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Applied shared flocks on the environment

    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: # 01/06,01/13,05/31,06/01,09/06,09/25,09/28,10/30,11/6,
    5: # 12/25,12/26,06/01 Gerd Kortemeyer
    6: 
    7: package Apache::lonacc;
    8: 
    9: use strict;
   10: use Apache::Constants qw(:common :http :methods);
   11: use Apache::File;
   12: use Apache::lonnet;
   13: use CGI::Cookie();
   14: use Fcntl qw(:flock);
   15: 
   16: sub handler {
   17:     my $r = shift;
   18:     my $requrl=$r->uri;
   19:     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
   20:     my $lonid=$cookies{'lonID'};
   21:     my $cookie;
   22:     if ($lonid) {
   23: 	my $handle=$lonid->value;
   24:         $handle=~s/\W//g;
   25:         my $lonidsdir=$r->dir_config('lonIDsDir');
   26:         if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
   27: 
   28: # ------------------------------------------- Transfer profile into environment
   29: 
   30:             my @profile;
   31: 	    {
   32:              my $idf=Apache::File->new("$lonidsdir/$handle.id");
   33:              flock($idf,LOCK_SH);
   34:              @profile=<$idf>;
   35:              $idf->close();
   36: 	    }
   37:             my $envi;
   38:             for ($envi=0;$envi<=$#profile;$envi++) {
   39: 		chomp($profile[$envi]);
   40: 		my ($envname,$envvalue)=split(/=/,$profile[$envi]);
   41:                 $ENV{$envname} = $envvalue;
   42:             }
   43:             $ENV{'user.environment'} = "$lonidsdir/$handle.id";
   44:             $ENV{'request.state'}    = "published";
   45:             $ENV{'request.filename'} = $r->filename;
   46: 
   47: # --------------------- Figure out referer, first from HTTP_REFERER, then cache
   48: 
   49:             my $referer='';
   50:             if ($referer=$r->header_in('Referer')) {
   51:                $ENV{'HTTP_REFERER'}=$referer;
   52: 	    } else {
   53: 	       $ENV{'HTTP_REFERER'}=$ENV{'httpref.'.$requrl};
   54: 	    }
   55: 
   56: # -------------------------------------------------------- Load POST parameters
   57: 
   58: 
   59:            
   60:         my $buffer;
   61: 
   62:         $r->read($buffer,$r->header_in('Content-length'));
   63: 
   64: 	unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) {
   65:             my @pairs=split(/&/,$buffer);
   66:             my $pair;
   67:             foreach $pair (@pairs) {
   68:                my ($name,$value) = split(/=/,$pair);
   69:                $value =~ tr/+/ /;
   70:                $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
   71:                $name  =~ tr/+/ /;
   72:                $name  =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
   73:                $ENV{"form.$name"}=$value;
   74:             }
   75:         } else {
   76: 	    my $contentsep=$1;
   77:             my @lines = split (/\n/,$buffer);
   78:             my $name='';
   79:             my $value='';
   80:             my $fname='';
   81:             my $fmime='';
   82:             my $i;
   83:             for ($i=0;$i<=$#lines;$i++) {
   84: 		if ($lines[$i]=~/^$contentsep/) {
   85: 		    if ($name) {
   86:                         chomp($value);
   87: 			if ($fname) {
   88: 			    $ENV{"form.$name.filename"}=$fname;
   89:                             $ENV{"form.$name.mimetype"}=$fmime;
   90:                         } else {
   91:                             $value=~s/\s+$//s;
   92:                         }
   93:                         $ENV{"form.$name"}=$value;
   94:                     }
   95:                     if ($i<$#lines) {
   96: 			$i++;
   97:                         $lines[$i]=~
   98: 		 /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
   99:                         $name=$1;
  100:                         $value='';
  101:                         if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
  102: 			   $fname=$1;
  103:                            if 
  104:                             ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {
  105: 			      $fmime=$1;
  106:                               $i++;
  107: 			   } else {
  108:                               $fmime='';
  109:                            }
  110:                         } else {
  111: 			    $fname='';
  112:                             $fmime='';
  113:                         }
  114:                         $i++;
  115:                     }
  116:                 } else {
  117: 		    $value.=$lines[$i]."\n";
  118:                 }
  119:             }
  120: 	}
  121:             $r->method_number(M_GET);
  122: 	    $r->method('GET');
  123:             $r->headers_in->unset('Content-length');
  124: 
  125: # ---------------------------------------------------------------- Check access
  126: 
  127:             if ($requrl!~/^\/adm\//) {
  128: 		my $access=&Apache::lonnet::allowed('bre',$requrl);
  129:                 if ($access eq '1') {
  130: 		   $ENV{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
  131: 	           return HTTP_NOT_ACCEPTABLE; 
  132:                 }
  133:                 if (($access ne '2') && ($access ne 'F')) {
  134: 		   $ENV{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
  135: 	           return HTTP_NOT_ACCEPTABLE; 
  136:                 }
  137:             } 
  138:             return OK; 
  139:         } else { 
  140:             $r->log_reason("Cookie $handle not valid", $r->filename) 
  141:         };
  142:     }
  143: 
  144: # ----------------------------------------------- Store where they wanted to go
  145: 
  146:     $ENV{'request.firsturl'}=$requrl;
  147:     return FORBIDDEN;
  148: }
  149: 
  150: 1;
  151: __END__