1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.134 2014/04/30 21:51:30 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(/___/,$destsymb);
106: unless ($desturl=~/^(adm|editupload|public)/) {
107: $desturl = &Apache::lonnet::clutter($desturl);
108: }
109: $desturl = &HTML::Entities::encode($desturl,'"<>&');
110: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
111: $destination .= 'destinationurl='.$desturl.
112: '&destsymb='.$destsymb;
113: } else {
114: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
115: $destination .= 'destinationurl='.$destsymb;
116: }
117: }
118: if ($destination =~ m{^/adm/roles}) {
119: $destination .= ($destination =~ /\?/) ? '&' : '?';
120: $destination .= 'source=login';
121: }
122:
123: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
124: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
125: my $brcrum = [{'href' => '',
126: 'text' => 'Successful Login'},];
127: my $start_page=&Apache::loncommon::start_page('Successful Login',
128: $header,
129: {'bread_crumbs' => $brcrum,});
130: my $end_page =&Apache::loncommon::end_page();
131:
132: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
133: # ------------------------------------------------- Output for successful login
134:
135: &Apache::loncommon::content_type($r,'text/html');
136: $r->header_out('Set-cookie' => $cookie);
137: $r->send_http_header;
138:
139: my %lt=&Apache::lonlocal::texthash(
140: 'wel' => 'Welcome',
141: 'pro' => 'Login problems?',
142: );
143: my $loginhelp = &loginhelpdisplay($domain);
144: if ($loginhelp) {
145: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
146: }
147:
148: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
149: $r->print(<<ENDSUCCESS);
150: $start_page
151: $windowinfo
152: <h1>$lt{'wel'}</h1>
153: $welcome
154: $loginhelp
155: $continuelink
156: $end_page
157: ENDSUCCESS
158: return;
159: }
160:
161: # --------------------------------------------------------------- Failed login!
162:
163: sub failed {
164: my ($r,$message,$form) = @_;
165: (undef,undef,undef,my $clientmathml,my $clientunicode) =
166: &Apache::loncommon::decode_user_agent();
167: my $args = {};
168: if ($clientunicode && !$clientmathml) {
169: $args = {'browser.unicode' => 1};
170: }
171:
172: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
173: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
174: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
175: if (&Apache::lonnet::domain($udom,'description') eq '') {
176: undef($udom);
177: }
178: my $retry = '/adm/login';
179: if ($uname eq $form->{'uname'}) {
180: $retry .= '?username='.$uname;
181: }
182: if ($udom) {
183: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
184: }
185: if (exists($form->{role})) {
186: my $role = &Apache::loncommon::cleanup_html($form->{role});
187: if ($role ne '') {
188: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
189: }
190: }
191: if (exists($form->{symb})) {
192: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
193: if ($symb ne '') {
194: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
195: }
196: }
197: my $end_page = &Apache::loncommon::end_page();
198: &Apache::loncommon::content_type($r,'text/html');
199: $r->send_http_header;
200: my @actions =
201: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
202: my $loginhelp = &loginhelpdisplay($udom);
203: if ($loginhelp) {
204: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
205: }
206: #FIXME: link to helpdesk might be added here
207:
208: $r->print(
209: $start_page
210: .'<h2>'.&mt('Sorry ...').'</h2>'
211: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
212: .&Apache::lonhtmlcommon::actionbox(\@actions)
213: .$end_page
214: );
215: }
216:
217: # ------------------------------------------------------------------ Rerouting!
218:
219: sub reroute {
220: my ($r) = @_;
221: &Apache::loncommon::content_type($r,'text/html');
222: $r->send_http_header;
223: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
224: .&mt('Please [_1]log in again[_2].');
225: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
226: }
227:
228: # ---------------------------------------------------------------- Main handler
229:
230: sub handler {
231: my $r = shift;
232: my $londocroot = $r->dir_config('lonDocRoot');
233: my $form;
234: # Are we re-routing?
