1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.121.2.14 2016/08/11 09:24:13 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: package Apache::lonauth;
30:
31: use strict;
32: use LONCAPA;
33: use Apache::Constants qw(:common);
34: use CGI qw(:standard);
35: use DynaLoader; # for Crypt::DES version
36: use Crypt::DES;
37: use Apache::loncommon();
38: use Apache::lonnet;
39: use Apache::lonmenu();
40: use Apache::createaccount;
41: use Fcntl qw(:flock);
42: use Apache::lonlocal;
43: use Apache::File();
44: use HTML::Entities;
45:
46: # ------------------------------------------------------------ Successful login
47: sub success {
48: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
49: $form) = @_;
50:
51: # ------------------------------------------------------------ Get cookie ready
52: my $cookie =
53: &Apache::loncommon::init_user_environment($r, $username, $domain,
54: $authhost, $form,
55: {'extra_env' => $extra_env,});
56:
57: my $public=($username eq 'public' && $domain eq 'public');
58:
59: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
60:
61: # -------------------------------------------------------------------- Log this
62:
63: &Apache::lonnet::log($domain,$username,$authhost,
64: "Login $ENV{'REMOTE_ADDR'}");
65:
66: # ------------------------------------------------- Check for critical messages
67:
68: my @what=&Apache::lonnet::dump('critical',$domain,$username);
69: if ($what[0]) {
70: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
71: $lowerurl='/adm/email?critical=display';
72: }
73: }
74:
75: # ------------------------------------------------------------ Get cookie ready
76: $cookie="lonID=$cookie; path=/";
77: # -------------------------------------------------------- Menu script and info
78: my $destination = $lowerurl;
79:
80: if (defined($form->{role})) {
81: my $envkey = 'user.role.'.$form->{role};
82: my $now=time;
83: my $then=$env{'user.login.time'};
84: my $refresh=$env{'user.refresh.time'};
85: my $update=$env{'user.update.time'};
86: if (!$update) {
87: $update = $then;
88: }
89: if (exists($env{$envkey})) {
90: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
91: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
92: \$trolecode,\$tstatus,\$tstart,\$tend);
93: if ($tstatus eq 'is') {
94: $destination .= ($destination =~ /\?/) ? '&' : '?';
95: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
96: $destination .= 'selectrole=1&'.$newrole.'=1';
97: }
98: }
99: }
100: if (defined($form->{symb})) {
101: my $destsymb = $form->{symb};
102: $destination .= ($destination =~ /\?/) ? '&' : '?';
103: if ($destsymb =~ /___/) {
104: # FIXME Need to deal with encrypted symbs and urls as needed.
105: my ($map,$resid,$desturl)=split(/___/,$destsymb);
106: $desturl = &Apache::lonnet::clutter($desturl);
107: $desturl = &HTML::Entities::encode($desturl,'"<>&');
108: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
109: $destination .= 'destinationurl='.$desturl.
110: '&destsymb='.$destsymb;
111: } else {
112: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
113: $destination .= 'destinationurl='.$destsymb;
114: }
115: }
116: if ($destination =~ m{^/adm/roles}) {
117: $destination .= ($destination =~ /\?/) ? '&' : '?';
118: $destination .= 'source=login';
119: }
120:
121: my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
122: my $startupremote=&Apache::lonmenu::startupremote($destination);
123: my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
124: my $setflags=&Apache::lonmenu::setflags();
125: my $maincall=&Apache::lonmenu::maincall();
126: my $brcrum = [{'href' => '',
127: 'text' => 'Successful Login'},];
128: my $start_page=&Apache::loncommon::start_page('Successful Login',
129: $startupremote,
130: {'no_inline_link' => 1,
131: 'bread_crumbs' => $brcrum,});
132: my $end_page =&Apache::loncommon::end_page();
133:
134: my $continuelink;
135: if ($env{'environment.remote'} eq 'off') {
136: $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
137: }
138: # ------------------------------------------------- Output for successful login
139:
140: &Apache::loncommon::content_type($r,'text/html');
141: $r->header_out('Set-cookie' => $cookie);
142: $r->send_http_header;
143:
144: my %lt=&Apache::lonlocal::texthash(
145: 'wel' => 'Welcome',
146: 'pro' => 'Login problems?',
147: );
148: my $loginhelp = &loginhelpdisplay($domain);
149: if ($loginhelp) {
150: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
151: }
152:
153: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
154: $r->print(<<ENDSUCCESS);
155: $start_page
156: $setflags
157: $windowinfo
158: <h1>$lt{'wel'}</h1>
159: $welcome
160: $loginhelp
161: $remoteinfo
162: $maincall
163: $continuelink
164: $end_page
165: ENDSUCCESS
166: return;
167: }
168:
169: # --------------------------------------------------------------- Failed login!
