Laravel5.1框架注册中间件的三种场景详解

本文实例讲述了Laravel5.1框架注册中间件的三种场景。分享给大家供大家参考，具体如下：

在Laravel中注册中间件主要有三种场景，一种给控制器中的方法进行注册，一种是给整个控制器进行注册，最后一种是给全局注册中间件。

1、在控制器中的方法中注册中间件

这种需求是最为常见，这个例子是给IndexController中的index方法添加中间件。

Route::get('/', ['middleware'= ['AppHttpMiddlewareEmailMiddleware'],'uses'= 'IndexController@index']);

2、在整个控制器中注册中间件

这种需求有的时候也会出现，如果给整个控制器中注册中间件，那么这个控制器中的所有方法都注册了该中间件。跟我一起来找到答案！

控制器基类（Controller.php）

首先来看一下控制器基类，可以看到Controller类继承了BaseController类，而BaseController的路径是IlluminateRoutingController，然后我们来看看Laravel的源码。

<?php
namespace AppHttpControllers;
use IlluminateFoundationBusDispatchesJobs;
use IlluminateRoutingController as BaseController;
use IlluminateFoundationValidationValidatesRequests;
use IlluminateFoundationAuthAccessAuthorizesRequests;
abstract class Controller extends BaseController
{
  use AuthorizesRequests, DispatchesJobs, ValidatesRequests;
}

BaseController类

从源码中我们可以看到有一个属性为middleware，这个middleware属性就是我们要找的，所以只要在需要注册的控制器下使用这个属性即可完成注册。

protected $middleware = [];

<?php
namespace IlluminateRouting;
use BadMethodCallException;
use SymfonyComponentHttpKernelExceptionNotFoundHttpException;
abstract class Controller
{
  /**
   * The middleware registered on the controller.
   *
   * @var array
   */
  protected $middleware = [];
  /**
   * Register middleware on the controller.
   *
   * @param array|string|Closure $middleware
   * @param array  $options
   * @return IlluminateRoutingControllerMiddlewareOptions
   */
  public function middleware($middleware, array $options = [])
  {
    foreach ((array) $middleware as $m) {
      $this- middleware[] = [
        'middleware' =  $m,
        'options' =  &$options,
      ];
    }
    return new ControllerMiddlewareOptions($options);
  }
  /**
   * Get the middleware assigned to the controller.
   *
   * @return array
   */
  public function getMiddleware()
  {
    return $this- middleware;
  }
  /**
   * Execute an action on the controller.
   *
   * @param string $method
   * @param array  $parameters
   * @return SymfonyComponentHttpFoundationResponse
   */
  public function callAction($method, $parameters)
  {
    return call_user_func_array([$this, $method], $parameters);
  }
  /**
   * Handle calls to missing methods on the controller.
   *
   * @param array  $parameters
   * @return mixed
   *
   * @throws SymfonyComponentHttpKernelExceptionNotFoundHttpException
   */
  public function missingMethod($parameters = [])
  {
    throw new NotFoundHttpException('Controller method not found.');
  }
  /**
   * Handle calls to missing methods on the controller.
   *
   * @param string $method
   * @param array  $parameters
   * @return mixed
   *
   * @throws BadMethodCallException
   */
  public function __call($method, $parameters)
  {
    throw new BadMethodCallException("Method [{$method}] does not exist.");
  }

给整个控制器注册中间件

我们选用系统的Authenticate中间件来举例，这个中间件是用于检测用户是否登录。

注意：中间件的名称为键，值可以是一个空数组

protected $middleware = ['AppHttpMiddlewareAuthenticate'= []];

3、全局注册中间件

打开app/Http/Kernel.php，这是一个内核文件，可以看到一个属性middleware，我们只需要将我们自定义的中间件的路径添加到这个middleware 这个属性中即可。

此外还有一个$routeMiddleware属性，使用这个属性可以根据路由来注册中间件。我们的路由有：goods/info，goods/detail两个路由器我们可以将$routeMiddleware属性添加一行

'goods.*' =  AppHttpMiddlewareGoodsMiddleware::class,

<?php
namespace AppHttp;
use IlluminateFoundationHttpKernel as HttpKernel;
class Kernel extends HttpKernel
{
  /**
   * The application's global HTTP middleware stack.
   *
   * @var array
   */
  protected $middleware = [
    IlluminateFoundationHttpMiddlewareCheckForMaintenanceMode::class,
    AppHttpMiddlewareEncryptCookies::class,
    IlluminateCookieMiddlewareAddQueuedCookiesToResponse::class,
    IlluminateSessionMiddlewareStartSession::class,
    IlluminateViewMiddlewareShareErrorsFromSession::class,
    AppHttpMiddlewareVerifyCsrfToken::class,
  ];
  /**
   * The application's route middleware.
   *
   * @var array
   */
  protected $routeMiddleware = [
    'auth' =  AppHttpMiddlewareAuthenticate::class,
    'auth.basic' =  IlluminateAuthMiddlewareAuthenticateWithBasicAuth::class,
    'guest' =  AppHttpMiddlewareRedirectIfAuthenticated::class,
  ];
}