[BACK]Return to lonlogin.pm CVS log [TXT] [DIR] Up to [LON-CAPA] / loncom / auth
File:  [LON-CAPA] / loncom / auth / lonlogin.pm
Revision 1.62: download - view: text, annotated - select for diffs
Thu Dec 30 16:04:37 2004 UTC (19 years, 4 months ago) by raeburn
Branches: MAIN
CVS tags: version_1_3_X, version_1_3_3, version_1_3_2_nsdl, version_1_3_2, version_1_3_1, HEAD
Only display 'Contact Helpdesk' link on log-in page if a valid SupportEmail address has been defined in loncapa.conf.  Also include selected domain in query string passed to help request form when 'Contact Helpdesk' link is followed, so appropriate select boxes are shown.

# The LearningOnline Network
# Login Screen
#
# $Id: lonlogin.pm,v 1.62 2004/12/30 16:04:37 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 CGI::Cookie();
use Apache::File ();
use Apache::lonnet();
use Apache::loncommon();
use Apache::lonauth();
use Apache::lonlocal;

sub handler {
    my $r = shift;
    &Apache::loncommon::no_cache($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 $handle=$lonid->value;
        $handle=~s/\W//g;
        my $lonidsdir=$r->dir_config('lonIDsDir');
        if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
# Indeed, a valid token is found
	    my $bodytag=&Apache::loncommon::bodytag('Already logged in');
	    $r->print(<<ENDFAILED);
<html>
<head>
<title>Already logged in</title>
</head>
$bodytag
<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>
</body>
</html>
ENDFAILED
           return OK;
	}
    }

# ---------------------------------------------------- No valid token, continue

    &Apache::loncommon::get_unprocessed_cgi
     ($ENV{'QUERY_STRING'}.'&'.$ENV{'request.querystring'},
      ['interface','username','domain','firsturl','localpath','localres']);
 

# ----------------------------------------------------------- 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  = $r->dir_config('lonDefDomain');
    if (($ENV{'form.domain'}) && 
	 ($Apache::lonnet::domaindescription{$ENV{'form.domain'}})) {
	$domain=$ENV{'form.domain'};
    }
    my $role    = $r->dir_config('lonRole');
    my $loadlim = $r->dir_config('lonLoadLim');
    my $servadm = $r->dir_config('lonAdmEMail');
    my $sysadm  = $r->dir_config('lonSysEMail');
    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');

# --------------------------------------------- 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 $otherserver='http://'.$ENV{'SERVER_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='';

        foreach my $hostid (keys(%Apache::lonnet::spareid)) {
            next if ($hostid eq $lonhost);
            $spares.='<br /><font size="+1"><a href="http://'.
                $Apache::lonnet::hostname{$hostid}.
                '/adm/login?domain='.$authdomain.'">'.
                $Apache::lonnet::hostname{$hostid}.'</a>'.
                ' (preferred)</font>'.$/;
        }
        $spares.= '<br />';
        foreach my $hostid (keys(%Apache::lonnet::hostname)) {
            next if ($hostid eq $lonhost || $Apache::lonnet::spareid{$hostid});
            $spares.='<br /><a href="http://'.
                $Apache::lonnet::hostname{$hostid}.
                '/adm/login?domain='.$authdomain.'">'.
                $Apache::lonnet::hostname{$hostid}.'</a>';
        }
	$r->print(<<ENDTROUBLE);
<html>
<head><title>The LearningOnline Network with CAPA</title></head>
<body bgcolor="#FFFFFF">
<img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />
<h3>This LON-CAPA server is temporarily not available for login</h3>
<p>Please attempt to login to one of the following servers:</p>$spares
<p>If the problem persists, please contact <tt>$servadm</tt>.</p>
</body>
</html>
ENDTROUBLE
        return OK;
    }

# ----------------------------------------------- Apparently we are in business

    my $domainlogo=&Apache::loncommon::domainlogo($domain);
    $servadm=~s/\,/\<br \/\>/g;
    $sysadm=~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);

# ----------------------------------------------------------------------- Texts

my %lt=&Apache::lonlocal::texthash(
		  'un'  => 'Username',
		  'pw'  => 'Password',
		  'dom' => 'Domain',
		  'perc' => 'percent',
		  'load' => 'Load',
                  'userload' => 'User Load',
                  'about'  => 'aboutlon.gif',
                  'access' => 'accessbutton.gif',
		  'auth' => 'userauthentication.gif',
		  'log' => 'Log in',
		  'help' => 'Help',
		  'serv' => 'Server',
                  'servadm' => 'Server Administration',
                  'sysadm' => 'System Administration',
                  'helpdesk' => 'Contact Helpdesk');

