request.course.fn" => '',
98: "request.course.uri" => '',
99: "request.course.sec" => '',
100: "request.role" => 'cm',
101: "request.role.adv" => $ENV{'user.adv'},
102: "request.role.domain" => $ENV{'user.domain'});
103: foreach $envkey (keys %ENV) {
104: next if ($envkey!~/^user\.role\./);
105: my (undef,undef,$role,@pwhere)=split(/\./,$envkey);
106: my $where=join('.',@pwhere);
107: my $trolecode=$role.'.'.$where;
108: if ($ENV{'form.'.$trolecode}) {
109: my ($tstart,$tend)=split(/\./,$ENV{$envkey});
110: my $tstatus='is';
111: if ($tstart) {
112: if ($tstart>$then) {
113: $tstatus='future';
114: }
115: }
116: if ($tend) {
117: if ($tend<$then) { $tstatus='expired'; }
118: if ($tend<$now) { $tstatus='will_not'; }
119: }
120: if ($tstatus eq 'is') {
121: $where=~s/^\///;
122: my ($cdom,$cnum,$csec)=split(/\//,$where);
123: # check for keyed access
124: if (($role eq 'st') &&
125: ($ENV{'course.'.$cdom.'_'.$cnum.'.keyaccess'} eq 'yes')) {
126: unless (&Apache::lonnet::validate_access_key(
127: $ENV{'environment.key.'.$cdom.'_'.$cnum},
128: $cdom,$cnum)) {
129: # there is no valid key
130: if ($ENV{'form.newkey'}) {
131: # student attempts to register a new key
132: } else {
133: # print form to enter a new key
134: &Apache::loncommon::content_type($r,'text/html');
135: &Apache::loncommon::no_cache($r);
136: $r->send_http_header;
137: my $swinfo=&Apache::lonmenu::rawconfig();
138: my $bodytag=&Apache::loncommon::bodytag
139: ('Enter Access Key to Unlock this Course');
140: $r->print(<<ENDENTERKEY);
141: <head><title>Entering Course Access Key</title>
142: </head>
143: <html>
144: $bodytag
145: <script>
146: $swinfo
147: </script>
148: <form method="post">
149: <input type="hidden" name="selectrole" value="$ENV{'form.selectrole'}" />
150: <input type="text" size="20" name="newkey" value="$ENV{'form.newkey'}" />
151: <input type="submit" value="Enter key" />
152: </form>
153: </body></html>
154: ENDENTERKEY
155: return OK;
156: }
157: }
158: }
159: my $tadv=0;
160: if (($trolecode!~/^st/) &&
161: ($trolecode!~/^ta/) &&
162: ($trolecode!~/^cm/)) { $tadv=1; }
163: &Apache::lonnet::appenv(
164: 'request.role' => $trolecode,
165: 'request.role.adv' => $tadv,
166: 'request.role.domain' => $cdom,
167: 'request.course.sec' => $csec);
168: my $msg=&mt('Entering course ...');
169:
170: if (($cnum) && ($role ne 'ca')) {
171: my ($furl,$ferr)=
172: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
173: if (($ENV{'form.orgurl'}) &&
174: ($ENV{'form.orgurl'}!~/^\/adm\/flip/)) {
175: my $dest=$ENV{'form.orgurl'};
176: if ( &Apache::lonnet::mod_perl_version() == 2 ) {
177: &Apache::lonnet::cleanenv();
178: }
179: $r->internal_redirect($dest);
180: return OK;
181: } else {
182: unless ($ENV{'request.course.id'}) {
183: &Apache::lonnet::appenv(
184: "request.course.id" => $cdom.'_'.$cnum);
185: $furl='/adm/roles?tryagain=1';
186: $msg=
187: '<h1><font color=red>'.
188: &mt('Could not initialize course at this time.').
189: '</font></h1><h3>'.&mt('Please try again.').'</h3>'.$ferr;
190: }
191:
192: # Check to see if the user is a CC entering a course
193: # for the first time
194: my (undef, undef, $role, $courseid) = split(/\./, $envkey);
195: if (substr($courseid, 0, 1) eq '/') {
196: $courseid = substr($courseid, 1);
197: }
198: $courseid =~ s/\//_/;
199: if ($role eq 'cc' && $ENV{'course.' . $courseid .
