backup: export getBackupId/getBackupLevel for node

node/Native.d.ts

@@ -153,6 +153,8 @@ export function AuthCredentialPresentation_GetUuidCiphertext(presentationBytes:
 export function AuthCredentialWithPniResponse_CheckValidContents(bytes: Buffer): void;
 export function AuthCredentialWithPni_CheckValidContents(bytes: Buffer): void;
 export function BackupAuthCredentialPresentation_CheckValidContents(presentationBytes: Buffer): void;
+export function BackupAuthCredentialPresentation_GetBackupId(presentationBytes: Buffer): Buffer;
+export function BackupAuthCredentialPresentation_GetBackupLevel(presentationBytes: Buffer): number;
 export function BackupAuthCredentialPresentation_Verify(presentationBytes: Buffer, now: Timestamp, serverParamsBytes: Buffer): void;
 export function BackupAuthCredentialRequestContext_CheckValidContents(contextBytes: Buffer): void;
 export function BackupAuthCredentialRequestContext_GetRequest(contextBytes: Buffer): Buffer;

node/ts/test/ZKGroup-test.ts

@@ -749,6 +749,12 @@ describe('ZKGroup', () => {
       );
       assert.equal(backupLevel, credential.getBackupLevel());
       assertArrayEquals(SERIALIZED_BACKUP_ID, credential.getBackupId());
+
+      const presentation = credential.present(
+        serverSecretParams.getPublicParams()
+      );
+      assert.equal(backupLevel, presentation.getBackupLevel());
+      assertArrayEquals(SERIALIZED_BACKUP_ID, presentation.getBackupId());
     });
 
     it('testIntegration', () => {

node/ts/zkgroup/backups/BackupAuthCredentialPresentation.ts

@@ -7,6 +7,7 @@ import ByteArray from '../internal/ByteArray';
 import * as Native from '../../../Native';
 
 import GenericServerSecretParams from '../GenericServerSecretParams';
+import BackupLevel from './BackupLevel';
 
 export default class BackupAuthCredentialPresentation extends ByteArray {
   private readonly __type?: never;
@@ -25,4 +26,18 @@ export default class BackupAuthCredentialPresentation extends ByteArray {
       serverParams.contents
     );
   }
+
+  getBackupId(): Buffer {
+    return Native.BackupAuthCredentialPresentation_GetBackupId(this.contents);
+  }
+
+  getBackupLevel(): BackupLevel {
+    const n: number = Native.BackupAuthCredentialPresentation_GetBackupLevel(
+      this.contents
+    );
+    if (!(n in BackupLevel)) {
+      throw new TypeError(`Invalid BackupLevel ${n}`);
+    }
+    return n;
+  }
 }

rust/bridge/shared/src/zkgroup.rs

@@ -1024,14 +1024,14 @@ fn BackupAuthCredentialPresentation_Verify(
     presentation.verify(now, &server_params)
 }
 
-#[bridge_fn(ffi = false, node = false)]
+#[bridge_fn(ffi = false)]
 fn BackupAuthCredentialPresentation_GetBackupId(presentation_bytes: &[u8]) -> [u8; 16] {
     let presentation = bincode::deserialize::<BackupAuthCredentialPresentation>(presentation_bytes)
         .expect("should have been parsed previously");
     presentation.backup_id()
 }
 
-#[bridge_fn(ffi = false, node = false)]
+#[bridge_fn(ffi = false)]
 fn BackupAuthCredentialPresentation_GetBackupLevel(presentation_bytes: &[u8]) -> u8 {
     let presentation = bincode::deserialize::<BackupAuthCredentialPresentation>(presentation_bytes)
         .expect("should have been parsed previously");