# The LearningOnline Network
# Login Screen
#
# $Id: lonlogin.pm,v 1.16 2023/03/22 16:32:51 gci 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;
use HTML::Entities();
 
sub handler {
    my $r = shift;

    &Apache::loncommon::get_unprocessed_cgi
	(join('&',$ENV{'QUERY_STRING'},$env{'request.querystring'},
	      $ENV{'REDIRECT_QUERY_STRING'}),
	 ['interface','username','domain','firsturl','localpath','localres',
	  'token','role','symb']);
    if (!defined($env{'form.firsturl'})) {
        &Apache::lonacc::get_posted_cgi($r,['firsturl']);
    }

# -- check if they are a migrating user
    if (defined($env{'form.token'})) {
	return &Apache::migrateuser::handler($r);
    }

    &Apache::loncommon::no_cache($r);
    &Apache::lonlocal::get_language_handle($r);
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;
    return OK if $r->header_only;

# Are we re-routing?
    if (-e '/home/httpd/html/lon-status/reroute.txt') {
	&Apache::lonauth::reroute($r);
	return OK;
    }


# -------------------------------- Prevent users from attempting to login twice
    my $handle = &Apache::lonnet::check_for_valid_session($r);
    if ($handle=~/^publicuser\_/) {
# For "public user" - remove it, we apparently really want to login
	unlink($r->dir_config('lonIDsDir')."/$handle.id");
    } elsif ($handle ne '') {
# Indeed, a valid token is found
	my $start_page = 
	    &Apache::loncommon::start_page('Already logged in');
	my $end_page = 
	    &Apache::loncommon::end_page();
        my $dest = '/adm/roles';
        if ($env{'form.role'}) {
            $dest .= '?selectrole=1&'.$env{'form.role'}.'=1';
        }
        if ($env{'form.symb'}) {
            $dest .= ($dest =~ /\?/) ? '&' : '?'; 
            $dest .= 'destinationurl='.&HTML::Entities::encode($env{'form.symb'},'"&<>');
        }
        if ($env{'form.firsturl'} ne '') {
            $dest = $env{'form.firsturl'};
        }
	$r->print(
                  $start_page
                 .'<h1>'.&mt('You are already logged in!').'</h1>'
                 .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].',
                  '<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>').'</p>'
                 .'<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 %longname = (
                     GCI  => 'Geoscience Concept Inventory',
                     SLCI => 'Science Literacy Concept Inventory',
                   );
    my %allnums = &Apache::loncommon::get_faculty_cnums();
    my ($inventory,$uc_inventory,$testdom);
    if ($domain =~ /^(\w+ci)test$/) {
        $inventory = $1;
        $testdom = $domain;
    } else {
        $inventory = $domain;
        $testdom = $domain.'test';
    }
    $uc_inventory = uc($inventory);
    my $sitename; = $uc_inventory.' WebCenter';
    my $shortsitename = 'WebCenter';
    my $existing = 'Existing WebCenter user?';
    my $sitedesc = &mt('The [_1]WebCenter[_2] is a place to comment on existing concept questions, or submit new ones, and is also a place to build and manage Concept Tests which your students will complete via the [_3]Testing Center[_2].',$longname{$inventory}.' ('.$uc_inventory.') <a href="http://'.$inventory.'.lite.msu.edu/">','</a>','<a href="http://'.$testdom.'.lite.msu.edu/adm/login">');
    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);
    if ($domain =~ /^(\w+ci)test$/) {
        $lonhost = $domain.'l1';
        $host_name = $domain.'.lite.msu.edu';
        $sitename = $inventory.' Testing Center';
        $shortsitename = 'Testing Center';
        $existing = 'Student with Testing Center account?';
        $sitedesc = &mt('The [_1] Testing Center is used by [_2]students[_3] to complete online concept tests created by their instructors using questions available in the [_4].',$inventory,'<i>','</i>',$longname{$inventory});
    }

