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<?php

/**

 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('Security', 'Utility');

App::uses('Hash', 'Utility');

App::uses('CakeEventListener', 'Event');

/**

 * Base Authentication class with common methods and properties.

 *

 * @package       Cake.Controller.Component.Auth

 */

abstract class BaseAuthenticate implements CakeEventListener {

/**

 * Settings for this object.

 *

 * - `fields` The fields to use to identify a user by.

 * - `userModel` The model name of the User, defaults to User.

 * - `userFields` Array of fields to retrieve from User model, null to retrieve all. Defaults to null.

 * - `scope` Additional conditions to use when looking up and authenticating users,

 *    i.e. `array('User.is_active' => 1).`

 * - `recursive` The value of the recursive key passed to find(). Defaults to 0.

 * - `contain` Extra models to contain and store in session.

 * - `passwordHasher` Password hasher class. Can be a string specifying class name

 *    or an array containing `className` key, any other keys will be passed as

 *    settings to the class. Defaults to 'Simple'.

 *

 * @var array

 */

	public $settings = array(

		'fields' => array(

			'username' => 'username',

			'password' => 'password'

		),

		'userModel' => 'User',

		'userFields' => null,

		'scope' => array(),

		'recursive' => 0,

		'contain' => null,

		'passwordHasher' => 'Simple'

	);

/**

 * A Component collection, used to get more components.

 *

 * @var ComponentCollection

 */

	protected $_Collection;

/**

 * Password hasher instance.

 *

 * @var AbstractPasswordHasher

 */

	protected $_passwordHasher;

/**

 * Implemented events

 *

 * @return array of events => callbacks.

 */

	public function implementedEvents() {

		return array();

	}

/**

 * Constructor

 *

 * @param ComponentCollection $collection The Component collection used on this request.

 * @param array $settings Array of settings to use.

 */

	public function __construct(ComponentCollection $collection, $settings) {

		$this->_Collection = $collection;

		$this->settings = Hash::merge($this->settings, $settings);

	}

/**

 * Find a user record using the standard options.

 *

 * The $username parameter can be a (string)username or an array containing

 * conditions for Model::find('first'). If the $password param is not provided

 * the password field will be present in returned array.

 *

 * Input passwords will be hashed even when a user doesn't exist. This

 * helps mitigate timing attacks that are attempting to find valid usernames.

 *

 * @param string|array $username The username/identifier, or an array of find conditions.

 * @param string $password The password, only used if $username param is string.

 * @return bool|array Either false on failure, or an array of user data.

 */

	protected function _findUser($username, $password = null) {

		$userModel = $this->settings['userModel'];

		list(, $model) = pluginSplit($userModel);

		$fields = $this->settings['fields'];

		if (is_array($username)) {

			$conditions = $username;

		} else {

			$conditions = array(

				$model . '.' . $fields['username'] => $username

			);

		}

		if (!empty($this->settings['scope'])) {

			$conditions = array_merge($conditions, $this->settings['scope']);

		}

		$userFields = $this->settings['userFields'];

		if ($password !== null && $userFields !== null) {

			$userFields[] = $model . '.' . $fields['password'];

		}

		$result = ClassRegistry::init($userModel)->find('first', array(

			'conditions' => $conditions,

			'recursive' => $this->settings['recursive'],

			'fields' => $userFields,

			'contain' => $this->settings['contain'],

		));

		if (empty($result[$model])) {

			$this->passwordHasher()->hash($password);

			return false;

		}

		$user = $result[$model];

		if ($password !== null) {

			if (!$this->passwordHasher()->check($password, $user[$fields['password']])) {

				return false;

			}

			unset($user[$fields['password']]);

		}

		unset($result[$model]);

		return array_merge($user, $result);

	}

/**

 * Return password hasher object

 *

 * @return AbstractPasswordHasher Password hasher instance

 * @throws CakeException If password hasher class not found or

 *   it does not extend AbstractPasswordHasher

 */

	public function passwordHasher() {

		if ($this->_passwordHasher) {

			return $this->_passwordHasher;

		}

		$config = array();

		if (is_string($this->settings['passwordHasher'])) {

			$class = $this->settings['passwordHasher'];

		} else {

			$class = $this->settings['passwordHasher']['className'];

			$config = $this->settings['passwordHasher'];

			unset($config['className']);

		}

		list($plugin, $class) = pluginSplit($class, true);

		$className = $class . 'PasswordHasher';

		App::uses($className, $plugin . 'Controller/Component/Auth');

		if (!class_exists($className)) {

			throw new CakeException(__d('cake_dev', 'Password hasher class "%s" was not found.', $class));

		}

		if (!is_subclass_of($className, 'AbstractPasswordHasher')) {

			throw new CakeException(__d('cake_dev', 'Password hasher must extend AbstractPasswordHasher class.'));

		}

		$this->_passwordHasher = new $className($config);

		return $this->_passwordHasher;

	}

/**

 * Hash the plain text password so that it matches the hashed/encrypted password

 * in the datasource.

 *

 * @param string $password The plain text password.

 * @return string The hashed form of the password.

 * @deprecated 3.0.0 Since 2.4. Use a PasswordHasher class instead.

 */

	protected function _password($password) {

		return Security::hash($password, null, true);

	}

/**

 * Authenticate a user based on the request information.

 *

 * @param CakeRequest $request Request to get authentication information from.

 * @param CakeResponse $response A response object that can have headers added.

 * @return mixed Either false on failure, or an array of user data on success.

 */

	abstract public function authenticate(CakeRequest $request, CakeResponse $response);

/**

 * Allows you to hook into AuthComponent::logout(),

 * and implement specialized logout behavior.

 *

 * All attached authentication objects will have this method

 * called when a user logs out.

 *

 * @param array $user The user about to be logged out.

 * @return void

 */

	public function logout($user) {

	}

/**

 * Get a user based on information in the request. Primarily used by stateless authentication

 * systems like basic and digest auth.

 *

 * @param CakeRequest $request Request object.

 * @return mixed Either false or an array of user information

 */

	public function getUser(CakeRequest $request) {

		return false;

	}

/**

 * Handle unauthenticated access attempt.

 *

 * @param CakeRequest $request A request object.

 * @param CakeResponse $response A response object.

 * @return mixed Either true to indicate the unauthenticated request has been

 *  dealt with and no more action is required by AuthComponent or void (default).

 */

	public function unauthenticated(CakeRequest $request, CakeResponse $response) {

	}

}