Annotation of loncom/auth/lonauth.pm, revision 1.171
1.136 kruse 1: # The LearningOnline Network
2: # User Authentication Module
3: #
1.171 ! raeburn 4: # $Id: lonauth.pm,v 1.170 2021/11/17 00:44:47 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 Apache::loncommon();
36: use Apache::lonnet;
37: use Apache::lonmenu();
38: use Apache::createaccount;
1.149 raeburn 39: use Apache::ltiauth;
1.136 kruse 40: use Fcntl qw(:flock);
41: use Apache::lonlocal;
42: use Apache::File();
43: use HTML::Entities;
1.143 raeburn 44: use Digest::MD5;
1.170 raeburn 45: use CGI::Cookie();
1.136 kruse 46:
47: # ------------------------------------------------------------ Successful login
48: sub success {
49: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
1.170 raeburn 50: $form,$skipcritical,$cid,$expirepub) = @_;
1.136 kruse 51:
52: # ------------------------------------------------------------ Get cookie ready
53: my $cookie =
54: &Apache::loncommon::init_user_environment($r, $username, $domain,
55: $authhost, $form,
56: {'extra_env' => $extra_env,});
57:
58: my $public=($username eq 'public' && $domain eq 'public');
59:
60: if ($public or $lowerurl eq 'noredirect') { return $cookie; }
61:
62: # -------------------------------------------------------------------- Log this
63:
1.162 raeburn 64: my $ip = &Apache::lonnet::get_requestor_ip();
1.136 kruse 65: &Apache::lonnet::log($domain,$username,$authhost,
1.162 raeburn 66: "Login $ip");
1.136 kruse 67:
68: # ------------------------------------------------- Check for critical messages
69:
1.149 raeburn 70: unless ($skipcritical) {
71: my @what=&Apache::lonnet::dump('critical',$domain,$username);
72: if ($what[0]) {
73: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
74: $lowerurl='/adm/email?critical=display';
75: }
1.136 kruse 76: }
77: }
78:
1.143 raeburn 79: # ----------------------------------------------------------- Get cookies ready
80: my ($securecookie,$defaultcookie);
1.154 raeburn 81: my $ssl = $r->subprocess_env('https');
82: if ($ssl) {
83: $securecookie="lonSID=$cookie; path=/; HttpOnly; secure";
1.143 raeburn 84: my $lonidsdir=$r->dir_config('lonIDsDir');
85: if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
86: my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
87: if (-e "$lonidsdir/$linkname.id") {
88: unlink("$lonidsdir/$linkname.id");
89: }
90: my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
91: "$lonidsdir/$linkname.id"); 1 };
92: if ($made_symlink) {
93: $defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
1.154 raeburn 94: &Apache::lonnet::appenv({'user.linkedenv' => $linkname});
1.143 raeburn 95: }
96: }
97: } else {
98: $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
99: }
1.136 kruse 100: # -------------------------------------------------------- Menu script and info
101: my $destination = $lowerurl;
1.149 raeburn 102: if ($env{'request.lti.login'}) {
103: if (($env{'request.lti.reqcrs'}) && ($env{'request.lti.reqrole'} eq 'cc')) {
104: &Apache::loncommon::content_type($r,'text/html');
105: if ($securecookie) {
106: $r->headers_out->add('Set-cookie' => $securecookie);
107: }
108: if ($defaultcookie) {
109: $r->headers_out->add('Set-cookie' => $defaultcookie);
110: }
111: $r->send_http_header;
1.152 raeburn 112: if (ref($form) eq 'HASH') {
1.158 raeburn 113: $form->{'lti.login'} = $env{'request.lti.login'};
1.152 raeburn 114: $form->{'lti.reqcrs'} = $env{'request.lti.reqcrs'};
115: $form->{'lti.reqrole'} = $env{'request.lti.reqrole'};
116: $form->{'lti.sourcecrs'} = $env{'request.lti.sourcecrs'};
117: }
1.149 raeburn 118: &Apache::ltiauth::lti_reqcrs($r,$domain,$form,$username,$domain);
119: return;
120: }
121: if ($env{'request.lti.selfenrollrole'}) {
122: if (&Apache::ltiauth::lti_enroll($username,$domain,
123: $env{'request.lti.selfenrollrole'}) eq 'ok') {
124: $form->{'role'} = $env{'request.lti.selfenrollrole'};
125: &Apache::lonnet::delenv('request.lti.selfenrollrole');
126: } else {
127: &Apache::ltiauth::invalid_request($r,24);
128: }
129: }
130: }
1.136 kruse 131: if (defined($form->{role})) {
132: my $envkey = 'user.role.'.$form->{role};
133: my $now=time;
134: my $then=$env{'user.login.time'};
135: my $refresh=$env{'user.refresh.time'};
136: my $update=$env{'user.update.time'};
137: if (!$update) {
138: $update = $then;
139: }
140: if (exists($env{$envkey})) {
141: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
142: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
143: \$trolecode,\$tstatus,\$tstart,\$tend);
144: if ($tstatus eq 'is') {
145: $destination .= ($destination =~ /\?/) ? '&' : '?';
146: my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
147: $destination .= 'selectrole=1&'.$newrole.'=1';
148: }
149: }
150: }
151: if (defined($form->{symb})) {
152: my $destsymb = $form->{symb};
1.159 raeburn 153: my $encrypted;
154: if ($destsymb =~ m{^/enc/}) {
155: $encrypted = 1;
156: if ($cid) {
157: $destsymb = &Apache::lonenc::unencrypted($destsymb,$cid);
158: }
159: }
1.136 kruse 160: $destination .= ($destination =~ /\?/) ? '&' : '?';
161: if ($destsymb =~ /___/) {
162: my ($map,$resid,$desturl)=split(/___/,$destsymb);
1.137 raeburn 163: $desturl = &Apache::lonnet::clutter($desturl);
1.159 raeburn 164: if ($encrypted) {
165: $desturl = &Apache::lonenc::encrypted($desturl,1,$cid);
166: $destsymb = $form->{symb};
167: }
1.136 kruse 168: $desturl = &HTML::Entities::encode($desturl,'"<>&');
169: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
170: $destination .= 'destinationurl='.$desturl.
