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added a preview for Daxe, updated automatically when the document is saved

    1: # The LearningOnline Network
    2: # Opening converted problems and directory listings for Daxe
    3: #
    4: # $Id: daxeopen.pm,v 1.2 2015/12/10 16:26:43 damieng Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: ###
   29: 
   30: package Apache::daxeopen;
   31: 
   32: use Apache::Constants;
   33: use DateTime;
   34: use Try::Tiny;
   35: use File::stat;
   36: use Fcntl ':mode';
   37: 
   38: use Apache::loncommon;
   39: use Apache::lonnet;
   40: use Apache::pre_xml;
   41: use Apache::html_to_xml;
   42: use Apache::post_xml;
   43: 
   44: 
   45: sub handler {
   46:     my $request = shift;
   47:     my $uri = $request->uri;
   48:     $uri =~ s/^\/daxeopen//;
   49:     &Apache::loncommon::no_cache($request);
   50:     if ($uri =~ /\/$/) {
   51:         return directory_listing($uri, $request);
   52:     } elsif ($uri =~ /\.(task|problem|exam|quiz|assess|survey|library)$/) {
   53:         return convert_problem($uri, $request);
   54:     } else {
   55:         # Apache should send other files directly
   56:         $request->status(406);
   57:         return OK;
   58:     }
   59: }
   60: 
   61: sub convert_problem {
   62:     my ($uri, $request) = @_;
   63:     
   64:     my $file = &Apache::lonnet::filelocation('', $uri);
   65:     &Apache::lonnet::repcopy($file);
   66:     if (! -e $file) {
   67:         $request->status(404);
   68:         return OK;
   69:     }
   70:     try {
   71:         my $warnings = 0; # no warning printed
   72:         my $textref = &Apache::pre_xml::pre_xml($file, $warnings);
   73:         $textref = &Apache::html_to_xml::html_to_xml($textref, $warnings);
   74:         my $text = &Apache::post_xml::post_xml($textref, $file, $warnings);
   75:         &Apache::loncommon::content_type($request, 'text/xml', 'utf-8');
   76:         $request->print($text);
   77:         return OK;
   78:     } catch {
   79:         $request->content_type('text/plain');
   80:         $request->print("convert failed for $file: $_");
   81:         $request->status(406);
   82:         return OK;
   83:     };
   84: }
   85: 
   86: sub directory_listing {
   87:     my ($uri, $request) = @_;
   88:     my $dirpath = &Apache::lonnet::filelocation('', $uri);
   89:     if (! -e $dirpath) {
   90:         $request->status(404);
   91:         return OK;
   92:     }
   93:     $dirpath =~ s/\/$//;
   94:     opendir my $dir, $dirpath or die "Cannot open directory: $dirpath";
   95:     my @files = readdir $dir;
   96:     closedir $dir;
   97:     my $res = '<?xml version="1.0" encoding="UTF-8"?>'."\n";
   98:     my $dirname = $dirpath;
   99:     $dirname =~ s/^.*\/([^\/]*)$/$1/;
  100:     $res .= "<directory name=\"$dirname\">\n";
  101:     foreach my $name (@files) {
  102:         if ($name eq '.' || $name eq '..') {
  103:             next;
  104:         }
  105:         if ($name =~ /\.(bak|log|meta|save)$/) {
  106:             next;
  107:         }
  108:         $sb = stat($dirpath.'/'.$name);
  109:         my $mode = $sb->mode;
  110:         if (S_ISDIR($mode)) {
  111:             $res .= "<directory name=\"$name\"/>\n";
  112:         } else {
  113:             $res .= "<file name=\"$name\"";
  114:             my $size = $sb->size; # total size of file, in bytes
  115:             $res .= " size=\"$size\"";
  116:             my $mtime = $sb->mtime; # last modify time in seconds since the epoch
  117:             my $dt = DateTime->from_epoch(epoch => $mtime);
  118:             my $modified = $dt->iso8601().'Z';
  119:             $res .= " modified=\"$modified\"";
  120:             $res .= "/>\n";
  121:         }
  122:     }
  123:     $res .= "</directory>\n";
  124:     &Apache::loncommon::content_type($request, 'text/xml', 'utf-8');
  125:     $request->print($res);
  126:     return OK;
  127: }
  128: 
  129: 1;
  130: __END__