Analytics fixes (closes #386) (#387)

* Only send analytics events when the user is logged in

* Only send analytics events when the user is logged in (web)

* Add analytics identify() call

src/lib/analytics.web.tsx

@@ -1,6 +1,12 @@
 import React from 'react'
-import {createClient, AnalyticsProvider} from '@segment/analytics-react'
+import {
+  createClient,
+  AnalyticsProvider,
+  useAnalytics as useAnalyticsOrig,
+} from '@segment/analytics-react'
 import {RootStoreModel} from 'state/models/root-store'
+import {useStores} from 'state/models/root-store'
+import {sha256} from 'js-sha256'
 
 const segmentClient = createClient(
   {
@@ -16,10 +22,40 @@ const segmentClient = createClient(
 )
 export const track = segmentClient?.track?.bind?.(segmentClient)
 
-export {useAnalytics} from '@segment/analytics-react'
+export function useAnalytics() {
+  const store = useStores()
+  const methods = useAnalyticsOrig()
+  return React.useMemo(() => {
+    if (store.session.hasSession) {
+      return methods
+    }
+    // dont send analytics pings for anonymous users
+    return {
+      screen: () => {},
+      track: () => {},
+      identify: () => {},
+      flush: () => {},
+      group: () => {},
+      alias: () => {},
+      reset: () => {},
+    }
+  }, [store, methods])
+}
 
-export function init(_store: RootStoreModel) {
-  // no init needed on web
+export function init(store: RootStoreModel) {
+  store.onSessionLoaded(() => {
+    const sess = store.session.currentSession
+    if (sess) {
+      if (sess.email) {
+        store.log.debug('Ping w/hash')
+        const email_hashed = sha256(sess.email)
+        segmentClient.identify(email_hashed, {email_hashed})
+      } else {
+        store.log.debug('Ping w/o hash')
+        segmentClient.identify()
+      }
+    }
+  })
 }
 
 export function Provider({children}: React.PropsWithChildren<{}>) {