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- Following the switch to 2.10, domains may prefer that their users do not have sessions hosted on older versions of LON-CAPA.
- Domain Coordinators can control:
  (a) where their users may have sessions hosted (by domain and/or LON-CAPA version).
  (b) which other domains will have user sessions hosted on servers in the domain.

    1: # The LearningOnline Network
    2: # Switch Servers Handler
    3: #
    4: # $Id: switchserver.pm,v 1.26 2010/07/17 20:02:02 raeburn 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: 					'only_body'      => $only_body,});
   62:     my $end_page   = &Apache::loncommon::end_page();
   63:     $r->print($start_page.$extra_text.$end_page);
   64:     return OK;
   65: 
   66: }
   67: 
   68: sub handler {
   69:     my ($r) = @_;
   70:     
   71:     my $handle=&init_env($r);
   72:     if (!defined($handle)) { return FORBIDDEN; }
   73: 
   74:     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
   75: 				['otherserver','role','origurl','symb']);
   76: 
   77:     my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
   78:     if (! $env{'form.otherserver'}) {
   79: 	$env{'form.otherserver'} =	
   80: 	    &Apache::lonnet::find_existing_session($env{'user.domain'},
   81: 						   $env{'user.name'});
   82: 	if (! $env{'form.otherserver'}) {
   83: 	    $env{'form.otherserver'} = 
   84: 		&Apache::lonnet::spareserver(30000,undef,1);
   85: 	}
   86:         
   87: 	$switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
   88:     }
   89: 
   90:     if (!defined($switch_to)) { return FORBIDDEN; }
   91: 
   92:     if ($env{'user.name'} eq 'public'
   93: 	&& $env{'user.domain'} eq 'public') {
   94: 	my $url = 'http://'.$switch_to.$r->uri;
   95: 	return &do_redirect($r,$url,1)
   96:     }
   97: 
   98:     my $canhost = 1;
   99:     my @machinedoms = &Apache::lonnet::machine_domains($switch_to);
  100:     unless (grep(/^\Q$env{'user.domain'}\E/,@machinedoms)) {
  101:         my $machinedom = &Apache::lonnet::host_domain($env{'form.otherserver'});
  102:         my %defdomdefaults = &Apache::lonnet::get_domain_defaults($machinedom);
  103:         my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
  104:         my $remoterev = &Apache::lonnet::get_server_loncaparev($env{'user.domain'},$env{'form.otherserver'});
  105:         $canhost = &Apache::lonnet::can_host_session($env{'user.domain'},$machinedom,
  106:                                                      $remoterev,$udomdefaults{'remotesessions'},
  107:                                                      $defdomdefaults{'hostedsessions'});
  108:     }
  109: 
  110:     unless ($canhost) { return FORBIDDEN; }
  111: 
  112:     if ($env{'form.role'} && 
  113: 	!exists($env{'user.role.'.$env{'form.role'}})) { return FORBIDDEN; }
  114: 
  115:     #remove session env, and log event
  116:     unlink($handle);
  117:     my %temp=('switchserver' => time.':'.$env{'form.otherserver'},
  118: 	      $env{'form.role'});
  119:     &Apache::lonnet::put('email_status',\%temp);
  120:     &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
  121: 			 $env{'user.home'},
  122: 			 "Switch Server to $env{'form.otherserver'} with role $env{'form.role'} $ENV{'REMOTE_ADDR'}");
  123: 
  124:     &Apache::loncommon::content_type($r,'text/html');
  125: 
  126:     #expire the cookie
  127:     my $c = new CGI::Cookie(-name    => 'lonID',
  128: 			    -value   => '',
  129: 			    -expires => '-10y',);
  130:     $r->header_out('Set-cookie' => $c);
  131: 
  132:     if ($r->header_only) {
  133: 	$r->send_http_header;
  134: 	return OK;
  135:     }
  136: # -------------------------------------------------------- Menu script and info
  137: 	   
  138: # ---------------------------------------------------------------- Get handover
  139: 
  140:     my %info=('ip'       => $ENV{'REMOTE_ADDR'},
  141: 	      'domain'   => $env{'user.domain'},
  142: 	      'username' => $env{'user.name'},
  143: 	      'role'     => $env{'form.role'},
  144: 	      'server'   => $r->dir_config('lonHostID'));
  145:     if ($env{'form.origurl'}) {
  146:         $info{'origurl'} = $env{'form.origurl'};
  147:     }
  148:     if ($env{'form.symb'}) {
  149:         $info{'symb'} = $env{'form.symb'};
  150:     }
  151:     if ($env{'request.sso.login'}) {
  152: 	$info{'sso.login'} = $env{'request.sso.login'};
  153:     }
  154:     if ($env{'request.sso.reloginserver'}) {
  155:         $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
  156:     }
  157:     my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
  158:     my $url ='http://'.$switch_to.'/adm/login?'.
  159: 	'domain='.$env{'user.domain'}.
  160: 	'&username='.$env{'user.name'}.
  161: 	'&token='.$token;
  162: # --------------------------------------------------------------- Screen Output
  163:     &Apache::lonnet::flushcourselogs();
  164:     return &do_redirect($r, $url, 0);
  165: }
  166: 
  167: 1;
  168: __END__
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