如何在AuthServiceProvider中返回json响应？

Question

我在Firebase JWT项目中使用了Lumen，但是我不确定在令牌无效时是否返回自定义json响应。我正在使用默认的Authenticate.php中间件。

我不知道我该使用中间件还是像throw new Exception('token not provided');这样的异常？

AuthServiceProvider.php （下面是我当前的代码）是解码令牌的好地方吗？

<?php

namespace App\Providers;

use App\User;
use Illuminate\Support\ServiceProvider;
use Firebase\JWT\JWT;
use Firebase\JWT\ExpiredException;
use Exception;

class AuthServiceProvider extends ServiceProvider
{
    /**
     * Boot the authentication services for the application.
     *
     * @return void
     */
    public function boot()
    {
        // Here you may define how you wish users to be authenticated for your Lumen
        // application. The callback which receives the incoming request instance
        // should return either a User instance or null. You're free to obtain
        // the User instance via an API token or any other method necessary.

        $this->app['auth']->viaRequest('api', function ($request) {
            $token = $request->bearerToken();

            if(!$token) {
                // Unauthorized response if token not there
                throw new Exception('token not provided');
            }

            try {
                $credentials = JWT::decode($token, env('JWT_SECRET'), ['HS256']);
            } catch(ExpiredException $e) {
                return response()->json([
                    'error' => 'token expired'
                ], 400);
            } catch(Exception $e) {
                return response()->json([
                    'error' => 'token error'
                ], 400);
            }

            return User::find($credentials->sub);
        });
    }
}