<?php

App::uses('AbstractPasswordHasher', 'Controller/Component/Auth');
App::uses('PasswordHasherFactory', 'Tools.Controller/Component/Auth');
/**
 * A backport of the 3.x FallbackPasswordHasher class.
 *
 * @author Mark Scherer
 * @license http://opensource.org/licenses/mit-license.php MIT
 */
class FallbackPasswordHasher extends AbstractPasswordHasher {

	/**
	 * Default config for this object.
	 *
	 * @var array
	 */
	protected $_defaultConfig = ['hashers' => []];

	/**
	 * Holds the list of password hasher objects that will be used
	 *
	 * @var array
	 */
	protected $_hashers = [];

	/**
	 * Constructor
	 *
	 * @param array $config configuration options for this object. Requires the
	 * `hashers` key to be present in the array with a list of other hashers to be
	 * used
	 */
	public function __construct(array $config = []) {
		$config += $this->_defaultConfig;
		parent::__construct($config);
		foreach ($this->_config['hashers'] as $key => $hasher) {
			if (!is_string($hasher)) {
				$hasher += ['className' => $key, ];
			}
			$this->_hashers[] = PasswordHasherFactory::build($hasher);
		}
	}

	/**
	 * Generates password hash.
	 *
	 * Uses the first password hasher in the list to generate the hash
	 *
	 * @param string $password Plain text password to hash.
	 * @return string Password hash
	 */
	public function hash($password) {
		return $this->_hashers[0]->hash($password);
	}

	/**
	 * Verifies that the provided password corresponds to its hashed version
	 *
	 * This will iterate over all configured hashers until one of them returns
	 * true.
	 *
	 * @param string $password Plain text password to hash.
	 * @param string $hashedPassword Existing hashed password.
	 * @return bool True if hashes match else false.
	 */
	public function check($password, $hashedPassword) {
		foreach ($this->_hashers as $hasher) {
			if ($hasher->check($password, $hashedPassword)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Returns true if the password need to be rehashed, with the first hasher present
	 * in the list of hashers
	 *
	 * @param string $password The password to verify
	 * @return bool
	 */
	public function needsRehash($password) {
		return $this->_hashers[0]->needsRehash($password);
	}

}