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<?php

/**

 * Authentication component

 *

 * Manages user logins and permissions.

 *

 * 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

 * @package       Cake.Controller.Component

 * @since         CakePHP(tm) v 0.10.0.1076

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

 */

App::uses('Component', 'Controller');

App::uses('Router', 'Routing');

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

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

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

App::uses('CakeSession', 'Model/Datasource');

App::uses('BaseAuthorize', 'Controller/Component/Auth');

App::uses('BaseAuthenticate', 'Controller/Component/Auth');

/**

 * Authentication control component class

 *

 * Binds access control with user authentication and session management.

 *

 * @package       Cake.Controller.Component

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html

 */

class AuthComponent extends Component {

/**

 * Constant for 'all'

 *

 * @var string

 */

	const ALL = 'all';

/**

 * Other components utilized by AuthComponent

 *

 * @var array

 */

	public $components = array('Session', 'RequestHandler');

/**

 * An array of authentication objects to use for authenticating users. You can configure

 * multiple adapters and they will be checked sequentially when users are identified.

 *

 * {{{

 *	$this->Auth->authenticate = array(

 *		'Form' => array(

 *			'userModel' => 'Users.User'

 *		)

 *	);

 * }}}

 *

 * Using the class name without 'Authenticate' as the key, you can pass in an array of settings for each

 * authentication object. Additionally you can define settings that should be set to all authentications objects

 * using the 'all' key:

 *

 * {{{

 *	$this->Auth->authenticate = array(

 *		'all' => array(

 *			'userModel' => 'Users.User',

 *			'scope' => array('User.active' => 1)

 *		),

 *		'Form',

 *		'Basic'

 *	);

 * }}}

 *

 * You can also use AuthComponent::ALL instead of the string 'all'.

 *

 * @var array

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html

 */

	public $authenticate = array('Form');

/**

 * Objects that will be used for authentication checks.

 *

 * @var array

 */

	protected $_authenticateObjects = array();

/**

 * An array of authorization objects to use for authorizing users. You can configure

 * multiple adapters and they will be checked sequentially when authorization checks are done.

 *

 * {{{

 *	$this->Auth->authorize = array(

 *		'Crud' => array(

 *			'actionPath' => 'controllers/'

 *		)

 *	);

 * }}}

 *

 * Using the class name without 'Authorize' as the key, you can pass in an array of settings for each

 * authorization object. Additionally you can define settings that should be set to all authorization objects

 * using the 'all' key:

 *

 * {{{

 *	$this->Auth->authorize = array(

 *		'all' => array(

 *			'actionPath' => 'controllers/'

 *		),

 *		'Crud',

 *		'CustomAuth'

 *	);

 * }}}

 *

 * You can also use AuthComponent::ALL instead of the string 'all'

 *

 * @var mixed

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#authorization

 */

	public $authorize = false;

/**

 * Objects that will be used for authorization checks.

 *

 * @var array

 */

	protected $_authorizeObjects = array();

/**

 * The name of an optional view element to render when an Ajax request is made

 * with an invalid or expired session

 *

 * @var string

 */

	public $ajaxLogin = null;

/**

 * Settings to use when Auth needs to do a flash message with SessionComponent::setFlash().

 * Available keys are:

 *

 * - `element` - The element to use, defaults to 'default'.

 * - `key` - The key to use, defaults to 'auth'

 * - `params` - The array of additional params to use, defaults to array()

 *

 * @var array

 */

	public $flash = array(

		'element' => 'default',

		'key' => 'auth',

		'params' => array()

	);

/**

 * The session key name where the record of the current user is stored. Default

 * key is "Auth.User". If you are using only stateless authenticators set this

 * to false to ensure session is not started.

 *

 * @var string

 */

	public static $sessionKey = 'Auth.User';

/**

 * The current user, used for stateless authentication when

 * sessions are not available.

 *

 * @var array

 */

	protected static $_user = array();

/**

 * A URL (defined as a string or array) to the controller action that handles

 * logins. Defaults to `/users/login`.

 *

 * @var mixed

 */

	public $loginAction = array(

		'controller' => 'users',

		'action' => 'login',

		'plugin' => null

	);

/**

 * Normally, if a user is redirected to the $loginAction page, the location they

 * were redirected from will be stored in the session so that they can be

 * redirected back after a successful login. If this session value is not

 * set, redirectUrl() method will return the URL specified in $loginRedirect.

 *

 * @var mixed

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#AuthComponent::$loginRedirect

 */

	public $loginRedirect = null;

/**

 * The default action to redirect to after the user is logged out. While AuthComponent does

 * not handle post-logout redirection, a redirect URL will be returned from AuthComponent::logout().

