Annotation of loncom/auth/lonauth.pm, revision 1.101.8.8

1.1       albertel    1: # The LearningOnline Network
                      2: # User Authentication Module
1.27      www         3: #
1.101.8.8! raeburn     4: # $Id: lonauth.pm,v 1.101.8.7 2011/09/27 20:18:45 raeburn Exp $
1.27      www         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: #
1.1       albertel   28: 
                     29: package Apache::lonauth;
                     30: 
1.18      albertel   31: use strict;
1.78      albertel   32: use LONCAPA;
1.1       albertel   33: use Apache::Constants qw(:common);
                     34: use CGI qw(:standard);
1.26      harris41   35: use DynaLoader; # for Crypt::DES version
1.8       www        36: use Crypt::DES;
1.45      matthew    37: use Apache::loncommon();
1.66      albertel   38: use Apache::lonnet;
1.12      www        39: use Apache::lonmenu();
1.90      raeburn    40: use Apache::createaccount;
1.18      albertel   41: use Fcntl qw(:flock);
1.56      www        42: use Apache::lonlocal;
1.101.8.8! raeburn    43: use Apache::File();
1.101     raeburn    44: use HTML::Entities;
1.85      albertel   45:  
1.1       albertel   46: # ------------------------------------------------------------ Successful login
1.85      albertel   47: sub success {
                     48:     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
                     49: 	$form) = @_;
1.1       albertel   50: 
1.85      albertel   51: # ------------------------------------------------------------ Get cookie ready
                     52:     my $cookie =
                     53: 	&Apache::loncommon::init_user_environment($r, $username, $domain,
                     54: 						  $authhost, $form,
1.86      albertel   55: 						  {'extra_env' => $extra_env,});
1.4       www        56: 
1.69      albertel   57:     my $public=($username eq 'public' && $domain eq 'public');
                     58: 
1.85      albertel   59:     if ($public or $lowerurl eq 'noredirect') { return $cookie; }
1.78      albertel   60: 
1.7       www        61: # -------------------------------------------------------------------- Log this
                     62: 
                     63:     &Apache::lonnet::log($domain,$username,$authhost,
                     64:                          "Login $ENV{'REMOTE_ADDR'}");
1.4       www        65: 
1.14      www        66: # ------------------------------------------------- Check for critical messages
                     67: 
1.21      www        68:     my @what=&Apache::lonnet::dump('critical',$domain,$username);
1.14      www        69:     if ($what[0]) {
1.22      www        70: 	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
1.21      www        71: 	    $lowerurl='/adm/email?critical=display';
1.14      www        72:         }
                     73:     }
                     74: 
1.5       www        75: # ------------------------------------------------------------ Get cookie ready
1.1       albertel   76:     $cookie="lonID=$cookie; path=/";
1.12      www        77: # -------------------------------------------------------- Menu script and info
1.100     raeburn    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:         if (exists($env{$envkey})) {
                     86:             my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
                     87:             &Apache::lonnet::role_status($envkey,$then,$refresh,$now,\$role,\$where,
                     88:                                          \$trolecode,\$tstatus,\$tstart,\$tend);
                     89:             if ($tstatus eq 'is') {
1.101     raeburn    90:                 $destination  .= ($destination =~ /\?/) ? '&' : '?';
                     91:                 my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
                     92:                 $destination .= 'selectrole=1&'.$newrole.'=1';
1.100     raeburn    93:             }
                     94:         }
                     95:     }
1.101     raeburn    96:     if (defined($form->{symb})) {
                     97:         my $destsymb = $form->{symb};
                     98:         $destination  .= ($destination =~ /\?/) ? '&' : '?';
                     99:         if ($destsymb =~ /___/) {
                    100:             # FIXME Need to deal with encrypted symbs and urls as needed.
