put web-specific parts of notifications (push and in-app) in platform

src/platform/web/dom/NotificationService.js

@@ -0,0 +1,101 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export class NotificationService {
+    constructor(serviceWorkerHandler, pushConfig) {
+        this._serviceWorkerHandler = serviceWorkerHandler;
+        this._pushConfig = pushConfig;
+    }
+
+    async enablePush(pusherFactory, defaultPayload) {
+        const registration = await this._serviceWorkerHandler?.getRegistration();
+        if (registration?.pushManager) {
+            const subscription = await registration.pushManager.subscribe({
+                userVisibleOnly: true,
+                applicationServerKey: this._pushConfig.applicationServerKey,
+            });
+            const subscriptionData = subscription.toJSON();
+            const pushkey = subscriptionData.keys.p256dh;
+            const data = {
+                endpoint: subscriptionData.endpoint,
+                auth: subscriptionData.keys.auth,
+                default_payload: defaultPayload
+            };
+            return pusherFactory.httpPusher(
+                this._pushConfig.gatewayUrl,
+                this._pushConfig.appId,
+                pushkey,
+                data
+            );
+        }
+    }
+
+    async disablePush() {
+        const registration = await this._serviceWorkerHandler?.getRegistration();
+        if (this.registration?.pushManager) {
+            const subscription = await registration.pushManager.getSubscription();
+            if (subscription) {
+                await subscription.unsubscribe();
+            }
+        }
+    }
+
+    async isPushEnabled() {
+        const registration = await this._serviceWorkerHandler?.getRegistration();
+        if (this.registration?.pushManager) {
+            const subscription = await registration.pushManager.getSubscription();
+            return !!subscription;
+        }
+        return false;
+    }
+
+    async supportsPush() {
+        if (!this._pushConfig) {
+            return false;
+        }
+        const registration = await this._serviceWorkerHandler?.getRegistration();
+        return registration && "pushManager" in registration;
+    }
+
+    async enableNotifications() {
+        if ("Notification" in window) {
+            return (await Notification.requestPermission()) === "granted";
+        }
+        return false;
+    }
+
+    async supportsNotifications() {
+        return "Notification" in window;
+    }
+
+    async areNotificationsEnabled() {
+        if ("Notification" in window) {
+            return Notification.permission === "granted";
+        } else {
+            return false;
+        }
+    }
+
+    async showNotification(title, body = undefined) {
+        if ("Notification" in window) {
+            new Notification(title, {body});
+            return;
+        }
+        // Chrome on Android does not support the Notification constructor
+        const registration = await this._serviceWorkerHandler?.getRegistration();
+        registration?.showNotification(title, {body});
+    }
+}

src/platform/web/dom/ServiceWorkerHandler.js

@@ -182,4 +182,11 @@ export class ServiceWorkerHandler {
     async preventConcurrentSessionAccess(sessionId) {
         return this._sendAndWaitForReply("closeSession", {sessionId});
     }
+
+    async getRegistration() {
+        if (this._registrationPromise) {
+            await this._registrationPromise;
+        }
+        return this._registration;
+    }
 }