Call RustBackupManager.checkKeyBackupAndEnable when RustCrypto is created (#3784)

spec/unit/rust-crypto/rust-crypto.spec.ts

@@ -44,6 +44,7 @@ import {
     EventShieldColour,
     EventShieldReason,
     ImportRoomKeysOpts,
+    KeyBackupCheck,
     VerificationRequest,
 } from "../../../src/crypto-api";
 import * as testData from "../../test-utils/test-data";
@@ -864,8 +865,23 @@ describe("RustCrypto", () => {
         });
     });
 
-    describe("onUserIdentityUpdated", () => {
+    describe("key backup", () => {
+        it("is started when rust crypto is created", async () => {
+            // `RustCrypto.checkKeyBackupAndEnable` async call is made in background in the RustCrypto constructor.
+            // We don't have an instance of the rust crypto yet, we spy directly in the prototype.
+            const spyCheckKeyBackupAndEnable = jest
+                .spyOn(RustCrypto.prototype, "checkKeyBackupAndEnable")
+                .mockResolvedValue({} as KeyBackupCheck);
+
+            await makeTestRustCrypto();
+
+            expect(spyCheckKeyBackupAndEnable).toHaveBeenCalled();
+        });
+
         it("raises KeyBackupStatus event when identify change", async () => {
+            // Return the key backup
+            fetchMock.get("path:/_matrix/client/v3/room_keys/version", testData.SIGNED_BACKUP_DATA);
+
             const mockHttpApi = new MatrixHttpApi(new TypedEventEmitter<HttpApiEvent, HttpApiEventHandlerMap>(), {
                 baseUrl: "http://server/",
                 prefix: "",
@@ -890,9 +906,6 @@ describe("RustCrypto", () => {
                 {} as CryptoCallbacks,
             );
 
-            // Return the key backup
-            fetchMock.get("path:/_matrix/client/v3/room_keys/version", testData.SIGNED_BACKUP_DATA);
-
             // Wait for the key backup to be available
             const keyBackupStatusPromise = new Promise<boolean>((resolve) =>
                 rustCrypto.once(CryptoEvent.KeyBackupStatus, resolve),

src/rust-crypto/rust-crypto.ts

@@ -153,6 +153,9 @@ export class RustCrypto extends TypedEventEmitter<RustCryptoEvents, RustCryptoEv
         ]);
 
         this.crossSigningIdentity = new CrossSigningIdentity(olmMachine, this.outgoingRequestProcessor, secretStorage);
+
+        // Check and start in background the key backup connection
+        this.checkKeyBackupAndEnable();
     }
 
     /**