Yii中处理前后台登录新方法

我一开始的做法是在后台登录时设置一个isadmin的session，然后再前台登录时注销这个session，这样做只能辨别是前台登录还是后台登录，但做不到前后台一起登录，也即前台登录了后台就退出了，后台登录了前台就退出了。出现这种原因的根本原因是我们使用了同一个Cwebuser实例，不能同时设置前后台session，要解决这个问题就要将前后台使用不同的Cwebuser实例登录。下面是我的做法，首先看protected->config->main.php里对前台user(Cwebuser)的配置:

'user'=>array(
             'class'=>'WebUser',//这个WebUser是继承CwebUser，稍后给出它的代码
            'stateKeyPrefix'=>'member',//这个是设置前台session的前缀
            'allowAutoLogin'=>true,//这里设置允许cookie保存登录信息，一边下次自动登录
        ),

在你用Gii生成一个admin(即后台模块名称)模块时，会在module->admin下生成一个AdminModule.php文件，该类继承了CWebModule类，下面给出这个文件的代码，关键之处就在该文件，望大家仔细研究：

<?php

class AdminModule extends CWebModule
{
    public function init()
    {
     // this method is called when the module is being created
     // you may place code here to customize the module or the application
         parent::init();//这步是调用main.php里的配置文件
    // import the module-level models and componen
    $this->setImport(array(
        'admin.models.*',
        'admin.components.*',
    ));
        //这里重写父类里的组件
        //如有需要还可以参考API添加相应组件
           Yii::app()->setComponents(array(
                   'errorHandler'=>array(
                           'class'=>'CErrorHandler',
                           'errorAction'=>'admin/default/error',
                   ),
                   'admin'=>array(
                           'class'=>'AdminWebUser',//后台登录类实例
                           'stateKeyPrefix'=>'admin',//后台session前缀
                           'loginUrl'=>Yii::app()->createUrl('admin/default/login'),
                   ),
           ), false);
           //下面这两行我一直没搞定啥意思，貌似CWebModule里也没generatorPaths属性和findGenerators()方法
           //$this->generatorPaths[]='admin.generators';
           //$this->controllerMap=$this->findGenerators();
    }
    public function beforeControllerAction($controller, $action){
            if(parent::beforeControllerAction($controller, $action)){
                $route=$controller->id.'/'.$action->id;
                if(!$this->allowIp(Yii::app()->request->userHostAddress) && $route!=='default/error')
                        throw new CHttpException(403,"You are not allowed to access this page.");
                $publicPages=array(
                        'default/login',
                        'default/error',
                );
                if(Yii::app()->user->isGuest && !in_array($route,$publicPages))
                        Yii::app()->user->loginRequired();
                else
                        return true;
            }
            return false;
        }
       protected function allowIp($ip)
        {
                if(empty($this->ipFilters))
                        return true;
                foreach($this->ipFilters as $filter)
                {
                        if($filter==='*' || $filter===$ip || (($pos=strpos($filter,'*'))!==false && !strncmp($ip,$filter,$pos)))
                                return true;
                }
                return false;
        }
}
?>

AdminModule 的init()方法就是给后台配置另外的登录实例，让前后台使用不同的CWebUser，并设置后台session前缀，以便与前台session区别开来(他们同事存在$_SESSION这个数组里，你可以打印出来看看)。

这样就已经做到了前后台登录分离开了，但是此时你退出的话你就会发现前后台一起退出了。于是我找到了logout()这个方法,发现他有一个参数$destroySession=true，原来如此，如果你只是logout()的话那就会将session全部注销，加一个false参数的话就只会注销当前登录实例的session了，这也就是为什么要设置前后台session前缀的原因了，下面我们看看设置了false参数的logout方法是如何注销session的：

