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AmpOptimizerSubscriber.php
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AmpOptimizerSubscriber.php
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<?php
namespace Hola\AmpToolboxBundle\EventSubscriber;
use AmpProject\Optimizer\ErrorCollection;
use AmpProject\Optimizer\TransformationEngine;
use Psr\Log\LoggerInterface;
use Sunra\PhpSimple\HtmlDomParser;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
/**
* Listen response event and optimize html
* Class AmpOptimizerSubscriber
* @package Hola\AmpToolboxBundle\EventSubscriber
*/
class AmpOptimizerSubscriber implements EventSubscriberInterface
{
/**
* @var LoggerInterface
*/
private $logger;
/**
* @var TransformationEngine
*/
private $transformationEngine;
/**
* @var array
*/
private $config;
/**
* @var ErrorCollection
*/
private $errorCollection;
/**
* AmpOptimizerSubscriber constructor.
* @param LoggerInterface $logger
* @param TransformationEngine $transformationEngine
* @param $config
*/
public function __construct(LoggerInterface $logger, TransformationEngine $transformationEngine, $config)
{
$this->config = $config;
$this->logger = $logger;
$this->transformationEngine = $transformationEngine;
$this->errorCollection = new ErrorCollection();
}
/**
* @return array|array[]
*/
public static function getSubscribedEvents()
{
return [
KernelEvents::RESPONSE => ['onKernelResponse', -10],
];
}
/**
* @param ResponseEvent $event
* @return void
*/
public function onKernelResponse(ResponseEvent $event): void
{
if (!array_key_exists('transform_enabled', $this->config) ||
false === $this->config['transform_enabled']) {
return;
}
if (!$event->isMasterRequest()) {
return;
}
if (!$this->isAmpHtml($event->getResponse(), $event->getRequest())) {
return;
}
$optimizedHtml = $this->transformationEngine->optimizeHtml(
$event->getResponse()->getContent(),
$this->errorCollection
);
$this->handleErrors();
$event->getResponse()->setContent($optimizedHtml);
}
/**
* @param Response $response
* @param Request $request
* @return bool
*/
private function isAmpHtml(Response $response, Request $request): bool
{
$pathInfo = pathInfo($request->getUri());
if (isset($pathInfo['extension']) && $pathInfo['extension'] !== 'html') {
return false;
}
$contentType = $response->headers->get('Content-type');
if (strpos($contentType, 'text/html') === false) {
return false;
}
$content = $response->getContent();
$dom = HtmlDomParser::str_get_html($content);
$htmlElementAttrs = $dom->find('html', 0)->getAllAttributes();
if (empty(array_intersect(['⚡', 'amp'], array_keys($htmlElementAttrs)))) {
return false;
}
return true;
}
private function handleErrors(): void
{
if ($this->errorCollection->count() > 0) {
foreach ($this->errorCollection as $error) {
$this->logger->error(sprintf(
"AMP-Optimizer Error code: %s\nError Message: %s\n",
$error->getCode(),
$error->getMessage()
));
}
}
}
/**
* @param bool $enabled
*/
public function setEnabled(bool $enabled): void
{
$this->config['transform_enabled'] = $enabled;
}
}