import api from '../../api'; import { me } from '../../initial_state'; import { pushNotificationsSetting } from '../../settings'; import { decode as decodeBase64 } from '../../utils/base64'; import { setBrowserSupport, setSubscription, clearSubscription } from './setter'; // Taken from https://www.npmjs.com/package/web-push const urlBase64ToUint8Array = (base64String) => { const padding = '='.repeat((4 - base64String.length % 4) % 4); const base64 = (base64String + padding) .replace(/-/g, '+') .replace(/_/g, '/'); return decodeBase64(base64); }; const getApplicationServerKey = () => document.querySelector('[name="applicationServerKey"]').getAttribute('content'); const getRegistration = () => navigator.serviceWorker.ready; const getPushSubscription = (registration) => registration.pushManager.getSubscription() .then(subscription => ({ registration, subscription })); const subscribe = (registration) => registration.pushManager.subscribe({ userVisibleOnly: true, applicationServerKey: urlBase64ToUint8Array(getApplicationServerKey()), }); const unsubscribe = ({ registration, subscription }) => subscription ? subscription.unsubscribe().then(() => registration) : registration; const sendSubscriptionToBackend = (subscription) => { const params = { subscription }; if (me) { const data = pushNotificationsSetting.get(me); if (data) { params.data = data; } } return api().post('/api/web/push_subscriptions', params).then(response => response.data); }; // Last one checks for payload support: https://web-push-book.gauntface.com/chapter-06/01-non-standards-browsers/#no-payload const supportsPushNotifications = ('serviceWorker' in navigator && 'PushManager' in window && 'getKey' in PushSubscription.prototype); export function register () { return (dispatch, getState) => { dispatch(setBrowserSupport(supportsPushNotifications)); if (supportsPushNotifications) { if (!getApplicationServerKey()) { console.error('The VAPID public key is not set. You will not be able to receive Web Push Notifications.'); return; } getRegistration() .then(getPushSubscription) .then(({ registration, subscription }) => { if (subscription !== null) { // We have a subscription, check if it is still valid const currentServerKey = (new Uint8Array(subscription.options.applicationServerKey)).toString(); const subscriptionServerKey = urlBase64ToUint8Array(getApplicationServerKey()).toString(); const serverEndpoint = getState().getIn(['push_notifications', 'subscription', 'endpoint']); // If the VAPID public key did not change and the endpoint corresponds // to the endpoint saved in the backend, the subscription is valid if (subscriptionServerKey === currentServerKey && subscription.endpoint === serverEndpoint) { return subscription; } else { // Something went wrong, try to subscribe again return unsubscribe({ registration, subscription }).then(subscribe).then( subscription => sendSubscriptionToBackend(subscription)); } } // No subscription, try to subscribe return subscribe(registration).then( subscription => sendSubscriptionToBackend(subscription)); }) .then(subscription => { // If we got a PushSubscription (and not a subscription object from the backend) // it means that the backend subscription is valid (and was set during hydration) if (!(subscription instanceof PushSubscription)) { dispatch(setSubscription(subscription)); if (me) { pushNotificationsSetting.set(me, { alerts: subscription.alerts }); } } }) .catch(error => { if (error.code === 20 && error.name === 'AbortError') { console.warn('Your browser supports Web Push Notifications, but does not seem to implement the VAPID protocol.'); } else if (error.code === 5 && error.name === 'InvalidCharacterError') { console.error('The VAPID public key seems to be invalid:', getApplicationServerKey()); } // Clear alerts and hide UI settings dispatch(clearSubscription()); if (me) { pushNotificationsSetting.remove(me); } return getRegistration() .then(getPushSubscription) .then(unsubscribe); }) .catch(console.warn); } else { console.warn('Your browser does not support Web Push Notifications.'); } }; } export function saveSettings() { return (_, getState) => { const state = getState().get('push_notifications'); const subscription = state.get('subscription'); const alerts = state.get('alerts'); const data = { alerts }; api().put(`/api/web/push_subscriptions/${subscription.get('id')}`, { data, }).then(() => { if (me) { pushNotificationsSetting.set(me, data); } }).catch(console.warn); }; }