 * Defaults to AuthComponent::$loginAction.

 *

 * @var mixed

 * @see AuthComponent::$loginAction

 * @see AuthComponent::logout()

 */

	public $logoutRedirect = null;

/**

 * Error to display when user attempts to access an object or action to which they do not have

 * access.

 *

 * @var string|bool

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#AuthComponent::$authError

 */

	public $authError = null;

/**

 * Controls handling of unauthorized access.

 * - For default value `true` unauthorized user is redirected to the referrer URL

 *   or AuthComponent::$loginRedirect or '/'.

 * - If set to a string or array the value is used as a URL to redirect to.

 * - If set to false a ForbiddenException exception is thrown instead of redirecting.

 *

 * @var mixed

 */

	public $unauthorizedRedirect = true;

/**

 * Controller actions for which user validation is not required.

 *

 * @var array

 * @see AuthComponent::allow()

 */

	public $allowedActions = array();

/**

 * Request object

 *

 * @var CakeRequest

 */

	public $request;

/**

 * Response object

 *

 * @var CakeResponse

 */

	public $response;

/**

 * Method list for bound controller.

 *

 * @var array

 */

	protected $_methods = array();

/**

 * Initializes AuthComponent for use in the controller.

 *

 * @param Controller $controller A reference to the instantiating controller object

 * @return void

 */

	public function initialize(Controller $controller) {

		$this->request = $controller->request;

		$this->response = $controller->response;

		$this->_methods = $controller->methods;

		if (Configure::read('debug') > 0) {

			Debugger::checkSecurityKeys();

		}

	}

/**

 * Main execution method. Handles redirecting of invalid users, and processing

 * of login form data.

 *

 * @param Controller $controller A reference to the instantiating controller object

 * @return bool

 */

	public function startup(Controller $controller) {

		$methods = array_flip(array_map('strtolower', $controller->methods));

		$action = strtolower($controller->request->params['action']);

		$isMissingAction = (

			$controller->scaffold === false &&

			!isset($methods[$action])

		);

		if ($isMissingAction) {

			return true;

		}

		if (!$this->_setDefaults()) {

			return false;

		}

		if ($this->_isAllowed($controller)) {

			return true;

		}

		if (!$this->_getUser()) {

			return $this->_unauthenticated($controller);

		}

		if ($this->_isLoginAction($controller) ||

			empty($this->authorize) ||

			$this->isAuthorized($this->user())

		) {

			return true;

		}

		return $this->_unauthorized($controller);

	}

/**

 * Checks whether current action is accessible without authentication.

 *

 * @param Controller $controller A reference to the instantiating controller object

 * @return bool True if action is accessible without authentication else false

 */

	protected function _isAllowed(Controller $controller) {

		$action = strtolower($controller->request->params['action']);

		if (in_array($action, array_map('strtolower', $this->allowedActions))) {

			return true;

		}

		return false;

	}

/**

 * Handles unauthenticated access attempt. First the `unathenticated()` method

 * of the last authenticator in the chain will be called. The authenticator can

 * handle sending response or redirection as appropriate and return `true` to

 * indicate no furthur action is necessary. If authenticator returns null this

 * method redirects user to login action. If it's an ajax request and

 * $ajaxLogin is specified that element is rendered else a 403 http status code

 * is returned.

 *

 * @param Controller $controller A reference to the controller object.

 * @return bool True if current action is login action else false.

 */

	protected function _unauthenticated(Controller $controller) {

		if (empty($this->_authenticateObjects)) {

			$this->constructAuthenticate();

		}

		$auth = $this->_authenticateObjects[count($this->_authenticateObjects) - 1];

		if ($auth->unauthenticated($this->request, $this->response)) {

			return false;

		}

		if ($this->_isLoginAction($controller)) {

			if (empty($controller->request->data)) {

				if (!$this->Session->check('Auth.redirect') && env('HTTP_REFERER')) {

					$this->Session->write('Auth.redirect', $controller->referer(null, true));

				}

			}

			return true;

		}

		if (!$controller->request->is('ajax')) {

			$this->flash($this->authError);

			$this->Session->write('Auth.redirect', $controller->request->here(false));

			$controller->redirect($this->loginAction);

			return false;

		}

		if (!empty($this->ajaxLogin)) {

			$controller->response->statusCode(403);

			$controller->viewPath = 'Elements';

			echo $controller->render($this->ajaxLogin, $this->RequestHandler->ajaxLayout);

			$this->_stop();

			return false;

		}

		$controller->redirect(null, 403);

		return false;

	}

/**

 * Normalizes $loginAction and checks if current request URL is same as login action.

