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import { Base64 } from '../utils/base64';
import { Logger } from '../utils/logger';
import { WorkerService } from './worker-service';
/**
* Configuration options for the push notification service.
* Defines optional settings for controlling service behavior and permission callbacks.
*/
export type PushServiceConfig = {
/**
* When true, disables the push notification service entirely.
*/
disablePushService?: boolean;
/**
* VAPID key required for push service authentication.
*/
vapidKey?: string;
/**
* Callback triggered when notification permission is in 'default' state.
*/
onPermissionDefault?: () => Promise<void>;
/**
* Callback triggered when notification permission is granted by the user.
*/
onPermissionGranted?: () => Promise<void>;
/**
* Callback triggered when notification permission is denied by the user.
*/
onPermissionDenied?: () => Promise<void>;
/**
* Optional function to convert base64 string to Uint8Array (for testability).
*/
urlBase64ToUint8Array?: (base64String: string) => Uint8Array;
};
/**
* Internal configuration type that extends PushServiceConfig with required
* callback handlers and optional browser API references.
*/
type PushServiceEffectiveConfig = {
/**
* Callback triggered when a push notification with call payload is received.
*
* @param payload - The call payload containing connection information
*/
onCall: (payload: CallPayload) => Promise<void>;
/**
* Optional Notification class reference for environments where global access is restricted.
*/
notification?: typeof Notification;
/**
* Optional PushManager class reference for environments where global access is restricted.
*/
pushManager?: typeof PushManager;
/**
* Optional function to convert url-safe base64 string to Uint8Array (for testability).
*/
urlBase64ToUint8Array?: (base64String: string) => Uint8Array;
} & PushServiceConfig;
/**
* Represents a push notification subscription with endpoint and encryption keys.
* Contains all the necessary information to deliver push messages to this device.
*/
export interface Subscription {
/**
* URL endpoint for the push service provider.
*/
endpoint: string;
/**
* Optional timestamp when this subscription expires, or null if it does not expire.
*/
expirationTime: number | null;
/**
* Cryptographic keys required for securing push notification payloads.
*/
keys: {
/**
* P-256 Diffie-Hellman public key for message encryption.
*/
p256dh: string;
/**
* Authentication secret for the subscription.
*/
auth: string;
};
}
/**
* Service interface for managing push notifications.
* Provides methods for initialization, subscription management, and displaying notifications.
*/
export interface PushService {
/**
* Initializes the push notification service with the provided configuration.
* Sets up event listeners, requests permissions if needed, and registers with push service.
*
* @param config - Configuration with callbacks and settings
* @returns Promise that resolves when initialization is complete
*/
initialize(config: PushServiceEffectiveConfig): Promise<void>;
/**
* Retrieves the current push notification subscription if available.
*
* @returns Promise resolving to the current subscription or undefined if not subscribed
*/
getSubscription(): Promise<Subscription | undefined>;
/**
* Displays a notification to the user, either through the service worker or directly.
*
* @param title - Title text of the notification
* @param options - Additional notification options like body text, icon, etc.
* @returns Boolean indicating if the notification was successfully displayed
*/
showNotification(title: string, options?: NotificationOptions): boolean;
}
/**
* Factory function that creates and returns an implementation of the PushService interface.
* Manages push notification subscriptions, permission handling, and notification display.
*
* @param logger - Logger instance for output of service events and errors
* @param workerService - Service for accessing the service worker registration
* @param base64 - Utility for Base64 encoding/decoding of subscription keys
* @returns An implementation of the PushService interface
*/
export function getPushService(logger: Logger, workerService: WorkerService, base64: Base64): PushService {
let subscription: Subscription | undefined;
let vapidKey: string | undefined;
let notification: typeof Notification | undefined;
let pushManager: typeof PushManager | undefined;
let urlBase64ToUint8Array: ((base64String: string) => Uint8Array) | undefined;
return {
async initialize(config: PushServiceEffectiveConfig): Promise<void> {
if (config.disablePushService) {
logger.warn('[push-service] Disabled.');
return;
}
if (!workerService.container) {
logger.warn('[push-service] Service Worker is not available.');
return;
}
notification = config.notification;
pushManager = config.pushManager;
urlBase64ToUint8Array = config.urlBase64ToUint8Array;
async function processMessage(payload: any) {
const { data } = payload;
if (!data) {
logger.error('[push-service] Invalid payload data.');
return;
}
const callPayload = data as CallPayload;
if (!callPayload || !callPayload.a) {
logger.error('[push-service] Invalid payload data.');