171: '&destsymb='.$destsymb;
1.159 raeburn 172: } elsif (!$encrypted) {
1.136 kruse 173: $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
174: $destination .= 'destinationurl='.$destsymb;
175: }
176: }
177: if ($destination =~ m{^/adm/roles}) {
178: $destination .= ($destination =~ /\?/) ? '&' : '?';
179: $destination .= 'source=login';
180: }
181:
1.169 raeburn 182: if (($env{'request.deeplink.login'} eq $lowerurl) &&
183: (($env{'request.linkprot'}) || ($env{'request.linkkey'} ne ''))) {
184: my %info;
185: if ($env{'request.linkprot'}) {
186: $info{'linkprot'} = $env{'request.linkprot'};
187: } elsif ($env{'request.linkkey'} ne '') {
188: $info{'linkkey'} = $env{'request.linkkey'};
189: }
190: $info{'origurl'} = $lowerurl;
191: my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
192: unless (($token eq 'con_lost') || ($token eq 'refused') ||
193: ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
194: $destination .= (($destination =~ /\?/) ? '&' : '?') . 'ttoken='.$token;
195: }
196: }
197:
1.150 raeburn 198: my $windowname = 'loncapaclient';
199: if ($env{'request.lti.login'}) {
200: $windowname .= 'lti';
201: }
202: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="'.$windowname.'";');
1.136 kruse 203: my $brcrum = [{'href' => '',
204: 'text' => 'Successful Login'},];
1.140 raeburn 205: my $args = {'bread_crumbs' => $brcrum,};
206: unless ((defined($form->{role})) || (defined($form->{symb}))) {
207: my $update=$env{'user.update.time'};
208: if (!$update) {
209: $update = $env{'user.login.time'};
210: }
211: my %roles_in_env;
212: my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
213: if ($showcount == 1) {
214: foreach my $rolecode (keys(%roles_in_env)) {
215: my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
216: if ($cid) {
217: my %coursedescription =
218: &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
219: if ($coursedescription{'type'} eq 'Placement') {
220: $args->{'crstype'} = 'Placement';
221: }
222: last;
223: }
224: }
225: }
226: }
1.136 kruse 227:
228: # ------------------------------------------------- Output for successful login
229:
230: &Apache::loncommon::content_type($r,'text/html');
1.143 raeburn 231: if ($securecookie) {
232: $r->headers_out->add('Set-cookie' => $securecookie);
233: }
234: if ($defaultcookie) {
235: $r->headers_out->add('Set-cookie' => $defaultcookie);
236: }
1.170 raeburn 237: if ($expirepub) {
238: my $c = new CGI::Cookie(-name => 'lonPubID',
239: -value => '',
240: -expires => '-10y',);
241: $r->headers_out->add('Set-cookie' => $c);
242: }
1.136 kruse 243: $r->send_http_header;
244:
1.153 raeburn 245: my ($start_page,$js,$pagebody,$end_page);
1.151 raeburn 246: if ($env{'request.lti.login'}) {
1.153 raeburn 247: $args = {'only_body' => 1};
248: if ($env{'request.lti.target'} eq '') {
249: my $ltitarget = (($destination =~ /\?/) ? '&' : '?').
250: 'ltitarget=iframe';
251: $js = <<"ENDJS";
252:
253: <script type="text/javascript">
254: // <![CDATA[
255: function setLTItarget() {
256: var newloc = '$destination';
257: if (parent !== window) {
258: newloc += '$ltitarget';
259: }
260: window.location.href=newloc;
261: }
262: // ]]>
263: </script>
264:
265: ENDJS
266: $args->{'add_entries'} = {'onload' => "javascript:setLTItarget();"};
267: $pagebody = '<noscript><span class="LC_warning">'
268: .&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.')
269: .'</span></noscript>';
270: } else {
271: $args->{'redirect'} = [0,$destination,1];
272: }
273: $start_page=&Apache::loncommon::start_page('',$js,$args);
1.151 raeburn 274: } else {
1.153 raeburn 275: $args->{'redirect'} = [0,$destination];
1.151 raeburn 276: $start_page=&Apache::loncommon::start_page('Successful Login',
1.153 raeburn 277: $js,$args);
1.149 raeburn 278:
1.151 raeburn 279: my %lt=&Apache::lonlocal::texthash(
280: 'wel' => 'Welcome',
281: 'pro' => 'Login problems?',
282: );
283: $pagebody = "<h1>$lt{'wel'}</h1>\n".
