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function urlBase64ToUint8Array (base64String) {
const padding = '='.repeat((4 - base64String.length % 4) % 4)
const base64 = (base64String + padding)
.replace(/-/g, '+')
.replace(/_/g, '/')
const rawData = window.atob(base64)
return Uint8Array.from([...rawData].map((char) => char.charCodeAt(0)))
}
function isPushSupported () {
return 'serviceWorker' in navigator && 'PushManager' in window
}
function registerServiceWorker () {
return navigator.serviceWorker.register('/static/sw.js')
.then(function (registration) {
console.log('Service worker successfully registered.')
return registration
})
.catch(function (err) {
console.error('Unable to register service worker.', err)
})
}
function askPermission () {
return new Promise(function (resolve, reject) {
if (!window.Notification) return reject(new Error('Notifications disabled'))
if (window.Notification.permission !== 'default') {
return resolve(window.Notification.permission)
}
const permissionResult = window.Notification.requestPermission(function (result) {
resolve(result)
})
if (permissionResult) permissionResult.then(resolve, reject)
}).then(function (permissionResult) {
if (permissionResult !== 'granted') {
throw new Error('We weren\'t granted permission.')
}
return permissionResult
})
}
function subscribe (registration, store) {
if (!store.rootState.config.webPushNotifications) {
return Promise.reject(new Error('Web Push is disabled in config'))
}
if (!store.rootState.instance.vapidPublicKey) {
return Promise.reject(new Error('VAPID publick key is not found'))
}
const subscribeOptions = {
userVisibleOnly: true,
applicationServerKey: urlBase64ToUint8Array(store.rootState.instance.vapidPublicKey)
}
return registration.pushManager.subscribe(subscribeOptions)
}
function sendSubscriptionToBackEnd (subscription, store) {
return window.fetch('/api/v1/push/subscription/', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Authorization': `Bearer ${store.rootState.oauth.token}`
},
body: JSON.stringify({
subscription,
data: {
alerts: {
follow: true,
favourite: true,
mention: true,
reblog: true
}
}
})
})
.then(function (response) {
if (!response.ok) {
throw new Error('Bad status code from server.')
}
return response.json()
})
.then(function (responseData) {
if (!responseData.id) {
throw new Error('Bad response from server.')
}
return responseData
})
}
export default function registerPushNotifications (store) {
if (isPushSupported()) {
registerServiceWorker()
.then(function (registration) {
return askPermission()
.then(() => subscribe(registration, store))
.then((subscription) => sendSubscriptionToBackEnd(subscription, store))
.catch((e) => console.warn(`Failed to setup Web Push Notifications: ${e.message}`))
})
}
}
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