File:  [LON-CAPA] / modules / relate / lonlogin.pm
Revision 1.11: download - view: text, annotated - select for diffs
Tue Jun 5 12:51:03 2012 UTC (9 years, 11 months ago) by raeburn
Branches: MAIN
CVS tags: loncapaMITrelate_1, HEAD
- Customization for MITrelate
  - Position logos correctly on older browsers.

# The LearningOnline Network
# Login Screen
#
# $Id: lonlogin.pm,v 1.11 2012/06/05 12:51:03 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;
use HTML::Entities();
 
sub handler {
    my $r = shift;

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

# -- 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?
    my $londocroot = $r->dir_config('lonDocRoot'); 
    if (-e "$londocroot/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 ne '') {
        my $lonidsdir=$r->dir_config('lonIDsDir');
        if ($handle=~/^publicuser\_/) {
# For "public user" - remove it, we apparently really want to login
	    unlink("$lonidsdir/$handle.id");
        } else {
# Indeed, a valid token is found
            &Apache::lonnet::transfer_profile_to_env($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.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>'.
                 $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
    my $httpbrowser=$ENV{"HTTP_USER_AGENT"};
    
    my $iconpath= 
	&Apache::loncommon::lonhttpdurl($r->dir_config('lonIconsURL'));

# ----------------------------------------------------------------  

    my $lonhost = $r->dir_config('lonHostID');
    my $domain = &Apache::lonnet::default_login_domain();
    if ($lonhost ne '') {
        my $redirect = &check_loginvia($domain,$lonhost);
        if ($redirect) {
            $r->print($redirect);
            return OK;
        }
    }

    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 $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 $authusername=($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 ($loadpercent,$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 $tokenextras;
    if ($env{'form.role'}) {
        $tokenextras = '&role='.&escape($env{'form.role'});
    }
    if ($env{'form.symb'}) {
        if (!$tokenextras) {
            $tokenextras = '&';
        }
        $tokenextras .= '&symb='.&escape($env{'form.symb'});
    }
    my $logtoken=Apache::lonnet::reply(
       'tmpput:'.$ukey.$lkey.'&'.$firsturl.$tokenextras,
       $lonhost);

# -- If we cannot talk to ourselves, 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');
        }
        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 $hostname) || ($hostname eq ''));
            $spares.='<br /><span style="font-size: larger;"><a href="http://'.
                $hostname.
                '/adm/login?domain='.$authdomain.'">'.
                $hostname.'</a>'.
                ' '.&mt('(preferred)').'</span>'.$/;
	    $last=$hostname;
        }
        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 || $Apache::lonnet::spareid{$hostid});
	    my $hostname = &Apache::lonnet::hostname($hostid);
            next if (($last eq $hostname) || ($hostname eq ''));
            $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("This Mechanics Online course server is temporarily not available for login.").'</h3>'
          .'</body>'
          .'</html>'
        );
        return OK;
    }

# ----------------------------------------------- Apparently we are in business
    $servadm=~s/\,/\<br \/\>/g;

# ----------------------------------------------------------------------- Texts
    my $pagetitle = 'Mechanics Online Log-in'; # Do not localize.
    my %lt=&Apache::lonlocal::texthash(
          'needu'    => 'You must provide a username',
          'needp'    => 'You must provide a password',
          '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',
          'exist'    => 'Existing user - sign-up with existing username',
          'create'   => 'New user - create username and sign-up',
          'already'  => 'Already signed up?',
          'forgotpw' => 'Forgot your password?',
          'newuser'  => 'New User?',
          'click'   => 'Click here to sign up',
          'plea'    => 'Please log-in',
          'supp'    => 'Support from NSF, NIH, Google',
          'note'    => 'Please Note:',
          'jscr'    => 'Javascript must be enabled in your web browser in order to use this web site.',
       );
# ----------------------------------------------------------- Front page design
    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 $showadminmail=&Apache::loncommon::designparm('login.adminmail',$domain);

    my $helpdeskscript;
    my $contactblock = &contactdisplay(\%lt,$servadm,$showadminmail,
                                       $authdomain,\$helpdeskscript);

# -------------------------------------------------- Change password field name
    my $now=time;

# ---------------------------------------- Assemble Javascript to put in <head>


    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("$lt{'needu'}");
        return false;
    }
    if (document.client.upass$now.value == "" || 
        !document.client.upass$now.value) {
       alert("$lt{'needp'}");
       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;

    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;
}

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;
}

function SubmitSignUp() {
    if (document.signup.usertype[0].checked == true) {
        document.signup.action = '/adm/createaccount';
    }
    if (document.signup.usertype[1].checked == true) {
        document.signup.action = '/adm/selfenroll';
    }
    return true;
}

// ]]>
</script>

$helpdeskscript

ENDSCRIPT

# --------------------------------------------------- Print login screen header
    my %add_entries = (
               bgcolor      => "$mainbg",
               text         => "$font",
               link         => "$link",
               vlink        => "$vlink",
               alink        => "$alink",
               onload       => 'javascript:enableInput();',);

    my $css_url = "/css/relate/login.css";
    $js .= "\n".'<link type="text/css" rel="stylesheet" href="'.$css_url.'" />'."\n";
    $r->print(&Apache::loncommon::start_page($pagetitle,$js,
                                       {'redirect'   => [$expire,'/adm/roles'], 
                                        'add_entries' => \%add_entries,
                                        'only_body'   => 1,}));

