[BACK]Return to lonsequence.pm CVS log [TXT] [DIR] Up to [LON-CAPA] / rat
File:  [LON-CAPA] / rat / lonsequence.pm
Revision 1.7: download - view: text, annotated - select for diffs
Tue Apr 2 21:17:34 2002 UTC (22 years, 2 months ago) by www
Branches: MAIN
CVS tags: stable_2002_april, HEAD
Never mind ... sorry ... nonsense

# The LearningOnline Network with CAPA
#
# Sequence Handler
#
# $Id: lonsequence.pm,v 1.7 2002/04/02 21:17:34 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# (Handler to resolve ambiguous file locations
#
# (TeX Content Handler
#
# 05/29/00,05/30,10/11 Gerd Kortemeyer)
#
# 10/11,10/12 Gerd Kortemeyer)
#
# 10/16 Gerd Kortemeyer

package Apache::lonsequence;

use strict;
use Apache::lonnet;
use Apache::Constants qw(:common :http REDIRECT);
use GDBM_File;


# ----------------------------------------------------------- Could not resolve

sub getlost {
    my ($r,$errmsg)=@_;
    $r->content_type('text/html');
    $r->send_http_header;
    $r->print(
 '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
 'LON-CAPA</h1>Could not handle sequence resource reference.<p>'.$errmsg.
 '</body></html>');
}

# ================================================================ Main Handler

sub handler {
   my $r=shift;

   if ($r->header_only) {
      $r->content_type('text/html');
      $r->send_http_header;
      return OK;
   }

   my %hash;
   my %bighash;
   my $requrl=$r->uri;

# ------------------------------------------------------------ Tie symb db file
  if ($ENV{'request.course.fn'}) {
       my $last;
       if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
                    &GDBM_READER,0640)) {
	   $last=$hash{'last_direction'};
           untie(%hash);
       }
       my $direction='';
       my $prevmap='';
       if ($last) {
	  ($prevmap,$direction)=(split(/\_\_\_/,$last));
       }
# ------------------------------------------------------------- Tie big db file
       if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                    &GDBM_READER,0640)) {
	   my $disid='';
           my $whatend='';
           if ($direction eq 'back') {
	       $disid=$bighash{'map_finish_'.$requrl};
               $whatend='End';
           } else {
               $disid=$bighash{'map_start_'.$requrl};
               $whatend='Beginning';
           } 
           my $disurl='';
           my $dismapid='';
           if ($disid) {
	       $disurl=$bighash{'src_'.$disid};
               $dismapid=(split(/\./,$disid))[1];
           }
           my $symb='';
           my $sequencetitle='';
           unless($disurl) {
               if ($symb=&Apache::lonnet::symbread()) {
		   my ($mapurl,$mapid)=split(/\_\_\_/,$symb);
                   $sequencetitle=$bighash{'title_'.
				          $bighash{'map_pc_/res/'.$mapurl}.'.'.
					  $mapid};
               }
           }
# --------------------------------------- Untie hash, make sure to come by here
           untie(%bighash);
           if ($disurl) {
# -------------------------------------------------- Has first or last resource
               &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
                   'last_known' => &Apache::lonnet::declutter($disurl)); 
	       $r->content_type('text/html');
               $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
               return REDIRECT;
           } else {
# ---------- Does not have first or last resource, try to find out where we are
               unless ($symb) {
		   $r->internal_redirect('/adm/ambiguous');
               }
               $r->content_type('text/html');
               $r->send_http_header;
               $r->print(<<ENDSYMB);
<html><body bgcolor="#FFFFFF">
<h2>$whatend of</h2>
<h1>$sequencetitle</h1>
</body></html>
ENDSYMB
               return OK
           }
       } else {
          &getlost($r,'Could not access course structure.');
          return OK;
       }
   } else {
      $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
      return HTTP_NOT_ACCEPTABLE; 
   }

   return OK;
}

1;
__END__
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
500 Internal Server Error

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at root@localhost to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.