1: # The LearningOnline Network with CAPA
2: # User Roles Screen
3: #
4: # $Id: lonroles.pm,v 1.87 2004/03/05 01:55:01 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: ###
29:
30: package Apache::lonroles;
31:
32: use strict;
33: use Apache::lonnet();
34: use Apache::lonuserstate();
35: use Apache::Constants qw(:common);
36: use Apache::File();
37: use Apache::lonmenu;
38: use Apache::loncommon;
39: use Apache::lonannounce;
40: use Apache::lonlocal;
41:
42: sub redirect_user {
43: my ($r,$title,$url,$msg) = @_;
44: $msg = $title if (! defined($msg));
45: &Apache::loncommon::content_type($r,'text/html');
46: &Apache::loncommon::no_cache($r);
47: $r->send_http_header;
48: my $swinfo=&Apache::lonmenu::rawconfig();
49: my $bodytag=&Apache::loncommon::bodytag('Switching Role');
50: $r->print (<<ENDREDIR);
51: <head><title>$title</title>
52: <meta HTTP-EQUIV="Refresh" CONTENT="1; url=$url">
53: </head>
54: <html>
55: $bodytag
56: <script>
57: $swinfo
58: </script>
59: <h1>$msg</h1>
60: </body>
61: </html>
62: ENDREDIR
63: return;
64: }
65:
66: sub handler {
67:
68: my $r = shift;
69:
70: my $now=time;
71: my $then=$ENV{'user.login.time'};
72: my $envkey;
73:
74:
75: # ================================================================== Roles Init
76:
77: if ($ENV{'form.selectrole'}) {
78: if ($ENV{'request.course.id'}) {
79: my %temp=('logout_'.$ENV{'request.course.id'} => time);
80: &Apache::lonnet::put('email_status',\%temp);
81: }
82: &Apache::lonnet::appenv("request.course.id" => '',
83: "request.course.fn" => '',
84: "request.course.uri" => '',
85: "request.course.sec" => '',
86: "request.role" => 'cm',
87: "request.role.adv" => $ENV{'user.adv'},
88: "request.role.domain" => $ENV{'user.domain'});
89: foreach $envkey (keys %ENV) {
90: next if ($envkey!~/^user\.role\./);
91: my (undef,undef,$role,@pwhere)=split(/\./,$envkey);
92: my $where=join('.',@pwhere);
93: my $trolecode=$role.'.'.$where;
94: if ($ENV{'form.'.$trolecode}) {
95: my ($tstart,$tend)=split(/\./,$ENV{$envkey});
96: my $tstatus='is';
97: if ($tstart) {
98: if ($tstart>$then) {
99: $tstatus='future';
100: }
101: }
102: if ($tend) {
103: if ($tend<$then) { $tstatus='expired'; }
104: if ($tend<$now) { $tstatus='will_not'; }
105: }
106: if ($tstatus eq 'is') {
107: $where=~s/^\///;
108: my ($cdom,$cnum,$csec)=split(/\//,$where);
109: # check for keyed access
110: if (($role eq 'st') &&
111: ($ENV{'course.'.$cdom.'_'.$cnum.'.keyaccess'} eq 'yes')) {
112: unless (&Apache::lonnet::validate_access_key(
113: $ENV{'environment.key.'.$cdom.'_'.$cnum},
114: $cdom,$cnum)) {
115: # there is no valid key
116: if ($ENV{'form.newkey'}) {
117: # student attempts to register a new key
118: } else {
119: # print form to enter a new key
120: &Apache::loncommon::content_type($r,'text/html');
121: &Apache::loncommon::no_cache($r);
122: $r->send_http_header;
123: my $swinfo=&Apache::lonmenu::rawconfig();
124: my $bodytag=&Apache::loncommon::bodytag
125: ('Enter Access Key to Unlock this Course');
126: $r->print(<<ENDENTERKEY);
127: <head><title>Entering Course Access Key</title>
128: </head>
129: <html>
130: $bodytag
