1 files changed, 79 insertions, 0 deletions
diff --git a/plugins/AnonymizeIP/AnonymizeIP.php b/plugins/AnonymizeIP/AnonymizeIP.php
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index 0000000000..e921b57e31
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+++ b/plugins/AnonymizeIP/AnonymizeIP.php
@@ -0,0 +1,79 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html Gpl v3 or later
+ * @version $Id$
+ *
+ * @category Piwik_Plugins
+ * @package Piwik_AnonymizeIP
+ */
+
+/**
+ * Anonymize visitor IP addresses to comply with the privacy laws/guidelines in countries, such as Germany.
+ *
+ * @package Piwik_AnonymizeIP
+ */
+class Piwik_AnonymizeIP extends Piwik_Plugin
+{
+	/**
+	 * Get plugin information
+	 */
+	public function getInformation()
+	{
+		return array(
+			'description' => Piwik_Translate('AnonymizeIP_PluginDescription'),
+			'author' => 'Piwik',
+			'author_homepage' => 'http://piwik.org/',
+			'version' => Piwik_Version::VERSION,
+			'TrackerPlugin' => true,
+		);
+	}
+
+	/**
+	 * Get list of hooks to register
+	 */
+	public function getListHooksRegistered()
+	{
+		return array(
+			'Tracker.saveVisitorInformation' => 'anonymizeVisitorIpAddress',
+		);
+	}
+
+	/**
+	 * Internal function to mask portions of the visitor IP address
+	 *
+	 * @param $ip Unsigned long representation of IP address
+	 * @param $maskLength Number of octets to reset
+	 */
+	static public function applyIPMask($ip, $maskLength)
+	{
+		$maskedIP = pack('V', (float)$ip);
+
+		switch($maskLength) {
+			case 4:
+				$maskedIP[3] = "\0";
+			case 3:
+				$maskedIP[2] = "\0";
+			case 2:
+				$maskedIP[1] = "\0";
+			case 1:
+				$maskedIP[0] = "\0";
+			case 0:
+			default:
+		}
+
+		$res = unpack('V', $maskedIP);
+		return sprintf("%u", $res[1]);
+	}
+
+	/**
+	 * Hook on Tracker.saveVisitorInformation to anonymize visitor IP addresses
+	 */
+	function anonymizeVisitorIpAddress($notification)
+	{
+		$visitorInfo =& $notification->getNotificationObject();
+		$visitorInfo['location_ip'] = self::applyIPMask($visitorInfo['location_ip'], Piwik_Tracker_Config::getInstance()->Tracker['ip_address_mask_length']);
+	}
+}