return;
}
if (!config.onCall) {
logger.warn('[push-service] Message callback is not initialized.');
return;
}
try {
await config.onCall(callPayload);
} catch (error) {
logger.error(`[push-service] Error while processing push call.`, error);
}
}
workerService.container.addEventListener('message', async (event: any) => {
if (event.data?.payload && event.data.type === 'PUSH_NOTIFICATION') {
logger.debug('[push-service] Message received from Service Worker:', event.data.payload);
await processMessage(event.data.payload);
}
});
vapidKey = config.vapidKey;
if (!config.vapidKey) {
logger.warn('[push-service] No vapid key found.');
return;
}
const Notification = notification;
if (!Notification) {
logger.warn('[push-service] Notifications are not supported.');
return;
}
let permission: NotificationPermission = Notification.permission;
const { onPermissionDefault, onPermissionGranted, onPermissionDenied } = config;
if (permission === 'default') {
if (onPermissionDefault) await onPermissionDefault();
permission = await Notification.requestPermission();
}
switch (permission) {
case 'granted':
logger.debug('[push-service] Notification permission granted.');
if (onPermissionGranted) await onPermissionGranted();
break;
case 'denied':
logger.error('[push-service] Notification permission denied.');
if (onPermissionDenied) await onPermissionDenied();
break;
case 'default':
logger.error('[push-service] Notification permission is still default.');
if (onPermissionDefault) await onPermissionDefault();
break;
}
logger.debug('[push-service] Initialized.');
},
async getSubscription(): Promise<Subscription | undefined> {
async function getPushSubscription(
urlBase64ToUint8Array: (base64String: string) => Uint8Array,
): Promise<PushSubscription | undefined> {
if (!pushManager) {
logger.warn('[push-service] PushManager is not available.');
return undefined;
}
async function unsubscribePushSubscription(subscription: PushSubscription): Promise<void> {
try {
await subscription.unsubscribe();
logger.debug(`[push-service] Unsubscribed.`);
} catch (err) {
logger.error('[push-service] An error occurred while cancelling the subscription.', err);
}
}
const registration = workerService.registration;
if (!registration) {
logger.warn('[push-service] Service Worker registration is not available.');
return undefined;
}
if (!vapidKey) {
logger.warn('[push-service] Vapid Key is not initialized.');
return undefined;
}
try {
const applicationServerKey = urlBase64ToUint8Array(vapidKey);
const currentSubscription = await registration.pushManager.getSubscription();
if (currentSubscription?.options?.applicationServerKey) {
const currentSubscriptionApplicationServerKey = new Uint8Array(
currentSubscription.options.applicationServerKey,
);
if (
base64.encode(currentSubscriptionApplicationServerKey) !==
base64.encode(applicationServerKey)
) {
logger.debug('[push-service] Another subscription found. Unsubscribing.');
await unsubscribePushSubscription(currentSubscription);
}
}
return await registration.pushManager.subscribe({
userVisibleOnly: true,
applicationServerKey: applicationServerKey,
});
} catch (err) {
logger.error('[push-service] An error occurred while obtaining the subscription.', err);
return undefined;
}
}
const Notification = notification;
if (!Notification) {
return undefined;
}
if (Notification.permission !== 'granted') {
logger.warn('[push-service] Notification permission was not granted.');
return undefined;
}
if (!urlBase64ToUint8Array) {
logger.warn('[push-service] UrlBase64ToUint8Array is not initialized.');
return undefined;
}
const pushSubscription = await getPushSubscription(urlBase64ToUint8Array);
if (!pushSubscription) {
return undefined;
}
if (!pushSubscription.endpoint) {
logger.warn('[push-service] Invalid subscription endpoint.');
return undefined;
}
const p256dhKey = pushSubscription.getKey('p256dh');
if (!p256dhKey || p256dhKey.byteLength === 0) {
logger.warn('[push-service] Invalid p256dh key.');
return undefined;
}
const authKey = pushSubscription.getKey('auth');
if (!authKey || authKey.byteLength === 0) {
logger.warn('[push-service] Invalid auth key.');
return undefined;
}
subscription = {
endpoint: pushSubscription.endpoint,
expirationTime: pushSubscription.expirationTime,
keys: {
p256dh: base64.encode(new Uint8Array(p256dhKey)),
auth: base64.encode(new Uint8Array(authKey)),
},
};
logger.debug('[push-service] Subscription:', JSON.stringify(subscription));
return subscription;
},
showNotification(title: string, options?: NotificationOptions) {
function showInternal() {
if (!workerService.controller?.postMessage) {
logger.warn('[push-service] Unable to show notification. Service worker is not initialized.');
return false;
}
if (!subscription) {
logger.warn('[push-service] Unable to show notification. Notifications unavailable.');
return false;
}
workerService.controller.postMessage({ type: 'SHOW_NOTIFICATION', title: title, options: options });
return true;
}
const shown = showInternal();
if (!shown) {
const Notification = notification;
if (Notification) {
new Notification(title, options);
return true;
}
return false;
}
return shown;
},
};
}
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