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fix: iOS pwa push notifications
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@Soxasora
Soxasora committed Jan 6, 2025
1 parent 29c31e3 commit 261c377
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Showing 2 changed files with 59 additions and 101 deletions.
13 changes: 7 additions & 6 deletions lib/badge.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,19 +15,20 @@ const permissionGranted = async (sw = window) => {
return permission?.state === 'granted' || sw.Notification?.permission === 'granted'
}

export const setAppBadge = async (sw = window, count) => {
if (!badgingApiSupported(sw) || !(await permissionGranted(sw))) return
// Apple requirement: onPush doesn't accept async functions
export const setAppBadge = (sw = window, count) => {
if (!badgingApiSupported(sw)) return
try {
await sw.navigator.setAppBadge(count)
return sw.navigator.setAppBadge(count) // Return a Promise to be handled
} catch (err) {
console.error('Failed to set app badge', err)
}
}

export const clearAppBadge = async (sw = window) => {
if (!badgingApiSupported(sw) || !(await permissionGranted(sw))) return
export const clearAppBadge = (sw = window) => {
if (!badgingApiSupported(sw)) return
try {
await sw.navigator.clearAppBadge()
return sw.navigator.clearAppBadge() // Return a Promise to be handled
} catch (err) {
console.error('Failed to clear app badge', err)
}
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147 changes: 52 additions & 95 deletions sw/eventListener.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ import ServiceWorkerStorage from 'serviceworker-storage'
import { numWithUnits } from '@/lib/format'
import { CLEAR_NOTIFICATIONS, clearAppBadge, setAppBadge } from '@/lib/badge'
import { ACTION_PORT, DELETE_SUBSCRIPTION, MESSAGE_PORT, STORE_OS, STORE_SUBSCRIPTION, SYNC_SUBSCRIPTION } from '@/components/serviceworker'
// import { getLogger } from '@/lib/logger'

// we store existing push subscriptions to keep them in sync with server
const storage = new ServiceWorkerStorage('sw:storage', 1)
Expand All @@ -28,70 +29,34 @@ const log = (message, level = 'info', context) => {
}

export function onPush (sw) {
return async (event) => {
const payload = event.data?.json()
return (event) => {
// const logger = getLogger('sw:push', ['onPush'])
let payload = event.data?.json()
if (!payload) return
const { tag } = payload.options
event.waitUntil((async () => {
const iOS = await getOS() === 'iOS'
// generate random ID for every incoming push for better tracing in logs
const nid = crypto.randomUUID()
log(`[sw:push] ${nid} - received notification with tag ${tag}`)

// due to missing proper tag support in Safari on iOS, we can't rely on the tag built-in filter.
// we therefore fetch all notifications with the same tag and manually filter them, too.
// see https://bugs.webkit.org/show_bug.cgi?id=258922
const notifications = await sw.registration.getNotifications({ tag })
log(`[sw:push] ${nid} - found ${notifications.length} ${tag} notifications`)
log(`[sw:push] ${nid} - built-in tag filter: ${JSON.stringify(notifications.map(({ tag }) => tag))}`)

// we're not sure if the built-in tag filter actually filters by tag on iOS
// or if it just returns all currently displayed notifications (?)
const filtered = notifications.filter(({ tag: nTag }) => nTag === tag)
log(`[sw:push] ${nid} - found ${filtered.length} ${tag} notifications after manual tag filter`)
log(`[sw:push] ${nid} - manual tag filter: ${JSON.stringify(filtered.map(({ tag }) => tag))}`)

if (immediatelyShowNotification(tag)) {
// we can't rely on the tag property to replace notifications on Safari on iOS.
// we therefore close them manually and then we display the notification.
log(`[sw:push] ${nid} - ${tag} notifications replace previous notifications`)
setAppBadge(sw, ++activeCount)
// due to missing proper tag support in Safari on iOS, we can't rely on the tag property to replace notifications.
// see https://bugs.webkit.org/show_bug.cgi?id=258922 for more information
// we therefore fetch all notifications with the same tag (+ manual filter),
// close them and then we display the notification.
const notifications = await sw.registration.getNotifications({ tag })
// we only close notifications manually on iOS because we don't want to degrade android UX just because iOS is behind in their support.
if (iOS) {
log(`[sw:push] ${nid} - closing existing notifications`)
notifications.filter(({ tag: nTag }) => nTag === tag).forEach(n => n.close())
const nid = crypto.randomUUID()