131: <script>
132: $swinfo
133: </script>
134: <form method="post">
135: <input type="hidden" name="selectrole" value="$ENV{'form.selectrole'}" />
136: <input type="text" size="20" name="newkey" value="$ENV{'form.newkey'}" />
137: <input type="submit" value="Enter key" />
138: </form>
139: </body></html>
140: ENDENTERKEY
141: return OK;
142: }
143: }
144: }
145: &Apache::lonnet::log($ENV{'user.domain'},
146: $ENV{'user.name'},
147: $ENV{'user.home'},
148: "Role ".$trolecode);
149: my $tadv=0;
150: if (($trolecode!~/^st/) &&
151: ($trolecode!~/^ta/) &&
152: ($trolecode!~/^cm/)) { $tadv=1; }
153: &Apache::lonnet::appenv(
154: 'request.role' => $trolecode,
155: 'request.role.adv' => $tadv,
156: 'request.role.domain' => $cdom,
157: 'request.course.sec' => $csec);
158: my $msg=&mt('Entering course ...');
159:
160: if (($cnum) && ($role ne 'ca')) {
161: my ($furl,$ferr)=
162: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
163: if (($ENV{'form.orgurl'}) &&
164: ($ENV{'form.orgurl'}!~/^\/adm\/flip/)) {
165: my $dest=$ENV{'form.orgurl'};
166: if ( &Apache::lonnet::mod_perl_version() == 2 ) {
167: &Apache::lonnet::cleanenv();
168: }
169: $r->internal_redirect($dest);
170: return OK;
171: } else {
172: unless ($ENV{'request.course.id'}) {
173: &Apache::lonnet::appenv(
174: "request.course.id" => $cdom.'_'.$cnum);
175: $furl='/adm/roles?tryagain=1';
176: $msg=
177: '<h1><font color=red>'.
178: &mt('Could not initialize course at this time.').
179: '</font></h1><h3>'.&mt('Please try again.').'</h3>'.$ferr;
180: }
181:
182: # Check to see if the user is a CC entering a course
183: # for the first time
184: my (undef, undef, $role, $courseid) = split(/\./, $envkey);
185: if (substr($courseid, 0, 1) eq '/') {
186: $courseid = substr($courseid, 1);
187: }
188: $courseid =~ s/\//_/;
189: if ($role eq 'cc' && $ENV{'course.' . $courseid .
190: '.course.helper.not.run'}) {
191: $furl = "/adm/helper/course.initialization.helper";
192: }
193: #
194: # Send the user to the course they selected
195: &redirect_user($r,&mt('Entering Course'),
196: $furl,$msg);
197: return OK;
198: }
199: }
200: #
201: # Send the user to the construction space they selected
202: if ($role =~ /^(au|ca)$/) {
203: my $redirect_url = '/priv/';
204: if ($role eq 'au') {
205: $redirect_url.=$ENV{'user.name'};
206: } else {
207: $where =~ /\/(.*)$/;
208: $redirect_url .= $1;
209: }
210: $redirect_url .= '/';
211: &redirect_user($r,&mt('Entering Construction Space'),
212: $redirect_url);
213: return OK;
214: }
215: }
216: }
217: }
218: }
219:
220:
221: # =============================================================== No Roles Init
222:
223: &Apache::loncommon::content_type($r,'text/html');
224: &Apache::loncommon::no_cache($r);
225: $r->send_http_header;
226: return OK if $r->header_only;
227:
228: my $swinfo=&Apache::lonmenu::rawconfig();
229: my $bodytag=&Apache::loncommon::bodytag('User Roles');
230: my $helptag='<table><tr><td>'.&Apache::loncommon::help_open_topic
231: ("General_Intro",&mt("Click here for help")).'</td><td>'.
232: &Apache::loncommon::help_open_faq(1,&mt('Click here for FAQ')).'</td><td>'.
