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import axios from 'axios';
import { store } from 'themes/glitch/containers/mastodon';
import { setBrowserSupport, setSubscription, clearSubscription } from 'themes/glitch/actions/push_notifications';
// 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, '/');
const rawData = window.atob(base64);
const outputArray = new Uint8Array(rawData.length);
for (let i = 0; i < rawData.length; ++i) {
outputArray[i] = rawData.charCodeAt(i);
}
return outputArray;
};
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) =>
axios.post('/api/web/push_subscriptions', {
subscription,
}).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 () {
store.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 = store.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(sendSubscriptionToBackend);
}
}
// No subscription, try to subscribe
return subscribe(registration).then(sendSubscriptionToBackend);
})
.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)) {
store.dispatch(setSubscription(subscription));
}
})
.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
store.dispatch(clearSubscription());
try {
getRegistration()
.then(getPushSubscription)
.then(unsubscribe);
} catch (e) {
}
});
} else {
console.warn('Your browser does not support Web Push Notifications.');
}
}
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