235: if (-e "$londocroot/lon-status/reroute.txt") {
236: &reroute($r);
237: return OK;
238: }
239:
240: &Apache::lonlocal::get_language_handle($r);
241:
242: # -------------------------------- Prevent users from attempting to login twice
243: my $handle = &Apache::lonnet::check_for_valid_session($r);
244: if ($handle ne '') {
245: my $lonidsdir=$r->dir_config('lonIDsDir');
246: if ($handle=~/^publicuser\_/) {
247: # For "public user" - remove it, we apparently really want to login
248: unlink($r->dir_config('lonIDsDir')."/$handle.id");
249: } else {
250: # Indeed, a valid token is found
251: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
252: &Apache::loncommon::content_type($r,'text/html');
253: $r->send_http_header;
254: my $start_page =
255: &Apache::loncommon::start_page('Already logged in');
256: my $end_page =
257: &Apache::loncommon::end_page();
258: my $dest = '/adm/roles';
259: if ($env{'form.firsturl'} ne '') {
260: $dest = $env{'form.firsturl'};
261: }
262: $r->print(
263: $start_page
264: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
265: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
266: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
267: .'</p>'
268: .$end_page
269: );
270: return OK;
271: }
272: }
273:
274: # ---------------------------------------------------- No valid token, continue
275:
276:
277: my $buffer;
278: if ($r->header_in('Content-length') > 0) {
279: $r->read($buffer,$r->header_in('Content-length'),0);
280: }
281: my %form;
282: foreach my $pair (split(/&/,$buffer)) {
283: my ($name,$value) = split(/=/,$pair);
284: $value =~ tr/+/ /;
285: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
286: $form{$name}=$value;
287: }
288:
289: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
290: &failed($r,'Username, password and domain need to be specified.',
291: \%form);
292: return OK;
293: }
294:
295: # split user logging in and "su"-user
296:
297: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
298: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
299: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
300: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
301:
302: my $role = $r->dir_config('lonRole');
303: my $domain = $r->dir_config('lonDefDomain');
304: my $prodir = $r->dir_config('lonUsersDir');
305: my $contact_name = &mt('LON-CAPA helpdesk');
306:
307: # ---------------------------------------- Get the information from login token
308:
309: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
310: $form{'serverid'});
311:
312: my %sessiondata;
313: if ($form{'iptoken'}) {
314: %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
315: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
316: }
317:
318: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
319: ($tmpinfo eq 'no_such_host')) {
320: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
321: return OK;
322: } else {
323: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
324: $form{'serverid'});
325: if ( $reply ne 'ok' ) {
326: &failed($r,'Session could not be opened.',\%form);
327: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
328: return OK;
329: }
330: }
331:
332: if (!&Apache::lonnet::domain($form{'udom'})) {
333: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
334: return OK;
335: }
336:
337: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
338: if ($rolestr) {
339: $rolestr = &unescape($rolestr);
340: }
341: if ($symbstr) {
342: $symbstr= &unescape($symbstr);
343: }
344: if ($rolestr =~ /^role=/) {
345: (undef,$form{'role'}) = split('=',$rolestr);
346: }
347: if ($symbstr =~ /^symb=/) {
348: (undef,$form{'symb'}) = split('=',$symbstr);
349: }
350:
351: my $keybin=pack("H16",$key);
352:
353: my $cipher;
354: if ($Crypt::DES::VERSION>=2.03) {
355: $cipher=new Crypt::DES $keybin;
356: }
357: else {
358: $cipher=new DES $keybin;
359: }
360: my $upass='';
361: for (my $i=0;$i<=2;$i++) {
362: my $chunk=
363: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
364:
365: $chunk.=
366: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
367:
368: $chunk=substr($chunk,1,ord(substr($chunk,0,1)));
369: $upass.=$chunk;
370: }
371:
372: # ---------------------------------------------------------------- Authenticate
373:
374: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
375: my ($cancreate,$statustocreate) =
376: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
377: my $defaultauth;
378: if (ref($cancreate) eq 'ARRAY') {
379: if (grep(/^login$/,@{$cancreate})) {
380: $defaultauth = 1;
381: }
382: }
383: my $clientcancheckhost = 1;
384: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
385: $form{'udom'},$defaultauth,
386: $clientcancheckhost);
387:
388: # --------------------------------------------------------------------- Failed?
389:
390: if ($authhost eq 'no_host') {
391: &failed($r,'Username and/or password could not be authenticated.',
392: \%form);
393: return OK;
394: } elsif ($authhost eq 'no_account_on_host') {
395: if ($defaultauth) {
396: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
397: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
398: return OK;
399: }
400: my $start_page =
401: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
402: my $lonhost = $r->dir_config('lonHostID');
403: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
404: my $contacts =
405: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
406: $form{'udom'},$origmail);
407: my ($contact_email) = split(',',$contacts);
408: my $output =
409: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
410: $domdesc,'',$lonhost,
411: $contact_email,$contact_name,
412: undef,$statustocreate);
413: &Apache::loncommon::content_type($r,'text/html');
414: $r->send_http_header;
415: &Apache::createaccount::print_header($r,$start_page);
416: $r->print('<h3>'.&mt('Account creation').'</h3>'.
417: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
418: $output.&Apache::loncommon::end_page());
419: return OK;
420: } else {
421: &failed($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);
422: return OK;
423: }
424: }
425:
426: if (($firsturl eq '') ||
427: ($firsturl=~/^\/adm\/(logout|remote)/)) {
428: $firsturl='/adm/roles';
429: }
430:
431: my $hosthere;
432: if ($form{'iptoken'}) {
433: if (($sessiondata{'domain'} eq $form{'udom'}) &&
434: ($sessiondata{'username'} eq $form{'uname'})) {
435: $hosthere = 1;
436: }
437: }
438:
439: # --------------------------------- Are we attempting to login as somebody else?
