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# The LearningOnline Network
# Preferences
#
# $Id: lonpreferences.pm,v 1.33 2003/11/08 01:45:26 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/
#
# (Internal Server Error Handler
#
# (Login Screen
# 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14,
# 1/14/00,5/29,5/30,6/1,6/29,7/1,11/9 Gerd Kortemeyer)
#
# 3/1/1 Gerd Kortemeyer)
#
# 3/1 Gerd Kortemeyer
#
# 2/13/02 2/14 2/15 Matthew Hall
#
# This package uses the "londes.js" javascript code. 
#
# TODOs that have to be completed:
#    interface with lonnet to change the password
 
package Apache::lonpreferences;

use strict;
use Apache::Constants qw(:common);
use Apache::File;
use Crypt::DES;
use DynaLoader; # for Crypt::DES version
use Apache::loncommon();
use Apache::lonhtmlcommon();
use Apache::lonlocal;

#
# Write lonnet::passwd to do the call below.
# Use:
#   my $answer=reply("encrypt:passwd:$udom:$uname:$upass",$tryserver);
#
##################################################
#          password associated functions         #
##################################################
sub des_keys {
    # Make a new key for DES encryption.
    # Each key has two parts which are returned seperately.
    # Please note:  Each key must be passed through the &hex function
    # before it is output to the web browser.  The hex versions cannot
    # be used to decrypt.
    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)];
    }
    return ($lkey,$ukey);
}

sub des_decrypt {
    my ($key,$cyphertext) = @_;
    my $keybin=pack("H16",$key);
    my $cypher;
    if ($Crypt::DES::VERSION>=2.03) {
        $cypher=new Crypt::DES $keybin;
    } else {
        $cypher=new DES $keybin;
    }
    my $plaintext=
	$cypher->decrypt(unpack("a8",pack("H16",substr($cyphertext,0,16))));
    $plaintext.=
	$cypher->decrypt(unpack("a8",pack("H16",substr($cyphertext,16,16))));
    $plaintext=substr($plaintext,1,ord(substr($plaintext,0,1)) );
    return $plaintext;
}

################################################################
#                       Handler subroutines                    #
################################################################

################################################################
#         Language Change Subroutines                          #
################################################################
sub languagechanger {
    my $r = shift;
    my $user       = $ENV{'user.name'};
    my $domain     = $ENV{'user.domain'};
    my %userenv = &Apache::lonnet::get
        ('environment',['languages']);
    my $language=$userenv{'languages'};

    my $bodytag=&Apache::loncommon::bodytag(
              'Change Your Language Preferences');
    my $pref=&mt('Preferred language');
    my %langchoices=('' => 'No language preference');
    foreach (&Apache::loncommon::languageids()) {
	if (&Apache::loncommon::supportedlanguagecode($_)) {
	    $langchoices{&Apache::loncommon::supportedlanguagecode($_)}
	               = &Apache::loncommon::plainlanguagedescription($_);
	}
    }
    my $selectionbox=&Apache::loncommon::select_form($language,'language',
						     %langchoices);
    $r->print(<<ENDLSCREEN);
<html>
$bodytag

<form name="server" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="verify_and_change_languages" />
<br />$pref: $selectionbox
ENDLSCREEN
    $r->print('<br /><input type="submit" value="'.&mt('Change').'" /></form></body></html>');
}


sub verify_and_change_languages {
    my $r = shift;
    my $user       = $ENV{'user.name'};
    my $domain     = $ENV{'user.domain'};
# Screenname
    my $newlanguage  = $ENV{'form.language'};
    $newlanguage=~s/[^\-\w]//g;
    my $message='';
    if ($newlanguage) {
        &Apache::lonnet::put('environment',{'languages' => $newlanguage});
        &Apache::lonnet::appenv('environment.languages' => $newlanguage);
        $message='Set new preferred languages to '.$newlanguage;
    } else {
        &Apache::lonnet::del('environment',['languages']);
        &Apache::lonnet::delenv('environment\.languages');
        $message='Reset preferred language';
    }
    my $bodytag=&Apache::loncommon::bodytag(
                    'Change Your Language Preferences');
    $r->print(<<ENDVCSCREEN);
<html>
$bodytag
</p>
$message
</body></html>
ENDVCSCREEN
}


