Proyectos de Subversion Moodle

<?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 <bas@moodle.com>

 * @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:

        case \core_h5p\file_storage::CSS_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;

}