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Diff for /loncom/auth/lonauth.pm between versions 1.84 and 1.169

-version 1.84, 2006/10/06 14:28:45
+version 1.169, 2021/11/03 01:04:02
  Line 1
  # The LearningOnline Network
  # User Authentication Module
  #
  # $Id$
  #
  # 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::lonauth;
  use strict;
- use LONCAPA;
+ use LONCAPA qw(:DEFAULT :match);
  use Apache::Constants qw(:common);
  use CGI qw(:standard);
- use CGI::Cookie();
+ use Apache::loncommon();
- use DynaLoader; # for Crypt::DES version
+ use Apache::lonnet;
- use Crypt::DES;
+ use Apache::lonmenu();
- use Apache::loncommon();
+ use Apache::createaccount;
- use Apache::lonnet;
+ use Apache::ltiauth;
- use Apache::lonmenu();
+ use Fcntl qw(:flock);
- use Fcntl qw(:flock);
+ use Apache::lonlocal;
- use Apache::lonlocal;
+ use Apache::File();
- use GDBM_File;
+ use HTML::Entities;
- my %FORM;
+ use Digest::MD5;
  # ------------------------------------------------------------ Successful login
+ sub success {
- sub success {
+     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
-     my ($r, $username, $domain, $authhost, $lowerurl, $extra_env) = @_;
+ 	$form,$skipcritical,$cid) = @_;
-     my $lonids=$r->dir_config('lonIDsDir');
+ # ------------------------------------------------------------ Get cookie ready
-     my $public=($username eq 'public' && $domain eq 'public');
+     my $cookie =
+ 	&Apache::loncommon::init_user_environment($r, $username, $domain,
- # See if old ID present, if so, remove
+ 						  $authhost, $form,
+ 						  {'extra_env' => $extra_env,});
-     my ($filename,$cookie,$userroles);
-     my $now=time;
+     my $public=($username eq 'public' && $domain eq 'public');
-     if ($public) {
+     if ($public or $lowerurl eq 'noredirect') { return $cookie; }
- 	my $max_public=100;
- 	my $oldest;
+ # -------------------------------------------------------------------- Log this
- 	my $oldest_time=0;
- 	for(my $next=1;$next<=$max_public;$next++) {
+     my $ip = &Apache::lonnet::get_requestor_ip();
- 	    if (-e $lonids."/publicuser_$next.id") {
+     &Apache::lonnet::log($domain,$username,$authhost,
- 		my $mtime=(stat($lonids."/publicuser_$next.id"))[9];
+                          "Login $ip");
- 		if ($mtime<$oldest_time || !$oldest_time) {
- 		    $oldest_time=$mtime;
+ # ------------------------------------------------- Check for critical messages
- 		    $oldest=$next;
- 		}
+     unless ($skipcritical) {
- 	    } else {
+         my @what=&Apache::lonnet::dump('critical',$domain,$username);
- 		$cookie="publicuser_$next";
+         if ($what[0]) {
- 		last;
+ 	    if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
- 	    }
+ 	        $lowerurl='/adm/email?critical=display';
- 	}
+             }
- 	if (!$cookie) { $cookie="publicuser_$oldest"; }
+         }
-     } else {
+     }
- 	opendir(DIR,$lonids);
- 	while ($filename=readdir(DIR)) {
+ # ----------------------------------------------------------- Get cookies ready
- 	    if ($filename=~/^$username\_\d+\_$domain\_$authhost\.id$/) {
+     my ($securecookie,$defaultcookie);
- 		unlink($lonids.'/'.$filename);
+     my $ssl = $r->subprocess_env('https');
- 	    }
+     if ($ssl) {
- 	}
+         $securecookie="lonSID=$cookie; path=/; HttpOnly; secure";
- 	closedir(DIR);
+         my $lonidsdir=$r->dir_config('lonIDsDir');
+         if (($lonidsdir) && (-e "$lonidsdir/$cookie.id")) {
- # Give them a new cookie
+             my $linkname=substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 32).'_linked';
+             if (-e "$lonidsdir/$linkname.id") {
- 	$cookie="$username\_$now\_$domain\_$authhost";
+                 unlink("$lonidsdir/$linkname.id");
+             }
- # Initialize roles
+             my $made_symlink = eval { symlink("$lonidsdir/$cookie.id",
+                                               "$lonidsdir/$linkname.id"); 1 };
- 	$userroles=&Apache::lonnet::rolesinit($domain,$username,$authhost);
+             if ($made_symlink) {
-     }
+                 $defaultcookie = "lonLinkID=$linkname; path=/; HttpOnly;";
- # ------------------------------------ Check browser type and MathML capability
+                 &Apache::lonnet::appenv({'user.linkedenv' => $linkname});
+             }
-     my ($httpbrowser,$clientbrowser,$clientversion,$clientmathml,
+         }
-         $clientunicode,$clientos) = &Apache::loncommon::decode_user_agent($r);
+     } else {
+         $defaultcookie = "lonID=$cookie; path=/; HttpOnly;";
- # -------------------------------------- Any accessibility options to remember?
