编程学习网 > PHP技术 > laravel > Laravel 自动生成验证的实例讲解:login / logout
2019
10-14

Laravel 自动生成验证的实例讲解:login / logout

Laravel 自动授权讲解

看到这部分文档,经常看见的一句话就是php artisan make:auth,经常好奇这段代码到底干了什么,现在就来扒一扒。

路由

路由文件中会新加入以下内容:


Auth::routes();
Route::get('/home','HomeController@index')->name('home');
首先先是Auth::route();,这句代码等于以下全部设置(文件位置是\Illuminate\Routing\Router.php):



/**
  * Register the typical authentication routes for an application.
  *
  * @return void
  */
 public function auth()
 {
  // Authentication Routes...
  $this->get('login', 'Auth\LoginController@showLoginForm')->name('login');
  $this->post('login', 'Auth\LoginController@login');
  $this->post('logout', 'Auth\LoginController@logout')->name('logout');
 
  // Registration Routes...
  $this->get('register', 'Auth\RegisterController@showRegistrationForm')->name('register');
  $this->post('register', 'Auth\RegisterController@register');
 
  // Password Reset Routes...
  $this->get('password/reset', 'Auth\ForgotPasswordController@showLinkRequestForm')->name('password.request');
  $this->post('password/email', 'Auth\ForgotPasswordController@sendResetLinkEmail')->name('password.email');
  $this->get('password/reset/{token}', 'Auth\ResetPasswordController@showResetForm')->name('password.reset');
  $this->post('password/reset', 'Auth\ResetPasswordController@reset');


这一部分先讲注册,首先,可以看到登录(login)的路由指向的是Auth\LoginController@showLoginForm,这个控制器是app\Http\Auth\LoginController.php,这里贴一下他的代码:


class LoginController extends Controller
{
 /*
 |--------------------------------------------------------------------------
 | Login Controller
 |--------------------------------------------------------------------------
 |
 | This controller handles authenticating users for the application and
 | redirecting them to your home screen. The controller uses a trait
 | to conveniently provide its functionality to your applications.
 |
 */
 
 use AuthenticatesUsers;
 
 /**
  * Where to redirect users after login.
  *
  * @var string
  */
 protected $redirectTo = '/home';
 
 /**
  * Create a new controller instance.
  *
  * @return void
  */
 public function __construct()
 {
  $this->middleware('guest')->except('logout');
 }
}


而其中并没有设置showLoginForm方法,该方法被保存在trait AuthenticatesUsers中,该方法的代码如下:


public function showLoginForm()
 {
  return view('auth.login');
 }
就是返回一个视图,下面我们来看该视图:



<form class="form-horizontal" method="POST" action="{{ route('login') }}">
</form>


而其中最重要的就是看这个表单被提交到了哪里,结合上面的路由表,可以看到是


public function login(Request $request)
 {
  $this->validateLogin($request);
  /**
  *
  protected function validateLogin(Request $request)
 {
  $this->validate($request, [
   $this->username() => 'required|string',
   'password' => 'required|string',
  ]);
 }
  其中 $this->username() 就是 return 'email';
  **/
  // 限制请求次数,防止暴力破解的
  if ($this->hasTooManyLoginAttempts($request)) {
   $this->fireLockoutEvent($request);
 
   return $this->sendLockoutResponse($request);
  }
  /**
  // 关于 attempt 的介绍可以看我上一篇博客
  protected function attemptLogin(Request $request)
 {
  return $this->guard()->attempt(
   $this->credentials($request), $request->has('remember')
  );
 }
 **/
  // 如果验证通过的话
  if ($this->attemptLogin($request)) {
   return $this->sendLoginResponse($request);
  }
  // 否则的话增加验证的统计次数
  $this->incrementLoginAttempts($request);
  // 返回错误信息
  return $this->sendFailedLoginResponse($request);
 }



可以看到验证的重点还是Auth::attempt()函数,而且默认是使用email进行验证。

退出操作的代码如下:

public function logout(Request $request)
 {
  $this->guard()->logout();
 
  $request->session()->invalidate();
 
  return redirect('/');
 }
$this->guard()的代码如下:



protected function guard()
 {
  return Auth::guard();
 }
logout的具体的执行代码如下,别问我怎么找到的,PHPStorm的全项目文本搜索不解释:\Illuminate\Auth\SessionGuard.php:



public function logout()
 {
  $user = $this->user();
 
  $this->clearUserDataFromStorage();
 
  if (! is_null($this->user)) {
   $this->cycleRememberToken($user);
  }
 
  if (isset($this->events)) {
   $this->events->dispatch(new Events\Logout($user));
  }
 
  // Once we have fired the logout event we will clear the users out of memory
  // so they are no longer available as the user is no longer considered as
  // being signed into this application and should not be available here.
  $this->user = null;
 
  $this->loggedOut = true;
 }


其中牵扯很多,那么我换种角度考虑,假设我们不考虑logout()的具体实现,而是思考如何制作自己的退出设置,那么该如何修改源码呢?好像直接修改成下面的形式就可以了:


public function logout(Request $request)
 {
  Auth::guard()->logout();
 
  $request->session()->invalidate();
  // 自定义重定向地址
  return redirect('/');
 }
其中的很多内容都跟我们的设置无关,全自动的调用,所以我们的退出按钮就只需要运行上述代码即可。本人请测有效。


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