mirror of
https://github.com/yiisoft/yii2.git
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579 lines
20 KiB
PHP
579 lines
20 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\web;
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use yii\base\Component;
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/**
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* CWebUser represents the persistent state for a Web application user.
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*
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* CWebUser is used as an application component whose ID is 'user'.
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* Therefore, at any place one can access the user state via
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* <code>Yii::app()->user</code>.
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*
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* CWebUser should be used together with an {@link IUserIdentity identity}
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* which implements the actual authentication algorithm.
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*
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* A typical authentication process using CWebUser is as follows:
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* <ol>
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* <li>The user provides information needed for authentication.</li>
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* <li>An {@link IUserIdentity identity instance} is created with the user-provided information.</li>
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* <li>Call {@link IUserIdentity::authenticate} to check if the identity is valid.</li>
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* <li>If valid, call {@link CWebUser::login} to login the user, and
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* Redirect the user browser to {@link returnUrl}.</li>
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* <li>If not valid, retrieve the error code or message from the identity
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* instance and display it.</li>
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* </ol>
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*
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* The property {@link id} and {@link name} are both identifiers
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* for the user. The former is mainly used internally (e.g. primary key), while
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* the latter is for display purpose (e.g. username). The {@link id} property
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* is a unique identifier for a user that is persistent
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* during the whole user session. It can be a username, or something else,
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* depending on the implementation of the {@link IUserIdentity identity class}.
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*
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* Both {@link id} and {@link name} are persistent during the user session.
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* Besides, an identity may have additional persistent data which can
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* be accessed by calling {@link getState}.
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* Note, when {@link enableAutoLogin cookie-based authentication} is enabled,
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* all these persistent data will be stored in cookie. Therefore, do not
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* store password or other sensitive data in the persistent storage. Instead,
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* you should store them directly in session on the server side if needed.
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*
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* @property boolean $isGuest Whether the current application user is a guest.
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* @property mixed $id The unique identifier for the user. If null, it means the user is a guest.
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* @property string $name The user name. If the user is not logged in, this will be {@link guestName}.
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* @property string $returnUrl The URL that the user should be redirected to after login.
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* @property string $stateKeyPrefix A prefix for the name of the session variables storing user session data.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class User extends Component
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{
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const STATES_VAR = '__states';
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const AUTH_TIMEOUT_VAR = '__timeout';
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/**
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* @var boolean whether to enable cookie-based login. Defaults to false.
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*/
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public $enableAutoLogin = false;
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/**
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* @var string|array the URL for login when [[loginRequired()]] is called.
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* If an array is given, [[UrlManager::createUrl()]] will be called to create the corresponding URL.
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* The first element of the array should be the route to the login action, and the rest of
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* the name-value pairs are GET parameters used to construct the login URL. For example,
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*
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* ~~~
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* array('site/login', 'ref' => 1)
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* ~~~
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*
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* If this property is null, a 403 HTTP exception will be raised when [[loginRequired()]] is called.
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*/
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public $loginUrl = array('site/login');
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/**
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* @var array the configuration of the identity cookie. This property is used only when [[enableAutoLogin]] is true.
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* @see Cookie
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*/
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public $identityCookie;
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/**
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* @var integer the number of seconds in which the user will be logged out automatically if he
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* remains inactive. If this property is not set, the user will be logged out after
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* the current session expires (c.f. [[Session::timeout]]).
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*/
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public $authTimeout;
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/**
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* @var boolean whether to automatically renew the identity cookie each time a page is requested.
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* Defaults to false. This property is effective only when {@link enableAutoLogin} is true.
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* When this is false, the identity cookie will expire after the specified duration since the user
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* is initially logged in. When this is true, the identity cookie will expire after the specified duration
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* since the user visits the site the last time.
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* @see enableAutoLogin
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* @since 1.1.0
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*/
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public $autoRenewCookie = false;
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/**
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* @var string value that will be echoed in case that user session has expired during an ajax call.
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* When a request is made and user session has expired, {@link loginRequired} redirects to {@link loginUrl} for login.