                    101:             my ($map,$resid,$desturl)=split(/___/,$destsymb);
                    102:             unless ($desturl=~/^(adm|uploaded|editupload|public)/) {
                    103:                 $desturl = &Apache::lonnet::clutter($desturl);
                    104:             }
                    105:             $desturl = &HTML::Entities::encode($desturl,'"<>&');
                    106:             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
                    107:             $destination .= '&destinationurl='.$desturl.
                    108:                             '&destsymb='.$destsymb;
                    109:         } else {
                    110:             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
                    111:             $destination .= '&destinationurl='.$destsymb;
                    112:         }
                    113:     }
1.100     raeburn   114: 
1.85      albertel  115:     my $windowinfo=&Apache::lonmenu::open($env{'browser.os'});
1.100     raeburn   116:     my $startupremote=&Apache::lonmenu::startupremote($destination);
1.63      albertel  117:     my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
1.35      www       118:     my $setflags=&Apache::lonmenu::setflags();
                    119:     my $maincall=&Apache::lonmenu::maincall();
1.99      bisitz    120:     my $brcrum = [{'href' => '',
                    121:                    'text' => 'Successful Login'},];
1.74      albertel  122:     my $start_page=&Apache::loncommon::start_page('Successful Login',
1.99      bisitz    123:                                                   $startupremote,
                    124:                                                   {'no_inline_link' => 1,
                    125:                                                    'bread_crumbs' => $brcrum,});
1.74      albertel  126:     my $end_page  =&Apache::loncommon::end_page();
                    127: 
1.64      albertel  128:     my $continuelink;
1.98      www       129:     if ($env{'environment.remote'} eq 'off') {
1.100     raeburn   130: 	$continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>';
1.64      albertel  131:     }
1.5       www       132: # ------------------------------------------------- Output for successful login
                    133: 
1.74      albertel  134:     &Apache::loncommon::content_type($r,'text/html');
                    135:     $r->header_out('Set-cookie' => $cookie);
                    136:     $r->send_http_header;
1.1       albertel  137: 
1.58      www       138:     my %lt=&Apache::lonlocal::texthash(
                    139: 				       'wel' => 'Welcome',
1.92      bisitz    140: 				       'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up.',
                    141: 				       'pro' => 'Login problems?',
1.58      www       142: 				       'log' => 'loginproblems.html',
                    143: 				       );
1.1       albertel  144:     $r->print(<<ENDSUCCESS);
1.74      albertel  145: $start_page
1.35      www       146: $setflags
1.19      www       147: $windowinfo
1.58      www       148: <h1>$lt{'wel'}</h1>
1.92      bisitz    149: $lt{'mes'}<p>
                    150: <a href="/adm/$lt{'log'}">$lt{'pro'}</a></p>
1.63      albertel  151: $remoteinfo
1.35      www       152: $maincall
1.64      albertel  153: $continuelink
1.74      albertel  154: $end_page
1.1       albertel  155: ENDSUCCESS
                    156: }
                    157: 
                    158: # --------------------------------------------------------------- Failed login!
                    159: 
                    160: sub failed {
1.85      albertel  161:     my ($r,$message,$form) = @_;
1.76      albertel  162:     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,
                    163: 						    {'no_inline_link' => 1,});
1.100     raeburn   164:     my $retry = '/adm/login?username='.$form->{'uname'}.
                    165:                 '&domain='.$form->{'udom'};
                    166:     if (exists($form->{role})) {
                    167:         $retry .= '&role='.$form->{role};
                    168:     }
                    169:     if (exists($form->{symb})) {
                    170:         $retry .= '&symb='.$form->{symb};
                    171:     }
1.74      albertel  172:     my $end_page   = &Apache::loncommon::end_page();
                    173:     &Apache::loncommon::content_type($r,'text/html');
                    174:     $r->send_http_header;
1.92      bisitz    175:     $r->print(
                    176:        $start_page
                    177:       .'<h1>'.&mt('Sorry ...').'</h1>'
1.95      bisitz    178:       .'<p class="LC_warning">'.&mt($message).'</p>'
1.100     raeburn   179:       .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>')
1.92      bisitz    180:       .'</p>'
                    181:       .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
                    182:       .$end_page
                    183:     );
                    184:  }
1.60      www       185: 
1.55      www       186: # ------------------------------------------------------------------ Rerouting!