// iOS requirement: group all promises
const promises = []

// On immediate notifications we update the counter
if (immediatelyShowNotification(tag)) {
// logger.info(`[${nid}] showing immediate notification with title: ${payload.title}`)
promises.push(setAppBadge(sw, ++activeCount))
} else { // Check if there are already notifications with the same tag and merge them
// logger.info(`[${nid}] checking for existing notification with tag ${tag}`)
promises.push(sw.registration.getNotifications({ tag }).then((notifications) => {
if (notifications.length) {
// logger.info(`[${nid}] found ${notifications.length} notifications with tag ${tag}`)
payload = mergeNotification(event, sw, payload, notifications, tag, nid)
}
log(`[sw:push] ${nid} - show notification with title "${payload.title}"`)
return await sw.registration.showNotification(payload.title, payload.options)
}

// according to the spec, there should only be zero or one notification since we used a tag filter
// handle zero case here
if (notifications.length === 0) {
// incoming notification is first notification with this tag
log(`[sw:push] ${nid} - no existing ${tag} notifications found`)
setAppBadge(sw, ++activeCount)
log(`[sw:push] ${nid} - show notification with title "${payload.title}"`)
return await sw.registration.showNotification(payload.title, payload.options)
}

// handle unexpected case here
if (notifications.length > 1) {
log(`[sw:push] ${nid} - more than one notification with tag ${tag} found`, 'error')
// due to missing proper tag support in Safari on iOS,
// we only acknowledge this error in our logs and don't bail here anymore
// see https://bugs.webkit.org/show_bug.cgi?id=258922 for more information
log(`[sw:push] ${nid} - skip bail -- merging notifications with tag ${tag} manually`)
// return null
}
}))
}

return await mergeAndShowNotification(sw, payload, notifications, tag, nid, iOS)
})())
// Apple requirement: wait for all promises to resolve
event.waitUntil(Promise.all(promises).then(() => {
sw.registration.showNotification(payload.title, payload.options)
}))
}
}

Expand All @@ -100,22 +65,22 @@ export function onPush (sw) {
const immediatelyShowNotification = (tag) =>
!tag || ['TIP', 'FORWARDEDTIP', 'EARN', 'STREAK', 'TERRITORY_TRANSFER'].includes(tag.split('-')[0])

const mergeAndShowNotification = async (sw, payload, currentNotifications, tag, nid, iOS) => {
const mergeNotification = (event, sw, payload, currentNotifications, tag, nid) => {
// const logger = getLogger('sw:push:mergeNotification', ['mergeNotification'])
// sanity check
const otherTagNotifications = currentNotifications.filter(({ tag: nTag }) => nTag !== tag)
if (otherTagNotifications.length > 0) {
// we can't recover from this here. bail.
const message = `[sw:push] ${nid} - bailing -- more than one notification with tag ${tag} found after manual filter`
log(message, 'error')
// logger.error(`${nid} - bailing -- more than one notification with tag ${tag} found after manual filter`)
return
}

const { data: incomingData } = payload.options
log(`[sw:push] ${nid} - incoming payload.options.data: ${JSON.stringify(incomingData)}`)
// logger.info(`[sw:push] ${nid} - incoming payload.options.data: ${JSON.stringify(incomingData)}`)

// we can ignore everything after the first dash in the tag for our control flow
const compareTag = tag.split('-')[0]
log(`[sw:push] ${nid} - using ${compareTag} for control flow`)
// logger.info(`[sw:push] ${nid} - using ${compareTag} for control flow`)

// merge notifications into single notification payload
// ---
Expand All @@ -124,22 +89,18 @@ const mergeAndShowNotification = async (sw, payload, currentNotifications, tag,
// tags that need to know the sum of sats of notifications with same tag for merging
const SUM_SATS_TAGS = ['DEPOSIT', 'WITHDRAWAL']
// this should reflect the amount of notifications that were already merged before
let initialAmount = currentNotifications[0]?.data?.amount || 1
if (iOS) initialAmount = 1
log(`[sw:push] ${nid} - initial amount: ${initialAmount}`)
const mergedPayload = currentNotifications.reduce((acc, { data }) => {
let newAmount, newSats
if (AMOUNT_TAGS.includes(compareTag)) {
newAmount = acc.amount + 1
}
if (SUM_SATS_TAGS.includes(compareTag)) {
newSats = acc.sats + data.sats
}
const newPayload = { ...data, amount: newAmount, sats: newSats }
return newPayload
}, { ...incomingData, amount: initialAmount })
const initialAmount = currentNotifications[0]?.data?.amount || 1
const initialSats = currentNotifications[0]?.data?.sats || 0
// logger.info(`[sw:push] ${nid} - initial amount: ${initialAmount}`)
// logger.info(`[sw:push] ${nid} - initial sats: ${initialSats}`)

