Annotation of loncom/auth/lonauth.pm, revision 1.140
1.136 kruse 1: # The LearningOnline Network
2: # User Authentication Module
3: #
1.140 ! raeburn 4: # $Id: lonauth.pm,v 1.139 2016/02/17 19:15:40 raeburn Exp $
1.136 kruse 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;
1.140 ! raeburn 32: use LONCAPA qw(:DEFAULT :match);
1.136 kruse 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);
1.137 raeburn 106: $desturl = &Apache::lonnet::clutter($desturl);
1.136 kruse 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'},];
1.140 ! raeburn 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: }
1.136 kruse 147: my $start_page=&Apache::loncommon::start_page('Successful Login',
1.140 ! raeburn 148: $header,$args);
1.136 kruse 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: my $form;
253: # Are we re-routing?
254: if (-e "$londocroot/lon-status/reroute.txt") {
255: &reroute($r);
256: return OK;
257: }
258:
259: &Apache::lonlocal::get_language_handle($r);
260:
261: # -------------------------------- Prevent users from attempting to login twice
262: my $handle = &Apache::lonnet::check_for_valid_session($r);
263: if ($handle ne '') {
264: my $lonidsdir=$r->dir_config('lonIDsDir');
265: if ($handle=~/^publicuser\_/) {
266: # For "public user" - remove it, we apparently really want to login
267: unlink($r->dir_config('lonIDsDir')."/$handle.id");
268: } else {
269: # Indeed, a valid token is found
270: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
271: &Apache::loncommon::content_type($r,'text/html');
272: $r->send_http_header;
273: my $start_page =
274: &Apache::loncommon::start_page('Already logged in');
275: my $end_page =
276: &Apache::loncommon::end_page();
277: my $dest = '/adm/roles';
278: if ($env{'form.firsturl'} ne '') {
279: $dest = $env{'form.firsturl'};
280: }
281: $r->print(
282: $start_page
283: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
284: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
285: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
286: .'</p>'
287: .$end_page
288: );
289: return OK;
290: }
291: }
292:
293: # ---------------------------------------------------- No valid token, continue
294:
295:
296: my $buffer;
297: if ($r->header_in('Content-length') > 0) {
298: $r->read($buffer,$r->header_in('Content-length'),0);
299: }
300: my %form;
301: foreach my $pair (split(/&/,$buffer)) {
302: my ($name,$value) = split(/=/,$pair);
303: $value =~ tr/+/ /;
304: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
305: $form{$name}=$value;
306: }
307:
308: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
309: &failed($r,'Username, password and domain need to be specified.',
310: \%form);
311: return OK;
312: }
313:
314: # split user logging in and "su"-user
315:
316: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
317: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
318: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
319: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
320:
321: my $role = $r->dir_config('lonRole');
322: my $domain = $r->dir_config('lonDefDomain');
323: my $prodir = $r->dir_config('lonUsersDir');
324: my $contact_name = &mt('LON-CAPA helpdesk');
325:
326: # ---------------------------------------- Get the information from login token
327:
328: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
329: $form{'serverid'});
330:
331: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
332: ($tmpinfo eq 'no_such_host')) {
333: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
334: return OK;
335: } else {
336: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
337: $form{'serverid'});
338: if ( $reply ne 'ok' ) {
339: &failed($r,'Session could not be opened.',\%form);
340: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
341: return OK;
342: }
343: }
344:
345: if (!&Apache::lonnet::domain($form{'udom'})) {
346: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
347: return OK;
348: }
349:
1.138 raeburn 350: my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
1.136 kruse 351: if ($rolestr) {
352: $rolestr = &unescape($rolestr);
353: }
354: if ($symbstr) {
355: $symbstr= &unescape($symbstr);
356: }
1.138 raeburn 357: if ($iptokenstr) {
358: $iptokenstr = &unescape($iptokenstr);
359: }
1.136 kruse 360: if ($rolestr =~ /^role=/) {
361: (undef,$form{'role'}) = split('=',$rolestr);
362: }
363: if ($symbstr =~ /^symb=/) {
364: (undef,$form{'symb'}) = split('=',$symbstr);
365: }
1.138 raeburn 366: if ($iptokenstr =~ /^iptoken=/) {
367: (undef,$form{'iptoken'}) = split('=',$iptokenstr);
368: }
1.136 kruse 369:
1.139 raeburn 370: my $upass = $ENV{HTTPS} ? $form{'upass0'}
371: : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
1.136 kruse 372:
373: # ---------------------------------------------------------------- Authenticate
374:
375: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
376: my ($cancreate,$statustocreate) =
377: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
378: my $defaultauth;
379: if (ref($cancreate) eq 'ARRAY') {
380: if (grep(/^login$/,@{$cancreate})) {
381: $defaultauth = 1;
382: }
383: }
384: my $clientcancheckhost = 1;
385: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
386: $form{'udom'},$defaultauth,
387: $clientcancheckhost);
388:
389: # --------------------------------------------------------------------- Failed?