+     }
-     if (($FORM{'interface'}) && ($FORM{'remember'} eq 'true')) {
+ # -------------------------------------------------------- Menu script and info
- 	foreach ('imagesuppress','appletsuppress',
+     my $destination = $lowerurl;
- 		 'embedsuppress','fontenhance','blackwhite') {
+     if ($env{'request.lti.login'}) {
- 	    if ($FORM{$_} eq 'true') {
+         if (($env{'request.lti.reqcrs'}) && ($env{'request.lti.reqrole'} eq 'cc')) {
- 		&Apache::lonnet::put('environment',{$_ => 'on'},
+             &Apache::loncommon::content_type($r,'text/html');
- 				     $domain,$username);
+             if ($securecookie) {
- 	    } else {
+                 $r->headers_out->add('Set-cookie' => $securecookie);
- 		&Apache::lonnet::del('environment',[$_],$domain,$username);
+             }
- 	    }
+             if ($defaultcookie) {
- 	}
+                 $r->headers_out->add('Set-cookie' => $defaultcookie);
-     }
+             }
- # ------------------------------------------------------------- Get environment
+             $r->send_http_header;
+             if (ref($form) eq 'HASH') {
-     my %userenv=Apache::lonnet::dump('environment',$domain,$username);
+                 $form->{'lti.login'} = $env{'request.lti.login'};
-     my ($tmp) = keys(%userenv);
+                 $form->{'lti.reqcrs'} = $env{'request.lti.reqcrs'};
-     if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
+                 $form->{'lti.reqrole'} = $env{'request.lti.reqrole'};
- 	# default remote control to off
+                 $form->{'lti.sourcecrs'} = $env{'request.lti.sourcecrs'};
- 	if ($userenv{'remote'} ne 'on') { $userenv{'remote'} = 'off'; }
+             }
-     } else {
+             &Apache::ltiauth::lti_reqcrs($r,$domain,$form,$username,$domain);
- 	undef(%userenv);
+             return;
-     }
+         }
-     if (($userenv{'interface'}) && (!$FORM{'interface'})) {
+         if ($env{'request.lti.selfenrollrole'}) {
- 	$FORM{'interface'}=$userenv{'interface'};
+             if (&Apache::ltiauth::lti_enroll($username,$domain,
-     }
+                                              $env{'request.lti.selfenrollrole'}) eq 'ok') {
-     $env{'environment.remote'}=$userenv{'remote'};
+                 $form->{'role'} = $env{'request.lti.selfenrollrole'};
-     if ($userenv{'texengine'} eq 'ttm') { $clientmathml=1; }
+                 &Apache::lonnet::delenv('request.lti.selfenrollrole');
+             } else {
- # --------------- Do not trust query string to be put directly into environment
+                 &Apache::ltiauth::invalid_request($r,24);
-     foreach ('imagesuppress','appletsuppress',
+             }
- 	     'embedsuppress','fontenhance','blackwhite',
+         }
- 	     'interface','localpath','localres') {
+     }
- 	$FORM{$_}=~s/[\n\r\=]//gs;
+     if (defined($form->{role})) {
-     }
+         my $envkey = 'user.role.'.$form->{role};
- # --------------------------------------------------------- Write first profile
+         my $now=time;
+         my $then=$env{'user.login.time'};
-     {
+         my $refresh=$env{'user.refresh.time'};
- 	my %initial_env =
+         my $update=$env{'user.update.time'};
- 	    ("user.name"          => $username,
+         if (!$update) {
- 	     "user.domain"        => $domain,
+             $update = $then;
- 	     "user.home"          => $authhost,
+         }
- 	     "browser.type"       => $clientbrowser,
+         if (exists($env{$envkey})) {
- 	     "browser.version"    => $clientversion,
+             my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
- 	     "browser.mathml"     => $clientmathml,
+             &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
- 	     "browser.unicode"    => $clientunicode,
+                                          \$trolecode,\$tstatus,\$tstart,\$tend);
- 	     "browser.os"         => $clientos,
+             if ($tstatus eq 'is') {
- 	     "server.domain"      => $r->dir_config('lonDefDomain'),
+                 $destination  .= ($destination =~ /\?/) ? '&' : '?';
- 	     "request.course.fn"  => '',
+                 my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
- 	     "request.course.uri" => '',
+                 $destination .= 'selectrole=1&'.$newrole.'=1';
- 	     "request.course.sec" => '',
+             }
- 	     "request.role"       => 'cm',
+         }
- 	     "request.role.adv"   => $env{'user.adv'},
+     }
- 	     "request.host"       => $ENV{'REMOTE_ADDR'},);
+     if (defined($form->{symb})) {
+         my $destsymb = $form->{symb};
-         if ($FORM{'localpath'}) {
+         my $encrypted;
- 	    $initial_env{"browser.localpath"}  = $FORM{'localpath'};
+         if ($destsymb =~ m{^/enc/}) {
- 	    $initial_env{"browser.localres"}   = $FORM{'localres'};
+             $encrypted = 1;
-         }
+             if ($cid) {
+                 $destsymb = &Apache::lonenc::unencrypted($destsymb,$cid);
- 	if ($public) {
+             }
- 	    $initial_env{"environment.remote"} = "off";
+         }
- 	}
+         $destination  .= ($destination =~ /\?/) ? '&' : '?';
- 	if ($FORM{'interface'}) {
+         if ($destsymb =~ /___/) {
- 	    $FORM{'interface'}=~s/\W//gs;
+             my ($map,$resid,$desturl)=split(/___/,$destsymb);
- 	    $initial_env{"browser.interface"} = $FORM{'interface'};
+             $desturl = &Apache::lonnet::clutter($desturl);
- 	    $env{'browser.interface'}=$FORM{'interface'};
+             if ($encrypted) {
- 	    foreach my $option ('imagesuppress','appletsuppress',
+                 $desturl = &Apache::lonenc::encrypted($desturl,1,$cid);
- 				'embedsuppress','fontenhance','blackwhite') {
+                 $destsymb = $form->{symb};
- 		if (($FORM{$option} eq 'true') ||
+             }
- 		    ($userenv{$option} eq 'on')) {
+             $desturl = &HTML::Entities::encode($desturl,'"<>&');
- 		    $initial_env{"browser.$option"} = "on";
+             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
- 		}
+             $destination .= 'destinationurl='.$desturl.
- 	    }
+                             '&destsymb='.$destsymb;
- 	}
+         } elsif (!$encrypted) {
+             $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
- 	$env{'user.environment'} = "$lonids/$cookie.id";
+             $destination .= 'destinationurl='.$destsymb;
+         }
- 	if (tie(my %disk_env,'GDBM_File',"$lonids/$cookie.id",
+     }
- 		 &GDBM_WRCREAT(),0640)) {
+     if ($destination =~ m{^/adm/roles}) {
- 	    &add_to_env(\%disk_env,\%initial_env);
+         $destination  .= ($destination =~ /\?/) ? '&' : '?';
- 	    &add_to_env(\%disk_env,\%userenv,'environment.');
+         $destination .= 'source=login';
- 	    &add_to_env(\%disk_env,$userroles);
+     }
- 	    &add_to_env(\%disk_env,$extra_env);
- 	    untie(%disk_env);
+     if (($env{'request.deeplink.login'} eq $lowerurl) &&
- 	} else {
+         (($env{'request.linkprot'}) || ($env{'request.linkkey'} ne ''))) {
- 	    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
+         my %info;
- 			   'Could not create environment storage in lonauth: '.$!);
+         if ($env{'request.linkprot'}) {
- 	    return 'error: '.$!;
+             $info{'linkprot'} = $env{'request.linkprot'};
- 	}
+         } elsif ($env{'request.linkkey'} ne '') {
-     }
+             $info{'linkkey'} = $env{'request.linkkey'};
