select_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/>.

/**
 * Group self selection interface
 *
 * @package   mod_groupselect
 * @copyright 2018 HTW Chur Roger Barras
 * @copyright 2008-2011 Petr Skoda (http://skodak.org)
 * @copyright 2014 Tampere University of Technology, P. Pyykkönen (pirkka.pyykkonen ÄT tut.fi)
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
defined( 'MOODLE_INTERNAL' ) || die();

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

/**
 * Groupselect select form.
 *
 * @copyright  2018 HTW Chur Roger Barras
 * @copyright  2008-2011 Petr Skoda (http://skodak.org)
 * @copyright  2014 Tampere University of Technology, P. Pyykkönen (pirkka.pyykkonen ÄT tut.fi)
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class select_form extends moodleform {
    /**
     * @var $groupselect The group select instance.
     */
    private $groupselect;

    /**
     * Definition of the form
     */
    public function definition() {
        $mform = $this->_form;

        list( $data, $this->groupselect, $grpname ) = $this->_customdata;

        if ($data['group_password']) {
            $mform->addElement( 'passwordunmask', 'password', get_string( 'password', 'mod_groupselect' ),
            'maxlength="254" size="24"' );
            $mform->setType( 'password', PARAM_RAW );
        }

        $mform->addElement( 'hidden', 'id' );
        $mform->setType( 'id', PARAM_INT );

        $mform->addElement( 'hidden', 'select' );
        $mform->setType( 'select', PARAM_INT );

        $mform->addElement( 'hidden', 'group_password' );
        $mform->setType( 'group_password', PARAM_BOOL );

        $this->add_action_buttons( true, get_string( 'select', 'mod_groupselect', $grpname ) );

        $this->set_data( $data );
    }

    /**
     * Validation of the form
     *
     * @param array $data
     * @param array $files
     * @return array
     */
    public function validation($data, $files) {

        $errors = parent::validation( $data, $files );

        if ($data['group_password']) {
            global $DB;
            $sql = "SELECT  g.password
                                  FROM    {groupselect_passwords} g
                                 WHERE   g.groupid = ?";
            $params = array (
                    'id' => $data['select']
            );
            $password = $DB->get_record_sql( $sql, $params )->password;

            if (! password_verify( $data['password'], $password )) {
                $errors['password'] = get_string( 'incorrectpassword', 'mod_groupselect' );
            }
        }
        return $errors;
    }
}