 *

 * @param Controller $controller A reference to the controller object.

 * @return bool True if current action is login action else false.

 */

	protected function _isLoginAction(Controller $controller) {

		$url = '';

		if (isset($controller->request->url)) {

			$url = $controller->request->url;

		}

		$url = Router::normalize($url);

		$loginAction = Router::normalize($this->loginAction);

		return $loginAction === $url;

	}

/**

 * Handle unauthorized access attempt

 *

 * @param Controller $controller A reference to the controller object

 * @return bool Returns false

 * @throws ForbiddenException

 * @see AuthComponent::$unauthorizedRedirect

 */

	protected function _unauthorized(Controller $controller) {

		if ($this->unauthorizedRedirect === false) {

			throw new ForbiddenException($this->authError);

		}

		$this->flash($this->authError);

		if ($this->unauthorizedRedirect === true) {

			$default = '/';

			if (!empty($this->loginRedirect)) {

				$default = $this->loginRedirect;

			}

			$url = $controller->referer($default, true);

		} else {

			$url = $this->unauthorizedRedirect;

		}

		$controller->redirect($url, null, true);

		return false;

	}

/**

 * Attempts to introspect the correct values for object properties.

 *

 * @return bool True

 */

	protected function _setDefaults() {

		$defaults = array(

			'logoutRedirect' => $this->loginAction,

			'authError' => __d('cake', 'You are not authorized to access that location.')

		);

		foreach ($defaults as $key => $value) {

			if (!isset($this->{$key}) || $this->{$key} === true) {

				$this->{$key} = $value;

			}

		}

		return true;

	}

/**

 * Check if the provided user is authorized for the request.

 *

 * Uses the configured Authorization adapters to check whether or not a user is authorized.

 * Each adapter will be checked in sequence, if any of them return true, then the user will

 * be authorized for the request.

 *

 * @param array $user The user to check the authorization of. If empty the user in the session will be used.

 * @param CakeRequest $request The request to authenticate for. If empty, the current request will be used.

 * @return bool True if $user is authorized, otherwise false

 */

	public function isAuthorized($user = null, CakeRequest $request = null) {

		if (empty($user) && !$this->user()) {

			return false;

		}

		if (empty($user)) {

			$user = $this->user();

		}

		if (empty($request)) {

			$request = $this->request;

		}

		if (empty($this->_authorizeObjects)) {

			$this->constructAuthorize();

		}

		foreach ($this->_authorizeObjects as $authorizer) {

			if ($authorizer->authorize($user, $request) === true) {

				return true;

			}

		}

		return false;

	}

/**

 * Loads the authorization objects configured.

 *

 * @return mixed Either null when authorize is empty, or the loaded authorization objects.

 * @throws CakeException

 */

	public function constructAuthorize() {

		if (empty($this->authorize)) {

			return;

		}

		$this->_authorizeObjects = array();

		$config = Hash::normalize((array)$this->authorize);

		$global = array();

		if (isset($config[AuthComponent::ALL])) {

			$global = $config[AuthComponent::ALL];

			unset($config[AuthComponent::ALL]);

		}

		foreach ($config as $class => $settings) {

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

			$className = $class . 'Authorize';

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

			if (!class_exists($className)) {

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

			}

			if (!method_exists($className, 'authorize')) {

				throw new CakeException(__d('cake_dev', 'Authorization objects must implement an %s method.', 'authorize()'));

			}

			$settings = array_merge($global, (array)$settings);

			$this->_authorizeObjects[] = new $className($this->_Collection, $settings);

		}

		return $this->_authorizeObjects;

	}

/**

 * Takes a list of actions in the current controller for which authentication is not required, or

 * no parameters to allow all actions.

 *

 * You can use allow with either an array, or var args.

 *

 * `$this->Auth->allow(array('edit', 'add'));` or

 * `$this->Auth->allow('edit', 'add');` or

 * `$this->Auth->allow();` to allow all actions

 *

 * @param string|array $action Controller action name or array of actions

 * @return void

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#making-actions-public

 */

	public function allow($action = null) {

		$args = func_get_args();

		if (empty($args) || $action === null) {

			$this->allowedActions = $this->_methods;

			return;

		}

		if (isset($args[0]) && is_array($args[0])) {

			$args = $args[0];

		}

		$this->allowedActions = array_merge($this->allowedActions, $args);

	}

/**

 * Removes items from the list of allowed/no authentication required actions.

