# Middlewares usage crash course

### How to create and enable new one:

1. Ensure PSR15 compatibility (implement `\Psr\Http\Server\MiddlewareInterface`)
2. Ensure it's accessible with ServiceManager (extends `ConfigurableService`)
3. To activate please refer `\oat\tao\model\Middleware\MiddlewareManager::append`
4. To deactivate `\oat\tao\model\Middleware\MiddlewareManager::detach`

NB: Currently, middlewares can be attached only to the static routes

#### Sample

```injectablephp
class MyNewMiddleware extends ConfigurableService implements MiddlewareInterface 
{ 
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface { 
        // My middleware logic here...
        return $handler->handle($request);
    } 
}

$this->getServiceManager()->get(MiddlewareManager::class)
            ->append( new MiddlewareContext(
            [
                MiddlewareContext::PARAM_ROUTE => '/http/uri',
                MiddlewareContext::PARAM_MIDDLEWARE_ID => MyNewMiddleware::class
            ]
        ));
```