233: &Apache::loncommon::help_open_bug('',&mt('Click here to report bugs')).'</td></tr></table>';
234: $r->print(<<ENDHEADER);
235: <html>
236: <head>
237: <title>LON-CAPA User Roles</title>
238: </head>
239: $bodytag
240: $helptag<br />
241: <script>
242: $swinfo
243: window.focus();
244: </script>
245: ENDHEADER
246:
247: # ------------------------------------------ Get Error Message from Environment
248:
249: my ($fn,$priv,$nochoose,$error,$msg)=split(/:/,$ENV{'user.error.msg'});
250: if ($ENV{'user.error.msg'}) {
251: $r->log_reason(
252: "$msg for $ENV{'user.name'} domain $ENV{'user.domain'} access $priv",$fn);
253: }
254:
255: # ------------------------------------------------- Can this user re-init, etc?
256:
257: my $advanced=$ENV{'user.adv'};
258: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['tryagain']);
259: my $tryagain=$ENV{'form.tryagain'};
260:
261: # -------------------------------------------------------- Generate Page Output
262: # --------------------------------------------------------------- Error Header?
263: if ($error) {
264: $r->print("<h1>LON-CAPA Access Control</h1>");
265: $r->print("<hr><pre>Access : ".
266: Apache::lonnet::plaintext($priv)."\n");
267: $r->print("Resource: $fn\n");
268: $r->print("Action : $msg\n</pre><hr>");
269: } else {
270: if ($ENV{'user.error.msg'}) {
271: $r->print(
272: '<h3><font color=red>'.
273: &mt('You need to choose another user role or enter a specific course for this function').'</font></h3>');
274: }
275: }
276: # -------------------------------------------------------- Choice or no choice?
277: if ($nochoose) {
278: if ($advanced) {
279: $r->print("<h2>".&mt('Assigned User Roles')."</h2>\n");
280: } else {
281: $r->print("<h2>".&mt('Sorry ...')."</h2>\n".
282: &mt('This resource might be part of'));
283: if ($ENV{'request.course.id'}) {
284: $r->print(&mt(' another'));
285: } else {
286: $r->print(&mt(' a certain'));
287: }
288: $r->print(&mt(' course.').'</body></html>');
289: return OK;
290: }
291: } else {
292: if ($advanced) {
293: $r->print(&mt("Your home server is ").
294: $Apache::lonnet::hostname{&Apache::lonnet::homeserver
295: ($ENV{'user.name'},$ENV{'user.domain'})}.
296: "<br />\n");
297: $r->print(&mt(
298: "Author and Co-Author roles may not be available on servers other than your home server."));
299: }
300: if (($ENV{'REDIRECT_QUERY_STRING'}) && ($fn)) {
301: $fn.='?'.$ENV{'REDIRECT_QUERY_STRING'};
302: }
303: $r->print('<form method="post" name="rolechoice" action="'.(($fn)?$fn:$r->uri).'">');
304: $r->print('<input type=hidden name=orgurl value="'.$fn.'">');
305: $r->print('<input type=hidden name=selectrole value=1>');
306: }
307: if ($ENV{'user.adv'}) {
308: $r->print(
309: '<br />'.&mt('Show all roles').': <input type="checkbox" name="showall"');
310: if ($ENV{'form.showall'}) { $r->print(' checked'); }
311: $r->print('><input type=submit value="'.&mt('Display').'">');
312: }
313:
314: my (%roletext,%sortrole,%roleclass);
315: my $countactive=0;
316: my $inrole=0;
317: my $possiblerole='';
318: foreach $envkey (sort keys %ENV) {
319: my $button = 1;
320: my $switchserver='';
321: my $roletext;
322: my $sortkey;
323: if ($envkey=~/^user\.role\./) {
324: my (undef,undef,$role,@pwhere)=split(/\./,$envkey);
325: next if (!defined($role) || $role eq '');