-     $env{'request.role'}='cm';
+         }
-     $env{'request.role.adv'}=$env{'user.adv'};
+         $info{'origurl'} = $lowerurl;
-     $env{'browser.type'}=$clientbrowser;
+         my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
- # -------------------------------------------------------------------- Log this
+         unless (($token eq 'con_lost') || ($token eq 'refused') ||
+                 ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
-     &Apache::lonnet::log($domain,$username,$authhost,
+             $destination .= (($destination =~ /\?/) ? '&' : '?') . 'ttoken='.$token;
-                          "Login $ENV{'REMOTE_ADDR'}");
+         }
+     }
- # ------------------------------------------------- Check for critical messages
+     my $windowname = 'loncapaclient';
-     my @what=&Apache::lonnet::dump('critical',$domain,$username);
+     if ($env{'request.lti.login'}) {
-     if ($what[0]) {
+         $windowname .= 'lti';
- 	if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
+     }
- 	    $lowerurl='/adm/email?critical=display';
+     my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="'.$windowname.'";');
-         }
+     my $brcrum = [{'href' => '',
-     }
+                    'text' => 'Successful Login'},];
+     my $args = {'bread_crumbs' => $brcrum,};
- # ------------------------------------------------------------ Get cookie ready
+     unless ((defined($form->{role})) || (defined($form->{symb}))) {
+         my $update=$env{'user.update.time'};
-     if ($public or $lowerurl eq 'noredirect') { return $cookie; }
+         if (!$update) {
+             $update = $env{'user.login.time'};
-     $cookie="lonID=$cookie; path=/";
+         }
- # -------------------------------------------------------- Menu script and info
+         my %roles_in_env;
-     my $windowinfo=&Apache::lonmenu::open($clientos);
+         my $showcount = &Apache::lonroles::roles_from_env(\%roles_in_env,$update);
-     my $startupremote=&Apache::lonmenu::startupremote($lowerurl);
+         if ($showcount == 1) {
-     my $remoteinfo=&Apache::lonmenu::load_remote_msg($lowerurl);
+             foreach my $rolecode (keys(%roles_in_env)) {
-     my $setflags=&Apache::lonmenu::setflags();
+                 my ($cid) = ($rolecode =~ m{^\Quser.role.st./\E($match_domain/$match_courseid)(?:/|$)});
-     my $maincall=&Apache::lonmenu::maincall();
+                 if ($cid) {
-     my $start_page=&Apache::loncommon::start_page('Successful Login',
+                     my %coursedescription =
- 						  $startupremote,
+                         &Apache::lonnet::coursedescription($cid,{'one_time' => '1'});
- 						  {'no_inline_link' => 1,});
+                     if ($coursedescription{'type'} eq 'Placement') {
-     my $end_page  =&Apache::loncommon::end_page();
+                         $args->{'crstype'} = 'Placement';
+                     }
-     my $continuelink;
+                     last;
-     if (($env{'browser.interface'} eq 'textual') ||
+                 }
-         ($env{'environment.remote'} eq 'off')) {
+             }
- 	$continuelink="<a href=\"$lowerurl\">".&mt('Continue')."</a>";
+         }
      }
- # ------------------------------------------------- Output for successful login
+ # ------------------------------------------------- Output for successful login
-     &Apache::loncommon::content_type($r,'text/html');
-     $r->header_out('Set-cookie' => $cookie);
+     &Apache::loncommon::content_type($r,'text/html');
-     $r->send_http_header;
+     if ($securecookie) {
+         $r->headers_out->add('Set-cookie' => $securecookie);
-     my %lt=&Apache::lonlocal::texthash(
+     }
- 				       'wel' => 'Welcome',
+     if ($defaultcookie) {
- 				       'mes' => 'Welcome to the Learning<i>Online</i> Network with CAPA. Please wait while your session is being set up',
+         $r->headers_out->add('Set-cookie' => $defaultcookie);
- 				       'pro' => 'Problems',
+     }
- 				       'log' => 'loginproblems.html',
+     $r->send_http_header;
- 				       );
-     $r->print(<<ENDSUCCESS);
+     my ($start_page,$js,$pagebody,$end_page);
- $start_page
+     if ($env{'request.lti.login'}) {
- $setflags
+         $args = {'only_body' => 1};
- $windowinfo
+         if ($env{'request.lti.target'} eq '') {
- <h1>$lt{'wel'}</h1>
+             my $ltitarget = (($destination =~ /\?/) ? '&' : '?').
- $lt{'mes'}.<p>
+                             'ltitarget=iframe';
- <a href="/adm/$lt{'log'}">$lt{'pro'}?</a></p>
+             $js = <<"ENDJS";
- $remoteinfo
- $maincall
+ <script type="text/javascript">
- $continuelink
+ // <![CDATA[
- $end_page
+ function setLTItarget() {
- ENDSUCCESS
+     var newloc = '$destination';
- }
+     if (parent !== window) {
+         newloc += '$ltitarget';
- sub add_to_env {
+     }
-     my ($idf,$env_data,$prefix) = @_;
+     window.location.href=newloc;
-     while (my ($key,$value) = each(%$env_data)) {
+ }
- 	$idf->{$prefix.$key} = $value;
+ // ]]>
- 	$env{$prefix.$key}   = $value;
+ </script>
-     }
- }
+ ENDJS
+             $args->{'add_entries'} = {'onload' => "javascript:setLTItarget();"};
- # --------------------------------------------------------------- Failed login!
+             $pagebody =  '<noscript><span class="LC_warning">'
+                         .&mt('Use of LON-CAPA requires Javascript to be enabled in your web browser.')
- sub failed {
+                         .'</span></noscript>';
-     my ($r,$message) = @_;
+         } else {
-     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,
+             $args->{'redirect'} = [0,$destination,1];
- 						    {'no_inline_link' => 1,});
+         }
-     my $end_page   = &Apache::loncommon::end_page();
+         $start_page=&Apache::loncommon::start_page('',$js,$args);
+     } else {
-     my %lt=('sorry'  => &mt('Sorry ...'),
+         $args->{'redirect'} = [0,$destination];
- 	    'please' =>
+         $start_page=&Apache::loncommon::start_page('Successful Login',
- 	    &mt('Please [_1]log in again[_2].',
+                                                    $js,$args);
- 		"<a href=\"/adm/login?username=$FORM{'uname'}&domain=$FORM{'udom'}\">",
- 		'</a>'),
+         my %lt=&Apache::lonlocal::texthash(
- 	    'problemspage' => &mt('loginproblems.html'),
+ 				           'wel' => 'Welcome',
- 	    'problems'     => 'Problems',
+ 				           'pro' => 'Login problems?',
- 	    );
+ 				          );
-     &Apache::loncommon::content_type($r,'text/html');
+         $pagebody = "<h1>$lt{'wel'}</h1>\n".
-     $r->send_http_header;
+                     &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>');
+         my $loginhelp = &loginhelpdisplay($domain);
-     $r->print(<<ENDFAILED);
+         if ($loginhelp) {
- $start_page
+             $pagebody .= '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>';
- <h1>$lt{'sorry'}</h1>
+         }
- <p><b>$message</b></p>
+     }
- <p>$lt{'please'}</p>
+     $end_page = &Apache::loncommon::end_page();
- <p>
+     $r->print(<<ENDSUCCESS);
- <a href="/adm/$lt{'problemspage'}">$lt{'problems'}</a></p>
+ $start_page
- $end_page
+ $windowinfo
- ENDFAILED
+ $pagebody
- }
+ $end_page
+ ENDSUCCESS
- # ------------------------------------------------------------------ Rerouting!