 *

 * You can use deny with either an array, or var args.

 *

 * `$this->Auth->deny(array('edit', 'add'));` or

 * `$this->Auth->deny('edit', 'add');` or

 * `$this->Auth->deny();` to remove all items from the allowed list

 *

 * @param string|array $action Controller action name or array of actions

 * @return void

 * @see AuthComponent::allow()

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#making-actions-require-authorization

 */

	public function deny($action = null) {

		$args = func_get_args();

		if (empty($args) || $action === null) {

			$this->allowedActions = array();

			return;

		}

		if (isset($args[0]) && is_array($args[0])) {

			$args = $args[0];

		}

		foreach ($args as $arg) {

			$i = array_search($arg, $this->allowedActions);

			if (is_int($i)) {

				unset($this->allowedActions[$i]);

			}

		}

		$this->allowedActions = array_values($this->allowedActions);

	}

/**

 * Maps action names to CRUD operations.

 *

 * Used for controller-based authentication. Make sure

 * to configure the authorize property before calling this method. As it delegates $map to all the

 * attached authorize objects.

 *

 * @param array $map Actions to map

 * @return void

 * @see BaseAuthorize::mapActions()

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#mapping-actions-when-using-crudauthorize

 */

	public function mapActions($map = array()) {

		if (empty($this->_authorizeObjects)) {

			$this->constructAuthorize();

		}

		foreach ($this->_authorizeObjects as $auth) {

			$auth->mapActions($map);

		}

	}

/**

 * Log a user in.

 *

 * If a $user is provided that data will be stored as the logged in user. If `$user` is empty or not

 * specified, the request will be used to identify a user. If the identification was successful,

 * the user record is written to the session key specified in AuthComponent::$sessionKey. Logging in

 * will also change the session id in order to help mitigate session replays.

 *

 * @param array $user Either an array of user data, or null to identify a user using the current request.

 * @return bool True on login success, false on failure

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#identifying-users-and-logging-them-in

 */

	public function login($user = null) {

		$this->_setDefaults();

		if (empty($user)) {

			$user = $this->identify($this->request, $this->response);

		}

		if ($user) {

			$this->Session->renew();

			$this->Session->write(self::$sessionKey, $user);

		}

		return $this->loggedIn();

	}

/**

 * Log a user out.

 *

 * Returns the logout action to redirect to. Triggers the logout() method of

 * all the authenticate objects, so they can perform custom logout logic.

 * AuthComponent will remove the session data, so there is no need to do that

 * in an authentication object. Logging out will also renew the session id.

 * This helps mitigate issues with session replays.

 *

 * @return string AuthComponent::$logoutRedirect

 * @see AuthComponent::$logoutRedirect

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#logging-users-out

 */

	public function logout() {

		$this->_setDefaults();

		if (empty($this->_authenticateObjects)) {

			$this->constructAuthenticate();

		}

		$user = $this->user();

		foreach ($this->_authenticateObjects as $auth) {

			$auth->logout($user);

		}

		$this->Session->delete(self::$sessionKey);

		$this->Session->delete('Auth.redirect');

		$this->Session->renew();

		return Router::normalize($this->logoutRedirect);

	}

/**

 * Get the current user.

 *

 * Will prefer the static user cache over sessions. The static user

 * cache is primarily used for stateless authentication. For stateful authentication,

 * cookies + sessions will be used.

 *

 * @param string $key field to retrieve. Leave null to get entire User record

 * @return mixed User record. or null if no user is logged in.

 * @link http://book.cakephp.org/2.0/en/core-libraries/components/authentication.html#accessing-the-logged-in-user

 */

	public static function user($key = null) {

		if (!empty(self::$_user)) {

			$user = self::$_user;

		} elseif (self::$sessionKey && CakeSession::check(self::$sessionKey)) {

			$user = CakeSession::read(self::$sessionKey);

		} else {

			return null;

		}

		if ($key === null) {

			return $user;

		}

		return Hash::get($user, $key);

	}

/**

 * Similar to AuthComponent::user() except if the session user cannot be found, connected authentication

 * objects will have their getUser() methods called. This lets stateless authentication methods function correctly.

 *

 * @return bool true if a user can be found, false if one cannot.

 */

	protected function _getUser() {

		$user = $this->user();

		if ($user) {

			$this->Session->delete('Auth.redirect');

			return true;

		}

		if (empty($this->_authenticateObjects)) {

			$this->constructAuthenticate();

		}

		foreach ($this->_authenticateObjects as $auth) {

			$result = $auth->getUser($this->request);

			if (!empty($result) && is_array($result)) {

				self::$_user = $result;

				return true;

			}

		}

		return false;

	}

/**

 * Backwards compatible alias for AuthComponent::redirectUrl().

