ZF\Apigility\Admin\Controller\AuthenticationController::authVersion1 PHP Method

    protected function authVersion1(Request $request)
    {
        switch ($request->getMethod()) {
            case $request::METHOD_GET:
                $entity = $this->model->fetch();
                if (!$entity) {
                    $response = $this->getResponse();
                    $response->setStatusCode(204);
                    return $response;
                }
                break;
            case $request::METHOD_POST:
                $entity = $this->model->create($this->bodyParams());
                $response = $this->getResponse();
                $response->setStatusCode(201);
                $response->getHeaders()->addHeaderLine('Location', $this->plugin('Hal')->createLink($this->getRouteForEntity($entity)));
                break;
            case $request::METHOD_PATCH:
                $entity = $this->model->update($this->bodyParams());
                break;
            case $request::METHOD_DELETE:
                if ($this->model->remove()) {
                    return $this->getResponse()->setStatusCode(204);
                }
                return new ApiProblemResponse(new ApiProblem(404, 'No authentication configuration found'));
            default:
                return new ApiProblemResponse(new ApiProblem(405, 'Only the methods GET, POST, PATCH, and DELETE are allowed for this URI'));
        }
        $halEntity = new Entity($entity, null);
        $halEntity->getLinks()->add(Link::factory(['rel' => 'self', 'route' => $this->getRouteForEntity($entity)]));
        return new ViewModel(['payload' => $halEntity]);
    }