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Up to [LON-CAPA] / loncom / auth

- when offloading a user session to a different server, check the remote
  servers for an existing session and pick one of those first
  - new lond command that checks if a session file exists for a specific user
  - new lonnet routines to probe servers for one

    1: # The LearningOnline Network
    2: # Switch Servers Handler
    3: #
    4: # $Id: switchserver.pm,v 1.17 2007/09/29 04:03:46 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 %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
   46:     my $lonid=$cookies{'lonID'};
   47:     my $cookie;
   48:     if (!$lonid) { return undef; }
   49: 
   50:     my $handle=&LONCAPA::clean_handle($lonid->value);
   51:     my $lonidsdir=$r->dir_config('lonIDsDir');
   52:     if ((!-e "$lonidsdir/$handle.id") || ($handle eq '')) {
   53: 	$r->log_reason("Cookie $handle not valid", $r->filename); 
   54: 	return undef;
   55:     }
   56: 
   57:     &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   58:     
   59:     return $r->dir_config('lonIDsDir')."/$handle.id";
   60: }
   61: 
   62: sub do_redirect {
   63:     my ($r,$url,$only_body,$extra_text) = @_;
   64:     $r->send_http_header;
   65:     my $start_page = 
   66: 	&Apache::loncommon::start_page('Switching Server ...',undef,
   67: 				       {'redirect'       => [0.5,$url],
   68:                                         'no_inline_link' => 1,
   69: 					'only_body'      => $only_body,});
   70:     my $end_page   = &Apache::loncommon::end_page();
   71:     $r->print($start_page.$extra_text.$end_page);
   72:     return OK;
   73: 
   74: }
   75: 
   76: sub handler {
   77:     my ($r) = @_;
   78:     
   79:     my $handle=&init_env($r);
   80:     if (!defined($handle)) { return FORBIDDEN; }
   81: 
   82:     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
   83: 					    ['otherserver','role']);
   84: 
   85:     my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
   86:     if (! $env{'form.otherserver'}) {
   87: 	$env{'form.otherserver'} =	
   88: 	    &Apache::lonnet::find_existing_session($env{'user.domain'},
   89: 						   $env{'user.name'});
   90: 	if (! $env{'form.otherserver'}) {
   91: 	    $env{'form.otherserver'} = 
   92: 		&Apache::lonnet::spareserver(30000,undef,1);
   93: 	}
   94: 
   95: 	$switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
   96:     }
   97: 
   98:     if (!defined($switch_to)) { return FORBIDDEN; }
   99: 
  100:     if ($env{'user.name'} eq 'public'
  101: 	&& $env{'user.domain'} eq 'public') {
  102: 	my $url = 'http://'.$switch_to.'/'.$r->uri;
  103: 	return &do_redirect($r,$url,1)
  104:     }
  105: 
  106:     if ($env{'form.role'} && 
  107: 	!exists($env{'user.role.'.$env{'form.role'}})) { return FORBIDDEN; }
  108: 
  109:     #remove session env, and log event
  110:     unlink($handle);
  111:     my %temp=('switchserver' => time.':'.$env{'form.otherserver'},
  112: 	      $env{'form.role'});
  113:     &Apache::lonnet::put('email_status',\%temp);
  114:     &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
  115: 			 $env{'user.home'},
  116: 			 "Switch Server to $env{'form.otherserver'} with role $env{'form.role'} $ENV{'REMOTE_ADDR'}");
  117: 
  118:     &Apache::loncommon::content_type($r,'text/html');
  119: 
  120:     #expire the cookie
  121:     my $c = new CGI::Cookie(-name    => 'lonID',
  122: 			    -value   => '',
  123: 			    -expires => '-10y',);
  124:     $r->header_out('Set-cookie' => $c);
  125:     $r->send_http_header;
  126:     return OK if $r->header_only;
  127: # -------------------------------------------------------- Menu script and info
  128: 	   
  129:     my $windowinfo=
  130: 	&Apache::lonmenu::close().
  131: 	&Apache::lonnavmaps::close();
  132: # ---------------------------------------------------------------- Get handover
  133: 
  134:     my %info=('ip'       => $ENV{'REMOTE_ADDR'},
  135: 	      'domain'   => $env{'user.domain'},
  136: 	      'username' => $env{'user.name'},
  137: 	      'role'     => $env{'form.role'},
  138: 	      'server'   => $r->dir_config('lonHostID'));
  139:     if ($env{'request.sso.login'}) {
  140: 	$info{'sso.login'} = $env{'request.sso.login'};
  141:     }
  142:     if ($env{'request.sso.reloginserver'}) {
  143:         $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
  144:     }
  145:     my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
  146:     my $url ='http://'.$switch_to.'/adm/login?'.
  147: 	'domain='.$env{'user.domain'}.
  148: 	'&username='.$env{'user.name'}.
  149: 	'&token='.$token;
  150: # --------------------------------------------------------------- Screen Output
  151:     &Apache::lonnet::flushcourselogs();
  152:     return &do_redirect($r,$url,0,$windowinfo);
  153: }
  154: 
  155: 1;
  156: __END__
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