################################################################
#         Anonymous Discussion Name Change Subroutines         #
################################################################
sub screennamechanger {
    my $r = shift;
    my $user       = $ENV{'user.name'};
    my $domain     = $ENV{'user.domain'};
    my %userenv = &Apache::lonnet::get
        ('environment',['screenname','nickname']);
    my $screenname=$userenv{'screenname'};
    my $nickname=$userenv{'nickname'};
    my $bodytag=&Apache::loncommon::bodytag(
              'Change Your Nickname and Anonymous Screen Name');
    $r->print(<<ENDSCREEN);
<html>
$bodytag

<form name="server" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="verify_and_change_screenname" />
<br />New screenname (shown if you post anonymously):
<input type="text" size="20" value="$screenname" name="screenname" />
<br />New nickname (shown if you post non-anonymously):
<input type="text" size="20" value="$nickname" name="nickname" />
<input type="submit" value="Change" />
</form>
</body>
</html>
ENDSCREEN
}

sub verify_and_change_screenname {
    my $r = shift;
    my $user       = $ENV{'user.name'};
    my $domain     = $ENV{'user.domain'};
# Screenname
    my $newscreen  = $ENV{'form.screenname'};
    $newscreen=~s/[^ \w]//g;
    my $message='';
    if ($newscreen) {
        &Apache::lonnet::put('environment',{'screenname' => $newscreen});
        &Apache::lonnet::appenv('environment.screenname' => $newscreen);
        $message='Set new screenname to '.$newscreen;
    } else {
        &Apache::lonnet::del('environment',['screenname']);
        &Apache::lonnet::delenv('environment\.screenname');
        $message='Reset screenname';
    }
# Nickname
    $message.='<br />';
    $newscreen  = $ENV{'form.nickname'};
    $newscreen=~s/[^ \w]//g;
    if ($newscreen) {
        &Apache::lonnet::put('environment',{'nickname' => $newscreen});
        &Apache::lonnet::appenv('environment.nickname' => $newscreen);
        $message.='Set new nickname to '.$newscreen;
    } else {
        &Apache::lonnet::del('environment',['nickname']);
        &Apache::lonnet::delenv('environment\.nickname');
        $message.='Reset nickname';
    }

    my $bodytag=&Apache::loncommon::bodytag(
                    'Change Your Nickname and Anonymous Screen Name');
    $r->print(<<ENDVCSCREEN);
<html>
$bodytag
</p>
$message
</body></html>
ENDVCSCREEN
}

################################################################
#         Message Forward                                      #
################################################################

sub msgforwardchanger {
    my $r = shift;
    my $user       = $ENV{'user.name'};
    my $domain     = $ENV{'user.domain'};
    my %userenv = &Apache::lonnet::get('environment',['msgforward','notification','critnotification']);
    my $msgforward=$userenv{'msgforward'};
    my $notification=$userenv{'notification'};
    my $critnotification=$userenv{'critnotification'};
    my $bodytag=&Apache::loncommon::bodytag(
                    'Change Your Message Forwarding and Notification');
    my $forwardingHelp = Apache::loncommon::help_open_topic("Prefs_Forwarding",
							    "What are forwarding ".
							    "and notification ".
							    "addresses");
    my $criticalMessageHelp = Apache::loncommon::help_open_topic("Course_Critical_Message",
								 "What are critical messages");

