--- loncom/auth/lonlogin.pm	2008/01/24 15:06:21	1.100
+++ loncom/auth/lonlogin.pm	2024/09/18 15:11:31	1.208
@@ -1,695 +1,1412 @@
-# The LearningOnline Network
-# Login Screen
-#
-# $Id: lonlogin.pm,v 1.100 2008/01/24 15:06:21 bisitz 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'},
-	      $ENV{'REDIRECT_QUERY_STRING'}),
-	 ['interface','username','domain','firsturl','localpath','localres',
-	  'token']);
-
-# -- check if they are a migrating user
-    if (defined($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();
-	$r->print(
-                  $start_page
-                 .'<h1>'.&mt('You are already logged in').'</h1>'
-                 .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]logout[_4].',
-                  '<a href="/adm/roles">','</a>','<a href="/adm/logout">','</a>').'</p>'
-                 .'<p><a href="/adm/loginproblems.html">'.&mt('Login problems?').'</a></p>'
-                 .$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 $logtoken=Apache::lonnet::reply(
-       'tmpput:'.$ukey.$lkey.'&'.$firsturl,
-       $lonhost);
-
-# ------------------- If we cannot talk to ourselves, we are in serious trouble
-
-    if ($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.='<br /><font size="+1"><a href="http://'.
-                $hostname.
-                '/adm/login?domain='.$authdomain.'">'.
-                $hostname.'</a>'.
-                ' (preferred)</font>'.$/;
-	    $last=$hostname;
-        }
-        $spares.= '<br />';
-	my %all_hostnames = &Apache::lonnet::all_hostnames();
-        foreach my $hostid (sort
-			    {
-				&Apache::lonnet::hostname($a) cmp
-				    &Apache::lonnet::hostname($b);
-			    }
-			    keys(%all_hostnames)) {
-            next if ($hostid eq $lonhost || $Apache::lonnet::spareid{$hostid});
-	    my $hostname = &Apache::lonnet::hostname($hostid);
-            next if ($last eq $hostname);
-            $spares.='<br /><a href="http://'.
-                $hostname.
-                '/adm/login?domain='.$authdomain.'">'.
-                $hostname.'</a>';
-	    $last=$hostname;
-        }
-	$r->print(<<ENDTROUBLE);
-<html>
-<head><title>The LearningOnline Network with CAPA</title></head>
-<body bgcolor="#FFFFFF">
-<img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />
-<h3>This LON-CAPA server is temporarily not available for login</h3>
-<p>Please attempt to login to one of the following servers:</p>$spares
-</body>
-</html>
-ENDTROUBLE
-        return OK;
-    }
-
-# ----------------------------------------------- Apparently we are in business
-    $servadm=~s/\,/\<br \/\>/g;
-
-# ----------------------------------------------------------- Front page design
-    my $pgbg=
-      ($fullgraph?&Apache::loncommon::designparm('login.pgbg',$domain):'#FFFFFF');
-    my $font=
-      ($fullgraph?&Apache::loncommon::designparm('login.font',$domain):'#000000');
-    my $link=
-      ($fullgraph?&Apache::loncommon::designparm('login.link',$domain):'#0000FF');
-    my $vlink=
-      ($fullgraph?&Apache::loncommon::designparm('login.vlink',$domain):'#0000FF');
-    my $alink=&Apache::loncommon::designparm('login.alink',$domain);
-    my $mainbg=
-      ($fullgraph?&Apache::loncommon::designparm('login.mainbg',$domain):'#FFFFFF');
-    my $sidebg=
-      ($fullgraph?&Apache::loncommon::designparm('login.sidebg',$domain):'#FFFFFF');
-    my $textcol = 
-      ($fullgraph?&Apache::loncommon::designparm('login.textcol',$domain):'#000000');
-    my $bgcol =
-      ($fullgraph?&Apache::loncommon::designparm('login.bgcol',$domain):'#FFFFFF');
-    my $logo=&Apache::loncommon::designparm('login.logo',$domain);
-    my $img=&Apache::loncommon::designparm('login.img',$domain);
-    my $domainlogo=&Apache::loncommon::domainlogo($domain);
-    my $login=&Apache::loncommon::designparm('login.login',$domain);
-    if ($login eq '') {
-        $login = $iconpath.'/'.&mt('userauthentication.gif');
-    }
-    my $showadminmail=&Apache::loncommon::designparm('login.adminmail',$domain);
-    my $showcoursecat =
-        &Apache::loncommon::designparm('login.coursecatalog',$domain);
-    my $loginheader =&Apache::loncommon::designparm('login.loginheader',$domain);
-    my $now=time;
-    my $js = (<<ENDSCRIPT);
-
- <script language="JavaScript">
-    function send()
-    {
-        this.document.server.elements.uname.value
-       =this.document.client.elements.uname.value;
-
-        this.document.server.elements.udom.value
-       =this.document.client.elements.udom.value;
-
-        this.document.server.elements.imagesuppress.value
-       =this.document.client.elements.imagesuppress.checked;
-
-        this.document.server.elements.embedsuppress.value
-       =this.document.client.elements.embedsuppress.checked;
-
-        this.document.server.elements.appletsuppress.value
-       =this.document.client.elements.appletsuppress.checked;
-
-        this.document.server.elements.fontenhance.value
-       =this.document.client.elements.fontenhance.checked;
-
-        this.document.server.elements.blackwhite.value
-       =this.document.client.elements.blackwhite.checked;
-
-        this.document.server.elements.remember.value
-       =this.document.client.elements.remember.checked;
-
-        uextkey=this.document.client.elements.uextkey.value;
-        lextkey=this.document.client.elements.lextkey.value;
-        initkeys();
-
-        this.document.server.elements.upass0.value
-            =crypted(this.document.client.elements.upass$now.value.substr(0,15));
-        this.document.server.elements.upass1.value
-            =crypted(this.document.client.elements.upass$now.value.substr(15,15));
-        this.document.server.elements.upass2.value
-            =crypted(this.document.client.elements.upass$now.value.substr(30,15));
-
-        this.document.client.elements.uname.value='';
-        this.document.client.elements.upass$now.value='';
-
-        this.document.server.submit();
-        return false;
-    }
- </script>
-
-ENDSCRIPT
-
-# --------------------------------------------------- Print login screen header
-
-    my %add_entries = (topmargin    => "0",
-                       leftmargin   => "0",
-                       marginheight => "0",
-                       marginwidth  => "0",
-                       bgcolor      => "$pgbg",
-                       text         => "$font",
-                       link         => "$link",
-                       vlink        => "$vlink",
-                       alink        => "$alink",);
-
-    $r->print(&Apache::loncommon::start_page('The LearningOnline Network with CAPA Login',$js,
-                                       { 'redirect'       => [$expire,'/adm/roles'], 
-                                         'add_entries' => \%add_entries,
-                                         'only_body'   => 1,}));
-
-# ----------------------------------------------------------------------- Texts
-
-my %lt=&Apache::lonlocal::texthash(
-		  'un'  => 'Username',
-		  'pw'  => 'Password',
-		  'dom' => 'Domain',
-		  'perc' => 'percent',
-		  'load' => 'Load',
-                  'userload' => 'User Load',
-                  'about'  => 'About LON-CAPA',
-                  'access' => 'Accessibility Options',
-                  'catalog' => 'Course Catalog',
-		  'log' => 'Log in',
-		  'help' => 'Log-in Help',
-		  'serv' => 'Server',
-                  'servadm' => 'Server Administration',
-                  'helpdesk' => 'Contact Helpdesk',
-                  'forgotpw' => 'Forgot password?',
-                  'options_headline' => 'Select Accessibility Options',
-                  'sprs_img' => 'Suppress rendering of images',
-                  'sprs_applet' => 'Suppress Java applets',
-                  'sprs_embed' => 'Suppress rendering of embedded multimedia',
-                  'sprs_font' => 'Increase font size',
-                  'sprs_blackwhite' => 'Switch to black and white mode',
-                  'remember' => 'Remember these settings for next login');
-# -------------------------------------------------- Change password field name
-    my $forgotpw = &forgotpwdisplay(%lt);
-    my $loginhelp = &loginhelpdisplay(%lt);
-
-# ---------------------------------------------------- Serve out DES JavaScript
-    {
-        my $jsh=Apache::File->new($include."/londes.js");
-        $r->print(<$jsh>);
-    }
-# ---------------------------------------------------------- Serve rest of page
-
-    if ($fullgraph) {
-	$r->print(
-		  '<table width="100%" cellpadding=0 cellspacing=0 border=0>');
-    }
-
-    $r->print(<<ENDSERVERFORM);
-  <form name="server" action="$otherserver/adm/authenticate" method="post" target="_top">
-   <input type="hidden" name="logtoken" value="$logtoken" />
-   <input type="hidden" name="serverid" value="$lonhost" />
-   <input type="hidden" name="interface" value="$env{'form.interface'}" />
-   <input type="hidden" name="uname" value="" />
-   <input type="hidden" name="upass0" value="" />
-   <input type="hidden" name="upass1" value="" />
-   <input type="hidden" name="upass2" value="" />
-   <input type="hidden" name="udom" value="" />
-   <input type="hidden" name="imagesuppress"  value="" />
-   <input type="hidden" name="appletsuppress"  value="" />
