File:
[LON-CAPA] /
loncom /
auth /
lonroles.pm
Revision
1.83:
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Tue Jan 27 22:54:59 2004 UTC (20 years, 7 months ago) by
albertel
Branches:
MAIN
CVS tags:
HEAD
- supporting authors on multidomain machines
- this works, but requires that all users that author have unique usernames
( I.e. albertel@basement and albertel@annarbor will end up accessing the same /home/albertel/public_html)
- I plan on isntalling this on s17.lite.msu.edu to support the serway@brookscole user
1: # The LearningOnline Network with CAPA
2: # User Roles Screen
3: #
4: # $Id: lonroles.pm,v 1.83 2004/01/27 22:54:59 albertel 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: my $allowed=0;
408: my @ids=&Apache::lonnet::current_machine_ids();
409: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
410: if (!$allowed) {
411: $button=0;
412: $switchserver=&Apache::lonnet::escape('http://'.
413: $Apache::lonnet::hostname{$home}.
414: '/adm/login?domain='.$ENV{'user.domain'}.
415: '&username='.$ENV{'user.name'}.
416: '&firsturl=/priv/'.$trest);
417: }
418: #next if ($home eq 'no_host');
419: $home = $Apache::lonnet::hostname{$home};
420: $ttype='Construction Space';
421: $twhere=&mt('User').': '.$trest.'<br />'.&mt('Domain').
422: ': '.$tdom.'<br />'.
423: ' '.&mt('Server').': '.$home;
424: $ENV{'course.'.$tdom.'_'.$trest.'.description'}='ca';
425: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$trest.'/');
426: $sortkey=$role."$trest:$tdom";
427: } elsif ($role eq 'au') {
428: # Authors
429: my $home = &Apache::lonnet::homeserver
430: ($ENV{'user.name'},$ENV{'user.domain'});
431: my $allowed=0;
432: my @ids=&Apache::lonnet::current_machine_ids();
433: foreach my $id (@ids) { if ($id eq $home) { $allowed=1; } }
434: if (!$allowed) {
435: $button=0;
436: $switchserver=&Apache::lonnet::escape('http://'.
437: $Apache::lonnet::hostname{$home}.
438: '/adm/login?domain='.$ENV{'user.domain'}.
439: '&username='.$ENV{'user.name'}.
440: '&firsturl=/priv/'.$ENV{'user.name'});
441: }
442: #next if ($home eq 'no_host');
443: $home = $Apache::lonnet::hostname{$home};
444: $ttype='Construction Space';
445: $twhere=&mt('Domain').': '.$tdom.'<br />'.&mt('Server').
446: ': '.$home;
447: $ENV{'course.'.$tdom.'_'.$trest.'.description'}='ca';
448: $tremark.=&Apache::lonhtmlcommon::authorbombs('/res/'.$tdom.'/'.$ENV{'user.name'}.'/');
449: $sortkey=$role;
450: } elsif ($trest) {
451: $ttype='Course';
452: if ($tsection) {
453: $ttype.='<br>'.&mt('Section/Group').': '.$tsection;
454: }
455: my $tcourseid=$tdom.'_'.$trest;
456: if ($ENV{'course.'.$tcourseid.'.description'}) {
457: $twhere=$ENV{'course.'.$tcourseid.'.description'};
458: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
459: unless ($twhere eq &mt('Currently not available')) {
460: $twhere.=' <font size="-2">'.
461: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom,$tfont).
462: '</font>';
463: }
464: } else {
465: my %newhash=Apache::lonnet::coursedescription
466: ($tcourseid);
467: if (%newhash) {
468: $sortkey=$role."\0".$tdom."\0".$newhash{'description'}.
469: "\0".$envkey;
470: $twhere=$newhash{'description'}.
471: ' <font size="-2">'.
472: &Apache::loncommon::syllabuswrapper(&mt('Syllabus'),$trest,$tdom,$tfont).
473: '</font>';
474: } else {
475: $twhere=&mt('Currently not available');
476: $ENV{'course.'.$tcourseid.'.description'}=$twhere;
477: $sortkey=$role."\0".$tdom."\0".$twhere."\0".$envkey;
478: }
479: }
480: if ($role ne 'st') { $twhere.="<br />".&mt('Domain').":".$tdom; }
481: } elsif ($tdom) {
482: $ttype='Domain';
483: $twhere=$tdom;
484: $sortkey=$role.$twhere;
485: } else {
486: $ttype='System';
487: $twhere=&mt('system wide');
488: $sortkey=$role.$twhere;
489: }
490:
491: $roletext.='<tr bgcolor='.$tbg.'>';
492: unless ($nochoose) {
493: if (!$button) {
494: if ($switchserver) {
495: $roletext.='<td><a href="/adm/logout?handover='.