284: &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
285: my $loginhelp = &loginhelpdisplay($domain);
286: if ($loginhelp) {
287: $pagebody .= '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
288: }
1.136 kruse 289: }
1.153 raeburn 290: $end_page = &Apache::loncommon::end_page();
1.136 kruse 291: $r->print(<<ENDSUCCESS);
292: $start_page
293: $windowinfo
1.151 raeburn 294: $pagebody
1.136 kruse 295: $end_page
296: ENDSUCCESS
297: return;
298: }
299:
300: # --------------------------------------------------------------- Failed login!
301:
302: sub failed {
1.171 ! raeburn 303: my ($r,$message,$form,$authhost) = @_;
1.136 kruse 304: (undef,undef,undef,my $clientmathml,my $clientunicode) =
305: &Apache::loncommon::decode_user_agent();
306: my $args = {};
307: if ($clientunicode && !$clientmathml) {
308: $args = {'browser.unicode' => 1};
309: }
310:
1.171 ! raeburn 311: my @actions;
1.136 kruse 312: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
313: my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
314: my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
315: if (&Apache::lonnet::domain($udom,'description') eq '') {
316: undef($udom);
317: }
1.171 ! raeburn 318: my $authtype;
! 319: if (($udom ne '') && ($uname ne '') && ($authhost eq 'no_host')) {
! 320: $authtype = &Apache::lonnet::queryauthenticate($uname,$udom);
! 321: }
1.136 kruse 322: my $retry = '/adm/login';
1.171 ! raeburn 323: if (($uname eq $form->{'uname'}) && ($authtype !~ /^lti:/)) {
1.136 kruse 324: $retry .= '?username='.$uname;
325: }
326: if ($udom) {
327: $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
328: }
1.168 raeburn 329: my $lonhost = $r->dir_config('lonHostID');
330: my $querystr;
331: my $result = &set_retry_token($form,$lonhost,\$querystr);
332: if ($result eq 'fail') {
333: if (exists($form->{role})) {
334: my $role = &Apache::loncommon::cleanup_html($form->{role});
335: if ($role ne '') {
336: $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
337: }
338: }
339: if (exists($form->{symb})) {
340: my $symb = &Apache::loncommon::cleanup_html($form->{symb});
341: if ($symb ne '') {
342: $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
343: }
344: }
345: if (exists($form->{firsturl})) {
346: my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
347: if ($firsturl ne '') {
348: $retry .= (($retry=~/\?/)?'&':'?').'firsturl='.$firsturl;
349: if ($form->{firsturl} =~ m{^/tiny/$match_domain/\w+$}) {
350: unless (exists($form->{linkprot})) {
351: if (exists($form->{linkkey})) {
352: $retry .= 'linkkey='.$form->{linkkey};
353: }
1.157 raeburn 354: }
355: }
356: }
1.155 raeburn 357: }
1.168 raeburn 358: if (exists($form->{linkprot})) {
359: my $ltoken = &Apache::lonnet::tmpput({linkprot => $form->{'linkprot'}},
1.169 raeburn 360: $r->dir_config('lonHostID'),'retry');
1.168 raeburn 361: if ($ltoken) {
362: $retry .= (($retry =~ /\?/) ? '&' : '?').'ltoken='.$ltoken;
363: }
1.156 raeburn 364: }
1.168 raeburn 365: } elsif ($querystr ne '') {
366: $retry .= (($retry=~/\?/)?'&':'?').$querystr;
1.156 raeburn 367: }
1.136 kruse 368: my $end_page = &Apache::loncommon::end_page();
369: &Apache::loncommon::content_type($r,'text/html');
370: $r->send_http_header;
1.171 ! raeburn 371: if ($authtype =~ /^lti:/) {
! 372: $message = &mt('Direct login is not supported with the username you entered.').
! 373: '<br /><br />'.
! 374: &mt('You likely need to launch LON-CAPA from within a course in a different Learning Management System.').
! 375: '<br />'.
! 376: &mt('You can also try to log in with a different username.');
! 377: @actions =
! 378: (&mt('Try your [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
! 379: } else {
! 380: $message = &mt($message);
! 381: @actions =
! 382: (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
! 383: }
1.136 kruse 384: my $loginhelp = &loginhelpdisplay($udom);
385: if ($loginhelp) {
386: push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
387: }
388: #FIXME: link to helpdesk might be added here
389: $r->print(
390: $start_page
391: .'<h2>'.&mt('Sorry ...').'</h2>'
1.171 ! raeburn 392: .&Apache::lonhtmlcommon::confirm_success($message,1).'<br /><br />'
1.136 kruse 393: .&Apache::lonhtmlcommon::actionbox(\@actions)
394: .$end_page
395: );
396: }
397:
398: # ------------------------------------------------------------------ Rerouting!