-   <input type="hidden" name="embedsuppress"  value="" />
-   <input type="hidden" name="fontenhance"  value="" />
-   <input type="hidden" name="blackwhite"  value="" />
-   <input type="hidden" name="remember"  value="" />
-   <input type="hidden" name="localpath" value="$env{'form.localpath'}" />
-   <input type="hidden" name="localres" value="$env{'form.localres'}" />
-  </form>
-ENDSERVERFORM
-    my $coursecatalog;
-    if (($showcoursecat eq '') || ($showcoursecat)) {
-        $coursecatalog = &coursecatalog_link($lt{'catalog'});
-    }
-    if ($fullgraph) { $r->print(<<ENDTOP);
-  <!-- The LON-CAPA Header -->
-  <tr>
-
-   <!-- Row 1 Columns 2-4 -->
-   <td width="100%" height=75 colspan=4 align="left" valign="top" bgcolor="$pgbg"><img src="$img" border=0 alt="The Learning Online Network with CAPA" /></td>
-  </tr>
-
-  <!-- The gray bar that starts the two table frames -->
-  <tr>
-
-   <!-- Row 2 Column 1 -->
-   <td width=182 height=27 bgcolor="$sidebg">&nbsp;</td>
-
-   <!-- Row 2 Column 2 -->
-   <td width=27 height=27 align="left" background="$iconpath/filltop.gif"><img src="$iconpath/upperleft.gif" border=0 alt="" /></td>
-
-   <!-- Row 2 Column 3 -->
-   <td height=27 background="$iconpath/filltop.gif"><img src="$iconpath/filltop.gif" alt="" /></td>
-
-   <!-- Row 2 Column 4 -->
-   <td width=27 height=27 align="right" background="$iconpath/filltop.gif"><img src="$iconpath/upperright.gif" border=0 alt="" /></td>
-  </tr>
-  <tr>
-   
-   <!-- A cell that will hold the 'access', 'about', and 'catalog' links -->
-   <!-- Row 3 Column 1 -->
-   <td valign="top" height="60" align="left" bgcolor="$sidebg">
-    <table cellpadding="0" cellspacing="2" border="0">
-     <tr>
-      <td>&nbsp;</td>
-      <td><a href="/adm/login?interface=textual"><b>$lt{'access'}</b></a></td>
-     </tr>
-     <tr>
-      <td>&nbsp;</td>
-      <td><a href="/adm/about.html"><b>$lt{'about'}</b></a></td>
-     </tr>$coursecatalog
-     <tr>
-      <td colspan="2">&nbsp;</td>
-     </tr>
-    </table>
-   </td>
-   <!-- The shaded space between the two main columns -->
-   <!-- Row 3 Column 2 -->
-   <td width=27 height=60 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
-
-   <!-- The right main column holding the large LON-CAPA logo-->
-   <!-- Rows 3-4 Column 3 -->
-   <td align="center" valign="top" width="100%" height="100%" bgcolor="$mainbg">
-    <center>
-     <img src="$logo" alt="" />
-    </center>
-   </td>
-
-   <!-- Row 3 Column 4 -->
-   <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
-  </tr>
-  <tr>
-
-   <!-- The entry form -->
-   <!-- Row 4 Column 1 -->
-   <td align="center" valign="middle" bgcolor="$sidebg">
-ENDTOP
-} else {
-    $r->print('<h1>The Learning<i>Online</i> Network with CAPA</h1>'
-             .'<h2>'.&mt('Text-based Interface Login').'</h2>'
-             .$announcements);
-}
-    $r->print('<form name="client" onsubmit="return(send())">');
-    unless ($fullgraph) {
-        $r->print(<<ENDACCESSOPTIONS);
-<h3>$lt{'options_headline'}</h3>
-<label><input type="checkbox" name="imagesuppress" /> $lt{'sprs_img'}</label><br />
-<label><input type="checkbox" name="appletsuppress" /> $lt{'sprs_applet'}</label><br />
-<label><input type="checkbox" name="embedsuppress" /> $lt{'sprs_embed'}</label><br />
-<label><input type="checkbox" name="fontenhance" /> $lt{'sprs_font'}</label><br />
-<label><input type="checkbox" name="blackwhite" /> $lt{'sprs_blackwhite'}</label><br />
-<br />
-<input type="checkbox" name="remember" /> $lt{'remember'}<hr />
-ENDACCESSOPTIONS
-} else {
-    $r->print(<<ENDNOOPT);
-<input type="hidden" name="imagesuppress"  value="" />
-<input type="hidden" name="embedsuppress"  value="" />
-<input type="hidden" name="appletsuppress"  value="" />
-<input type="hidden" name="fontenhance"  value="" />
-<input type="hidden" name="blackwhite"  value="" />
-<input type="hidden" name="remember"  value="" />
-ENDNOOPT
-}
-    my $logintitle;
-    if ($loginheader eq 'text') {
-        $logintitle = '<td bgcolor="'.$bgcol.'" colspan="2">&nbsp;&nbsp;&nbsp;<b><font size="+1" color="'.$textcol.'">'.$lt{'log'}.'</font></b></td>';
-    } else {
-        $logintitle = '<td bgcolor="'.$sidebg.'" colspan="2"><img src="'.$login.'" alt="'.
-                      &mt('User Authentication').'" /></td>';
-    }
-    $r->print(<<ENDLOGIN);
-     <input type="hidden" name="lextkey" value="$lextkey">
-     <input type="hidden" name="uextkey" value="$uextkey">
-
-     <!-- Start the sub-table for text and input alignment -->
-     <table border=0 cellspacing=0 cellpadding=0>
-      <tr>$logintitle</tr>
-      <tr>
-       <td bgcolor="$mainbg"><br /><font size=-1><b>&nbsp;&nbsp;&nbsp;<label for="uname">$lt{'un'}</label>:</b></font></td>
-       <td bgcolor="$mainbg"><br /><input type="text" name="uname" size="10" value="$authusername" /></td>
-      </tr>
-      <tr>
-       <td bgcolor="$mainbg"><font size=-1><b>&nbsp;&nbsp;&nbsp;<label for="upass$now">$lt{'pw'}</label>:</b></font></td>
-       <td bgcolor="$mainbg"><input type="password" name="upass$now" size="10" /></td>
-      </tr>
-      <tr>
-       <td bgcolor="$mainbg"><font size=-1><b>&nbsp;&nbsp;&nbsp;<label for="udom">$lt{'dom'}</label>:</b></font></td>
-       <td bgcolor="$mainbg"><input type="text" name="udom" size="10" value="$authdomain" /></td>
-      </tr>
-      <tr>
-       <td bgcolor="$mainbg">&nbsp;</td>
-       <td bgcolor="$mainbg" valign="bottom" align="center">
-        <br />
-        <input type="submit" value="$lt{'log'}" />
-       </td>
-      </tr>
-      <tr>
-       <td bgcolor="$mainbg" valign="bottom" align="left" colspan="2">
-        $loginhelp
-        $forgotpw
-       </td>
-      </tr>
-     </table>
-     <!-- End sub-table -->
-    </form>
-ENDLOGIN
-    if ($fullgraph) {
-        my $helpdeskscript;
-        my $contactblock = &contactdisplay(\%lt,$servadm,$showadminmail,
-                                  $version,$authdomain,\$helpdeskscript);
-	$r->print(<<ENDDOCUMENT);
-   </td>
-
-   <!-- Row 4 Column 2 -->
-   <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
-
-   <!-- Row 4 Column 3 -->
-<td bgcolor="$mainbg">$announcements</td>
-
-   <!-- Row 4 Column 4 -->
-   <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
-  </tr>
-  <tr>
-
-   <!-- Row 5 Column 1 -->
-   <td bgcolor="$sidebg" valign="middle" align="left">
-     <br />
-     <table border=0 cellspacing=0 cellpadding=0>
-      <tr>
-       <td bgcolor="$sidebg" align="left" valign="top">
-        <small><b>&nbsp;&nbsp;&nbsp;$lt{'dom'}:&nbsp;</b></small>
-       </td>
-       <td bgcolor="$sidebg" align="left" valign="top">
-        <small><tt>&nbsp;$domain</tt></small>
-       </td>
-      </tr>
-      <tr>
-       <td bgcolor="$sidebg" align="left" valign="top">
-        <small><b>&nbsp;&nbsp;&nbsp;$lt{'serv'}:&nbsp;</b></small>
-       </td>
-       <td bgcolor="$sidebg" align="left" valign="top">
-        <small><tt>&nbsp;$lonhost ($role)</tt></small>
-       </td>
-      </tr>
-      <tr>
-       <td bgcolor="$sidebg" align="left" valign="top">
-        <small><b>&nbsp;&nbsp;&nbsp;$lt{'load'}:&nbsp;</b></small>
-       </td>
-       <td bgcolor="$sidebg" align="left" valign="top">
-        <small><tt>&nbsp;$loadpercent $lt{'perc'}</tt></small>
-       </td>
-      </tr>
-      <tr>
-       <td bgcolor="$sidebg" align="left" valign="top">
-        <small><b>&nbsp;&nbsp;&nbsp;$lt{'userload'}:&nbsp;</b></small>
-       </td>
-       <td bgcolor="$sidebg" align="left" valign="top">
-        <small><tt>&nbsp;$userloadpercent $lt{'perc'}</tt></small>
-       </td>
-      </tr>
-     </table>
-     <br />
-    $contactblock
-   </td>
-
-   <!-- Row 5 Column 2 -->
-   <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
-
-   <!-- Row 5 Column 3 -->
-   <td width="100%" valign="bottom" bgcolor="$mainbg">
-$domainlogo
-</td>
-
-   <!-- Row 5 Column 4 -->
-   <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
-  </tr>
-  <tr>
-
-   <!-- Row 6 Column 1 -->
-   <td bgcolor="$sidebg">&nbsp;</td>
-
-   <!-- Row 6 Column 2 -->
-   <td align="left" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerleft.gif" alt="" /></td>
-
-   <!-- Row 6 Column 3 -->
-   <td background="$iconpath/fillbottom.gif"><img src="$iconpath/fillbottom.gif" alt="" /></td>
-
-   <!-- Row 6 Column 4 -->
-   <td align="right" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerright.gif" alt="" /></td>
-  </tr>
- </table>
-
-<script type="text/javascript">
-// the if prevents the script error if the browser can not handle this
-if ( document.client.uname ) { document.client.uname.focus(); }
-</script>
-$helpdeskscript
-
-ENDDOCUMENT
-}
-    my %endargs = ( 'noredirectlink' => 1, );
-    $r->print(&Apache::loncommon::end_page(\%endargs));
-    return OK;
-}
-
-sub contactdisplay {
-    my ($lt,$servadm,$showadminmail,$version,$authdomain,$helpdeskscript) = @_;
-    my $contactblock;
-    my $showhelpdesk = 0;
-    my $requestmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
-    if ($requestmail =~ m/^[^\@]+\@[^\@]+$/) {
-        $showhelpdesk = 1;
-    }
-    if ($servadm && $showadminmail) {
-        $contactblock .= '<b>&nbsp;&nbsp;&nbsp;'.$$lt{'servadm'}.':</b><br />'.
