Use pii code in cross linker

- avoids duplication, already had email stripping code
- also now includes dates and postcodes

app/assets/javascripts/analytics_toolkit/google-analytics-universal-tracker.js

@@ -3,6 +3,9 @@
 
   var $ = global.jQuery
   var GOVUK = global.GOVUK || {}
+  var pii = new GOVUK.pii()
+  pii.stripDatePII = true
+  pii.stripPostcodePII = true
 
   var GoogleAnalyticsUniversalTracker = function (trackingId, fieldsObject) {
     function configureProfile () {
@@ -26,7 +29,8 @@
     }
 
     function stripLocationPII () {
-      sendToGa('set', 'location', stripEmailAddressesFromString(window.location.href))
+      console.log(pii.stripPII(window.location.href))
+      sendToGa('set', 'location', pii.stripPII(window.location.href))
     }
 
     // Support legacy cookieDomain param
@@ -183,11 +187,6 @@
     }
   }
 
-  function stripEmailAddressesFromString (string) {
-    var stripped = string.replace(/[^\s=/?&]+(?:@|%40)[^\s=/?&]+/g, '[email]')
-    return stripped
-  }
-
   GOVUK.GoogleAnalyticsUniversalTracker = GoogleAnalyticsUniversalTracker
 
   global.GOVUK = GOVUK

spec/javascripts/analytics_toolkit/google-analytics-universal-tracker.spec.js

@@ -190,9 +190,12 @@ describe('GOVUK.GoogleAnalyticsUniversalTracker', function () {
   })
 
   describe('when tracking all events', function () {
-    window.history.replaceState(null, null, '[email protected]')
-    it('removes any email address from the location', function () {
+    window.history.replaceState(null, null, '[email protected]&postcode=sw11wa&date=2019-01-01')
+
+    it('removes any pii from the location', function () {
       expect(window.ga.calls.mostRecent().args[2]).toContain('address=[email]')
+      expect(window.ga.calls.mostRecent().args[2]).toContain('postcode=[postcode]')
+      expect(window.ga.calls.mostRecent().args[2]).toContain('date=[date]')
     })
   })