File:  [LON-CAPA] / loncom / auth / lonauth.pm
Revision 1.118: download - view: text, annotated - select for diffs
Wed Aug 17 03:52:36 2011 UTC (12 years, 9 months ago) by raeburn
Branches: MAIN
CVS tags: HEAD
 - &lonnet::choose_server() returns an array.

    1: # The LearningOnline Network
    2: # User Authentication Module
    3: #
    4: # $Id: lonauth.pm,v 1.118 2011/08/17 03:52:36 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|uploaded|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: 				       'log' => 'loginproblems.html',
  143: 				       );
  144:     my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>'); 
  145:     $r->print(<<ENDSUCCESS);
  146: $start_page
  147: $windowinfo
  148: <h1>$lt{'wel'}</h1>
  149: $welcome<p>
  150: <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>
  151: $continuelink
  152: $end_page
  153: ENDSUCCESS
  154: }
  155: 
  156: # --------------------------------------------------------------- Failed login!
  157: 
  158: sub failed {
  159:     my ($r,$message,$form) = @_;
  160:     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef);
  161:     my $retry = '/adm/login?username='.$form->{'uname'}.
  162:                 '&domain='.$form->{'udom'};
  163:     if (exists($form->{role})) {
  164:         $retry .= '&role='.$form->{role};
  165:     }
  166:     if (exists($form->{symb})) {
  167:         $retry .= '&symb='.$form->{symb};
  168:     }
  169:     my $end_page   = &Apache::loncommon::end_page();
  170:     &Apache::loncommon::content_type($r,'text/html');
  171:     $r->send_http_header;
  172:     $r->print(
  173:        $start_page
  174:       .'<h1>'.&mt('Sorry ...').'</h1>'
  175:       .'<p class="LC_warning">'.&mt($message).'</p>'
  176:       .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
  177:       .'</p>'
  178:       .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
  179:       .$end_page
  180:     );
  181:  }
  182: 
  183: # ------------------------------------------------------------------ Rerouting!
  184: 
  185: sub reroute {
  186:     my ($r) = @_;
  187:     &Apache::loncommon::content_type($r,'text/html');
  188:     $r->send_http_header;
  189:     my $msg='<h1>'.&mt('Sorry ...').'</h1>'
  190:            .&mt('Please [_1]log in again[_2].');
  191:     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
  192: }
  193: 
  194: # ---------------------------------------------------------------- Main handler
  195: 
  196: sub handler {
  197:     my $r = shift;
  198:     my $form;
  199: # Are we re-routing?
  200:     if (-e '/home/httpd/html/lon-status/reroute.txt') {
  201: 	&reroute($r);
  202: 	return OK;
  203:     }
  204: 
  205:     &Apache::lonlocal::get_language_handle($r);
  206: 
  207: # -------------------------------- Prevent users from attempting to login twice
  208:     my $handle = &Apache::lonnet::check_for_valid_session($r);
  209:     if ($handle ne '') {
  210:         my $lonidsdir=$r->dir_config('lonIDsDir');
  211:         if ($handle=~/^publicuser\_/) {
  212: # For "public user" - remove it, we apparently really want to login
  213:             unlink($r->dir_config('lonIDsDir')."/$handle.id");
  214:         } else {
  215: # Indeed, a valid token is found
  216:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
  217: 	    &Apache::loncommon::content_type($r,'text/html');
  218: 	    $r->send_http_header;
  219: 	    my $start_page = 
  220: 	        &Apache::loncommon::start_page('Already logged in');
  221: 	    my $end_page = 
  222: 	        &Apache::loncommon::end_page();
  223:             my $dest = '/adm/roles';
  224:             if ($env{'form.firsturl'} ne '') {
  225:                 $dest = $env{'form.firsturl'};
  226:             }
  227:             $r->print(
  228:                $start_page
  229:               .'<h1>'.&mt('You are already logged in!').'</h1>'
  230:               .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
  231:                     ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
  232:               .'</p>'
  233:               .$end_page
  234:             );
  235:             return OK;
  236:         }
  237:     }
  238: 
  239: # ---------------------------------------------------- No valid token, continue
  240: 
  241: 
  242:     my $buffer;
  243:     if ($r->header_in('Content-length') > 0) {
  244: 	$r->read($buffer,$r->header_in('Content-length'),0);
  245:     }
  246:     my %form;
  247:     foreach my $pair (split(/&/,$buffer)) {
  248:        my ($name,$value) = split(/=/,$pair);
  249:        $value =~ tr/+/ /;
  250:        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
  251:        $form{$name}=$value;
  252:     } 
  253: 
  254:     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
  255: 	&failed($r,'Username, password and domain need to be specified.',
  256: 		\%form);
  257:         return OK;
  258:     }
  259: 
  260: # split user logging in and "su"-user
  261: 
  262:     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
  263:     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
  264:     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
  265:     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
  266: 
  267:     my $role   = $r->dir_config('lonRole');
  268:     my $domain = $r->dir_config('lonDefDomain');
  269:     my $prodir = $r->dir_config('lonUsersDir');
  270:     my $contact_name = &mt('LON-CAPA helpdesk');
  271: 