390:
391: if ($authhost eq 'no_host') {
392: &failed($r,'Username and/or password could not be authenticated.',
393: \%form);
394: return OK;
395: } elsif ($authhost eq 'no_account_on_host') {
396: if ($defaultauth) {
397: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
398: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
399: return OK;
400: }
401: my $start_page =
402: &Apache::loncommon::start_page('Create a user account in LON-CAPA');
403: my $lonhost = $r->dir_config('lonHostID');
404: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
405: my $contacts =
406: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
407: $form{'udom'},$origmail);
408: my ($contact_email) = split(',',$contacts);
409: my $output =
410: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
411: $domdesc,'',$lonhost,
412: $contact_email,$contact_name,
413: undef,$statustocreate);
414: &Apache::loncommon::content_type($r,'text/html');
415: $r->send_http_header;
416: &Apache::createaccount::print_header($r,$start_page);
417: $r->print('<h3>'.&mt('Account creation').'</h3>'.
418: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
419: $output.&Apache::loncommon::end_page());
420: return OK;
421: } else {
422: &failed($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);
423: return OK;
424: }
425: }
426:
427: if (($firsturl eq '') ||
428: ($firsturl=~/^\/adm\/(logout|remote)/)) {
429: $firsturl='/adm/roles';
430: }
431:
432: my $hosthere;
433: if ($form{'iptoken'}) {
1.138 raeburn 434: my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
435: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
1.136 kruse 436: if (($sessiondata{'domain'} eq $form{'udom'}) &&
437: ($sessiondata{'username'} eq $form{'uname'})) {
438: $hosthere = 1;
439: }
440: }
441:
442: # --------------------------------- Are we attempting to login as somebody else?
443: if ($form{'suname'}) {
444: # ------------ see if the original user has enough privileges to pull this stunt
445: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
446: # ---------------------------------------------------- see if the su-user exists
447: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
448: eq 'no_host') {
449: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
450: # ------------------------------ see if the su-user is not too highly privileged
451: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
452: # -------------------------------------------------------- actually switch users
453: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
454: ' logging in as '.$form{'suname'});
455: $form{'uname'}=$form{'suname'};
456: } else {
457: &Apache::lonnet::logthis('Attempted switch user to privileged user');
458: }
459: }
460: } else {
461: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
462: }
463: }
464:
465: my ($is_balancer,$otherserver);
466:
467: unless ($hosthere) {
468: ($is_balancer,$otherserver) =
469: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
470: }
471:
472: if ($is_balancer) {
473: if (!$otherserver) {
474: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
475: }
476: if ($otherserver) {
477: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
478: \%form);
479: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
480: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
481: $switchto .= '&origurl='.$firsturl;
482: }
483: if ($form{'role'}) {
484: $switchto .= '&role='.$form{'role'};
485: }
486: if ($form{'symb'}) {
487: $switchto .= '&symb='.$form{'symb'};
488: }
489: $r->internal_redirect($switchto);
490: } else {
491: $r->print(&noswitch());
492: }
493: return OK;
494: } else {
495: if (!&check_can_host($r,\%form,$authhost)) {
496: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
497: if ($otherserver) {
498: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
499: \%form);
500: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
501: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
502: $switchto .= '&origurl='.$firsturl;
503: }
504: if ($form{'role'}) {
505: $switchto .= '&role='.$form{'role'};
506: }
507: if ($form{'symb'}) {
508: $switchto .= '&symb='.$form{'symb'};
509: }
510: $r->internal_redirect($switchto);
511: } else {
512: $r->print(&noswitch());
513: }
514: return OK;
515: }
516:
517: # ------------------------------------------------------- Do the load balancing
518:
519: # ---------------------------------------------------------- Determine own load
520: my $loadlim = $r->dir_config('lonLoadLim');
521: my $loadavg;
522: {
523: my $loadfile=Apache::File->new('/proc/loadavg');
524: $loadavg=<$loadfile>;
525: }
526: $loadavg =~ s/\s.*//g;
527: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
528: my $userloadpercent=&Apache::lonnet::userload();
529:
530: # ---------------------------------------------------------- Are we overloaded?
