lib.php

<?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/>.

/**
 * Lib functions..
 *
 * @package    tool_pdfpages
 * @author     Tom Dickman <tomdickman@catalyst-au.net>
 * @copyright  2021 Catalyst IT
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

/**
 * Serve a tool_pdfpages plugin file.
 *
 * @param object $course the course object
 * @param object $cm the course module object
 * @param object $context the context
 * @param string $filearea the name of the file area
 * @param array $args extra arguments [itemid, filepath, filename]
 * @param bool $forcedownload whether or not force download
 * @param array $options additional options affecting the file serving
 *
 * @return bool false if the file not found, just send the file otherwise and do not return anything.
 */
function tool_pdfpages_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload = false, array $options = []) {
    if ($filearea !== 'pdf') {
        return false;
    }

    $itemid = array_shift($args);
    $filename = array_pop($args);
    $filepath = empty($args) ? '/' : '/' . implode('/', $args) . '/';

    $fs = get_file_storage();
    $file = $fs->get_file($context->id, 'tool_pdfpages', $filearea, $itemid, $filepath, $filename);
    if (empty($file)) {
        return false; // The file does not exist.
    }

    send_stored_file($file, 86400, 0, $forcedownload, $options);
}