public function execute()
 {
     $params = $this->extractRequestParams();
     $this->requireOnlyOneParameter($params, 'url', 'list');
     $flickrBlacklist = new UploadWizardFlickrBlacklist(UploadWizardConfig::getConfig(), $this->getContext());
     if ($params['list']) {
         $list = $flickrBlacklist->getBlacklist();
         $this->getResult()->setIndexedTagName($list, 'item');
         $this->getResult()->addValue('flickrblacklist', 'list', $list);
     }
     if (!is_null($params['url'])) {
         if ($flickrBlacklist->isBlacklisted($params['url'])) {
             $this->getResult()->addValue('flickrblacklist', 'result', 'bad');
         } else {
             $this->getResult()->addValue('flickrblacklist', 'result', 'ok');
         }
     }
 }
 /**
  * Hook to blacklist flickr images by intercepting upload from url
  */
 public static function onIsUploadAllowedFromUrl($url, &$allowed)
 {
     if ($allowed) {
         $flickrBlacklist = new UploadWizardFlickrBlacklist(UploadWizardConfig::getConfig(), RequestContext::getMain());
         if ($flickrBlacklist->isBlacklisted($url)) {
             $allowed = false;
         }
     }
     return true;
 }