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File:  [LON-CAPA] / rat / lonsequence.pm
Revision 1.5: download - view: text, annotated - select for diffs
Thu Nov 29 19:23:49 2001 UTC (22 years, 5 months ago) by www
Branches: MAIN
CVS tags: stable_2002_spring, HEAD
GPL

    1: # The LearningOnline Network with CAPA
    2: #
    3: # Sequence Handler
    4: #
    5: # $Id: lonsequence.pm,v 1.5 2001/11/29 19:23:49 www Exp $
    6: #
    7: # Copyright Michigan State University Board of Trustees
    8: #
    9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   10: #
   11: # LON-CAPA is free software; you can redistribute it and/or modify
   12: # it under the terms of the GNU General Public License as published by
   13: # the Free Software Foundation; either version 2 of the License, or
   14: # (at your option) any later version.
   15: #
   16: # LON-CAPA is distributed in the hope that it will be useful,
   17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   19: # GNU General Public License for more details.
   20: #
   21: # You should have received a copy of the GNU General Public License
   22: # along with LON-CAPA; if not, write to the Free Software
   23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   24: #
   25: # /home/httpd/html/adm/gpl.txt
   26: #
   27: # http://www.lon-capa.org/
   28: #
   29: # (Handler to resolve ambiguous file locations
   30: #
   31: # (TeX Content Handler
   32: #
   33: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
   34: #
   35: # 10/11,10/12 Gerd Kortemeyer)
   36: #
   37: # 10/16 Gerd Kortemeyer
   38: 
   39: package Apache::lonsequence;
   40: 
   41: use strict;
   42: use Apache::lonnet;
   43: use Apache::Constants qw(:common :http REDIRECT);
   44: use GDBM_File;
   45: 
   46: 
   47: # ----------------------------------------------------------- Could not resolve
   48: 
   49: sub getlost {
   50:     my ($r,$errmsg)=@_;
   51:     $r->content_type('text/html');
   52:     $r->send_http_header;
   53:     $r->print(
   54:  '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
   55:  'LON-CAPA</h1>Could not handle sequence resource reference.<p>'.$errmsg.
   56:  '</body></html>');
   57: }
   58: 
   59: # ================================================================ Main Handler
   60: 
   61: sub handler {
   62:    my $r=shift;
   63: 
   64:    if ($r->header_only) {
   65:       $r->content_type('text/html');
   66:       $r->send_http_header;
   67:       return OK;
   68:    }
   69: 
   70:    my %hash;
   71:    my %bighash;
   72:    my $requrl=$r->uri;
   73: 
   74: # ------------------------------------------------------------ Tie symb db file
   75:   if ($ENV{'request.course.fn'}) {
   76:        my $last;
   77:        if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
   78:                     &GDBM_READER,0640)) {
   79: 	   $last=$hash{'last_direction'};
   80:            untie(%hash);
   81:        }
   82:        my $direction='';
   83:        my $prevmap='';
   84:        if ($last) {
   85: 	  ($prevmap,$direction)=(split(/\_\_\_/,$last));
   86:        }
   87: # ------------------------------------------------------------- Tie big db file
   88:        if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
   89:                     &GDBM_READER,0640)) {
   90: 	   my $disid='';
   91:            my $whatend='';
   92:            if ($direction eq 'back') {
   93: 	       $disid=$bighash{'map_finish_'.$requrl};
   94:                $whatend='End';
   95:            } else {
   96:                $disid=$bighash{'map_start_'.$requrl};
   97:                $whatend='Beginning';
   98:            } 
   99:            my $disurl='';
  100:            my $dismapid='';
  101:            if ($disid) {
  102: 	       $disurl=$bighash{'src_'.$disid};
  103:                $dismapid=(split(/\./,$disid))[1];
  104:            }
  105:            my $symb='';
  106:            my $sequencetitle='';
  107:            unless($disurl) {
  108:                if ($symb=&Apache::lonnet::symbread()) {
  109: 		   my ($mapurl,$mapid)=split(/\_\_\_/,$symb);
  110:                    $sequencetitle=$bighash{'title_'.
  111: 				          $bighash{'map_pc_/res/'.$mapurl}.'.'.
  112: 					  $mapid};
  113:                }
  114:            }
  115: # --------------------------------------- Untie hash, make sure to come by here
  116:            untie(%bighash);
  117:            if ($disurl) {
  118: # -------------------------------------------------- Has first or last resource
  119:                &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
  120:                    'last_known' => &Apache::lonnet::declutter($disurl)); 
  121: 	       $r->content_type('text/html');
  122:                $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
  123:                return REDIRECT;
  124:            } else {
  125: # ---------- Does not have first or last resource, try to find out where we are
  126:                unless ($symb) {
  127: 		   $r->internal_redirect('/adm/ambiguous');
  128:                }
  129:                $r->content_type('text/html');
  130:                $r->send_http_header;
  131:                $r->print(<<ENDSYMB);
  132: <html><body bgcolor="#FFFFFF">
  133: <h2>$whatend of</h2>
  134: <h1>$sequencetitle</h1>
  135: </body></html>
  136: ENDSYMB
  137:                return OK
  138:            }
  139:        } else {
  140:           &getlost($r,'Could not access course structure.');
  141:           return OK;
  142:        }
  143:    } else {
  144:       $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
  145:       return HTTP_NOT_ACCEPTABLE; 
  146:    }
  147: 
  148:    return OK;
  149: }
  150: 
  151: 1;
  152: __END__
  153: 
  154: 
  155: 
  156: 
  157: 
  158: 
  159:
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