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* If that happens during an ajax call, the complete HTML login page is returned as the result of that ajax call. That could be
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* a problem if the ajax call expects the result to be a json array or a predefined string, as the login page is ignored in that case.
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* To solve this, set this property to the desired return value.
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*
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* If this property is set, this value will be returned as the result of the ajax call in case that the user session has expired.
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* @since 1.1.9
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* @see loginRequired
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*/
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public $loginRequiredAjaxResponse;
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private $_keyPrefix;
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private $_access = array();
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/**
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* Initializes the application component.
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*/
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public function init()
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{
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parent::init();
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Yii::app()->getSession()->open();
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if ($this->getIsGuest() && $this->enableAutoLogin) {
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$this->restoreFromCookie();
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} elseif ($this->autoRenewCookie && $this->enableAutoLogin) {
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$this->renewCookie();
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}
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$this->updateAuthStatus();
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}
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/**
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* Logs in a user.
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*
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* The user identity information will be saved in storage that is
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* persistent during the user session. By default, the storage is simply
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* the session storage. If the duration parameter is greater than 0,
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* a cookie will be sent to prepare for cookie-based login in future.
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*
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* Note, you have to set {@link enableAutoLogin} to true
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* if you want to allow user to be authenticated based on the cookie information.
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*
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* @param IUserIdentity $identity the user identity (which should already be authenticated)
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* @param integer $duration number of seconds that the user can remain in logged-in status. Defaults to 0, meaning login till the user closes the browser.
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* If greater than 0, cookie-based login will be used. In this case, {@link enableAutoLogin}
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* must be set true, otherwise an exception will be thrown.
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* @return boolean whether the user is logged in
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*/
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public function login($identity, $duration = 0)
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{
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$id = $identity->getId();
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$states = $identity->getPersistentStates();
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if ($this->beforeLogin($id, $states, false)) {
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$this->changeIdentity($id, $identity->getName(), $states);
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if ($duration > 0) {
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if ($this->enableAutoLogin) {
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$this->saveToCookie($duration);
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} else {
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throw new CException(Yii::t('yii', '{class}.enableAutoLogin must be set true in order to use cookie-based authentication.',
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array('{class}' => get_class($this))));
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}
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}
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$this->afterLogin(false);
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}
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return !$this->getIsGuest();
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}
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/**
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* Logs out the current user.
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* This will remove authentication-related session data.
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* If the parameter is true, the whole session will be destroyed as well.
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* @param boolean $destroySession whether to destroy the whole session. Defaults to true. If false,
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* then {@link clearStates} will be called, which removes only the data stored via {@link setState}.
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*/
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public function logout($destroySession = true)
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{
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if ($this->beforeLogout()) {
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if ($this->enableAutoLogin) {
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Yii::app()->getRequest()->getCookies()->remove($this->getStateKeyPrefix());
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if ($this->identityCookie !== null) {
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$cookie = $this->createIdentityCookie($this->getStateKeyPrefix());
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$cookie->value = null;
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$cookie->expire = 0;
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Yii::app()->getRequest()->getCookies()->add($cookie->name, $cookie);
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}
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}
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if ($destroySession) {
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Yii::app()->getSession()->destroy();
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} else {
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$this->clearStates();
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}
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$this->_access = array();
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$this->afterLogout();
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}
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}
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/**
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* Returns a value indicating whether the user is a guest (not authenticated).
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* @return boolean whether the current application user is a guest.
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*/
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public function getIsGuest()
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{
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return $this->getState('__id') === null;
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}
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/**
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* Returns a value that uniquely represents the user.
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* @return mixed the unique identifier for the user. If null, it means the user is a guest.
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*/
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public function getId()
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{
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return $this->getState('__id');
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}
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/**
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* @param mixed $value the unique identifier for the user. If null, it means the user is a guest.
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*/
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public function setId($value)
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{
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$this->setState('__id', $value);
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}
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/**
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* Returns the URL that the user should be redirected to after successful login.