# --------------------------------------------- Default values for login fields

    my $authusername=($env{'form.username'}?$env{'form.username'}:'');
    my $authdomain=($env{'form.domain'}?$env{'form.domain'}:$domain);

# ---------------------------------------------------------- Determine own load
    my $loadavg;
    {
	my $loadfile=Apache::File->new('/proc/loadavg');
	$loadavg=<$loadfile>;
    }
    $loadavg =~ s/\s.*//g;
    my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
    my $userloadpercent=&Apache::lonnet::userload();

# ------------------------------------------------------- Do the load balancing
    my $otherserver= &Apache::lonnet::absolute_url($host_name);
    my $firsturl=
    ($env{'request.firsturl'}?$env{'request.firsturl'}:$env{'form.firsturl'});
# ---------------------------------------------------------- Are we overloaded?
    if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
        my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent);
	if ($unloaded) { $otherserver=$unloaded; }
    }

# ----------------------------------------------------------- Get announcements
    my $announcements=&Apache::lonnet::getannounce();
# -------------------------------------------------------- Set login parameters

    my @hexstr=('0','1','2','3','4','5','6','7',
                '8','9','a','b','c','d','e','f');
    my $lkey='';
    for (0..7) {
        $lkey.=$hexstr[rand(15)];
    }

    my $ukey='';
    for (0..7) {
        $ukey.=$hexstr[rand(15)];
    }

    my $lextkey=hex($lkey);
    if ($lextkey>2147483647) { $lextkey-=4294967296; }

    my $uextkey=hex($ukey);
    if ($uextkey>2147483647) { $uextkey-=4294967296; }

# -------------------------------------------------------- Store away log token
    my $tokenextras;
    if ($env{'form.role'}) {
        $tokenextras = '&role='.&escape($env{'form.role'});
    }
    if ($domain !~ /^\w+citest$/) {
        unless ($env{'form.symb'} eq '/adm/statistics') {
            $env{'form.symb'} = '/adm/ci_info';
        }
    }
    if ($env{'form.symb'}) {
        if (!$tokenextras) {
            $tokenextras = '&';
        }
        $tokenextras .= '&symb='.&escape($env{'form.symb'});
    }
    my $logtoken=Apache::lonnet::reply(
       'tmpput:'.$ukey.$lkey.'&'.$firsturl.$tokenextras,
       $lonhost);

# ------------------- If we cannot talk to ourselves, we are in serious trouble

    if ($logtoken eq 'con_lost') {
        my $spares='';
	my $last;
        foreach my $hostid (sort
			    {
				&Apache::lonnet::hostname($a) cmp
				    &Apache::lonnet::hostname($b);
			    }
			    keys(%Apache::lonnet::spareid)) {
            next if ($hostid eq $lonhost);
	    my $hostname = &Apache::lonnet::hostname($hostid);
	    next if ($last eq $hostname);
            $spares.='<br /><font size="+1"><a href="http://'.
                $hostname.
                '/adm/login?domain='.$authdomain.'">'.
                $hostname.'</a>'.
                ' '.&mt('(preferred)').'</font>'.$/;
	    $last=$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(
           '<html>'
          .'<head><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" align="right" />'
          .'<h3>'.&mt("The $sitename server is temporarily not available for login.").'</h3>'
          .'</body>'
          .'</html>'
        );
        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 $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 $showadminmail=&Apache::loncommon::designparm('login.adminmail',$domain);
    my $showcoursecat =
        &Apache::loncommon::designparm('login.coursecatalog',$domain);
    my $loginheader =&Apache::loncommon::designparm('login.loginheader',$domain);
    my $shownewuserlink = 
        &Apache::loncommon::designparm('login.newuser',$domain);
    my $now=time;
    my $js = (<<ENDSCRIPT);

 <script type="text/javascript" language="JavaScript">
 // <![CDATA[

    function send(caller)
    {

        if (caller == "newaccount") {
            this.document.signup.submit();
            return false;
        }
        if (document.client.uname.value == "" || !document.client.uname.value) {
            alert("You must provide a username ");
            return false;
        }
        if (document.client.upass$now.value == "" || !document.client.upass$now.value) {
            alert("You must provide a password");
            return false;
        }