399:
400: sub reroute {
401: my ($r) = @_;
402: &Apache::loncommon::content_type($r,'text/html');
403: $r->send_http_header;
404: my $msg='<b>'.&mt('Sorry ...').'</b><br />'
405: .&mt('Please [_1]log in again[_2].');
406: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
407: }
408:
409: # ---------------------------------------------------------------- Main handler
410:
411: sub handler {
412: my $r = shift;
413: my $londocroot = $r->dir_config('lonDocRoot');
414: # Are we re-routing?
415: if (-e "$londocroot/lon-status/reroute.txt") {
416: &reroute($r);
417: return OK;
418: }
419:
420: &Apache::lonlocal::get_language_handle($r);
421:
422: # -------------------------------- Prevent users from attempting to login twice
423: my $handle = &Apache::lonnet::check_for_valid_session($r);
424: if ($handle ne '') {
425: my $lonidsdir=$r->dir_config('lonIDsDir');
426: if ($handle=~/^publicuser\_/) {
427: # For "public user" - remove it, we apparently really want to login
428: unlink($r->dir_config('lonIDsDir')."/$handle.id");
429: } else {
430: # Indeed, a valid token is found
431: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
432: &Apache::loncommon::content_type($r,'text/html');
433: $r->send_http_header;
1.166 raeburn 434: my $start_page =
1.136 kruse 435: &Apache::loncommon::start_page('Already logged in');
436: my $end_page =
437: &Apache::loncommon::end_page();
438: my $dest = '/adm/roles';
1.169 raeburn 439: my %form = &get_form_items($r);
440: if ($form{'logtoken'}) {
441: my $tmpinfo = &Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
442: $form{'serverid'});
443: unless (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
444: ($tmpinfo eq 'no_such_host')) {
445: my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
446: $firsturl = &unescape($firsturl);
447: my %info;
448: foreach my $item (@rest) {
449: my ($key,$value) = split(/=/,$item);
450: $info{$key} = &unescape($value);
451: }
452: if ($firsturl ne '') {
453: $info{'firsturl'} = $firsturl;
454: $dest = $firsturl;
455: my $relogin;
456: if ($dest =~ m{^/tiny/$match_domain/\w+$}) {
457: if ($env{'request.course.id'}) {
458: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
459: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
460: my $symb = &Apache::loncommon::symb_from_tinyurl($dest,$cnum,$cdom);
461: if ($symb) {
462: unless (&set_deeplink_login(%info) eq 'ok') {
463: $relogin = 1;
464: }
465: }
466: }
467: if ($relogin) {
468: $r->print(
469: $start_page
470: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
471: .'<p>'.&mt('Please [_1]log out[_2] first, and then try your access again',
472: '<a href="/adm/logout">','</a>')
473: .'</p>'
474: .$end_page);
475: } else {
476: if (($info{'linkprot'}) || ($info{'linkkey'} ne '')) {
477: my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
478: unless (($token eq 'con_lost') || ($token eq 'refused') ||
479: ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
480: $dest .= (($dest =~ /\?/) ? '&' : '?') . 'ttoken='.$token;
481: }
482: }
483: $r->print(
484: $start_page
485: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
486: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4] first, and then try your access again',
487: '<a href="'.$dest.'">','</a>',
488: '<a href="/adm/logout">','</a>')
489: .'</p>'
490: .$end_page);
491: }
492: return OK;
1.164 raeburn 493: }
494: }
1.157 raeburn 495: }
1.136 kruse 496: }
497: $r->print(
1.169 raeburn 498: $start_page
499: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
500: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
501: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
502: .'</p>'
503: .$end_page
1.136 kruse 504: );
505: return OK;
506: }
507: }
508:
509: # ---------------------------------------------------- No valid token, continue
510:
1.169 raeburn 511: my %form = &get_form_items($r);
1.136 kruse 512: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
513: &failed($r,'Username, password and domain need to be specified.',
514: \%form);
515: return OK;
516: }
517:
518: # split user logging in and "su"-user
519:
1.145 raeburn 520: ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
1.136 kruse 521: $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
522: $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
1.145 raeburn 523: $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
524: $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
1.136 kruse 525:
526: my $role = $r->dir_config('lonRole');
527: my $domain = $r->dir_config('lonDefDomain');
528: my $prodir = $r->dir_config('lonUsersDir');
529: my $contact_name = &mt('LON-CAPA helpdesk');
530:
531: # ---------------------------------------- Get the information from login token
532:
533: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
534: $form{'serverid'});
535:
536: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
537: ($tmpinfo eq 'no_such_host')) {
538: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
539: return OK;
540: } else {
541: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
542: $form{'serverid'});
543: if ( $reply ne 'ok' ) {
544: &failed($r,'Session could not be opened.',\%form);
545: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
546: return OK;
547: }
548: }
549:
550: if (!&Apache::lonnet::domain($form{'udom'})) {
551: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
552: return OK;
553: }
554:
1.169 raeburn 555: my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
556: $firsturl = &unescape($firsturl);
1.168 raeburn 557: foreach my $item (@rest) {
558: my ($key,$value) = split(/=/,$item);
559: $form{$key} = &unescape($value);
1.156 raeburn 560: }
1.155 raeburn 561: if ($firsturl =~ m{^/tiny/$match_domain/\w+$}) {
562: $form{'firsturl'} = $firsturl;
563: }
1.139 raeburn 564: my $upass = $ENV{HTTPS} ? $form{'upass0'}
1.169 raeburn 565: : &Apache::loncommon::des_decrypt($des_key,$form{'upass0'});
1.136 kruse 566:
567: # ---------------------------------------------------------------- Authenticate
568:
569: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
570: my ($cancreate,$statustocreate) =
571: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
572: my $defaultauth;
573: if (ref($cancreate) eq 'ARRAY') {
574: if (grep(/^login$/,@{$cancreate})) {
575: $defaultauth = 1;
576: }
577: }
578: my $clientcancheckhost = 1;
579: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
580: $form{'udom'},$defaultauth,
581: $clientcancheckhost);
1.149 raeburn 582:
1.136 kruse 583: # --------------------------------------------------------------------- Failed?