170:
171: sub failed {
172: my ($r,$message,$form) = @_;
173: (undef,undef,undef,my $clientmathml,my $clientunicode) =
174: &Apache::loncommon::decode_user_agent();
175: my $args = {};
176: if ($clientunicode && !$clientmathml) {
177: $args = {'browser.unicode' => 1};
178: }
179:
180: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
181: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
182: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
183: if (&Apache::lonnet::domain($udom,'description') eq '') {
184: undef($udom);
185: }
186: my $retry = '/adm/login';
187: if ($uname eq $form->{'uname'}) {
188: $retry .= '?username='.$uname;
189: }
190: if ($udom) {
191: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
192: }
193: if (exists($form->{role})) {
194: my $role = &Apache::loncommon::cleanup_html($form->{role});
195: if ($role ne '') {
196: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
197: }
198: }
199: if (exists($form->{symb})) {
200: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
201: if ($symb ne '') {
202: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
203: }
204: }
205: my $end_page = &Apache::loncommon::end_page();
206: &Apache::loncommon::content_type($r,'text/html');
207: $r->send_http_header;
208: my @actions =
209: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
210: my $loginhelp = &loginhelpdisplay($udom);
211: if ($loginhelp) {
212: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
213: }
214: #FIXME: link to helpdesk might be added here
215:
216: $r->print(
217: $start_page
218: .'<h2>'.&mt('Sorry ...').'</h2>'
219: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
220: .&Apache::lonhtmlcommon::actionbox(\@actions)
221: .$end_page
222: );
223: }
224:
225: # ------------------------------------------------------------------ Rerouting!
226:
227: sub reroute {
228: my ($r) = @_;
229: &Apache::loncommon::content_type($r,'text/html');
230: $r->send_http_header;
231: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
232: .&mt('Please [_1]log in again[_2].');
233: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
234: }
235:
236: # ---------------------------------------------------------------- Main handler
237:
238: sub handler {
239: my $r = shift;
240: my $londocroot = $r->dir_config('lonDocRoot');
241: my $form;
242: # Are we re-routing?
243: if (-e "$londocroot/lon-status/reroute.txt") {
244: &reroute($r);
245: return OK;
246: }
247:
248: &Apache::lonlocal::get_language_handle($r);
249:
250: # -------------------------------- Prevent users from attempting to login twice
251: my $handle = &Apache::lonnet::check_for_valid_session($r);
252: if ($handle ne '') {
253: my $lonidsdir=$r->dir_config('lonIDsDir');
254: if ($handle=~/^publicuser\_/) {
255: # For "public user" - remove it, we apparently really want to login
256: unlink($r->dir_config('lonIDsDir')."/$handle.id");
257: } else {
258: # Indeed, a valid token is found
259: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
260: &Apache::loncommon::content_type($r,'text/html');
261: $r->send_http_header;
262: my $start_page =
263: &Apache::loncommon::start_page('Already logged in');
264: my $end_page =
265: &Apache::loncommon::end_page();
266: my $dest = '/adm/roles';
267: if ($env{'form.firsturl'} ne '') {
268: $dest = $env{'form.firsturl'};
269: }
270: $r->print(
271: $start_page
272: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
273: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
274: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
275: .'</p>'
276: .$end_page
277: );
278: return OK;
279: }
280: }
281:
282: # ---------------------------------------------------- No valid token, continue
283:
284:
285: my $buffer;
286: if ($r->header_in('Content-length') > 0) {
287: $r->read($buffer,$r->header_in('Content-length'),0);
288: }
289: my %form;
290: foreach my $pair (split(/&/,$buffer)) {
291: my ($name,$value) = split(/=/,$pair);
292: $value =~ tr/+/ /;
293: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
294: $form{$name}=$value;
295: }
296:
297: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
298: &failed($r,'Username, password and domain need to be specified.',
299: \%form);
300: return OK;
301: }
302:
303: # split user logging in and "su"-user
304:
