forked from rebillar/site-accueil-insa
82 lines
2.8 KiB
PHP
82 lines
2.8 KiB
PHP
<?php
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/**
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* Matomo - free/libre analytics platform
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*
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* @link https://matomo.org
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* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
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*
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*/
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namespace Piwik\Tracker;
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use Piwik\Common;
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use Piwik\Date;
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use Piwik\Option;
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class FingerprintSalt
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{
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const OPTION_PREFIX = 'fingerprint_salt_';
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const DELETE_FINGERPRINT_OLDER_THAN_SECONDS = 432000; // 5 days in seconds
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public function generateSalt()
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{
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return Common::getRandomString(32);
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}
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public function deleteOldSalts()
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{
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// we want to make sure to delete salts that were created more than three days ago as they are likely not in
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// use anymore. We should delete them to ensure the fingerprint is truly random for each day because if we used
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// eg the regular salt then it would technically still be possible to try and regenerate the fingerprint based
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// on certain information.
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// Typically, only the salts for today and yesterday are used. However, if someone was to import historical data
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// for the same day and this takes more than five days, then it could technically happen that we delete a
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// fingerprint that is still in use now and as such after deletion a few visitors would have a new configId
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// within one visit and such a new visit would be created. That should be very much edge case though.
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$deleteSaltsCreatedBefore = Date::getNowTimestamp() - self::DELETE_FINGERPRINT_OLDER_THAN_SECONDS;
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$options = Option::getLike(self::OPTION_PREFIX . '%');
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$deleted = array();
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foreach ($options as $name => $value) {
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$value = $this->decode($value);
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if (empty($value['time']) || $value['time'] < $deleteSaltsCreatedBefore) {
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Option::delete($name);
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$deleted[] = $name;
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}
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}
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return $deleted;
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}
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public function getDateString(Date $date, $timezone)
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{
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$dateString = Date::factory($date->getTimestampUTC(), $timezone)->toString();
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return $dateString;
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}
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private function encode($value)
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{
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return json_encode($value);
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}
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private function decode($value)
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{
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return @json_decode($value, true);
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}
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public function getSalt($dateString, $idSite)
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{
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$fingerprintSaltKey = self::OPTION_PREFIX . (int) $idSite . '_' . $dateString;
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$salt = Option::get($fingerprintSaltKey);
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if (!empty($salt)) {
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$salt = $this->decode($salt);
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}
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if (empty($salt['value'])) {
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$salt = array(
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'value' => $this->generateSalt(),
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'time' => Date::getNowTimestamp()
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);
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Option::set($fingerprintSaltKey, $this->encode($salt));
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}
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return $salt['value'];
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}
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}
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