200: '.course.helper.not.run'}) {
201: $furl = "/adm/helper/course.initialization.helper";
202: }
203: #
204: # Send the user to the course they selected
205: &redirect_user($r,&mt('Entering Course'),
206: $furl,$msg);
207: return OK;
208: }
209: }
210: #
211: # Send the user to the construction space they selected
212: if ($role =~ /^(au|ca)$/) {
213: my $redirect_url = '/priv/';
214: if ($role eq 'au') {
215: $redirect_url.=$ENV{'user.name'};
216: } else {
217: $where =~ /\/(.*)$/;
218: $redirect_url .= $1;
219: }
220: $redirect_url .= '/';
221: &redirect_user($r,&mt('Entering Construction Space'),
222: $redirect_url);
223: return OK;
224: }
225: }
226: }
227: }
228: }
229:
230:
231: # =============================================================== No Roles Init
232:
233: &Apache::loncommon::content_type($r,'text/html');
234: &Apache::loncommon::no_cache($r);
235: $r->send_http_header;
236: return OK if $r->header_only;
237:
238: my $swinfo=&Apache::lonmenu::rawconfig();
239: my $bodytag=&Apache::loncommon::bodytag('User Roles');
240: my $helptag='<table><tr><td>'.&Apache::loncommon::help_open_topic
241: ("General_Intro",&mt("Click here for help")).'</td><td>'.
242: &Apache::loncommon::help_open_faq(1,&mt('Click here for FAQ')).'</td><td>'.
243: &Apache::loncommon::help_open_bug('',&mt('Click here to report bugs')).'</td></tr></table>';
244: $r->print(<<ENDHEADER);
245: <html>
246: <head>
247: <title>LON-CAPA User Roles</title>
248: </head>
249: $bodytag
250: $helptag<br />
251: <script>
252: $swinfo
253: window.focus();
254: </script>
255: ENDHEADER
256:
257: # ------------------------------------------ Get Error Message from Environment
258:
259: my ($fn,$priv,$nochoose,$error,$msg)=split(/:/,$ENV{'user.error.msg'});
260: if ($ENV{'user.error.msg'}) {
261: $r->log_reason(
262: "$msg for $ENV{'user.name'} domain $ENV{'user.domain'} access $priv",$fn);
263: }
264:
265: # ------------------------------------------------- Can this user re-init, etc?
266:
267: my $advanced=$ENV{'user.adv'};
268: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['tryagain']);
269: my $tryagain=$ENV{'form.tryagain'};
270:
271: # -------------------------------------------------------- Generate Page Output
272: # --------------------------------------------------------------- Error Header?
273: if ($error) {
274: $r->print("<h1>LON-CAPA Access Control</h1>");
275: $r->print("<hr><pre>Access : ".
276: Apache::lonnet::plaintext($priv)."\n");
277: $r->print("Resource: $fn\n");
278: $r->print("Action : $msg\n</pre><hr>");
279: } else {
280: if ($ENV{'user.error.msg'}) {
281: $r->print(
282: '<h3><font color=red>'.
283: &mt('You need to choose another user role or enter a specific course for this function').'</font></h3>');
284: }
285: }
286: # -------------------------------------------------------- Choice or no choice?
287: if ($nochoose) {
288: if ($advanced) {
289: $r->print("<h2>".&mt('Assigned User Roles')."</h2>\n");
290: } else {
291: $r->print("<h2>".&mt('Sorry ...')."</h2>\n".
292: &mt('This resource might be part of'));
293: if ($ENV{'request.course.id'}) {
294: $r->print(&mt(' another'));
295: } else {
296: $r->print(&mt(' a certain'));
297: }
298: $r->print(&mt(' course.').'</body></html>');
299: return OK;
300: }
301: } else {
302: if ($advanced) {
303: $r->print(&mt("Your home server is ").