440: if ($form{'suname'}) {
441: # ------------ see if the original user has enough privileges to pull this stunt
442: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
443: # ---------------------------------------------------- see if the su-user exists
444: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
445: eq 'no_host') {
446: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
447: # ------------------------------ see if the su-user is not too highly privileged
448: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
449: # -------------------------------------------------------- actually switch users
450: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
451: ' logging in as '.$form{'suname'});
452: $form{'uname'}=$form{'suname'};
453: } else {
454: &Apache::lonnet::logthis('Attempted switch user to privileged user');
455: }
456: }
457: } else {
458: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
459: }
460: }
461:
462: my ($is_balancer,$otherserver);
463:
464: unless ($hosthere) {
465: ($is_balancer,$otherserver) =
466: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
467: }
468:
469: if ($is_balancer) {
470: if (!$otherserver) {
471: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
472: }
473: if ($otherserver) {
474: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
475: \%form);
476: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
477: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
478: $switchto .= '&origurl='.$firsturl;
479: }
480: if ($form{'role'}) {
481: $switchto .= '&role='.$form{'role'};
482: }
483: if ($form{'symb'}) {
484: $switchto .= '&symb='.$form{'symb'};
485: }
486: $r->internal_redirect($switchto);
487: } else {
488: $r->print(&noswitch());
489: }
490: return OK;
491: } else {
492: if (!&check_can_host($r,\%form,$authhost)) {
493: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
494: if ($otherserver) {
495: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
496: \%form);
497: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
498: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
499: $switchto .= '&origurl='.$firsturl;
500: }
501: if ($form{'role'}) {
502: $switchto .= '&role='.$form{'role'};
503: }
504: if ($form{'symb'}) {
505: $switchto .= '&symb='.$form{'symb'};
506: }
507: $r->internal_redirect($switchto);
508: } else {
509: $r->print(&noswitch());
510: }
511: return OK;
512: }
513:
514: # ------------------------------------------------------- Do the load balancing
515:
516: # ---------------------------------------------------------- Determine own load
517: my $loadlim = $r->dir_config('lonLoadLim');
518: my $loadavg;
519: {
520: my $loadfile=Apache::File->new('/proc/loadavg');
521: $loadavg=<$loadfile>;
522: }
523: $loadavg =~ s/\s.*//g;
524: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
525: my $userloadpercent=&Apache::lonnet::userload();
526:
527: # ---------------------------------------------------------- Are we overloaded?
528: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
529: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
530: if (!$unloaded) {
531: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
532: }
533: if ($unloaded) {
534: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
535: undef,\%form);
536: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
537: return OK;
538: }
539: }
540: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
541: \%form);
542: return OK;
543: }
544: }
545:
546: sub check_can_host {
547: my ($r,$form,$authhost,$domdesc) = @_;
548: return unless (ref($form) eq 'HASH');
549: my $canhost = 1;
550: my $lonhost = $r->dir_config('lonHostID');
551: my $udom = $form->{'udom'};
552: my @intdoms;
553: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
554: if (ref($internet_names) eq 'ARRAY') {
555: @intdoms = @{$internet_names};
556: }
557: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
558: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
559: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
560: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
561: my $hostname = &Apache::lonnet::hostname($lonhost);
562: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
563: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
564: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
565: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
566: my $loncaparev;
567: if ($authhost eq 'no_account_on_host') {
568: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
569: } else {
570: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
571: }
572: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
573: $udomdefaults{'remotesessions'},
574: $defdomdefaults{'hostedsessions'});
575: }
576: unless ($canhost) {
577: if ($authhost eq 'no_account_on_host') {
578: my $checkloginvia = 1;
579: my ($login_host,$hostname) =
580: &Apache::lonnet::choose_server($udom,$checkloginvia);
581: &Apache::loncommon::content_type($r,'text/html');
582: $r->send_http_header;
583: if ($login_host ne '') {
584: my $protocol = $Apache::lonnet::protocol{$login_host};
585: $protocol = 'http' if ($protocol ne 'https');
586: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
587: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
588: '<h3>'.&mt('Account creation').'</h3>'.
589: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
590: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
591: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
592: &Apache::loncommon::end_page());
593: } else {
594: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
595: '<h3>'.&mt('Account creation unavailable').'</h3>'.
596: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
597: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
598: &Apache::loncommon::end_page());
599: }
600: } else {
601: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
602: $form);
603: my ($otherserver) = &Apache::lonnet::choose_server($udom);
604: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
605: }
606: }
607: return $canhost;
608: }
609:
610: sub noswitch {
611: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
612: '<h3>'.&mt('Session unavailable').'</h3>'.
613: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
614: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
615: &Apache::loncommon::end_page();
616: return $result;
617: }
618:
619: sub loginhelpdisplay {
620: my ($authdomain) = @_;
621: my $login_help = 1;
622: my $lang = &Apache::lonlocal::current_language();
623: if ($login_help) {
624: my $dom = $authdomain;
625: if ($dom eq '') {
626: $dom = &Apache::lonnet::default_login_domain();
627: }
628: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
629: my $loginhelp_url;
630: if ($lang) {
631: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
632: if ($loginhelp_url ne '') {
633: return $loginhelp_url;
634: }
635: }
636: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
637: if ($loginhelp_url ne '') {
638: return $loginhelp_url;
639: } else {
640: return '/adm/loginproblems.html';
641: }
642: }
643: return;
644: }
645:
646: 1;
647: __END__
648:
649:
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