+     return;
+ }
- sub reroute {
-     my ($r) = @_;
+ # --------------------------------------------------------------- Failed login!
-     &Apache::loncommon::content_type($r,'text/html');
-     $r->send_http_header;
+ sub failed {
-     my $msg='<h1>Sorry ...</h1>
+     my ($r,$message,$form) = @_;
-              Please <a href="/">log in again</a>.';
+     (undef,undef,undef,my $clientmathml,my $clientunicode) =
-     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg);
+         &Apache::loncommon::decode_user_agent();
- }
+     my $args = {};
+     if ($clientunicode && !$clientmathml) {
- # ---------------------------------------------------------------- Main handler
+         $args = {'browser.unicode' => 1};
+     }
- sub handler {
-     my $r = shift;
+     my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
+     my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
- # Are we re-routing?
+     my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
-     if (-e '/home/httpd/html/lon-status/reroute.txt') {
+     if (&Apache::lonnet::domain($udom,'description') eq '') {
- 	&reroute($r);
+         undef($udom);
- 	return OK;
+     }
-     }
+     my $retry = '/adm/login';
+     if ($uname eq $form->{'uname'}) {
-     &Apache::lonlocal::get_language_handle($r);
+         $retry .= '?username='.$uname;
+     }
- # -------------------------------- Prevent users from attempting to login twice
+     if ($udom) {
-     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
+         $retry .= (($retry=~/\?/)?'&amp;':'?').'domain='.$udom;
-     my $lonid=$cookies{'lonID'};
+     }
-     my $cookie;
+     my $lonhost = $r->dir_config('lonHostID');
-     if ($lonid) {
+     my $querystr;
- 	my $handle=$lonid->value;
+     my $result = &set_retry_token($form,$lonhost,\$querystr);
-         $handle=~s/\W//g;
+     if ($result eq 'fail') {
-         my $lonidsdir=$r->dir_config('lonIDsDir');
+         if (exists($form->{role})) {
-         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
+             my $role = &Apache::loncommon::cleanup_html($form->{role});
- # Indeed, a valid token is found
+             if ($role ne '') {
- 	    &Apache::loncommon::content_type($r,'text/html');
+                 $retry .= (($retry=~/\?/)?'&amp;':'?').'role='.$role;
- 	    $r->send_http_header;
+             }
- 	    my $start_page =
+         }
- 		&Apache::loncommon::start_page('Already logged in');
+         if (exists($form->{symb})) {
- 	    my $end_page =
+             my $symb = &Apache::loncommon::cleanup_html($form->{symb});
- 		&Apache::loncommon::end_page();
+             if ($symb ne '') {
- 	    $r->print(<<ENDFAILED);
+                 $retry .= (($retry=~/\?/)?'&amp;':'?').'symb='.$symb;
- $start_page
+             }
- <h1>You are already logged in</h1>
+         }
- <p>Please either <a href="/adm/roles">continue the current session</a> or
+         if (exists($form->{firsturl})) {
- <a href="/adm/logout">logout</a>.</p>
+             my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
- <p>
+             if ($firsturl ne '') {
- <a href="/adm/loginproblems.html">Problems?</a></p>
+                 $retry .= (($retry=~/\?/)?'&amp;':'?').'firsturl='.$firsturl;
- $end_page
+                 if ($form->{firsturl} =~ m{^/tiny/$match_domain/\w+$}) {
- ENDFAILED
+                     unless (exists($form->{linkprot})) {
-            return OK;
+                         if (exists($form->{linkkey})) {
- 	}
+                             $retry .= 'linkkey='.$form->{linkkey};
-     }
+                         }
+                     }
- # ---------------------------------------------------- No valid token, continue
+                 }
+             }
+         }
-     my $buffer;
+         if (exists($form->{linkprot})) {
-     if ($r->header_in('Content-length') > 0) {
+             my $ltoken = &Apache::lonnet::tmpput({linkprot => $form->{'linkprot'}},
- 	$r->read($buffer,$r->header_in('Content-length'),0);
+                                                  $r->dir_config('lonHostID'),'retry');
-     }
+             if ($ltoken) {
-     my @pairs=split(/&/,$buffer);
+                 $retry .= (($retry =~ /\?/) ? '&' : '?').'ltoken='.$ltoken;
-     my $pair; my $name; my $value;
+             }
-     undef %FORM;
+         }
-     %FORM=();
+     } elsif ($querystr ne '') {
-     foreach $pair (@pairs) {
+         $retry .= (($retry=~/\?/)?'&amp;':'?').$querystr;
-        ($name,$value) = split(/=/,$pair);
+     }
-        $value =~ tr/+/ /;
+     my $end_page = &Apache::loncommon::end_page();
-        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
+     &Apache::loncommon::content_type($r,'text/html');
-        $FORM{$name}=$value;
+     $r->send_http_header;
-     }
+     my @actions =
+          (&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>'));
-     if ((!$FORM{'uname'}) || (!$FORM{'upass0'}) || (!$FORM{'udom'})) {
+     my $loginhelp = &loginhelpdisplay($udom);
- 	failed($r,'Username, password and domain need to be specified.');
+     if ($loginhelp) {
-         return OK;
+         push(@actions, '<a href="'.$loginhelp.'">'.&mt('Login problems?').'</a>');
      }
+     #FIXME: link to helpdesk might be added here
- # split user logging in and "su"-user
+     $r->print(
-     ($FORM{'uname'},$FORM{'suname'})=split(/\:/,$FORM{'uname'});
+        $start_page
-     $FORM{'uname'} =~ s/\W//g;
+       .'<h2>'.&mt('Sorry ...').'</h2>'
-     $FORM{'suname'} =~ s/\W//g;
+       .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'<br /><br />'
-     $FORM{'udom'}  =~ s/\W//g;
+       .&Apache::lonhtmlcommon::actionbox(\@actions)
+       .$end_page
-     my $role   = $r->dir_config('lonRole');
+     );
-     my $domain = $r->dir_config('lonDefDomain');
+  }
-     my $prodir = $r->dir_config('lonUsersDir');
+ # ------------------------------------------------------------------ Rerouting!