496: $switchserver.'">'.&mt('Switch Server').'</a></td>';
497: } else {
498: $roletext.=('<td> </td>');
499: }
500: } elsif ($tstatus eq 'is') {
501: $roletext.=('<td><input type=submit value="'.
502: &mt('Select').'" name="'.
503: $trolecode.'"></td>');
504: } elsif ($tryagain) {
505: $roletext.=
506: '<td><input type=submit value="'.
507: &mt('Try Selecting Again').'" name="'.$trolecode.'"></td>';
508: } elsif ($advanced) {
509: $roletext.=
510: '<td><input type=submit value="'.
511: &mt('Re-Initialize').'" name="'.$trolecode.'"></td>';
512: } else {
513: $roletext.='<td> </td>';
514: }
515: }
516: $tremark.=&Apache::lonannounce::showday(time,1,
517: &Apache::lonannounce::readcalendar($tdom.'_'.$trest));
518:
519: $roletext.='<td><font color="'.$tfont.'">'.$trole.
520: '</font></td><td><font color="'.$tfont.'">'.$ttype.
521: '</font></td><td><font color="'.$tfont.'">'.$twhere.
522: '</font></td><td><font color="'.$tfont.'">'.$tpstart.
523: '</font></td><td><font color="'.$tfont.'">'.$tpend.
524: '</font></td><td><font color="'.$tfont.'">'.$tremark.
525: ' </font></td></tr>'."\n";
526: $roletext{$envkey}=$roletext;
527: if (!$sortkey) {$sortkey=$twhere."\0".$envkey;}
528: $sortrole{$sortkey}=$envkey;
529: $roleclass{$envkey}=$ttype;
530: }
531: }
532: }
533: my $doheaders=-1;
534: foreach my $type ('Construction Space','Course','Domain','System') {
535: my $haverole=0;
536: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%sortrole))) {
537: if ($roleclass{$sortrole{$which}} =~ /^\Q$type\E/) {
538: $haverole=1;
539: }
540: }
541: if ($haverole) { $doheaders++; }
542: }
543: foreach my $type ('Construction Space','Course','Domain','System') {
544: my $output;
545: foreach my $which (sort {uc($a) cmp uc($b)} (keys(%sortrole))) {
546: if ($roleclass{$sortrole{$which}} =~ /^\Q$type\E/) {
547: $output.=&mt($roletext{$sortrole{$which}});
548: }
549: }
550: if ($output) {
551: if ($doheaders > 0) {
552: $r->print("<tr bgcolor='#BBffBB'>".
553: "<td align='center' colspan='7'>".&mt($type)."</td>");
554: }
555: $r->print($output);
556: }
557: }
558: my $tremark='';
559: my $tfont='#003300';
560: if ($ENV{'request.role'} eq 'cm') {
561: $r->print('<tr bgcolor="#11CC55">');
562: $tremark=&mt('Currently selected. ');
563: $tfont='#002200';
564: } else {
565: $r->print('<tr bgcolor="#77FF77">');
566: }
567: unless ($nochoose) {
568: if ($ENV{'request.role'} ne 'cm') {
569: $r->print('<td><input type=submit value="'.
570: &mt('Select').'" name="cm"></td>');
571: } else {
572: $r->print('<td> </td>');
573: }
574: }
575: $r->print('<td colspan=5><font color="'.$tfont.'">'.&mt('No role specified').
576: '</font></td><td><font color="'.$tfont.'">'.$tremark.