    $r->print(<<ENDMSG);
<html>
$bodytag
$forwardingHelp <br />
<form name="server" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="verify_and_change_msgforward" />
New Forwarding Address(es) (<tt>user:domain,user:domain,...</tt>):
<input type="text" size="40" value="$msgforward" name="msgforward" /><hr />
New Message Notification Email Address(es) (<tt>joe\@doe.com,jane\@doe.edu,...</tt>):
<input type="text" size="40" value="$notification" name="notification" /><hr />
New Critical Message Notification Email Address(es) (<tt>joe\@doe.com,jane\@doe.edu,...</tt>):
<input type="text" size="40" value="$critnotification" name="critnotification" />$criticalMessageHelp<hr />
<input type="submit" value="Change" />
</form>
</body>
</html>
ENDMSG
}

sub verify_and_change_msgforward {
    my $r = shift;
    my $user       = $ENV{'user.name'};
    my $domain     = $ENV{'user.domain'};
    my $newscreen  = '';
    my $message='';
    foreach (split(/\,/,$ENV{'form.msgforward'})) {
	my ($msuser,$msdomain)=split(/[\@\:]/,$_);
        $msuser=~s/\W//g;
        $msdomain=~s/\W//g;
        if (($msuser) && ($msdomain)) {
	    if (&Apache::lonnet::homeserver($msuser,$msdomain) ne 'no_host') {
               $newscreen.=$msuser.':'.$msdomain.',';
	   } else {
               $message.='No such user: '.$msuser.':'.$msdomain.'<br>';
           }
        }
    }
    $newscreen=~s/\,$//;
    if ($newscreen) {
        &Apache::lonnet::put('environment',{'msgforward' => $newscreen});
        &Apache::lonnet::appenv('environment.msgforward' => $newscreen);
        $message.='Set new message forwarding to '.$newscreen.'<br />';
    } else {
        &Apache::lonnet::del('environment',['msgforward']);
        &Apache::lonnet::delenv('environment\.msgforward');
        $message.='Reset message forwarding<br />';
    }
    my $notification=$ENV{'form.notification'};
    $notification=~s/\s//gs;
    if ($notification) {
        &Apache::lonnet::put('environment',{'notification' => $notification});
        &Apache::lonnet::appenv('environment.notification' => $notification);
        $message.='Set message notification address to '.$notification.'<br />';
    } else {
        &Apache::lonnet::del('environment',['notification']);
        &Apache::lonnet::delenv('environment\.notification');
        $message.='Reset message notification<br />';
    }
    my $critnotification=$ENV{'form.critnotification'};
    $critnotification=~s/\s//gs;
    if ($critnotification) {
        &Apache::lonnet::put('environment',{'critnotification' => $critnotification});
        &Apache::lonnet::appenv('environment.critnotification' => $critnotification);
        $message.='Set critical message notification address to '.$critnotification;
    } else {
        &Apache::lonnet::del('environment',['critnotification']);
        &Apache::lonnet::delenv('environment\.critnotification');
        $message.='Reset critical message notification<br />';
    }
    my $bodytag=&Apache::loncommon::bodytag(
                           'Change Your Message Forwarding and Notifications');
    $r->print(<<ENDVCMSG);
<html>
$bodytag
</p>
$message
</body></html>
ENDVCMSG
}

################################################################
#         Colors                                               #
################################################################

sub colorschanger {
    my $r = shift;
    my $bodytag=&Apache::loncommon::bodytag(
                    'Change Color Scheme for Current Role Type','',
                    'onUnload="pclose();"');
# figure out colors
    my $function='student';
    if ($ENV{'request.role'}=~/^(cc|in|ta|ep)/) {
	$function='coordinator';
    }
    if ($ENV{'request.role'}=~/^(su|dc|ad|li)/) {
	$function='admin';
    }
    if (($ENV{'request.role'}=~/^(au|ca)/) ||
	($ENV{'REQUEST_URI'}=~/^(\/priv|\~)/)) {
	$function='author';
    }
    my $domain=&Apache::loncommon::determinedomain();
    my %colortypes=('pgbg'  => 'Page Background',
                    'tabbg' => 'Header Background',
                    'sidebg'=> 'Header Border',
                    'font'  => 'Font',
                    'link'  => 'Un-Visited Link',
                    'vlink' => 'Visited Link',
                    'alink' => 'Active Link');
    my $chtable='';
    foreach my $item (sort(keys(%colortypes))) {
       my $curcol=&Apache::loncommon::designparm($function.'.'.$item,$domain);
       $chtable.='<tr><td>'.$colortypes{$item}.'</td><td bgcolor="'.$curcol.
        '">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td><input name="'.$item.
        '" size="10" value="'.$curcol.
'" /></td><td><a href="javascript:pjump('."'color_custom','".$colortypes{$item}.
"','".$curcol."','"
	    .$item."','parmform.pres','psub'".');">Select</a></td></tr>';
    }
    my $pjump_def = &Apache::lonhtmlcommon::pjump_javascript_definition();
    $r->print(<<ENDCOL);
<html>
<script>

