moodle-mod_htmlcert/classes/verify_certificate_form.php

<?php
// This file is part of the customcert module for 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/>.

/**
 * This files contains the form for verifying a certificate.
 *
 * @package    mod_customcert
 * @copyright  2017 Mark Nelson <markn@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_customcert;

defined('MOODLE_INTERNAL') || die('Direct access to this script is forbidden.');

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

/**
 * The form for verifying a certificate.
 *
 * @package    mod_customcert
 * @copyright  2017 Mark Nelson <markn@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class verify_certificate_form extends \moodleform {

    /**
     * Form definition.
     */
    public function definition() {
        $mform =& $this->_form;

        $mform->addElement('text', 'code', get_string('code', 'customcert'));
        $mform->setType('code', PARAM_ALPHANUM);

        $mform->addElement('submit', 'verify', get_string('verify', 'customcert'));
    }

    /**
     * Validation.
     *
     * @param array $data
     * @param array $files
     * @return array the errors that were found
     */
    public function validation($data, $files) {
        $errors = array();

        if ($data['code'] === '') {
            $errors['code'] = get_string('invalidcode', 'customcert');
        }

        return $errors;
    }
}