files_form.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/>.

/**
 * Upload files to content bank form
 *
 * @package    core_contentbank
 * @copyright  2020 Amaia Anabitarte <amaia@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

require_once("$CFG->libdir/formslib.php");

/**
 * Class contentbank_files_form
 *
 * @package    core_contentbank
 * @copyright  2020 Amaia Anabitarte <amaia@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class contentbank_files_form extends moodleform {

    /**
     * Add elements to this form.
     */
    public function definition() {
        $mform = $this->_form;

        $mform->addElement('hidden', 'contextid', $this->_customdata['contextid']);
        $mform->setType('contextid', PARAM_INT);

        $options = $this->_customdata['options'];
        $mform->addElement('filepicker', 'file', get_string('file', 'core_contentbank'), null, $options);
        $mform->addHelpButton('file', 'file', 'core_contentbank');
        $mform->addRule('file', null, 'required');

        $this->add_action_buttons(true, get_string('savechanges'));

        $data = $this->_customdata['data'];
        $this->set_data($data);
    }

    /**
     * Validate incoming data.
     *
     * @param array $data
     * @param array $files
     * @return array
     */
    public function validation($data, $files) {
        $errors = array();
        $draftitemid = $data['file'];
        if (file_is_draft_area_limit_reached($draftitemid, $this->_customdata['options']['areamaxbytes'])) {
            $errors['file'] = get_string('userquotalimit', 'error');
        }
        return $errors;
    }
}