-                         '<tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'.$servadm.'</tt><br />&nbsp;<br />';
-    }
-    if ($showhelpdesk) {
-        $contactblock .= '<b>&nbsp;&nbsp;&nbsp;<a href="javascript:helpdesk()"><font size="+1">'.$lt->{'helpdesk'}.'</font></a></b><br />';
-        my $thisurl = &escape('/adm/login');
-        $$helpdeskscript = <<"ENDSCRIPT";
-<script type="text/javascript">
-function helpdesk() {
-    var codedom = document.client.udom.value;
-    if (codedom == '') {
-        codedom = "$authdomain";
-    }
-    var querystr = "origurl=$thisurl&codedom="+codedom;
-    document.location.href = "/adm/helpdesk?"+querystr;
-    return;
-}
-</script>
-ENDSCRIPT
-    }
-    $contactblock .= <<"ENDBLOCK";
-     &nbsp;&nbsp;&nbsp;$version
-ENDBLOCK
-    return $contactblock;
-}
-
-sub forgotpwdisplay {
-    my (%lt) = @_;
-    my $prompt_for_resetpw = 1; 
-    if ($prompt_for_resetpw) {
-        return '<br />&nbsp;&nbsp;&nbsp;<a href="/adm/resetpw">'.$lt{'forgotpw'}.'</a></b><br /><br />';
-    }
-    return;
-}
-
-sub loginhelpdisplay {
-    my (%lt) = @_;
-    my $login_help = 1;
-    if ($login_help) {
-        return '&nbsp;&nbsp;&nbsp;<a href="/adm/loginproblems.html">'.$lt{'help'}.'</a></b>';
-    }
-    return;
-}
-
-sub coursecatalog_link {
-    my ($linkname) = @_;
-    return <<"END";
-     <tr>
-      <td>&nbsp;</td>
-      <td><a href="/adm/coursecatalog"><b>$linkname</b></a></td>
-     </tr>
-END
-}
-
-1;
-__END__
+# The LearningOnline Network
+# Login Screen
+#
+# $Id: lonlogin.pm,v 1.208 2024/09/18 15:11:31 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 qw(:DEFAULT :match);
+use URI::Escape;
+use HTML::Entities();
+use CGI::Cookie();
+ 
+sub handler {
+    my $r = shift;
+
+    &Apache::loncommon::get_unprocessed_cgi
+	(join('&',$ENV{'QUERY_STRING'},$env{'request.querystring'},
+	      $ENV{'REDIRECT_QUERY_STRING'}),
+	 ['interface','username','domain','firsturl','localpath','localres',
+	  'token','role','symb','iptoken','btoken','ltoken','ttoken','linkkey',
+          'saml','sso','retry','display']); 
+
+# -- check if they are a migrating user
+    if (defined($env{'form.token'})) {
+        return &Apache::migrateuser::handler($r);
+    }
+
+    my $lonhost = $r->dir_config('lonHostID');
+    if ($env{'form.ttoken'}) {
+        my %info = &Apache::lonnet::tmpget($env{'form.ttoken'});
+        &Apache::lonnet::tmpdel($env{'form.ttoken'});
+        if ($info{'origurl'}) {
+            $env{'form.firsturl'} = $info{'origurl'};
+        }
+        if ($info{'ltoken'}) {
+            $env{'form.ltoken'} = $info{'ltoken'};
+        } elsif ($info{'linkprot'}) {
+            $env{'form.linkprot'} = $info{'linkprot'};
+            foreach my $item ('linkprotuser','linkprotexit','linkprotpbid','linkprotpburl') {
+                if ($info{$item} ne '') {
+                    $env{'form.'.$item} = $info{$item};
+                }
+            }
+        } elsif ($info{'linkkey'} ne '') {
+            $env{'form.linkkey'} = $info{'linkkey'};
+        }
+    } elsif (($env{'form.sso'}) || ($env{'form.retry'})) {
+        my $infotoken;
+        if ($env{'form.sso'}) {
+            $infotoken = $env{'form.sso'};
+        } else {
+            $infotoken = $env{'form.retry'};
+        }
+        my $data = &Apache::lonnet::reply('tmpget:'.$infotoken,$lonhost);
+        unless (($data=~/^error/) || ($data eq 'con_lost') ||
+                ($data eq 'no_such_host')) {
+            my %info = &decode_token($data);
+            foreach my $item (keys(%info)) {
+                $env{'form.'.$item} = $info{$item};
+            }
+            &Apache::lonnet::tmpdel($infotoken);
+        }
+    } else {
+        if (!defined($env{'form.firsturl'})) {
+            &Apache::lonacc::get_posted_cgi($r,['firsturl']);
+        }
+        if (!defined($env{'form.firsturl'})) {
+            if ($ENV{'REDIRECT_URL'} =~ m{^/+tiny/+$LONCAPA::match_domain/+\w+$}) {
+                $env{'form.firsturl'} = $ENV{'REDIRECT_URL'};
+            }
+        }
+        if (($env{'form.firsturl'} =~ m{^/+tiny/+$LONCAPA::match_domain/+\w+$}) &&
+            (!$env{'form.ltoken'}) && (!$env{'form.linkprot'}) && (!$env{'form.linkkey'})) {
+            &Apache::lonacc::get_posted_cgi($r,['linkkey']);
+        }
+        if ($env{'form.firsturl'} eq '/adm/logout') {
+            delete($env{'form.firsturl'});
+        }
+    }
+
+# For "public user" - remove any exising "public" cookie, as user really wants to log-in
+    my ($handle,$lonidsdir,$expirepub,$userdom);
+    $lonidsdir=$r->dir_config('lonIDsDir');
+    unless ($r->header_only) {
+        $handle = &Apache::lonnet::check_for_valid_session($r,'lonID',undef,\$userdom);
+        if ($handle ne '') {
+            if ($handle=~/^publicuser\_/) {
+                unlink($r->dir_config('lonIDsDir')."/$handle.id");
+                undef($handle);
+                undef($userdom);
+                $expirepub = 1;
+            }
+        }
+    }
+
+    &Apache::loncommon::no_cache($r);
+    &Apache::lonlocal::get_language_handle($r);
+    &Apache::loncommon::content_type($r,'text/html');
+    if ($expirepub) {
+        my $c = new CGI::Cookie(-name    => 'lonPubID',
+                                -value   => '',
+                                -expires => '-10y',);
+        $r->header_out('Set-cookie' => $c);
+    } elsif (($handle eq '') && ($userdom ne '')) {
+        my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
+        foreach my $name (keys(%cookies)) {
+            next unless ($name =~ /^lon(|S|Link|Pub)ID$/);
+            my $c = new CGI::Cookie(-name    => $name,
+                                    -value   => '',
+                                    -expires => '-10y',);
+            $r->headers_out->add('Set-cookie' => $c);
+        }
+    }
+    $r->send_http_header;
+    return OK if $r->header_only;
+
+
+# Are we re-routing?
+    my $londocroot = $r->dir_config('lonDocRoot'); 
+    if (-e "$londocroot/lon-status/reroute.txt") {
+	&Apache::lonauth::reroute($r);
+	return OK;
+    }
+
+# Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
+
+    my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r,1);
+    if ($found_server) {
+        my $hostname = &Apache::lonnet::hostname($found_server);
+        if ($hostname ne '') {
+            my $protocol = $Apache::lonnet::protocol{$found_server};
+            $protocol = 'http' if ($protocol ne 'https');
+            my $dest = '/adm/roles';
+            if ($env{'form.firsturl'} ne '') {
+                $dest = &HTML::Entities::encode($env{'form.firsturl'},'\'"<>&');
+            }
+            my %info = (
+                         balcookie => $lonhost.':'.$balancer_cookie,
+                       );
+            if ($env{'form.role'}) {
+                $info{'role'} = $env{'form.role'};
+            }
+            if ($env{'form.symb'}) {
+                $info{'symb'} = $env{'form.symb'};
+            }
+            if (($env{'form.firsturl'} eq '/adm/email') && ($env{'form.display'} ne '')) {
+                if ($env{'form.sso'}) {
+                    if ($env{'form.mailrecip'}) {
+                        $info{'display'} = &escape($env{'form.display'});
+                        $info{'mailrecip'} = &escape($env{'form.mailrecip'});
+                    }
+                } else {
+                    if (($env{'form.username'}) && ($env{'form.domain'})) {
+                        $info{'display'} = &escape($env{'form.display'});
+                        $info{'mailrecip'} = &escape($env{'form.username'}.':'.$env{'form.domain'});
+                    }
+                }
+            }
+            my $balancer_token = &Apache::lonnet::tmpput(\%info,$found_server);
+            unless (($balancer_token eq 'con_lost') || ($balancer_token eq 'refused') ||
+                    ($balancer_token eq 'unknown_cmd') || ($balancer_token eq 'no_such_host')) {
+                $dest .=  (($dest=~/\?/)?'&amp;':'?') . 'btoken='.$balancer_token;
+            }
+            if ($env{'form.firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+                my %link_info;
+                if ($env{'form.ltoken'}) {
+                    $link_info{'ltoken'} = $env{'form.ltoken'};
+                } elsif ($env{'form.linkprot'}) {
+                    $link_info{'linkprot'} = $env{'form.linkprot'};
+                    foreach my $item ('linkprotuser','linkprotexit','linkprotpbid','linkprotpburl') {
+                        if ($env{'form.'.$item} ne '') {
+                            $link_info{$item} = $env{'form.'.$item};
+                        }
+                    }
+                } elsif ($env{'form.linkkey'} ne '') {
+                    $link_info{'linkkey'} = $env{'form.linkkey'};
+                }
+                if (keys(%link_info)) {
+                    $link_info{'origurl'} = $env{'form.firsturl'};
+                    my $token = &Apache::lonnet::tmpput(\%link_info,$found_server,'link');
+                    unless (($token eq 'con_lost') || ($token eq 'refused') ||
+                            ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
+                        $dest .=  (($dest=~/\?/)?'&amp;':'?') . 'ttoken='.$token;
+                    }
+                }
+            }
+            unless ($found_server eq $lonhost) {
+                my $alias = &Apache::lonnet::use_proxy_alias($r,$found_server);
+                $hostname = $alias if ($alias ne '');
+            }
+            my $url = $protocol.'://'.$hostname.$dest;
+            my $start_page =
+                &Apache::loncommon::start_page('Switching Server ...',undef,
+                                               {'redirect'       => [0,$url],});
+            my $end_page   = &Apache::loncommon::end_page();
+            $r->print($start_page.$end_page);
+            return OK;
+        }
+    }
+
+#
+# Check if a LON-CAPA load balancer sent user here because user's browser sent
+# it a balancer cookie for an active session on this server.