                    187: 
                    188: sub reroute {
1.74      albertel  189:     my ($r) = @_;
                    190:     &Apache::loncommon::content_type($r,'text/html');
                    191:     $r->send_http_header;
1.92      bisitz    192:     my $msg='<h1>'.&mt('Sorry ...').'</h1>'
                    193:            .&mt('Please [_1]log in again[_2].');
1.74      albertel  194:     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
1.55      www       195: }
                    196: 
1.1       albertel  197: # ---------------------------------------------------------------- Main handler
                    198: 
                    199: sub handler {
                    200:     my $r = shift;
1.85      albertel  201:     my $form;
1.55      www       202: # Are we re-routing?
                    203:     if (-e '/home/httpd/html/lon-status/reroute.txt') {
                    204: 	&reroute($r);
                    205: 	return OK;
                    206:     }
1.56      www       207: 
1.57      www       208:     &Apache::lonlocal::get_language_handle($r);
1.1       albertel  209: 
1.59      www       210: # -------------------------------- Prevent users from attempting to login twice
1.89      albertel  211:     my $handle = &Apache::lonnet::check_for_valid_session($r);
                    212:     if ($handle ne '') {
1.101.8.1  raeburn   213:         my $lonidsdir=$r->dir_config('lonIDsDir');
                    214:         if ($handle=~/^publicuser\_/) {
                    215: # For "public user" - remove it, we apparently really want to login
                    216:             unlink($r->dir_config('lonIDsDir')."/$handle.id");
                    217:         } else {
1.59      www       218: # Indeed, a valid token is found
1.101.8.1  raeburn   219:             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
                    220:             &Apache::loncommon::content_type($r,'text/html');
                    221:             $r->send_http_header;
                    222:             my $start_page =
                    223:                 &Apache::loncommon::start_page('Already logged in');
                    224:             my $end_page =
                    225:                 &Apache::loncommon::end_page();
                    226:             my $dest = '/adm/roles';
                    227:             if ($env{'form.firsturl'} ne '') {
                    228:                 $dest = $env{'form.firsturl'};
                    229:             }
                    230:             $r->print(
                    231:                $start_page
                    232:               .'<h1>'.&mt('You are already logged in!').'</h1>'
                    233:               .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
                    234:                     ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>')
                    235:               .'</p>'
                    236:               .$end_page
                    237:             );
                    238:             return OK;
                    239:         }
1.59      www       240:     }
                    241: 
                    242: # ---------------------------------------------------- No valid token, continue
                    243: 
                    244: 
1.1       albertel  245:     my $buffer;
1.84      albertel  246:     if ($r->header_in('Content-length') > 0) {
                    247: 	$r->read($buffer,$r->header_in('Content-length'),0);
                    248:     }
1.85      albertel  249:     my %form;
                    250:     foreach my $pair (split(/&/,$buffer)) {
                    251:        my ($name,$value) = split(/=/,$pair);
1.7       www       252:        $value =~ tr/+/ /;
                    253:        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1.85      albertel  254:        $form{$name}=$value;
1.1       albertel  255:     } 
                    256: 
1.85      albertel  257:     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
                    258: 	&failed($r,'Username, password and domain need to be specified.',
                    259: 		\%form);
1.1       albertel  260:         return OK;
                    261:     }
1.61      www       262: 
                    263: # split user logging in and "su"-user
                    264: 
1.85      albertel  265:     ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
1.87      albertel  266:     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
                    267:     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