- # ---------------------------------------- Get the information from login token
+ sub reroute {
-     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$FORM{'logtoken'},
+     my ($r) = @_;
-                                       $FORM{'serverid'});
+     &Apache::loncommon::content_type($r,'text/html');
+     $r->send_http_header;
-     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost')) {
+     my $msg='<b>'.&mt('Sorry ...').'</b><br />'
- 	failed($r,'Information needed to verify your login information is missing, inaccessible or expired.');
+            .&mt('Please [_1]log in again[_2].');
-         return OK;
+     &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
-     } else {
+ }
- 	my $reply = &Apache::lonnet::reply('tmpdel:'.$FORM{'logtoken'},
- 					   $FORM{'serverid'});
+ # ---------------------------------------------------------------- Main handler
-         if ( $reply ne 'ok' ) {
-             &failed($r,'Session could not be opened.');
+ sub handler {
- 	    &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $FORM{'serverid'}." to get login token");
+     my $r = shift;
- 	    return OK;
+     my $londocroot = $r->dir_config('lonDocRoot');
- 	}
+ # Are we re-routing?
-     }
+     if (-e "$londocroot/lon-status/reroute.txt") {
-     my ($key,$firsturl)=split(/&/,$tmpinfo);
+ 	&reroute($r);
+ 	return OK;
-     my $keybin=pack("H16",$key);
+     }
-     my $cipher;
+     &Apache::lonlocal::get_language_handle($r);
-     if ($Crypt::DES::VERSION>=2.03) {
- 	$cipher=new Crypt::DES $keybin;
+ # -------------------------------- Prevent users from attempting to login twice
-     }
+     my $handle = &Apache::lonnet::check_for_valid_session($r);
-     else {
+     if ($handle ne '') {
- 	$cipher=new DES $keybin;
+         my $lonidsdir=$r->dir_config('lonIDsDir');
-     }
+         if ($handle=~/^publicuser\_/) {
-     my $upass='';
+ # For "public user" - remove it, we apparently really want to login
-     for (my $i=0;$i<=2;$i++) {
+             unlink($r->dir_config('lonIDsDir')."/$handle.id");
- 	my $chunk=
+         } else {
- 	    $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},0,16))));
+ # Indeed, a valid token is found
+             &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
- 	$chunk.=
+ 	    &Apache::loncommon::content_type($r,'text/html');
- 	    $cipher->decrypt(unpack("a8",pack("H16",substr($FORM{'upass'.$i},16,16))));
+ 	    $r->send_http_header;
+ 	    my $start_page =
- 	$chunk=substr($chunk,1,ord(substr($chunk,0,1)));
+ 	        &Apache::loncommon::start_page('Already logged in');
- 	$upass.=$chunk;
+ 	    my $end_page =
-     }
+ 	        &Apache::loncommon::end_page();
+             my $dest = '/adm/roles';
- # ---------------------------------------------------------------- Authenticate
+             my %form = &get_form_items($r);
-     my $authhost=Apache::lonnet::authenticate($FORM{'uname'},
+             if ($form{'logtoken'}) {
-                                               $upass,
+                 my $tmpinfo = &Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
-                                               $FORM{'udom'});
+                                                      $form{'serverid'});
+                 unless (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
- # --------------------------------------------------------------------- Failed?
+                         ($tmpinfo eq 'no_such_host')) {
+                     my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
-     if ($authhost eq 'no_host') {
+                     $firsturl = &unescape($firsturl);
- 	failed($r,'Username and/or password could not be authenticated.');
+                     my %info;
-         return OK;
+                     foreach my $item (@rest) {
-     }
+                         my ($key,$value) = split(/=/,$item);
+                         $info{$key} = &unescape($value);
-     if (($firsturl eq '') ||
+                     }
- 	($firsturl=~/^\/adm\/(logout|remote)/)) {
+                     if ($firsturl ne '') {
- 	$firsturl='/adm/roles';
+                         $info{'firsturl'} = $firsturl;
-     }
+                         $dest = $firsturl;
- # --------------------------------- Are we attempting to login as somebody else?
+                         my $relogin;
-     if ($FORM{'suname'}) {
+                         if ($dest =~ m{^/tiny/$match_domain/\w+$}) {
- # ------------ see if the original user has enough privileges to pull this stunt
+                             if ($env{'request.course.id'}) {
- 	if (&Apache::lonnet::privileged($FORM{'uname'},$FORM{'udom'})) {
+                                 my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
- # ---------------------------------------------------- see if the su-user exists
+                                 my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
- 	    unless (&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'})
+                                 my $symb = &Apache::loncommon::symb_from_tinyurl($dest,$cnum,$cdom);
- 		eq 'no_host') {
+                                 if ($symb) {
- 		&Apache::lonnet::logthis(&Apache::lonnet::homeserver($FORM{'suname'},$FORM{'udom'}));
+                                     unless (&set_deeplink_login(%info) eq 'ok') {
- # ------------------------------ see if the su-user is not too highly privileged
+                                         $relogin = 1;
- 		unless (&Apache::lonnet::privileged($FORM{'suname'},$FORM{'udom'})) {
+                                     }
- # -------------------------------------------------------- actually switch users
+                                 }
- 		    &Apache::lonnet::logperm('User '.$FORM{'uname'}.' at '.$FORM{'udom'}.
