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- Support use of pop-up browser to insert image files into HTML files
  uploaded to Main Content or Supplemental Content areas of a course.

    1: # The LearningOnline Network
    2: # Convert and save a problem from Daxe.
    3: #
    4: # $Id: daxesave.pm,v 1.7 2023/08/28 18:58:44 raeburn 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::daxesave;
   31: use strict;
   32: 
   33: use Apache::Constants qw(:common);
   34: use Apache::lonnet;
   35: use Try::Tiny;
   36: use File::Copy;
   37: 
   38: use Apache::lonacc;
   39: use Apache::loncommon;
   40: use Apache::xml_to_loncapa;
   41: 
   42: sub handler {
   43:     my $request = shift;
   44:     
   45:     $request->content_type('text/plain');
   46:     
   47:     # path should be in the form "/daxeopen/priv/..."
   48:     # or "/daxeopen/uploaded/$cdom/$cnum/(docs|supplemental)/(default|\d+)/\d+/"
   49:     my $path = $env{'form.path'};
   50:     $path =~ s/^\/daxeopen//;
   51:     
   52:     my $allowed = 0;
   53:     my ($cdom,$cnum);
   54:     if ($path =~ m{^/priv/}) {
   55:         my ($ownername,$ownerdom,$ownerhome) = 
   56:             &Apache::lonnet::constructaccess($path);
   57:         if (($ownername ne '') && ($ownerdom ne '') && ($ownerhome ne '')) {
   58:             unless ($ownerhome eq 'no_host') {
   59:                 my @hosts = &Apache::lonnet::current_machine_ids();
   60:                 if (grep(/^\Q$ownerhome\E$/,@hosts)) {
   61:                     $allowed = 1;
   62:                 }
   63:             }
   64:         }
   65:     } elsif ($path =~ m|^/uploaded/|) {
   66:         if ($env{'user.name'} ne '' && $env{'user.domain'} ne '' && $env{'request.course.id'}) {
   67:             $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
   68:             $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
   69:             if ($path =~ m|^/uploaded/\Q$cdom\E/\Q$cnum\E/| && $path !~ /\.\./) {
   70:                 if (&Apache::lonnet::allowed('mdc', $env{'request.course.id'})) {
   71:                     $allowed = 1;
   72:                 }
   73:             }
   74:         }
   75:     }
   76:     unless ($allowed) {
   77:         $request->log_reason("Unauthorized path: $path", $path);
   78:         $request->print("error\nUnauthorized path: $path");
   79:         $request->status(403);
   80:         return OK;
   81:     }
   82: 
   83:     if ($path =~ m{^/priv/}) {
   84:         my $newpath = &Apache::lonnet::filelocation('', $path);
   85:         my $contents = $env{'form.file'};
   86:     
   87:         my $mode;
   88:         if ($path =~ /\.(task|problem|exam|quiz|assess|survey|library|xml|html|htm|xhtml|xhtm)$/) {
   89:             try {
   90:                 $contents = &Apache::xml_to_loncapa::convert_file($contents);
   91:             } catch {
   92:                 $request->print("error\nconvert failed for $path: $_");
   93:                 return OK;
   94:             };
   95:             $mode = '>:encoding(UTF-8)';
   96:         } else {
   97:             $mode = '>';
   98:         }
   99:   
  100:         my $filebak = $newpath.".bak";
  101:         if (-e $newpath) {
  102:             copy($newpath, $filebak); # errors ignored
  103:         }
  104:         if (open(my $out, $mode, $newpath)) {
  105:             print $out $contents;
  106:             close($out);
  107:             $request->print("ok\n");
  108:         } else {
  109:             $request->print("error\nFailed to open file to save $path");
  110:         }
  111:     } elsif ($path =~ m{^/uploaded/}) {
  112:         my ($unauthorized,$unsupported);
  113:         if ($path =~ m{^\Q/uploaded/$cdom/$cnum/\E(docs|supplemental)/(default|\d+)/(\d+)/(.+)$}) {
  114:             my ($type,$folder,$rid,$fname) = ($1,$2,$3,$4);
  115:             my $referrer = $request->headers_in->{'Referer'};
  116:             if ($referrer =~ m{\Qfile=/daxeopen/uploaded/$cdom/$cnum/$type/$folder/$rid/\E}) {
  117:                 if ($fname =~ /\.(html|htm|xhtml|xhtm)$/) {
  118:                     try {
  119:                         $env{'form.file'} = &Apache::xml_to_loncapa::convert_file($env{'form.file'});
  120:                     } catch {
  121:                         $request->print("error\nconvert failed for $fname: $_");
  122:                         return OK;
  123:                     }
  124:                 } elsif ($fname =~ /\.(task|problem|exam|quiz|assess|survey|library|xml)$/) {
  125:                     $unsupported = $1;
  126:                 }
  127:                 unless ($unsupported) {
  128:                     my $url = &Apache::lonnet::finishuserfileupload($cnum,$cdom,'file',
  129:                                                                     "$type/$folder/$rid/$fname");
  130:                     if ($url =~ m{^/uploaded/$cdom/$cnum/$type/$folder/$rid/}) {
  131:                         $request->print("ok\n");
  132:                     } else {
  133:                         $request->print("error\nFailed to save uploaded file: $fname");
  134:                     }
  135:                 }
  136:             } else {
  137:                 $unauthorized = 1;
  138:             }
  139:         } else {
  140:             $unauthorized = 1;
  141:         }
  142:         if ($unauthorized) {
  143:             $request->log_reason("Unauthorized path: $path", $path);
  144:             $request->print("error\nUnauthorized path: $path");
  145:             $request->status(403);
  146:         } elsif ($unsupported) {
  147:             $request->log_reason("File extension: $unsupported -- not allowed for upload to course", $path);
  148:             $request->print("error\nFile extension: $unsupported -- not allowed for upload to course");
  149:             $request->status(403);
  150:         }
  151:     }
  152:     return OK;
  153: }
  154: 
  155: 1;
  156: __END__