326: my $where=join('.',@pwhere);
327: my $trolecode=$role.'.'.$where;
328: my ($tstart,$tend)=split(/\./,$ENV{$envkey});
329: my $tremark='';
330: my $tstatus='is';
331: my $tpstart=' ';
332: my $tpend=' ';
333: my $tfont='#000000';
334: if ($tstart) {
335: if ($tstart>$then) {
336: $tstatus='future';
337: if ($tstart<$now) { $tstatus='will'; }
338: }
339: $tpstart=&Apache::lonlocal::locallocaltime($tstart);
340: }
341: if ($tend) {
342: if ($tend<$then) {
343: $tstatus='expired';
344: } elsif ($tend<$now) {
345: $tstatus='will_not';
346: }
347: $tpend=&Apache::lonlocal::locallocaltime($tend);
348: }
349: if ($ENV{'request.role'} eq $trolecode) {
350: $tstatus='selected';
351: }
352: my $tbg;
353: if (($tstatus eq 'is') || ($tstatus eq 'selected') ||
354: ($ENV{'form.showall'})) {
355: if ($tstatus eq 'is') {
356: $tbg='#77FF77';
357: $tfont='#003300';
358: $possiblerole=$trolecode;
359: $countactive++;
360: } elsif ($tstatus eq 'future') {
361: $tbg='#FFFF77';
362: $button=0;
363: } elsif ($tstatus eq 'will') {
364: $tbg='#FFAA77';
365: $tremark.=&mt('Active at next login. ');
366: } elsif ($tstatus eq 'expired') {
367: $tbg='#FF7777';
368: $tfont='#330000';
369: $button=0;
370: } elsif ($tstatus eq 'will_not') {
371: $tbg='#AAFF77';
372: $tremark.=&mt('Expired after logout. ');
373: } elsif ($tstatus eq 'selected') {
374: $tbg='#11CC55';
375: $tfont='#002200';
376: $inrole=1;
377: $countactive++;
378: $tremark.=&mt('Currently selected. ');
379: }
380: my $trole;
381: if ($role =~ /^cr\//) {
382: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$role);
383: $tremark.='<br>'.&mt('Defined by ').$rauthor.
384: &mt(' at ').$rdomain.'.';
385: $trole=$rrole;
386: } else {
387: $trole=Apache::lonnet::plaintext($role);
388: }
389: my $ttype;
390: my $twhere;
391: my ($tdom,$trest,$tsection)=
392: split(/\//,Apache::lonnet::declutter($where));
393: # First, Co-Authorship roles
394: if ($role eq 'ca') {
395: my $home = &Apache::lonnet::homeserver($trest,$tdom);
396: my $allowed=0;
397: my @ids=&Apache::lonnet::current_machine_ids();
398: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
399: if (!$allowed) {
400: $button=0;
401: $switchserver=&Apache::lonnet::escape('http://'.
402: $Apache::lonnet::hostname{$home}.
403: '/adm/login?domain='.$ENV{'user.domain'}.
404: '&username='.$ENV{'user.name'}.
405: '&firsturl=/priv/'.$trest);
406: }
407: #next if ($home eq 'no_host');
408: $home = $Apache::lonnet::hostname{$home};
409: $ttype='Construction Space';
410: $twhere=&mt('User').': '.$trest.'<br />'.&mt('Domain').
411: ': '.$tdom.'<br />'.
412: ' '.&mt('Server').': '.$home;
413: $ENV{'course.'.$tdom.'_'.$trest.'.description'}='ca';
414: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$trest.'/');
415: $sortkey=$role."$trest:$tdom";
416: } elsif ($role eq 'au') {
417: # Authors
418: my $home = &Apache::lonnet::homeserver
419: ($ENV{'user.name'},$ENV{'user.domain'});
420: my $allowed=0;
421: my @ids=&Apache::lonnet::current_machine_ids();
422: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
423: if (!$allowed) {
424: $button=0;
425: $switchserver=&Apache::lonnet::escape('http://'.
426: $Apache::lonnet::hostname{$home}.
427: '/adm/login?domain='.$ENV{'user.domain'}.
428: '&username='.$ENV{'user.name'}.
