Dynamic middleware for laravel 5 - laravel

Question

While building multi-tenancy packages for Laravel 5 I had to find out how to add middleware dynamically from code. In comparison to this question on SO I do not want to touch the Http/Kernel definitions.
During application initialization I check whether the requested hostname is known in the database and whether this hostname requires a redirect to a primary hostname or ssl.
Because you don't want to touch the Http/Kernel as a package, we need to use the service provider.
Requirements:
dynamically add middleware without touching Http/Kernel
use service provider and response object instead of "hacks"

Answer 1

The solution is to dynamically register the middleware in the kernel. First write your middleware, for instance:
<?php namespace HynMe\MultiTenant\Middleware;
use App;
use Closure;
use Illuminate\Contracts\Routing\Middleware;
class HostnameMiddleware implements Middleware
{
public function handle($request, Closure $next)
{
/* #var \HynMe\MultiTenant\Models\Hostname */
$hostname = App::make('HynMe\Tenant\Hostname');
if(!is_null($redirect = $hostname->redirectActionRequired()))
return $redirect;
return $next($request);
}
}
Now in your service provider use the following code in the boot() method to add this middleware to the Kernel:
$this->app->make('Illuminate\Contracts\Http\Kernel')->prependMiddleware('HynMe\MultiTenant\Middleware\HostnameMiddleware');
To answer what redirectActionRequired() method does in the hostname object:
/**
* Identifies whether a redirect is required for this hostname
* #return \Illuminate\Http\RedirectResponse|null
*/
public function redirectActionRequired()
{
// force to new hostname
if($this->redirect_to)
return $this->redirectToHostname->redirectActionRequired();
// #todo also add ssl check once ssl certificates are support
if($this->prefer_https && !Request::secure())
return redirect()->secure(Request::path());
// if default hostname is loaded and this is not the default hostname
if(Request::getHttpHost() != $this->hostname)
return redirect()->away("http://{$this->hostname}/" . (Request::path() == '/' ? null : Request::path()));
return null;
}
If you need to dynamically register routeMiddleware use the following in your service provider;
$this->app['router']->middleware('shortname', Vendor\Some\Class::class);
Please add comments if you have questions about this implementation.