support checking if pusher is still present on server

src/matrix/Session.js

@@ -522,6 +522,18 @@ export class Session {
         const pusherData = await readTxn.session.get(PUSHER_KEY);
         return !!pusherData;
     }
+
+    async checkPusherEnabledOnHomeServer() {
+        const readTxn = await this._storage.readTxn([this._storage.storeNames.session]);
+        const pusherData = await readTxn.session.get(PUSHER_KEY);
+        if (!pusherData) {
+            return false;
+        }
+        const myPusher = new Pusher(pusherData);
+        const serverPushersData = await this._hsApi.getPushers().response();
+        const serverPushers = (serverPushersData?.pushers || []).map(data => new Pusher(data));
+        return serverPushers.some(p => p.equals(myPusher));
+    }
 }
 
 export function tests() {

src/matrix/net/HomeServerApi.js

@@ -258,6 +258,10 @@ export class HomeServerApi {
     setPusher(pusher, options = null) {
         return this._post("/pushers/set", null, pusher, options);
     }
+
+    getPushers(options = null) {
+        return this._get("/pushers", null, null, options);
+    }
 }
 
 export function tests() {

src/matrix/push/Pusher.js

@@ -37,4 +37,14 @@ export class Pusher {
     serialize() {
         return this._description;
     }
+
+    equals(pusher) {
+        if (this._description.app_id !== pusher._description.app_id) {
+            return false;
+        }
+        if (this._description.pushkey !== pusher._description.pushkey) {
+            return false;
+        }
+        return JSON.stringify(this._description.data) === JSON.stringify(pusher._description.data);
+    }
 }