+#
+
+    my $balcookie;
+    if ($env{'form.btoken'}) {
+        my %info = &Apache::lonnet::tmpget($env{'form.btoken'});
+        $balcookie = $info{'balcookie'};
+        &Apache::lonnet::tmpdel($env{'form.btoken'});
+        delete($env{'form.btoken'});
+        if (($env{'form.firsturl'} eq '/adm/email') &&
+            (exists($info{'display'})) && (exists($info{'mailrecip'}))) {
+            $env{'form.display'} = &unescape($info{'display'});
+            $env{'form.mailrecip'} = &unescape($info{'mailrecip'});
+        }
+    }
+
+#
+# If browser sent an old cookie for which the session file had been removed
+# check if configuration for user's domain has a portal URL set.  If so
+# switch user's log-in to the portal.
+#
+
+    if (($handle eq '') && ($userdom ne '')) {
+        my %domdefaults = &Apache::lonnet::get_domain_defaults($userdom);
+        if ($domdefaults{'portal_def'} =~ /^https?\:/) {
+            my $start_page = &Apache::loncommon::start_page('Switching Server ...',undef,
+                                          {'redirect' => [0,$domdefaults{'portal_def'}],});
+            my $end_page   = &Apache::loncommon::end_page();
+            $r->print($start_page.$end_page);
+            return OK;
+        }
+    }
+
+# -------------------------------- Prevent users from attempting to login twice
+    if ($handle ne '') {
+        &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
+	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 '') {
+            $dest = &HTML::Entities::encode($env{'form.firsturl'},'\'"<>&');
+        }
+        if (($env{'form.ltoken'}) || ($env{'form.linkprot'})) {
+            my ($linkprot,$linkprotuser,$linkprotexit,$linkprotpbid,$linkprotpburl);
+            if ($env{'form.ltoken'}) {
+                my %info = &Apache::lonnet::tmpget($env{'form.ltoken'});
+                $linkprot = $info{'linkprot'};
+                if ($info{'linkprotuser'} ne '') {
+                    $linkprotuser = $info{'linkprotuser'};
+                }
+                if ($info{'linkprotexit'} ne '') {
+                    $linkprotexit = $info{'linkprotexit'};
+                }
+                if ($info{'linkprotpbid'} ne '') {
+                    $linkprotpbid = $info{'linkprotpbid'};
+                }
+                if ($info{'linkprotpburl'} ne '') {
+                    $linkprotpburl = $info{'linkprotpburl'};
+                }
+            } else {
+                $linkprot = $env{'form.linkprot'};
+                $linkprotuser = $env{'form.linkprotuser'};
+                $linkprotexit = $env{'form.linkprotexit'};
+                $linkprotpbid = $env{'form.linkprotpbid'};
+                $linkprotpburl = $env{'form.linkprotpburl'}; 
+            }
+            if ($linkprot) {
+                my ($linkprotector,$deeplink) = split(/:/,$linkprot,2);
+                if (($deeplink =~ m{^/tiny/$match_domain/\w+$}) &&
+                    ($linkprotuser ne '') && ($linkprotuser ne $env{'user.name'}.':'.$env{'user.domain'})) {
+                    my $ip = &Apache::lonnet::get_requestor_ip();
+                    my %linkprotinfo = (
+                                          origurl => $deeplink,
+                                          linkprot => $linkprot,
+                                          linkprotuser => $linkprotuser,
+                                          linkprotexit => $linkprotexit,
+                                          linkprotpbid => $linkprotpbid,
+                                          linkprotpburl => $linkprotpburl,
+                                       );
+                    if ($env{'form.ltoken'}) {
+                        my $delete = &Apache::lonnet::tmpdel($env{'form.ltoken'});
+                    }
+                    &Apache::migrateuser::logout($r,$ip,$handle,undef,undef,\%linkprotinfo);
+                    return OK;
+                }
+                if ($env{'user.linkprotector'}) {
+                    my @protectors = split(/,/,$env{'user.linkprotector'});
+                    unless (grep(/^\Q$linkprotector\E$/,@protectors)) {
+                        push(@protectors,$linkprotector);
+                        @protectors = sort { $a <=> $b } @protectors;
+                        &Apache::lonnet::appenv({'user.linkprotector' => join(',',@protectors)});
+                    }
+                } else {
+                    &Apache::lonnet::appenv({'user.linkprotector' => $linkprotector });
+                }
+                if ($env{'user.linkproturi'}) {
+                    my @proturis = split(/,/,$env{'user.linkproturi'});
+                    unless (grep(/^\Q$deeplink\E$/,@proturis)) {
+                        push(@proturis,$deeplink);
+                        @proturis = sort @proturis;
+                        &Apache::lonnet::appenv({'user.linkproturi' => join(',',@proturis)});
+                    }
+                } else {
+                    &Apache::lonnet::appenv({'user.linkproturi' => $deeplink});
+                }
+            }
+        } elsif ($env{'form.linkkey'} ne '') {
+            if ($env{'form.firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+                my $linkkey = $env{'form.linkkey'};
+                if ($env{'user.deeplinkkey'}) {
+                    my @linkkeys = split(/,/,$env{'user.deeplinkkey'});
+                    unless (grep(/^\Q$linkkey\E$/,@linkkeys)) {
+                        push(@linkkeys,$linkkey);
+                        &Apache::lonnet::appenv({'user.deeplinkkey' => join(',',sort(@linkkeys))});
+                    }
+                } else {
+                    &Apache::lonnet::appenv({'user.deeplinkkey' => $linkkey});
+                }
+                my $deeplink = $env{'form.firsturl'}; 
+                if ($env{'user.keyedlinkuri'}) {
+                    my @keyeduris = split(/,/,$env{'user.keyedlinkuri'});
+                    unless (grep(/^\Q$deeplink\E$/,@keyeduris)) {
+                        push(@keyeduris,$deeplink);
+                        &Apache::lonnet::appenv({'user.keyedlinkuri' => join(',',sort(@keyeduris))});
+                    }
+                } else {
+                    &Apache::lonnet::appenv({'user.keyedlinkuri' => $deeplink});
+                }
+            }
+        }
+        if ($env{'form.ltoken'}) {
+            my $delete = &Apache::lonnet::tmpdel($env{'form.ltoken'});
+        }
+        if (($env{'form.firsturl'} eq '/adm/email') && ($env{'form.display'})) {
+            if ($env{'form.mailrecip'}) {
+                if ($env{'form.mailrecip'} eq "$env{'user.name'}:$env{'user.domain'}") {
+                    $dest .= (($dest=~/\?/)?'&amp;':'?') . 'display='.&escape($env{'form.display'}).
+                                                           '&amp;mailrecip='.&escape($env{'form.mailrecip'});
+                }
+            } elsif (($env{'form.username'} eq $env{'user.name'}) && ($env{'form.domain'} eq $env{'user.domain'})) {
+                $dest .= (($dest=~/\?/)?'&amp;':'?') . 'display='.&escape($env{'form.display'}).
+                                                       '&amp;mailrecip='.&escape("$env{'user.name'}:$env{'form.domain'}");
+            }
+        }
+	$r->print(
+                  $start_page
+                 .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
+                 .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].',
+                  '<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>').'</p>'
+                 .$end_page
+                 );
+        return OK;
+    }
+
+# ---------------------------------------------------- No valid token, continue
+
+# ---------------------------- Not possible to really login to domain "public"
+    if ($env{'form.domain'} eq 'public') {
+	$env{'form.domain'}='';
+	$env{'form.username'}='';
+    }
+
+# ------ Is this page requested because /adm/migrateuser detected an IP change?