        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",
                       onload       => "if ( document.client.uname ) { document.client.uname.focus(); }",
                       marginheight => "0",);

    my $css_url = "/css/$domain/login.css";
    $js .= "\n".'<link type="text/css" rel="stylesheet" href="'.$css_url.'">'."\n";
    $r->print(&Apache::loncommon::start_page($uc_inventory.' WebCenter 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',
		  'load' => 'Server 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?',
                  'newuser'  => 'New User?',
                  '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',
                  'tbli'     => 'Text-based Interface 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

    my $coursecatalog;
    if (($showcoursecat eq '') || ($showcoursecat)) {
        $coursecatalog = &coursecatalog_link($lt{'catalog'},$fullgraph);
    }
    my $newuserlink;
    if ($shownewuserlink) {
        $newuserlink = &newuser_link($lt{'newuser'});
    }
    if ($fullgraph) {
        $r->print(<<"END_OF_BLOCK1");
<br />
<div align="center">
<table class="LC_loginbox">
  <tr>
    <td align="left" valign="top" width="11">
     <img name="login_r1_c1" src="/images/login/$domain/r1_c1.png" width="11" height="11" border="0" alt="">
    </td>
    <td width="450" valign="top">
      <table class="LC_loginbox_left">
        <tr>
          <td width="411" align="left"><br /><img src="/images/login/$domain/logo_smrnd.png" width="411" height="51" alt="$uc_inventory" align="left"></td>
        </tr>
        <tr>
         <td>
          <div align="left" style="display:block; margin-top:5px; margin-bottom:5px; margin-left:0px; margin-right:0px; width:440px; height:5px;">
           <div class="divider">
            </div>
          </div>
        </td>
       </tr>
      </table>
      <table class="LC_loginbox_left">
       <tr>
        <td height="10" colspan="4">&nbsp;</td>
       </tr>
       <tr>
        <td width="10">&nbsp;</td>
        <td valign="top" class="bodyblue" width="430" align="left">
         <span style="font-size: 18px; line-height: 22px; "><font style="font-size: 18px; line-height: 22px;"><br />New to the $sitename?</font></span><br />
          <font class="bodyblue">$sitedesc<br /><br />The $shortsitename runs on <a href="http://loncapa.org/">LON-CAPA</a> - an open source freeware distributed learning content management and assessment system.</font><br /><br />
END_OF_BLOCK1
    if ($domain !~ /^\w+citest$/) {
        my $review;
        if (ref($allnums{$domain}) eq 'HASH') {
            $review = $domain.'_'.$allnums{$domain}{'review'};
        }
        $r->print(<<"END_OF_BLOCK2"); 
          <font class="bodyblue"><b>Create a $uc_inventory WebCenter ID</b> &#150; use your ID to submit comments or new content, or to create a new test.  If you are already a $uc_inventory WebCenter user, please log-in.</font><br /><br /><br />
         <form name="signup" method="post" action="/adm/createaccount?courseid=$review"><input type="hidden" name="process" value="signup"/>
         <table class="LC_signup">
           <tr>
             <td align="left" valign="top" width="11" height="11"><img src="/images/login/$domain/r2_c4.png" width="11" height="11" border="0" alt=""></td>
             <td>&nbsp;</td>
             <td align="right" valign="top" width="11" height="11"><img src="/images/login/$domain/r2_c6.png" width="11" height="11" border="0" alt=""></td>
           </tr>
           <tr>
             <td>&nbsp;</td>
             <td align="center" valign="middle"><span style="white-space: nowrap;">New to $uc_inventory WebCenter:&nbsp;<a href="javascript:send('newaccount')" style="color: #ffffff">Click here to sign up</a></span></td>
             <td>&nbsp;</td>
           </tr>
           <tr>