304: $Apache::lonnet::hostname{&Apache::lonnet::homeserver
305: ($ENV{'user.name'},$ENV{'user.domain'})}.
306: "<br />\n");
307: $r->print(&mt(
308: "Author and Co-Author roles may not be available on servers other than your home server."));
309: } else {
310: $r->print("<h2>".&mt('Select a Course to Enter')."</h2>\n");
311: }
312: if (($ENV{'REDIRECT_QUERY_STRING'}) && ($fn)) {
313: $fn.='?'.$ENV{'REDIRECT_QUERY_STRING'};
314: }
315: $r->print('<form method=post action="'.(($fn)?$fn:$r->uri).'">');
316: $r->print('<input type=hidden name=orgurl value="'.$fn.'">');
317: $r->print('<input type=hidden name=selectrole value=1>');
318: }
319: if ($ENV{'user.adv'}) {
320: $r->print(
321: '<br />'.&mt('Show all roles').': <input type="checkbox" name="showall"');
322: if ($ENV{'form.showall'}) { $r->print(' checked'); }
323: $r->print('><input type=submit value="'.&mt('Display').'">');
324: }
325: # ----------------------------------------------------------------------- Table
326: $r->print('<br /><table><tr>');
327: unless ($nochoose) { $r->print('<th> </th>'); }
328: $r->print('<th>'.&mt('User Role').'</th><th colspan=2>'.&mt('Extent').
329: '</th><th>'.&mt('Start').'</th><th>'.&mt('End').'</th><th>'.
330: &mt('Remark').'</th></tr>'."\n");
331:
332: my (%roletext,%sortrole,%roleclass);
333: foreach $envkey (sort keys %ENV) {
334: my $button = 1;
335: my $switchserver='';
336: my $roletext;
337: my $sortkey;
338: if ($envkey=~/^user\.role\./) {
339: my (undef,undef,$role,@pwhere)=split(/\./,$envkey);
340: next if (!defined($role) || $role eq '');
341: my $where=join('.',@pwhere);
342: my $trolecode=$role.'.'.$where;
343: my ($tstart,$tend)=split(/\./,$ENV{$envkey});
344: my $tremark='';
345: my $tstatus='is';
346: my $tpstart=' ';
347: my $tpend=' ';
348: my $tfont='#000000';
349: if ($tstart) {
350: if ($tstart>$then) {
351: $tstatus='future';
352: if ($tstart<$now) { $tstatus='will'; }
353: }
354: $tpstart=&Apache::lonlocal::locallocaltime($tstart);
355: }
356: if ($tend) {
357: if ($tend<$then) {
358: $tstatus='expired';
359: } elsif ($tend<$now) {
360: $tstatus='will_not';
361: }
362: $tpend=&Apache::lonlocal::locallocaltime($tend);
363: }
364: if ($ENV{'request.role'} eq $trolecode) {
365: $tstatus='selected';
366: }
367: my $tbg;
368: if (($tstatus eq 'is') || ($tstatus eq 'selected') ||
369: ($ENV{'form.showall'})) {
370: if ($tstatus eq 'is') {
371: $tbg='#77FF77';
372: $tfont='#003300';
373: } elsif ($tstatus eq 'future') {
374: $tbg='#FFFF77';
375: $button=0;
376: } elsif ($tstatus eq 'will') {
377: $tbg='#FFAA77';
378: $tremark.=&mt('Active at next login. ');
379: } elsif ($tstatus eq 'expired') {
380: $tbg='#FF7777';
381: $tfont='#330000';
382: $button=0;
383: } elsif ($tstatus eq 'will_not') {
384: $tbg='#AAFF77';
385: $tremark.=&mt('Expired after logout. ');
386: } elsif ($tstatus eq 'selected') {
387: $tbg='#11CC55';
388: $tfont='#002200';
389: $tremark.=&mt('Currently selected. ');
390: }
391: my $trole;
392: if ($role =~ /^cr\//) {
393: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$role);
394: $tremark.='<br>'.&mt('Defined by ').$rauthor.
