File:  [LON-CAPA] / loncom / homework / daxeopen.pm
Revision 1.6: download - view: text, annotated - select for diffs
Fri Feb 24 17:34:55 2017 UTC (7 years, 1 month ago) by damieng
Branches: MAIN
CVS tags: HEAD
improved Daxe chooser dialog navigation, adding /priv/, /priv/domain/, size and date modified for /res files

# The LearningOnline Network
# Opening converted problems and directory listings for Daxe
#
# $Id: daxeopen.pm,v 1.6 2017/02/24 17:34:55 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::daxeopen;

use Apache::Constants;
use DateTime;
use Try::Tiny;
use File::stat;
use Fcntl ':mode';

use LONCAPA qw(:match);
use Apache::loncommon;
use Apache::lonnet;
use Apache::pre_xml;
use Apache::html_to_xml;
use Apache::post_xml;


sub handler {
    my $request = shift;
    my $uri = $request->uri;
    $uri =~ s/^\/daxeopen//;
    &Apache::loncommon::no_cache($request);
    if ($uri =~ /\/$/) {
        return directory_listing($uri, $request);
    } elsif ($uri =~ /^\/priv\/.*\.(task|problem|exam|quiz|assess|survey|library|xml|html|htm|xhtml|xhtm)$/) {
        return convert_problem($uri, $request);
    } else {
        # Apache should send other files directly
        $request->status(406);
        return OK;
    }
}

sub convert_problem {
    my ($uri, $request) = @_;
    
    if ($uri =~ /^\/priv\/([^\/]+)\/([^\/]+)\//) {
        my ($domain, $user) = ($1, $2);
        my ($uname, $udom) = ($env{'user.name'}, $env{'user.domain'});
        if (!defined $uname || !defined $udom || $domain ne $udom || $user ne $uname) {
            $request->content_type('text/plain');
            $request->print("Forbidden URI: $uri");
            $request->status(403);
            return OK;
        }
    }
    my $file = &Apache::lonnet::filelocation('', $uri);
    &Apache::lonnet::repcopy($file);
    if (! -e $file) {
        $request->status(404);
        return OK;
    }
    try {
        my $warnings = 0; # no warning printed
        my $textref = &Apache::pre_xml::pre_xml($file, $warnings);
        my $case_sensitive;
        if ($uri =~ /\.(task)$/) {
          $case_sensitive = 1;
        } else {
          $case_sensitive = 0;
        }
        $textref = &Apache::html_to_xml::html_to_xml($textref, $warnings, $case_sensitive);
        my $text = &Apache::post_xml::post_xml($textref, $file, $perlvar{'lonDocRoot'}, $warnings);
        &Apache::loncommon::content_type($request, 'text/xml', 'utf-8');
        $request->print($text);
        return OK;
    } catch {
        $request->content_type('text/plain');
        $request->print("convert failed for $file: $_");
        $request->status(406);
        return OK;
    };
}

