105 lines
4.2 KiB
JavaScript
105 lines
4.2 KiB
JavaScript
import axios from 'axios';
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import { store } from 'flavours/glitch/containers/mastodon';
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import { setBrowserSupport, setSubscription, clearSubscription } from 'flavours/glitch/actions/push_notifications';
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// Taken from https://www.npmjs.com/package/web-push
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const urlBase64ToUint8Array = (base64String) => {
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const padding = '='.repeat((4 - base64String.length % 4) % 4);
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const base64 = (base64String + padding)
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.replace(/\-/g, '+')
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.replace(/_/g, '/');
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const rawData = window.atob(base64);
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const outputArray = new Uint8Array(rawData.length);
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for (let i = 0; i < rawData.length; ++i) {
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outputArray[i] = rawData.charCodeAt(i);
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}
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return outputArray;
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};
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const getApplicationServerKey = () => document.querySelector('[name="applicationServerKey"]').getAttribute('content');
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const getRegistration = () => navigator.serviceWorker.ready;
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const getPushSubscription = (registration) =>
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registration.pushManager.getSubscription()
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.then(subscription => ({ registration, subscription }));
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const subscribe = (registration) =>
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registration.pushManager.subscribe({
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userVisibleOnly: true,
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applicationServerKey: urlBase64ToUint8Array(getApplicationServerKey()),
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});
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const unsubscribe = ({ registration, subscription }) =>
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subscription ? subscription.unsubscribe().then(() => registration) : registration;
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const sendSubscriptionToBackend = (subscription) =>
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axios.post('/api/web/push_subscriptions', {
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subscription,
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}).then(response => response.data);
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// Last one checks for payload support: https://web-push-book.gauntface.com/chapter-06/01-non-standards-browsers/#no-payload
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const supportsPushNotifications = ('serviceWorker' in navigator && 'PushManager' in window && 'getKey' in PushSubscription.prototype);
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export function register () {
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store.dispatch(setBrowserSupport(supportsPushNotifications));
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if (supportsPushNotifications) {
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if (!getApplicationServerKey()) {
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console.error('The VAPID public key is not set. You will not be able to receive Web Push Notifications.');
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return;
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}
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getRegistration()
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.then(getPushSubscription)
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.then(({ registration, subscription }) => {
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if (subscription !== null) {
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// We have a subscription, check if it is still valid
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const currentServerKey = (new Uint8Array(subscription.options.applicationServerKey)).toString();
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const subscriptionServerKey = urlBase64ToUint8Array(getApplicationServerKey()).toString();
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const serverEndpoint = store.getState().getIn(['push_notifications', 'subscription', 'endpoint']);
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// If the VAPID public key did not change and the endpoint corresponds
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// to the endpoint saved in the backend, the subscription is valid
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if (subscriptionServerKey === currentServerKey && subscription.endpoint === serverEndpoint) {
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return subscription;
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} else {
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// Something went wrong, try to subscribe again
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return unsubscribe({ registration, subscription }).then(subscribe).then(sendSubscriptionToBackend);
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}
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}
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// No subscription, try to subscribe
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return subscribe(registration).then(sendSubscriptionToBackend);
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})
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.then(subscription => {
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// If we got a PushSubscription (and not a subscription object from the backend)
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// it means that the backend subscription is valid (and was set during hydration)
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if (!(subscription instanceof PushSubscription)) {
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store.dispatch(setSubscription(subscription));
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}
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})
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.catch(error => {
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if (error.code === 20 && error.name === 'AbortError') {
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console.warn('Your browser supports Web Push Notifications, but does not seem to implement the VAPID protocol.');
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} else if (error.code === 5 && error.name === 'InvalidCharacterError') {
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console.error('The VAPID public key seems to be invalid:', getApplicationServerKey());
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}
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// Clear alerts and hide UI settings
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store.dispatch(clearSubscription());
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try {
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getRegistration()
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.then(getPushSubscription)
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.then(unsubscribe);
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} catch (e) {
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}
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});
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} else {
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console.warn('Your browser does not support Web Push Notifications.');
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}
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}
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