                    268:     $form{'udom'}  = &LONCAPA::clean_domain(  $form{'udom'});
1.1       albertel  269: 
                    270:     my $role   = $r->dir_config('lonRole');
                    271:     my $domain = $r->dir_config('lonDefDomain');
                    272:     my $prodir = $r->dir_config('lonUsersDir');
1.93      raeburn   273:     my $contact_name = &mt('LON-CAPA helpdesk');
1.1       albertel  274: 
1.8       www       275: # ---------------------------------------- Get the information from login token
                    276: 
1.85      albertel  277:     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
                    278:                                       $form{'serverid'});
1.8       www       279: 
1.101.8.7  raeburn   280:     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
                    281:        ($tmpinfo eq 'no_such_host')) {
1.85      albertel  282: 	&failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
1.8       www       283:         return OK;
1.44      www       284:     } else {
1.85      albertel  285: 	my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
                    286: 					   $form{'serverid'});
1.77      albertel  287:         if ( $reply ne 'ok' ) {
1.85      albertel  288:             &failed($r,'Session could not be opened.',\%form);
                    289: 	    &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
1.77      albertel  290: 	    return OK;
1.44      www       291: 	}
1.8       www       292:     }
1.100     raeburn   293: 
1.93      raeburn   294:     if (!&Apache::lonnet::domain($form{'udom'})) {
                    295:         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
                    296:         return OK;
                    297:     }
1.100     raeburn   298: 
                    299:     my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo);
                    300:     if ($rolestr) {
                    301:         $rolestr = &unescape($rolestr);
                    302:     }
                    303:     if ($symbstr) {
                    304:         $symbstr= &unescape($symbstr);
                    305:     }
                    306:     if ($rolestr =~ /^role=/) {
                    307:         (undef,$form{'role'}) = split('=',$rolestr);
                    308:     }
                    309:     if ($symbstr =~ /^symb=/) { 
                    310:         (undef,$form{'symb'}) = split('=',$symbstr);
                    311:     }
1.8       www       312: 
                    313:     my $keybin=pack("H16",$key);
                    314: 
1.26      harris41  315:     my $cipher;
                    316:     if ($Crypt::DES::VERSION>=2.03) {
                    317: 	$cipher=new Crypt::DES $keybin;
                    318:     }
                    319:     else {
                    320: 	$cipher=new DES $keybin;
                    321:     }
1.67      www       322:     my $upass='';
                    323:     for (my $i=0;$i<=2;$i++) {
                    324: 	my $chunk=
1.85      albertel  325: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16))));
1.8       www       326: 
1.67      www       327: 	$chunk.=
1.85      albertel  328: 	    $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16))));
1.8       www       329: 
1.67      www       330: 	$chunk=substr($chunk,1,ord(substr($chunk,0,1)));
                    331: 	$upass.=$chunk;
                    332:     }
1.8       www       333: 
1.1       albertel  334: # ---------------------------------------------------------------- Authenticate
1.101.8.8! raeburn   335: 
1.90      raeburn   336:     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
1.101.8.8! raeburn   337:     my ($cancreate,$statustocreate) =
        !           338:         &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
1.90      raeburn   339:     my $defaultauth;
1.101.8.8! raeburn   340:     if (ref($cancreate) eq 'ARRAY') {
        !           341:         if (grep(/^login$/,@{$cancreate})) {
        !           342:             $defaultauth = 1;
        !           343:         }
1.90      raeburn   344:     }
1.101.8.2  raeburn   345:     my $clientcancheckhost = 1;
1.90      raeburn   346:     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
1.101.8.2  raeburn   347:                                               $form{'udom'},$defaultauth,
                    348:                                               $clientcancheckhost);
1.1       albertel  349:     
                    350: # --------------------------------------------------------------------- Failed?
