# The LearningOnline Network
# Opening converted problems and directory listings for Daxe
#
# $Id: daxeopen.pm,v 1.13 2023/08/28 18:58:44 raeburn 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 strict;
use Apache::Constants qw(:common);
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;
use Apache::lonlocal;
sub handler {
my $request = shift;
my $uri = $request->uri;
$uri =~ s{^/daxeopen}{};
&Apache::loncommon::no_cache($request);
if ($uri =~ m{/$}) {
return directory_listing($uri, $request);
} elsif ($uri =~ m{^/priv/.*\.(task|problem|exam|quiz|assess|survey|library|xml|html|htm|xhtml|xhtm)$}) {
return convert_problem($uri, $request);
} elsif ($uri =~ m{^/uploaded/$match_domain/$match_courseid/(docs|supplemental)/(default|\d+)/\d+/.*\.(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 =~ m{^/priv/$match_domain/$match_username/}) {
unless (&has_priv_access($uri)) {
$request->content_type('text/plain');
$request->print(&mt('Forbidden URI: [_1]',$uri));
$request->status(403);
return OK;
}
} elsif ($uri =~ m{^/uploaded/($match_domain)/($match_courseid)/}) {
my ($posscdom,$posscnum) = ($1,$2);
my $allowed;
if ($env{'request.course.id'}) {
my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
if (($posscdom eq $cdom) && ($posscnum eq $cnum)) {
if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
$allowed = 1;
}
}
}
unless ($allowed) {
$request->content_type('text/plain');
$request->print(&mt('Forbidden URI: [_1]',$uri));
$request->status(403);
return OK;
}
}
my $file = &Apache::lonnet::filelocation('', $uri);
if (&Apache::lonnet::repcopy($file) eq 'ok') {
if (! -e $file) {
$request->print(&mt('Not found: [_1]',$uri));
$request->status(404);
return OK;
}
} else {
$request->print(&mt('Forbidden URI: [_1]',$uri));
$request->status(403);
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, $Apache::lonnet::perlvar{'lonDocRoot'}, $warnings);
&Apache::loncommon::content_type($request, 'text/xml', 'utf-8');
$request->print($text);
return OK;
} catch {
$request->content_type('text/plain');
$request->print(&mt('convert failed for [_1]:',$file)." $_");
$request->status(406);
return OK;
};
}
sub directory_listing {
my ($uri, $request) = @_;
my $res = '<?xml version="1.0" encoding="UTF-8"?>'."\n";
my $referrer = $request->headers_in->{'Referer'};
my ($cdom,$cnum);
if ($env{'request.course.id'}) {
$cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
$cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
}
if ($uri eq '/') {
$res .= "<directory name=\"/\">\n";
if (($env{'request.course.id'}) &&
($referrer =~ m{\Qfile=/daxeopen/uploaded/$cdom/$cnum/\E(docs|supplemental)/(default|\d+)/(\d+)/})) {
$res .= "<directory name=\"uploaded\"/>\n";
} else {
# root: let users browse /res
$res .= "<directory name=\"priv\"/>\n";
$res .= "<directory name=\"res\"/>\n";
}
} elsif ($uri =~ m{^/uploaded/(.*)$}) {
my $rem = $1;
$rem =~ s{/$}{};
if (($env{'request.course.id'}) &&
($referrer =~ m{\Qfile=/daxeopen/uploaded/$cdom/$cnum/\E(docs|supplemental)/(default|\d+)/(\d+)/})) {
my ($type,$folder,$rid) = ($1,$2,$3);
if ($rem eq '') {
$res .= "<directory name=\"uploaded\">\n";
$res .= "<directory name=\"$cdom\"/>\n";
} else {
my @expected = ($cdom,$cnum,$type,$folder,$rid);
my @rest = split(/\//,$rem);
my $valid = 1;
for (my $i=0; $i<@rest; $i++) {
unless ($rest[$i] eq $expected[$i]) {