305: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
306: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
307: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
308: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
309:
310: my $role = $r->dir_config('lonRole');
311: my $domain = $r->dir_config('lonDefDomain');
312: my $prodir = $r->dir_config('lonUsersDir');
313: my $contact_name = &mt('LON-CAPA helpdesk');
314:
315: # ---------------------------------------- Get the information from login token
316:
317: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
318: $form{'serverid'});
319:
320: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
321: ($tmpinfo eq 'no_such_host')) {
322: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
323: return OK;
324: } else {
325: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
326: $form{'serverid'});
327: if ( $reply ne 'ok' ) {
328: &failed($r,'Session could not be opened.',\%form);
329: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
330: return OK;
331: }
332: }
333:
334: if (!&Apache::lonnet::domain($form{'udom'})) {
335: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
336: return OK;
337: }
338:
339: my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
340: if ($rolestr) {
341: $rolestr = &unescape($rolestr);
342: }
343: if ($symbstr) {
344: $symbstr= &unescape($symbstr);
345: }
346: if ($iptokenstr) {
347: $iptokenstr = &unescape($iptokenstr);
348: }
349: if ($rolestr =~ /^role=/) {
350: (undef,$form{'role'}) = split('=',$rolestr);
351: }
352: if ($symbstr =~ /^symb=/) {
353: (undef,$form{'symb'}) = split('=',$symbstr);
354: }
355: if ($iptokenstr =~ /^iptoken=/) {
356: (undef,$form{'iptoken'}) = split('=',$iptokenstr);
357: }
358:
359: my $upass = &Apache::loncommon::des_decrypt($key,$form{'upass0'});
360:
361: # ---------------------------------------------------------------- Authenticate
362:
363: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
364: my ($cancreate,$statustocreate) =
365: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
366: my $defaultauth;
367: if (ref($cancreate) eq 'ARRAY') {
368: if (grep(/^login$/,@{$cancreate})) {
369: $defaultauth = 1;
370: }
371: }
372: my $clientcancheckhost = 1;
373: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
374: $form{'udom'},$defaultauth,
375: $clientcancheckhost);
376:
377: # --------------------------------------------------------------------- Failed?
378:
379: if ($authhost eq 'no_host') {
380: &failed($r,'Username and/or password could not be authenticated.',
381: \%form);
382: return OK;
383: } elsif ($authhost eq 'no_account_on_host') {
384: if ($defaultauth) {
385: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
386: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
387: return OK;
388: }
389: my $start_page =
390: &Apache::loncommon::start_page('Create a user account in LON-CAPA',
391: '',{'no_inline_link' => 1,});
392: my $lonhost = $r->dir_config('lonHostID');
393: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
394: my $contacts =
395: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
396: $form{'udom'},$origmail);
397: my ($contact_email) = split(',',$contacts);
398: my $output =
399: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
400: $domdesc,'',$lonhost,
401: $contact_email,$contact_name,
402: undef,$statustocreate);
403: &Apache::loncommon::content_type($r,'text/html');
404: $r->send_http_header;
405: &Apache::createaccount::print_header($r,$start_page);
406: $r->print('<h3>'.&mt('Account creation').'</h3>'.
407: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
408: $output.&Apache::loncommon::end_page());
409: return OK;
410: } else {
411: &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
412: return OK;
413: }
414: }
415:
416: if (($firsturl eq '') ||
417: ($firsturl=~/^\/adm\/(logout|remote)/)) {
418: $firsturl='/adm/roles';
419: }
420:
421: my $hosthere;
422: if ($form{'iptoken'}) {
423: my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
424: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
425: if (($sessiondata{'domain'} eq $form{'udom'}) &&
426: ($sessiondata{'username'} eq $form{'uname'})) {
427: $hosthere = 1;
428: }
429: }
430:
431: # --------------------------------- Are we attempting to login as somebody else?
