laravel/app/Http/Middleware/Authenticate.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\Auth;
use Illuminate\Auth\AuthenticationException;

class Authenticate
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @param  string  ...$guards
     * @return mixed
     *
     * @throws \Illuminate\Auth\AuthenticationException
     */
    public function handle($request, Closure $next, ...$guards)
    {
        $this->authenticate($guards);

        return $next($request);
    }

    /**
     * Determine if the user is logged in to any of the given guards.
     *
     * @param  array  $guards
     * @return void
     *
     * @throws \Illuminate\Auth\AuthenticationException
     */
    protected function authenticate(array $guards)
    {
        if (count($guards) <= 1) {
            Auth::guard(array_first($guards))->authenticate();

            return Auth::shouldUse($guard);
        }

        foreach ($guards as $guard) {
            if (Auth::guard($guard)->check()) {
                return Auth::shouldUse($guard);
            }
        }

        throw new AuthenticationException;
    }
}