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Put reg exp check for domain logo in lonnet  - &is_domainimage()
checkauthen, publiccheck and lonacc all need this to serve images for log-in page if port 8080 is not in use.
Other possibilities - (1) call once in checkauthen and pass along to publiccheck and lonacc in Apache notes, or (2) modify loncapa_apach.conf.
lonhttpd to use a call to the same routine.

    1: # The LearningOnline Network
    2: # checks for a cokkie to authenticate a user
    3: #
    4: # $Id: checkauthen.pm,v 1.11 2007/04/11 21:36:58 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: 
   30: package Apache::checkauthen;
   31: 
   32: use strict;
   33: use Apache::Constants qw(:common);
   34: use Apache::lonnet;
   35: 
   36: sub handler {
   37:     my ($r) = @_;
   38: 
   39:     if (&Apache::lonnet::is_domainimage($r->uri)) {
   40:         return OK;
   41:     }
   42: 
   43:     if ($r->auth_type() ne 'LONCAPA') {
   44: 	return DECLINED;
   45:     }
   46:     my $fail = FORBIDDEN; 
   47:     if ($r->dir_config('lonOtherAuthen') eq 'yes') {
   48: 	if (defined($r->dir_config('lonOtherAuthenType'))) {
   49:             $r->auth_type($r->dir_config('lonOtherAuthenType'));
   50:         }
   51: 	#&Apache::lonnet::logthis("other authen");
   52: 	$fail = DECLINED;
   53:     }
   54: 
   55:     if ($env{'user.name'} eq 'public' 
   56: 	&& $env{'user.domain'} eq 'public') {
   57: 	if ($env{'request.publicaccess'} ) {
   58: 	    return OK;
   59: 	} else {
   60: 	    return $fail;
   61: 	}
   62:     }
   63: 
   64:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
   65:     my $lonid=$cookies{'lonID'};
   66:     my $handle;
   67:     if ($lonid) {
   68:       	$handle=&LONCAPA::clean_handle($lonid->value);
   69:         $handle = $r->dir_config('lonIDsDir')."/$handle.id";
   70:     } else {
   71:         $handle = $env{'user.environment'};
   72:     }
   73: 
   74:     if (($handle ne '') && (-e $handle)) {
   75:         return OK;
   76:     }
   77: 
   78:     return $fail;
   79: }
   80: 
   81: 1;