Laravel 中间件：高效获取路由的最后一个动态参数

php artisan make:middleware GetLastRouteParameter

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\Response;

class GetLastRouteParameter
{
    /**
     * 处理传入的请求。
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function handle(Request $request, Closure $next): Response
    {
        $segments = $request->segments(); // 获取所有路由段

        $lastParameter = null;
        if (!empty($segments)) {
            $lastParameter = end($segments); // 获取最后一个参数
        }

        // 可以在此处对 $lastParameter 进行逻辑处理
        // 例如，根据最后一个参数进行权限检查、数据记录或重定向
        if ($lastParameter === 'forbidden_value') {
            // 示例：如果最后一个参数是 'forbidden_value'，则阻止访问
            abort(403, 'Unauthorized access to this specific value.');
        }

        // 示例：将获取到的参数添加到请求中，以便后续控制器或视图使用
        $request->merge(['last_route_segment' => $lastParameter]);

        // 示例：记录日志
        \Log::info('请求路径的最后一个参数是: ' . ($lastParameter ?? '无'));

        return $next($request);
    }
}

// app/Http/Kernel.php

protected $middlewareAliases = [
    // ... 其他别名
    'get.last.param' => \App\Http\Middleware\GetLastRouteParameter::class,
];

// routes/web.php

use App\Http\Controllers\HomeController;
use Illuminate\Support\Facades\Route;

Route::middleware('get.last.param')->group(function () {
    Route::get('/home/profile/{value?}', function (Request $request) {
        return "Profile Page. Last segment: " . $request->input('last_route_segment');
    });

    Route::get('/home/setting/item/{value?}', function (Request $request) {
        return "Setting Item Page. Last segment: " . $request->input('last_route_segment');
    });

    Route::get('/home/{value?}', function (Request $request) {
        return "Home Page. Last segment: " . $request->input('last_route_segment');
    });

    Route::get('/another/path/{value?}', function (Request $request) {
        return "Another Path Page. Last segment: " . $request->input('last_route_segment');
    });

    // 测试 'forbidden_value'
    Route::get('/restricted/value/{value}', function (Request $request) {
        return "You reached the restricted page. Last segment: " . $request->input('last_route_segment');
    });
});

// 测试根路径或无参数情况
Route::get('/', function (Request $request) {
    return "Root Page. Last segment: " . ($request->input('last_route_segment') ?? 'N/A');
})->middleware('get.last.param');