429: '&firsturl=/priv/'.$ENV{'user.name'});
430: }
431: #next if ($home eq 'no_host');
432: $home = $Apache::lonnet::hostname{$home};
433: $ttype='Construction Space';
434: $twhere=&mt('Domain').': '.$tdom.'<br />'.&mt('Server').
435: ': '.$home;
436: $ENV{'course.'.$tdom.'_'.$trest.'.description'}='ca';
437: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$ENV{'user.name'}.'/');
438: $sortkey=$role;
439: } elsif ($trest) {
440: $ttype='Course';
441: if ($tsection) {
442: $ttype.='<br>'.&mt('Section/Group').': '.$tsection;
443: }
444: my $tcourseid=$tdom.'_'.$trest;
445: if ($ENV{'course.'.$tcourseid.'.description'}) {
446: $twhere=$ENV{'course.'.$tcourseid.'.description'};
447: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
448: unless ($twhere eq &mt('Currently not available')) {
449: $twhere.=' <font size="-2">'.
450: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom,$tfont).
451: '</font>';
452: }
453: } else {
454: my %newhash=Apache::lonnet::coursedescription
455: ($tcourseid);
456: if (%newhash) {
457: $sortkey=$role."\0".$tdom."\0".$newhash{'description'}.
458: "\0".$envkey;
459: $twhere=$newhash{'description'}.
460: ' <font size="-2">'.
461: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom,$tfont).
462: '</font>';
463: } else {
464: $twhere=&mt('Currently not available');
465: $ENV{'course.'.$tcourseid.'.description'}=$twhere;
466: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
467: }
468: }
469: if ($role ne 'st') { $twhere.="<br />".&mt('Domain').":".$tdom; }
470: } elsif ($tdom) {
471: $ttype='Domain';
472: $twhere=$tdom;
473: $sortkey=$role.$twhere;
474: } else {
475: $ttype='System';
476: $twhere=&mt('system wide');
477: $sortkey=$role.$twhere;
478: }
479:
480: $roletext.='<tr bgcolor='.$tbg.'>';
481: unless ($nochoose) {
482: if (!$button) {
483: if ($switchserver) {
484: $roletext.='<td><a href="/adm/logout?handover='.
485: $switchserver.'">'.&mt('Switch Server').'</a></td>';
486: } else {
487: $roletext.=('<td> </td>');
488: }
489: } elsif ($tstatus eq 'is') {
490: $roletext.=('<td><input type=submit value="'.
491: &mt('Select').'" name="'.
492: $trolecode.'"></td>');
493: } elsif ($tryagain) {
494: $roletext.=
495: '<td><input type=submit value="'.
496: &mt('Try Selecting Again').'" name="'.$trolecode.'"></td>';
497: } elsif ($advanced) {
498: $roletext.=
499: '<td><input type=submit value="'.
500: &mt('Re-Initialize').'" name="'.$trolecode.'"></td>';
501: } else {
502: $roletext.='<td> </td>';
503: }
504: }
505: $tremark.=&Apache::lonannounce::showday(time,1,
506: &Apache::lonannounce::readcalendar($tdom.'_'.$trest));
507:
508: $roletext.='<td><font color="'.$tfont.'">'.$trole.
509: '</font></td><td><font color="'.$tfont.'">'.$ttype.
510: '</font></td><td><font color="'.$tfont.'">'.$twhere.
511: '</font></td><td><font color="'.$tfont.'">'.$tpstart.
512: '</font></td><td><font color="'.$tfont.'">'.$tpend.
513: '</font></td><td><font color="'.$tfont.'">'.$tremark.
514: ' </font></td></tr>'."\n";
515: $roletext{$envkey}=$roletext;
516: if (!$sortkey) {$sortkey=$twhere."\0".$envkey;}
517: $sortrole{$sortkey}=$envkey;
518: $roleclass{$envkey}=$ttype;
519: }
520: }
521: }
522: # No active roles
523: if ($countactive==0) {
524: if ($inrole) {
525: $r->print('<h2>'.&mt('Currently no additional roles or courses').'</h2>');
526: } else {
527: $r->print('<h2>'.&mt('Currently no active roles or courses').'</h2>');
528: }
529: $r->print('</form></body></html>');
530: return OK;
531: # Is there only one choice?
