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<?php
declare(strict_types=1);
namespace Laminas\View\Strategy;
use Laminas\EventManager\AbstractListenerAggregate;
use Laminas\EventManager\EventManagerInterface;
use Laminas\Feed\Writer\Feed;
use Laminas\View\Model;
use Laminas\View\Renderer\FeedRenderer;
use Laminas\View\ViewEvent;
use function is_string;
class FeedStrategy extends AbstractListenerAggregate
{
/** @var FeedRenderer */
protected $renderer;
public function __construct(FeedRenderer $renderer)
{
$this->renderer = $renderer;
}
/**
* {@inheritDoc}
*
* @param int $priority
*/
public function attach(EventManagerInterface $events, $priority = 1)
{
$this->listeners[] = $events->attach(ViewEvent::EVENT_RENDERER, [$this, 'selectRenderer'], $priority);
$this->listeners[] = $events->attach(ViewEvent::EVENT_RESPONSE, [$this, 'injectResponse'], $priority);
}
/**
* Detect if we should use the FeedRenderer based on model type
*
* @return null|FeedRenderer
*/
public function selectRenderer(ViewEvent $e)
{
$model = $e->getModel();
if (! $model instanceof Model\FeedModel) {
// no FeedModel present; do nothing
return;
}
// FeedModel found
return $this->renderer;
}
/**
* Inject the response with the feed payload and appropriate Content-Type header
*
* @return void
*/
public function injectResponse(ViewEvent $e)
{
/** @var FeedRenderer $renderer */
$renderer = $e->getRenderer();
if ($renderer !== $this->renderer) {
// Discovered renderer is not ours; do nothing
return;
}
$result = $e->getResult();
if (! is_string($result) && ! $result instanceof Feed) {
// We don't have a string, and thus, no feed
return;
}
// If the result is a feed, export it
if ($result instanceof Feed) {
$result = $result->export($renderer->getFeedType());
}
// Get the content-type header based on feed type
$feedType = $renderer->getFeedType();
$feedType = 'rss' === $feedType
? 'application/rss+xml'
: 'application/atom+xml';
$model = $e->getModel();
$charset = '';
if ($model instanceof Model\FeedModel) {
$feed = $model->getFeed();
$charset = '; charset=' . (string) $feed->getEncoding() . ';';
}
// Populate response
$response = $e->getResponse();
$response->setContent($result);
$headers = $response->getHeaders();
$headers->addHeaderLine('content-type', $feedType . $charset);
}
}