    function pclose() {
        parmwin=window.open("/adm/rat/empty.html","LONCAPAparms",
                 "height=350,width=350,scrollbars=no,menubar=no");
        parmwin.close();
    }

    $pjump_def

    function psub() {
        pclose();
        if (document.parmform.pres_marker.value!='') {
            if (document.parmform.pres_type.value!='') {
                eval('document.server.'+
                     document.parmform.pres_marker.value+
		     '.value=document.parmform.pres_value.value;');
	    }
        } else {
            document.parmform.pres_value.value='';
            document.parmform.pres_marker.value='';
        }
    }


</script>
$bodytag
<form name="parmform">
<input type="hidden" name="pres_marker" />
<input type="hidden" name="pres_type" />
<input type="hidden" name="pres_value" />
</form>
<form name="server" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="verify_and_change_colors" />
<table border="2">
$chtable
</table>
<input type="submit" value="Change Custom Colors" />
<input type="submit" name="resetall" value="Reset All Colors to Default" />
</form>
</body>
</html>
ENDCOL
}

sub verify_and_change_colors {
    my $r = shift;
# figure out colors
    my $function='student';
    if ($ENV{'request.role'}=~/^(cc|in|ta|ep)/) {
	$function='coordinator';
    }
    if ($ENV{'request.role'}=~/^(su|dc|ad|li)/) {
	$function='admin';
    }
    if (($ENV{'request.role'}=~/^(au|ca)/) ||
	($ENV{'REQUEST_URI'}=~/^(\/priv|\~)/)) {
	$function='author';
    }
    my $domain=&Apache::loncommon::determinedomain();
    my %colortypes=('pgbg'  => 'Page Background',
                    'tabbg' => 'Header Background',
                    'sidebg'=> 'Header Border',
                    'font'  => 'Font',
                    'link'  => 'Un-Visited Link',
                    'vlink' => 'Visited Link',
                    'alink' => 'Active Link');

    my $message='';
    foreach my $item (keys %colortypes) {
        my $color=$ENV{'form.'.$item};
        my $entry='color.'.$function.'.'.$item;
	if (($color=~/^\#[0-9A-Fa-f]{6}$/) && (!$ENV{'form.resetall'})) {
	    &Apache::lonnet::put('environment',{$entry => $color});
	    &Apache::lonnet::appenv('environment.'.$entry => $color);
	    $message.='Set '.$colortypes{$item}.' to '.$color.'<br />';
	} else {
	    &Apache::lonnet::del('environment',[$entry]);
	    &Apache::lonnet::delenv('environment\.'.$entry);
	    $message.='Reset '.$colortypes{$item}.'<br />';
	}
    }
    my $bodytag=&Apache::loncommon::bodytag(
                           'Change Color Scheme for Current Role Type');
    $r->print(<<ENDVCCOL);
<html>
$bodytag
</p>
$message
<form name="client" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="changecolors" />
<input type="submit" value="Revise color scheme again" />
</form>
</body></html>
ENDVCCOL
}

