Laravel框架用户登陆身份验证实现方法详解

Laravel  /  管理员 发布于 8年前   229

本文实例讲述了Laravel框架用户登陆身份验证实现方法。分享给大家供大家参考，具体如下：

laravel中检测用户是否登录，有以下的代码：

if ( !Auth::guest() ){  return Redirect::to('/dashboard');}

那Auth::guest是如何调用的呢？

laravel用了Facade模式，相关门面类在laravel/framework/src/Illuminate/Support/Facades文件夹定义的，看下Auth类的定义：

class Auth extends Facade {  /**   * Get the registered name of the component.   *   * @return string   */  protected static function getFacadeAccessor() { return 'auth'; }}

laravel框架中，Facade模式使用反射，相关方法其实调用app['auth']中的方法，app['auth']是什么时候创建的呢，

AuthServiceProvider::register方法会注册：

$this->app->bindShared('auth', function($app){  // Once the authentication service has actually been requested by the developer  // we will set a variable in the application indicating such. This helps us  // know that we need to set any queued cookies in the after event later.  $app['auth.loaded'] = true;  return new AuthManager($app);});

那为什么最终会调到哪里呢，看下堆栈：

Illuminate\Support\Facades\Auth::guest()Illuminate\Support\Facades\Facade::__callStaticIlluminate\Auth\AuthManager->guest()Illuminate\Support\Manager->__callpublic function __call($method, $parameters){    return call_user_func_array(array($this->driver(), $method), $parameters);}

看下driver的代码：

public function driver($driver = null){    $driver = $driver ?: $this->getDefaultDriver();    // If the given driver has not been created before, we will create the instances    // here and cache it so we can return it next time very quickly. If there is    // already a driver created by this name, we'll just return that instance.    if ( ! isset($this->drivers[$driver]))    {      $this->drivers[$driver] = $this->createDriver($driver);    }    return $this->drivers[$driver];}

没有会调用getDefaultDrive方法

/*** Get the default authentication driver name.** @return string*/public function getDefaultDriver(){    return $this->app['config']['auth.driver'];}

最终调用的是配置文件中配置的driver，如果配的是

'driver' => 'eloquent'

则调用的是

public function createEloquentDriver(){    $provider = $this->createEloquentProvider();    return new Guard($provider, $this->app['session.store']);}

所以Auth::guest最终调用的是Guard::guest方法

这里的逻辑先从session中取用户信息，奇怪的是session里只保存的是用户ID，然后拿这个ID来从数据库中取用户信息

public function user(){    if ($this->loggedOut) return;    // If we have already retrieved the user for the current request we can just    // return it back immediately. We do not want to pull the user data every    // request into the method because that would tremendously slow an app.    if ( ! is_null($this->user))    {      return $this->user;    }    $id = $this->session->get($this->getName());    // First we will try to load the user using the identifier in the session if    // one exists. Otherwise we will check for a "remember me" cookie in this    // request, and if one exists, attempt to retrieve the user using that.    $user = null;    if ( ! is_null($id))    {      //provider为EloquentUserProvider     $user = $this->provider->retrieveByID($id);    }    // If the user is null, but we decrypt a "recaller" cookie we can attempt to    // pull the user data on that cookie which serves as a remember cookie on    // the application. Once we have a user we can return it to the caller.    $recaller = $this->getRecaller();    if (is_null($user) && ! is_null($recaller))    {      $user = $this->getUserByRecaller($recaller);    }    return $this->user = $user;}

更多关于Laravel相关内容感兴趣的读者可查看本站专题：《Laravel框架入门与进阶教程》、《php优秀开发框架总结》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家基于Laravel框架的PHP程序设计有所帮助。

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