File:  [LON-CAPA] / loncom / homework / daxesave.pm
Revision 1.5: download - view: text, annotated - select for diffs
Tue Dec 13 21:37:35 2016 UTC (5 years, 5 months ago) by damieng
Branches: MAIN
CVS tags: version_2_12_X, HEAD
only try to convert XML files when saving

# The LearningOnline Network
# Convert and save a problem from Daxe.
#
# $Id: daxesave.pm,v 1.5 2016/12/13 21:37:35 damieng 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/
#
###

package Apache::daxesave;

use Apache::Constants;
use Apache::lonnet;
use Try::Tiny;
use File::Copy;

use Apache::lonacc;
use Apache::loncommon;
use Apache::xml_to_loncapa;

sub handler {
    my $request = shift;
    
    $request->content_type('text/plain');
    
    # path should be in the form "/daxeopen/priv/..."
    # or ^/daxeopen/uploaded/[^/]+/[^/]+/.*html?$
    my $path = $env{'form.path'};
    $path =~ s/^\/daxeopen//;
    
    my $allowed = 0;
    if ($path =~ /^\/priv/) {
        my ($ownername,$ownerdom,$ownerhome) = 
            &Apache::lonnet::constructaccess($path, 'setpriv');
        if (($ownername ne '') && ($ownerdom ne '') && ($ownerhome ne '')) {
            unless ($ownerhome eq 'no_host') {
                my @hosts = &Apache::lonnet::current_machine_ids();
                if (grep(/^\Q$ownerhome\E$/,@hosts)) {
                    $allowed = 1;
                }
            }
        }
    } elsif ($path =~ m|^/uploaded/[^/]+/[^/]+/|) {
        if ($env{'user.name'} ne '' && $env{'user.domain'} ne '' && $env{'request.course.id'}) {
            $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
            $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
            if ($path =~ m|^/uploaded/\Q$cdom\E/\Q$cnum\E/| && $path !~ /\.\./) {
                if (&Apache::lonnet::allowed('mdc', $env{'request.course.id'})) {
                    $allowed = 1;
                }
            }
        }
    }
    unless ($allowed) {
        $request->log_reason("Unauthorized path: $path", $path);
        $request->print("error\nUnauthorized path: $path");
        $request->status(403);
        return OK;
    }

    my $newpath = &Apache::lonnet::filelocation('', $path);

    my $contents = $env{'form.file'};
    
    my $mode;
    if ($path =~ /\.(task|problem|exam|quiz|assess|survey|library|xml|html|htm|xhtml|xhtm)$/) {
        try {
            $contents = &Apache::xml_to_loncapa::convert_file($contents);
        } catch {
            $request->print("error\nconvert failed for $path: $_");
            return OK;
        };
        $mode = '>:encoding(UTF-8)';
    } else {
        $mode = '>';
    }
    
    my $filebak = $newpath.".bak";
    if (-e $newpath) {
        copy($newpath, $filebak); # errors ignored
    }
    open my $out, $mode, $newpath;
    print $out $contents;
    close $out;
    
    $request->print("ok\n");
    return OK;
}

1;
__END__

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