@angular/service-worker
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Angular - service worker tooling!
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JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Injectable } from '@angular/core';
import { merge, NEVER, Subject } from 'rxjs';
import { map, switchMap, take } from 'rxjs/operators';
import { ERR_SW_NOT_SUPPORTED, NgswCommChannel } from './low_level';
import * as i0 from "@angular/core";
import * as i1 from "./low_level";
/**
* Subscribe and listen to
* [Web Push
* Notifications](https://developer.mozilla.org/en-US/docs/Web/API/Push_API/Best_Practices) through
* Angular Service Worker.
*
* @usageNotes
*
* You can inject a `SwPush` instance into any component or service
* as a dependency.
*
* <code-example path="service-worker/push/module.ts" region="inject-sw-push"
* header="app.component.ts"></code-example>
*
* To subscribe, call `SwPush.requestSubscription()`, which asks the user for permission.
* The call returns a `Promise` with a new
* [`PushSubscription`](https://developer.mozilla.org/en-US/docs/Web/API/PushSubscription)
* instance.
*
* <code-example path="service-worker/push/module.ts" region="subscribe-to-push"
* header="app.component.ts"></code-example>
*
* A request is rejected if the user denies permission, or if the browser
* blocks or does not support the Push API or ServiceWorkers.
* Check `SwPush.isEnabled` to confirm status.
*
* Invoke Push Notifications by pushing a message with the following payload.
*
* ```ts
* {
* "notification": {
* "actions": NotificationAction[],
* "badge": USVString,
* "body": DOMString,
* "data": any,
* "dir": "auto"|"ltr"|"rtl",
* "icon": USVString,
* "image": USVString,
* "lang": DOMString,
* "renotify": boolean,
* "requireInteraction": boolean,
* "silent": boolean,
* "tag": DOMString,
* "timestamp": DOMTimeStamp,
* "title": DOMString,
* "vibrate": number[]
* }
* }
* ```
*
* Only `title` is required. See `Notification`
* [instance
* properties](https://developer.mozilla.org/en-US/docs/Web/API/Notification#Instance_properties).
*
* While the subscription is active, Service Worker listens for
* [PushEvent](https://developer.mozilla.org/en-US/docs/Web/API/PushEvent)
* occurrences and creates
* [Notification](https://developer.mozilla.org/en-US/docs/Web/API/Notification)
* instances in response.
*
* Unsubscribe using `SwPush.unsubscribe()`.
*
* An application can subscribe to `SwPush.notificationClicks` observable to be notified when a user
* clicks on a notification. For example:
*
* <code-example path="service-worker/push/module.ts" region="subscribe-to-notification-clicks"
* header="app.component.ts"></code-example>
*
* You can read more on handling notification clicks in the [Service worker notifications
* guide](guide/service-worker-notifications).
*
* @see [Push Notifications](https://developers.google.com/web/fundamentals/codelabs/push-notifications/)
* @see [Angular Push Notifications](https://blog.angular-university.io/angular-push-notifications/)
* @see [MDN: Push API](https://developer.mozilla.org/en-US/docs/Web/API/Push_API)
* @see [MDN: Notifications API](https://developer.mozilla.org/en-US/docs/Web/API/Notifications_API)
* @see [MDN: Web Push API Notifications best practices](https://developer.mozilla.org/en-US/docs/Web/API/Push_API/Best_Practices)
*
* @publicApi
*/
export class SwPush {
constructor(sw) {
this.sw = sw;
this.subscriptionChanges = new Subject();
if (!sw.isEnabled) {
this.messages = NEVER;
this.notificationClicks = NEVER;
this.subscription = NEVER;
return;
}
this.messages = this.sw.eventsOfType('PUSH').pipe(map(message => message.data));
this.notificationClicks =
this.sw.eventsOfType('NOTIFICATION_CLICK').pipe(map((message) => message.data));
this.pushManager = this.sw.registration.pipe(map(registration => registration.pushManager));
const workerDrivenSubscriptions = this.pushManager.pipe(switchMap(pm => pm.getSubscription()));
this.subscription = merge(workerDrivenSubscriptions, this.subscriptionChanges);
}
/**
* True if the Service Worker is enabled (supported by the browser and enabled via
* `ServiceWorkerModule`).
*/
get isEnabled() {
return this.sw.isEnabled;
}
/**
* Subscribes to Web Push Notifications,
* after requesting and receiving user permission.
*
* @param options An object containing the `serverPublicKey` string.
* @returns A Promise that resolves to the new subscription object.