# ------------------------------------------------------------ Additional Texts
    $lt{'newto'} = &mt('New to the [_1]Mechanics Online[_2] site?','<i>','</i>');
    $lt{'mech'} = &mt('Mechanics Online is a Newtonian Mechanics course developed by Professor David Pritchard and the RELATE education group at MIT. [_1]Learn more[_2]','<a href="http://relate.mit.edu/physicscourse" style="text-decoration: underline;">','</a>');
    $lt{'runson'} = &mt('Mechanics Online runs on [_1]LON-CAPA[_2] - an open source, freeware, distributed learning content management and assessment system.',
                        '<a href="http://loncapa.org/" style="text-decoration: underline;">',
                        '</a>');
    $lt{'newhere'} = &mt('New to [_1]Mechanics Online[_2]:','<i>','</i>');
    $lt{'browser'} = &mt('Your browser must allow [_1]cookies[_2]',
                         '<a href="http://loncapa.msu.edu/cookies.html" style="color: #ffffff; text-decoration:underline;">','</a>');

    my ($contactrow,$domainrow,$serverrow,$loadrow,$userloadrow,$versionrow);
    $contactrow = <<"END";
      <tr>
       <td align="left" colspan="2">
       $contactblock
       </td>
      </tr>
END
    $domainrow = <<"END";
      <tr>
       <td align="left" valign="top">
        <small><b>$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 -->')) {
        $versionrow = <<"END";
      <tr>
       <td colspan="2" align="left">
        <a href="/adm/about.html">
        <img src="/images/login/lclogosm.gif" width="16" height="14" alt="LC" border="0" />&nbsp;<small>$version</small></a>
       </td>
      </tr>
END
    }

# -------------------------------------------- Static cid for prerequisite test
    my $prereqcid = 'relate_2764113e81b9e4f0crelatel1';

# ---------------------------------------------------- Warning if no Javascript 
    my $noscript_warning = '<noscript><br /><span class="LC_warning">'.
                           '<b>'.$lt{'note'}.'</b>'.$lt{'jscr'}.
                           '</span></noscript>';

# ---------------------------------------------------- Serve out DES JavaScript
    {
        my $jsh=Apache::File->new($include."/londes.js");
        $r->print(<$jsh>);
    }
# ---------------------------------------------------------- Serve rest of page