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* This property is usually used by the login action. If the login is successful,
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* the action should read this property and use it to redirect the user browser.
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* @param string $defaultUrl the default return URL in case it was not set previously. If this is null,
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* the application entry URL will be considered as the default return URL.
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* @return string the URL that the user should be redirected to after login.
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* @see loginRequired
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*/
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public function getReturnUrl($defaultUrl = null)
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{
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if ($defaultUrl === null) {
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$defaultReturnUrl = Yii::app()->getUrlManager()->showScriptName ? Yii::app()->getRequest()->getScriptUrl() : Yii::app()->getRequest()->getBaseUrl() . '/';
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} else {
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$defaultReturnUrl = CHtml::normalizeUrl($defaultUrl);
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}
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return $this->getState('__returnUrl', $defaultReturnUrl);
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}
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/**
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* @param string $value the URL that the user should be redirected to after login.
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*/
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public function setReturnUrl($value)
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{
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$this->setState('__returnUrl', $value);
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}
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/**
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* Redirects the user browser to the login page.
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* Before the redirection, the current URL (if it's not an AJAX url) will be
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* kept in {@link returnUrl} so that the user browser may be redirected back
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* to the current page after successful login. Make sure you set {@link loginUrl}
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* so that the user browser can be redirected to the specified login URL after
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* calling this method.
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* After calling this method, the current request processing will be terminated.
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*/
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public function loginRequired()
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{
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$app = Yii::app();
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$request = $app->getRequest();
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if (!$request->getIsAjaxRequest()) {
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$this->setReturnUrl($request->getUrl());
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} elseif (isset($this->loginRequiredAjaxResponse)) {
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echo $this->loginRequiredAjaxResponse;
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Yii::app()->end();
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}
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if (($url = $this->loginUrl) !== null) {
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if (is_array($url)) {
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$route = isset($url[0]) ? $url[0] : $app->defaultController;
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$url = $app->createUrl($route, array_splice($url, 1));
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}
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$request->redirect($url);
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} else {
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throw new CHttpException(403, Yii::t('yii', 'Login Required'));
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}
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}
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/**
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* This method is called before logging in a user.
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* You may override this method to provide additional security check.
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* For example, when the login is cookie-based, you may want to verify
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* that the user ID together with a random token in the states can be found
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* in the database. This will prevent hackers from faking arbitrary
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* identity cookies even if they crack down the server private key.
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* @param mixed $id the user ID. This is the same as returned by {@link getId()}.
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* @param array $states a set of name-value pairs that are provided by the user identity.
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* @param boolean $fromCookie whether the login is based on cookie
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* @return boolean whether the user should be logged in
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* @since 1.1.3
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*/
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protected function beforeLogin($id, $states, $fromCookie)
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{
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return true;
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}
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/**
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* This method is called after the user is successfully logged in.
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* You may override this method to do some postprocessing (e.g. log the user
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* login IP and time; load the user permission information).
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* @param boolean $fromCookie whether the login is based on cookie.
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* @since 1.1.3
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*/
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protected function afterLogin($fromCookie)
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{
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}
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/**
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* This method is invoked when calling {@link logout} to log out a user.
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* If this method return false, the logout action will be cancelled.
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* You may override this method to provide additional check before
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* logging out a user.
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* @return boolean whether to log out the user
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* @since 1.1.3
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*/
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protected function beforeLogout()
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{
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return true;
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}
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/**
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* This method is invoked right after a user is logged out.
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* You may override this method to do some extra cleanup work for the user.
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* @since 1.1.3
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*/
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protected function afterLogout()
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{
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}
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/**
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* Populates the current user object with the information obtained from cookie.
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* This method is used when automatic login ({@link enableAutoLogin}) is enabled.
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* The user identity information is recovered from cookie.
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* Sufficient security measures are used to prevent cookie data from being tampered.