532: } elsif ($countactive==1) {
533: $r->print('<h3>'.&mt('Please stand by.').'</h3>'.
534: '<input type="hidden" name="'.$possiblerole.'" value="1" />');
535: $r->print("</form>\n");
536: $r->rflush();
537: $r->print('<script>document.forms.rolechoice.submit();</script>');
538: $r->print('</body></html>');
539: return OK;
540: }
541: # More than one possible role
542: # ----------------------------------------------------------------------- Table
543: unless (($advanced) || ($nochoose)) {
544: $r->print("<h2>".&mt('Select a Course to Enter')."</h2>\n");
545: }
546: $r->print('<br /><table><tr>');
547: unless ($nochoose) { $r->print('<th> </th>'); }
548: $r->print('<th>'.&mt('User Role').'</th><th colspan=2>'.&mt('Extent').
549: '</th><th>'.&mt('Start').'</th><th>'.&mt('End').'</th><th>'.
550: &mt('Remark').'</th></tr>'."\n");
551: my $doheaders=-1;
552: foreach my $type ('Construction Space','Course','Domain','System') {
553: my $haverole=0;
554: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%sortrole))) {
555: if ($roleclass{$sortrole{$which}} =~ /^\Q$type\E/) {
556: $haverole=1;
557: }
558: }
559: if ($haverole) { $doheaders++; }
560: }
561: foreach my $type ('Construction Space','Course','Domain','System') {
562: my $output;
563: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%sortrole))) {
564: if ($roleclass{$sortrole{$which}} =~ /^\Q$type\E/) {
565: $output.=&mt($roletext{$sortrole{$which}});
566: }
567: }
568: if ($output) {
569: if ($doheaders > 0) {
570: $r->print("<tr bgcolor='#BBffBB'>".
571: "<td align='center' colspan='7'>".&mt($type)."</td>");
572: }
573: $r->print($output);
574: }
575: }
576: my $tremark='';
577: my $tfont='#003300';
578: if ($ENV{'request.role'} eq 'cm') {
579: $r->print('<tr bgcolor="#11CC55">');
580: $tremark=&mt('Currently selected. ');
581: $tfont='#002200';
582: } else {
583: $r->print('<tr bgcolor="#77FF77">');
584: }
585: unless ($nochoose) {
586: if ($ENV{'request.role'} ne 'cm') {
587: $r->print('<td><input type=submit value="'.
588: &mt('Select').'" name="cm"></td>');
589: } else {
590: $r->print('<td> </td>');
591: }
592: }
593: $r->print('<td colspan=5><font color="'.$tfont.'">'.&mt('No role specified').
594: '</font></td><td><font color="'.$tfont.'">'.$tremark.
595: ' </font></td></tr>'."\n");
596:
597: $r->print('</table>');
598: unless ($nochoose) {
599: $r->print("</form>\n");
600: }
601: # ------------------------------------------------------------ Privileges Info
602: if (($advanced) && (($ENV{'user.error.msg'}) || ($error))) {
603: $r->print('<hr><h2>Current Privileges</h2>');
604:
605: foreach $envkey (sort keys %ENV) {
606: if ($envkey=~/^user\.priv\.$ENV{'request.role'}\./) {
607: my $where=$envkey;
608: $where=~s/^user\.priv\.$ENV{'request.role'}\.//;
609: my $ttype;
610: my $twhere;
611: my ($tdom,$trest,$tsec)=
612: split(/\//,Apache::lonnet::declutter($where));
613: if ($trest) {
614: if ($ENV{'course.'.$tdom.'_'.$trest.'.description'} eq 'ca') {
615: $ttype='Construction Space';
616: $twhere='User: '.$trest.', Domain: '.$tdom;
617: } else {
618: $ttype='Course';
619: $twhere=$ENV{'course.'.$tdom.'_'.$trest.'.description'};
620: if ($tsec) {
621: $twhere.=' (Section/Group: '.$tsec.')';
622: }
623: }
624: } elsif ($tdom) {
625: $ttype='Domain';
626: $twhere=$tdom;
627: } else {
628: $ttype='System';
629: $twhere='/';
630: }
631: $r->print("\n<h3>".$ttype.': '.$twhere.'</h3><ul>');
632: foreach (sort split(/:/,$ENV{$envkey})) {
633: if ($_) {
634: my ($prv,$restr)=split(/\&/,$_);
635: my $trestr='';
636: if ($restr ne 'F') {
637: my $i;
638: $trestr.=' (';
639: for ($i=0;$i<length($restr);$i++) {
640: $trestr.=
641: Apache::lonnet::plaintext(substr($restr,$i,1));
642: if ($i<length($restr)-1) { $trestr.=', '; }
643: }
644: $trestr.=')';
645: }
646: $r->print('<li>'.