+    my %sessiondata;
+    if ($env{'form.iptoken'}) {
+        %sessiondata = &Apache::lonnet::tmpget($env{'form.iptoken'});
+        unless ($sessiondata{'sessionserver'}) {
+            my $delete = &Apache::lonnet::tmpdel($env{'form.iptoken'});
+            delete($env{'form.iptoken'});
+        }
+    }
+# ----------------------------------------------------------- Process Interface
+    $env{'form.interface'}=~s/\W//g;
+
+    (undef,undef,undef,undef,undef,undef,my $clientmobile) =
+        &Apache::loncommon::decode_user_agent($r);
+
+    my $iconpath= 
+	&Apache::loncommon::lonhttpdurl($r->dir_config('lonIconsURL'));
+
+    my $domain = &Apache::lonnet::default_login_domain();
+    my $defdom = $domain;
+    if ($lonhost ne '') {
+        unless ($sessiondata{'sessionserver'}) {
+            my $redirect = &check_loginvia($domain,$lonhost,$lonidsdir,$balcookie);
+            if ($redirect) {
+                $r->print($redirect);
+                return OK;
+            }
+        }
+    }
+
+    if (($sessiondata{'domain'}) &&
+        (&Apache::lonnet::domain($sessiondata{'domain'},'description'))) {
+        $domain=$sessiondata{'domain'};
+    } elsif (($env{'form.domain'}) && 
+	(&Apache::lonnet::domain($env{'form.domain'},'description'))) {
+	$domain=$env{'form.domain'};
+    }
+
+    my $role    = $r->dir_config('lonRole');
+    my $loadlim = $r->dir_config('lonLoadLim');
+    my $uloadlim= $r->dir_config('lonUserLoadLim');
+    my $servadm = $r->dir_config('lonAdmEMail');
+    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 ($authusername,$authdomain);
+    if ($sessiondata{'username'}) {
+        $authusername=$sessiondata{'username'};
+    } else {
+        $env{'form.username'} = &Apache::loncommon::cleanup_html($env{'form.username'});
+        $authusername=($env{'form.username'}?$env{'form.username'}:'');
+    }
+    if ($sessiondata{'domain'}) {
+        $authdomain=$sessiondata{'domain'};
+    } else {
+        $env{'form.domain'} = &Apache::loncommon::cleanup_html($env{'form.domain'});
+        $authdomain=($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,$userloadpercent);
+    if ($loadlim) {
+        $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
+    }
+    if ($uloadlim) {
+        $userloadpercent=&Apache::lonnet::userload();
+    }
+
+    my $firsturl=
+    ($env{'request.firsturl'}?$env{'request.firsturl'}:$env{'form.firsturl'});
+
+# ----------------------------------------------------------- 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,$tokentype,$linkprot_for_login);
+    my @names = ('role','symb','iptoken','ltoken','linkprotuser','linkprotexit',
+                 'linkprot','linkkey','display','linkprotpbid','linkprotpburl');
+    foreach my $name (@names) {
+        if ($env{'form.'.$name} ne '') {
+            if ($name eq 'ltoken') {
+                my %info = &Apache::lonnet::tmpget($env{'form.'.$name});
+                if ($info{'linkprot'}) {
+                    $linkprot_for_login = $info{'linkprot'};
+                    $tokenextras .= '&linkprot='.&escape($info{'linkprot'});
+                    foreach my $item ('linkprotuser','linkprotexit','linkprotpbid','linkprotpburl') {
+                        if ($info{$item}) {
+                            $tokenextras .= '&'.$item.'='.&escape($info{$item});
+                        }
+                    }
+                    $tokentype = 'link';
+                    last;
+                }
+            } elsif ($env{'form.display'} && ($env{'form.firsturl'} eq '/adm/email')) {
+                if (($env{'form.mailrecip'}) ||
+                    ($env{'form.username'} =~ /^$match_username$/) && ($env{'form.domain'} =~ /^$match_domain$/)) {
+                    $tokenextras .= '&'.$name.'='.&escape($env{'form.display'});
+                    if ($env{'form.mailrecip'}) {
+                        $tokenextras .= '&mailrecip='.&escape($env{'form.mailrecip'});
+                    } else {
+                        $tokenextras .= '&mailrecip='.&escape($env{'form.username'}.':'.$env{'form.domain'});
+                    }
+                }
+            } else {
+                $tokenextras .= '&'.$name.'='.&escape($env{'form.'.$name});
+                if (($name eq 'linkkey') || ($name eq 'linkprot')) {
+                    if ((($env{'form.retry'}) || ($env{'form.sso'})) && 
+                        (!$env{'form.ltoken'}) && ($name eq 'linkprot')) {
+                        $linkprot_for_login = $env{'form.linkprot'};
+                    }
+                    $tokentype = 'link';
+                }
+            }
+        }
+    }
+    if ($tokentype) {
+        $tokenextras .= ":$tokentype";
+    }
+    my $logtoken=Apache::lonnet::reply(
+       'tmpput:'.$ukey.$lkey.'&'.&escape($firsturl).$tokenextras,
+       $lonhost);
+
+# -- If we cannot talk to ourselves, or hostID does not map to a hostname
+#    we are in serious trouble
+
+    if (($logtoken eq 'con_lost') || ($logtoken eq 'no_such_host')) {
+        if ($logtoken eq 'no_such_host') {
+            &Apache::lonnet::logthis('No valid logtoken for log-in page -- unable to determine hostname for hostID: '.$lonhost.'. Check entry in hosts.tab');
+        }
+        if ($env{'form.ltoken'}) {
+            &Apache::lonnet::tmpdel($env{'form.ltoken'});
+            delete($env{'form.ltoken'});
+        }
+        my $spares='';
+        my (@sparehosts,%spareservers);
+        my $sparesref = &Apache::lonnet::this_host_spares($defdom);
+        if (ref($sparesref) eq 'HASH') {
+            foreach my $key (keys(%{$sparesref})) {
+                if (ref($sparesref->{$key}) eq 'ARRAY') {
+                    my @sorted = sort { &Apache::lonnet::hostname($a) cmp
+                                        &Apache::lonnet::hostname($b);
+                                      } @{$sparesref->{$key}};
+                    if (@sorted) {
+                        if ($key eq 'primary') {
+                            unshift(@sparehosts,@sorted);
+                        } elsif ($key eq 'default') {
+                            push(@sparehosts,@sorted);
+                        }
+                    }
+                }
+            }
+        }
+        foreach my $hostid (@sparehosts) {
+            next if ($hostid eq $lonhost);
+	    my $hostname = &Apache::lonnet::hostname($hostid);
+	    next if (($hostname eq '') || ($spareservers{$hostname}));
+            $spareservers{$hostname} = 1;
+            my $protocol = $Apache::lonnet::protocol{$hostid};
+            $protocol = 'http' if ($protocol ne 'https');
+            $spares.='<br /><span style="font-size: larger;"><a href="'.$protocol.'://'.
+                $hostname.
+                '/adm/login?domain='.$authdomain.'">'.
+                $hostname.'</a>'.
+                ' '.&mt('(preferred)').'</span>'.$/;
+        }
+        if ($spares) {
+            $spares.= '<br />';
+        }
+        my %all_hostnames = &Apache::lonnet::all_hostnames();
+        foreach my $hostid (sort
+		    {
+			&Apache::lonnet::hostname($a) cmp
+			    &Apache::lonnet::hostname($b);
+		    }
+		    keys(%all_hostnames)) {
+            next if ($hostid eq $lonhost);
+            my $hostname = &Apache::lonnet::hostname($hostid);
+            next if (($hostname eq '') || ($spareservers{$hostname}));
+            $spareservers{$hostname} = 1;
+            my $protocol = $Apache::lonnet::protocol{$hostid};
+            $protocol = 'http' if ($protocol ne 'https');
+            $spares.='<br /><a href="'.$protocol.'://'.
+	             $hostname.
+	             '/adm/login?domain='.$authdomain.'">'.
