# The LearningOnline Network # Login Screen # # $Id: lonlogin.pm,v 1.106.4.5 2010/02/09 17:49:15 raeburn Exp $ # # Copyright Michigan State University Board of Trustees # # This file is part of the LearningOnline Network with CAPA (LON-CAPA). # # LON-CAPA is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # LON-CAPA is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with LON-CAPA; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # /home/httpd/html/adm/gpl.txt # # http://www.lon-capa.org/ # package Apache::lonlogin; use strict; use Apache::Constants qw(:common); use Apache::File (); use Apache::lonnet; use Apache::loncommon(); use Apache::lonauth(); use Apache::lonlocal; use Apache::migrateuser(); use lib '/home/httpd/lib/perl/'; use LONCAPA; sub handler { my $r = shift; &Apache::loncommon::get_unprocessed_cgi (join('&',$ENV{'QUERY_STRING'},$env{'request.querystring'}, $ENV{'REDIRECT_QUERY_STRING'}), ['interface','username','domain','firsturl','localpath','localres', 'token','role','symb']); if (!defined($env{'form.firsturl'})) { &Apache::lonacc::get_posted_cgi($r,['firsturl']); } # -- check if they are a migrating user if (defined($env{'form.token'})) { return &Apache::migrateuser::handler($r); } &Apache::loncommon::no_cache($r); &Apache::lonlocal::get_language_handle($r); &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; return OK if $r->header_only; # Are we re-routing? if (-e '/home/httpd/html/lon-status/reroute.txt') { &Apache::lonauth::reroute($r); return OK; } # -------------------------------- Prevent users from attempting to login twice my $handle = &Apache::lonnet::check_for_valid_session($r); if ($handle=~/^publicuser\_/) { # For "public user" - remove it, we apparently really want to login unlink($r->dir_config('lonIDsDir')."/$handle.id"); } elsif ($handle ne '') { # Indeed, a valid token is found my $start_page = &Apache::loncommon::start_page('Already logged in'); my $end_page = &Apache::loncommon::end_page(); my $dest = '/adm/roles'; if ($env{'form.firsturl'} ne '') { $dest = $env{'form.firsturl'}; } $r->print( $start_page .'
'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].', '','','','').'
' .'' .$end_page ); return OK; } # ---------------------------------------------------- No valid token, continue # ---------------------------- Not possible to really login to domain "public" if ($env{'form.domain'} eq 'public') { $env{'form.domain'}=''; $env{'form.username'}=''; } # ----------------------------------------------------------- Process Interface $env{'form.interface'}=~s/\W//g; my $textbrowsers=$r->dir_config('lonTextBrowsers'); my $httpbrowser=$ENV{"HTTP_USER_AGENT"}; foreach (split(/\:/,$textbrowsers)) { if ($httpbrowser=~/$_/i) { $env{'form.interface'}='textual'; } } my $fullgraph=($env{'form.interface'} ne 'textual'); my $iconpath= &Apache::loncommon::lonhttpdurl($r->dir_config('lonIconsURL')); my $domain = &Apache::lonnet::default_login_domain(); if (($env{'form.domain'}) && (&Apache::lonnet::domain($env{'form.domain'},'description'))) { $domain=$env{'form.domain'}; } my $role = $r->dir_config('lonRole'); my $loadlim = $r->dir_config('lonLoadLim'); my $servadm = $r->dir_config('lonAdmEMail'); my $lonhost = $r->dir_config('lonHostID'); my $tabdir = $r->dir_config('lonTabDir'); my $include = $r->dir_config('lonIncludes'); my $expire = $r->dir_config('lonExpire'); my $version = $r->dir_config('lonVersion'); my $host_name = &Apache::lonnet::hostname($lonhost); # --------------------------------------------- Default values for login fields my $authusername=($env{'form.username'}?$env{'form.username'}:''); my $authdomain=($env{'form.domain'}?$env{'form.domain'}:$domain); # ---------------------------------------------------------- Determine own load my $loadavg; { my $loadfile=Apache::File->new('/proc/loadavg'); $loadavg=<$loadfile>; } $loadavg =~ s/\s.*//g; my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim); my $userloadpercent=&Apache::lonnet::userload(); # ------------------------------------------------------- Do the load balancing my $otherserver= &Apache::lonnet::absolute_url($host_name); my $firsturl= ($env{'request.firsturl'}?$env{'request.firsturl'}:$env{'form.firsturl'}); # ---------------------------------------------------------- Are we overloaded? if ((($userloadpercent>100.0)||($loadpercent>100.0))) { my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent); if ($unloaded) { $otherserver=$unloaded; } } # ----------------------------------------------------------- Get announcements my $announcements=&Apache::lonnet::getannounce(); # -------------------------------------------------------- Set login parameters my @hexstr=('0','1','2','3','4','5','6','7', '8','9','a','b','c','d','e','f'); my $lkey=''; for (0..7) { $lkey.=$hexstr[rand(15)]; } my $ukey=''; for (0..7) { $ukey.=$hexstr[rand(15)]; } my $lextkey=hex($lkey); if ($lextkey>2147483647) { $lextkey-=4294967296; } my $uextkey=hex($ukey); if ($uextkey>2147483647) { $uextkey-=4294967296; } # -------------------------------------------------------- Store away log token my $tokenextras; if ($env{'form.role'}) { $tokenextras = '&role='.&escape($env{'form.role'}); } if ($env{'form.symb'}) { if (!$tokenextras) { $tokenextras = '&'; } $tokenextras .= '&symb='.&escape($env{'form.symb'}); } my $logtoken=Apache::lonnet::reply( 'tmpput:'.$ukey.$lkey.'&'.$firsturl.$tokenextras, $lonhost); # ------------------- If we cannot talk to ourselves, we are in serious trouble if ($logtoken eq 'con_lost') { my $spares=''; my $last; foreach my $hostid (sort { &Apache::lonnet::hostname($a) cmp &Apache::lonnet::hostname($b); } keys(%Apache::lonnet::spareid)) { next if ($hostid eq $lonhost); my $hostname = &Apache::lonnet::hostname($hostid); next if ($last eq $hostname); $spares.=''.&mt('Please attempt to login to one of the following servers:').'
' .$spares .'' .'' ); return OK; } # ----------------------------------------------- Apparently we are in business $servadm=~s/\,/\
HEADER
if ($showbanner) {
$r->print(< | |||||||||||
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ENDSTART
if ($showmainlogo) {
$r->print(<![]() | |||||||||
ENDTOP
} else {
$r->print('The LearningOnline Network with CAPA' .''.&mt('Text-based Interface Login').'' .$announcements); } $r->print(' ENDLOGIN if ($fullgraph) { my $helpdeskscript; my $contactblock = &contactdisplay(\%lt,$servadm,$showadminmail, $version,$authdomain,\$helpdeskscript); $r->print(<![]() $announcements |
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$contactblock |
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$domainlogo | ![]() |
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