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使用Laravel框架怎么實現(xiàn)一個用戶登陸身份驗證功能?針對這個問題,這篇文章詳細(xì)介紹了相對應(yīng)的分析和解答,希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。
laravel中檢測用戶是否登錄,有以下的代碼:
if ( !Auth::guest() ) { return Redirect::to('/dashboard'); }
那Auth::guest
是如何調(diào)用的呢?
laravel用了Facade模式,相關(guān)門面類在laravel/framework/src/Illuminate/Support/Facades文件夾定義的,看下Auth類的定義:
class Auth extends Facade { /** * Get the registered name of the component. * * @return string */ protected static function getFacadeAccessor() { return 'auth'; } }
laravel框架中,F(xiàn)acade模式使用反射,相關(guān)方法其實調(diào)用app['auth']中的方法,app['auth']是什么時候創(chuàng)建的呢,
AuthServiceProvider::register
方法會注冊:
$this->app->bindShared('auth', function($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); });
那為什么最終會調(diào)到哪里呢,看下堆棧:
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), $parameters); }
看下driver的代碼:
public function driver($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]; }
沒有會調(diào)用getDefaultDrive方法
/** * Get the default authentication driver name. * * @return string */ public function getDefaultDriver() { return $this->app['config']['auth.driver']; }
最終調(diào)用的是配置文件中配置的driver,如果配的是
'driver' => 'eloquent'
則調(diào)用的是
public function createEloquentDriver() { $provider = $this->createEloquentProvider(); return new Guard($provider, $this->app['session.store']); }
所以Auth::guest
最終調(diào)用的是Guard::guest
方法
這里的邏輯先從session中取用戶信息,奇怪的是session里只保存的是用戶ID,然后拿這個ID來從數(shù)據(jù)庫中取用戶信息
public function user() { if ($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為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; }
關(guān)于使用Laravel框架怎么實現(xiàn)一個用戶登陸身份驗證功能問題的解答就分享到這里了,希望以上內(nèi)容可以對大家有一定的幫助,如果你還有很多疑惑沒有解開,可以關(guān)注億速云行業(yè)資訊頻道了解更多相關(guān)知識。
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