Added new alpha analytics script for capturing events

refs https://github.com/TryGhost/Team/issues/1063
refs https://github.com/TryGhost/Team/issues/1062

Member activity is a labs alpha feature which aims at capturing member events for site owner if switched on. The event metadata captures the site page/post where the event originates from, and the post/page id is included as content of new ghost analytics meta tag.

This change sets up new analytics script in portal if analytics is switched on, and fires post/page view event when a valid analytics id is found.

ghost/portal/src/analytics.js

@@ -0,0 +1,22 @@
+import setupGhostApi from './utils/api';
+
+function sendEntryViewEvent({analyticsId, api}) {
+    if (analyticsId) {
+        api.analytics.pushEvent({
+            event_name: 'entry_view',
+            member_id: '',
+            member_status: '',
+            entry_id: analyticsId,
+            source_url: window.location.href
+        });
+    }
+}
+
+function setupAnalytics({siteUrl, analyticsId}) {
+    const GhostApi = setupGhostApi({siteUrl});
+    // Fire page/post view event
+    sendEntryViewEvent({analyticsId, api: GhostApi});
+    return {};
+}
+
+export default setupAnalytics;

ghost/portal/src/index.js

@@ -2,6 +2,7 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 import './index.css';
 import App from './App';
+import setupAnalytics from './analytics';
 
 const ROOT_DIV_ID = 'ghost-portal-root';
 
@@ -30,15 +31,24 @@ function handleTokenUrl() {
     }
 }
 
-function setup() {
+function setupAnalyticsScript({siteUrl}) {
+    const analyticsTag = document.querySelector('meta[name=ghost-analytics-id]');
+    const analyticsId = analyticsTag?.content;
+    if (siteUrl && analyticsTag) {
+        setupAnalytics({siteUrl, analyticsId});
+    }
+}
+
+function setup({siteUrl}) {
     addRootDiv();
     handleTokenUrl();
+    setupAnalyticsScript({siteUrl});
 }
 
 function init() {
     const customSiteUrl = getSiteUrl();
     const siteUrl = customSiteUrl || window.location.origin;
-    setup();
+    setup({siteUrl});
     ReactDOM.render(
         <React.StrictMode>
             <App siteUrl={siteUrl} customSiteUrl={customSiteUrl} />