  272: # ---------------------------------------- Get the information from login token
  273: 
  274:     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
  275:                                       $form{'serverid'});
  276: 
  277:     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') || 
  278:         ($tmpinfo eq 'no_such_host')) {
  279: 	&failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
  280:         return OK;
  281:     } else {
  282: 	my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
  283: 					   $form{'serverid'});
  284:         if ( $reply ne 'ok' ) {
  285:             &failed($r,'Session could not be opened.',\%form);
  286: 	    &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
  287: 	    return OK;
  288: 	}
  289:     }
  290: 
  291:     if (!&Apache::lonnet::domain($form{'udom'})) {
  292:         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
  293:         return OK;
  294:     }
  295: 
  296:     my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
  297:     if ($rolestr) {
  298:         $rolestr = &unescape($rolestr);
  299:     }
  300:     if ($symbstr) {
  301:         $symbstr= &unescape($symbstr);
  302:     }
  303:     if ($rolestr =~ /^role=/) {
  304:         (undef,$form{'role'}) = split('=',$rolestr);
  305:     }
  306:     if ($symbstr =~ /^symb=/) { 
  307:         (undef,$form{'symb'}) = split('=',$symbstr);
  308:     }
  309: 
  310:     my $keybin=pack("H16",$key);
  311: 
  312:     my $cipher;
  313:     if ($Crypt::DES::VERSION>=2.03) {
  314: 	$cipher=new Crypt::DES $keybin;
  315:     }
  316:     else {
  317: 	$cipher=new DES $keybin;
  318:     }
  319:     my $upass='';
  320:     for (my $i=0;$i<=2;$i++) {
  321: 	my $chunk=
  322: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
  323: 
  324: 	$chunk.=
  325: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
  326: 
  327: 	$chunk=substr($chunk,1,ord(substr($chunk,0,1)));
  328: 	$upass.=$chunk;
  329:     }
  330: 
  331: # ---------------------------------------------------------------- Authenticate
  332:     my @cancreate;
  333:     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
  334:     if (ref($domconfig{'usercreation'}) eq 'HASH') {
  335:         if (ref($domconfig{'usercreation'}{'cancreate'}) eq 'HASH') {
  336:             if (ref($domconfig{'usercreation'}{'cancreate'}{'selfcreate'}) eq 'ARRAY') {
  337:                 @cancreate = @{$domconfig{'usercreation'}{'cancreate'}{'selfcreate'}};
  338:             } elsif (($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne 'none') && 
  339:                      ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'} ne '')) {
  340:                 @cancreate = ($domconfig{'usercreation'}{'cancreate'}{'selfcreate'});
  341:             }
  342:         }
  343:     }
  344:     my $defaultauth;
  345:     if (grep(/^login$/,@cancreate)) {
  346:         $defaultauth = 1;
  347:     }
  348:     my $clientcancheckhost = 1;
  349:     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
  350:                                               $form{'udom'},$defaultauth,
  351:                                               $clientcancheckhost);
  352:     
  353: # --------------------------------------------------------------------- Failed?
  354: 
  355:     if ($authhost eq 'no_host') {
  356: 	&failed($r,'Username and/or password could not be authenticated.',
  357: 		\%form);
  358:         return OK;
  359:     } elsif ($authhost eq 'no_account_on_host') {
  360:         my %domconfig = 
  361:             &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
  362:         if (grep(/^login$/,@cancreate)) {
  363:             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
  364:             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
  365:                 return OK;
  366:             }
  367:             my $start_page = 
  368:                 &Apache::loncommon::start_page('Create a user account in LON-CAPA');
  369:             my $lonhost = $r->dir_config('lonHostID');
  370:             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
  371:             my $contacts = 
  372:                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
  373:                                                         $form{'udom'},$origmail);
  374:             my ($contact_email) = split(',',$contacts); 
  375:             my $output = &Apache::createaccount::username_check($form{'uname'}, 
  376:                                                                 $form{'udom'},$domdesc,'',
  377:                                                                 $lonhost,$contact_email,$contact_name);
  378:             &Apache::loncommon::content_type($r,'text/html');
  379:             $r->send_http_header;
  380:             &Apache::createaccount::print_header($r,$start_page);
  381:             $r->print('<h3>'.&mt('Account creation').'</h3>'.
  382:                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
  383:                       $output.&Apache::loncommon::end_page());
  384:             return OK;
  385:         } else {
  386:             &failed($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);
  387:             return OK;
  388:         }
  389:     }
  390: 
  391:     if (($firsturl eq '') || 
  392: 	($firsturl=~/^\/adm\/(logout|remote)/)) {
  393: 	$firsturl='/adm/roles';
  394:     }
  395: # --------------------------------- Are we attempting to login as somebody else?