$valid = 0;
last;
}
}
if ($valid) {
my $dirname = $rest[-1];
$res .= "<directory name=\"$dirname\">\n";
if (scalar(@rest) == scalar(@expected)) {
my $subdir = "/userfiles/$type/$folder/$rid";
my ($listref, $listerror) = &Apache::lonnet::dirlist($subdir,$cdom,$cnum,'',1);
if ($listerror) {
$request->content_type('text/plain');
$request->print(&mt('listing error: [_1]',$listerror));
$request->status(406);
return OK;
} elsif (scalar(@{$listref}) == 0) {
$request->content_type('text/plain');
$request->print(&mt('Not found: [_1]',$uri));
$request->status(404);
return OK;
} else {
my @lines = @{$listref};
my $dirpath = &LONCAPA::propath($cdom,$cnum).'/userfiles';
my $dirname = $uri;
$dirname =~ s{^.*/([^/]*)$}{$1};
foreach my $line (@lines) {
my ($path,$dom,undef,$testdir,undef,undef,undef,undef,$size,undef,$mtime) = split(/\&/,$line,12);
my $isdir = ($testdir & 16384);
$path =~ s{^$dirpath}{};
next if ($path eq '.' || $path eq '..');
$path =~ s{/$}{};
my $name = $path;
if ($isdir) {
$res .= "<directory name=\"$name\"/>\n";
} else {
next if ($name =~ /\.bak$/);
my $dt = DateTime->from_epoch(epoch => $mtime);
my $modified = $dt->iso8601().'Z';
$res .= "<file name=\"$name\" size=\"$size\" modified=\"$modified\"/>\n";
}
}
}
} else {
my $nextidx = scalar(@rest);
my $subdir = $expected[$nextidx];
$res .= "<directory name=\"$subdir\"/>"."\n";
}
} else {
$request->content_type('text/plain');
$request->print(&mt('Forbidden URI: [_1]',$uri));
$request->status(403);
return OK;
}
}
} else {
$request->content_type('text/plain');
$request->print(&mt('Forbidden URI: [_1]',$uri));
$request->status(403);
return OK;
}
} elsif ($uri !~ m{^/(priv|res)/}) {
$request->content_type('text/plain');
$request->print(&mt('Not found: [_1]',$uri));
$request->status(404);
return OK;
} elsif ($uri =~ m{^/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');
$request->print(&mt('listing error: [_1]',$listerror));
$request->status(406);
return OK;
} elsif ($uri =~ m{^/res/[^/]+/$} && scalar(@{$listref}) == 0) {
$request->content_type('text/plain');
$request->print(&mt('Not found: [_1]',$uri));
$request->status(404);
return OK;
}
my $dirname = $uri;
$dirname =~ s{^.*/([^/]*)$}{$1};
$res .= "<directory name=\"$dirname/\">\n";
my (%is_course,%is_courseauthor);
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 '') {
my $key = $udom.':'.$uname;
if (exists($is_course{$key})) {
if ($is_course{$key}) {
next unless ($is_courseauthor{$key});
}
} else {
if (&Apache::lonnet::is_course($udom, $uname)) {
$is_course{$key} = 1;
if ($env{'request.course.id'}) {
my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
if (($cdom eq $udom) && ($cnum eq $uname)) {
if (&Apache::lonnet::allowed('mdc', $env{'request.course.id'})) {
$is_courseauthor{$key} = 1;
}
}
}
# remove courses from the list
next unless ($is_courseauthor{$key});
} else {
$is_course{$key} = 0;
}
}
}
}
$path =~ s{/$}{};
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 $defdom = &get_defdom($referrer);
if (!defined $defdom) {
$request->content_type('text/plain');
$request->print(&mt('Forbidden URI: [_1]',$uri));
$request->status(403);
return OK;
}
$res .= "<directory name=\"priv\">\n";
$res .= "<directory name=\"$defdom\"/>\n";
} elsif ($uri =~ m{^/priv/($match_domain)/$}) {
my $domain = $1;
my $defdom = &get_defdom($referrer);
if ($domain ne $defdom) {