584:
585: if ($authhost eq 'no_host') {
586: &failed($r,'Username and/or password could not be authenticated.',
1.171 ! raeburn 587: \%form,$authhost);
1.136 kruse 588: return OK;
589: } elsif ($authhost eq 'no_account_on_host') {
590: if ($defaultauth) {
591: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
592: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
593: return OK;
594: }
595: my $start_page =
1.168 raeburn 596: &Apache::loncommon::start_page('Create a user account in LON-CAPA',
597: '',{'no_inline_link' => 1,});
1.136 kruse 598: my $lonhost = $r->dir_config('lonHostID');
599: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
600: my $contacts =
601: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
602: $form{'udom'},$origmail);
603: my ($contact_email) = split(',',$contacts);
604: my $output =
605: &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
606: $domdesc,'',$lonhost,
607: $contact_email,$contact_name,
608: undef,$statustocreate);
609: &Apache::loncommon::content_type($r,'text/html');
610: $r->send_http_header;
611: &Apache::createaccount::print_header($r,$start_page);
612: $r->print('<h3>'.&mt('Account creation').'</h3>'.
613: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
614: $output.&Apache::loncommon::end_page());
615: return OK;
616: } else {
617: &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);
618: return OK;
619: }
620: }
621:
622: if (($firsturl eq '') ||
623: ($firsturl=~/^\/adm\/(logout|remote)/)) {
624: $firsturl='/adm/roles';
625: }
626:
1.169 raeburn 627: my ($hosthere,%sessiondata);
1.136 kruse 628: if ($form{'iptoken'}) {
1.169 raeburn 629: %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
1.138 raeburn 630: my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
1.136 kruse 631: if (($sessiondata{'domain'} eq $form{'udom'}) &&
632: ($sessiondata{'username'} eq $form{'uname'})) {
633: $hosthere = 1;
634: }
635: }
636:
637: # --------------------------------- Are we attempting to login as somebody else?
638: if ($form{'suname'}) {
1.145 raeburn 639: my ($suname,$sudom,$sudomref);
640: $suname = $form{'suname'};
641: $sudom = $form{'udom'};
642: if ($form{'sudom'}) {
643: unless ($sudom eq $form{'sudom'}) {
644: if (&Apache::lonnet::domain($form{'sudom'})) {
645: $sudomref = [$form{'sudom'}];
646: $sudom = $form{'sudom'};
647: }
648: }
649: }
1.136 kruse 650: # ------------ see if the original user has enough privileges to pull this stunt
1.145 raeburn 651: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
1.136 kruse 652: # ---------------------------------------------------- see if the su-user exists
1.145 raeburn 653: unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
1.136 kruse 654: # ------------------------------ see if the su-user is not too highly privileged
1.146 raeburn 655: if (&Apache::lonnet::privileged($suname,$sudom)) {
656: &Apache::lonnet::logthis('Attempted switch user to privileged user');
657: } else {
658: my $noprivswitch;
1.145 raeburn 659: #
660: # su-user's home server and user's home server must have one of:
1.147 raeburn 661: # (a) same domain
662: # (b) same primary library server for the two domains
663: # (c) same "internet domain" for primary library server(s) for home servers' domains
1.145 raeburn 664: #
1.148 raeburn 665: my $suprim = &Apache::lonnet::domain($sudom,'primary');
666: my $suintdom = &Apache::lonnet::internet_dom($suprim);
1.145 raeburn 667: unless ($sudom eq $form{'udom'}) {
1.148 raeburn 668: my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
669: my $uintdom = &Apache::lonnet::internet_dom($uprim);
1.145 raeburn 670: unless ($suprim eq $uprim) {
671: unless ($suintdom eq $uintdom) {
672: &Apache::lonnet::logthis('Attempted switch user '
1.169 raeburn 673: .'to user with different "internet domain".');
1.146 raeburn 674: $noprivswitch = 1;
1.145 raeburn 675: }
676: }
677: }
678:
1.146 raeburn 679: unless ($noprivswitch) {
680: #
681: # server where log-in occurs must have same "internet domain" as su-user's home
682: # server
683: #
684: my $lonhost = $r->dir_config('lonHostID');
685: my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
1.148 raeburn 686: if ($hostintdom ne $suintdom) {
1.146 raeburn 687: &Apache::lonnet::logthis('Attempted switch user on a '
