Add Privacy Pack

- To enable, set `privacy_pack = true` in `config.toml`
- Show a cookie consent message to visitors
- Anonymize IP in Google Analytics (if enabled)

See #507

exampleSite/config.toml

@@ -151,6 +151,11 @@ defaultContentLanguageInSubdir = false
   # Enable native social sharing buttons?
   sharing = true
 
+  # Privacy pack
+  #   Show a cookie consent message to visitors
+  #   Anonymize IP in Google Analytics (if enabled)
+  privacy_pack = false
+
   # Link custom CSS and JS assets
   #   (relative to /static/css and /static/js respectively)
   custom_css = []

i18n/en.yaml

@@ -147,3 +147,14 @@
 
 - id: 404_recommendations
   translation: Perhaps you were looking for one of these?
+
+# Cookie consent
+
+- id: cookie_message
+  translation: This website uses cookies to ensure you get the best experience on our website.
+
+- id: cookie_dismiss
+  translation: Got it!
+
+- id: cookie_learn
+  translation: Learn more

layouts/partials/cookie_consent.html

@@ -0,0 +1,22 @@
+{{ if .Site.Params.privacy_pack }}
+<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.0.3/cookieconsent.min.css">
+<script src="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.0.3/cookieconsent.min.js"></script>
+<script>
+  window.addEventListener("load", function(){
+    window.cookieconsent.initialise({
+      "palette": {
+        "popup": {
+          "background": "#000"
+        },
+        "button": {
+          "background": "#f1d600"
+        }
+      },
+      "content": {
+        "message": {{ i18n "cookie_message" | default "This website uses cookies to ensure you get the best experience on our website." }},
+        "dismiss": {{ i18n "cookie_dismiss" | default "Got it!" }},
+        "link": {{ i18n "cookie_learn" | default "Learn more" }}
+      }
+    })});
+</script>
+{{ end }}

layouts/partials/header.html

@@ -81,6 +81,7 @@
     <script>
       window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
       ga('create', '{{ .Site.GoogleAnalytics }}', 'auto');
+      {{ if .Site.Params.privacy_pack }}ga('set', 'anonymizeIp', true);{{ end }}
       ga('require', 'eventTracker');
       ga('require', 'outboundLinkTracker');
       ga('require', 'urlChangeTracker');
@@ -124,6 +125,7 @@
   {{ if not .Date.IsZero }}<meta property="og:updated_time" content="{{ .Date.Format "2006-01-02T15:04:05-07:00" | safeHTML }}">{{ end }}
   {{ end }}
 
+  {{ partial "cookie_consent" . }}
   {{ partial "head_custom" . }}
 
   <title>{{ if not .IsHome }}{{ .Title }} | {{ end }}{{ .Site.Title }}</title>