1: # The LearningOnline Network
2: # User Authentication Module
3: #
4: # $Id: lonauth.pm,v 1.142 2017/02/17 14:34:21 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 qw(:DEFAULT :match);
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=/; HttpOnly";
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::lonhtmlcommon::scripttag('self.name="loncapaclient";');
122: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />';
123: my $brcrum = [{'href' => '',
124: 'text' => 'Successful Login'},];
125: my $args = {'bread_crumbs' => $brcrum,};
126: unless ((defined($form->{role})) || (defined($form->{symb}))) {
127: my $update=$env{'user.update.time'};
128: if (!$update) {
129: $update = $env{'user.login.time'};
130: }
131: my %roles_in_env;
132: my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
133: if ($showcount == 1) {
134: foreach my $rolecode (keys(%roles_in_env)) {
135: my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
136: if ($cid) {
137: my %coursedescription =
138: &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
139: if ($coursedescription{'type'} eq 'Placement') {
140: $args->{'crstype'} = 'Placement';
141: }
142: last;
143: }
144: }
145: }
146: }
147: my $start_page=&Apache::loncommon::start_page('Successful Login',
148: $header,$args);
149: my $end_page =&Apache::loncommon::end_page();
150:
151: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
152: # ------------------------------------------------- Output for successful login
153:
154: &Apache::loncommon::content_type($r,'text/html');
155: $r->header_out('Set-cookie' => $cookie);
156: $r->send_http_header;
157:
158: my %lt=&Apache::lonlocal::texthash(
159: 'wel' => 'Welcome',
160: 'pro' => 'Login problems?',
161: );
162: my $loginhelp = &loginhelpdisplay($domain);
163: if ($loginhelp) {
164: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
165: }
166:
167: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
168: $r->print(<<ENDSUCCESS);
169: $start_page
170: $windowinfo
171: <h1>$lt{'wel'}</h1>
172: $welcome
173: $loginhelp
174: $continuelink
175: $end_page
176: ENDSUCCESS
177: return;
178: }
179:
180: # --------------------------------------------------------------- Failed login!
181:
182: sub failed {
183: my ($r,$message,$form) = @_;
184: (undef,undef,undef,my $clientmathml,my $clientunicode) =
185: &Apache::loncommon::decode_user_agent();
186: my $args = {};
187: if ($clientunicode && !$clientmathml) {
188: $args = {'browser.unicode' => 1};
189: }
190:
191: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
192: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
193: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
194: if (&Apache::lonnet::domain($udom,'description') eq '') {
195: undef($udom);
196: }
197: my $retry = '/adm/login';
198: if ($uname eq $form->{'uname'}) {
199: $retry .= '?username='.$uname;
200: }
201: if ($udom) {
202: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
203: }
204: if (exists($form->{role})) {
205: my $role = &Apache::loncommon::cleanup_html($form->{role});
206: if ($role ne '') {
207: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
208: }
209: }
210: if (exists($form->{symb})) {
211: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
212: if ($symb ne '') {
213: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
214: }
215: }
216: my $end_page = &Apache::loncommon::end_page();
217: &Apache::loncommon::content_type($r,'text/html');
218: $r->send_http_header;
219: my @actions =
220: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
221: my $loginhelp = &loginhelpdisplay($udom);
222: if ($loginhelp) {
223: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
224: }
225: #FIXME: link to helpdesk might be added here
226:
227: $r->print(
228: $start_page
229: .'<h2>'.&mt('Sorry ...').'</h2>'
230: .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
231: .&Apache::lonhtmlcommon::actionbox(\@actions)
232: .$end_page
233: );
234: }
235:
236: # ------------------------------------------------------------------ Rerouting!
237:
238: sub reroute {
239: my ($r) = @_;
240: &Apache::loncommon::content_type($r,'text/html');
241: $r->send_http_header;
242: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
243: .&mt('Please [_1]log in again[_2].');
244: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
245: }
246:
247: # ---------------------------------------------------------------- Main handler
248:
249: sub handler {
250: my $r = shift;
251: my $londocroot = $r->dir_config('lonDocRoot');
252: # Are we re-routing?