 *

 * @param string|array $url Optional URL to write as the login redirect URL.

 * @return string Redirect URL

 * @deprecated 2.3 Use AuthComponent::redirectUrl() instead

 */

	public function redirect($url = null) {

		return $this->redirectUrl($url);

	}

/**

 * Get the URL a user should be redirected to upon login.

 *

 * Pass a URL in to set the destination a user should be redirected to upon

 * logging in.

 *

 * If no parameter is passed, gets the authentication redirect URL. The URL

 * returned is as per following rules:

 *

 *  - Returns the normalized URL from session Auth.redirect value if it is

 *    present and for the same domain the current app is running on.

 *  - If there is no session value and there is a $loginRedirect, the $loginRedirect

 *    value is returned.

 *  - If there is no session and no $loginRedirect, / is returned.

 *

 * @param string|array $url Optional URL to write as the login redirect URL.

 * @return string Redirect URL

 */

	public function redirectUrl($url = null) {

		if ($url !== null) {

			$redir = $url;

			$this->Session->write('Auth.redirect', $redir);

		} elseif ($this->Session->check('Auth.redirect')) {

			$redir = $this->Session->read('Auth.redirect');

			$this->Session->delete('Auth.redirect');

			if (Router::normalize($redir) === Router::normalize($this->loginAction)) {

				$redir = $this->loginRedirect;

			}

		} elseif ($this->loginRedirect) {

			$redir = $this->loginRedirect;

		} else {

			$redir = '/';

		}

		if (is_array($redir)) {

			return Router::url($redir + array('base' => false));

		}

		return $redir;

	}

/**

 * Use the configured authentication adapters, and attempt to identify the user

 * by credentials contained in $request.

 *

 * @param CakeRequest $request The request that contains authentication data.

 * @param CakeResponse $response The response

 * @return array User record data, or false, if the user could not be identified.

 */

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

		if (empty($this->_authenticateObjects)) {

			$this->constructAuthenticate();

		}

		foreach ($this->_authenticateObjects as $auth) {

			$result = $auth->authenticate($request, $response);

			if (!empty($result) && is_array($result)) {

				return $result;

			}

		}

		return false;

	}

/**

 * Loads the configured authentication objects.

 *

 * @return mixed either null on empty authenticate value, or an array of loaded objects.

 * @throws CakeException

 */

	public function constructAuthenticate() {

		if (empty($this->authenticate)) {

			return;

		}

		$this->_authenticateObjects = array();

		$config = Hash::normalize((array)$this->authenticate);

		$global = array();

		if (isset($config[AuthComponent::ALL])) {

			$global = $config[AuthComponent::ALL];

			unset($config[AuthComponent::ALL]);

		}

		foreach ($config as $class => $settings) {

			if (!empty($settings['className'])) {

				$class = $settings['className'];

				unset($settings['className']);

			}

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

			$className = $class . 'Authenticate';

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

			if (!class_exists($className)) {

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

			}

			if (!method_exists($className, 'authenticate')) {

				throw new CakeException(__d('cake_dev', 'Authentication objects must implement an %s method.', 'authenticate()'));

			}

			$settings = array_merge($global, (array)$settings);

			$this->_authenticateObjects[] = new $className($this->_Collection, $settings);

		}

		return $this->_authenticateObjects;

	}

/**

 * Hash a password with the application's salt value (as defined with Configure::write('Security.salt');

 *

 * This method is intended as a convenience wrapper for Security::hash(). If you want to use

 * a hashing/encryption system not supported by that method, do not use this method.

 *

 * @param string $password Password to hash

 * @return string Hashed password

 * @deprecated Since 2.4. Use Security::hash() directly or a password hasher object.

 */

	public static function password($password) {

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

	}

/**

 * Check whether or not the current user has data in the session, and is considered logged in.

 *

 * @return bool true if the user is logged in, false otherwise

 * @deprecated Since 2.5. Use AuthComponent::user() directly.

 */

	public function loggedIn() {

		return (bool)$this->user();

	}

/**

 * Set a flash message. Uses the Session component, and values from AuthComponent::$flash.

 *

 * @param string $message The message to set.

 * @return void

 */

	public function flash($message) {

		if ($message === false) {

			return;

		}

		$this->Session->setFlash($message, $this->flash['element'], $this->flash['params'], $this->flash['key']);

	}

}