/**
* 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]);
    }
}

看到没，就是利用匹配前缀的去注销的。

到此，我们就可以做到前后台登录分离，退出分离了。这样才更像一个应用，是吧？嘿嘿…

差点忘了说明一下：

Yii::app()->user//前台访问用户信息方法
Yii::app()->admin//后台访问用户信息方法

不懂的仔细看一下刚才前后台CWebUser的配置。

WebUser.php代码：

<?php
class WebUser extends CWebUser
{
    public function __get($name)
    {
        if ($this->hasState('__userInfo')) {
            $user=$this->getState('__userInfo',array());
            if (isset($user[$name])) {
                return $user[$name];
            }
        }

        return parent::__get($name);
    }

    public function login($identity, $duration) {
        $this->setState('__userInfo', $identity->getUser());
        parent::login($identity, $duration);
    }
}

?>

AdminWebUser.php代码

<?php
class AdminWebUser extends CWebUser
{
    public function __get($name)
    {
        if ($this->hasState('__adminInfo')) {
            $user=$this->getState('__adminInfo',array());
            if (isset($user[$name])) {
                return $user[$name];
            }
        }

        return parent::__get($name);
    }

    public function login($identity, $duration) {
        $this->setState('__adminInfo', $identity->getUser());
        parent::login($identity, $duration);
    }
}

?>

前台UserIdentity.php代码

<?php

/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity
{
    /**
     * Authenticates a user.
     * The example implementation makes sure if the username and password
     * are both 'demo'.
     * In practical applications, this should be changed to authenticate
     * against some persistent user identity storage (e.g. database).
     * @return boolean whether authentication succeeds.
     */
    public $user;
    public $_id;
    public $username;
    public function authenticate()
    {
        $this->errorCode=self::ERROR_PASSWORD_INVALID;
        $user=User::model()->find('username=:username',array(':username'=>$this->username));
         if ($user)
        {
            $encrypted_passwd=trim($user->password);
            $inputpassword = trim(md5($this->password));
            if($inputpassword===$encrypted_passwd)
            {
                $this->errorCode=self::ERROR_NONE;
                $this->setUser($user);
                $this->_id=$user->id;
                $this->username=$user->username;
                //if(isset(Yii::app()->user->thisisadmin))
                   // unset (Yii::app()->user->thisisadmin);
            }
            else
            {
                $this->errorCode=self::ERROR_PASSWORD_INVALID;

            }
        }
        else
        {
            $this->errorCode=self::ERROR_USERNAME_INVALID;
        }

        unset($user);
        return !$this->errorCode;

    }
    public function getUser()
    {
        return $this->user;
    }

    public function getId()
        {
                return $this->_id;
        }

    public function getUserName()
        {
                return $this->username;
        }

    public function setUser(CActiveRecord $user)
    {
        $this->user=$user->attributes;
    }
}

后台UserIdentity.php代码

<?php

/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity
{
    /**
     * Authenticates a user.
     * The example implementation makes sure if the username and password
     * are both 'demo'.
     * In practical applications, this should be changed to authenticate
     * against some persistent user identity storage (e.g. database).
     * @return boolean whether authentication succeeds.
     */
    public $admin;
    public $_id;
    public $username;
    public function authenticate()
    {
        $this->errorCode=self::ERROR_PASSWORD_INVALID;
        $user=Staff::model()->find('username=:username',array(':username'=>$this->username));
         if ($user)
        {
            $encrypted_passwd=trim($user->password);
            $inputpassword = trim(md5($this->password));
            if($inputpassword===$encrypted_passwd)
            {
                $this->errorCode=self::ERROR_NONE;
                $this->setUser($user);
                $this->_id=$user->id;
                $this->username=$user->username;
               // Yii::app()->user->setState("thisisadmin", "true");
            }
            else
            {
                $this->errorCode=self::ERROR_PASSWORD_INVALID;

            }
        }
        else
        {
            $this->errorCode=self::ERROR_USERNAME_INVALID;
        }

        unset($user);
        return !$this->errorCode;

    }
    public function getUser()
    {
        return $this->admin;
    }

    public function getId()
        {
                return $this->_id;
        }

    public function getUserName()
        {
                return $this->username;
        }

    public function setUser(CActiveRecord $user)
    {
        $this->admin=$user->attributes;
    }
}