ContentHubAccess.php in Acquia Content Hub 8

Namespace

Drupal\acquia_contenthub\Access

File

src/Access/ContentHubAccess.php

<?php

namespace Drupal\acquia_contenthub\Access;

use Drupal\acquia_contenthub\Client\ClientManagerInterface;
use Drupal\acquia_contenthub\ContentHubSubscription;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Logger\LoggerChannelFactoryInterface;
use Drupal\Core\Routing\Access\AccessInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Route;

/**
 * Implements permission to prevent unauthorized access to Entity CDF.
 */
class ContentHubAccess implements AccessInterface {

  /**
   * Logger.
   *
   * @var \Drupal\Core\Logger\LoggerChannelFactoryInterface
   */
  protected $loggerFactory;

  /**
   * Content Hub Client Manager.
   *
   * @var \Drupal\acquia_contenthub\Client\ClientManager
   */
  protected $clientManager;

  /**
   * Content Hub Subscription.
   *
   * @var \Drupal\acquia_contenthub\ContentHubSubscription
   */
  protected $contentHubSubscription;

  /**
   * Constructs an ContentEntityNormalizer object.
   *
   * @param \Drupal\Core\Logger\LoggerChannelFactoryInterface $logger_factory
   *   The logger factory.
   * @param \Drupal\acquia_contenthub\Client\ClientManagerInterface $client_manager
   *   The client manager.
   * @param \Drupal\acquia_contenthub\ContentHubSubscription $contenthub_subscription
   *   The Content Hub Subscription.
   */
  public function __construct(LoggerChannelFactoryInterface $logger_factory, ClientManagerInterface $client_manager, ContentHubSubscription $contenthub_subscription) {
    $this->loggerFactory = $logger_factory;
    $this->clientManager = $client_manager;
    $this->contentHubSubscription = $contenthub_subscription;
  }

  /**
   * Checks access to Entity CDF.
   *
   * Only grants access to logged in users with 'Administer Acquia Content Hub'
   * permission or if the request verifies its HMAC signature.
   *
   * @param \Symfony\Component\Routing\Route $route
   *   The route object to process.
   * @param \Symfony\Component\HttpFoundation\Request $request
   *   The HTTP request object.
   * @param \Drupal\Core\Session\AccountInterface $account
   *   Run access checks for this account.
   *
   * @return bool
   *   TRUE if granted access, FALSE otherwise.
   */
  public function access(Route $route, Request $request, AccountInterface $account) {

    // Check permissions and combine that with any custom access checking
    // needed. Pass forward parameters from the route and/or request as needed.
    if ($account
      ->hasPermission('administer acquia content hub')) {

      // If this is a logged in user with 'Administer Acquia Content Hub'
      // permission then grant access.
      return AccessResult::allowed();
    }
    else {
      if (empty($this->clientManager
        ->isConnected())) {
        $this->loggerFactory
          ->get('acquia_contenthub')
          ->debug('Access denied: Acquia Content Hub Client not connected.');
        return AccessResult::forbidden('Acquia Content Hub Client not connected.');
      }

      // If this user has no permission, then validate Request Signature.
      $headers = array_map('current', $request->headers
        ->all());
      $authorization_header = isset($headers['authorization']) ? $headers['authorization'] : '';
      $shared_secret = $this->contentHubSubscription
        ->getSharedSecret();
      $signature = $this->clientManager
        ->getRequestSignature($request, $shared_secret);
      $authorization = 'Acquia ContentHub:' . $signature;

      // Log debug information if validation fails.
      if ($authorization !== $authorization_header) {
        $this->loggerFactory
          ->get('acquia_contenthub')
          ->debug('HMAC validation failed. [authorization = %authorization]. [authorization_header = %authorization_header]', [
          '%authorization' => $authorization,
          '%authorization_header' => $authorization_header,
        ]);
      }

      // Only allow access if the Signature validates.
      return AccessResult::allowedIf($authorization === $authorization_header);
    }
  }

}

Classes

Name	Description
ContentHubAccess	Implements permission to prevent unauthorized access to Entity CDF.