+	             $hostname.'</a>';
+         }
+         $r->print(
+   '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">'
+  .'<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">'
+  .'<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>'
+  .&mt('The LearningOnline Network with CAPA')
+  .'</title></head>'
+  .'<body bgcolor="#FFFFFF">'
+  .'<h1>'.&mt('The LearningOnline Network with CAPA').'</h1>'
+  .'<img src="/adm/lonKaputt/lonlogo_broken.gif" alt="broken icon" align="right" />'
+  .'<h3>'.&mt('This LON-CAPA server is temporarily not available for login.').'</h3>');
+        if ($spares) {
+            $r->print('<p>'.&mt('Please attempt to login to one of the following servers:')
+                     .'</p>'
+                     .$spares);
+        }
+        $r->print('</body>'
+                 .'</html>'
+        );
+        return OK;
+    }
+
+# ----------------------------------------------- Apparently we are in business
+    $servadm=~s/\,/\<br \/\>/g;
+
+# ----------------------------------------------------------- Front page design
+    my $pgbg=&Apache::loncommon::designparm('login.pgbg',$domain);
+    my $font=&Apache::loncommon::designparm('login.font',$domain);
+    my $link=&Apache::loncommon::designparm('login.link',$domain);
+    my $vlink=&Apache::loncommon::designparm('login.vlink',$domain);
+    my $alink=&Apache::loncommon::designparm('login.alink',$domain);
+    my $mainbg=&Apache::loncommon::designparm('login.mainbg',$domain);
+    my $loginbox_bg=&Apache::loncommon::designparm('login.sidebg',$domain);
+    my $loginbox_header_bgcol=&Apache::loncommon::designparm('login.bgcol',$domain);
+    my $loginbox_header_textcol=&Apache::loncommon::designparm('login.textcol',$domain);
+    my $logo=&Apache::loncommon::designparm('login.logo',$domain);
+    my $img=&Apache::loncommon::designparm('login.img',$domain);
+    my $domainlogo=&Apache::loncommon::domainlogo($domain);
+    my $showbanner = 1;
+    my $showmainlogo = 1;
+    if (defined(&Apache::loncommon::designparm('login.showlogo_img',$domain))) {
+        $showbanner = &Apache::loncommon::designparm('login.showlogo_img',$domain);
+    }
+    if (defined(&Apache::loncommon::designparm('login.showlogo_logo',$domain))) {
+        $showmainlogo = &Apache::loncommon::designparm('login.showlogo_logo',$domain);
+    }
+    my $showadminmail;
+    my @possdoms = &Apache::lonnet::current_machine_domains();
+    if (grep(/^\Q$domain\E$/,@possdoms)) {
+        $showadminmail=&Apache::loncommon::designparm('login.adminmail',$domain);
+    }
+    my $showcoursecat =
+        &Apache::loncommon::designparm('login.coursecatalog',$domain);
+    my $shownewuserlink = 
+        &Apache::loncommon::designparm('login.newuser',$domain);
+    my $showhelpdesk =
+        &Apache::loncommon::designparm('login.helpdesk',$domain);
+    my $now=time;
+    my $js = (<<ENDSCRIPT);
+
+<script type="text/javascript" language="JavaScript">
+// <![CDATA[
+function send()
+{
+this.document.server.elements.uname.value
+=this.document.client.elements.uname.value;
+
+this.document.server.elements.udom.value
+=this.document.client.elements.udom.value;
+
+uextkey=this.document.client.elements.uextkey.value;
+lextkey=this.document.client.elements.lextkey.value;
+initkeys();
+
+if(this.document.server.action.substr(0,5) === 'http:'){
+    this.document.server.elements.upass0.value
+        =getCrypted(this.document.client.elements.upass$now.value);
+} else {
+    this.document.server.elements.upass0.value
+        =this.document.client.elements.upass$now.value;
+}
+
+this.document.client.elements.uname.value='';
+this.document.client.elements.upass$now.value='';
+
+this.document.server.submit();
+return false;
+}
+
+function enableInput() {
+    this.document.client.elements.upass$now.removeAttribute("readOnly");
+    this.document.client.elements.uname.removeAttribute("readOnly");
+    this.document.client.elements.udom.removeAttribute("readOnly");
+    return;
+}
+
+// ]]>
+</script>
+
+ENDSCRIPT
+
+    my ($lonhost_in_use,@hosts,%defaultdomconf,$saml_prefix,$saml_landing,
+        $samlssotext,$samlnonsso,$samlssoimg,$samlssoalt,$samlssourl,$samltooltip,
+        $samlwindow);
+    %defaultdomconf = &Apache::loncommon::get_domainconf($defdom);
+    @hosts = &Apache::lonnet::current_machine_ids();
+    $lonhost_in_use = $lonhost;
+    if (@hosts > 1) {
+        foreach my $hostid (@hosts) {
+            if (&Apache::lonnet::host_domain($hostid) eq $defdom) {
+                $lonhost_in_use = $hostid;
+                last;
+            }
+        }
+    }
+    $saml_prefix = $defdom.'.login.saml_';
+    if ($defaultdomconf{$saml_prefix.$lonhost_in_use}) {
+        $saml_landing = 1;
+        $samlssotext = $defaultdomconf{$saml_prefix.'text_'.$lonhost_in_use};
+        $samlnonsso = $defaultdomconf{$saml_prefix.'notsso_'.$lonhost_in_use};
+        $samlssoimg = $defaultdomconf{$saml_prefix.'img_'.$lonhost_in_use};
+        $samlssoalt = $defaultdomconf{$saml_prefix.'alt_'.$lonhost_in_use};
+        $samlssourl = $defaultdomconf{$saml_prefix.'url_'.$lonhost_in_use};
+        $samltooltip = $defaultdomconf{$saml_prefix.'title_'.$lonhost_in_use};
+        $samlwindow = $defaultdomconf{$saml_prefix.'window_'.$lonhost_in_use};
+    }
+    if ($saml_landing) {
+       if ($samlssotext eq '') {
+           $samlssotext = 'SSO Login';
+       }
+       if ($samlnonsso eq '') {
+           $samlnonsso = 'Non-SSO Login';
+       }
+       $js .= <<"ENDSAMLJS";
+
+<script type="text/javascript">
+// <![CDATA[
+function toggleLClogin() {
+    if (document.getElementById('LC_standard_login')) {
+        if (document.getElementById('LC_standard_login').style.display == 'none') {
+            document.getElementById('LC_standard_login').style.display = 'inline-block';
+            if (document.getElementById('LC_login_text')) {
+                document.getElementById('LC_login_text').innerHTML = '$samlnonsso';
+            }
+            if ( document.client.uname ) { document.client.uname.focus(); }
+            if (document.getElementById('LC_SSO_login')) {
+                document.getElementById('LC_SSO_login').style.display = 'none';
+            }
+        } else {
+            document.getElementById('LC_standard_login').style.display = 'none';
+            if (document.getElementById('LC_login_text')) {
+                document.getElementById('LC_login_text').innerHTML = '$samlssotext';
+            }
+            if (document.getElementById('LC_SSO_login')) {
+                document.getElementById('LC_SSO_login').style.display = 'inline-block';
+            }
+        }
+    }
+    return;
+}
+
+// ]]>
+</script>
+
+ENDSAMLJS
+    }
+
+# --------------------------------------------------- Print login screen header
+
+    my %add_entries = (
+	       bgcolor      => "$mainbg",
+	       text         => "$font",
+	       link         => "$link",
+	       vlink        => "$vlink",
+	       alink        => "$alink",
+               onload       => 'javascript:enableInput();',);
+
+    my ($headextra,$headextra_exempt);
+    $headextra = $defaultdomconf{$defdom.'.login.headtag_'.$lonhost_in_use};
+    $headextra_exempt = $defaultdomconf{$domain.'.login.headtag_exempt_'.$lonhost_in_use};
+    if ($headextra) {
+        my $omitextra;
+        if ($headextra_exempt ne '') {
+            my @exempt = split(',',$headextra_exempt);
+            my $ip = &Apache::lonnet::get_requestor_ip();
+            if (grep(/^\Q$ip\E$/,@exempt)) {
+                $omitextra = 1;
+            }
+        }
+        unless ($omitextra) {
+            my $confname = $defdom.'-domainconfig';
+            if ($headextra =~ m{^\Q/res/$defdom/$confname/login/headtag/$lonhost_in_use/\E}) {
+                my $extra = &Apache::lonnet::getfile(&Apache::lonnet::filelocation("",$headextra));
+                unless ($extra eq '-1') {
+                    $js .= "\n".$extra."\n";
+                }
+            }
+        }
+    }
+
+    $r->print(&Apache::loncommon::start_page('The LearningOnline Network with CAPA Login',$js,
+			       { 'redirect'       => [$expire,'/adm/roles'], 
+				 'add_entries' => \%add_entries,
+				 'only_body'   => 1,}));
+
+# ----------------------------------------------------------------------- Texts
+
+    my %lt=&Apache::lonlocal::texthash(
+          'un'       => 'Username',
+          'pw'       => 'Password',
+          'dom'      => 'Domain',
+          'perc'     => 'percent',
+          'load'     => 'Server Load',
+          'userload' => 'User Load',
+          'catalog'  => 'Course/Community Catalog',
+          'log'      => 'Log in',
+          'help'     => 'Log-in Help',
+          'serv'     => 'Server',
+          'servadm'  => 'Server Administration',
+          'helpdesk' => 'Contact Helpdesk',
+          'forgotpw' => 'Forgot password?',
+          'newuser'  => 'New User?',
+          'change'   => 'Change?',
+       );
+# -------------------------------------------------- Change password field name
+
+    my $forgotpw = &forgotpwdisplay(%lt);
+    $forgotpw .= '<br />' if $forgotpw;
+    my $loginhelp = &Apache::lonauth::loginhelpdisplay($authdomain);
+    if ($loginhelp) {
+        $loginhelp = '<a href="'.$loginhelp.'">'.$lt{'help'}.'</a><br />';
+    }
+
+# ---------------------------------------------------- Serve out DES JavaScript
+    {
+    my $jsh=Apache::File->new($include."/londes.js");
+    $r->print(<$jsh>);
+    }
+# ---------------------------------------------------------- Serve rest of page
+
+    $r->print(
+    '<div class="LC_Box"'
+   .' style="margin:0 auto; padding:10px; width:90%; height: auto; background-color:#FFFFFF;">'
+);
+
+    my $target = '_top';
+    if ($sessiondata{'linkprot'}) {
+        my ($linkprotector,$deeplink) = split(/:/,$sessiondata{'linkprot'},2);
+        if (($deeplink eq $sessiondata{'origurl'}) &&
+            (($sessiondata{'linkprotuser'} eq $sessiondata{'username'}.':'.$sessiondata{'domain'}) ||
+             ($sessiondata{'linkprotuser'} eq $sessiondata{'username'}))) {
+            $target = '_self';
+        }
+    }
+    $r->print(<<ENDSERVERFORM);
+<form name="server" action="/adm/authenticate" method="post" target="$target">
+   <input type="hidden" name="logtoken" value="$logtoken" />
+   <input type="hidden" name="serverid" value="$lonhost" />
+   <input type="hidden" name="uname" value="" />
+   <input type="hidden" name="upass0" value="" />
+   <input type="hidden" name="udom" value="" />
+   <input type="hidden" name="localpath" value="$env{'form.localpath'}" />
+   <input type="hidden" name="localres" value="$env{'form.localres'}" />
+  </form>
+ENDSERVERFORM
+    my $coursecatalog;
+    if (($showcoursecat eq '') || ($showcoursecat)) {
+        $coursecatalog = &coursecatalog_link($lt{'catalog'}).'<br />';
+    }
+    my $newuserlink;
+    if ($shownewuserlink) {
+        $newuserlink = &newuser_link($lt{'newuser'}).'<br />';
+    }
+    my $logintitle =
+        '<h2 class="LC_hcell"'
+       .' style="background:'.$loginbox_header_bgcol.';'
+       .' color:'.$loginbox_header_textcol.'">'
+       .$lt{'log'}
+       .'</h2>';
+
+    my $noscript_warning='<noscript><span class="LC_warning"><b>'
+                        .&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.')