######################################################
#            password handler subroutines            #
######################################################
sub passwordchanger {
    # This function is a bit of a mess....
    # Passwords are encrypted using londes.js (DES encryption)
    my $r = shift;
    my $errormessage = shift;
    $errormessage = ($errormessage || '');
    my $user       = $ENV{'user.name'};
    my $domain     = $ENV{'user.domain'};
    my $homeserver = $ENV{'user.home'};
    my $currentauth=&Apache::lonnet::queryauthenticate($user,$domain);
    # Check for authentication types that allow changing of the password.
    return if ($currentauth !~ /^(unix|internal):/);
    #
    # Generate keys
    my ($lkey_cpass ,$ukey_cpass ) = &des_keys();
    my ($lkey_npass1,$ukey_npass1) = &des_keys();
    my ($lkey_npass2,$ukey_npass2) = &des_keys();
    # Store the keys in the log files
    my $lonhost = $r->dir_config('lonHostID');
    my $logtoken=Apache::lonnet::reply('tmpput:'
				       .$ukey_cpass  . $lkey_cpass .'&'
				       .$ukey_npass1 . $lkey_npass1.'&'
				       .$ukey_npass2 . $lkey_npass2,
				       $lonhost);
    # Hexify the keys for output as javascript variables
    $ukey_cpass = hex($ukey_cpass);
    $lkey_cpass = hex($lkey_cpass);
    $ukey_npass1= hex($ukey_npass1);
    $lkey_npass1= hex($lkey_npass1);
    $ukey_npass2= hex($ukey_npass2);
    $lkey_npass2= hex($lkey_npass2);
    # Output javascript to deal with passwords
    # Output DES javascript
    $r->print("<html><head>");
    {
	my $include = $r->dir_config('lonIncludes');
	my $jsh=Apache::File->new($include."/londes.js");
	$r->print(<$jsh>);
    }
    my $bodytag=&Apache::loncommon::bodytag('Change Password','',
                                         'onLoad="init();"');
    $r->print(<<ENDFORM);
</head>
$bodytag

<script language="JavaScript">

    function send() {
        uextkey=this.document.client.elements.ukey_cpass.value;
        lextkey=this.document.client.elements.lkey_cpass.value;
        initkeys();

        this.document.server.elements.currentpass.value
            =crypted(this.document.client.elements.currentpass.value);

        uextkey=this.document.client.elements.ukey_npass1.value;
        lextkey=this.document.client.elements.lkey_npass1.value;
        initkeys();
        this.document.server.elements.newpass_1.value
            =crypted(this.document.client.elements.newpass_1.value);

        uextkey=this.document.client.elements.ukey_npass2.value;
        lextkey=this.document.client.elements.lkey_npass2.value;
        initkeys();
        this.document.server.elements.newpass_2.value
            =crypted(this.document.client.elements.newpass_2.value);

        this.document.server.submit();
    }

</script>
$errormessage

<p>
<!-- We seperate the forms into 'server' and 'client' in order to
     ensure that unencrypted passwords will not be sent out by a
     crappy browser -->

<form name="server" action="/adm/preferences" method="post">
<input type="hidden" name="logtoken"    value="$logtoken" />
<input type="hidden" name="action"      value="verify_and_change_pass" />
<input type="hidden" name="currentpass" value="" />
<input type="hidden" name="newpass_1"   value="" />
<input type="hidden" name="newpass_2"   value="" />
</form>

<form name="client" >
<table>
<tr><td align="right"> Current password:                      </td>
    <td><input type="password" name="currentpass" size="10"/> </td></tr>
<tr><td align="right"> New password:                          </td>
    <td><input type="password" name="newpass_1" size="10"  /> </td></tr>
<tr><td align="right"> Confirm password:                      </td>
    <td><input type="password" name="newpass_2" size="10"  /> </td></tr>
<tr><td colspan="2" align="center">
    <input type="button" value="Change Password" onClick="send();">
</table>
<input type="hidden" name="ukey_cpass"  value="$ukey_cpass" />
<input type="hidden" name="lkey_cpass"  value="$lkey_cpass" />
<input type="hidden" name="ukey_npass1" value="$ukey_npass1" />
<input type="hidden" name="lkey_npass1" value="$lkey_npass1" />
<input type="hidden" name="ukey_npass2" value="$ukey_npass2" />
<input type="hidden" name="lkey_npass2" value="$lkey_npass2" />
</form>
</p>
ENDFORM
    #
    return;
}