    $r->print(<<"ENDLOGIN");
<br />
<div align="center">
<table class="LC_loginbox">
  <tr>
    <td align="left" valign="top" width="11"><img src="/images/login/tlc_11_ffffff_e2e2e2.gif" width="10" height="10" border="0" alt="" /></td>
    <td width="450" valign="top">
      <table class="LC_loginbox_left">
        <tr>
          <td width="441" align="left"><br />
           <img src="/images/login/LCrelateheader_sm.png" width="441" height="100" alt="Relate @ MIT" align="left" /></td>
        </tr>
        <tr>
         <td>
          <div align="left" style="display:block; margin-top:5px; margin-bottom:5px; margin-left:0px; margin-right:0px; width:440px; height:5px;">
           <div class="divider">
            </div>
          </div>
        </td>
       </tr>
      </table>
      <table class="LC_loginbox_left">
       <tr>
        <td width="10">&nbsp;</td>
        <td valign="top" class="bodyred" width="430" align="left"><br />
         <span style="font-size: 18px; line-height: 22px; ">$lt{'newto'}</span>
         <p class="bodyred">$lt{'mech'}</p>
         <p class="bodyred">$lt{'runson'}</p>
         <fieldset><legend><span style="font-size:larger;">Sign-up for Summer (course begins: June 14th)</span></legend>
         <form name="signup" method="post" action="/adm/createaccount" onsubmit="return SubmitSignUp();">
         <input type="hidden" name="courseid" value="$prereqcid" /> 
         <input type="hidden" name="process" value="signup" />
         <span class="LC_nobreak">
          <label>
           <input type="radio" name="usertype" value="newuser" checked="checked" />$lt{'create'}
          </label></span><br />
          <span class="LC_nobreak"><label>
           <input type="radio" name="usertype" value="existing" />$lt{'exist'}
           </label>
           <input type="hidden" name="phase" value="login" />
         </span><br /><br />
         <input name="signin" type="submit" value="$lt{'click'}" class="buttonred" />
         </form>
         </fieldset>
        </td>
       </tr>
      </table>
     </td>
     <td width="10">&nbsp;</td>
     <td valign="top">
      <form name="client" method="post" onsubmit="return(send());" action="">
      <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/tlc_11_993333_ffffff.gif" width="10" height="10" border="0" alt="" /></td>
        <td>&nbsp;</td>
        <td align="right" valign="top" width="11" height="11"><img src="/images/login/tr_11_993333_ffffff.gif" 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;">
             $lt{'already'}</span>
             <br />$lt{'plea'}<br />
             <hr class="login" /><br /><br />
            </td>
           </tr>
           <tr>
            <td>
             <table border="0" cellpadding="2" cellspacing="0">
              <tr>
               <td align="right" class="bodywhite"><label>$lt{'un'}</label>:</td>
               <td align="right"><input type="text" name="uname" size="17" value="" /></td>
               </tr>
               <tr>
                <td align="right" class="bodywhite"><label>$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="$lt{'log'}" class="buttonwhite" /></td>
               </tr>
              </table>
             </td>
            </tr>
            <tr>
             <td align="right" valign="top" class="bodywhite">
              <br />
              <br />
              <span style="font-size: smaller;">$lt{'browser'}</span><br />
              <hr class="login" />
              <br />
              <a href="/adm/resetpw" style="color: #ffffff; text-decoration:underline;">$lt{'forgotpw'}</a><br />
              <br />
             </td>
            </tr>
           </table>
          </td>
          <td width="9">&nbsp;</td>
        </tr>
        <tr>
          <td align="left" valign="bottom" width="11" height="11"><img src="/images/login/bl_11_993333_ffffff.gif" width="11" height="11" border="0" alt="" /></td>
          <td>&nbsp;</td>
          <td align="right" valign="bottom" width="11" height="11"><img src="/images/login/br_11_993333_ffffff.gif" width="11" height="11" border="0" alt="" /></td>
        </tr>
      </table>
      <input type="hidden" name="lextkey" value="$lextkey" />
      <input type="hidden" name="uextkey" value="$uextkey" />
      </form>
    </td>
    <td align="right" valign="top" width="11"><img src="/images/login/tr_11_ffffff_e2e2e2.gif" width="11" height="11" border="0" alt="" /></td>
  </tr>
  <tr>
   <td width="10">&nbsp;</td>
   <td colspan="3">
    <br />
    $noscript_warning
    <hr style="clear:both;" />
   </td>
   <td width="10">&nbsp;</td>
  </tr>
  <tr>
    <td width="10">&nbsp;</td>
    <td colspan="4">
    <div style="float: left;">
     <table border="0" cellspacing="0" cellpadding="0">
$contactrow
$domainrow
$serverrow
$loadrow
$userloadrow
$versionrow
     </table>
    </div>
    <div style="float: right; width:300px;">
     <img src="/images/login/sponsors.png" alt="$lt{'supp'}" align="right" width="267" height="100" valign="top" />
    <br style="clear:both;" />
    </div>
   </td>
  </tr>
  <tr>
    <td align="left" valign="bottom" width="11"><img src="/images/login/bl_11_ffffff_e2e2e2.gif" 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/br_11_ffffff_e2e2e2.gif" width="11" height="11" border="0" alt="" /></td>
  </tr>
</table>
</div>
<p>&nbsp;</p>
  <form name="server" action="/adm/authenticate" method="post" target="_top">
   <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="upass1" value="" />
   <input type="hidden" name="upass2" 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>

<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>

ENDLOGIN

# -------------------------------------------------------- Standard page ending 
    my %endargs = ( 'noredirectlink' => 1, );
    $r->print(&Apache::loncommon::end_page(\%endargs));
    return OK;
}

sub check_loginvia {
    my ($domain,$lonhost) = @_;
    if ($domain eq '' || $lonhost eq '') {
        return;
    }
    my %domconfhash = &Apache::loncommon::get_domainconf($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 = $ENV{'REMOTE_ADDR'};
        if ($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 '') {
                    $output = &redirect_page($newhost,$path);
                }
            }
        }
    }
    return $output;
}

sub redirect_page {
    my ($desthost,$path) = @_;
    my $protocol = $Apache::lonnet::protocol{$desthost};
    $protocol = 'http' if ($protocol ne 'https');
    unless ($path =~ m{^/}) {
        $path = '/'.$path;
    }
    my $url = $protocol.'://'.&Apache::lonnet::hostname($desthost).$path;
    if ($env{'form.firsturl'} ne '') {
        $url .='?firsturl='.$env{'form.firsturl'};
    }
    my $start_page = &Apache::loncommon::start_page('Switching Server ...',undef,
                                                    {'redirect' => [0,$url],});
    my $end_page   = &Apache::loncommon::end_page();
    return $start_page.$end_page;
}

sub contactdisplay {
    my ($lt,$servadm,$showadminmail,$authdomain,$helpdeskscript) = @_;
    return unless(ref($lt) eq 'HASH');
    my $contactblock;
    my $showhelpdesk = 0;
    my $requestmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
    if ($requestmail =~ m/^[^\@]+\@[^\@]+$/) {
        $showhelpdesk = 1;
    }
    if ($servadm && $showadminmail) {
        $contactblock .= $lt->{'servadm'}.':<br />'.
                         '<tt>'.$servadm.'</tt><br />';
    }
    if ($showhelpdesk) {
        $contactblock .= '<a href="javascript:helpdesk()" style="text-decoration:underline;">'.$lt->{'helpdesk'}.'</a><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
    }
    return $contactblock;
}

1;
__END__

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