+                        .'</b></span></noscript>';
+    my $helpdeskscript;
+    my $contactblock = &contactdisplay(\%lt,$servadm,$showadminmail,
+                                       $authdomain,\$helpdeskscript,
+                                       $showhelpdesk,\@possdoms);
+
+    my $mobileargs;
+    if ($clientmobile) {
+        $mobileargs = 'autocapitalize="off" autocorrect="off"'; 
+    }
+    my $loginform=(<<LFORM);
+<form name="client" action="" onsubmit="return(send())" id="lclogin">
+  <input type="hidden" name="lextkey" value="$lextkey" />
+  <input type="hidden" name="uextkey" value="$uextkey" />
+  <b><label for="uname">$lt{'un'}</label>:</b><br />
+  <input type="text" name="uname" id="uname" size="15" value="$authusername" readonly="readonly" $mobileargs /><br />
+  <b><label for="upass$now">$lt{'pw'}</label>:</b><br />
+  <input type="password" name="upass$now" id="upass$now" size="15" readonly="readonly" /><br />
+  <b><label for="udom">$lt{'dom'}</label>:</b><br />
+  <input type="text" name="udom" id="udom" size="15" value="$authdomain" readonly="readonly" $mobileargs /><br />
+  <input type="submit" value="$lt{'log'}" />
+</form>
+LFORM
+
+    if ($showbanner) {
+        my $alttext = &Apache::loncommon::designparm('login.alttext_img',$domain);
+        if ($alttext eq '') {
+            $alttext = 'The Learning Online Network with CAPA';
+        }
+        $r->print(<<HEADER);
+<!-- The LON-CAPA Header -->
+<div style="background:$pgbg;margin:0;width:100%;">
+  <img src="$img" border="0" alt="$alttext" class="LC_maxwidth" id="lcloginbanner" />
+</div>
+HEADER
+    }
+
+    my $stdauthformstyle = 'inline-block';
+    my $ssoauthstyle = 'none';
+    my $sso_onclick;
+    my $logintype;
+    $r->print('<div style="float:left;margin-top:0;">');
+    if ($saml_landing) {
+        $ssoauthstyle = 'inline-block';
+        $stdauthformstyle = 'none';
+        $logintype = $samlssotext;
+        my $ssologin = '/adm/sso';
+        if ($samlssourl  ne '') {
+            $ssologin = $samlssourl;
+        }
+        my $ssologin_for_js = &js_escape($ssologin);
+        my $querystr_for_js;
+        if (($logtoken eq 'con_lost') || ($logtoken eq 'no_such_host')) {
+            my $querystring;
+            if ($env{'form.firsturl'} ne '') {
+                $querystring = 'origurl=';
+                if ($env{'form.firsturl'} =~ /[^\x00-\xFF]/) {
+                    $querystring .= &uri_escape_utf8($env{'form.firsturl'});
+                } else {
+                    $querystring .= &uri_escape($env{'form.firsturl'});
+                }
+                $querystring = &HTML::Entities::encode($querystring,"'");
+            }
+            if ($env{'form.ltoken'} ne '') {
+                $querystring .= (($querystring eq '')?'':'&amp;') . 'ltoken='.
+                                  &HTML::Entities::encode(&uri_escape($env{'form.ltoken'}));
+            } elsif ($env{'form.linkkey'}) {
+                $querystring .= (($querystring eq '')?'':'&amp;') . 'linkkey='.
+                                  &HTML::Entities::encode(&uri_escape($env{'form.linkkey'}));
+            }
+            if ($querystring ne '') {
+                $ssologin .= (($ssologin=~/\?/)?'&amp;':'?') . $querystring;
+                $querystr_for_js = &js_escape($querystring);
+            }
+        } elsif ($logtoken ne '') {
+            $ssologin .= (($ssologin=~/\?/)?'&amp;':'?') . 'logtoken='.$logtoken;
+            $querystr_for_js = &js_escape('logtoken='.$logtoken);
+        }
+        my $ssohref;
+        if ($samlwindow) {
+            $sso_onclick = <<"ENDJS";
+if (document.getElementById('LC_sso_login_link')) {
+    var ssoelem = document.getElementById('LC_sso_login_link')
+    ssoelem.addEventListener('click',samlWinFunction,false);
+    var windows = {};
+    function samlWinFunction(evt) {
+        evt.preventDefault();
+        var url = '$ssologin_for_js';
+        var name = 'lcssowin';
+        var querystr = '$querystr_for_js';
+        if (querystr) {
+            url += '?'+querystr+'&lcssowin=1';
+        } else {
+            url += '?lcssowin=1';
+        }
+        if ((typeof windows[name] !== 'undefined') && (!windows[name].closed)) {
+            windows[name].close();
+        }
+        windows[name]=window.open(url,name,'width=350,height=600');
+        windows[name].focus();
+        return false;
+    }
+}
+ENDJS
+        }
+        if ($samlssoimg ne '') {
+            $ssohref = '<a href="'.$ssologin.'" title="'.$samltooltip.'" id="LC_sso_login_link">'.
+                       '<img src="'.$samlssoimg.'" alt="'.$samlssoalt.'" id="lcssobutton" /></a>';
+        } else {
+            $ssohref = '<a href="'.$ssologin.'" id="LC_sso_login_link">'.$samlssotext.'</a>';
+        }
+        if (($env{'form.saml'} eq 'no') ||
+            (($env{'form.username'} ne '') && ($env{'form.domain'} ne ''))) {
+            $ssoauthstyle = 'none';
+            $stdauthformstyle = 'inline-block';
+            $logintype = $samlnonsso;
+        }
+        $r->print(<<ENDSAML);
+<p>
+Log-in type:
+<span style="font-weight:bold" id="LC_login_text">$logintype</span><br />
+<span><a href="javascript:toggleLClogin();" style="color:#000000">$lt{'change'}</a></span>
+</p>
+<div style="display:$ssoauthstyle" id="LC_SSO_login">
+<div class="LC_Box" style="padding-top: 10px;">
+$ssohref
+$noscript_warning
+</div>
+<div class="LC_Box" style="padding-top: 10px;">
+$loginhelp
+$contactblock
+$coursecatalog
+</div>
+</div>
+ENDSAML
+    } else {
+        if ($env{'form.ltoken'}) {
+            &Apache::lonnet::tmpdel($env{'form.ltoken'});
+            delete($env{'form.ltoken'});
+        }
+    }
+    my $in_frame_js;
+    if ($linkprot_for_login) {
+        my ($linkprotector,$linkproturi) = split(/:/,$linkprot_for_login,2);
+        if (($linkprotector =~ /^\d+(c|d)$/) && ($linkproturi =~ m{^/+tiny/+$LONCAPA::match_domain/+\w+$})) {
+            my $set_target;
+            if (($env{'form.retry'}) || ($env{'form.sso'})) {
+                if ($linkproturi eq $env{'form.firsturl'}) {
+                    $set_target = "    document.server.target = '_self';";
+                }
+            } else {
+                $set_target = <<ENDTARG;
+    var linkproturi = '$linkproturi';
+    var path = document.location.pathname.replace( new RegExp('^/adm/launch'),'');
+    if (linkproturi == path) {
+        document.server.target = '_self';
+    }
+ENDTARG
+            }
+            $in_frame_js = <<ENDJS;
+<script type="text/javascript">
+// <![CDATA[
+if ((window.self !== window.top) && (document.server.target != '_self')) {
+    $set_target
+    $sso_onclick
+}
+// ]]>
+</script>
+ENDJS
+        }
+    } elsif ($samlwindow) {
+        $in_frame_js = <<ENDJS;
+<script type="text/javascript">
+// <![CDATA[
+if ((window.self !== window.top) && (document.server.target != '_self')) {
+    $sso_onclick
+}
+// ]]>
+</script>
+ENDJS
+    }
+
+    $r->print(<<ENDLOGIN);
+<div style="display:$stdauthformstyle;" id="LC_standard_login">
+<div class="LC_Box" style="background:$loginbox_bg;">
+  $logintitle
+  $loginform
+  $noscript_warning
+</div>
+  
+<div class="LC_Box" style="padding-top: 10px;">
+  $loginhelp
+  $forgotpw
+  $contactblock
+  $newuserlink
+  $coursecatalog
+</div>
+</div>
+
+ENDLOGIN
+    $r->print('</div><div>'."\n");
+    if ($showmainlogo) {
+        my $alttext = &Apache::loncommon::designparm('login.alttext_logo',$domain); 
+        $r->print(' <img src="'.$logo.'" alt="'.$alttext.'" class="LC_maxwidth" id="lcloginmainlogo" />'."\n");
+    }
+$r->print(<<ENDTOP);
+$announcements
+</div>
+<hr style="clear:both;" />
+ENDTOP
+    my ($domainrow,$serverrow,$loadrow,$userloadrow,$versionrow);
+    $domainrow = <<"END";
+      <tr>
+       <td  align="left" valign="top">
+        <small><b>$lt{'dom'}:&nbsp;</b></small>
+       </td>
+       <td  align="left" valign="top">
+        <small><tt>&nbsp;$domain</tt></small>
+       </td>
+      </tr>
+END
+    $serverrow = <<"END";
+      <tr>
+       <td  align="left" valign="top">
+        <small><b>$lt{'serv'}:&nbsp;</b></small>
+       </td>
+       <td align="left" valign="top">
+        <small><tt>&nbsp;$lonhost ($role)</tt></small>
+       </td>
+      </tr>
+END
+    if ($loadlim) {
+        $loadrow = <<"END";
+      <tr>
+       <td align="left" valign="top">
+        <small><b>$lt{'load'}:&nbsp;</b></small>
+       </td>
+       <td align="left" valign="top">
+        <small><tt>&nbsp;$loadpercent $lt{'perc'}</tt></small>
+       </td>
+      </tr>
+END
+    }
+    if ($uloadlim) {
+        $userloadrow = <<"END";
+      <tr>
+       <td align="left" valign="top">
+        <small><b>$lt{'userload'}:&nbsp;</b></small>
+       </td>
+       <td align="left" valign="top">
+        <small><tt>&nbsp;$userloadpercent $lt{'perc'}</tt></small>
+       </td>
+      </tr>
+END
+    }
+    if (($version ne '') && ($version ne '<!-- VERSION -->')) {
+        $versionrow = <<"END";
+      <tr>
+       <td colspan="2" align="left">
+        <small>$version</small>
+       </td>
+      </tr>
+END
+    }
+
+    $r->print(<<ENDDOCUMENT);
+    <div style="float: left;">
+     <table border="0" cellspacing="0" cellpadding="0">
+$domainrow
+$serverrow
+$loadrow    
+$userloadrow
+$versionrow
+     </table>
+    </div>
+    <div style="float: right;">
+    $domainlogo