+                             }
- 			' logging in as '.$FORM{'suname'});
+                             if ($relogin) {
- 		    $FORM{'uname'}=$FORM{'suname'};
+                                 $r->print(
- 		} else {
+                                       $start_page
- 		    &Apache::lonnet::logthis('Attempted switch user to privileged user');
+                                      .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
- 		}
+                                      .'<p>'.&mt('Please [_1]log out[_2] first, and then try your access again',
- 	    }
+                                                 '<a href="/adm/logout">','</a>')
- 	} else {
+                                      .'</p>'
- 	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
+                                      .$end_page);
- 	}
+                             } else {
-     }
+                                 if (($info{'linkprot'}) || ($info{'linkkey'} ne '')) {
-     if ($r->dir_config("lonBalancer") eq 'yes') {
+                                     my $token = &Apache::lonnet::tmpput(\%info,$r->dir_config('lonHostID'),'link');
- 	&success($r,$FORM{'uname'},$FORM{'udom'},$authhost,'noredirect');
+                                     unless (($token eq 'con_lost') || ($token eq 'refused') ||
- 	$r->internal_redirect('/adm/switchserver');
+                                             ($token eq 'unknown_cmd') || ($token eq 'no_such_host')) {
-     } else {
+                                         $dest .= (($dest =~ /\?/) ? '&' : '?') . 'ttoken='.$token;
- 	&success($r,$FORM{'uname'},$FORM{'udom'},$authhost,$firsturl);
+                                     }
-     }
+                                 }
-     return OK;
+                                 $r->print(
- }
+                                       $start_page
+                                      .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
-;
+                                      .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4] first, and then try your access again',
- __END__
+                                                 '<a href="'.$dest.'">','</a>',
+                                                 '<a href="/adm/logout">','</a>')
+                                      .'</p>'
+                                      .$end_page);
+                             }
+                             return OK;
+                         }
+                     }
+                 }
+             }
+             $r->print(
+                   $start_page
+                  .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>'
+                  .'<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
+     my %form = &get_form_items($r);
+     if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
+ 	&failed($r,'Username, password and domain need to be specified.',
+ 		\%form);
+         return OK;
+     }
+ # split user logging in and "su"-user
+     ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
+     $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
+     $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
+     $form{'udom'}  = &LONCAPA::clean_domain($form{'udom'});
+     $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
+     my $role   = $r->dir_config('lonRole');
+     my $domain = $r->dir_config('lonDefDomain');
+     my $prodir = $r->dir_config('lonUsersDir');
+     my $contact_name = &mt('LON-CAPA helpdesk');
+ # ---------------------------------------- Get the information from login token
+     my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
+                                       $form{'serverid'});
+     if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
+         ($tmpinfo eq 'no_such_host')) {
+ 	&failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
+         return OK;
+     } else {
+ 	my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
+ 					   $form{'serverid'});
+         if ( $reply ne 'ok' ) {
+             &failed($r,'Session could not be opened.',\%form);
+ 	    &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
+ 	    return OK;
+ 	}
+     }
+     if (!&Apache::lonnet::domain($form{'udom'})) {
+         &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
+         return OK;
+     }
+     my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
+     $firsturl = &unescape($firsturl);
+     foreach my $item (@rest) {
+         my ($key,$value) = split(/=/,$item);
+         $form{$key} = &unescape($value);
+     }
+     if ($firsturl =~ m{^/tiny/$match_domain/\w+$}) {
+         $form{'firsturl'} = $firsturl;
+     }
+     my $upass = $ENV{HTTPS} ? $form{'upass0'}
+         : &Apache::loncommon::des_decrypt($des_key,$form{'upass0'});
+ # ---------------------------------------------------------------- Authenticate
+     my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
+     my ($cancreate,$statustocreate) =
+         &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
+     my $defaultauth;
+     if (ref($cancreate) eq 'ARRAY') {
+         if (grep(/^login$/,@{$cancreate})) {
+             $defaultauth = 1;
+         }
+     }
+     my $clientcancheckhost = 1;
+     my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
+                                               $form{'udom'},$defaultauth,
+                                               $clientcancheckhost);
+ # --------------------------------------------------------------------- Failed?
+     if ($authhost eq 'no_host') {
+ 	&failed($r,'Username and/or password could not be authenticated.',
+ 		\%form);
+         return OK;
+     } elsif ($authhost eq 'no_account_on_host') {
+         if ($defaultauth) {
+             my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
+             unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
+                 return OK;
+             }
+             my $start_page =
+                 &Apache::loncommon::start_page('Create a user account in LON-CAPA',
+                                                '',{'no_inline_link'   => 1,});
+             my $lonhost = $r->dir_config('lonHostID');
+             my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
+             my $contacts =
+                 &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
+                                                         $form{'udom'},$origmail);
+             my ($contact_email) = split(',',$contacts);
+             my $output =
+                 &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
+                                                        $domdesc,'',$lonhost,
+                                                        $contact_email,$contact_name,
+                                                        undef,$statustocreate);
+             &Apache::loncommon::content_type($r,'text/html');
+             $r->send_http_header;
+             &Apache::createaccount::print_header($r,$start_page);
+             $r->print('<h3>'.&mt('Account creation').'</h3>'.
+                       &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'.
+                       $output.&Apache::loncommon::end_page());
+             return OK;
+         } else {
+             &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form);
+             return OK;
+         }
+     }
+     if (($firsturl eq '') ||
+ 	($firsturl=~/^\/adm\/(logout|remote)/)) {
+ 	$firsturl='/adm/roles';
+     }
+     my ($hosthere,%sessiondata);
+     if ($form{'iptoken'}) {
+         %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
+         my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
+         if (($sessiondata{'domain'} eq $form{'udom'}) &&
+             ($sessiondata{'username'} eq $form{'uname'})) {
+             $hosthere = 1;
+         }
+     }
+ # --------------------------------- Are we attempting to login as somebody else?
+     if ($form{'suname'}) {
+         my ($suname,$sudom,$sudomref);
+         $suname = $form{'suname'};
+         $sudom = $form{'udom'};
+         if ($form{'sudom'}) {
+             unless ($sudom eq $form{'sudom'}) {
+                 if (&Apache::lonnet::domain($form{'sudom'})) {
+                     $sudomref = [$form{'sudom'}];
+                     $sudom = $form{'sudom'};
+                 }
+             }
+         }
+ # ------------ see if the original user has enough privileges to pull this stunt
+ 	if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
+ # ---------------------------------------------------- see if the su-user exists
+ 	    unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
+ # ------------------------------ see if the su-user is not too highly privileged
+ 		if (&Apache::lonnet::privileged($suname,$sudom)) {
+                     &Apache::lonnet::logthis('Attempted switch user to privileged user');
+                 } else {
+                     my $noprivswitch;
+ #
+ # su-user's home server and user's home server must have one of:
+ # (a) same domain
+ # (b) same primary library server for the two domains
+ # (c) same "internet domain" for primary library server(s) for home servers' domains