                    351: 
                    352:     if ($authhost eq 'no_host') {
1.85      albertel  353: 	&failed($r,'Username and/or password could not be authenticated.',
                    354: 		\%form);
1.1       albertel  355:         return OK;
1.90      raeburn   356:     } elsif ($authhost eq 'no_account_on_host') {
1.101.8.8! raeburn   357:         if ($defaultauth) {
1.101.8.2  raeburn   358:             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
1.101.8.5  raeburn   359:             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
1.101.8.8! raeburn   360:                 return OK;
1.101.8.5  raeburn   361:             }
1.90      raeburn   362:             my $start_page = 
                    363:                 &Apache::loncommon::start_page('Create a user account in LON-CAPA',
                    364:                                                '',{'no_inline_link'   => 1,});
1.93      raeburn   365:             my $lonhost = $r->dir_config('lonHostID');
                    366:             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
                    367:             my $contacts = 
                    368:                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
                    369:                                                         $form{'udom'},$origmail);
                    370:             my ($contact_email) = split(',',$contacts); 
1.101.8.8! raeburn   371:             my $output =
        !           372:                 &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
        !           373:                                                        $domdesc,'',$lonhost,
        !           374:                                                        $contact_email,$contact_name,
        !           375:                                                        undef,$statustocreate);
1.90      raeburn   376:             &Apache::loncommon::content_type($r,'text/html');
                    377:             $r->send_http_header;
                    378:             &Apache::createaccount::print_header($r,$start_page);
1.94      raeburn   379:             $r->print('<h3>'.&mt('Account creation').'</h3>'.
                    380:                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
                    381:                       $output.&Apache::loncommon::end_page());
1.90      raeburn   382:             return OK;
                    383:         } else {
                    384:             &failed($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);
                    385:             return OK;
                    386:         }
1.1       albertel  387:     }
                    388: 
1.59      www       389:     if (($firsturl eq '') || 
                    390: 	($firsturl=~/^\/adm\/(logout|remote)/)) {
1.24      www       391: 	$firsturl='/adm/roles';
1.7       www       392:     }
1.61      www       393: # --------------------------------- Are we attempting to login as somebody else?
1.85      albertel  394:     if ($form{'suname'}) {
1.61      www       395: # ------------ see if the original user has enough privileges to pull this stunt
1.85      albertel  396: 	if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
1.61      www       397: # ---------------------------------------------------- see if the su-user exists
1.85      albertel  398: 	    unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
1.61      www       399: 		eq 'no_host') {
1.85      albertel  400: 		&Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
1.61      www       401: # ------------------------------ see if the su-user is not too highly privileged
1.85      albertel  402: 		unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
1.61      www       403: # -------------------------------------------------------- actually switch users
1.85      albertel  404: 		    &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
                    405: 			' logging in as '.$form{'suname'});
                    406: 		    $form{'uname'}=$form{'suname'};
1.61      www       407: 		} else {
                    408: 		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
                    409: 		}
                    410: 	    }
                    411: 	} else {
                    412: 	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
                    413: 	}
                    414:     }
1.85      albertel  415: 
1.81      albertel  416:     if ($r->dir_config("lonBalancer") eq 'yes') {
1.101.8.6  raeburn   417:         my $otherserver = &Apache::lonnet::spareserver(30000,undef,1,$form{'udom'});
1.101.8.7  raeburn   418:         if (!$otherserver) {
                    419:             ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
                    420:         }
                    421:         if ($otherserver) {
                    422:             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                    423:                      \%form);
                    424:             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
                    425:         } else {
                    426:             $r->print(&noswitch());
                    427:         }
1.101.8.5  raeburn   428:         return OK;
1.81      albertel  429:     } else {
1.101.8.7  raeburn   430:         if (!&check_can_host($r,\%form,$authhost)) {
                    431:             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
                    432:             if ($otherserver) {
                    433:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
                    434:                          \%form);
                    435:                 $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl);
                    436:             } else {
                    437:                 $r->print(&noswitch());
                    438:             }
                    439:             return OK;
                    440:         }
1.101.8.4  raeburn   441: # ------------------------------------------------------- Do the load balancing
                    442: 
                    443: # ---------------------------------------------------------- Determine own load
                    444:         my $loadlim = $r->dir_config('lonLoadLim');
                    445:         my $loadavg;
                    446:         {
                    447:             my $loadfile=Apache::File->new('/proc/loadavg');
                    448:             $loadavg=<$loadfile>;
                    449:         }
                    450:         $loadavg =~ s/\s.*//g;
                    451:         my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
                    452:         my $userloadpercent=&Apache::lonnet::userload();
                    453: 
                    454: # ---------------------------------------------------------- Are we overloaded?
