Laravel框架用户登陆身份验证实现方法详解

　　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::__callStatic Illuminate\Auth\AuthManager->guest() Illuminate\Support\Manager->__call public 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 ?: $this->getDefaultDriver(); // If the given driver has not been created before, we will create the instances // here and cache it so we can return it next time very quickly. If there is // already a driver created by this name, well just return that instance. if ( ! isset($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。