+ #
+                     my $suprim = &Apache::lonnet::domain($sudom,'primary');
+                     my $suintdom = &Apache::lonnet::internet_dom($suprim);
+                     unless ($sudom eq $form{'udom'}) {
+                         my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
+                         my $uintdom = &Apache::lonnet::internet_dom($uprim);
+                         unless ($suprim eq $uprim) {
+                             unless ($suintdom eq $uintdom) {
+                                 &Apache::lonnet::logthis('Attempted switch user '
+                                    .'to user with different "internet domain".');
+                                 $noprivswitch = 1;
+                             }
+                         }
+                     }
+                     unless ($noprivswitch) {
+ #
+ # server where log-in occurs must have same "internet domain" as su-user's home
+ # server
+ #
+                         my $lonhost = $r->dir_config('lonHostID');
+                         my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
+                         if ($hostintdom ne $suintdom) {
+                             &Apache::lonnet::logthis('Attempted switch user on a '
+                                 .'server with a different "internet domain".');
+                         } else {
+ # -------------------------------------------------------- actually switch users
+ 		            &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
+                               $form{'udom'}.' logging in as '.$suname.':'.$sudom);
+ 		            $form{'uname'}=$suname;
+                             if ($form{'udom'} ne $sudom) {
+                                 $form{'udom'}=$sudom;
+                             }
+                         }
+                     }
+ 		}
+ 	    }
+ 	} else {
+ 	    &Apache::lonnet::logthis('Non-privileged user attempting switch user');
+ 	}
+     }
+     my ($is_balancer,$otherserver);
+     unless ($hosthere) {
+         ($is_balancer,$otherserver) =
+             &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
+         if ($is_balancer) {
+             # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
+             my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
+             if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
+                 $otherserver = $found_server;
+             }
+             if ($otherserver eq '') {
+                 my $lowest_load;
+                 ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
+                 if ($lowest_load > 100) {
+                     $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$form{'udom'});
+                 }
+             }
+             if ($otherserver ne '') {
+                 my @hosts = &Apache::lonnet::current_machine_ids();
+                 if (grep(/^\Q$otherserver\E$/,@hosts)) {
+                     $hosthere = $otherserver;
+                 }
+             }
+         }
+     }
+     if (($is_balancer) && (!$hosthere)) {
+         if ($otherserver) {
+             &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
+                      \%form);
+             my $switchto = '/adm/switchserver?otherserver='.$otherserver;
+             if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
+                 $switchto .= '&origurl='.$firsturl;
+             }
+             if ($form{'role'}) {
+                 $switchto .= '&role='.$form{'role'};
+             }
+             if ($form{'symb'}) {
+                 $switchto .= '&symb='.$form{'symb'};
+             }
+             if ($form{'linkprot'}) {
+                 $env{'request.linkprot'} = $form{'linkprot'};
+             } elsif ($form{'linkkey'} ne '') {
+                 $env{'request.linkkey'} = $form{'linkkey'};
+             }
+             if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+                 &set_deeplink_login(%form);
+             }
+             $r->internal_redirect($switchto);
+         } else {
+             &Apache::loncommon::content_type($r,'text/html');
+             $r->send_http_header;
+             $r->print(&noswitch());
+         }
+         return OK;
+     } else {
+         if (!&check_can_host($r,\%form,$authhost)) {
+             my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
+             if ($otherserver) {
+                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
+                          \%form);
+                 my $switchto = '/adm/switchserver?otherserver='.$otherserver;
+                 if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
+                     $switchto .= '&origurl='.$firsturl;
+                 }
+                 if ($form{'role'}) {
+                     $switchto .= '&role='.$form{'role'};
+                 }
+                 if ($form{'symb'}) {
+                     $switchto .= '&symb='.$form{'symb'};
+                 }
+                 if ($form{'linkprot'}) {
+                     $env{'request.linkprot'} = $form{'linkprot'};
+                 } elsif ($form{'linkkey'} ne '') {
+                     $env{'request.linkkey'} = $form{'linkkey'};
+                 }
+                 if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+                     &set_deeplink_login(%form);
+                 }
+                 $r->internal_redirect($switchto);
+             } else {
+                 &Apache::loncommon::content_type($r,'text/html');
+                 $r->send_http_header;
+                 $r->print(&noswitch());
+             }
+             return OK;
+         }
+ # ------------------------------------------------------- Do the load balancing
+ # ---------------------------------------------------------- Determine own load
+         my $loadlim = $r->dir_config('lonLoadLim');
+         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();
+ # ---------------------------------------------------------- Are we overloaded?
+         if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
+             my $unloaded=Apache::lonnet::spareserver($r,$loadpercent,$userloadpercent,1,$form{'udom'});
+             if (!$unloaded) {
+                 ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
+             }
+             if ($unloaded) {
+                 &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
+                          undef,\%form);
+                 if ($form{'linkprot'}) {
+                     $env{'request.linkprot'} = $form{'linkprot'};
+                 } elsif ($form{'linkkey'} ne '') {
+                     $env{'request.linkkey'} = $form{'linkkey'};
+                 }
+                 if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+                     &set_deeplink_login(%form);
+                 }
+                 $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
+                 return OK;
+             }
+         }
+         if (($is_balancer) && ($hosthere)) {
+             $form{'noloadbalance'} = $hosthere;
+         }
+         my $extra_env;
+         if (($hosthere) && ($sessiondata{'sessionserver'} ne '')) {
+             if ($sessiondata{'origurl'} ne '') {
+                 $firsturl = $sessiondata{'origurl'};
+                 $form{'firsturl'} = $sessiondata{'origurl'};
+                 my @names = ('role','symb','linkprot','linkkey');
+                 foreach my $item (@names) {
+                     if ($sessiondata{$item} ne '') {
+                         $form{$item} = $sessiondata{$item};
+                     }
+                 }
+             }
+         }
+         if ($form{'linkprot'}) {
+             my ($linkprotector,$uri) = split(/:/,$form{'linkprot'},2);
+             if ($linkprotector) {
+                 $extra_env = {'user.linkprotector' => $linkprotector,
+                               'user.linkproturi'   => $uri};
+             }
+         } elsif ($form{'linkkey'} ne '') {
+             $extra_env = {'user.deeplinkkey'  => $form{'linkkey'},
+                           'user.keyedlinkuri' => $form{'firsturl'}};
+         }
+         if ($form{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+             &set_deeplink_login(%form);
+             if ($form{'linkprot'}) {
+                 if (ref($extra_env) eq 'HASH') {
+                     %{$extra_env} = ( %{$extra_env}, 'request.linkprot' => $form{'linkprot'} );
+                 } else {
+                     $extra_env = {'request.linkprot' => $form{'linkprot'}};
+                 }
+             } elsif ($form{'linkkey'} ne '') {
+                 if (ref($extra_env) eq 'HASH') {
+                     %{$extra_env} = ( %{$extra_env}, 'request.linkkey' => $form{'linkkey'} );
+                 } else {
+                     $extra_env = {'request.linkkey' => $form{'linkkey'}};
+                 }
+             }
+             if ($env{'request.deeplink.login'}) {
+                 if (ref($extra_env) eq 'HASH') {
+                     %{$extra_env} = ( %{$extra_env}, 'request.deeplink.login' => $form{'firsturl'} );
+                 } else {
