laravel8 - 为什么我的 $request 总是返回 false

Question

I'm trying to practice about middleware in Laravel 8, I created Middleware file by terminal, registed file in Kernel and call middleware in route but the problem is when i try to pass paremeter from url by localhost:8000/admin/?user=admin it's always redirect to the about page

Here's my middleware code, it's CheckAdmin.php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;

class CheckAdmin
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        if($request->user == 'admin'){
            return redirect('/admin');
        } else {
            return redirect('/about');
        }
       return $next($request);
    }
}

Here's Karnel.php

namespace App\Http;

use Illuminate\Foundation\Http\Kernel as HttpKernel;

class Kernel extends HttpKernel
{
    /**
     * The application's global HTTP middleware stack.
     *
     * These middleware are run during every request to your application.
     *
     * @var array
     */
    protected $middleware = [
        // \App\Http\Middleware\TrustHosts::class,
        \App\Http\Middleware\TrustProxies::class,
        \Fruitcake\Cors\HandleCors::class,
        \App\Http\Middleware\PreventRequestsDuringMaintenance::class,
        \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
        \App\Http\Middleware\TrimStrings::class,
        \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
    ];

    /**
     * The application's route middleware groups.
     *
     * @var array
     */
    protected $middlewareGroups = [
        'web' => [
            \App\Http\Middleware\EncryptCookies::class,
            \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
            \Illuminate\Session\Middleware\StartSession::class,
            // \Illuminate\Session\Middleware\AuthenticateSession::class,
            \Illuminate\View\Middleware\ShareErrorsFromSession::class,
            \App\Http\Middleware\VerifyCsrfToken::class,
            \Illuminate\Routing\Middleware\SubstituteBindings::class,
        ],

        'api' => [
            // \Laravel\Sanctum\Http\Middleware\EnsureFrontendRequestsAreStateful::class,
            'throttle:api',
            \Illuminate\Routing\Middleware\SubstituteBindings::class,
        ],
    ];

    /**
     * The application's route middleware.
     *
     * These middleware may be assigned to groups or used individually.
     *
     * @var array
     */
    protected $routeMiddleware = [
        'auth' => \App\Http\Middleware\Authenticate::class,
        'auth.basic' => \Illuminate\Auth\Middleware\AuthenticateWithBasicAuth::class,
        'cache.headers' => \Illuminate\Http\Middleware\SetCacheHeaders::class,
        'can' => \Illuminate\Auth\Middleware\Authorize::class,
        'guest' => \App\Http\Middleware\RedirectIfAuthenticated::class,
        'password.confirm' => \Illuminate\Auth\Middleware\RequirePassword::class,
        'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
        'throttle' => \Illuminate\Routing\Middleware\ThrottleRequests::class,
        'verified' => \Illuminate\Auth\Middleware\EnsureEmailIsVerified::class,
        'CheckAdmin' => \App\Http\Middleware\CheckAdmin::class
    ];
}

Here's web.php

use App\Http\Controllers\AboutController;
use App\Http\Controllers\AdminController;
use App\Http\Controllers\MemberController;
use App\Http\Middleware\CheckAdmin;
use Illuminate\Support\Facades\Route;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function () {
    return view('welcome');
});

Route::get('/about', [AboutController::class, 'index']);
Route::get('/admin', [AdminController::class, 'index'])->middleware('CheckAdmin');
Route::get('/member', [MemberController::class, 'index']);

Answer 1

The method user is reserved in the request:

$request->user() //returns an instance of the authenticated user

Also, setting admin as a url parameter is unsafe, everyone can add that to the url to become an admin, you should rather work with tokens or with dedicated columns/ tables in the database to verify an admin,

Answer 2

You should check the below condition in your AdminController, not in the middleware

if($request->user == 'admin'){
            return redirect('/admin');
        } else {
            return redirect('/about');
        }