253: if (-e "$londocroot/lon-status/reroute.txt") {
254: &reroute($r);
255: return OK;
256: }
257:
258: &Apache::lonlocal::get_language_handle($r);
259:
260: # -------------------------------- Prevent users from attempting to login twice
261: my $handle = &Apache::lonnet::check_for_valid_session($r);
262: if ($handle ne '') {
263: my $lonidsdir=$r->dir_config('lonIDsDir');
264: if ($handle=~/^publicuser\_/) {
265: # For "public user" - remove it, we apparently really want to login
266: unlink($r->dir_config('lonIDsDir')."/$handle.id");
267: } else {
268: # Indeed, a valid token is found
269: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
270: &Apache::loncommon::content_type($r,'text/html');
271: $r->send_http_header;
272: my $start_page =
273: &Apache::loncommon::start_page('Already logged in');
274: my $end_page =
275: &Apache::loncommon::end_page();
276: my $dest = '/adm/roles';
277: if ($env{'form.firsturl'} ne '') {
278: $dest = $env{'form.firsturl'};
279: }
280: $r->print(
281: $start_page
282: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
283: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
284: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
285: .'</p>'
286: .$end_page
287: );
288: return OK;
289: }
290: }
291:
292: # ---------------------------------------------------- No valid token, continue
293:
294:
295: my $buffer;
296: if ($r->header_in('Content-length') > 0) {
297: $r->read($buffer,$r->header_in('Content-length'),0);
298: }
299: my %form;
300: foreach my $pair (split(/&/,$buffer)) {
301: my ($name,$value) = split(/=/,$pair);
302: $value =~ tr/+/ /;
303: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
304: $form{$name}=$value;
305: }
306:
307: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
308: &failed($r,'Username, password and domain need to be specified.',
309: \%form);
310: return OK;
311: }
312:
313: # split user logging in and "su"-user
314:
315: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
316: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
317: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
318: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
319:
320: my $role = $r->dir_config('lonRole');
321: my $domain = $r->dir_config('lonDefDomain');
322: my $prodir = $r->dir_config('lonUsersDir');
323: my $contact_name = &mt('LON-CAPA helpdesk');
324:
325: # ---------------------------------------- Get the information from login token
326:
327: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
328: $form{'serverid'});
329:
330: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
331: ($tmpinfo eq 'no_such_host')) {
332: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
333: return OK;
334: } else {
335: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
336: $form{'serverid'});
337: if ( $reply ne 'ok' ) {
338: &failed($r,'Session could not be opened.',\%form);
339: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
340: return OK;
341: }
342: }
343:
344: if (!&Apache::lonnet::domain($form{'udom'})) {
345: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
346: return OK;
347: }
348:
349: my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
350: if ($rolestr) {
351: $rolestr = &unescape($rolestr);
352: }
353: if ($symbstr) {
354: $symbstr= &unescape($symbstr);
355: }
356: if ($iptokenstr) {
357: $iptokenstr = &unescape($iptokenstr);
358: }
359: if ($rolestr =~ /^role=/) {
360: (undef,$form{'role'}) = split('=',$rolestr);
361: }
362: if ($symbstr =~ /^symb=/) {
363: (undef,$form{'symb'}) = split('=',$symbstr);
364: }
365: if ($iptokenstr =~ /^iptoken=/) {
366: (undef,$form{'iptoken'}) = split('=',$iptokenstr);
367: }
368:
369: my $upass = $ENV{HTTPS} ? $form{'upass0'}
370: : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
371:
372: # ---------------------------------------------------------------- Authenticate
373:
374: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$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: my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
434: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
435: if (($sessiondata{'domain'} eq $form{'udom'}) &&
436: ($sessiondata{'username'} eq $form{'uname'})) {
437: $hosthere = 1;
438: }
439: }
440:
441: # --------------------------------- Are we attempting to login as somebody else?
442: if ($form{'suname'}) {
443: # ------------ see if the original user has enough privileges to pull this stunt
444: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
445: # ---------------------------------------------------- see if the su-user exists
446: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
447: eq 'no_host') {
448: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
449: # ------------------------------ see if the su-user is not too highly privileged
450: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
451: # -------------------------------------------------------- actually switch users
452: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
453: ' logging in as '.$form{'suname'});
454: $form{'uname'}=$form{'suname'};
455: } else {
456: &Apache::lonnet::logthis('Attempted switch user to privileged user');
457: }
458: }
459: } else {
460: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
461: }
462: }
463:
464: my ($is_balancer,$otherserver);
465:
466: unless ($hosthere) {
467: ($is_balancer,$otherserver) =
468: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
469: if ($is_balancer) {
470: if ($otherserver eq '') {
471: my $lowest_load;
472: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
473: if ($lowest_load > 100) {
474: $otherserver = &Apache::lonnet::spareserver($lowest_load,$lowest_load,1,$form{'udom'});
475: }
476: }
477: if ($otherserver ne '') {
478: my @hosts = &Apache::lonnet::current_machine_ids();
479: if (grep(/^\Q$otherserver\E$/,@hosts)) {
480: $hosthere = $otherserver;
481: }
482: }
483: }
484: }
485:
486: if (($is_balancer) && (!$hosthere)) {
487: if ($otherserver) {
