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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2018, Roeland Jago Douma <roeland@famdouma.nl>
*
* @author Roeland Jago Douma <roeland@famdouma.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\Password_Policy;
use OC\HintException;
use OCP\Security\ISecureRandom;
class Generator {
/** @var PasswordPolicyConfig */
private $config;
/** @var PasswordValidator */
private $validator;
/** @var ISecureRandom */
private $random;
public function __construct(PasswordPolicyConfig $config,
PasswordValidator $validator,
ISecureRandom $random) {
$this->config = $config;
$this->validator = $validator;
$this->random = $random;
}
/**
* @return string
* @throws HintException
*/
public function generate(): string {
$minLength = max($this->config->getMinLength(), 8);
$length = $minLength;
$password = '';
$chars = '';
$found = false;
for ($i = 0; $i < 10; $i++) {
if ($this->config->getEnforceUpperLowerCase()) {
$password .= $this->random->generate(1, ISecureRandom::CHAR_UPPER);
$password .= $this->random->generate(1, ISecureRandom::CHAR_LOWER);
$length -= 2;
$chars .= ISecureRandom::CHAR_UPPER . ISecureRandom::CHAR_LOWER;
}
if ($this->config->getEnforceNumericCharacters()) {
$password .= $this->random->generate(1, ISecureRandom::CHAR_DIGITS);
$length -= 1;
$chars .= ISecureRandom::CHAR_DIGITS;
}
if ($this->config->getEnforceSpecialCharacters()) {
$password .= $this->random->generate(1, ISecureRandom::CHAR_SYMBOLS);
$length -= 1;
$chars .= ISecureRandom::CHAR_SYMBOLS;
}
if ($chars === '') {
$chars = ISecureRandom::CHAR_HUMAN_READABLE;
}
$password .= $chars = $this->random->generate($length, $chars);
// Shuffle string so the order is random
$password = str_shuffle($password);
try {
$this->validator->validate($password);
if ($password === null || $password === '') {
// something went wrong
break;
}
$found = true;
break;
} catch (HintException $e) {
/*
* Invalid so lets go for another round
* Reset the length so we don't run below zero
*/
$length = $minLength;
}
}
if ($found === false) {
throw new HintException('Could not generate a valid password');
}
return $password;
}
}
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