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<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\Tracker\Visit;
use Piwik\Cache;
use Piwik\Common;
use Piwik\Option;
use Piwik\Tracker\Request;
/**
* Filters out tracking requests issued by spammers.
*/
class ReferrerSpamFilter
{
const OPTION_STORAGE_NAME = 'referrer_spam_blacklist';
/**
* @var string[]
*/
private $spammerList;
/**
* Check if the request is from a known spammer host.
*
* @param Request $request
* @return bool
*/
public function isSpam(Request $request)
{
$spammers = $this->getSpammerListFromCache();
$referrerUrl = $request->getParam('urlref');
foreach ($spammers as $spammerHost) {
if (stripos($referrerUrl, $spammerHost) !== false) {
Common::printDebug('Referrer URL is a known spam: ' . $spammerHost);
return true;
}
}
return false;
}
private function getSpammerListFromCache()
{
$cache = Cache::getEagerCache();
$cacheId = 'ReferrerSpamFilter-' . self::OPTION_STORAGE_NAME;
if ($cache->contains($cacheId)) {
$list = $cache->fetch($cacheId);
} else {
$list = $this->loadSpammerList();
$cache->save($cacheId, $list);
}
if(!is_array($list)) {
Common::printDebug('Warning: could not read list of spammers from cache.');
return array();
}
return $list;
}
private function loadSpammerList()
{
if ($this->spammerList !== null) {
return $this->spammerList;
}
// Read first from the auto-updated list in database
$list = Option::get(self::OPTION_STORAGE_NAME);
if ($list) {
$this->spammerList = unserialize($list);
} else {
// Fallback to reading the bundled list
$file = PIWIK_VENDOR_PATH . '/piwik/referrer-spam-blacklist/spammers.txt';
$this->spammerList = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
}
return $this->spammerList;
}
}
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