GuessModule middleware to guess the Caffeinated/Module based on the request subdomain. Developed for the Caffeinated/Modules package, Laravel 5.x

GuessModule.php

<?php

namespace App\Http\Middleware;

use Caffeinated\Modules\Modules;
use Closure;

class GuessModule
{
    /**
     * @var Caffeinated\Modules
     */
    protected $modules;

    /**
     * Create a new GuessModule instance.
     *
     * @param Caffeinated\Modules $module
     */
    public function __construct(Modules $modules)
    {
        $this->modules = $modules;
    }

    /**
     *  Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if ($request->session()->has('module')) {
            // Clear any flashed data from previous request
            $request->session()->forget('module');
        }

        $module = $this->modules->where('slug', explode(".", $request->server()['HTTP_HOST'], 2)[0]);
        if (!$module->isEmpty()) {
            $request->session()->flash('module', $module);
        }
        return $next($request);
    }
}