sub verify_and_change_password {
    my $r = shift;
    my $user       = $ENV{'user.name'};
    my $domain     = $ENV{'user.domain'};
    my $homeserver = $ENV{'user.home'};
    my $currentauth=&Apache::lonnet::queryauthenticate($user,$domain);
    # Check for authentication types that allow changing of the password.
    return if ($currentauth !~ /^(unix|internal):/);
    #
    $r->print(<<ENDHEADER);
<html>
<head>
<title>LON-CAPA Preferences:  Change password for $user</title>
</head>
ENDHEADER
    #
    my $currentpass = $ENV{'form.currentpass'}; 
    my $newpass1    = $ENV{'form.newpass_1'}; 
    my $newpass2    = $ENV{'form.newpass_2'};
    my $logtoken    = $ENV{'form.logtoken'};
    # Check for empty data 
    unless (defined($currentpass) && 
	    defined($newpass1)    && 
	    defined($newpass2)    ){
	&passwordchanger($r,"<p>\n<font color='#ff0000'>ERROR</font>".
			 "Password data was blank.\n</p>");
	return;
    }
    # Get the keys
    my $lonhost = $r->dir_config('lonHostID');
    my $tmpinfo = Apache::lonnet::reply('tmpget:'.$logtoken,$lonhost);
    if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
        # I do not a have a better idea about how to handle this
	$r->print(<<ENDERROR);
<p>
<font color="#ff0000">ERROR:</font> Unable to retrieve stored token for
password decryption.  Please log out and try again.
</p>
ENDERROR
        # Probably should log an error here
        return;
    }
    my ($ckey,$n1key,$n2key)=split(/&/,$tmpinfo);
    # 
    $currentpass = &des_decrypt($ckey ,$currentpass);
    $newpass1    = &des_decrypt($n1key,$newpass1);
    $newpass2    = &des_decrypt($n2key,$newpass2);
    # 
    if ($newpass1 ne $newpass2) {
	&passwordchanger($r,
			 '<font color="#ff0000">ERROR:</font>'.
			 'The new passwords you entered do not match.  '.
			 'Please try again.');
	return;
    }
    if (length($newpass1) < 7) {
	&passwordchanger($r,
			 '<font color="#ff0000">ERROR:</font>'.
			 'Passwords must be a minimum of 7 characters long.  '.
			 'Please try again.');
	return;
    }
    #
    # Check for bad characters
    my $badpassword = 0;
    foreach (split(//,$newpass1)) {
	$badpassword = 1 if ((ord($_)<32)||(ord($_)>126));
    }
    if ($badpassword) {
	# I can't figure out how to enter bad characters on my browser.
	&passwordchanger($r,<<ENDERROR);
<font color="#ff0000">ERROR:</font>
The password you entered contained illegal characters.<br />
Valid characters are: space and <br />
<pre>
!&quot;\#$%&amp;\'()*+,-./0123456789:;&lt;=&gt;?\@
ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_\`abcdefghijklmnopqrstuvwxyz{|}~
</pre>
ENDERROR
    }
    # 
    # Change the password (finally)
    my $result = &Apache::lonnet::changepass
	($user,$domain,$currentpass,$newpass1,$homeserver);
    # Inform the user the password has (not?) been changed
    if ($result =~ /^ok$/) {
	$r->print(<<"ENDTEXT");
<h2>The password for $user was successfully changed</h2>
ENDTEXT
    } else {
	# error error: run in circles, scream and shout
        $r->print(<<ENDERROR);
<h2><font color="#ff0000">The password for $user was not changed</font></h2>
Please make sure your old password was entered correctly.
ENDERROR
    }
    return;
}

######################################################
#            other handler subroutines               #
######################################################