$request->content_type('text/plain');
$request->print(&mt('Forbidden URI: [_1]',$uri));
$request->status(403);
return OK;
}
my $defname = &get_defname($domain,$referrer);
$res .= "<directory name=\"$domain\">\n";
$res .= "<directory name=\"$defname\"/>\n";
} elsif ($uri =~ m{^/priv/($match_domain)\/($match_username)/}) {
unless (&has_priv_access($uri)) {
$request->content_type('text/plain');
$request->print(&mt('Forbidden URI: [_1]',$uri));
$request->status(403);
return OK;
}
my $dirpath = &Apache::lonnet::filelocation('', $uri);
if (! -e $dirpath) {
$request->content_type('text/plain');
$request->print(&mt('Not found: [_1]',$uri));
$request->status(404);
return OK;
}
$dirpath =~ s{/$}{};
my @files;
if (opendir(my $dir, $dirpath)) {
@files = readdir($dir);
closedir($dir);
} else {
$request->content_type('text/plain');
$request->print(&mt('Error opening directory: [_1]',$dirpath));
$request->status(403);
return OK;
}
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;
}
my $sb = stat($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');
$request->print(&mt('Not found: [_1]',$uri));
$request->status(404);
return OK;
}
$res .= "</directory>\n";
&Apache::loncommon::content_type($request, 'text/xml', 'utf-8');
$request->print($res);
return OK;
}
sub has_priv_access {
my ($uri) = @_;
my ($ownername,$ownerdom,$ownerhome) =
&Apache::lonnet::constructaccess($uri);
my $allowed;
if (($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;
}
}
}
return $allowed;
}
sub get_defdom {
my ($referrer) = @_;
my $defdom;
if ($env{'request.role'} =~ m{^au\./($match_domain)/$}) {
$defdom = $1;
} elsif ($env{'request.role'} =~ m{^(?:ca|aa)\.($match_domain)/($match_username)$}) {
$defdom = $1;
} elsif ($env{'request.course.id'}) {
if ($referrer =~ m{\Qfile=/daxeopen/priv/\E($match_domain)/($match_username)/}) {
my ($possdom,$possuname) = ($1,$2);
if (&Apache::lonnet::is_course($possdom,$possuname)) {
my $crsurl = &Apache::lonnet::courseid_to_courseurl($env{'request.course.id'});
if ($crsurl eq "/$possdom/$possuname") {
$defdom = $possdom;
}
} else {
if (&Apache::lonnet::domain($possdom) ne '') {
$defdom = $possdom;
}
}
}
}
if ($defdom eq '') {
my ($is_adv,$is_author) = &Apache::lonnet::is_advanced_user($env{'user.domain'},$env{'user.name'});
if ($is_author) {
$defdom = $env{'user.domain'};
}
}
return $defdom;
}
sub get_defname {
my ($domain,$referrer) = @_;
my $defname;
if ($env{'request.role'} eq "au./$domain/") {
$defname = $env{'user.name'};
} elsif ($env{'request.role'} =~ m{^(?:ca|aa)\./\Q$domain\E/($match_username)$}) {
$defname = $1;
} elsif ($env{'request.course.id'}) {
if ($referrer =~ m{\Qfile=/daxeopen/priv/\E($match_domain)/($match_username)/}) {
my ($possdom,$possuname) = ($1,$2);
if ($domain eq $possdom) {
if (&Apache::lonnet::is_course($possdom,$possuname)) {
my $crsurl = &Apache::lonnet::courseid_to_courseurl($env{'request.course.id'});
if ($crsurl eq "/$possdom/$possuname") {
$defname = $possuname;
}
} else {
unless (&Apache::lonnet::homeserver($possuname,$possdom) eq 'no_host') {
$defname = $possuname;
}
}
}
}
}
if ($defname eq '') {
my ($is_adv,$is_author) = &Apache::lonnet::is_advanced_user($domain,$env{'user.name'});
if ($is_author) {
$defname = $env{'user.name'};
}
}
return $defname;
}
1;
__END__
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