+                     $extra_env = {'request.deeplink.login' => $form{'firsturl'}};
+                 }
+             }
+         }
+         &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,$extra_env,
+                  \%form);
+         return OK;
+     }
+ }
+ sub get_form_items {
+     my ($r) = @_;
+     my $buffer;
+     if ($r->header_in('Content-length') > 0) {
+         $r->read($buffer,$r->header_in('Content-length'),0);
+     }
+     my %form;
+     foreach my $pair (split(/&/,$buffer)) {
+        my ($name,$value) = split(/=/,$pair);
+        $value =~ tr/+/ /;
+        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
+        $form{$name}=$value;
+     }
+     return %form;
+ }
+ sub set_deeplink_login {
+     my (%form) = @_;
+     my $disallow;
+     if ($form{'firsturl'} =~ m{^/tiny/($match_domain)/\w+$}) {
+         my $cdom = $1;
+         my ($cnum,$symb) = &Apache::loncommon::symb_from_tinyurl($form{'firsturl'},'',$cdom);
+         if ($symb) {
+             if ($env{'request.course.id'} eq $cdom.'_'.$cnum) {
+                 my $deeplink;
+                 if ($symb =~ /\.(page|sequence)$/) {
+                     my $mapname = &Apache::lonnet::deversion((&Apache::lonnet::decode_symb($symb))[2]);
+                     my $navmap = Apache::lonnavmaps::navmap->new();
+                     if (ref($navmap)) {
+                         $deeplink = $navmap->get_mapparam(undef,$mapname,'0.deeplink');
+                     }
+                 } else {
+                     $deeplink = &Apache::lonnet::EXT('resource.0.deeplink',$symb);
+                 }
+                 if ($deeplink ne '') {
+                     my ($state,$others,$listed,$scope,$protect) = split(/,/,$deeplink);
+                     if (($protect ne 'none') && ($protect ne '')) {
+                         my ($acctype,$item) = split(/:/,$protect);
+                         if ($acctype =~ /lti(c|d)$/) {
+                             unless ($form{'linkprot'} eq $item.$1.':'.$env{'request.deeplink.login'}) {
+                                 $disallow = 1;
+                             }
+                         } elsif ($acctype eq 'key') {
+                             unless ($form{'linkkey'} eq $item) {
+                                 $disallow = 1;
+                             }
+                         }
+                     }
+                 }
+                 unless ($disallow) {
+                     $env{'request.deeplink.login'} = $form{'firsturl'};
+                 }
+             } else {
+                 $env{'request.deeplink.login'} = $form{'firsturl'};
+             }
+         }
+     }
+     if ($disallow) {
+         return;
+     }
+     return 'ok';
+ }
+ sub set_retry_token {
+     my ($form,$lonhost,$querystr) = @_;
+     if (ref($form) eq 'HASH') {
+         my ($firsturl,$token,$extras,@names);
+         @names = ('role','symb','linkprot','linkkey','iptoken');
+         foreach my $name (@names) {
+             if ($form->{$name} ne '') {
+                 $extras .= '&'.$name.'='.&escape($form->{$name});
+                 last if ($name eq 'linkprot');
+             }
+         }
+         my $firsturl = $form->{'firsturl'};
+         if (($firsturl ne '') || ($extras ne '')) {
+             $extras .= ':retry';
+             $token = &Apache::lonnet::reply('tmpput:'.&escape($firsturl).
+                                             $extras,$lonhost);
+             if (($token eq 'con_lost') || ($token eq 'no_such_host')) {
+                 return 'fail';
+             } else {
+                 if (ref($querystr)) {
+                     $$querystr = 'retry='.$token;
+                 }
+                 return 'ok';
+             }
+         }
+     }
+     return;
+ }
+ sub check_can_host {
+     my ($r,$form,$authhost,$domdesc) = @_;
+     return unless (ref($form) eq 'HASH');
+     my $canhost = 1;
+     my $lonhost = $r->dir_config('lonHostID');
+     my $udom = $form->{'udom'};
+     my @intdoms;
+     my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
+     if (ref($internet_names) eq 'ARRAY') {
+         @intdoms = @{$internet_names};
+     }
+     my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+     my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+     unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
+         my $machine_dom = &Apache::lonnet::host_domain($lonhost);
+         my $hostname = &Apache::lonnet::hostname($lonhost);
+         my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
+         my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
+         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
+         my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
+         my $loncaparev;
+         if ($authhost eq 'no_account_on_host') {
+             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
+         } else {
+             $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
+         }
+         $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
+                                                      $udomdefaults{'remotesessions'},
+                                                      $defdomdefaults{'hostedsessions'});
+     }
+     unless ($canhost) {
+         if ($authhost eq 'no_account_on_host') {
+             my $checkloginvia = 1;
+             my ($login_host,$hostname) =
+                 &Apache::lonnet::choose_server($udom,$checkloginvia);
+             &Apache::loncommon::content_type($r,'text/html');
+             $r->send_http_header;
+             if ($login_host ne '') {
+                 my $protocol = $Apache::lonnet::protocol{$login_host};
+                 $protocol = 'http' if ($protocol ne 'https');
+                 my $alias = &Apache::lonnet::use_proxy_alias($r,$login_host);
+                 $hostname = $alias if ($alias ne '');
+                 my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
+ #FIXME Should preserve where user was going and linkprot by setting ltoken at $login_host
+                 $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
+                           '<h3>'.&mt('Account creation').'</h3>'.
+                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
+                           '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'.
+                           '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>').
+                           &Apache::loncommon::end_page());
+             } else {
+                 $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
+                           '<h3>'.&mt('Account creation unavailable').'</h3>'.
+                           &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'.
+                           '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'.
+                           &Apache::loncommon::end_page());
+             }
+         } else {
+             &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
+                      $form);
+             if ($form->{'firsturl'} =~ m{^/tiny/$match_domain/\w+$}) {
+                 $env{'request.deeplink.login'} = $form->{'firsturl'};
+             }
+             if ($form->{'linkprot'}) {
+                 $env{'request.linkprot'} = $form->{'linkprot'};
+             } elsif ($form->{'linkkey'} ne '') {
+                 $env{'request.linkkey'} = $form->{'linkkey'};
+             }
+             my ($otherserver) = &Apache::lonnet::choose_server($udom);
+             $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
+         }
+     }
+     return $canhost;
+ }
+ sub noswitch {
+     my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
+                  '<h3>'.&mt('Session unavailable').'</h3>'.
+                  &mt('This LON-CAPA server is unable to host your session.').'<br />'.
+                  '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'.
+                  &Apache::loncommon::end_page();
+     return $result;
+ }
+ sub loginhelpdisplay {
+     my ($authdomain) = @_;
+     my $login_help = 1;
+     my $lang = &Apache::lonlocal::current_language();
+     if ($login_help) {
+         my $dom = $authdomain;
+         if ($dom eq '') {
+             $dom = &Apache::lonnet::default_login_domain();
+         }
+         my %domconfhash = &Apache::loncommon::get_domainconf($dom);
+         my $loginhelp_url;
+         if ($lang) {
+             $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
+             if ($loginhelp_url ne '') {
+                 return $loginhelp_url;
+             }
+         }
+         $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
+         if ($loginhelp_url ne '') {
+             return $loginhelp_url;
+         } else {
+             return '/adm/loginproblems.html';
+         }
+     }
+     return;
+ }
+;
+ __END__

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>

500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

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.

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Removed from v.1.84
changed lines
	Added in v.1.169