Add generator

This can generate password that pass the password policy

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

1 files changed, 96 insertions, 0 deletions

diff --git a/lib/Generator.php b/lib/Generator.php
new file mode 100644
index 0000000..1d4dd5a
--- /dev/null
+++ b/lib/Generator.php
@@ -0,0 +1,96 @@
+<?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;
+	}
+
+	public function generate(): string {
+
+		$lenght = $this->config->getMinLength();
+
+		$password = '';
+		$chars = '';
+
+		while (true) {
+			if ($this->config->getEnforceUpperLowerCase()) {
+				$password .= $this->random->generate(1, ISecureRandom::CHAR_UPPER);
+				$password .= $this->random->generate(1, ISecureRandom::CHAR_LOWER);
+				$lenght -= 2;
+				$chars .= ISecureRandom::CHAR_UPPER . ISecureRandom::CHAR_LOWER;
+			}
+
+			if ($this->config->getEnforceNumericCharacters()) {
+				$password .= $this->random->generate(1, ISecureRandom::CHAR_DIGITS);
+				$lenght -= 1;
+				$chars .= ISecureRandom::CHAR_DIGITS;
+			}
+
+			if ($this->config->getEnforceSpecialCharacters()) {
+				$password .= $this->random->generate(1, ISecureRandom::CHAR_SYMBOLS);
+				$lenght -= 1;
+				$chars .= ISecureRandom::CHAR_SYMBOLS;
+			}
+
+			if ($chars === '') {
+				$chars = ISecureRandom::CHAR_HUMAN_READABLE;
+			}
+
+			$password .= $chars = $this->random->generate($lenght, $chars);
+
+			try {
+				$this->validator->validate($password);
+				break;
+			} catch (HintException $e) {
+				/*
+				 * Invalid so lets go for another round
+				 * Reset the length so we don't run below zero
+				 */
+				$lenght = $this->config->getMinLength();
+			}
+		}
+
+		return $password;
+	}
+}