             <td align="left" valign="bottom" width="11" height="11"><img src="/images/login/$domain/r8_c4.png" width="11" height="11" border="0" alt=""></td>
             <td>&nbsp;</td>
             <td align="right" valign="bottom" width="11" height="11"><img src="/images/login/$domain/r8_c6.png" width="11" height="11" border="0" alt=""></td>
           </tr>
         </table>
         </form>
END_OF_BLOCK2
    } else {
        $r->print('<font class="bodyblue">'.
                  &mt("If you are already a $sitename user, please log-in.").' '.&mt('If not, contact your instructor to request a username and password.').
                 '</font><br /><br /><br />');
    }
    $r->print(<<"END_OF_BLOCK3");
        </td>
       </tr>
      </table>
     </td>
     <td width="10">&nbsp;</td>
     <td valign="top">
      <form name="client" method="post" onsubmit="return(send());">
      <table class="LC_loginbox_right">
       <tr>
        <td colspan="3" height="23" class="LC_loginbox_strip">&nbsp;</td>
       </tr>
       <tr>
        <td align="left" valign="top" width="11" height="11"><img src="/images/login/$domain/r2_c4.png" width="11" height="11" border="0" alt=""></td>
        <td>&nbsp;</td>
        <td align="right" valign="top" width="11" height="11"><img src="/images/login/$domain/r2_c6.png" width="11" height="11" border="0" alt=""></td>
       </tr>
       <tr>
        <td width="10">&nbsp;</td>
        <td>
         <table border="0" cellspacing="0" cellpadding="0">
          <tr>
           <td align="right" class="bodywhite" height=50><br>
            <span style="font-size: 15px; line-height: 17px; font-weight: bold;">
             $existing</span>
             <br />Please log-in.<br>
             <hr class="login"><br /><br />
            </td>
           </tr>
           <tr>
            <td>
             <table border="0" cellpadding="2" cellspacing="0">
              <tr>
               <td align="right" class="bodywhite"><label for="uname">$lt{'un'}</label>:</td>
               <td align="right"><input type="text" name="uname" size="17" value="$authusername" /></td>
               </tr>
               <tr>
                <td align="right" class="bodywhite"><label for="upass$now">$lt{'pw'}</label>:</td>
                <td align="right"><input name="upass$now" size="17" value="" type="password"><input type="hidden" name="udom" value="$domain" /></td>
               </tr>
               <tr><td>&nbsp;</td></tr>
               <tr>
                <td colspan="2" align="right"><input name="signin" type="submit" value="Log-in" class=buttonwhite /></td>
               </tr>
              </table>
             </td>
            </tr>
            <tr>
             <td align="right" valign="top" class="bodywhite">
              <br />
              <br /><br />
              <hr class="login" />
              <br />
              <a href="/adm/resetpw" style="color: #ffffff">Forgot your password?</a><br>
              <br />
             </td>
            </tr>
           </table>
          </td>
          <td width="9">&nbsp;</td>
        </tr>
        <tr>
          <td align="left" valign="bottom" width="11" height="11"><img src="/images/login/$domain/r8_c4.png" width="11" height="11" border="0" alt=""></td>
          <td>&nbsp;</td>
          <td align="right" valign="bottom" width="11" height="11"><img src="/images/login/$domain/r8_c6.png" width="11" height="11" border="0" alt=""></td>
        </tr>
        <tr>
          <td colspan="3" height="10" class="LC_loginbox_strip">&nbsp;</td>
        </tr>
      </table>
    </td>
    <td align="right" valign="top" width="11"><img src="/images/login/$domain/r1_c7.png" width="11" height="11" border="0" alt=""></td>
  </tr>
  <tr>
    <td colspan="4">
      <div align="left">
      <table border="0" cellspacing="0" cellpadding="0">
        <tr>
          <td width="10">&nbsp;</td>
