invoiceninja/app/Http/Middleware/SessionDomains.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://www.elastic.co/licensing/elastic-license
 */

namespace App\Http\Middleware;

use App\Utils\Ninja;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cookie;

class SessionDomains
{
    /**
     * Handle an incoming request.
     *
     * @param  Request  $request
     * @param  Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {

        if(Ninja::isSelfHost())
            return $next($request);

        $domain_name = $request->getHost();

        if (strpos($domain_name, 'invoicing.co') !== false) 
        {
            config(['session.domain' => '.invoicing.co']);
        }            
        else{

            Cookie::queue(Cookie::forget('invoice_ninja_session', '/'));

            config(['session.domain' => $domain_name]);
            
        }
        
        return $next($request);        
    }
}