update Piwik to version 2.16 (fixes #91)

www/analytics/js/tracker.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+use Piwik\ProxyHttp;
+
+/**
+ * Tracker proxy
+ */
+if ($_SERVER['REQUEST_METHOD'] == 'POST'
+    || !empty($_SERVER['QUERY_STRING'])
+) {
+    include '../piwik.php';
+    exit;
+}
+
+/**
+ * piwik.js proxy
+ *
+ * @see core/Piwik.php
+ */
+define('PIWIK_INCLUDE_PATH', '..');
+define('PIWIK_DOCUMENT_ROOT', '..');
+define('PIWIK_USER_PATH', '..');
+
+require_once PIWIK_INCLUDE_PATH . '/libs/upgradephp/upgrade.php';
+
+if (is_dir(PIWIK_INCLUDE_PATH . '/vendor')) {
+    define('PIWIK_VENDOR_PATH', PIWIK_INCLUDE_PATH . '/vendor'); // Piwik is the main project
+} else {
+    define('PIWIK_VENDOR_PATH', PIWIK_INCLUDE_PATH . '/../..'); // Piwik is installed as a Composer dependency
+}
+
+// Composer autoloader
+require PIWIK_VENDOR_PATH . '/autoload.php';
+
+$file = '../piwik.js';
+
+$daysExpireFarFuture = 10;
+
+$byteStart = $byteEnd = false;
+if (!defined("PIWIK_KEEP_JS_TRACKER_COMMENT")
+    || !PIWIK_KEEP_JS_TRACKER_COMMENT
+) {
+    $byteStart = 369; // length of comment header in bytes
+}
+
+$environment = new \Piwik\Application\Environment(null);
+$environment->init();
+
+ProxyHttp::serverStaticFile($file, "application/javascript; charset=UTF-8", $daysExpireFarFuture, $byteStart, $byteEnd);
+
+exit;