*/
requestSubscription(options) {
if (!this.sw.isEnabled) {
return Promise.reject(new Error(ERR_SW_NOT_SUPPORTED));
}
const pushOptions = { userVisibleOnly: true };
let key = this.decodeBase64(options.serverPublicKey.replace(/_/g, '/').replace(/-/g, '+'));
let applicationServerKey = new Uint8Array(new ArrayBuffer(key.length));
for (let i = 0; i < key.length; i++) {
applicationServerKey[i] = key.charCodeAt(i);
}
pushOptions.applicationServerKey = applicationServerKey;
return this.pushManager.pipe(switchMap(pm => pm.subscribe(pushOptions)), take(1))
.toPromise()
.then(sub => {
this.subscriptionChanges.next(sub);
return sub;
});
}
/**
* Unsubscribes from Service Worker push notifications.
*
* @returns A Promise that is resolved when the operation succeeds, or is rejected if there is no
* active subscription or the unsubscribe operation fails.
*/
unsubscribe() {
if (!this.sw.isEnabled) {
return Promise.reject(new Error(ERR_SW_NOT_SUPPORTED));
}
const doUnsubscribe = (sub) => {
if (sub === null) {
throw new Error('Not subscribed to push notifications.');
}
return sub.unsubscribe().then(success => {
if (!success) {
throw new Error('Unsubscribe failed!');
}
this.subscriptionChanges.next(null);
});
};
return this.subscription.pipe(take(1), switchMap(doUnsubscribe)).toPromise();
}
decodeBase64(input) {
return atob(input);
}
}
SwPush.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.4", ngImport: i0, type: SwPush, deps: [{ token: i1.NgswCommChannel }], target: i0.ɵɵFactoryTarget.Injectable });
SwPush.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.0.4", ngImport: i0, type: SwPush });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.4", ngImport: i0, type: SwPush, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i1.NgswCommChannel }]; } });
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Injectable} from '@angular/core';\nimport {merge, NEVER, Observable, Subject} from 'rxjs';\nimport {map, switchMap, take} from 'rxjs/operators';\n\nimport {ERR_SW_NOT_SUPPORTED, NgswCommChannel, PushEvent} from './low_level';\n\n\n/**\n * Subscribe and listen to\n * [Web Push\n * Notifications](https://developer.mozilla.org/en-US/docs/Web/API/Push_API/Best_Practices) through\n * Angular Service Worker.\n *\n * @usageNotes\n *\n * You can inject a `SwPush` instance into any component or service\n * as a dependency.\n *\n * <code-example path=\"service-worker/push/module.ts\" region=\"inject-sw-push\"\n * header=\"app.component.ts\"></code-example>\n *\n * To subscribe, call `SwPush.requestSubscription()`, which asks the user for permission.\n * The call returns a `Promise` with a new\n * [`PushSubscription`](https://developer.mozilla.org/en-US/docs/Web/API/PushSubscription)\n * instance.\n *\n * <code-example path=\"service-worker/push/module.ts\" region=\"subscribe-to-push\"\n * header=\"app.component.ts\"></code-example>\n *\n * A request is rejected if the user denies permission, or if the browser\n * blocks or does not support the Push API or ServiceWorkers.\n * Check `SwPush.isEnabled` to confirm status.\n *\n * Invoke Push Notifications by pushing a message with the following payload.\n *\n * ```ts\n * {\n *   \"notification\": {\n *     \"actions\": NotificationAction[],\n *     \"badge\": USVString,\n *     \"body\": DOMString,\n *     \"data\": any,\n *     \"dir\": \"auto\"|\"ltr\"|\"rtl\",\n *     \"icon\": USVString,\n *     \"image\": USVString,\n *     \"lang\": DOMString,\n *     \"renotify\": boolean,\n *     \"requireInteraction\": boolean,\n *     \"silent\": boolean,\n *     \"tag\": DOMString,\n *     \"timestamp\": DOMTimeStamp,\n *     \"title\": DOMString,\n *     \"vibrate\": number[]\n *   }\n * }\n * ```\n *\n * Only `title` is required. See `Notification`\n * [instance\n * properties](https://developer.mozilla.org/en-US/docs/Web/API/Notification#Instance_properties).\n *\n * While the subscription is active, Service Worker listens for\n * [PushEvent](https://developer.mozilla.org/en-US/docs/Web/API/PushEvent)\n * occurrences and creates\n * [Notification](https://developer.mozilla.org/en-US/docs/Web/API/Notification)\n * instances in response.\n *\n * Unsubscribe using `SwPush.unsubscribe()`.\n *\n * An application can subscribe to `SwPush.notificationClicks` observable to be notified when a user\n * clicks on a notification. For example:\n *\n * <code-example path=\"service-worker/push/module.ts\" region=\"subscribe-to-notification-clicks\"\n * header=\"app.component.ts\"></code-example>\n *\n * You can read more on handling notification clicks in the [Service worker notifications\n * guide](guide/service-worker-notifications).