Laravel 将变量从中间件传递到控制器路由

如何将变量从中间件传递到控制器或执行此类中间件的路由？我看到了一些帖子，内容是在请求中添加它，如下所示:

$request->attributes->add(['key' => $value);

还有人建议使用flash:

Session::flash('key', $value);

但我不确定这是否是最佳实践，或者是否有更好的方法来做到这一点？以下是我的中间件和路径:

namespace App\Http\Middleware;

use Closure;

class TwilioWorkspaceCapability
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $workspaceCapability = new \Services_Twilio_TaskRouter_Workspace_Capability("xxxxx", "xxxx", "xxxx");
        $workspaceCapability->allowFetchSubresources();
        $workspaceCapability->allowDeleteSubresources();
        $workspaceCapability->allowUpdatesSubresources();
        $token = $workspaceCapability->generateToken();
        //how do I pass variable $token back to the route that called this middleware
        return $next($request);
    }
}

Route::get('/manage', ['middleware' => 'twilio.workspace.capability', function (Request $request) {
    return view('demo.manage', [
        'manage_link_class' => 'active',
        'twilio_workspace_capability' => //how do I get the token here?...
    ]);
}]);

仅供参考，我之所以决定使用中间件，是因为我计划在令牌的生命周期中缓存令牌，否则这将是一个可怕的实现，因为我会在每次请求时请求一个新令牌.