  396:     if ($form{'suname'}) {
  397: # ------------ see if the original user has enough privileges to pull this stunt
  398: 	if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
  399: # ---------------------------------------------------- see if the su-user exists
  400: 	    unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
  401: 		eq 'no_host') {
  402: 		&Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
  403: # ------------------------------ see if the su-user is not too highly privileged
  404: 		unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
  405: # -------------------------------------------------------- actually switch users
  406: 		    &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
  407: 			' logging in as '.$form{'suname'});
  408: 		    $form{'uname'}=$form{'suname'};
  409: 		} else {
  410: 		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
  411: 		}
  412: 	    }
  413: 	} else {
  414: 	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
  415: 	}
  416:     }
  417: 
  418:     my ($is_balancer,$otherserver) = 
  419:         &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
  420: 
  421:     if ($is_balancer) {
  422:         if (!$otherserver) { 
  423:             ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
  424:         }
  425:         if ($otherserver) {
  426:             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
  427:                      \%form);
  428: 	    $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
  429:         } else {
  430:             $r->print(&noswitch());
  431:         }
  432:         return OK;
  433:     } else {
  434:         if (!&check_can_host($r,\%form,$authhost)) {
  435:             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
  436:             if ($otherserver) {
  437:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
  438:                          \%form);
  439:                 $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
  440:             } else {
  441:                 $r->print(&noswitch());
  442:             }
  443:             return OK;
  444:         }
  445: 
  446: # ------------------------------------------------------- Do the load balancing
  447: 
  448: # ---------------------------------------------------------- Determine own load
  449:         my $loadlim = $r->dir_config('lonLoadLim');
  450:         my $loadavg;
  451:         {
  452:             my $loadfile=Apache::File->new('/proc/loadavg');
  453:             $loadavg=<$loadfile>;
  454:         }
  455:         $loadavg =~ s/\s.*//g;
  456:         my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
  457:         my $userloadpercent=&Apache::lonnet::userload();
  458: 
  459: # ---------------------------------------------------------- Are we overloaded?
  460:         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
  461:             my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
  462:             if (!$unloaded) {
  463:                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
  464:             }
  465:             if ($unloaded) {
  466:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
  467:                          undef,\%form);
  468:                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
  469:                 return OK;
  470:             }
  471:         }
  472:         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
  473:                  \%form);
  474:         return OK;
  475:     }
  476: }
  477: 
  478: sub check_can_host {
  479:     my ($r,$form,$authhost,$domdesc) = @_;
  480:     return unless (ref($form) eq 'HASH');
  481:     my $canhost = 1;
  482:     my $lonhost = $r->dir_config('lonHostID');
  483:     my $udom = $form->{'udom'};
  484:     my @intdoms;
  485:     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
  486:     if (ref($internet_names) eq 'ARRAY') {
  487:         @intdoms = @{$internet_names};
  488:     }
  489:     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
  490:     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
  491:     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
  492:         my $machine_dom = &Apache::lonnet::host_domain($lonhost);
  493:         my $hostname = &Apache::lonnet::hostname($lonhost);
  494:         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
  495:         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
  496:         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
  497:         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
  498:         my $loncaparev;
  499:         if ($authhost eq 'no_account_on_host') {
  500:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
  501:         } else {
  502:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
  503:         }
  504:         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
  505:                                                      $udomdefaults{'remotesessions'},
  506:                                                      $defdomdefaults{'hostedsessions'});
  507:     }
  508:     unless ($canhost) {
  509:         if ($authhost eq 'no_account_on_host') {
  510:             my $checkloginvia = 1;
  511:             my ($login_host,$hostname) = 
  512:                 &Apache::lonnet::choose_server($udom,$checkloginvia);
  513:             &Apache::loncommon::content_type($r,'text/html');
  514:             $r->send_http_header;
  515:             if ($login_host ne '') {
  516:                 my $protocol = $Apache::lonnet::protocol{$login_host};
  517:                 $protocol = 'http' if ($protocol ne 'https');
  518:                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
  519:                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
  520:                           '<h3>'.&mt('Account creation').'</h3>'.
  521:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
  522:                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
  523:                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
  524:                           &Apache::loncommon::end_page());
  525:             } else {
  526:                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
  527:                           '<h3>'.&mt('Account creation unavailable').'</h3>'.
  528:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
  529:                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
  530:                           &Apache::loncommon::end_page());
  531:             }
  532:         } else {
  533:             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
  534:                      $form);
  535:             my ($otherserver) = &Apache::lonnet::choose_server($udom);
  536:             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
  537:         }
  538:     }
  539:     return $canhost;
  540: }
  541: 
  542: sub noswitch {
  543:     my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
  544:                  '<h3>'.&mt('Session unavailable').'</h3>'.
  545:                  &mt('This LON-CAPA server is unable to host your session.').'<br />'.
  546:                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
  547:                  &Apache::loncommon::end_page();
  548:     return $result;
  549: }
  550: 
  551: 1;
  552: __END__
  553: 
  554: 

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