531: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
532: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
533: if (!$unloaded) {
534: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
535: }
536: if ($unloaded) {
537: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
538: undef,\%form);
539: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
540: return OK;
541: }
542: }
543: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
544: \%form);
545: return OK;
546: }
547: }
548:
549: sub check_can_host {
550: my ($r,$form,$authhost,$domdesc) = @_;
551: return unless (ref($form) eq 'HASH');
552: my $canhost = 1;
553: my $lonhost = $r->dir_config('lonHostID');
554: my $udom = $form->{'udom'};
555: my @intdoms;
556: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
557: if (ref($internet_names) eq 'ARRAY') {
558: @intdoms = @{$internet_names};
559: }
560: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
561: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
562: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
563: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
564: my $hostname = &Apache::lonnet::hostname($lonhost);
565: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
566: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
567: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
568: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
569: my $loncaparev;
570: if ($authhost eq 'no_account_on_host') {
571: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
572: } else {
573: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
574: }
575: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
576: $udomdefaults{'remotesessions'},
577: $defdomdefaults{'hostedsessions'});
578: }
579: unless ($canhost) {
580: if ($authhost eq 'no_account_on_host') {
581: my $checkloginvia = 1;
582: my ($login_host,$hostname) =
583: &Apache::lonnet::choose_server($udom,$checkloginvia);
584: &Apache::loncommon::content_type($r,'text/html');
585: $r->send_http_header;
586: if ($login_host ne '') {
587: my $protocol = $Apache::lonnet::protocol{$login_host};
588: $protocol = 'http' if ($protocol ne 'https');
589: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
590: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
591: '<h3>'.&mt('Account creation').'</h3>'.
592: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
593: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
594: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
595: &Apache::loncommon::end_page());
596: } else {
597: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
598: '<h3>'.&mt('Account creation unavailable').'</h3>'.
599: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
600: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
601: &Apache::loncommon::end_page());
602: }
603: } else {
604: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
605: $form);
606: my ($otherserver) = &Apache::lonnet::choose_server($udom);
607: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
608: }
609: }
610: return $canhost;
611: }
612:
613: sub noswitch {
614: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
615: '<h3>'.&mt('Session unavailable').'</h3>'.
616: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
617: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
618: &Apache::loncommon::end_page();
619: return $result;
620: }
621:
622: sub loginhelpdisplay {
623: my ($authdomain) = @_;
624: my $login_help = 1;
625: my $lang = &Apache::lonlocal::current_language();
626: if ($login_help) {
627: my $dom = $authdomain;
628: if ($dom eq '') {
629: $dom = &Apache::lonnet::default_login_domain();
630: }
631: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
632: my $loginhelp_url;
633: if ($lang) {
634: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
635: if ($loginhelp_url ne '') {
636: return $loginhelp_url;
637: }
638: }
639: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
640: if ($loginhelp_url ne '') {
641: return $loginhelp_url;
642: } else {
643: return '/adm/loginproblems.html';
644: }
645: }
646: return;
647: }
648:
649: 1;
650: __END__
651:
652:
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