+    </div>
+    <br style="clear:both;" />
+ </div>
+
+$in_frame_js
+<script type="text/javascript">
+// <![CDATA[
+// the if prevents the script error if the browser can not handle this
+if ( document.client.uname ) { document.client.uname.focus(); }
+// ]]>
+</script>
+$helpdeskscript
+
+ENDDOCUMENT
+    my %endargs = ( 'noredirectlink' => 1, );
+    $r->print(&Apache::loncommon::end_page(\%endargs));
+    return OK;
+}
+
+sub check_loginvia {
+    my ($domain,$lonhost,$lonidsdir,$balcookie) = @_;
+    if ($domain eq '' || $lonhost eq '' || $lonidsdir eq '') {
+        return;
+    }
+    my %domconfhash = &Apache::loncommon::get_domainconf($domain);
+    my $loginvia = $domconfhash{$domain.'.login.loginvia_'.$lonhost};
+    my $loginvia_exempt = $domconfhash{$domain.'.login.loginvia_exempt_'.$lonhost};
+    my $output;
+    if ($loginvia ne '') {
+        my $noredirect;
+        my $ip = &Apache::lonnet::get_requestor_ip();   
+        if ($ip eq '127.0.0.1') {
+            $noredirect = 1;
+        } else {
+            if ($loginvia_exempt ne '') {
+                my @exempt = split(',',$loginvia_exempt);
+                if (grep(/^\Q$ip\E$/,@exempt)) {
+                    $noredirect = 1;
+                }
+            }
+        }
+        unless ($noredirect) {
+            my ($newhost,$path);
+            if ($loginvia =~ /:/) {
+                ($newhost,$path) = split(':',$loginvia);
+            } else {
+                $newhost = $loginvia;
+            }
+            if ($newhost ne $lonhost) {
+                if (&Apache::lonnet::hostname($newhost) ne '') {
+                    if ($balcookie) {
+                        my ($balancer,$cookie) = split(/:/,$balcookie);
+                        if ($cookie =~ /^($match_domain)_($match_username)_([a-f0-9]+)$/) {
+                            my ($udom,$uname,$cookieid) = ($1,$2,$3);
+                            unless (&Apache::lonnet::delbalcookie($cookie,$balancer) eq 'ok') {
+                                if ((-d $lonidsdir) && (opendir(my $dh,$lonidsdir))) {
+                                    while (my $filename=readdir($dh)) {
+                                        if ($filename=~/^(\Q$uname\E_\d+_\Q$udom\E_$match_lonid)\.id$/) {
+                                            my $handle = $1;
+                                            my %hash =
+                                                &Apache::lonnet::get_sessionfile_vars($handle,$lonidsdir,
+                                                                                     ['request.balancercookie',
+                                                                                      'user.linkedenv']);
+                                            if ($hash{'request.balancercookie'} eq "$balancer:$cookieid") {
+                                                if (unlink("$lonidsdir/$filename")) {
+                                                    if (($hash{'user.linkedenv'} =~ /^[a-f0-9]+_linked$/) &&
+                                                        (-l "$lonidsdir/$hash{'user.linkedenv'}.id") &&
+                                                        (readlink("$lonidsdir/$hash{'user.linkedenv'}.id") eq "$lonidsdir/$filename")) {
+                                                        unlink("$lonidsdir/$hash{'user.linkedenv'}.id");
+                                                    }
+                                                }
+                                            }
+                                            last;
+                                        }
+                                    }
+                                    closedir($dh);
+                                }
+                            }
+                        }
+                    }
+                    $output = &redirect_page($newhost,$path);
+                }
+            }
+        }
+    }
+    return $output;
+}
+
+sub redirect_page {
+    my ($desthost,$path) = @_;
+    my $hostname = &Apache::lonnet::hostname($desthost);
+    my $protocol = $Apache::lonnet::protocol{$desthost};
+    $protocol = 'http' if ($protocol ne 'https');
+    unless ($path =~ m{^/}) {
+        $path = '/'.$path;
+    }
+    my $url = $protocol.'://'.$hostname.$path;
+    my $args = {};
+    if ($env{'form.firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+        $url = $protocol.'://'.$hostname.$env{'form.firsturl'};
+        if (($env{'form.ltoken'}) || ($env{'form.linkprot'} ne '') ||
+            ($env{'form.linkkey'} ne '')) {
+            my %link_info;
+            if ($env{'form.ltoken'}) {
+                %link_info = &Apache::lonnet::tmpget($env{'form.ltoken'});
+                &Apache::lonnet::tmpdel($env{'form.ltoken'});
+                $args->{'only_body'} = 1;
+            } elsif ($env{'form.linkprot'}) {
+                $link_info{'linkprot'} = $env{'form.linkprot'};
+                foreach my $item ('linkprotuser','linkprotexit','linkprotpbid','linkprotpburl') {
+                    if ($env{'form.'.$item}) {
+                        $link_info{$item} = $env{'form.'.$item};
+                    }
+                }
+                $args->{'only_body'} = 1;
+            } elsif ($env{'form.linkkey'} ne '') {
+                $link_info{'linkkey'} = $env{'form.linkkey'};
+            }
+            my $token = &Apache::lonnet::tmpput(\%link_info,$desthost,'link');
+            unless (($token eq 'con_lost') || ($token eq 'refused') ||
+                    ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
+                $url .= '?ltoken='.$token;
+            }
+        }
+    } else {
+        my $querystring;
+        if ($env{'form.firsturl'} ne '') {
+            if ($env{'form.firsturl'} =~ /[^\x00-\xFF]/) {
+                $querystring = &uri_escape_utf8($env{'form.firsturl'});
+            } else {
+                $querystring = &uri_escape($env{'form.firsturl'});
+            }
+            $querystring = &HTML::Entities::encode($querystring,"'");
+            $querystring = '?firsturl='.$querystring;
+        }
+        if ($env{'form.ltoken'}) {
+            my %link_info = &Apache::lonnet::tmpget($env{'form.ltoken'});
+            &Apache::lonnet::tmpdel($env{'form.ltoken'});
+            my $token = &Apache::lonnet::tmpput(\%link_info,$desthost,'link');
+            unless (($token eq 'con_lost') || ($token eq 'refused') || ($token =~ /^error:/) ||
+                    ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
+                unless (($path eq '/adm/roles') || ($path eq '/adm/login')) {
+                    $url = $protocol.'://'.$hostname.'/adm/roles';
+                }
+                $querystring .= (($querystring =~/^\?/)?'&amp;':'?') . 'ttoken='.$token;
+            }
+        }
+        $url .= $querystring;
+    }
+    $args->{'redirect'} = [0,$url,'','',1];
+    my $start_page = &Apache::loncommon::start_page('Switching Server ...',undef,$args);
+    my $end_page   = &Apache::loncommon::end_page();
+    return $start_page.$end_page;
+}
+
+sub contactdisplay {
+    my ($lt,$servadm,$showadminmail,$authdomain,$helpdeskscript,$showhelpdesk,
+        $possdoms) = @_;
+    my $contactblock;
+    my $origmail;
+    if (ref($possdoms) eq 'ARRAY') {
+        if (grep(/^\Q$authdomain\E$/,@{$possdoms})) { 
+            $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
+        }
+    }
+    my $requestmail = 
+        &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
+                                                 $authdomain,$origmail);
+    unless ($showhelpdesk eq '0') {
+        if ($requestmail =~ m/[^\@]+\@[^\@]+/) {
+            $showhelpdesk = 1;
+        } else {
+            $showhelpdesk = 0;
+        }
+    }
+    if ($servadm && $showadminmail) {
+        $contactblock .= $$lt{'servadm'}.':<br />'.
+                         '<tt>'.$servadm.'</tt><br />';
+    }
+    if ($showhelpdesk) {
+        $contactblock .= '<a href="javascript:helpdesk()">'.$lt->{'helpdesk'}.'</a><br />';
+        my $thisurl = &escape('/adm/login');
+        $$helpdeskscript = <<"ENDSCRIPT";
+<script type="text/javascript">
+// <![CDATA[
+function helpdesk() {
+    var possdom = document.client.udom.value;
+    var codedom = possdom.replace( new RegExp("[^A-Za-z0-9.\\-]","g"),'');
+    if (codedom == '') {
+        codedom = "$authdomain";
+    }
+    var querystr = "origurl=$thisurl&codedom="+codedom;
+    document.location.href = "/adm/helpdesk?"+querystr;
+    return;
+}
+// ]]>
+</script>
+ENDSCRIPT
+    }
+    return $contactblock;
+}
+
+sub forgotpwdisplay {
+    my (%lt) = @_;
+    my $prompt_for_resetpw = 1; 
+    if ($prompt_for_resetpw) {
+        return '<a href="/adm/resetpw">'.$lt{'forgotpw'}.'</a>';
+    }
+    return;
+}
+
+sub coursecatalog_link {
+    my ($linkname) = @_;
+    return <<"END";
+      <a href="/adm/coursecatalog">$linkname</a>
+END
+}
+
+sub newuser_link {
+    my ($linkname) = @_;
+    return '<a href="/adm/createaccount">'.$linkname.'</a>';
+}
+
+sub decode_token {
+    my ($info) = @_;
+    my ($firsturl,@rest)=split(/\&/,$info);
+    my %form;
+    if ($firsturl ne '') {
+        $form{'firsturl'} = &unescape($firsturl);
+    }
+    foreach my $item (@rest) {
+        my ($key,$value) = split(/=/,$item);
+        $form{$key} = &unescape($value);
+    }
+    return %form;
+}
+
+1;
+__END__