688: .'server with a different "internet domain".');
689: } else {
690:
1.136 kruse 691: # -------------------------------------------------------- actually switch users
1.145 raeburn 692:
1.146 raeburn 693: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
694: $form{'udom'}.' logging in as '.$suname.':'.$sudom);
695: $form{'uname'}=$suname;
696: if ($form{'udom'} ne $sudom) {
697: $form{'udom'}=$sudom;
698: }
699: }
1.145 raeburn 700: }
1.136 kruse 701: }
702: }
703: } else {
704: &Apache::lonnet::logthis('Non-privileged user attempting switch user');
705: }
706: }
707:
708: my ($is_balancer,$otherserver);
709:
710: unless ($hosthere) {
711: ($is_balancer,$otherserver) =
1.141 raeburn 712: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
713: if ($is_balancer) {
1.161 raeburn 714: # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
715: my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
716: if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
717: $otherserver = $found_server;
718: }
1.141 raeburn 719: if ($otherserver eq '') {
720: my $lowest_load;
721: ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
722: if ($lowest_load > 100) {
1.163 raeburn 723: $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$form{'udom'});
1.141 raeburn 724: }
725: }
726: if ($otherserver ne '') {
727: my @hosts = &Apache::lonnet::current_machine_ids();
728: if (grep(/^\Q$otherserver\E$/,@hosts)) {
729: $hosthere = $otherserver;
730: }
731: }
732: }
1.136 kruse 733: }
734:
1.141 raeburn 735: if (($is_balancer) && (!$hosthere)) {
1.136 kruse 736: if ($otherserver) {
737: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
738: \%form);
739: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
740: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
1.168 raeburn 741: $switchto .= '&origurl='.$firsturl;
1.136 kruse 742: }
743: if ($form{'role'}) {
744: $switchto .= '&role='.$form{'role'};
745: }
746: if ($form{'symb'}) {
747: $switchto .= '&symb='.$form{'symb'};
748: }
1.156 raeburn 749: if ($form{'linkprot'}) {
750: $env{'request.linkprot'} = $form{'linkprot'};
1.167 raeburn 751: } elsif ($form{'linkkey'} ne '') {
1.164 raeburn 752: $env{'request.linkkey'} = $form{'linkkey'};
753: }
754: if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
755: &set_deeplink_login(%form);
1.156 raeburn 756: }
1.136 kruse 757: $r->internal_redirect($switchto);
758: } else {
1.160 raeburn 759: &Apache::loncommon::content_type($r,'text/html');
760: $r->send_http_header;
1.136 kruse 761: $r->print(&noswitch());
762: }
763: return OK;
764: } else {
765: if (!&check_can_host($r,\%form,$authhost)) {
766: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
767: if ($otherserver) {
768: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
769: \%form);
770: my $switchto = '/adm/switchserver?otherserver='.$otherserver;
771: if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
1.168 raeburn 772: $switchto .= '&origurl='.$firsturl;
1.136 kruse 773: }
774: if ($form{'role'}) {
775: $switchto .= '&role='.$form{'role'};
776: }
777: if ($form{'symb'}) {
778: $switchto .= '&symb='.$form{'symb'};
779: }
1.156 raeburn 780: if ($form{'linkprot'}) {
781: $env{'request.linkprot'} = $form{'linkprot'};
1.167 raeburn 782: } elsif ($form{'linkkey'} ne '') {
1.164 raeburn 783: $env{'request.linkkey'} = $form{'linkkey'};
784: }
785: if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
786: &set_deeplink_login(%form);
1.156 raeburn 787: }
1.136 kruse 788: $r->internal_redirect($switchto);
789: } else {
1.160 raeburn 790: &Apache::loncommon::content_type($r,'text/html');
791: $r->send_http_header;
1.136 kruse 792: $r->print(&noswitch());
793: }
794: return OK;
795: }
796:
797: # ------------------------------------------------------- Do the load balancing
798:
799: # ---------------------------------------------------------- Determine own load
800: my $loadlim = $r->dir_config('lonLoadLim');
801: my $loadavg;
802: {
803: my $loadfile=Apache::File->new('/proc/loadavg');
804: $loadavg=<$loadfile>;
805: }
806: $loadavg =~ s/\s.*//g;
807: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
808: my $userloadpercent=&Apache::lonnet::userload();
809:
810: # ---------------------------------------------------------- Are we overloaded?
