WebprofilerEventSubscriber.php in Devel 8

Namespace

Drupal\webprofiler\EventSubscriber

File

webprofiler/src/EventSubscriber/WebprofilerEventSubscriber.php

<?php

namespace Drupal\webprofiler\EventSubscriber;

use Drupal\Core\Render\RendererInterface;
use Drupal\Core\Routing\UrlGeneratorInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * Class WebprofilerEventSubscriber
 */
class WebprofilerEventSubscriber implements EventSubscriberInterface {

  /**
   * @var \Drupal\Core\Session\AccountInterface
   */
  private $currentUser;

  /**
   * @var \Drupal\Core\Routing\UrlGeneratorInterface
   */
  protected $urlGenerator;

  /**
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

  /**
   * @param \Drupal\Core\Session\AccountInterface $currentUser
   * @param \Drupal\Core\Routing\UrlGeneratorInterface $urlGenerator
   * @param \Drupal\Core\Render\RendererInterface $renderer
   */
  public function __construct(AccountInterface $currentUser, UrlGeneratorInterface $urlGenerator, RendererInterface $renderer) {
    $this->currentUser = $currentUser;
    $this->urlGenerator = $urlGenerator;
    $this->renderer = $renderer;
  }

  /**
   * @param \Symfony\Component\HttpKernel\Event\FilterResponseEvent $event
   */
  public function onKernelResponse(FilterResponseEvent $event) {
    $response = $event
      ->getResponse();
    $request = $event
      ->getRequest();
    if ($response->headers
      ->has('X-Debug-Token') && NULL !== $this->urlGenerator) {
      $response->headers
        ->set('X-Debug-Token-Link', $this->urlGenerator
        ->generate('webprofiler.dashboard', [
        'profile' => $response->headers
          ->get('X-Debug-Token'),
      ]));
    }

    // do not capture redirects or modify XML HTTP Requests
    if ($request
      ->isXmlHttpRequest()) {
      return;
    }
    if ($this->currentUser
      ->hasPermission('view webprofiler toolbar')) {
      $this
        ->injectToolbar($response);
    }
  }

  /**
   * @param \Symfony\Component\HttpFoundation\Response $response
   */
  protected function injectToolbar(Response $response) {
    $content = $response
      ->getContent();
    $pos = mb_strripos($content, '</body>');
    if (FALSE !== $pos) {
      if ($token = $response->headers
        ->get('X-Debug-Token')) {
        $loader = [
          '#theme' => 'webprofiler_loader',
          '#token' => $token,
          '#profiler_url' => $this->urlGenerator
            ->generate('webprofiler.toolbar', [
            'profile' => $token,
          ]),
        ];
        $content = mb_substr($content, 0, $pos) . $this->renderer
          ->renderRoot($loader) . mb_substr($content, $pos);
        $response
          ->setContent($content);
      }
    }
  }

  /**
   * @return array
   */
  public static function getSubscribedEvents() {
    return [
      KernelEvents::RESPONSE => [
        'onKernelResponse',
        -128,
      ],
    ];
  }

}

Classes

Name	Description
WebprofilerEventSubscriber	Class WebprofilerEventSubscriber