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<?php
/**
* Matomo - free/libre analytics platform
*
* @link https://matomo.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\Tracker;
use Exception;
use Piwik\Common;
use Piwik\Config;
use Piwik\Profiler;
use Piwik\Timer;
use Piwik\Tracker;
use Piwik\Tracker\Db as TrackerDb;
use Piwik\Url;
class Response
{
private $timer;
private $content;
public function init(Tracker $tracker)
{
ob_start();
// we use ob_start only because of Common::printDebug, we should actually not really use ob_start
if ($tracker->isDebugModeEnabled() && \Piwik\Tracker\TrackerConfig::getConfigValue('enable_sql_profiler')) {
$this->timer = new Timer();
TrackerDb::enableProfiling();
}
}
public function getOutput()
{
$this->outputAccessControlHeaders();
if (is_null($this->content) && ob_get_level() > 0) {
$this->content = ob_get_clean();
}
return $this->content;
}
/**
* Echos an error message & other information, then exits.
*
* @param Tracker $tracker
* @param Exception $e
* @param int $statusCode eg 500
*/
public function outputException(Tracker $tracker, Exception $e, $statusCode)
{
Common::sendResponseCode($statusCode);
$this->logExceptionToErrorLog($e);
if ($tracker->isDebugModeEnabled()) {
echo "\nAn exception occurred: " . $this->getMessageFromException($e) . "\n\n";
} else {
$this->outputApiResponse($tracker);
}
}
public function outputResponse(Tracker $tracker)
{
if (!$tracker->shouldRecordStatistics()) {
Common::sendResponseCode(503);
$this->outputApiResponse($tracker);
Common::printDebug("Logging disabled, display transparent logo");
} elseif (!$tracker->hasLoggedRequests()) {
if (!$this->isHttpGetRequest() || !empty($_GET) || !empty($_POST)) {
Common::sendResponseCode(400);
}
Common::printDebug("Empty request => Matomo page");
echo "This resource is part of Matomo. Keep full control of your data with the leading free and open source <a href='https://matomo.org' target='_blank' rel='noopener noreferrer nofollow'>web analytics & conversion optimisation platform</a>.<br>\n";
echo "This file is the endpoint for the Matomo tracking API. If you want to access the Matomo UI or use the Reporting API, please use <a href='index.php'>index.php</a> instead.\n";
} else {
$this->outputApiResponse($tracker);
Common::printDebug("Nothing to notice => default behaviour");
}
Common::printDebug("End of the page.");
if ($tracker->isDebugModeEnabled() && $tracker->isDatabaseConnected() && TrackerDb::isProfilingEnabled()) {
$db = Tracker::getDatabase();
$db->recordProfiling();
Profiler::displayDbTrackerProfile($db);
}
if ($tracker->isDebugModeEnabled()) {
Common::printDebug($_COOKIE);
Common::printDebug((string) $this->timer);
}
}
private function outputAccessControlHeaders()
{
if (!$this->isHttpGetRequest()) {
$origin = isset($_SERVER['HTTP_ORIGIN']) ? $_SERVER['HTTP_ORIGIN'] : '*';
Common::sendHeader('Access-Control-Allow-Origin: ' . $origin);
Common::sendHeader('Access-Control-Allow-Credentials: true');
}
}
private function isHttpGetRequest()
{
$requestMethod = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
return strtoupper($requestMethod) === 'GET';
}
private function getOutputBuffer()
{
return ob_get_contents();
}
protected function hasAlreadyPrintedOutput()
{
return strlen($this->getOutputBuffer()) > 0;
}
private function outputApiResponse(Tracker $tracker)
{
if ($tracker->isDebugModeEnabled()) {
return;
}
if ($this->hasAlreadyPrintedOutput()) {
return;
}
$request = $_GET + $_POST;
if ($this->isHttpGetRequest()) {
Common::sendHeader('Cache-Control: no-store');
}
if (array_key_exists('send_image', $request) && $request['send_image'] === '0') {
Common::sendResponseCode(204);
return;
}
// Check for a custom tracking image
$customImage = Config::getInstance()->Tracker['custom_image'];
if (!empty($customImage) && $this->outputCustomImage($customImage)) {
return;
}
// No custom image defined, so output the default 1x1 base64 transparent gif
$this->outputTransparentGif();
}
/**
* Output a 1px x 1px transparent gif
*/
private function outputTransparentGif()
{
$transGifBase64 = "R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==";
Common::sendHeader('Content-Type: image/gif');
echo base64_decode($transGifBase64);
}
/**
* Output a custom tracking image
*
* @param string $customImage The custom image setting specified in the config
*
* @return bool True if the custom image was successfully output, else false
*/
private function outputCustomImage(string $customImage) : bool
{
$supportedMimeTypes = ['image/png', 'image/gif', 'image/jpeg'];
$img = null;
$size = null;
if (strlen($customImage) > 2 && substr($customImage, -2) == '==') {
// Base64 image string
$img = base64_decode($customImage);
$size = getimagesizefromstring($img);
} elseif (is_file($customImage) && is_readable($customImage)) {
// Image file
$img = file_get_contents($customImage);
$size = getimagesize($customImage);
// imagesize is used to get the mime type
}
// Must have valid image data and a valid mime type to proceed
if ($img && $size && isset($size['mime']) && in_array($size['mime'], $supportedMimeTypes)) {
Common::sendHeader('Content-Type: ' . $size['mime']);
echo $img;
return true;
}
return false;
}
/**
* Gets the error message to output when a tracking request fails.
*
* @param Exception $e
* @return string
*/
protected function getMessageFromException($e)
{
// Note: duplicated from FormDatabaseSetup.isAccessDenied
// Avoid leaking the username/db name when access denied
if ($e->getCode() == 1044 || $e->getCode() == 42000) {
return "Error while connecting to the Matomo database - please check your credentials in config/config.ini.php file";
}
if (Common::isPhpCliMode()) {
return $e->getMessage() . "\n" . $e->getTraceAsString();
}
return $e->getMessage();
}
protected function logExceptionToErrorLog($e)
{
$hostname = Url::getRFCValidHostname();
$hostStr = $hostname ? "[{$hostname}]" : '-';
error_log(sprintf("{$hostStr} Error in Matomo (tracker): %s", str_replace("\n", " ", $this->getMessageFromException($e))));
}
}