\n *\n * @see [Push Notifications](https://developers.google.com/web/fundamentals/codelabs/push-notifications/)\n * @see [Angular Push Notifications](https://blog.angular-university.io/angular-push-notifications/)\n * @see [MDN: Push API](https://developer.mozilla.org/en-US/docs/Web/API/Push_API)\n * @see [MDN: Notifications API](https://developer.mozilla.org/en-US/docs/Web/API/Notifications_API)\n * @see [MDN: Web Push API Notifications best practices](https://developer.mozilla.org/en-US/docs/Web/API/Push_API/Best_Practices)\n *\n * @publicApi\n */\n@Injectable()\nexport class SwPush {\n  /**\n   * Emits the payloads of the received push notification messages.\n   */\n  readonly messages: Observable<object>;\n\n  /**\n   * Emits the payloads of the received push notification messages as well as the action the user\n   * interacted with. If no action was used the `action` property contains an empty string `''`.\n   *\n   * Note that the `notification` property does **not** contain a\n   * [Notification][Mozilla Notification] object but rather a\n   * [NotificationOptions](https://notifications.spec.whatwg.org/#dictdef-notificationoptions)\n   * object that also includes the `title` of the [Notification][Mozilla Notification] object.\n   *\n   * [Mozilla Notification]: https://developer.mozilla.org/en-US/docs/Web/API/Notification\n   */\n  readonly notificationClicks: Observable<{\n    action: string; notification: NotificationOptions &\n        {\n          title: string\n        }\n  }>;\n\n  /**\n   * Emits the currently active\n   * [PushSubscription](https://developer.mozilla.org/en-US/docs/Web/API/PushSubscription)\n   * associated to the Service Worker registration or `null` if there is no subscription.\n   */\n  readonly subscription: Observable<PushSubscription|null>;\n\n  /**\n   * True if the Service Worker is enabled (supported by the browser and enabled via\n   * `ServiceWorkerModule`).\n   */\n  get isEnabled(): boolean {\n    return this.sw.isEnabled;\n  }\n\n  // TODO(issue/24571): remove '!'.\n  private pushManager!: Observable<PushManager>;\n  private subscriptionChanges = new Subject<PushSubscription|null>();\n\n  constructor(private sw: NgswCommChannel) {\n    if (!sw.isEnabled) {\n      this.messages = NEVER;\n      this.notificationClicks = NEVER;\n      this.subscription = NEVER;\n      return;\n    }\n\n    this.messages = this.sw.eventsOfType<PushEvent>('PUSH').pipe(map(message => message.data));\n\n    this.notificationClicks =\n        this.sw.eventsOfType('NOTIFICATION_CLICK').pipe(map((message: any) => message.data));\n\n    this.pushManager = this.sw.registration.pipe(map(registration => registration.pushManager));\n\n    const workerDrivenSubscriptions = this.pushManager.pipe(switchMap(pm => pm.getSubscription()));\n    this.subscription = merge(workerDrivenSubscriptions, this.subscriptionChanges);\n  }\n\n  /**\n   * Subscribes to Web Push Notifications,\n   * after requesting and receiving user permission.\n   *\n   * @param options An object containing the `serverPublicKey` string.\n   * @returns A Promise that resolves to the new subscription object.\n   */\n  requestSubscription(options: {serverPublicKey: string}): Promise<PushSubscription> {\n    if (!this.sw.isEnabled) {\n      return Promise.reject(new Error(ERR_SW_NOT_SUPPORTED));\n    }\n    const pushOptions: PushSubscriptionOptionsInit = {userVisibleOnly: true};\n    let key = this.decodeBase64(options.serverPublicKey.replace(/_/g, '/').replace(/-/g, '+'));\n    let applicationServerKey = new Uint8Array(new ArrayBuffer(key.length));\n    for (let i = 0; i < key.length; i++) {\n      applicationServerKey[i] = key.charCodeAt(i);\n    }\n    pushOptions.applicationServerKey = applicationServerKey;\n\n    return this.pushManager.pipe(switchMap(pm => pm.subscribe(pushOptions)), take(1))\n        .toPromise()\n        .then(sub => {\n          this.subscriptionChanges.next(sub);\n          return sub;\n        });\n  }\n\n  /**\n   * Unsubscribes from Service Worker push notifications.\n   *\n   * @returns A Promise that is resolved when the operation succeeds, or is rejected if there is no\n   *          active subscription or the unsubscribe operation fails.\n   */\n  unsubscribe(): Promise<void> {\n    if (!this.sw.isEnabled) {\n      return Promise.reject(new Error(ERR_SW_NOT_SUPPORTED));\n    }\n\n    const doUnsubscribe = (sub: PushSubscription|null) => {\n      if (sub === null) {\n        throw new Error('Not subscribed to push notifications.');\n      }\n\n      return sub.unsubscribe().then(success => {\n        if (!success) {\n          throw new Error('Unsubscribe failed!');\n        }\n\n        this.subscriptionChanges.next(null);\n      });\n    };\n\n    return this.subscription.pipe(take(1), switchMap(doUnsubscribe)).toPromise();\n  }\n\n  private decodeBase64(input: string): string {\n    return atob(input);\n  }\n}\n"]}