395: &mt(' at ').$rdomain.'.';
396: $trole=$rrole;
397: } else {
398: $trole=Apache::lonnet::plaintext($role);
399: }
400: my $ttype;
401: my $twhere;
402: my ($tdom,$trest,$tsection)=
403: split(/\//,Apache::lonnet::declutter($where));
404: # First, Co-Authorship roles
405: if ($role eq 'ca') {
406: my $home = &Apache::lonnet::homeserver($trest,$tdom);
407: if ($home ne $r->dir_config('lonHostID')) {
408: $button=0;
409: $switchserver=&Apache::lonnet::escape('http://'.
410: $Apache::lonnet::hostname{$home}.
411: '/adm/login?domain='.$ENV{'user.domain'}.
412: '&username='.$ENV{'user.name'}.
413: '&firsturl=/priv/'.$trest);
414: }
415: #next if ($home eq 'no_host');
416: $home = $Apache::lonnet::hostname{$home};
417: $ttype='Construction Space';
418: $twhere=&mt('User').': '.$trest.'<br />'.&mt('Domain').
419: ': '.$tdom.'<br />'.
420: ' '.&mt('Server').': '.$home;
421: $ENV{'course.'.$tdom.'_'.$trest.'.description'}='ca';
422: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$trest.'/');
423: $sortkey=$role."$trest:$tdom";
424: } elsif ($role eq 'au') {
425: # Authors
426: my $home = &Apache::lonnet::homeserver
427: ($ENV{'user.name'},$ENV{'user.domain'});
428: if ($home ne $r->dir_config('lonHostID')) {
429: $button=0;
430: $switchserver=&Apache::lonnet::escape('http://'.
431: $Apache::lonnet::hostname{$home}.
432: '/adm/login?domain='.$ENV{'user.domain'}.
433: '&username='.$ENV{'user.name'}.
434: '&firsturl=/priv/'.$ENV{'user.name'});
435: }
436: #next if ($home eq 'no_host');
437: $home = $Apache::lonnet::hostname{$home};
438: $ttype='Construction Space';
439: $twhere=&mt('Domain').': '.$tdom.'<br />'.&mt('Server').
440: ': '.$home;
441: $ENV{'course.'.$tdom.'_'.$trest.'.description'}='ca';
442: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$ENV{'user.name'}.'/');
443: $sortkey=$role;
444: } elsif ($trest) {
445: $ttype='Course';
446: if ($tsection) {
447: $ttype.='<br>'.&mt('Section/Group').': '.$tsection;
448: }
449: my $tcourseid=$tdom.'_'.$trest;
450: if ($ENV{'course.'.$tcourseid.'.description'}) {
451: $twhere=$ENV{'course.'.$tcourseid.'.description'};
452: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
453: unless ($twhere eq &mt('Currently not available')) {
454: $twhere.=' <font size="-2">'.
455: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom,$tfont).
456: '</font>';
457: }
458: } else {
459: my %newhash=Apache::lonnet::coursedescription
460: ($tcourseid);
461: if (%newhash) {
462: $sortkey=$role."\0".$tdom."\0".$newhash{'description'}.
463: "\0".$envkey;
464: $twhere=$newhash{'description'}.
465: ' <font size="-2">'.
466: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom,$tfont).
467: '</font>';
468: } else {
469: $twhere=&mt('Currently not available');
470: $ENV{'course.'.$tcourseid.'.description'}=$twhere;
471: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
472: }
473: }
474: if ($role ne 'st') { $twhere.="<br />".&mt('Domain').":".$tdom; }
475: } elsif ($tdom) {
476: $ttype='Domain';
477: $twhere=$tdom;
478: $sortkey=$role.$twhere;
479: } else {
480: $ttype='System';
481: $twhere=&mt('system wide');
482: $sortkey=$role.$twhere;
483: }
484:
485: $roletext.='<tr bgcolor='.$tbg.'>';
486: unless ($nochoose) {
487: if (!$button) {
488: if ($switchserver) {
489: $roletext.='<td><a href="/adm/logout?handover='.
490: $switchserver.'">'.&mt('Switch Server').'</a></td>';
491: } else {
492: $roletext.=('<td> </td>');
493: }
494: } elsif ($tstatus eq 'is') {
495: $roletext.=('<td><input type=submit value="'.