                    455:         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
                    456:             my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
1.101.8.7  raeburn   457:             if (!$unloaded) {
                    458:                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
                    459:             }
1.101.8.4  raeburn   460:             if ($unloaded) {
                    461:                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
                    462:                          undef,\%form);
                    463:                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
1.101.8.5  raeburn   464:                 return OK;
1.101.8.4  raeburn   465:             }
                    466:         }
                    467:         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
                    468:                  \%form);
1.101.8.5  raeburn   469:         return OK;
1.81      albertel  470:     }
1.1       albertel  471: }
                    472: 
1.101.8.2  raeburn   473: sub check_can_host {
                    474:     my ($r,$form,$authhost,$domdesc) = @_;
                    475:     return unless (ref($form) eq 'HASH');
                    476:     my $canhost = 1;
                    477:     my $lonhost = $r->dir_config('lonHostID');
                    478:     my $udom = $form->{'udom'};
1.101.8.3  raeburn   479:     my @intdoms;
                    480:     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
                    481:     if (ref($internet_names) eq 'ARRAY') {
                    482:         @intdoms = @{$internet_names};
                    483:     }
1.101.8.2  raeburn   484:     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
                    485:     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
                    486:     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
                    487:         my $machine_dom = &Apache::lonnet::host_domain($lonhost);
                    488:         my $hostname = &Apache::lonnet::hostname($lonhost);
                    489:         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
                    490:         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
                    491:         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
                    492:         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
                    493:         my $loncaparev;
                    494:         if ($authhost eq 'no_account_on_host') {
                    495:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
                    496:         } else {
                    497:             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
                    498:         }
                    499:         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
                    500:                                                      $udomdefaults{'remotesessions'},
                    501:                                                      $defdomdefaults{'hostedsessions'});
                    502:     }
                    503:     unless ($canhost) {
                    504:         if ($authhost eq 'no_account_on_host') {
1.101.8.7  raeburn   505:             my $checkloginvia = 1;
                    506:             my ($login_host,$hostname) =
                    507:                 &Apache::lonnet::choose_server($udom,$checkloginvia);
1.101.8.2  raeburn   508:             &Apache::loncommon::content_type($r,'text/html');
                    509:             $r->send_http_header;
                    510:             if ($login_host ne '') {
                    511:                 my $protocol = $Apache::lonnet::protocol{$login_host};
                    512:                 $protocol = 'http' if ($protocol ne 'https');
                    513:                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
                    514:                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
                    515:                           '<h3>'.&mt('Account creation').'</h3>'.
                    516:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                    517:                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
                    518:                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
                    519:                           &Apache::loncommon::end_page());
                    520:             } else {
                    521:                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    522:                           '<h3>'.&mt('Account creation unavailable').'</h3>'.
                    523:                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
                    524:                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
                    525:                           &Apache::loncommon::end_page());
                    526:             }
                    527:         } else {
                    528:             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
                    529:                      $form);
                    530:             my ($otherserver) = &Apache::lonnet::choose_server($udom);
                    531:             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
                    532:         }
                    533:     }
1.101.8.5  raeburn   534:     return $canhost;
1.101.8.2  raeburn   535: }
                    536: 
1.101.8.7  raeburn   537: sub noswitch {
                    538:     my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
                    539:                  '<h3>'.&mt('Session unavailable').'</h3>'.
                    540:                  &mt('This LON-CAPA server is unable to host your session.').'<br />'.
                    541:                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
                    542:                  &Apache::loncommon::end_page();
                    543:     return $result;
                    544: }
                    545: 
1.1       albertel  546: 1;
                    547: __END__
1.7       www       548: 
                    549: 

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