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import api from '../../api';
import { decode as decodeBase64 } from '../../utils/base64';
import { pushNotificationsSetting } from '../../settings';
import { setBrowserSupport, setSubscription, clearSubscription } from './setter';
import { me } from '../../initial_state';
// 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);
};
}
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