488: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
489: \%form);
490: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
491: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
492: $switchto .= '&origurl='.$firsturl;
493: }
494: if ($form{'role'}) {
495: $switchto .= '&role='.$form{'role'};
496: }
497: if ($form{'symb'}) {
498: $switchto .= '&symb='.$form{'symb'};
499: }
500: $r->internal_redirect($switchto);
501: } else {
502: $r->print(&noswitch());
503: }
504: return OK;
505: } else {
506: if (!&check_can_host($r,\%form,$authhost)) {
507: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
508: if ($otherserver) {
509: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
510: \%form);
511: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
512: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
513: $switchto .= '&origurl='.$firsturl;
514: }
515: if ($form{'role'}) {
516: $switchto .= '&role='.$form{'role'};
517: }
518: if ($form{'symb'}) {
519: $switchto .= '&symb='.$form{'symb'};
520: }
521: $r->internal_redirect($switchto);
522: } else {
523: $r->print(&noswitch());
524: }
525: return OK;
526: }
527:
528: # ------------------------------------------------------- Do the load balancing
529:
530: # ---------------------------------------------------------- Determine own load
531: my $loadlim = $r->dir_config('lonLoadLim');
532: my $loadavg;
533: {
534: my $loadfile=Apache::File->new('/proc/loadavg');
535: $loadavg=<$loadfile>;
536: }
537: $loadavg =~ s/\s.*//g;
538: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
539: my $userloadpercent=&Apache::lonnet::userload();
540:
541: # ---------------------------------------------------------- Are we overloaded?
542: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
543: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
544: if (!$unloaded) {
545: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
546: }
547: if ($unloaded) {
548: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
549: undef,\%form);
550: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
551: return OK;
552: }
553: }
554: if (($is_balancer) && ($hosthere)) {
555: $form{'noloadbalance'} = $hosthere;
556: }
557: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
558: \%form);
559: return OK;
560: }
561: }
562:
563: sub check_can_host {
564: my ($r,$form,$authhost,$domdesc) = @_;
565: return unless (ref($form) eq 'HASH');
566: my $canhost = 1;
567: my $lonhost = $r->dir_config('lonHostID');
568: my $udom = $form->{'udom'};
569: my @intdoms;
570: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
571: if (ref($internet_names) eq 'ARRAY') {
572: @intdoms = @{$internet_names};
573: }
574: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
575: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
576: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
577: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
578: my $hostname = &Apache::lonnet::hostname($lonhost);
579: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
580: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
581: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
582: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
583: my $loncaparev;
584: if ($authhost eq 'no_account_on_host') {
585: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
586: } else {
587: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
588: }
589: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
590: $udomdefaults{'remotesessions'},
591: $defdomdefaults{'hostedsessions'});
592: }
593: unless ($canhost) {
594: if ($authhost eq 'no_account_on_host') {
595: my $checkloginvia = 1;
596: my ($login_host,$hostname) =
597: &Apache::lonnet::choose_server($udom,$checkloginvia);
598: &Apache::loncommon::content_type($r,'text/html');
599: $r->send_http_header;
600: if ($login_host ne '') {
601: my $protocol = $Apache::lonnet::protocol{$login_host};
602: $protocol = 'http' if ($protocol ne 'https');
603: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
604: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
605: '<h3>'.&mt('Account creation').'</h3>'.
606: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
607: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
608: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
609: &Apache::loncommon::end_page());
610: } else {
611: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
612: '<h3>'.&mt('Account creation unavailable').'</h3>'.
613: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
614: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
615: &Apache::loncommon::end_page());
616: }
617: } else {
618: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
619: $form);
620: my ($otherserver) = &Apache::lonnet::choose_server($udom);
621: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
622: }
623: }
624: return $canhost;
625: }
626:
627: sub noswitch {
628: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
629: '<h3>'.&mt('Session unavailable').'</h3>'.
630: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
631: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
632: &Apache::loncommon::end_page();
633: return $result;
634: }
635:
636: sub loginhelpdisplay {
637: my ($authdomain) = @_;
638: my $login_help = 1;
639: my $lang = &Apache::lonlocal::current_language();
640: if ($login_help) {
641: my $dom = $authdomain;
642: if ($dom eq '') {
643: $dom = &Apache::lonnet::default_login_domain();
644: }
645: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
646: my $loginhelp_url;
647: if ($lang) {
648: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
649: if ($loginhelp_url ne '') {
650: return $loginhelp_url;
651: }
652: }
653: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
654: if ($loginhelp_url ne '') {
655: return $loginhelp_url;
656: } else {
657: return '/adm/loginproblems.html';
658: }
659: }
660: return;
661: }
662:
663: 1;
664: __END__
665:
666:
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