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* @see saveToCookie
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*/
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protected function restoreFromCookie()
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{
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$app = Yii::app();
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$request = $app->getRequest();
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$cookie = $request->getCookies()->itemAt($this->getStateKeyPrefix());
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if ($cookie && !empty($cookie->value) && is_string($cookie->value) && ($data = $app->getSecurityManager()->validateData($cookie->value)) !== false) {
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$data = @unserialize($data);
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if (is_array($data) && isset($data[0], $data[1], $data[2], $data[3])) {
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list($id, $name, $duration, $states) = $data;
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if ($this->beforeLogin($id, $states, true)) {
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$this->changeIdentity($id, $name, $states);
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if ($this->autoRenewCookie) {
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$cookie->expire = time() + $duration;
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$request->getCookies()->add($cookie->name, $cookie);
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}
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$this->afterLogin(true);
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}
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}
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}
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}
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/**
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* Renews the identity cookie.
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* This method will set the expiration time of the identity cookie to be the current time
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* plus the originally specified cookie duration.
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* @since 1.1.3
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*/
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protected function renewCookie()
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{
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$request = Yii::app()->getRequest();
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$cookies = $request->getCookies();
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$cookie = $cookies->itemAt($this->getStateKeyPrefix());
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if ($cookie && !empty($cookie->value) && ($data = Yii::app()->getSecurityManager()->validateData($cookie->value)) !== false) {
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$data = @unserialize($data);
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if (is_array($data) && isset($data[0], $data[1], $data[2], $data[3])) {
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$cookie->expire = time() + $data[2];
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$cookies->add($cookie->name, $cookie);
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}
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}
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}
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/**
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* Saves necessary user data into a cookie.
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* This method is used when automatic login ({@link enableAutoLogin}) is enabled.
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* This method saves user ID, username, other identity states and a validation key to cookie.
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* These information are used to do authentication next time when user visits the application.
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* @param integer $duration number of seconds that the user can remain in logged-in status. Defaults to 0, meaning login till the user closes the browser.
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* @see restoreFromCookie
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*/
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protected function saveToCookie($duration)
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{
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$app = Yii::app();
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$cookie = $this->createIdentityCookie($this->getStateKeyPrefix());
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$cookie->expire = time() + $duration;
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$data = array(
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$this->getId(),
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$this->getName(),
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$duration,
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$this->saveIdentityStates(),
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);
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$cookie->value = $app->getSecurityManager()->hashData(serialize($data));
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$app->getRequest()->getCookies()->add($cookie->name, $cookie);
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}
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/**
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* Creates a cookie to store identity information.
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* @param string $name the cookie name
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* @return CHttpCookie the cookie used to store identity information
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*/
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protected function createIdentityCookie($name)
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{
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$cookie = new CHttpCookie($name, '');
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if (is_array($this->identityCookie)) {
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foreach ($this->identityCookie as $name => $value) {
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$cookie->$name = $value;
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}
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}
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return $cookie;
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}
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/**
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* @return string a prefix for the name of the session variables storing user session data.
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*/
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public function getStateKeyPrefix()
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{
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if ($this->_keyPrefix !== null) {
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return $this->_keyPrefix;
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} else {
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return $this->_keyPrefix = md5('Yii.' . get_class($this) . '.' . Yii::app()->getId());
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}
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}
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/**
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* @param string $value a prefix for the name of the session variables storing user session data.
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*/
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public function setStateKeyPrefix($value)
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{
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$this->_keyPrefix = $value;
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}
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/**
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* Returns the value of a variable that is stored in user session.
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*
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* This function is designed to be used by CWebUser descendant classes
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* who want to store additional user information in user session.
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* A variable, if stored in user session using {@link setState} can be
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* retrieved back using this function.
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*
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* @param string $key variable name
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* @param mixed $defaultValue default value
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* @return mixed the value of the variable. If it doesn't exist in the session,
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* the provided default value will be returned
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* @see setState
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*/
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public function getState($key, $defaultValue = null)
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{
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$key = $this->getStateKeyPrefix() . $key;
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return isset($_SESSION[$key]) ? $_SESSION[$key] : $defaultValue;
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}
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/**
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* Stores a variable in user session.
