provider.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/>.
/**
 * @package   mod_pdfannotator
 * @category  backup
 * @copyright 2018 RWTH Aachen (see README.md)
 * @author    Anna Heynkes
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_pdfannotator\privacy;

defined('MOODLE_INTERNAL') || die();

use \core_privacy\local\request\approved_contextlist;
use \core_privacy\local\request\deletion_criteria;
use \core_privacy\local\request\writer;
use \core_privacy\local\request\helper as request_helper;
use \core_privacy\local\metadata\collection;
use \core_privacy\local\request\transform;

/**
 * Description of provider
 *
 * @author Admin
 */
class provider implements \core_privacy\local\metadata\provider, \core_privacy\local\request\plugin\provider {

    /**
     * This function implements the \core_privacy\local\metadata\provider interface.
     *
     * It describes what kind of data is stored by the pdfannotator, including:
     *
     * 1. Items stored in a Moodle subsystem - for example files, and ratings
     * 2. Items stored in the Moodle database
     * 3. User preferences stored site-wide within Moodle for the pdfannotator
     * 4. Data being exported to an external location
     *
     * @param collection $collection
     * @return collection
     */
    public static function get_metadata(collection $collection): collection {

        // 1. Indicating that you store content in a Moodle subsystem.
        // 1.1 Files uploaded by users are saved.
        $collection->add_subsystem_link(
                'core_files', [], 'privacy:metadata:core_files'
        );

        // 2. Describing data stored in database tables.
        // 2.1 A user's annotations in the pdf are stored.
        $collection->add_database_table(
                'pdfannotator_annotations', [
            'userid' => 'privacy:metadata:pdfannotator_annotations:userid',
            'id' => 'privacy:metadata:pdfannotator_annotations:annotationid',
                ], 'privacy:metadata:pdfannotator_annotations'
        );