/*** Switches to a new identity for the current user.** When [[enableSession]] is true, this method may use session and/or cookie to store the user identity information,* according to the value of `$duration`. Please refer to [[login()]] for more details.** This method is mainly called by [[login()]], [[logout()]] and [[loginByCookie()]]* when the current user needs to be associated with the corresponding identity information.** @param IdentityInterface|null $identity the identity information to be associated with the current user.* If null, it means switching the current user to be a guest.* @param integer $duration number of seconds that the user can remain in logged-in status.* This parameter is used only when `$identity` is not null.*/public function switchIdentity($identity, $duration = 0){$this->setIdentity($identity);if (!$this->enableSession) {return;}/* Ensure any existing identity cookies are removed. */if ($this->enableAutoLogin) {$this->removeIdentityCookie();}$session = Yii::$app->getSession();if (!YII_ENV_TEST) {$session->regenerateID(true);}$session->remove($this->idParam);$session->remove($this->authTimeoutParam);if ($identity) {$session->set($this->idParam, $identity->getId());if ($this->authTimeout !== null) {$session->set($this->authTimeoutParam, time() + $this->authTimeout);}if ($this->absoluteAuthTimeout !== null) {$session->set($this->absoluteAuthTimeoutParam, time() + $this->absoluteAuthTimeout);}if ($duration > 0 && $this->enableAutoLogin) {$this->sendIdentityCookie($identity, $duration);}}}

//已登录返回true
Yii::$app->user->isGuest

    /*** Returns a value indicating whether the user is a guest (not authenticated).* @return boolean whether the current user is a guest.* @see getIdentity()*/public function getIsGuest(){return $this->getIdentity() === null;}

    /*** Returns the identity object associated with the currently logged-in user.* When [[enableSession]] is true, this method may attempt to read the user's authentication data* stored in session and reconstruct the corresponding identity object, if it has not done so before.* @param boolean $autoRenew whether to automatically renew authentication status if it has not been done so before.* This is only useful when [[enableSession]] is true.* @return IdentityInterface|null the identity object associated with the currently logged-in user.* `null` is returned if the user is not logged in (not authenticated).* @see login()* @see logout()*/public function getIdentity($autoRenew = true){if ($this->_identity === false) {if ($this->enableSession && $autoRenew) {$this->_identity = null;$this->renewAuthStatus();} else {return null;}}return $this->_identity;}

    /*** Updates the authentication status using the information from session and cookie.** This method will try to determine the user identity using the [[idParam]] session variable.** If [[authTimeout]] is set, this method will refresh the timer.** If the user identity cannot be determined by session, this method will try to [[loginByCookie()|login by cookie]]* if [[enableAutoLogin]] is true.*/protected function renewAuthStatus(){$session = Yii::$app->getSession();$id = $session->getHasSessionId() || $session->getIsActive() ? $session->get($this->idParam) : null;if ($id === null) {$identity = null;} else {/* @var $class IdentityInterface */$class = $this->identityClass;$identity = $class::findIdentity($id);}$this->setIdentity($identity);if ($identity !== null && ($this->authTimeout !== null || $this->absoluteAuthTimeout !== null)) {$expire = $this->authTimeout !== null ? $session->get($this->authTimeoutParam) : null;$expireAbsolute = $this->absoluteAuthTimeout !== null ? $session->get($this->absoluteAuthTimeoutParam) : null;if ($expire !== null && $expire < time() || $expireAbsolute !== null && $expireAbsolute < time()) {$this->logout(false);} elseif ($this->authTimeout !== null) {$session->set($this->authTimeoutParam, time() + $this->authTimeout);}}if ($this->enableAutoLogin) {if ($this->getIsGuest()) {$this->loginByCookie();} elseif ($this->autoRenewCookie) {$this->renewIdentityCookie();}}}

<?php
/*** Created by PhpStorm.* User: zhenbao* Date: 16/10/17* Time: 下午4:14*/namespace app\models;use Yii;
use yii\web\IdentityInterface;
use yii\db\ActiveRecord;class User extends ActiveRecord implements IdentityInterface
{const LOGIN = "login";const REGISTER = "register";public function scenarios(){return [self::LOGIN => ['username', 'password'],self::REGISTER => ['username', 'password']];}public static function tableName(){return "user";}public static function findIdentity($id){return static::findOne($id);}public static function findIdentityByAccessToken($token, $type = null){return static::findOne(['accessToken' => $token]);}public function getId(){return $this -> id;}public function getAuthKey(){return $this -> authKey;}public function validateAuthKey($authKey){return $this -> getAuthKey() === $authKey;}public static function findIdentityByUsername($username){return static::findOne(['username' => $username]);}public function validatePassword($password){return $this -> password === sha1($password);}public function setPassword(){$this -> password = sha1($this -> password);return true;}public function beforeSave($insert){if(parent::beforeSave($insert)){if($this -> isNewRecord){$this -> authKey = Yii::$app -> security -> generateRandomString();}return true;}return false;}
}

