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    1: # The LearningOnline Network
    2: # Switch Servers Handler
    3: #
    4: # $Id: switchserver.pm,v 1.21 2007/11/15 01:17:16 albertel Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: 
   29: package Apache::switchserver;
   30: 
   31: use strict;
   32: use Apache::Constants qw(:common);
   33: use Apache::lonnet;
   34: use Apache::lonmenu;
   35: use CGI::Cookie();
   36: use Apache::lonlocal;
   37: 
   38: sub init_env {
   39:     my ($r) = @_;
   40:     
   41:     if (-e $env{'user.environment'}) {
   42: 	return  $env{'user.environment'};
   43:     }
   44:     my $requrl=$r->uri;
   45:     my $handle= &Apache::lonnet::check_for_valid_session($r);
   46:     if ($handle ne '') {
   47: 	return undef;
   48:     }
   49:     my $lonidsdir=$r->dir_config('lonIDsDir');
   50:     &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   51:     
   52:     return $r->dir_config('lonIDsDir')."/$handle.id";
   53: }
   54: 
   55: sub do_redirect {
   56:     my ($r,$url,$only_body,$extra_text) = @_;
   57:     $r->send_http_header;
   58:     my $start_page = 
   59: 	&Apache::loncommon::start_page('Switching Server ...',undef,
   60: 				       {'redirect'       => [0.5,$url],
   61:                                         'no_inline_link' => 1,
   62: 					'only_body'      => $only_body,});
   63:     my $end_page   = &Apache::loncommon::end_page();
   64:     $r->print($start_page.$extra_text.$end_page);
   65:     return OK;
   66: 
   67: }
   68: 
   69: sub handler {
   70:     my ($r) = @_;
   71:     
   72:     my $handle=&init_env($r);
   73:     if (!defined($handle)) { return FORBIDDEN; }
   74: 
   75:     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
   76: 					    ['otherserver','role']);
   77: 
   78:     my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
   79:     if (! $env{'form.otherserver'}) {
   80: 	$env{'form.otherserver'} =	
   81: 	    &Apache::lonnet::find_existing_session($env{'user.domain'},
   82: 						   $env{'user.name'});
   83: 	if (! $env{'form.otherserver'}) {
   84: 	    $env{'form.otherserver'} = 
   85: 		&Apache::lonnet::spareserver(30000,undef,1);
   86: 	}
   87: 
   88: 	$switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
   89:     }
   90: 
   91:     if (!defined($switch_to)) { return FORBIDDEN; }
   92: 
   93:     if ($env{'user.name'} eq 'public'
   94: 	&& $env{'user.domain'} eq 'public') {
   95: 	my $url = 'http://'.$switch_to.$r->uri;
   96: 	return &do_redirect($r,$url,1)
   97:     }
   98: 
   99:     if ($env{'form.role'} && 
  100: 	!exists($env{'user.role.'.$env{'form.role'}})) { return FORBIDDEN; }
  101: 
  102:     #remove session env, and log event
  103:     unlink($handle);
  104:     my %temp=('switchserver' => time.':'.$env{'form.otherserver'},
  105: 	      $env{'form.role'});
  106:     &Apache::lonnet::put('email_status',\%temp);
  107:     &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
  108: 			 $env{'user.home'},
  109: 			 "Switch Server to $env{'form.otherserver'} with role $env{'form.role'} $ENV{'REMOTE_ADDR'}");
  110: 
  111:     &Apache::loncommon::content_type($r,'text/html');
  112: 
  113:     #expire the cookie
  114:     my $c = new CGI::Cookie(-name    => 'lonID',
  115: 			    -value   => '',
  116: 			    -expires => '-10y',);
  117:     $r->header_out('Set-cookie' => $c);
  118: 
  119:     if ($r->header_only) {
  120: 	$r->send_http_header;
  121: 	return OK;
  122:     }
  123: # -------------------------------------------------------- Menu script and info
  124: 	   
  125:     my $windowinfo=
  126: 	&Apache::lonmenu::close().
  127: 	&Apache::lonnavmaps::close();
  128: # ---------------------------------------------------------------- Get handover
  129: 
  130:     my %info=('ip'       => $ENV{'REMOTE_ADDR'},
  131: 	      'domain'   => $env{'user.domain'},
  132: 	      'username' => $env{'user.name'},
  133: 	      'role'     => $env{'form.role'},
  134: 	      'server'   => $r->dir_config('lonHostID'));
  135:     if ($env{'request.sso.login'}) {
  136: 	$info{'sso.login'} = $env{'request.sso.login'};
  137:     }
  138:     if ($env{'request.sso.reloginserver'}) {
  139:         $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
  140:     }
  141:     my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
  142:     my $url ='http://'.$switch_to.'/adm/login?'.
  143: 	'domain='.$env{'user.domain'}.
  144: 	'&username='.$env{'user.name'}.
  145: 	'&token='.$token;
  146: # --------------------------------------------------------------- Screen Output
  147:     &Apache::lonnet::flushcourselogs();
  148:     return &do_redirect($r,$url,0,$windowinfo);
  149: }
  150: 
  151: 1;
  152: __END__
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