496: &mt('Select').'" name="'.
497: $trolecode.'"></td>');
498: } elsif ($tryagain) {
499: $roletext.=
500: '<td><input type=submit value="'.
501: &mt('Try Selecting Again').'" name="'.$trolecode.'"></td>';
502: } elsif ($advanced) {
503: $roletext.=
504: '<td><input type=submit value="'.
505: &mt('Re-Initialize').'" name="'.$trolecode.'"></td>';
506: } else {
507: $roletext.='<td> </td>';
508: }
509: }
510: $tremark.=&Apache::lonannounce::showday(time,1,
511: &Apache::lonannounce::readcalendar($tdom.'_'.$trest));
512:
513: $roletext.='<td><font color="'.$tfont.'">'.$trole.
514: '</font></td><td><font color="'.$tfont.'">'.$ttype.
515: '</font></td><td><font color="'.$tfont.'">'.$twhere.
516: '</font></td><td><font color="'.$tfont.'">'.$tpstart.
517: '</font></td><td><font color="'.$tfont.'">'.$tpend.
518: '</font></td><td><font color="'.$tfont.'">'.$tremark.
519: ' </font></td></tr>'."\n";
520: $roletext{$envkey}=$roletext;
521: if (!$sortkey) {$sortkey=$twhere."\0".$envkey;}
522: $sortrole{$sortkey}=$envkey;
523: $roleclass{$envkey}=$ttype;
524: }
525: }
526: }
527: my $doheaders=-1;
528: foreach my $type ('Construction Space','Course','Domain','System') {
529: my $haverole=0;
530: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%sortrole))) {
531: if ($roleclass{$sortrole{$which}} =~ /^\Q$type\E/) {
532: $haverole=1;
533: }
534: }
535: if ($haverole) { $doheaders++; }
536: }
537: foreach my $type ('Construction Space','Course','Domain','System') {
538: my $output;
539: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%sortrole))) {
540: if ($roleclass{$sortrole{$which}} =~ /^\Q$type\E/) {
541: $output.=&mt($roletext{$sortrole{$which}});
542: }
543: }
544: if ($output) {
545: if ($doheaders > 0) {
546: $r->print("<tr bgcolor='#BBffBB'>".
547: "<td align='center' colspan='7'>".&mt($type)."</td>");
548: }
549: $r->print($output);
550: }
551: }
552: my $tremark='';
553: my $tfont='#003300';
554: if ($ENV{'request.role'} eq 'cm') {
555: $r->print('<tr bgcolor="#11CC55">');
556: $tremark=&mt('Currently selected. ');
557: $tfont='#002200';
558: } else {
559: $r->print('<tr bgcolor="#77FF77">');
560: }
561: unless ($nochoose) {
562: if ($ENV{'request.role'} ne 'cm') {
563: $r->print('<td><input type=submit value="'.
564: &mt('Select').'" name="cm"></td>');
565: } else {
566: $r->print('<td> </td>');
567: }
568: }
569: $r->print('<td colspan=5><font color="'.$tfont.'">'.&mt('No role specified').
570: '</font></td><td><font color="'.$tfont.'">'.$tremark.