<?phpnamespace app\controllers;use Yii;
use yii\web\Controller;
use app\models\User;
use yii\web\Cookie;class UserController extends Controller
{/**默认方法为home方法* @var string*/public $defaultAction = 'home';/**用户登录,当已经登录直接跳转home页面,* 否则,查看是否有访问accessToken,如果有使用accessToken登录,如果accessToken无效则删除accessToken然后返回到登录界面* 如果没有accessToken则使用用户的登录密码登录,验证成功后,查看是否选择了记住我,有则生成accessToken,下次直接使用accessToken登录* 登录失败,返回到登录界面重新登录。* @return string|\yii\web\Response*/public function actionLogin(){$request = Yii::$app->request->post('User');//如果已经登录获取认证identity然后进入home页面if (!(Yii::$app->user->isGuest)) {return $this->redirect('/?r=user/home');} else {//如果没有登录,查看cookie中是否有accessToken,如果有尝试使用accessToken登录,accessToken登录失败,则删除这个无效的accessToken$accessToken = Yii::$app->request->cookies->getValue('accessToken');if ($accessToken !== null) {if (Yii::$app->user->loginByAccessToken($accessToken)) {return $this->redirect("/?r=user/home");} else {Yii::$app->request->cookies->remove("accessToken");$user = new User(['scenario' => 'login']);return $this->renderPartial('login', ['model' => $user]);}}//尝试用户名密码登录,如果验证成功,查看是否有点击记住我,如果有生成accessToken,下次直接accessToken登录$request = Yii::$app->request->post('User');if ($request && isset($request['username']) && isset($request['password'])) {$user = User::findIdentityByUsername($request['username']);if ($user && $user->validatePassword($request['password'])) {$remeberMe = Yii::$app->request->post('remeberMe');if ($remeberMe === 'on') {//生成访问accessToken$user->accessToken = Yii::$app->security->generateRandomString();$user->scenario = 'login';$user->save();Yii::$app->response->cookies->add(new Cookie(['name' => 'accessToken','value' => $user->accessToken,'expire' => time() + 3600 * 24 * 7]));}Yii::$app->user->login($user);return $this->redirect('/?r=user/home');}}//accessToken和账号密码均无法登录,重新返回登录界面$user = new User(['scenario' => 'login']);return $this->renderPartial('login', ['model' => $user]);}}/**根据用户是否登录,选择跳转页面* @return string|\yii\web\Response*/public function actionHome(){if (Yii::$app->user->isGuest) {return $this->redirect('/?r=user/login');}$user = Yii::$app->user->getIdentity();return $this->renderPartial('home', ['user' => $user]);}/**退出登录,如果有删除accessToken,返回登录页面* @return \yii\web\Response*/public function actionLogout(){$user = Yii::$app->user->getIdentity();Yii::$app->user->logout($user);$accessToken = Yii::$app->request->cookies->getValue('accessToken');if ($accessToken !== null) {Yii::$app->response->cookies->remove('accessToken');}return $this->redirect('/?r=user/login');}/*** 注册用户,如果注册成功自动进入home主页,注册失败进入注册页面* @return string|\yii\web\Response*/public function actionRegister(){$user = new User(['scenario' => 'register']);$request = Yii::$app->request->post();if ($request) {if ($user->load($request) && $user->setPassword() && $user->save()) {Yii::$app->user->login($user);return $this->redirect('/?r=user/login');}}return $this->renderPartial('register', ['model' => $user]);}
}

<?phpuse yii\helpers\Html;
use yii\bootstrap\ActiveForm;$form = ActiveForm::begin(['id' => 'user','options' => ['class' => 'form-horizontal'],'fieldConfig' => ['template' => "{label}\n<div class=\"col-lg-3\">{input}</div>\n<div class=\"col-lg-8\">{error}</div>",'labelOptions' => ['class' => 'col-lg-1 control-label'],],]); ?><?= $form->field($model, 'username')->textInput(['autofocus' => true]) ?>
<?= $form->field($model, 'password')->passwordInput() ?>
<input type="checkbox" name="remeberMe" >记住我
<?= Html::submitButton('Login', ['class' => 'btn btn-primary', 'name' => 'login-button']) ?>
<?php ActiveForm::end(); ?>
<a href="/?r=user/register">注册</a>

<?phpuse yii\helpers\Html;
use yii\bootstrap\ActiveForm;$this->title = 'register';$form = ActiveForm::begin(['id' => 'login-form','options' => ['class' => 'form-horizontal'],'fieldConfig' => ['template' => "{label}\n<div class=\"col-lg-3\">{input}</div>\n<div class=\"col-lg-8\">{error}</div>",'labelOptions' => ['class' => 'col-lg-1 control-label'],],
]); ?><?= $form->field($model, 'username')->textInput(['autofocus' => true]) ?>
<?= $form->field($model, 'password')->passwordInput() ?>
<?= Html::submitButton('Register', ['class' => 'btn btn-primary', 'name' => 'login-button']) ?>
<?php ActiveForm::end(); ?>
<a href="/?r=user/login">登录</a>

<?phpecho $user -> username;
?>
<a href="/?r=user/logout">退出</a>