432: if ($form{'suname'}) {
433: # ------------ see if the original user has enough privileges to pull this stunt
434: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
435: # ---------------------------------------------------- see if the su-user exists
436: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
437: eq 'no_host') {
438: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
439: # ------------------------------ see if the su-user is not too highly privileged
440: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
441: # -------------------------------------------------------- actually switch users
442: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
443: ' logging in as '.$form{'suname'});
444: $form{'uname'}=$form{'suname'};
445: } else {
446: &Apache::lonnet::logthis('Attempted switch user to privileged user');
447: }
448: }
449: } else {
450: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
451: }
452: }
453:
454: my ($is_balancer,$otherserver);
455:
456: unless ($hosthere) {
457: ($is_balancer,$otherserver) =
458: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
459: }
460:
461: if ($is_balancer) {
462: if (!$otherserver) {
463: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
464: }
465: if ($otherserver) {
466: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
467: \%form);
468: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
469: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
470: $switchto .= '&origurl='.$firsturl;
471: }
472: if ($form{'role'}) {
473: $switchto .= '&role='.$form{'role'};
474: }
475: if ($form{'symb'}) {
476: $switchto .= '&symb='.$form{'symb'};
477: }
478: $r->internal_redirect($switchto);
479: } else {
480: $r->print(&noswitch());
481: }
482: return OK;
483: } else {
484: if (!&check_can_host($r,\%form,$authhost)) {
485: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
486: if ($otherserver) {
487: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
488: \%form);
489: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
490: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
491: $switchto .= '&origurl='.$firsturl;
492: }
493: if ($form{'role'}) {
494: $switchto .= '&role='.$form{'role'};
495: }
496: if ($form{'symb'}) {
497: $switchto .= '&symb='.$form{'symb'};
498: }
499: $r->internal_redirect($switchto);
500: } else {
501: $r->print(&noswitch());
502: }
503: return OK;
504: }
505:
506: # ------------------------------------------------------- Do the load balancing
507:
508: # ---------------------------------------------------------- Determine own load
509: my $loadlim = $r->dir_config('lonLoadLim');
510: my $loadavg;
511: {
512: my $loadfile=Apache::File->new('/proc/loadavg');
513: $loadavg=<$loadfile>;
514: }
515: $loadavg =~ s/\s.*//g;
516: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
517: my $userloadpercent=&Apache::lonnet::userload();
518:
519: # ---------------------------------------------------------- Are we overloaded?
520: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
521: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
522: if (!$unloaded) {
523: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
524: }
525: if ($unloaded) {
526: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
527: undef,\%form);
528: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
529: return OK;
530: }
531: }
532: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
533: \%form);
534: return OK;
535: }
536: }
537:
538: sub check_can_host {
539: my ($r,$form,$authhost,$domdesc) = @_;
540: return unless (ref($form) eq 'HASH');
541: my $canhost = 1;
542: my $lonhost = $r->dir_config('lonHostID');
543: my $udom = $form->{'udom'};
544: my @intdoms;
545: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
546: if (ref($internet_names) eq 'ARRAY') {
547: @intdoms = @{$internet_names};
548: }
549: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
550: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
551: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
552: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
553: my $hostname = &Apache::lonnet::hostname($lonhost);
554: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
555: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
556: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
557: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
558: my $loncaparev;
559: if ($authhost eq 'no_account_on_host') {
560: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
561: } else {
562: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
563: }
564: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
565: $udomdefaults{'remotesessions'},
566: $defdomdefaults{'hostedsessions'});
567: }
568: unless ($canhost) {
569: if ($authhost eq 'no_account_on_host') {
570: my $checkloginvia = 1;
571: my ($login_host,$hostname) =
572: &Apache::lonnet::choose_server($udom,$checkloginvia);
573: &Apache::loncommon::content_type($r,'text/html');
574: $r->send_http_header;
575: if ($login_host ne '') {
576: my $protocol = $Apache::lonnet::protocol{$login_host};
577: $protocol = 'http' if ($protocol ne 'https');
578: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
579: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
580: '<h3>'.&mt('Account creation').'</h3>'.
581: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
582: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
583: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
584: &Apache::loncommon::end_page());
585: } else {
586: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
587: '<h3>'.&mt('Account creation unavailable').'</h3>'.
588: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
589: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
590: &Apache::loncommon::end_page());
591: }
592: } else {
593: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
594: $form);
595: my ($otherserver) = &Apache::lonnet::choose_server($udom);
596: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
597: }
598: }
599: return $canhost;
600: }
601:
602: sub noswitch {
603: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
604: '<h3>'.&mt('Session unavailable').'</h3>'.
605: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
606: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
607: &Apache::loncommon::end_page();
608: return $result;
609: }
610:
611: sub loginhelpdisplay {
612: my ($authdomain) = @_;
613: my $login_help = 1;
614: my $lang = &Apache::lonlocal::current_language();
615: if ($login_help) {
616: my $dom = $authdomain;
617: if ($dom eq '') {
618: $dom = &Apache::lonnet::default_login_domain();
619: }
620: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
621: my $loginhelp_url;
622: if ($lang) {
623: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
624: if ($loginhelp_url ne '') {
625: return $loginhelp_url;
626: }
627: }
628: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
629: if ($loginhelp_url ne '') {
630: return $loginhelp_url;
631: } else {
632: return '/adm/loginproblems.html';
633: }
634: }
635: return;
636: }
637:
638: 1;
639: __END__
640:
641:
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