# ---------------------------------------------------------- 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.upass.value
	    =crypted(this.document.client.elements.upass.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="$ENV{'form.interface'}" />
   <input type="hidden" name="uname" value="" />
   <input type="hidden" name="upass" value="" />
   <input type="hidden" name="udom" value="" />
   <input type="hidden" name="imagesuppress"  value="" />
   <input type="hidden" name="appletsuppress"  value="" />
   <input type="hidden" name="embedsuppress"  value="" />
   <input type="hidden" name="fontenhance"  value="" />
   <input type="hidden" name="blackwhite"  value="" />
   <input type="hidden" name="remember"  value="" />
   <input type="hidden" name="localpath" value="$ENV{'form.localpath'}" />
   <input type="hidden" name="localres" value="$ENV{'form.localres'}" />
  </form>
ENDSERVERFORM
    if ($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' and 'about' buttons -->
   <!-- Row 3 Column 1 -->
   <td valign="top" height=60 align="center" bgcolor="$sidebg">
    <a href="/adm/login?interface=textual"><img src="$iconpath/$lt{'access'}" border=0 alt="Accessibility Options" /></a>
    <br />
    <a href="/adm/about.html"><img src="$iconpath/$lt{'about'}" border=0 alt="About LON-CAPA" /></a>
   </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) {
        $r->print(<<ENDACCESSOPTIONS);
<h3>Select Accessibility Options</h3>
<input type="checkbox" name="imagesuppress" /> Suppress rendering of images<br />
<input type="checkbox" name="appletsuppress" /> Suppress Java applets<br />
<input type="checkbox" name="embedsuppress" /> Suppress rendering of embedded multimedia<br />
<input type="checkbox" name="fontenhance" /> Increase font size<br />
<input type="checkbox" name="blackwhite" /> Switch to black and white mode<br />
<p>If you have accessibility needs that are not addressed by this interface, 
please
contact the system administrator at <tt>$sysadm</tt>.</p><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;$lt{'un'}:</b></font></td>
       <td bgcolor="$mainbg"><br /><input type="text" name="uname" size="10" value="$authusername" /></td>
      </tr>
      <tr>
       <td bgcolor="$mainbg"><font size=-1><b>&nbsp;&nbsp;&nbsp;$lt{'pw'}:</b></font></td>
       <td bgcolor="$mainbg"><input type="password" name="upass" size="10" /></td>
      </tr>
      <tr>
       <td bgcolor="$mainbg"><font size=-1><b>&nbsp;&nbsp;&nbsp;$lt{'dom'}:</b></font></td>
       <td bgcolor="$mainbg"><input type="text" name="udom" size="10" value="$authdomain" /></td>
      </tr>
      <tr>
       <td bgcolor="$mainbg">&nbsp;&nbsp;&nbsp;<a href="/adm/loginproblems.html">$lt{'help'}</a></td>
       <td bgcolor="$mainbg" valign="bottom" align="center">
        <br />
        <input type="submit" value="$lt{'log'}" />
       </td>
      </tr>
     </table>
     <!-- End sub-table -->
    </form>
ENDLOGIN
    if ($fullgraph) {
        my $helpdeskscript;
        my $contactblock = &contactdisplay(\%lt,$sysadm,$servadm,$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 ($lt,$sysadm,$servadm,$version,$authdomain,$helpdeskscript) = @_;
    my $contactblock;
    my $showsysadm = 1;
    my $showservadm = 1;
    my $showhelpdesk = 0;
    my $requestmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
    if ($requestmail =~ m/^[^\@]+\@[^\@]+$/) {
        $showhelpdesk = 1;
    }
    if ($showsysadm) {
        $contactblock .= '<b>&nbsp;&nbsp;&nbsp;'.$$lt{'sysadm'}.':</b><br />'.
                         '<tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'.$sysadm.'</tt><br />';
    }
    if ($showservadm) {
        $contactblock .= '<b>&nbsp;&nbsp;&nbsp;'.$$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()">'.$$lt{'helpdesk'}.'</a></b><br />';
        my $thisurl = &Apache::lonnet::escape('/adm/login');
        $$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;
}
 

1;
__END__
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