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Tries to figure out referer a little harder to work with subrequests from
Java applets

    1: # The LearningOnline Network
    2: # Cookie Based Access Handler
    3: # 5/21/99,5/22,5/29,5/31,6/15,16/11,22/11,
    4: # 01/06,01/13,05/31,06/01,09/06,09/25,09/28,10/30 Gerd Kortemeyer
    5: 
    6: package Apache::lonacc;
    7: 
    8: use strict;
    9: use Apache::Constants qw(:common :http :methods);
   10: use Apache::File;
   11: use Apache::lonnet;
   12: use CGI::Cookie();
   13: 
   14: sub handler {
   15:     my $r = shift;
   16:     my $requrl=$r->uri;
   17:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
   18:     my $lonid=$cookies{'lonID'};
   19:     my $cookie;
   20:     if ($lonid) {
   21: 	my $handle=$lonid->value;
   22:         $handle=~s/\W//g;
   23:         my $lonidsdir=$r->dir_config('lonIDsDir');
   24:         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
   25: 
   26: # ------------------------------------------- Transfer profile into environment
   27: 
   28:             my @profile;
   29: 	    {
   30:              my $idf=Apache::File->new("$lonidsdir/$handle.id");
   31:              @profile=<$idf>;
   32: 	    }
   33:             my $envi;
   34:             for ($envi=0;$envi<=$#profile;$envi++) {
   35: 		chomp($profile[$envi]);
   36: 		my ($envname,$envvalue)=split(/=/,$profile[$envi]);
   37:                 $ENV{$envname} = $envvalue;
   38:             }
   39:             $ENV{'user.environment'} = "$lonidsdir/$handle.id";
   40:             $ENV{'request.state'}    = "published";
   41:             $ENV{'request.filename'} = $r->filename;
   42: 
   43: # ---- Figure out referer, first from HTTP_REFERER, then cache, then wild guess
   44: 
   45:             my $referer='';
   46:             if ($referer=$r->header_in('Referer')) {
   47:                $ENV{'HTTP_REFERER'}=$referer;
   48: 	    } else {
   49: 	       $ENV{'HTTP_REFERER'}=$ENV{'httpref.'.$requrl};
   50:                unless($ENV{'HTTP_REFERER'}) {
   51: 		   my $pathpart=$requrl;
   52:                    $pathpart=~s/\/[\w\.]*$//;
   53:                    map {
   54: 		       if ($_=~/^httpref.$pathpart/) {
   55: 			   $ENV{'HTTP_REFERER'}=$ENV{$_};
   56:                        }
   57:                    } keys %ENV;
   58:                }
   59: 	    }
   60: 
   61: # -------------------------------------------------------- Load POST parameters
   62: 
   63: 
   64:            
   65:             my $buffer;
   66: 
   67:             $r->read($buffer,$r->header_in('Content-length'));
   68:             my @pairs=split(/&/,$buffer);
   69:             my $pair;
   70:             foreach $pair (@pairs) {
   71:                my ($name,$value) = split(/=/,$pair);
   72:                $value =~ tr/+/ /;
   73:                $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
   74:                $name  =~ tr/+/ /;
   75:                $name  =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
   76:                $ENV{"form.$name"}=$value;
   77:             }
   78: 
   79:             $r->method_number(M_GET);
   80: 	    $r->method('GET');
   81:             $r->headers_in->unset('Content-length');
   82: 
   83: # ---------------------------------------------------------------- Check access
   84: 
   85:             if ($requrl!~/^\/adm\//) {
   86: 		my $access=&Apache::lonnet::allowed('bre',$requrl);
   87:                 if ($access eq '1') {
   88: 		   $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
   89: 	           return HTTP_NOT_ACCEPTABLE; 
   90:                 }
   91:                 if (($access ne '2') && ($access ne 'F')) {
   92: 		   $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
   93: 	           return HTTP_NOT_ACCEPTABLE; 
   94:                 }
   95:             } 
   96:             return OK; 
   97:         } else { 
   98:             $r->log_reason("Cookie $handle not valid", $r->filename) 
   99:         };
  100:     }
  101: 
  102: # ----------------------------------------------- Store where they wanted to go
  103: 
  104:     $ENV{'request.firsturl'}=$requrl;
  105:     return FORBIDDEN;
  106: }
  107: 
  108: 1;
  109: __END__