laravel中间件Middleware原理解析及实例

一、总结

一句话总结：

二、laravel中间件Middleware原理解析

1、身份中间件实例

legend3/app/Http/Middleware/Home/User.php

这是写的中间件的代码，逻辑就是判断用户是否登录，没登录就退出

 1 <?php
 2 
 3 namespace AppHttpMiddlewareHome;
 4 
 5 use Closure;
 6 use Auth;
 7 
 8 class User
 9 {
10     /**
11      * Handle an incoming request.
12      *
13      * @param  IlluminateHttpRequest  $request
14      * @param  Closure  $next
15      * @return mixed
16      */
17     public function handle($request, Closure $next)
18     {
19         //前端的登录中间件
20         //作用是用Auth::guard('user')->check()来验证用户登录，
21         //如果登录成功就进行下一步
22         //如果没有登录成功就返回到登录页
23         if(!Auth::guard('user')->check()){
24             return redirect('/login');
25         }
26         return $next($request);
27     }
28 }

legend3/app/Http/Kernel.php

这里是注册中间件，相当于给中间件取别名，使用的时候可以直接通过别名调用

 1     protected $routeMiddleware = [
 2         //fry
 3         //后端的登录中间件注册
 4         'admin.auth'=>MiddlewareAdminAdmin::class,
 5         //前端的登录中间件注册
 6         'home.auth'=>MiddlewareHomeUser::class,
 7 
 8         //
 9 
10         'auth' => AppHttpMiddlewareAuthenticate::class,
11         'auth.basic' => IlluminateAuthMiddlewareAuthenticateWithBasicAuth::class,
12         'bindings' => IlluminateRoutingMiddlewareSubstituteBindings::class,
13         'cache.headers' => IlluminateHttpMiddlewareSetCacheHeaders::class,
14         'can' => IlluminateAuthMiddlewareAuthorize::class,
15         'guest' => AppHttpMiddlewareRedirectIfAuthenticated::class,
16         'signed' => IlluminateRoutingMiddlewareValidateSignature::class,
17         'throttle' => IlluminateRoutingMiddlewareThrottleRequests::class,
18         'verified' => IlluminateAuthMiddlewareEnsureEmailIsVerified::class,
19     ];

在配置文件auth中注册guard

如果使用Auth::guard('user')->check()
中的guard，就需要注册guard

如果只是作为普通中间件使用，不使用guard，就不需要

例如$this->middleware('home.auth')->except(['index','get_video_comment']);

使用

在各个控制器中

class VideoController extends Controller
{
    public function __construct()
    {
        //排除'index'方法，进行中间件的验证
        $this->middleware('home.auth')->except(['index','get_video_comment']);
//        $this->middleware('home.auth')->except(['get_video_comment']);
    }
    省略若干代码...
}