# The LearningOnline Network
# Login Screen
#
# $Id: lonlogin.pm,v 1.93 2007/04/17 15:44:58 www 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 CGI::Cookie();
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 %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
    my $lonid=$cookies{'lonID'};
    my $cookie;
    if ($lonid) {
	my $handle=&LONCAPA::clean_handle($lonid->value);
        my $lonidsdir=$r->dir_config('lonIDsDir');
	if (-e "$lonidsdir/$handle.id") {
# Is there an existing token file?
	    if ($handle=~/^publicuser\_/) {
# For "public user" - remove it, we apparently really want to login
		unlink("$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(<<ENDFAILED);
$start_page
<h1>You are already logged in</h1>
<p>Please either <a href="/adm/roles">continue the current session</a> or
<a href="/adm/logout">logout</a>.</p>
<p>
<a href="/adm/loginproblems.html">Problems?</a></p>
$end_page
ENDFAILED
                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 $port_to_use=$r->dir_config('lonhttpdPort');
    if (!defined($port_to_use)) {
	$port_to_use='8080';
    }
    my $iconpath= 'http://'.$ENV{'HTTP_HOST'}.':'.$port_to_use.
                  $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 access server and overloaded?
    if (($role eq 'access') &&
	(($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;

# --------------------------------------------------- Print login screen header
    $r->print(<<ENDHEADER);
<html>
<head>
<meta HTTP-EQUIV="Refresh" CONTENT="$expire; url=/adm/roles" />
<title>The LearningOnline Network with CAPA Login</title>
</head>
ENDHEADER
# ---------------------------------------------------- Serve out DES JavaScript
    {
	my $jsh=Apache::File->new($include."/londes.js");
        $r->print(<$jsh>);
    }

# ----------------------------------------------------------- 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 $logo=&Apache::loncommon::designparm('login.logo',$domain);
    my $img=&Apache::loncommon::designparm('login.img',$domain);
    my $domainlogo=&Apache::loncommon::domainlogo($domain);
    my $showadminmail=&Apache::loncommon::designparm('login.adminmail',                                                      $domain);
    my $showcoursecat =
        &Apache::loncommon::designparm('login.coursecatalog',$domain);


# ----------------------------------------------------------------------- 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',
		  'auth' => 'userauthentication.gif',
		  'log' => 'Log in',
		  'help' => 'Log-in Help',
		  'serv' => 'Server',
                  'servadm' => 'Server Administration',
                  'helpdesk' => 'Contact Helpdesk',
                  'forgotpw' => 'Forgot password?');
# -------------------------------------------------- Change password field name
    my $now=time;
    my $forgotpw = &forgotpwdisplay(%lt);
    my $loginhelp = &loginhelpdisplay(%lt);
# ---------------------------------------------------------- Serve rest of page
    $r->print(<<ENDSCRIPT);

<body bgcolor="$pgbg" text="$font" link="$link" vlink="$vlink" alink="$alink"
  topmargin=0 leftmargin=0 marginwidth=0 marginheight=0>

 <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

    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 {
    $r->print('<h1>The Learning<i>Online</i> Network with CAPA</h1><h2>Text-based Interface Login</h2>'.$announcements);
}
    $r->print('<form name="client" onsubmit="return(send())">');
    unless ($fullgraph) {
        $r->print(<<ENDACCESSOPTIONS);
<h3>Select Accessibility Options</h3>
<label><input type="checkbox" name="imagesuppress" /> Suppress rendering of images</label><br />
<label><input type="checkbox" name="appletsuppress" /> Suppress Java applets</label><br />
<label><input type="checkbox" name="embedsuppress" /> Suppress rendering of embedded multimedia</label><br />
<label><input type="checkbox" name="fontenhance" /> Increase font size</label><br />
<label><input type="checkbox" name="blackwhite" /> Switch to black and white mode</label><br />
<input type="checkbox" name="remember" /> Remember these settings for next login<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
}
    $r->print(<<ENDLOGIN);
     <input type="hidden" name="lextkey" value="$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><td bgcolor="$sidebg" colspan=2><img src="$iconpath/$lt{'auth'}" alt="User Authentication" /></td></tr>
      <tr>
       <td bgcolor="$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
}
    $r->print('</body></html>');
    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__