577: ' </font></td></tr>'."\n");
578:
579: $r->print('</table>');
580: unless ($nochoose) {
581: $r->print("</form>\n");
582: }
583: # ------------------------------------------------------------ Privileges Info
584: if (($advanced) && (($ENV{'user.error.msg'}) || ($error))) {
585: $r->print('<hr><h2>Current Privileges</h2>');
586:
587: foreach $envkey (sort keys %ENV) {
588: if ($envkey=~/^user\.priv\.$ENV{'request.role'}\./) {
589: my $where=$envkey;
590: $where=~s/^user\.priv\.$ENV{'request.role'}\.//;
591: my $ttype;
592: my $twhere;
593: my ($tdom,$trest,$tsec)=
594: split(/\//,Apache::lonnet::declutter($where));
595: if ($trest) {
596: if ($ENV{'course.'.$tdom.'_'.$trest.'.description'} eq 'ca') {
597: $ttype='Construction Space';
598: $twhere='User: '.$trest.', Domain: '.$tdom;
599: } else {
600: $ttype='Course';
601: $twhere=$ENV{'course.'.$tdom.'_'.$trest.'.description'};
602: if ($tsec) {
603: $twhere.=' (Section/Group: '.$tsec.')';
604: }
605: }
606: } elsif ($tdom) {
607: $ttype='Domain';
608: $twhere=$tdom;
609: } else {
610: $ttype='System';
611: $twhere='/';
612: }
613: $r->print("\n<h3>".$ttype.': '.$twhere.'</h3><ul>');
614: foreach (sort split(/:/,$ENV{$envkey})) {
615: if ($_) {
616: my ($prv,$restr)=split(/\&/,$_);
617: my $trestr='';
618: if ($restr ne 'F') {
619: my $i;
620: $trestr.=' (';
621: for ($i=0;$i<length($restr);$i++) {
622: $trestr.=
623: Apache::lonnet::plaintext(substr($restr,$i,1));
624: if ($i<length($restr)-1) { $trestr.=', '; }
625: }
626: $trestr.=')';
627: }
628: $r->print('<li>'.
629: Apache::lonnet::plaintext($prv).$trestr.
630: '</li>');
631: }
632: }
633: $r->print('</ul>');
634: }
635: }
636: }
637: $r->print(&Apache::lonnet::getannounce());
638: if ($advanced) {
639: $r->print('<p><small><i>This is LON-CAPA '.
640: $r->dir_config('lonVersion').'</i></small></p>');
641: }
642: $r->print("</body></html>\n");
643: return OK;
644: }
645:
646: 1;
647: __END__
648:
649: =head1 NAME
650:
651: Apache::lonroles - User Roles Screen
652:
653: =head1 SYNOPSIS
654:
655: Invoked by /etc/httpd/conf/srm.conf:
656:
657: <Location /adm/roles>
658: PerlAccessHandler Apache::lonacc
659: SetHandler perl-script
660: PerlHandler Apache::lonroles
661: ErrorDocument 403 /adm/login
662: ErrorDocument 500 /adm/errorhandler
663: </Location>
664:
665: =head1 OVERVIEW
666:
667: =head2 Choosing Roles
668:
669: C<lonroles> is a handler that allows a user to switch roles in
670: mid-session. LON-CAPA attempts to work with "No Role Specified", the
671: default role that a user has before selecting a role, as widely as
672: possible, but certain handlers for example need specification which
673: course they should act on, etc. Both in this scenario, and when the
674: handler determines via C<lonnet>'s C<&allowed> function that a certain
675: action is not allowed, C<lonroles> is used as error handler. This
676: allows the user to select another role which may have permission to do
677: what they were trying to do. C<lonroles> can also be accessed via the
678: B<CRS> button in the Remote Control.
679:
680: =begin latex
681:
682: \begin{figure}
683: \begin{center}
684: \includegraphics[width=0.45\paperwidth,keepaspectratio]{Sample_Roles_Screen}
685: \caption{\label{Sample_Roles_Screen}Sample Roles Screen}
686: \end{center}
687: \end{figure}
688:
689: =end latex
690:
691: =head2 Role Initialization
692:
693: 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.
694:
695: =head1 INTRODUCTION
696:
697: This module enables a user to select what role he wishes to
698: operate under (instructor, student, teaching assistant, course
699: coordinator, etc). These roles are pre-established by the actions
700: of upper-level users.
701:
702: This is part of the LearningOnline Network with CAPA project
703: described at http://www.lon-capa.org.
704:
705: =head1 HANDLER SUBROUTINE
706:
707: This routine is called by Apache and mod_perl.
708:
709: =over 4
710:
711: =item *
712:
713: Roles Initialization (yes/no)
714:
715: =item *
716:
717: Get Error Message from Environment
718:
719: =item *
720:
721: Who is this?
722:
723: =item *
724:
725: Generate Page Output
726:
727: =item *
728:
729: Choice or no choice
730:
731: =item *
732:
733: Table
734:
735: =item *
736:
737: Privileges
738:
739: =back
740:
741: =cut
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