initial version

CHANGELOG.md

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+## Changelog
+
+### 0.1.0
+
+initial version

IgnoreDNTEnabledByDefault.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\IgnoreDNTEnabledByDefault;
+
+use Piwik\Tracker\Request;
+
+class IgnoreDNTEnabledByDefault extends \Piwik\Plugin
+{
+    public function registerEvents() {
+        return array(
+            'PrivacyManager.shouldIgnoreDnt' => 'handleDNTHeader'
+        );
+    }
+
+    public function isTrackerPlugin() {
+        return true;
+    }
+
+    public function handleDNTHeader(&$shouldIgnore) {
+        $shouldIgnore = $this->isUserAgentWithDoNotTrackAlwaysEnabled();
+    }
+
+    /**
+     * @return bool
+     */
+    public function isUserAgentWithDoNotTrackAlwaysEnabled() {
+        $request = new Request($_REQUEST);
+        $userAgent = $request->getUserAgent();
+        $browsersWithDnt = $this->getBrowsersWithDNTAlwaysEnabled();
+        foreach ($browsersWithDnt as $userAgentBrowserFragment) {
+            if (stripos($userAgent, $userAgentBrowserFragment) !== false) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Some browsers have DNT enabled by default. For those we will ignore DNT and always track those users.
+     *
+     * @return array
+     */
+    protected function getBrowsersWithDNTAlwaysEnabled() {
+        return array(
+            // IE
+            'MSIE',
+            'Trident',
+            // Maxthon
+            'Maxthon',
+
+            // Epiphany - https://github.com/matomo-org/matomo/issues/8682
+            'Epiphany',
+        );
+    }
+}

README.md

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+# Matomo IgnoreDNTByDefault Plugin
+
+## Description
+
+Before 3.9.0 Matomo ignored the DoNotTrack setting in Internet Explorer, Maxthon and Epiphany as these browsers have enabled it by default without any interaction by users.
+
+If a significant fraction of your website vistors use these browsers and are missing in your reports because of this change, you can install this plugin to restore the old behaviour.

plugin.json

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+{
+  "name": "IgnoreDNTEnabledByDefault",
+  "description": "restore the behaviour of Matomo <=3.8.0",
+  "version": "0.1.0",
+  "theme": false,
+  "require": {
+    "piwik": ">=3.9.0,<4.0.0-b1"
+  },
+  "authors": [
+    {
+      "name": "Lukas Winkler",
+      "email": "lukas@matomo.org",
+      "homepage": "https://lw1.at"
+    }
+  ],
+  "support": {
+    "email": "lukas@matomo.org",
+    "issues": "https://github.com/Findus23/plugin-IgnoreDNTEnabledByDefault/issues",
+    "forum": "https://forum.matomo.org",
+    "source": "https://github.com/Findus23/plugin-IgnoreDNTEnabledByDefault"
+  },
+  "homepage": "https://matomo.org",
+  "license": "GPL v3+",
+  "keywords": [
+    "privacy",
+    "donottrack"
+  ]
+}