const mergedPayload = {
...incomingData,
amount: initialAmount + 1,
sats: initialSats + incomingData.sats
}

log(`[sw:push] ${nid} - merged payload: ${JSON.stringify(mergedPayload)}`)
// logger.info(`[sw:push] ${nid} - merged payload: ${JSON.stringify(mergedPayload)}`)

// calculate title from merged payload
const { amount, followeeName, subName, subType, sats } = mergedPayload
Expand Down Expand Up @@ -167,23 +128,18 @@ const mergeAndShowNotification = async (sw, payload, currentNotifications, tag,
title = `${numWithUnits(sats, { abbreviate: false, unitSingular: 'sat was', unitPlural: 'sats were' })} withdrawn from your account`
}
}
log(`[sw:push] ${nid} - calculated title: ${title}`)

// close all current notifications before showing new one to "merge" notifications
// we only do this on iOS because we don't want to degrade android UX just because iOS is behind in their support.
if (iOS) {
log(`[sw:push] ${nid} - closing existing notifications`)
currentNotifications.forEach(n => n.close())
}
// logger.info(`[sw:push] ${nid} - calculated title: ${title}`)

const options = { icon: payload.options?.icon, tag, data: { url: '/notifications', ...mergedPayload } }
log(`[sw:push] ${nid} - show notification with title "${title}"`)
return await sw.registration.showNotification(title, options)
// logger.info(`[sw:push] ${nid} - show notification with title "${title}"`)
return { title, options }
}

export function onNotificationClick (sw) {
return (event) => {
// const logger = getLogger('sw:onNotificationClick', ['onNotificationClick'])
const url = event.notification.data?.url
// logger.info(`[sw:onNotificationClick] clicked notification with url ${url}`)
if (url) {
event.waitUntil(sw.clients.openWindow(url))
}
Expand All @@ -202,10 +158,11 @@ export function onPushSubscriptionChange (sw) {
// `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) => {
// const logger = getLogger('sw:onPushSubscriptionChange', ['onPushSubscriptionChange'])
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
log('[sw:handlePushSubscriptionChange] invoked')
// logger.info('[sw:handlePushSubscriptionChange] invoked')
oldSubscription ??= await storage.getItem('subscription')
newSubscription ??= await sw.registration.pushManager.getSubscription()
if (!newSubscription) {
Expand All @@ -214,17 +171,17 @@ export function onPushSubscriptionChange (sw) {
// 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
log('[sw:handlePushSubscriptionChange] service worker lost subscription')
// logger.info('[sw:handlePushSubscriptionChange] service worker lost subscription')
actionChannelPort?.postMessage({ action: 'RESUBSCRIBE' })
return
}
// no subscription exists at the moment
log('[sw:handlePushSubscriptionChange] no existing subscription found')
// logger.info('[sw:handlePushSubscriptionChange] no existing subscription found')
return
}
if (oldSubscription?.endpoint === newSubscription.endpoint) {
// subscription did not change. no need to sync with server
log('[sw:handlePushSubscriptionChange] old subscription matches existing subscription')
// logger.info('[sw:handlePushSubscriptionChange] old subscription matches existing subscription')
return
}
// convert keys from ArrayBuffer to string
Expand All @@ -249,7 +206,7 @@ export function onPushSubscriptionChange (sw) {
},
body
})
log('[sw:handlePushSubscriptionChange] synced push subscription with server', 'info', { endpoint: variables.endpoint, oldEndpoint: variables.oldEndpoint })
// logger.info('[sw:handlePushSubscriptionChange] synced push subscription with server', 'info', { endpoint: variables.endpoint, oldEndpoint: variables.oldEndpoint })
await storage.setItem('subscription', JSON.parse(JSON.stringify(newSubscription)))
}
}
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