Fix current user issue and add tracking features (#1)

* Add cross subdomain tracking

* Add cross subdomain tracking

* Enable crossdomain linking

* Move crossdomain code to a better place

* Remove subdomain from site title

* Fix all subdomains parameter

* Be more specific in subdomain tracking description

* Add user ID tracking

* Handle whitespace around user id field

* Exclude some groups from tracking

* Add exmaple groups to exclude from tracking

* Fix whitespace handling in user ID tracking

* Fix null reference on anonymous users

common/head_tag.html

@@ -1,5 +1,15 @@
 <script type="text/discourse-plugin" version="0.2">
   api.onPageChange((url, title) => {
+    const currentUser = api.getCurrentUser();
+
+    if (settings.exclude_groups.trim() && currentUser) {
+      const excludedGroups = settings.exclude_groups.split(",").map(g => g.trim());
+      const currentUserGroups = currentUser.groups.map(g => g.name);
+      if (excludedGroups.filter(g => currentUserGroups.includes(g)).length) {
+        return;
+      }
+    }
+
     window._paq = window._paq || [];
     window._paq_loaded = window._paq_loaded || false;
 
@@ -12,8 +22,17 @@
       _paq_loaded = true;
     }
 
-    const currentUser = api._currentUser;
+    const userIdField = settings.user_id_tracking.trim();
-    _paq.push(['setCustomVariable', 1, 'Anonymous', !currentUser, 'visit']);
+    if (userIdField && currentUser && currentUser[userIdField]) {
+      _paq.push(['setUserId', currentUser[userIdField]]);
+    }
+
+    if (settings.subdomain_tracking) {
+      const allDomains = "*" + document.domain.substring(document.domain.indexOf("."));
+      _paq.push(["setCookieDomain", allDomains]);
+      _paq.push(["setDomains", allDomains]);
+    }
+
     _paq.push(["setCustomUrl", url]);
     _paq.push(["setDocumentTitle", title]);
     _paq.push(["trackPageView"]);

settings.yml

@@ -5,3 +5,15 @@ host_url:
 website_id:
   type: string
   default: ''
+exclude_groups:
+  type: string
+  default: ''
+  description: Comma separated list of groups to exclude from tracking such as admins, staff.
+user_id_tracking:
+  type: string
+  default: ''
+  description: An indentifying field name on the current user object such as id, username or external_id.
+subdomain_tracking:
+  type: bool
+  default: false
+  description: Track visitors across main domain & subdomains, assuming discourse is on a subdomain.