177 lines
5.4 KiB
PHP
Executable File
177 lines
5.4 KiB
PHP
Executable File
<?php
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/**
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Copyright 2009 Google Inc. All Rights Reserved.
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**/
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// Tracker version.
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define("VERSION", "4.4sh");
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define("COOKIE_NAME", "__utmmobile");
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// The path the cookie will be available to, edit this to use a different
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// cookie path.
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define("COOKIE_PATH", "/");
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// Two years in seconds.
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define("COOKIE_USER_PERSISTENCE", 63072000);
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// 1x1 transparent GIF
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$GIF_DATA = array(
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chr(0x47), chr(0x49), chr(0x46), chr(0x38), chr(0x39), chr(0x61),
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chr(0x01), chr(0x00), chr(0x01), chr(0x00), chr(0x80), chr(0xff),
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chr(0x00), chr(0xff), chr(0xff), chr(0xff), chr(0x00), chr(0x00),
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chr(0x00), chr(0x2c), chr(0x00), chr(0x00), chr(0x00), chr(0x00),
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chr(0x01), chr(0x00), chr(0x01), chr(0x00), chr(0x00), chr(0x02),
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chr(0x02), chr(0x44), chr(0x01), chr(0x00), chr(0x3b)
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);
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// The last octect of the IP address is removed to anonymize the user.
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function getIP($remoteAddress) {
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if (empty($remoteAddress)) {
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return "";
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}
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// Capture the first three octects of the IP address and replace the forth
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// with 0, e.g. 124.455.3.123 becomes 124.455.3.0
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$regex = "/^([^.]+\.[^.]+\.[^.]+\.).*/";
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if (preg_match($regex, $remoteAddress, $matches)) {
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return $matches[1] . "0";
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} else {
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return "";
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}
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}
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// Generate a visitor id for this hit.
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// If there is a visitor id in the cookie, use that, otherwise
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// use the guid if we have one, otherwise use a random number.
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function getVisitorId($guid, $account, $userAgent, $cookie) {
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// If there is a value in the cookie, don't change it.
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if (!empty($cookie)) {
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return $cookie;
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}
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$message = "";
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if (!empty($guid)) {
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// Create the visitor id using the guid.
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$message = $guid . $account;
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} else {
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// otherwise this is a new user, create a new random id.
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$message = $userAgent . uniqid(getRandomNumber(), true);
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}
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$md5String = md5($message);
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return "0x" . substr($md5String, 0, 16);
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}
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// Get a random number string.
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function getRandomNumber() {
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return rand(0, 0x7fffffff);
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}
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// Writes the bytes of a 1x1 transparent gif into the response.
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function writeGifData() {
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global $GIF_DATA;
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header("Content-Type: image/gif");
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header("Cache-Control: " .
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"private, no-cache, no-cache=Set-Cookie, proxy-revalidate");
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header("Pragma: no-cache");
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header("Expires: Wed, 17 Sep 1975 21:32:10 GMT");
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echo join($GIF_DATA);
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}
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// Make a tracking request to Google Analytics from this server.
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// Copies the headers from the original request to the new one.
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// If request containg utmdebug parameter, exceptions encountered
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// communicating with Google Analytics are thown.
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function sendRequestToGoogleAnalytics($utmUrl) {
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$options = array(
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"http" => array(
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"method" => "GET",
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"user_agent" => $_SERVER["HTTP_USER_AGENT"],
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"header" => ("Accepts-Language: " . $_SERVER["HTTP_ACCEPT_LANGUAGE"]))
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);
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if (!empty($_GET["utmdebug"])) {
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$data = file_get_contents(
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$utmUrl, false, stream_context_create($options));
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} else {
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$data = @file_get_contents(
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$utmUrl, false, stream_context_create($options));
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}
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}
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// Track a page view, updates all the cookies and campaign tracker,
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// makes a server side request to Google Analytics and writes the transparent
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// gif byte data to the response.
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function trackPageView() {
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$timeStamp = time();
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$domainName = $_SERVER["SERVER_NAME"];
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if (empty($domainName)) {
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$domainName = "";
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}
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// Get the referrer from the utmr parameter, this is the referrer to the
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// page that contains the tracking pixel, not the referrer for tracking
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// pixel.
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$documentReferer = $_GET["utmr"];
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if (empty($documentReferer) && $documentReferer !== "0") {
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$documentReferer = "-";
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} else {
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$documentReferer = urldecode($documentReferer);
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}
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$documentPath = $_GET["utmp"];
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if (empty($documentPath)) {
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$documentPath = "";
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} else {
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$documentPath = urldecode($documentPath);
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}
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$account = $_GET["utmac"];
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$userAgent = $_SERVER["HTTP_USER_AGENT"];
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if (empty($userAgent)) {
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$userAgent = "";
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}
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// Try and get visitor cookie from the request.
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$cookie = $_COOKIE[COOKIE_NAME];
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$visitorId = getVisitorId(
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$_SERVER["HTTP_X_DCMGUID"], $account, $userAgent, $cookie);
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// Always try and add the cookie to the response.
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setrawcookie(
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COOKIE_NAME,
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$visitorId,
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$timeStamp + COOKIE_USER_PERSISTENCE,
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COOKIE_PATH);
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$utmGifLocation = "http://www.google-analytics.com/__utm.gif";
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// Construct the gif hit url.
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$utmUrl = $utmGifLocation . "?" .
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"utmwv=" . VERSION .
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"&utmn=" . getRandomNumber() .
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"&utmhn=" . urlencode($domainName) .
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"&utmr=" . urlencode($documentReferer) .
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"&utmp=" . urlencode($documentPath) .
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"&utmac=" . $account .
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"&utmcc=__utma%3D999.999.999.999.999.1%3B" .
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"&utmvid=" . $visitorId .
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"&utmip=" . getIP($_SERVER["REMOTE_ADDR"]);
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sendRequestToGoogleAnalytics($utmUrl);
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// If the debug parameter is on, add a header to the response that contains
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// the url that was used to contact Google Analytics.
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if (!empty($_GET["utmdebug"])) {
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header("X-GA-MOBILE-URL:" . $utmUrl);
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}
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// Finally write the gif data to the response.
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writeGifData();
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}
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?><?php
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trackPageView();
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?>
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