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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\View\Strategy;
use Zend\EventManager\AbstractListenerAggregate;
use Zend\EventManager\EventManagerInterface;
use Zend\View\Model;
use Zend\View\Renderer\JsonRenderer;
use Zend\View\ViewEvent;
class JsonStrategy extends AbstractListenerAggregate
{
/**
* Character set for associated content-type
*
* @var string
*/
protected $charset = 'utf-8';
/**
* Multibyte character sets that will trigger a binary content-transfer-encoding
*
* @var array
*/
protected $multibyteCharsets = array(
'UTF-16',
'UTF-32',
);
/**
* @var JsonRenderer
*/
protected $renderer;
/**
* Constructor
*
* @param JsonRenderer $renderer
*/
public function __construct(JsonRenderer $renderer)
{
$this->renderer = $renderer;
}
/**
* {@inheritDoc}
*/
public function attach(EventManagerInterface $events, $priority = 1)
{
$this->listeners[] = $events->attach(ViewEvent::EVENT_RENDERER, array($this, 'selectRenderer'), $priority);
$this->listeners[] = $events->attach(ViewEvent::EVENT_RESPONSE, array($this, 'injectResponse'), $priority);
}
/**
* Set the content-type character set
*
* @param string $charset
* @return JsonStrategy
*/
public function setCharset($charset)
{
$this->charset = (string) $charset;
return $this;
}
/**
* Retrieve the current character set
*
* @return string
*/
public function getCharset()
{
return $this->charset;
}
/**
* Detect if we should use the JsonRenderer based on model type and/or
* Accept header
*
* @param ViewEvent $e
* @return null|JsonRenderer
*/
public function selectRenderer(ViewEvent $e)
{
$model = $e->getModel();
if (!$model instanceof Model\JsonModel) {
// no JsonModel; do nothing
return;
}
// JsonModel found
return $this->renderer;
}
/**
* Inject the response with the JSON payload and appropriate Content-Type header
*
* @param ViewEvent $e
* @return void
*/
public function injectResponse(ViewEvent $e)
{
$renderer = $e->getRenderer();
if ($renderer !== $this->renderer) {
// Discovered renderer is not ours; do nothing
return;
}
$result = $e->getResult();
if (!is_string($result)) {
// We don't have a string, and thus, no JSON
return;
}
// Populate response
$response = $e->getResponse();
$response->setContent($result);
$headers = $response->getHeaders();
if ($this->renderer->hasJsonpCallback()) {
$contentType = 'application/javascript';
} else {
$contentType = 'application/json';
}
$contentType .= '; charset=' . $this->charset;
$headers->addHeaderLine('content-type', $contentType);
if (in_array(strtoupper($this->charset), $this->multibyteCharsets)) {
$headers->addHeaderLine('content-transfer-encoding', 'BINARY');
}
}
}
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