Add RespectDoNotTrack to GDPR privacy policy for Google Analytics

See #4616

3 files changed, 48 insertions, 20 deletions

diff --git a/tpl/tplimpl/embedded/templates.autogen.go b/tpl/tplimpl/embedded/templates.autogen.go
index 8556c32c7..71a1fd14f 100644
--- a/tpl/tplimpl/embedded/templates.autogen.go
+++ b/tpl/tplimpl/embedded/templates.autogen.go
@@ -103,23 +103,37 @@ var EmbeddedTemplates = [][2]string{
 {{- if not $pc.Disable -}}
 {{ with .Site.GoogleAnalytics }}
 <script>
-(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-
-ga('create', '{{ . }}', 'auto');
-ga('send', 'pageview');
+{{ template "__ga_js_set_doNotTrack" $ }}
+if (!doNotTrack) {
+	(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+	(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+	m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+	})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
+	ga('create', '{{ . }}', 'auto');
+	ga('send', 'pageview');
+}
 </script>
 {{ end }}
+{{- end -}}
+{{- define "__ga_js_set_doNotTrack" -}}{{/* This is also used in the async version. */}}
+{{- $pc := .Site.PrivacyConfig.GoogleAnalytics -}}
+{{- if not $pc.RespectDoNotTrack -}}
+var doNotTrack = false;
+{{- else -}}
+var dnt = (navigator.doNotTrack || window.doNotTrack || navigator.msDoNotTrack);
+var doNotTrack = (dnt == "1" || dnt == "yes");
+{{- end -}}
 {{- end -}}`},
 	{`google_analytics_async.html`, `{{- $pc := .Site.PrivacyConfig.GoogleAnalytics -}}
 {{- if not $pc.Disable -}}
 {{ with .Site.GoogleAnalytics }}
 <script>
-window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
-ga('create', '{{ . }}', 'auto');
-ga('send', 'pageview');
+{{ template "__ga_js_set_doNotTrack" $ }}
+if (!doNotTrack) {
+	window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
+	ga('create', '{{ . }}', 'auto');
+	ga('send', 'pageview');
+}
 </script>
 <script async src='//www.google-analytics.com/analytics.js'></script>
 {{ end }}
diff --git a/tpl/tplimpl/embedded/templates/google_analytics.html b/tpl/tplimpl/embedded/templates/google_analytics.html
index 89c193240..8c7951b58 100755
--- a/tpl/tplimpl/embedded/templates/google_analytics.html
+++ b/tpl/tplimpl/embedded/templates/google_analytics.html
@@ -2,13 +2,24 @@
 {{- if not $pc.Disable -}}
 {{ with .Site.GoogleAnalytics }}
 <script>
-(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-
-ga('create', '{{ . }}', 'auto');
-ga('send', 'pageview');
+{{ template "__ga_js_set_doNotTrack" $ }}
+if (!doNotTrack) {
+	(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+	(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+	m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
+	})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
+	ga('create', '{{ . }}', 'auto');
+	ga('send', 'pageview');
+}
 </script>
 {{ end }}
+{{- end -}}
+{{- define "__ga_js_set_doNotTrack" -}}{{/* This is also used in the async version. */}}
+{{- $pc := .Site.PrivacyConfig.GoogleAnalytics -}}
+{{- if not $pc.RespectDoNotTrack -}}
+var doNotTrack = false;
+{{- else -}}
+var dnt = (navigator.doNotTrack || window.doNotTrack || navigator.msDoNotTrack);
+var doNotTrack = (dnt == "1" || dnt == "yes");
+{{- end -}}
 {{- end -}}
\ No newline at end of file
diff --git a/tpl/tplimpl/embedded/templates/google_analytics_async.html b/tpl/tplimpl/embedded/templates/google_analytics_async.html
index eb4fe9b88..48a24c1c0 100755
--- a/tpl/tplimpl/embedded/templates/google_analytics_async.html
+++ b/tpl/tplimpl/embedded/templates/google_analytics_async.html
@@ -2,9 +2,12 @@
 {{- if not $pc.Disable -}}
 {{ with .Site.GoogleAnalytics }}
 <script>
-window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
-ga('create', '{{ . }}', 'auto');
-ga('send', 'pageview');
+{{ template "__ga_js_set_doNotTrack" $ }}
+if (!doNotTrack) {
+	window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
+	ga('create', '{{ . }}', 'auto');
+	ga('send', 'pageview');
+}
 </script>
 <script async src='//www.google-analytics.com/analytics.js'></script>
 {{ end }}