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msd2/tracking/piwik/core/Tracker/Response.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 Exception;
+use Piwik\Common;
+use Piwik\Profiler;
+use Piwik\Timer;
+use Piwik\Tracker;
+use Piwik\Tracker\Db as TrackerDb;
+
+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()) {
+            $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()) {
+            Common::sendHeader('Content-Type: text/html; charset=utf-8');
+            $trailer = '<span style="color: #888888">Backtrace:<br /><pre>' . $e->getTraceAsString() . '</pre></span>';
+            $headerPage = file_get_contents(PIWIK_INCLUDE_PATH . '/plugins/Morpheus/templates/simpleLayoutHeader.tpl');
+            $footerPage = file_get_contents(PIWIK_INCLUDE_PATH . '/plugins/Morpheus/templates/simpleLayoutFooter.tpl');
+            $headerPage = str_replace('{$HTML_TITLE}', 'Matomo &rsaquo; Error', $headerPage);
+
+            echo $headerPage . '<p>' . $this->getMessageFromException($e) . '</p>' . $trailer . $footerPage;
+        } 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>.";
+        } 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;
+        }
+
+        $this->outputTransparentGif();
+    }
+
+    private function outputTransparentGif()
+    {
+        $transGifBase64 = "R0lGODlhAQABAIAAAAAAAAAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==";
+        Common::sendHeader('Content-Type: image/gif');
+
+        echo base64_decode($transGifBase64);
+    }
+
+    /**
+     * 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)
+    {
+        error_log(sprintf("Error in Matomo (tracker): %s", str_replace("\n", " ", $this->getMessageFromException($e))));
+    }
+}