Login form description in API

login.php

<?php
public function logsinAction()
    {
    	$hypermedia = 'application/vnd.com.doggiiz.api+json';
    	$data = array(
    		'message' => 'Welcome to the login page',
    		'self' => 'http://localhost/~ikwattro/devapp/app_dev.php/front/logsin',
    		'_links' => array(
    			'home' => array(
    				'href' => 'http://localhost/~ikwattro/devapp/app_dev.php/front/logsin',
    				'desc' => 'Return to home page'
    				)
    			),
    		'_actions' => array(
    			'login' => array(
    				'method' => 'POST',
    				'action' => 'http://localhost/~ikwattro/devapp/app_dev.php/front/logsin/verify',
    				'enctype' => null,
    				'fields' => array(
    					'username' => array(
    						'type' => 'text',
    						'required' => true,
    						'name' => 'doggiiz_form_login_username',
    						'label' => 'username'
    						),
    					'password' => array(
    						'type' => 'password',
    						'required' => true,
    						'name' => 'doggiiz_form_login_password',
    						'label' => 'password'
    						),
    					'firstname' => array(
    						'type' => 'text',
    						'required' => false,
    						'name' => 'doggiiz_form_login_firstname',
    						'label' => 'firstname'
    						),
    					'csrf' => array(
    						'type' => 'hidden',
    						'value' => 'fdsFDQSf56',
    						'required' => true,
    						'name' => 'doggiiz_form_login_csrf',
    						)
    					)
    				)
    			)
    		);
    	$json_data = json_encode($data);
        $response = new Response($json_data, 200);
        $response->headers->set('Content-Type', $hypermedia);
        return $response;
    }