811: if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
1.163 raeburn 812: my $unloaded=Apache::lonnet::spareserver($r,$loadpercent,$userloadpercent,1,$form{'udom'});
1.136 kruse 813: if (!$unloaded) {
814: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
815: }
816: if ($unloaded) {
817: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
818: undef,\%form);
1.156 raeburn 819: if ($form{'linkprot'}) {
820: $env{'request.linkprot'} = $form{'linkprot'};
1.167 raeburn 821: } elsif ($form{'linkkey'} ne '') {
1.164 raeburn 822: $env{'request.linkkey'} = $form{'linkkey'};
823: }
824: if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
825: &set_deeplink_login(%form);
1.156 raeburn 826: }
1.136 kruse 827: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
828: return OK;
829: }
830: }
1.141 raeburn 831: if (($is_balancer) && ($hosthere)) {
832: $form{'noloadbalance'} = $hosthere;
833: }
1.156 raeburn 834: my $extra_env;
1.169 raeburn 835: if (($hosthere) && ($sessiondata{'sessionserver'} ne '')) {
836: if ($sessiondata{'origurl'} ne '') {
837: $firsturl = $sessiondata{'origurl'};
838: $form{'firsturl'} = $sessiondata{'origurl'};
839: my @names = ('role','symb','linkprot','linkkey');
840: foreach my $item (@names) {
841: if ($sessiondata{$item} ne '') {
842: $form{$item} = $sessiondata{$item};
843: }
844: }
845: }
846: }
1.156 raeburn 847: if ($form{'linkprot'}) {
848: my ($linkprotector,$uri) = split(/:/,$form{'linkprot'},2);
849: if ($linkprotector) {
850: $extra_env = {'user.linkprotector' => $linkprotector,
1.164 raeburn 851: 'user.linkproturi' => $uri};
1.156 raeburn 852: }
1.167 raeburn 853: } elsif ($form{'linkkey'} ne '') {
1.166 raeburn 854: $extra_env = {'user.deeplinkkey' => $form{'linkkey'},
1.164 raeburn 855: 'user.keyedlinkuri' => $form{'firsturl'}};
856: }
857: if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
858: &set_deeplink_login(%form);
1.166 raeburn 859: if ($form{'linkprot'}) {
860: if (ref($extra_env) eq 'HASH') {
861: %{$extra_env} = ( %{$extra_env}, 'request.linkprot' => $form{'linkprot'} );
862: } else {
863: $extra_env = {'request.linkprot' => $form{'linkprot'}};
864: }
1.167 raeburn 865: } elsif ($form{'linkkey'} ne '') {
1.166 raeburn 866: if (ref($extra_env) eq 'HASH') {
867: %{$extra_env} = ( %{$extra_env}, 'request.linkkey' => $form{'linkkey'} );
868: } else {
869: $extra_env = {'request.linkkey' => $form{'linkkey'}};
870: }
871: }
1.164 raeburn 872: if ($env{'request.deeplink.login'}) {
873: if (ref($extra_env) eq 'HASH') {
874: %{$extra_env} = ( %{$extra_env}, 'request.deeplink.login' => $form{'firsturl'} );
875: } else {
876: $extra_env = {'request.deeplink.login' => $form{'firsturl'}};
877: }
1.157 raeburn 878: }
1.156 raeburn 879: }
880: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,$extra_env,
1.136 kruse 881: \%form);
882: return OK;
883: }
884: }
885:
1.169 raeburn 886: sub get_form_items {
887: my ($r) = @_;
888: my $buffer;
889: if ($r->header_in('Content-length') > 0) {
890: $r->read($buffer,$r->header_in('Content-length'),0);
891: }
892: my %form;
893: foreach my $pair (split(/&/,$buffer)) {
894: my ($name,$value) = split(/=/,$pair);
895: $value =~ tr/+/ /;
896: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
897: $form{$name}=$value;
898: }
899: return %form;
900: }
901:
1.164 raeburn 902: sub set_deeplink_login {
903: my (%form) = @_;
1.169 raeburn 904: my $disallow;
1.164 raeburn 905: if ($form{'firsturl'} =~ m{^/tiny/($match_domain)/\w+$}) {
906: my $cdom = $1;
907: my ($cnum,$symb) = &Apache::loncommon::symb_from_tinyurl($form{'firsturl'},'',$cdom);
908: if ($symb) {
1.166 raeburn 909: if ($env{'request.course.id'} eq $cdom.'_'.$cnum) {
1.169 raeburn 910: my $deeplink;
1.166 raeburn 911: if ($symb =~ /\.(page|sequence)$/) {
912: my $mapname = &Apache::lonnet::deversion((&Apache::lonnet::decode_symb($symb))[2]);
913: my $navmap = Apache::lonnavmaps::navmap->new();
914: if (ref($navmap)) {
915: $deeplink = $navmap->get_mapparam(undef,$mapname,'0.deeplink');
916: }
917: } else {
918: $deeplink = &Apache::lonnet::EXT('resource.0.deeplink',$symb);
919: }
920: if ($deeplink ne '') {
921: my ($state,$others,$listed,$scope,$protect) = split(/,/,$deeplink);
922: if (($protect ne 'none') && ($protect ne '')) {
923: my ($acctype,$item) = split(/:/,$protect);
924: if ($acctype =~ /lti(c|d)$/) {
925: unless ($form{'linkprot'} eq $item.$1.':'.$env{'request.deeplink.login'}) {
926: $disallow = 1;
927: }
928: } elsif ($acctype eq 'key') {
929: unless ($form{'linkkey'} eq $item) {
930: $disallow = 1;
931: }
1.164 raeburn 932: }
933: }
934: }
1.166 raeburn 935: unless ($disallow) {
936: $env{'request.deeplink.login'} = $form{'firsturl'};
937: }
938: } else {
1.164 raeburn 939: $env{'request.deeplink.login'} = $form{'firsturl'};
940: }
941: }
942: }
1.169 raeburn 943: if ($disallow) {
944: return;
945: }
946: return 'ok';
1.164 raeburn 947: }
948:
1.168 raeburn 949: sub set_retry_token {
950: my ($form,$lonhost,$querystr) = @_;
951: if (ref($form) eq 'HASH') {
952: my ($firsturl,$token,$extras,@names);
1.169 raeburn 953: @names = ('role','symb','linkprot','linkkey','iptoken');
1.168 raeburn 954: foreach my $name (@names) {
955: if ($form->{$name} ne '') {
956: $extras .= '&'.$name.'='.&escape($form->{$name});
957: last if ($name eq 'linkprot');
958: }
959: }
960: my $firsturl = $form->{'firsturl'};
961: if (($firsturl ne '') || ($extras ne '')) {
962: $extras .= ':retry';
963: $token = &Apache::lonnet::reply('tmpput:'.&escape($firsturl).