571: ' </font></td></tr>'."\n");
572:
573: $r->print('</table>');
574: unless ($nochoose) {
575: $r->print("</form>\n");
576: }
577: # ------------------------------------------------------------ Privileges Info
578: if (($advanced) && (($ENV{'user.error.msg'}) || ($error))) {
579: $r->print('<hr><h2>Current Privileges</h2>');
580:
581: foreach $envkey (sort keys %ENV) {
582: if ($envkey=~/^user\.priv\.$ENV{'request.role'}\./) {
583: my $where=$envkey;
584: $where=~s/^user\.priv\.$ENV{'request.role'}\.//;
585: my $ttype;
586: my $twhere;
587: my ($tdom,$trest,$tsec)=
588: split(/\//,Apache::lonnet::declutter($where));
589: if ($trest) {
590: if ($ENV{'course.'.$tdom.'_'.$trest.'.description'} eq 'ca') {
591: $ttype='Construction Space';
592: $twhere='User: '.$trest.', Domain: '.$tdom;
593: } else {
594: $ttype='Course';
595: $twhere=$ENV{'course.'.$tdom.'_'.$trest.'.description'};
596: if ($tsec) {
597: $twhere.=' (Section/Group: '.$tsec.')';
598: }
599: }
600: } elsif ($tdom) {
601: $ttype='Domain';
602: $twhere=$tdom;
603: } else {
604: $ttype='System';
605: $twhere='/';
606: }
607: $r->print("\n<h3>".$ttype.': '.$twhere.'</h3><ul>');
608: foreach (sort split(/:/,$ENV{$envkey})) {
609: if ($_) {
610: my ($prv,$restr)=split(/\&/,$_);
611: my $trestr='';
612: if ($restr ne 'F') {
613: my $i;
614: $trestr.=' (';
615: for ($i=0;$i<length($restr);$i++) {
616: $trestr.=
617: Apache::lonnet::plaintext(substr($restr,$i,1));
618: if ($i<length($restr)-1) { $trestr.=', '; }
619: }
620: $trestr.=')';
621: }
622: $r->print('<li>'.
623: Apache::lonnet::plaintext($prv).$trestr.
624: '</li>');
625: }
626: }
627: $r->print('</ul>');
628: }
629: }
630: }
631: $r->print(&Apache::lonnet::getannounce());
632: if ($advanced) {
633: $r->print('<p><small><i>This is LON-CAPA '.
634: $r->dir_config('lonVersion').'</i></small></p>');
635: }
636: $r->print("</body></html>\n");
637: return OK;
638: }
639:
640: 1;
641: __END__
642:
643: =head1 NAME
644:
645: Apache::lonroles - User Roles Screen
646:
647: =head1 SYNOPSIS
648:
649: Invoked by /etc/httpd/conf/srm.conf:
650:
651: <Location /adm/roles>
652: PerlAccessHandler Apache::lonacc
653: SetHandler perl-script
654: PerlHandler Apache::lonroles
655: ErrorDocument 403 /adm/login
656: ErrorDocument 500 /adm/errorhandler
657: </Location>
658:
659: =head1 OVERVIEW
660:
661: =head2 Choosing Roles
662:
663: C<lonroles> is a handler that allows a user to switch roles in
664: mid-session. LON-CAPA attempts to work with "No Role Specified", the
665: default role that a user has before selecting a role, as widely as
666: possible, but certain handlers for example need specification which
667: course they should act on, etc. Both in this scenario, and when the
668: handler determines via C<lonnet>'s C<&allowed> function that a certain
669: action is not allowed, C<lonroles> is used as error handler. This
670: allows the user to select another role which may have permission to do
671: what they were trying to do. C<lonroles> can also be accessed via the
672: B<CRS> button in the Remote Control.
673:
674: =begin latex
675:
676: \begin{figure}
677: \begin{center}
678: \includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen}
679: \caption{\label{Sample_Roles_Screen}Sample Roles Screen}
680: \end{center}
681: \end{figure}
682:
683: =end latex
684:
685: =head2 Role Initialization
686:
687: 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.
688:
689: =head1 INTRODUCTION
690:
691: This module enables a user to select what role he wishes to
692: operate under (instructor, student, teaching assistant, course
693: coordinator, etc). These roles are pre-established by the actions
694: of upper-level users.
695:
696: This is part of the LearningOnline Network with CAPA project
697: described at http://www.lon-capa.org.
698:
699: =head1 HANDLER SUBROUTINE
700:
701: This routine is called by Apache and mod_perl.
702:
703: =over 4
704:
705: =item *
706:
707: Roles Initialization (yes/no)
708:
709: =item *
710:
711: Get Error Message from Environment
712:
713: =item *
714:
715: Who is this?
716:
717: =item *
718:
719: Generate Page Output
720:
721: =item *
722:
723: Choice or no choice
724:
725: =item *
726:
727: Table
728:
729: =item *
730:
731: Privileges
732:
733: =back
734:
735: =cut
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