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File:  [LON-CAPA] / loncom / interface / lonmeta.pm
Revision 1.9: download - view: text, annotated - select for diffs
Sat Dec 22 21:59:07 2001 UTC (22 years, 4 months ago) by www
Branches: MAIN
CVS tags: HEAD
Starting to get and compute dynamic metadata

# The LearningOnline Network with CAPA
# Metadata display handler
#
# $Id: lonmeta.pm,v 1.9 2001/12/22 21:59:07 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/
#
# (TeX Content Handler
#
# 05/29/00,05/30,10/11 Gerd Kortemeyer)
#
# 10/19,10/21,10/23,11/27,08/09/01,12/22 Gerd Kortemeyer

package Apache::lonmeta;

use strict;
use Apache::Constants qw(:common);
use Apache::lonnet();

# ----------------------------------------- Fetch and evaluate dynamic metadata

sub dynamicmeta {
    my $url=&Apache::lonnet::declutter(shift);
    $url=~s/\.meta$//;
    my ($adomain,$aauthor)=($url=~/^(\w+)\/(\w+)\//);
    my $regexp=&Apache::lonnet::escape($url);
    $regexp=~s/(\W)/\\$1/g;
    my %evaldata=&Apache::lonnet::dump
                                     ('resevaldata',$adomain,$aauthor,$regexp);
    my %returnhash=();
    foreach (keys %evaldata) {
    }
    return %returnhash;
}

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

sub handler {
  my $r=shift;
  my %content=();

# ----------------------------------------------------------- Set document type

  $r->content_type('text/html');
  $r->send_http_header;

  return OK if $r->header_only;

# ------------------------------------------------------------------- Read file

  my $uri=$r->uri;
  map {
      $content{$_}=&Apache::lonnet::metadata($uri,$_);
  } split(/\,/,&Apache::lonnet::metadata($uri,'keys'));

# ------------------------------------------------------------------ Hide stuff

  unless ($ENV{'user.adv'}) {
      map {
          $content{$_}='<i>- not displayed -</i>';
      } ('keywords','notes','abstract','subject');
  }

# --------------------------------------------------------------- Render Output

my $creationdate=localtime($content{'creationdate'});
my $lastrevisiondate=localtime($content{'lastrevisiondate'});
  
  $r->print(<<ENDHEAD);
<html><head><title>Catalog Information</title></head>
<body bgcolor="#FFFFFF">
<h1>Catalog Information</h1>
<h2>$content{'title'}</h2>
<h3>Author(s): $content{'author'}</h3>
<b>Subject:</b> $content{'subject'}<br>
<b>Keyword(s):</b> $content{'keywords'}<br>
<b>Notes:</b> $content{'notes'}<br>
<b>Abstract:</b>
<blockquote>$content{'abstract'}</blockquote>
<hr>
<b>MIME Type:</b> $content{'mime'}<br>
<b>Language:</b> $content{'language'}<br>
<b>Creation Date:</b> $creationdate<br>
<b>Last Revision Date:</b> $lastrevisiondate<br>
<b>Publisher/Owner:</b> $content{'owner'}<br>
<b>Copyright/Distribution:</b> $content{'copyright'}
<hr>
ENDHEAD
  delete($content{'title'});
  delete($content{'author'});
  delete($content{'subject'});
  delete($content{'keywords'});
  delete($content{'notes'});
  delete($content{'abstract'});
  delete($content{'mime'});
  delete($content{'language'});
  delete($content{'creationdate'});
  delete($content{'lastrevisiondate'});
  delete($content{'owner'});
  delete($content{'copyright'});
  if ($ENV{'user.adv'}) {
   map {
      my $name=$_;
      my $display=&Apache::lonnet::metadata($uri,$name.'.display');
      unless ($display) { $display=$name; };
      my $otherinfo='';
      map {
          if (defined(&Apache::lonnet::metadata($uri,$name.'.'.$_))) {
             $otherinfo.=' '.$_.'='.
		 &Apache::lonnet::metadata($uri,$name.'.'.$_).'; ';
          }
      } ('name','part','type','default'); 
      $r->print('<b>'.$display.':</b> '.$content{$name});
      if ($otherinfo) {
         $r->print(' ('.$otherinfo.')');
      }
      $r->print("<br>\n");
   } sort keys %content;
  }
  &dynamicmeta($uri);
  $r->print('</body></html>');
  return OK;
}

1;
__END__
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