/**
* Generates a unique user ID from the current user-specific properties.
*
* @link http://code.google.com/p/gaforflash/source/browse/trunk/src/com/google/analytics/v4/Tracker.as#563
* @return int
*/
protected function generateUniqueId()
{
// There seems to be an error in the gaforflash code, so we take the formula
// from http://xahlee.org/js/google_analytics_tracker_2010-07-01_expanded.js line 711
// instead ("&" instead of "*")
return (Util::generate32bitRandom() ^ $this->generateHash()) & 0x7fffffff;
}
public function validate()
{
// According to the GA documentation, there is a limit to the combined size of
// name and value of 64 bytes after URL encoding,
// see http://code.google.com/apis/analytics/docs/tracking/gaTrackingCustomVariables.html#varTypes
// and http://xahlee.org/js/google_analytics_tracker_2010-07-01_expanded.js line 563
if (strlen(Util::encodeUriComponent($this->name . $this->value)) > 64) {
Tracker::_raiseError('Custom Variable combined name and value encoded length must not be larger than 64 bytes.', __METHOD__);
}
}
/**
* @link http://code.google.com/p/gaforflash/source/browse/trunk/src/com/google/analytics/core/DocumentInfo.as#52
* @return int
*/
protected function generateSessionId()
{
// TODO: Integrate AdSense support
return Util::generate32bitRandom();
}
/**
* @link http://code.google.com/p/gaforflash/source/browse/trunk/src/com/google/analytics/v4/Tracker.as#585
* @return string
*/
protected function generateDomainHash()
{
$hash = 1;
if ($this->tracker->getAllowHash()) {
$hash = Util::generateHash($this->tracker->getDomainName());
}
return $hash;
}
/**
* @return string
*/
protected function buildHttpRequest()
{
$parameters = $this->buildParameters();
// This constant is supported as the 4th argument of http_build_query()
// from PHP 5.3.6 on and will tell it to use rawurlencode() instead of urlencode()
// internally, see http://code.google.com/p/php-ga/issues/detail?id=3
if (defined('PHP_QUERY_RFC3986')) {
// http_build_query() does automatically skip all array entries
// with null values, exactly what we want here
$queryString = http_build_query($parameters->toArray(), '', '&', PHP_QUERY_RFC3986);
} else {
// Manually replace "+"s with "%20" for backwards-compatibility
$queryString = str_replace('+', '%20', http_build_query($parameters->toArray(), '', '&'));
}
// Mimic Javascript's encodeURIComponent() encoding for the query
// string just to be sure we are 100% consistent with GA's Javascript client
$queryString = Util::convertToUriComponentEncoding($queryString);
// Recent versions of ga.js use HTTP POST requests if the query string is too long
$usePost = strlen($queryString) > 2036;
if (!$usePost) {
$r = 'GET ' . $this->config->getEndpointPath() . '?' . $queryString . ' HTTP/1.0' . "\r\n";
} else {
// FIXME: The "/p" shouldn't be hardcoded here, instead we need a GET and a POST endpoint...
$r = 'POST /p' . $this->config->getEndpointPath() . ' HTTP/1.0' . "\r\n";
}
$r .= 'Host: ' . $this->config->getEndpointHost() . "\r\n";
if ($this->userAgent) {
$r .= 'User-Agent: ' . str_replace(array("\n", "\r"), '', $this->userAgent) . "\r\n";
}
if ($this->xForwardedFor) {
// Sadly "X-Fowarded-For" is not supported by GA so far,
// see e.g. http://www.google.com/support/forum/p/Google+Analytics/thread?tid=017691c9e71d4b24,
// but we include it nonetheless for the pure sake of correctness (and hope)
$r .= 'X-Forwarded-For: ' . str_replace(array("\n", "\r"), '', $this->xForwardedFor) . "\r\n";
}
if ($usePost) {
// Don't ask me why "text/plain", but ga.js says so :)
$r .= 'Content-Type: text/plain' . "\r\n";
$r .= 'Content-Length: ' . strlen($queryString) . "\r\n";
}
$r .= 'Connection: close' . "\r\n";
$r .= "\r\n\r\n";
if ($usePost) {
$r .= $queryString;
}
return $r;
}
