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msd2/tracking/piwik/plugins/CustomPiwikJs/TrackingCode/PiwikJsManipulator.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\Plugins\CustomPiwikJs\TrackingCode;
+
+use Piwik\Piwik;
+
+class PiwikJsManipulator
+{
+    const HOOK = '/*!!! pluginTrackerHook */';
+    /**
+     * @var string
+     */
+    private $content;
+
+    /** @var PluginTrackerFiles */
+    private $pluginTrackerFiles;
+
+    public function __construct($content, PluginTrackerFiles $pluginTrackerFiles)
+    {
+        $this->content = $content;
+        $this->pluginTrackerFiles = $pluginTrackerFiles;
+    }
+
+    public function manipulateContent()
+    {
+        $files = $this->pluginTrackerFiles->find();
+
+        foreach ($files as $file) {
+            $trackerExtension = $this->getSignatureWithContent($file->getName(), $file->getContent());
+
+            // for some reasons it is /*!!! in piwik.js minified and /*!! in js/piwik.js unminified
+            $this->content = str_replace(array(self::HOOK, '/*!! pluginTrackerHook */'), self::HOOK . $trackerExtension, $this->content);
+        }
+
+        $content = $this->content;
+
+        /**
+         * Triggered after the Matomo JavaScript tracker has been generated and shortly before the tracker file
+         * is written to disk. You can listen to this event to for example automatically append some code to the JS
+         * tracker file.
+         *
+         * **Example**
+         *
+         *     function onManipulateJsTracker (&$content) {
+         *         $content .= "\nPiwik.DOM.onLoad(function () { console.log('loaded'); });";
+         *     }
+         *
+         * @param string $content the generated JavaScript tracker code
+         */
+        Piwik::postEvent('CustomMatomoJs.manipulateJsTracker', array(&$content));
+        $this->content = $content;
+
+        return $this->content;
+    }
+
+    /**
+     * @param string $name
+     * @param string $content
+     * @return string
+     */
+    private function getSignatureWithContent($name, $content)
+    {
+        return sprintf(
+            "\n\n/* GENERATED: %s */\n%s\n/* END GENERATED: %s */\n",
+            $name,
+            $content,
+            $name
+        );
+    }
+
+}