964: $extras,$lonhost);
965: if (($token eq 'con_lost') || ($token eq 'no_such_host')) {
966: return 'fail';
967: } else {
968: if (ref($querystr)) {
969: $$querystr = 'retry='.$token;
970: }
971: return 'ok';
972: }
973: }
974: }
975: return;
976: }
977:
1.136 kruse 978: sub check_can_host {
979: my ($r,$form,$authhost,$domdesc) = @_;
980: return unless (ref($form) eq 'HASH');
981: my $canhost = 1;
982: my $lonhost = $r->dir_config('lonHostID');
983: my $udom = $form->{'udom'};
984: my @intdoms;
985: my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
986: if (ref($internet_names) eq 'ARRAY') {
987: @intdoms = @{$internet_names};
988: }
989: my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
990: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
991: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
992: my $machine_dom = &Apache::lonnet::host_domain($lonhost);
993: my $hostname = &Apache::lonnet::hostname($lonhost);
994: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
995: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
996: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
997: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
998: my $loncaparev;
999: if ($authhost eq 'no_account_on_host') {
1000: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
1001: } else {
1002: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
1003: }
1004: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
1005: $udomdefaults{'remotesessions'},
1006: $defdomdefaults{'hostedsessions'});
1007: }
1008: unless ($canhost) {
1009: if ($authhost eq 'no_account_on_host') {
1010: my $checkloginvia = 1;
1011: my ($login_host,$hostname) =
1012: &Apache::lonnet::choose_server($udom,$checkloginvia);
1013: &Apache::loncommon::content_type($r,'text/html');
1014: $r->send_http_header;
1015: if ($login_host ne '') {
1016: my $protocol = $Apache::lonnet::protocol{$login_host};
1017: $protocol = 'http' if ($protocol ne 'https');
1.163 raeburn 1018: my $alias = &Apache::lonnet::use_proxy_alias($r,$login_host);
1019: $hostname = $alias if ($alias ne '');
1.136 kruse 1020: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
1.156 raeburn 1021: #FIXME Should preserve where user was going and linkprot by setting ltoken at $login_host
1.136 kruse 1022: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
1023: '<h3>'.&mt('Account creation').'</h3>'.
1024: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
1025: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
1026: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
1027: &Apache::loncommon::end_page());
1028: } else {
1029: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
1030: '<h3>'.&mt('Account creation unavailable').'</h3>'.
1031: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
1032: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
1033: &Apache::loncommon::end_page());
1034: }
1035: } else {
1036: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
1037: $form);
1.168 raeburn 1038: if ($form->{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
1039: $env{'request.deeplink.login'} = $form->{'firsturl'};
1040: }
1.156 raeburn 1041: if ($form->{'linkprot'}) {
1042: $env{'request.linkprot'} = $form->{'linkprot'};
1.168 raeburn 1043: } elsif ($form->{'linkkey'} ne '') {
1044: $env{'request.linkkey'} = $form->{'linkkey'};
1.156 raeburn 1045: }
1.136 kruse 1046: my ($otherserver) = &Apache::lonnet::choose_server($udom);
1047: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
1048: }
1049: }
1050: return $canhost;
1051: }
1052:
1053: sub noswitch {
1054: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
1055: '<h3>'.&mt('Session unavailable').'</h3>'.
1056: &mt('This LON-CAPA server is unable to host your session.').'<br />'.
1057: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
1058: &Apache::loncommon::end_page();
1059: return $result;
1060: }
1061:
1062: sub loginhelpdisplay {
1063: my ($authdomain) = @_;
1064: my $login_help = 1;
1065: my $lang = &Apache::lonlocal::current_language();
1066: if ($login_help) {
1067: my $dom = $authdomain;
1068: if ($dom eq '') {
1069: $dom = &Apache::lonnet::default_login_domain();
1070: }
1071: my %domconfhash = &Apache::loncommon::get_domainconf($dom);
1072: my $loginhelp_url;
1073: if ($lang) {
1074: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
1075: if ($loginhelp_url ne '') {
1076: return $loginhelp_url;
1077: }
1078: }
1079: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
1080: if ($loginhelp_url ne '') {
1081: return $loginhelp_url;
1082: } else {
1083: return '/adm/loginproblems.html';
1084: }
1085: }
1086: return;
1087: }
1088:
1089: 1;
1090: __END__
1091:
1092:
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