sub directory_listing {
    my ($uri, $request) = @_;
    my $res = '<?xml version="1.0" encoding="UTF-8"?>'."\n";
    if ($uri eq '/') {
        # root: let users browse /res
        $res .= "<directory name=\"/\">\n";
        $res .= "<directory name=\"priv\"/>\n";
        $res .= "<directory name=\"res\"/>\n";
    } elsif ($uri !~ /^\/(priv|res)\//) {
        $request->content_type('text/plain');
        $request->print("Not found: $uri");
        $request->status(404);
        return OK;
    } elsif ($uri =~ /^\/res\//) {
        # NOTE: dirlist does not return an error for /res/idontexist/
	(my $listref, $listerror) = &Apache::lonnet::dirlist($uri);
	if ($listerror) {
            $request->content_type('text/plain');
            $request->print("listing error: $listerror");
            $request->status(406);
            return OK;
	} elsif ($uri =~ /^\/res\/[^\/]+\/$/ && scalar(@{$listref}) == 0) {
            $request->content_type('text/plain');
            $request->print("Not found: $uri");
            $request->status(404);
            return OK;
	}
        my $dirname = $uri;
        $dirname =~ s/^.*\/([^\/]*)$/$1/;
        $res .= "<directory name=\"$dirname/\">\n";
        if (ref($listref) eq 'ARRAY') {
            my @lines = @{$listref};
            foreach my $line (@lines) {
                my ($path, $dom, undef, $testdir, undef, undef, undef, undef, $size, undef, $mtime, undef, undef, undef, $obs, undef) = split(/\&/, $line, 16);
                my $isdir = ($testdir & 16384) || $dom =~ /^(user|domain)$/;
                $path =~ s/^\/home\/httpd\/html\/res\///;
                next if $path eq '.' || $path eq '..';
                next if $path =~ /\.meta$/ || $obs || $path =~ /\.\d+\.[^.]+$/;
                if ($dom ne 'domain') {
                    my ($udom,$uname);
                    if ($dom eq 'user') {
                        ($udom) = ($uri =~ m{^/res/($match_domain)});
                        $uname = $path;
                    } else {
                        ($udom, $uname) = ($uri =~ m{^/res/($match_domain)/($match_courseid)});
                    }
                    if ($udom ne '' && $uname ne '') {
                        # remove courses from the list
                        next if (&Apache::lonnet::is_course($udom, $uname));
                    }
                }
                $path =~ s/\/$//;
                my $name = $path;
                if ($isdir) {
                    $res .= "<directory name=\"$name\"/>\n";
                } else {
                    my $dt = DateTime->from_epoch(epoch => $mtime);
                    my $modified = $dt->iso8601().'Z';
                    $res .= "<file name=\"$name\" size=\"$size\" modified=\"$modified\"/>\n";
                }
            }
        }
    } elsif ($uri eq '/priv/') {
        my $udom = $env{'user.domain'};
        if (!defined $udom) {
            $request->content_type('text/plain');
            $request->print("Forbidden URI: $uri");
            $request->status(403);
            return OK;
        }
        $res .= "<directory name=\"priv\">\n";
        $res .= "<directory name=\"$udom\"/>\n";
    } elsif ($uri =~ /^\/priv\/([^\/]+)\/$/) {
        my $domain = $1;
        my ($uname, $udom) = ($env{'user.name'}, $env{'user.domain'});
        if (!defined $uname || !defined $udom || $domain ne $udom) {
            $request->content_type('text/plain');
            $request->print("Forbidden URI: $uri");
            $request->status(403);
            return OK;
        }
        $res .= "<directory name=\"$domain\">\n";
        $res .= "<directory name=\"$uname\"/>\n";
    } elsif ($uri =~ /^\/priv\/([^\/]+)\/([^\/]+)\//) {
        my ($domain, $user) = ($1, $2);
        my ($uname, $udom) = ($env{'user.name'}, $env{'user.domain'});
        if (!defined $uname || !defined $udom || $domain ne $udom || $user ne $uname) {
            $request->content_type('text/plain');
            $request->print("Forbidden URI: $uri");
            $request->status(403);
            return OK;
        }
        my $dirpath = &Apache::lonnet::filelocation('', $uri);
        if (! -e $dirpath) {
            $request->content_type('text/plain');
            $request->print("Not found: $uri");
            $request->status(404);
            return OK;
        }
        $dirpath =~ s/\/$//;
        opendir my $dir, $dirpath or die "Cannot open directory: $dirpath";
        my @files = readdir $dir;
        closedir $dir;
        my $dirname = $dirpath;
        $dirname =~ s/^.*\/([^\/]*)$/$1/;
        $res .= "<directory name=\"$dirname\">\n";
        foreach my $name (@files) {
            if ($name eq '.' || $name eq '..') {
                next;
            }
            if ($name =~ /\.(bak|log|meta|save)$/) {
                next;
            }
            $sb = stat($dirpath.'/'.$name);
            my $mode = $sb->mode;
            if (S_ISDIR($mode)) {
                $res .= "<directory name=\"$name\"/>\n";
            } else {
                $res .= "<file name=\"$name\"";
                my $size = $sb->size; # total size of file, in bytes
                $res .= " size=\"$size\"";
                my $mtime = $sb->mtime; # last modify time in seconds since the epoch
                my $dt = DateTime->from_epoch(epoch => $mtime);
                my $modified = $dt->iso8601().'Z';
                $res .= " modified=\"$modified\"";
                $res .= "/>\n";
            }
        }
    } else {
        $request->content_type('text/plain');
        $request->print("Not found: $uri");
        $request->status(404);
        return OK;
    }
    $res .= "</directory>\n";
    &Apache::loncommon::content_type($request, 'text/xml', 'utf-8');
    $request->print($res);
    return OK;
}

1;
__END__

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