Laravel 中间件

Laravel 中间件提供了一种方便的机制来过滤进入应用的 HTTP 请求

1.使用中件间

　在路由器中使用中间件：

Route::get('/', 'IndexController@index')->middleware('auth');

//使用多个中间件

Route::get('/', function () {  // })->middleware('first', 'second');

//指定类名

Route::get('admin/profile', function () {  // })->middleware(CheckAge::class);

//路由器组使用中间件，需要注册中间件 在app/http/kernel.php 的 $routeMiddleware 属性中：

Route::group(['middleware' => ['auth']], function () {  // });

//中间件组

//Laravel 带有开箱即用的 web 和 api 中间件，包含了可能应用到 Web UI 和 API 路由的通用中间件：

Route::get('/', function () {  // })->middleware('web'); Route::group(['middleware' => ['web']], function () {  // });

//注：配置中间件组wed,api, 在 app/http/kernel.php 的 $middlewareGroups 属性中

  在控制器中使用中间件：

public function __construct()
    {
        $this->middleware('auth');

        $this->middleware('log')->only('index');

        $this->middleware('subscribed')->except('store');
    }

 2.创建中间件

 中间件在 app/Http/Middleware 目录内  新建类 

namespace App\Http\Middleware;

use Closure;

class className
{
    /**
     * 处理传入的请求
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        return $next($request);
    }

}

 3.注册中间件 

在 App\Http\Kernel 类内

protected $routeMiddleware = [
    'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
    'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
    'bindings' => \Illuminate\Routing\Middleware\SubstituteBindings::class,
    'can' => \Illuminate\Auth\Middleware\Authorize::class,
    'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
    'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
];

 4.中间件的参数

     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next,$role)
    {
        return $next($request);
    }

//使用中间件传参数

Route::get('/', function () {  // })->middleware('first:role');