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lib.php
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lib.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Callbacks.
*
* @package core_h5p
* @copyright 2019 Bas Brands <[email protected]>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
use core_h5p\local\library\autoloader;
/**
* Serve the files from the core_h5p file areas.
*
* @package core_h5p
* @category files
*
* @param stdClass $course the course object
* @param stdClass $cm the course module object
* @param stdClass $context the newmodule's context
* @param string $filearea the name of the file area
* @param array $args extra arguments (itemid, path)
* @param bool $forcedownload whether or not force download
* @param array $options additional options affecting the file serving
*
* @return bool Returns false if we don't find a file.
*/
function core_h5p_pluginfile($course, $cm, $context, string $filearea, array $args, bool $forcedownload,
array $options = []) : bool {
global $DB;
// Require classes from H5P third party library
autoloader::register();
$filesettingsset = false;
switch ($filearea) {
default:
return false; // Invalid file area.
case \core_h5p\file_storage::LIBRARY_FILEAREA:
if ($context->contextlevel != CONTEXT_SYSTEM) {
return false; // Invalid context because the libraries are loaded always in the context system.
}
$itemid = null;
// The files that can be delivered to this function are unfortunately out of our control. Some of the
// references are embedded into the JavaScript of the files and we have no ability to inject an item id.
// We also don't know the location of the item id when we do include it, so we look for the first numeric
// value and try to serve that file.
foreach ($args as $key => $value) {
if (is_numeric($value)) {
$itemid = $value;
unset($args[$key]);
break;
}
}
if (!isset($itemid)) {
// We didn't find an item id to use, so we fall back to retrieving the record using all the other
// fields. The combination of component, filearea, filepath, and filename is enough for a unique
// record.
$filename = array_pop($args);
$filepath = '/' . implode('/', $args) . '/';
$itemid = $DB->get_field('files', 'itemid', [
'component' => \core_h5p\file_storage::COMPONENT,
'filearea' => \core_h5p\file_storage::LIBRARY_FILEAREA,
'filepath' => $filepath,
'filename' => $filename
]);
$filesettingsset = true;
}
break;
case \core_h5p\file_storage::CONTENT_FILEAREA:
if ($context->contextlevel != CONTEXT_SYSTEM) {
return false; // Invalid context because the content files are loaded always in the context system.
}
$itemid = array_shift($args);
break;
case \core_h5p\file_storage::CACHED_ASSETS_FILEAREA:
case \core_h5p\file_storage::EXPORT_FILEAREA:
$itemid = 0;
break;
}
if (!$filesettingsset) {
$filename = array_pop($args);
$filepath = (!$args ? '/' : '/' . implode('/', $args) . '/');
}
$fs = get_file_storage();
$file = $fs->get_file($context->id, \core_h5p\file_storage::COMPONENT, $filearea, $itemid, $filepath, $filename);
if (!$file) {
return false; // No such file.
}
send_stored_file($file, null, 0, $forcedownload, $options);
return true;
}