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())
{
returnRedirect::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：
classAuthextendsFacade{
/**
*Gettheregisterednameofthecomponent.
*
*@returnstring
*/
protectedstaticfunctiongetFacadeAccessor(){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)
{
//Oncetheauthenticationservicehasactuallybeenrequestedbythedeveloper
//wewillsetavariableintheapplicationindicatingsuch.Thishelpsus
//knowthatweneedtosetanyqueuedcookiesintheaftereventlater.
$app['auth.loaded']=true;
returnnewAuthManager($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
publicfunction__call($method,$parameters)
{
returncall_user_func_array(array($this->driver(),$method),$parameters);
}
看下driver的代码：
publicfunctiondriver($driver=null)
{
$driver=$driver?:$this->getDefaultDriver();
//Ifthegivendriverhasnotbeencreatedbefore,wewillcreatetheinstances
//hereandcacheitsowecanreturnitnexttimeveryquickly.Ifthereis
//alreadyadrivercreatedbythisname,we'lljustreturnthatinstance.
if(!isset($this->drivers[$driver]))
{
$this->drivers[$driver]=$this->createDriver($driver);
}
return$this->drivers[$driver];
}
没有会调用getDefaultDrive方法
/**
*Getthedefaultauthenticationdrivername.
*
*@returnstring
*/
publicfunctiongetDefaultDriver()
{
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
publicfunctioncreateEloquentDriver()
{
$provider=$this->createEloquentProvider();
returnnewGuard($provider,$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
publicfunctionuser()
{
if($this->loggedOut)return;
//Ifwehavealreadyretrievedtheuserforthecurrentrequestwecanjust
//returnitbackimmediately.Wedonotwanttopulltheuserdataevery
//requestintothemethodbecausethatwouldtremendouslyslowanapp.
if(!is_null($this->user))
{
return$this->user;
}
$id=$this->session->get($this->getName());
//Firstwewilltrytoloadtheuserusingtheidentifierinthesessionif
//oneexists.Otherwisewewillcheckfora"rememberme"cookieinthis
//request,andifoneexists,attempttoretrievetheuserusingthat.
$user=null;
if(!is_null($id))
{
//provider为EloquentUserProvider
$user=$this->provider->retrieveByID($id);
}
//Iftheuserisnull,butwedecrypta"recaller"cookiewecanattemptto
//pulltheuserdataonthatcookiewhichservesasaremembercookieon
//theapplication.Oncewehaveauserwecanreturnittothecaller.
$recaller=$this->getRecaller();
if(is_null($user)&&!is_null($recaller))
{
$user=$this->getUserByRecaller($recaller);
}
return$this->user=$user;
}
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