From be4ee7619465d67200a9f175a2a9486aa9825d07 Mon Sep 17 00:00:00 2001
From: Vincent Vanwaelscappel <vincent@cubedesigners.com>
Date: Tue, 26 Feb 2019 17:33:50 +0100
Subject: [PATCH] wip #2609 @0.25

---
 resources/config/config.php |  5 ++++
 src/GoogleAnalytics.php     | 21 +++++++++++++++++
 src/GtagFrontProvider.php   |  1 +
 src/ScriptViewCreator.php   | 47 ++++++++++++++++++++-----------------
 4 files changed, 52 insertions(+), 22 deletions(-)

diff --git a/resources/config/config.php b/resources/config/config.php
index 3b2bff4..a0c3110 100644
--- a/resources/config/config.php
+++ b/resources/config/config.php
@@ -11,4 +11,9 @@ return [
      * Enable or disable script rendering. Useful for local development.
      */
     'enabled' => env('GOOGLE_ANALYTICS_ID', '') != '',
+
+    /*
+     * Observe Do Not Track header. Disable google analytics tracking when enabled on the user agent
+     */
+    'observe_dnt' => true,
 ];
diff --git a/src/GoogleAnalytics.php b/src/GoogleAnalytics.php
index 4356b18..dd4c5dc 100644
--- a/src/GoogleAnalytics.php
+++ b/src/GoogleAnalytics.php
@@ -16,6 +16,11 @@ class GoogleAnalytics
      */
     protected $enabled;
 
+    /**
+     * @var bool
+     */
+    protected $observe_dnt;
+
     /**
      * @param string $id
      */
@@ -60,4 +65,20 @@ class GoogleAnalytics
     {
         $this->enabled = false;
     }
+
+    /**
+     * @return bool
+     */
+    public function isObserveDnt()
+    {
+        return $this->observe_dnt;
+    }
+
+    /**
+     * @param bool $observe_dnt
+     */
+    public function setObserveDnt($observe_dnt)
+    {
+        $this->observe_dnt = $observe_dnt;
+    }
 }
diff --git a/src/GtagFrontProvider.php b/src/GtagFrontProvider.php
index d8f4e13..294f095 100644
--- a/src/GtagFrontProvider.php
+++ b/src/GtagFrontProvider.php
@@ -42,6 +42,7 @@ class GtagServiceProvider extends ServiceProvider
         if (config('gtag.enabled') === false) {
             $googleAnalytics->disable();
         }
+        $googleAnalytics->setObserveDnt(config('gtag.observe_dnt'));
 
         $this->app->instance('Cubist\Gtag\GoogleAnalytics', $googleAnalytics);
         $this->app->alias('Cubist\Gtag\GoogleAnalytics', 'gtag');
diff --git a/src/ScriptViewCreator.php b/src/ScriptViewCreator.php
index b0a64c6..9a71ff4 100644
--- a/src/ScriptViewCreator.php
+++ b/src/ScriptViewCreator.php
@@ -6,30 +6,33 @@ use Illuminate\View\View;
 
 class ScriptViewCreator
 {
-	/**
-	 * @var GoogleAnalytics
-	 */
-	protected $googleAnalytics;
+    /**
+     * @var GoogleAnalytics
+     */
+    protected $googleAnalytics;
 
 
-	public function __construct(GoogleAnalytics $googleAnalytics)
-	{
-		$this->googleAnalytics = $googleAnalytics;
-	}
+    public function __construct(GoogleAnalytics $googleAnalytics)
+    {
+        $this->googleAnalytics = $googleAnalytics;
+    }
 
-	/**
-	 * Bind data to the view.
-	 *
-	 * @param View $view
-	 */
-	public function create(View $view)
-	{
-		if ($this->googleAnalytics->isEnabled() && empty($this->googleAnalytics->id())) {
-			return;
-		}
+    /**
+     * Bind data to the view.
+     *
+     * @param View $view
+     */
+    public function create(View $view)
+    {
+        if ($this->googleAnalytics->isObserveDnt() && isset($_SERVER['HTTP_DNT']) && $_SERVER['HTTP_DNT'] === 1) {
+            $this->googleAnalytics->disable();
+        }
+        if ($this->googleAnalytics->isEnabled() && empty($this->googleAnalytics->id())) {
+            return;
+        }
 
-		$view
-			->with('enabled', $this->googleAnalytics->isEnabled())
-			->with('id', $this->googleAnalytics->id());
-	}
+        $view
+            ->with('enabled', $this->googleAnalytics->isEnabled())
+            ->with('id', $this->googleAnalytics->id());
+    }
 }
-- 
2.39.5