osb/app/Http/Middleware/SetSite.php

<?php

namespace App\Http\Middleware;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\Facades\Config;
use Illuminate\Support\Facades\View;
use Closure;

use App\Models\Site;

/**
 * Class SetSite
 * This class is responsible for setting our site settings based on the URL of a request
 *
 * @package App\Http\Middleware
 */
class SetSite
{
	/**
	 * @param  Request $request
	 * @param  Closure $next
	 * @return mixed
	 */
	public function handle(Request $request,Closure $next)
	{
		$so = new Site;

		if ($so->getTable() AND Schema::hasTable($so->getTable()))
			$so = Site::where('url',$request->root())->single();

		if ($so && ! $so->active)
			abort(404);

		// If we dont exist, we'll return a fake model.
		if (! $so) {
			if ($request->ajax())
				abort(404);

			$so = (new Site);
		}

		// Set who we are in SETUP.
		Config::set('site',$so);
		if (! $request->ajax())
			View::share('site',$so);

		return $next($request);
	}
}