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*
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* This function is designed to be used by CWebUser descendant classes
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* who want to store additional user information in user session.
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* By storing a variable using this function, the variable may be retrieved
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* back later using {@link getState}. The variable will be persistent
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* across page requests during a user session.
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*
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* @param string $key variable name
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* @param mixed $value variable value
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* @param mixed $defaultValue default value. If $value===$defaultValue, the variable will be
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* removed from the session
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* @see getState
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*/
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public function setState($key, $value, $defaultValue = null)
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{
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$key = $this->getStateKeyPrefix() . $key;
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if ($value === $defaultValue) {
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unset($_SESSION[$key]);
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} else {
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$_SESSION[$key] = $value;
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}
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}
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/**
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* Returns a value indicating whether there is a state of the specified name.
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* @param string $key state name
|
|
* @return boolean whether there is a state of the specified name.
|
|
*/
|
|
public function hasState($key)
|
|
{
|
|
$key = $this->getStateKeyPrefix() . $key;
|
|
return isset($_SESSION[$key]);
|
|
}
|
|
|
|
/**
|
|
* Clears all user identity information from persistent storage.
|
|
* This will remove the data stored via {@link setState}.
|
|
*/
|
|
public function clearStates()
|
|
{
|
|
$keys = array_keys($_SESSION);
|
|
$prefix = $this->getStateKeyPrefix();
|
|
$n = strlen($prefix);
|
|
foreach ($keys as $key) {
|
|
if (!strncmp($key, $prefix, $n)) {
|
|
unset($_SESSION[$key]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Changes the current user with the specified identity information.
|
|
* This method is called by {@link login} and {@link restoreFromCookie}
|
|
* when the current user needs to be populated with the corresponding
|
|
* identity information. Derived classes may override this method
|
|
* by retrieving additional user-related information. Make sure the
|
|
* parent implementation is called first.
|
|
* @param mixed $id a unique identifier for the user
|
|
* @param string $name the display name for the user
|
|
* @param array $states identity states
|
|
*/
|
|
protected function changeIdentity($id, $name, $states)
|
|
{
|
|
Yii::app()->getSession()->regenerateID(true);
|
|
$this->setId($id);
|
|
$this->setName($name);
|
|
$this->loadIdentityStates($states);
|
|
}
|
|
|
|
/**
|
|
* Retrieves identity states from persistent storage and saves them as an array.
|
|
* @return array the identity states
|
|
*/
|
|
protected function saveIdentityStates()
|
|
{
|
|
$states = array();
|
|
foreach ($this->getState(self::STATES_VAR, array()) as $name => $dummy) {
|
|
$states[$name] = $this->getState($name);
|
|
}
|
|
return $states;
|
|
}
|
|
|
|
/**
|
|
* Loads identity states from an array and saves them to persistent storage.
|
|
* @param array $states the identity states
|
|
*/
|
|
protected function loadIdentityStates($states)
|
|
{
|
|
$names = array();
|
|
if (is_array($states)) {
|
|
foreach ($states as $name => $value) {
|
|
$this->setState($name, $value);
|
|
$names[$name] = true;
|
|
}
|
|
}
|
|
$this->setState(self::STATES_VAR, $names);
|
|
}
|
|
|
|
/**
|
|
* Updates the authentication status according to {@link authTimeout}.
|
|
* If the user has been inactive for {@link authTimeout} seconds,
|
|
* he will be automatically logged out.
|
|
*/
|
|
protected function updateAuthStatus()
|
|
{
|
|
if ($this->authTimeout !== null && !$this->getIsGuest()) {
|
|
$expires = $this->getState(self::AUTH_TIMEOUT_VAR);
|
|
if ($expires !== null && $expires < time()) {
|
|
$this->logout(false);
|
|
} else {
|
|
$this->setState(self::AUTH_TIMEOUT_VAR, time() + $this->authTimeout);
|
|
}
|
|
}
|
|
}
|
|
}
|