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

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

$this->app->bindShared('auth', function($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);});

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);}

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];}

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

'driver' => 'eloquent'

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

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;}