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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\Plugins\PrivacyManager;
use Piwik\Common;
use Piwik\IP;
/**
* Anonymize visitor IP addresses to comply with the privacy laws/guidelines in countries, such as Germany.
*/
class IPAnonymizer
{
/**
* Internal function to mask portions of the visitor IP address
*
* @param string $ip IP address in network address format
* @param int $maskLength Number of octets to reset
* @return string
*/
public static function applyIPMask($ip, $maskLength)
{
// IPv4 or mapped IPv4 in IPv6
if (IP::isIPv4($ip)) {
$i = strlen($ip);
if ($maskLength > $i) {
$maskLength = $i;
}
while ($maskLength-- > 0) {
$ip[--$i] = chr(0);
}
} else {
$masks = array(
'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
'ffff:ffff:ffff:ffff::',
'ffff:ffff:ffff:0000::',
'ffff:ff00:0000:0000::'
);
$ip = $ip & pack('a16', inet_pton($masks[$maskLength]));
}
return $ip;
}
/**
* Hook on Tracker.Visit.setVisitorIp to anomymize visitor IP addresses
*/
public function setVisitorIpAddress(&$ip)
{
if (!$this->isActive()) {
Common::printDebug("Visitor IP was _not_ anonymized: ". IP::N2P($ip));
return;
}
$originalIp = $ip;
$privacyConfig = new Config();
$ip = self::applyIPMask($ip, $privacyConfig->ipAddressMaskLength);
Common::printDebug("Visitor IP (was: ". IP::N2P($originalIp) .") has been anonymized: ". IP::N2P($ip));
}
/**
* Deactivates IP anonymization. This function will not be called by the Tracker.
*/
public static function deactivate()
{
$privacyConfig = new Config();
$privacyConfig->ipAnonymizerEnabled = false;
}
/**
* Activates IP anonymization. This function will not be called by the Tracker.
*/
public static function activate()
{
$privacyConfig = new Config();
$privacyConfig->ipAnonymizerEnabled = true;
}
/**
* Returns true if IP anonymization support is enabled, false if otherwise.
*
* @return bool
*/
public static function isActive()
{
$privacyConfig = new Config();
return $privacyConfig->ipAnonymizerEnabled;
}
}
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