647: Apache::lonnet::plaintext($prv).$trestr.
648: '</li>');
649: }
650: }
651: $r->print('</ul>');
652: }
653: }
654: }
655: $r->print(&Apache::lonnet::getannounce());
656: if ($advanced) {
657: $r->print('<p><small><i>This is LON-CAPA '.
658: $r->dir_config('lonVersion').'</i><br />'.
659: '<a href="/adm/logout">'.&mt('Logout').'</a></small></p>');
660: }
661: $r->print("</body></html>\n");
662: return OK;
663: }
664:
665: 1;
666: __END__
667:
668: =head1 NAME
669:
670: Apache::lonroles - User Roles Screen
671:
672: =head1 SYNOPSIS
673:
674: Invoked by /etc/httpd/conf/srm.conf:
675:
676: <Location /adm/roles>
677: PerlAccessHandler Apache::lonacc
678: SetHandler perl-script
679: PerlHandler Apache::lonroles
680: ErrorDocument 403 /adm/login
681: ErrorDocument 500 /adm/errorhandler
682: </Location>
683:
684: =head1 OVERVIEW
685:
686: =head2 Choosing Roles
687:
688: C<lonroles> is a handler that allows a user to switch roles in
689: mid-session. LON-CAPA attempts to work with "No Role Specified", the
690: default role that a user has before selecting a role, as widely as
691: possible, but certain handlers for example need specification which
692: course they should act on, etc. Both in this scenario, and when the
693: handler determines via C<lonnet>'s C<&allowed> function that a certain
694: action is not allowed, C<lonroles> is used as error handler. This
695: allows the user to select another role which may have permission to do
696: what they were trying to do. C<lonroles> can also be accessed via the
697: B<CRS> button in the Remote Control.
698:
699: =begin latex
700:
701: \begin{figure}
702: \begin{center}
703: \includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen}
704: \caption{\label{Sample_Roles_Screen}Sample Roles Screen}
705: \end{center}
706: \end{figure}
707:
708: =end latex
709:
710: =head2 Role Initialization
711:
712: 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.
713:
714: =head1 INTRODUCTION
715:
716: This module enables a user to select what role he wishes to
717: operate under (instructor, student, teaching assistant, course
718: coordinator, etc). These roles are pre-established by the actions
719: of upper-level users.
720:
721: This is part of the LearningOnline Network with CAPA project
722: described at http://www.lon-capa.org.
723:
724: =head1 HANDLER SUBROUTINE
725:
726: This routine is called by Apache and mod_perl.
727:
728: =over 4
729:
730: =item *
731:
732: Roles Initialization (yes/no)
733:
734: =item *
735:
736: Get Error Message from Environment
737:
738: =item *
739:
740: Who is this?
741:
742: =item *
743:
744: Generate Page Output
745:
746: =item *
747:
748: Choice or no choice
749:
750: =item *
751:
752: Table
753:
754: =item *
755:
756: Privileges
757:
758: =back
759:
760: =cut
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