Guardian of laravel world-middleware

Middleware can filter requests. Here you can use middleware to verify whether the user is logged in. If the user is logged in, you can continue to perform the original operation. If you are not logged in, you will be redirected. Go to the login page and let the user log in first.

1. Define middleware

## Through

php artsian make:middleware Command to create middleware, file path: app\Http\Middleware\CheckToken.php

php artisan make:middleware CheckToken

<?php
namespace App\Http\Middleware;
use Closure;
use Illuminate\Http\Request;

class CheckToken
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
       //在这里做一个判断，如果token不是 &#39;my-secret-token&#39;，则重定向
       if ($request->input(&#39;token&#39;) !== &#39;my-secret-token&#39;) {
            return redirect(&#39;home&#39;);
        }
        return $next($request);
    }
}

2. Classification of middleware

• Pre-middleware

<?php
namespace App\Http\Middleware;
use Closure;
class BeforeMiddleware
{
    public function handle($request, Closure $next)
    {
         ...
        // 应用请求之前执行一些任务
        return $next($request);
    }
}

• ##Post-middleware

  
  

  <?php
  namespace App\Http\Middleware;
  use Closure;
  class AfterMiddleware
  {
      public function handle($request, Closure $next)
      {
          $response = $next($request);
          // 应用请求之后执行一些任务
          return $response;
      }
  }

3. Use of middleware

• Use middleware globally

  //在app\Http\Kernel.php中的$middleware内添加
   protected $middleware = [
          // \App\Http\Middleware\TrustHosts::class,
          ....
          ....
          \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
          //这是之前定义的
          \App\Http\Middleware\CheckToken::class,
      ];

• Using middleware groups

  //在app\Http\Kernel.php中的$middlewareGroups内添加
    protected $middlewareGroups = [
        'web' => [
             ....
          ],
  
          'api' => [
             ....
          ],
          'diy' =>[
            //可以在web组和api组中添加，也可以自己diy一个
          ]
      ];
  //路由中使用，RouteServiceProvider 默认将 web 和 api 中间件组自动应用到 routes/web.php 和 routes/api.php
  Route::get('/u', function () {
  
  })->middleware('diy');

• Using middleware individually

      protected $routeMiddleware = [
           ...,
           'myself'=> \App\Http\Middleware\CheckToken::class,
          ];
  Route::get('/user', function () {
      //
  })->middleware('myself');

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