################################################################
#                          Main handler                        #
################################################################
sub handler {
    my $r = shift;
    my $user = $ENV{'user.name'};
    my $domain = $ENV{'user.domain'};
    &Apache::loncommon::content_type($r,'text/html');
    # Some pages contain DES keys and should not be cached.
    &Apache::loncommon::no_cache($r);
    $r->send_http_header;
    return OK if $r->header_only;
    #
    if ($ENV{'form.action'} eq 'changepass') {
	&passwordchanger($r);
    } elsif ($ENV{'form.action'} eq 'verify_and_change_pass') {
	&verify_and_change_password($r);
    } elsif ($ENV{'form.action'} eq 'changescreenname') {
        &screennamechanger($r);
    } elsif ($ENV{'form.action'} eq 'verify_and_change_screenname') {
        &verify_and_change_screenname($r);
    } elsif ($ENV{'form.action'} eq 'changemsgforward') {
        &msgforwardchanger($r);
    } elsif ($ENV{'form.action'} eq 'verify_and_change_msgforward') {
        &verify_and_change_msgforward($r);
    } elsif ($ENV{'form.action'} eq 'changecolors') {
        &colorschanger($r);
    } elsif ($ENV{'form.action'} eq 'verify_and_change_colors') {
        &verify_and_change_colors($r);
    } elsif ($ENV{'form.action'} eq 'changelanguages') {
        &languagechanger($r);
    } elsif ($ENV{'form.action'} eq 'verify_and_change_languages') {
        &verify_and_change_languages($r);
    } elsif ($ENV{'form.action'} eq 'debugtoggle') {
	if (($ENV{'user.name'} eq 'albertel' ) ||
            ($ENV{'user.name'} eq 'kortemey' ) ||
            ($ENV{'user.name'} eq 'korte')) {
	    if ($ENV{'user.debug'}) {
		&Apache::lonnet::delenv('user\.debug');
	    } else {
		&Apache::lonnet::appenv('user.debug' => 1);
	    }
	}
    } else {
	$r->print(<<ENDHEADER);
<html>
<head>
<title>LON-CAPA Preferences</title>
</head>
ENDHEADER
        $r->print(&Apache::loncommon::bodytag('Change Your Preferences'));
	# Determine current authentication method
	my $currentauth=&Apache::lonnet::queryauthenticate($user,$domain);
	if ($currentauth =~ /^(unix|internal):/) {
	    $r->print(<<ENDPASSWORDFORM);
<form name="client" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="changepass" />
<input type="submit" value="Change password" />
</form>
ENDPASSWORDFORM
        }
# Change screen name
	    $r->print(<<ENDSCREENNAMEFORM);
<form name="client" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="changescreenname" />
<input type="submit" 
value="Change nickname and anonymous discussion screen name" />
</form>
ENDSCREENNAMEFORM
	    $r->print(<<ENDMSGFORWARDFORM);
<form name="client" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="changemsgforward" />
<input type="submit" value="Change message forwarding and notification addresses" />
</form>
ENDMSGFORWARDFORM
# The "about me" page
	my $aboutmeaction=
	    '/adm/'.$ENV{'user.domain'}.'/'.$ENV{'user.name'}.'/aboutme';
	$r->print(<<ENDABOUTME);
<form name="client" action="$aboutmeaction" method="post">
<input type="hidden" name="action" value="changescreenname" />
<input type="submit" value="Edit the 'About Me' personal information screen" />
</form>
ENDABOUTME
	    $r->print(<<ENDCOLORFORM);
<form name="client" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="changecolors" />
<input type="submit" value="Change color scheme" />
</form>
ENDCOLORFORM

	    $r->print(<<ENDLANGUAGES);
<form name="client" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="changelanguages" />
<input type="submit" value="Change language preferences" />
</form>
ENDLANGUAGES

	if (($ENV{'user.name'} eq 'albertel' ) ||
            ($ENV{'user.name'} eq 'kortemey' ) ||
            ($ENV{'user.name'} eq 'korte')) {
	    $r->print(<<ENDDEBUG);
<form name="client" action="/adm/preferences" method="post">
<input type="hidden" name="action" value="debugtoggle" />
<input type="submit" value="Toggle Debug" />
Current Debug status is -$ENV{'user.debug'}-.
</form>
ENDDEBUG
	}
	# Other preference setting code should be added here
    }
    $r->print(<<ENDFOOTER);
</body>
</html>
ENDFOOTER
    return OK;
}

1;
__END__