Remove unnecessary service worker message types (#2268)

* Remove service worker logger

* Use async/await for togglePushSubscription

* Remove commented out logger calls in service worker

* Remove message channel between service worker and app

The listener for messages from the service worker was removed in a previous commit.

* Remove unused OS detection for service worker

* Formatting

* Remove unnecessary service worker message types

These messages types were meant to debug or fix push notifications getting lost.

We figured out the issue: push notifications were lost because of silent pushes.

So these message types are no longer needed.

---------

Co-authored-by: Keyan <34140557+huumn@users.noreply.github.com>

Author: ekzyis

components/serviceworker.js

@@ -7,11 +7,8 @@ const applicationServerKey = process.env.NEXT_PUBLIC_VAPID_PUBKEY
 const ServiceWorkerContext = createContext()
 
 // message types for communication between app and service worker
-export const ACTION_PORT = 'ACTION_PORT' // message to exchange action channel on which service worker will send actions back to app
-export const SYNC_SUBSCRIPTION = 'SYNC_SUBSCRIPTION' // trigger onPushSubscriptionChange event in service worker manually
-export const RESUBSCRIBE = 'RESUBSCRIBE' // trigger resubscribing to push notifications (sw -> app)
-export const DELETE_SUBSCRIPTION = 'DELETE_SUBSCRIPTION' // delete subscription in IndexedDB (app -> sw)
-export const STORE_SUBSCRIPTION = 'STORE_SUBSCRIPTION' // store subscription in IndexedDB (app -> sw)
+export const DELETE_SUBSCRIPTION = 'DELETE_SUBSCRIPTION'
+export const STORE_SUBSCRIPTION = 'STORE_SUBSCRIPTION'
 
 export const ServiceWorkerProvider = ({ children }) => {
   const [registration, setRegistration] = useState(null)
@@ -35,12 +32,12 @@ export const ServiceWorkerProvider = ({ children }) => {
     `)
   const [deletePushSubscription] = useMutation(
     gql`
-        mutation deletePushSubscription($endpoint: String!) {
-          deletePushSubscription(endpoint: $endpoint) {
-            id
-          }
+      mutation deletePushSubscription($endpoint: String!) {
+        deletePushSubscription(endpoint: $endpoint) {
+          id
         }
-      `)
+      }
+    `)
 
   // I am not entirely sure if this is needed since at least in Brave,
   // using `registration.pushManager.subscribe` also prompts the user.
@@ -94,8 +91,6 @@ export const ServiceWorkerProvider = ({ children }) => {
     await subscription.unsubscribe()
     const { endpoint } = subscription
     await deletePushSubscription({ variables: { endpoint } })
-    // also delete push subscription in IndexedDB so we can tell if the user disabled push subscriptions
-    // or we lost the push subscription due to a bug
     navigator.serviceWorker.controller.postMessage({ action: DELETE_SUBSCRIPTION })
   }
 
@@ -130,23 +125,6 @@ export const ServiceWorkerProvider = ({ children }) => {
     })
   }, [])
 
-  useEffect(() => {
-    // wait until successful registration
-    if (!registration) return
-    // setup channel between app and service worker
-    const channel = new MessageChannel()
-    navigator?.serviceWorker?.controller?.postMessage({ action: ACTION_PORT }, [channel.port2])
-    channel.port1.onmessage = (event) => {
-      if (event.data.action === RESUBSCRIBE && permission.notification === 'granted') {
-        return subscribeToPushNotifications()
-      }
-    }
-    // since (a lot of) browsers don't support the pushsubscriptionchange event,
-    // we sync with server manually by checking on every page reload if the push subscription changed.
-    // see https://medium.com/@madridserginho/how-to-handle-webpush-api-pushsubscriptionchange-event-in-modern-browsers-6e47840d756f
-    navigator?.serviceWorker?.controller?.postMessage?.({ action: SYNC_SUBSCRIPTION })
-  }, [registration, permission.notification])
-
   const contextValue = useMemo(() => ({
     registration,
     support,

sw/eventListener.js

@@ -1,15 +1,11 @@
 import ServiceWorkerStorage from 'serviceworker-storage'
 import { numWithUnits } from '@/lib/format'
 import { CLEAR_NOTIFICATIONS, clearAppBadge, setAppBadge } from '@/lib/badge'
-import { ACTION_PORT, DELETE_SUBSCRIPTION, STORE_SUBSCRIPTION, SYNC_SUBSCRIPTION } from '@/components/serviceworker'
+import { DELETE_SUBSCRIPTION, STORE_SUBSCRIPTION } from '@/components/serviceworker'
 
-// we store existing push subscriptions and OS to keep them in sync with server
+// we store existing push subscriptions for the onpushsubscriptionchange event
 const storage = new ServiceWorkerStorage('sw:storage', 1)
 
-// for communication between app and service worker
-// see https://developer.mozilla.org/en-US/docs/Web/API/MessageChannel
-let actionChannelPort
-
 // current push notification count for badge purposes
 let activeCount = 0
 
@@ -130,28 +126,14 @@ export function onNotificationClick (sw) {
 
 export function onPushSubscriptionChange (sw) {
   // https://medium.com/@madridserginho/how-to-handle-webpush-api-pushsubscriptionchange-event-in-modern-browsers-6e47840d756f
-  // `isSync` is passed if function was called because of 'SYNC_SUBSCRIPTION' event
-  // this makes sure we can differentiate between 'pushsubscriptionchange' events and our custom 'SYNC_SUBSCRIPTION' event
-  return async (event, isSync) => {
+  return async (event) => {
     let { oldSubscription, newSubscription } = event
     // https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/pushsubscriptionchange_event
     // fallbacks since browser may not set oldSubscription and newSubscription
     oldSubscription ??= await storage.getItem('subscription')
     newSubscription ??= await sw.registration.pushManager.getSubscription()
-    if (!newSubscription) {
-      if (isSync && oldSubscription?.swVersion === 2) {
-        // service worker lost the push subscription somehow, we assume this is a bug -> resubscribe
-        // see https://github.com/stackernews/stacker.news/issues/411#issuecomment-1790675861
-        // NOTE: this is only run on IndexedDB subscriptions stored under service worker version 2 since this is not backwards compatible
-        // see discussion in https://github.com/stackernews/stacker.news/pull/597
-        actionChannelPort?.postMessage({ action: 'RESUBSCRIBE' })
-        return
-      }
-      // no subscription exists at the moment
-      return
-    }
-    if (oldSubscription?.endpoint === newSubscription.endpoint) {
-      // subscription did not change. no need to sync with server
+    if (!newSubscription || oldSubscription?.endpoint === newSubscription.endpoint) {
+      // no subscription exists at the moment or subscription did not change
       return
     }
     // convert keys from ArrayBuffer to string
@@ -182,16 +164,9 @@ export function onPushSubscriptionChange (sw) {
 
 export function onMessage (sw) {
   return async (event) => {
-    if (event.data.action === ACTION_PORT) {
-      actionChannelPort = event.ports[0]
-      return
-    }
     if (event.data.action === STORE_SUBSCRIPTION) {
       return event.waitUntil(storage.setItem('subscription', { ...event.data.subscription, swVersion: 2 }))
     }
-    if (event.data.action === SYNC_SUBSCRIPTION) {
-      return event.waitUntil(onPushSubscriptionChange(sw)(event, true))
-    }
     if (event.data.action === DELETE_SUBSCRIPTION) {
       return event.waitUntil(storage.removeItem('subscription'))
     }