added proxy feature for Matomo Tag Manager

config.php.example

@@ -10,6 +10,14 @@
 // This URL will never be revealed to visitors or search engines.
 $MATOMO_URL = 'http://your-matomo-domain.example.org/matomo/';
 
+$MATOMO_TRUSTED_URLS = [
+    // Edit the lines below, and replace http://your-matomo-domain.example.org/matomo/
+    // with your Matomo URL ending with a slash.
+    // Also add any other trusted_hosts[] - config you have in config/config.ini.php
+    // These URLs will never be revealed to visitors or search engines using the tag manager.
+    'http://your-matomo-domain.example.org/matomo/'
+];
+
 // Edit the line below and replace http://your-tracker-proxy.org/ with the URL to your tracker-proxy
 // setup. This URL will be used in Matomo output that contains the Matomo URL, so your Matomo is effectively
 // hidden.

js/.htaccess

@@ -0,0 +1,3 @@
+RewriteEngine On
+
+RewriteRule ^(.*)\.js$ index.php

js/index.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * Matomo - free/libre analytics platform
+ * Matomo Proxy Hide URL
+ *
+ * @link https://matomo.org/faq/how-to/#faq_132
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+$configFile = __DIR__ . '/../config.php';
+if (file_exists($configFile)) {
+    include $configFile;
+}
+
+$calledJsFile = $_SERVER['REQUEST_URI'];
+
+if (strpos($calledJsFile, 'js') === false) {
+    exit();
+}
+
+// -----
+// Important: read the instructions in README.md or at:
+// https://github.com/matomo-org/tracker-proxy#matomo-tracker-proxy
+// -----
+//// FALLBACK CONFIG IF config.php IS NOT USED
+
+// Edit the line below, and replace http://your-matomo-domain.example.org/matomo/
+// with your Matomo URL ending with a slash.
+// This URL will never be revealed to visitors or search engines.
+if (! isset($MATOMO_URL)) {
+    $MATOMO_URL = 'http://your-matomo-domain.example.org/matomo/';
+}
+
+if (! isset($MATOMO_URL)) {
+    $MATOMO_TRUSTED_URLS = [
+        // Edit the lines below, and replace http://your-matomo-domain.example.org/matomo/
+        // with your Matomo URL ending with a slash.
+        // Also add any other trusted_hosts[] - config you have in config/config.ini.php
+        // These URLs will never be revealed to visitors or search engines using the tag manager.
+        'http://your-matomo-domain.example.org/matomo/'
+    ];
+}
+
+// Edit the line below and replace http://your-tracker-proxy.org/ with the URL to your tracker-proxy
+// setup. This URL will be used in Matomo output that contains the Matomo URL, so your Matomo is effectively
+// hidden.
+if (! isset($PROXY_URL)) {
+    $PROXY_URL = 'http://your-tracker-proxy.org/';
+}
+
+$fileName = $MATOMO_URL . $calledJsFile;
+$fileContent = file_get_contents($fileName);
+
+echo str_replace($MATOMO_TRUSTED_URLS, $PROXY_URL, $fileContent);