       <td><font size="-1">
     <b>Note</b>:<br />
      If log-in fails, it may be because your browser is not accepting session cookies, or javascript is disabled. <a href="http://loncapa.msu.edu/student/cookies.html">Learn more</a>.
     </font>
         </td>
         <td width="10">&nbsp;</td>
       </tr>
     </table>
     </div>
   </td>
  </tr>
  <tr>
    <td align="left" valign="bottom" width="11"><img src="/images/login/$domain/r9_c1.png" width="11" height="11" border="0" alt=""></td>
    <td colspan="3" width="698">&nbsp;</td>
    <td align="right" valign="bottom" width="11"><img src="/images/login/$domain/r9_c7.png" width="11" height="11" border="0" alt=""></td>
  </tr>
</table>
</div>
<p>&nbsp;</p>
<noscript><font size='3'>&nbsp;&nbsp;<b>Please Note:</b>
 Javascript must be enabled in your web browser in order to use this web site.
 </font></noscript>
<p>&nbsp;</p>
<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="" />
END_OF_BLOCK3
    } else {
        $r->print(<<ENDACCESSOPTIONS);
<h1>The Learning<i>Online</i> Network with CAPA</h1>
<h2>$lt{'tbli'}</h2>$announcements
<h3>$lt{'options_headline'}</h3>
<form name="client" action="" onsubmit="return(send())">
<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'}
ENDACCESSOPTIONS
    }
    $r->print('
     <input type="hidden" name="lextkey" value="'.$lextkey.'" />
     <input type="hidden" name="uextkey" value="'.$uextkey.'" />
');
    unless ($fullgraph) {
        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>';
        }
        my $noscript_warning='<td colspan="2" bgcolor="'.$mainbg.'">'
                             .'<noscript><div class="LC_warning"><font size="-1">'
                             .&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.')
                            .'</font></div></noscript></td>';
        $r->print(<<ENDTEXTUAL);
     <hr />
     <table border="0" cellspacing="0" cellpadding="0">
      <tr>$logintitle</tr>
      <tr>$noscript_warning</tr>
      <tr>
       <td bgcolor="$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="$mainbg">&nbsp;</td>
       <td bgcolor="$mainbg" valign="bottom" align="center">
        <br />
        <input type="submit" value="$lt{'log'}" />
        <input type="hidden" name="udom" value="$domain" />
       </td>
      </tr>
      <tr>
       <td bgcolor="$mainbg" valign="bottom" align="left" colspan="2">
        $loginhelp
        $forgotpw
        $newuserlink
        $coursecatalog
        <br />
       </td>
      </tr>
     </table>
ENDTEXTUAL
    }
    $r->print(<<"ENDLOGIN");
  </form>
  <form name="server" action="$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="$env{'form.localres'}" />
  </form>
ENDLOGIN
    if ($fullgraph) {
        my $helpdeskscript;
        my $contactblock = &contactdisplay(\%lt,$servadm,$showadminmail,
                                  $version,$authdomain,\$helpdeskscript);
    }
    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">
// <![CDATA[
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"><b>'.$lt{'forgotpw'}.'</b></a><br />';
    }
    return;
}

sub loginhelpdisplay {
    my (%lt) = @_;
    my $login_help = 1;
    if ($login_help) {
        return '&nbsp;&nbsp;&nbsp;<a href="/adm/loginproblems.html"><b>'.$lt{'help'}.'</b></a>';
    }
    return;
}

sub coursecatalog_link {
    my ($linkname,$fullgraph) = @_;
    my $link = '/adm/coursecatalog';
    if (!$fullgraph) {
        $link.= '?interface=textual';
    }
    return '&nbsp;&nbsp;&nbsp;<a href="/adm/coursecatalog"><b>'.$linkname.'</b></a><br />';
END
}

sub newuser_link {
    my ($linkname) = @_;
    return '&nbsp;&nbsp;&nbsp;<a href="/adm/createaccount"><b>'.$linkname.'</b></a><br />';
}

1;
__END__
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at 
 root@localhost to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
</body></html>