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msd2/tracking/piwik/core/Tracker/Settings.php

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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;
+
+use Piwik\Config;
+use Piwik\Tracker;
+use Piwik\DeviceDetectorFactory;
+use Piwik\SettingsPiwik;
+
+class Settings // TODO: merge w/ visitor recognizer or make it it's own service. the class name is required for BC.
+{
+    const OS_BOT = 'BOT';
+
+    /**
+     * If `true`, the config ID for a visitor will be the same no matter what site is being tracked.
+     * If `false, the config ID will be different.
+     *
+     * @var bool
+     */
+    private $isSameFingerprintsAcrossWebsites;
+
+    public function __construct($isSameFingerprintsAcrossWebsites)
+    {
+        $this->isSameFingerprintsAcrossWebsites = $isSameFingerprintsAcrossWebsites;
+    }
+
+    public function getConfigId(Request $request, $ipAddress)
+    {
+        list($plugin_Flash, $plugin_Java, $plugin_Director, $plugin_Quicktime, $plugin_RealPlayer, $plugin_PDF,
+            $plugin_WindowsMedia, $plugin_Gears, $plugin_Silverlight, $plugin_Cookie) = $request->getPlugins();
+
+        $userAgent = $request->getUserAgent();
+
+        $deviceDetector = DeviceDetectorFactory::getInstance($userAgent);
+        $aBrowserInfo   = $deviceDetector->getClient();
+
+        if ($aBrowserInfo['type'] != 'browser') {
+            // for now only track browsers
+            unset($aBrowserInfo);
+        }
+
+        $browserName    = !empty($aBrowserInfo['short_name']) ? $aBrowserInfo['short_name'] : 'UNK';
+        $browserVersion = !empty($aBrowserInfo['version']) ? $aBrowserInfo['version'] : '';
+
+        if ($deviceDetector->isBot()) {
+            $os = self::OS_BOT;
+        } else {
+            $os = $deviceDetector->getOS();
+            $os = empty($os['short_name']) ? 'UNK' : $os['short_name'];
+        }
+
+        $browserLang = substr($request->getBrowserLanguage(), 0, 20); // limit the length of this string to match db
+
+        return $this->getConfigHash(
+            $request,
+            $os,
+            $browserName,
+            $browserVersion,
+            $plugin_Flash,
+            $plugin_Java,
+            $plugin_Director,
+            $plugin_Quicktime,
+            $plugin_RealPlayer,
+            $plugin_PDF,
+            $plugin_WindowsMedia,
+            $plugin_Gears,
+            $plugin_Silverlight,
+            $plugin_Cookie,
+            $ipAddress,
+            $browserLang);
+    }
+
+    /**
+     * Returns a 64-bit hash that attemps to identify a user.
+     * Maintaining some privacy by default, eg. prevents the merging of several Piwik serve together for matching across instances..
+     *
+     * @param $os
+     * @param $browserName
+     * @param $browserVersion
+     * @param $plugin_Flash
+     * @param $plugin_Java
+     * @param $plugin_Director
+     * @param $plugin_Quicktime
+     * @param $plugin_RealPlayer
+     * @param $plugin_PDF
+     * @param $plugin_WindowsMedia
+     * @param $plugin_Gears
+     * @param $plugin_Silverlight
+     * @param $plugin_Cookie
+     * @param $ip
+     * @param $browserLang
+     * @return string
+     */
+    protected function getConfigHash(Request $request, $os, $browserName, $browserVersion, $plugin_Flash, $plugin_Java,
+                                     $plugin_Director, $plugin_Quicktime, $plugin_RealPlayer, $plugin_PDF,
+                                     $plugin_WindowsMedia, $plugin_Gears, $plugin_Silverlight, $plugin_Cookie, $ip,
+                                     $browserLang)
+    {
+        // prevent the config hash from being the same, across different Piwik instances
+        // (limits ability of different Piwik instances to cross-match users)
+        $salt = SettingsPiwik::getSalt();
+
+        $configString =
+              $os
+            . $browserName . $browserVersion
+            . $plugin_Flash . $plugin_Java . $plugin_Director . $plugin_Quicktime . $plugin_RealPlayer . $plugin_PDF
+            . $plugin_WindowsMedia . $plugin_Gears . $plugin_Silverlight . $plugin_Cookie
+            . $ip
+            . $browserLang
+            . $salt;
+
+        if (!$this->isSameFingerprintsAcrossWebsites) {
+            $configString .= $request->getIdSite();
+        }
+
+        $hash = md5($configString, $raw_output = true);
+
+        return substr($hash, 0, Tracker::LENGTH_BINARY_ID);
+    }
+}