Enforce stronger types for ArrayBuffers and storage

ts/textsecure/storage/User.ts

@@ -0,0 +1,76 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { StorageInterface } from '../../types/Storage.d';
+
+import Helpers from '../Helpers';
+
+export class User {
+  constructor(private readonly storage: StorageInterface) {}
+
+  public async setNumberAndDeviceId(
+    number: string,
+    deviceId: number,
+    deviceName?: string
+  ): Promise<void> {
+    await this.storage.put('number_id', `${number}.${deviceId}`);
+    if (deviceName) {
+      await this.storage.put('device_name', deviceName);
+    }
+  }
+
+  public async setUuidAndDeviceId(
+    uuid: string,
+    deviceId: number
+  ): Promise<void> {
+    return this.storage.put('uuid_id', `${uuid}.${deviceId}`);
+  }
+
+  public getNumber(): string | undefined {
+    const numberId = this.storage.get('number_id');
+    if (numberId === undefined) return undefined;
+    return Helpers.unencodeNumber(numberId)[0];
+  }
+
+  public getUuid(): string | undefined {
+    const uuid = this.storage.get('uuid_id');
+    if (uuid === undefined) return undefined;
+    return Helpers.unencodeNumber(uuid.toLowerCase())[0];
+  }
+
+  public getDeviceId(): number | undefined {
+    const value = this._getDeviceIdFromUuid() || this._getDeviceIdFromNumber();
+    if (value === undefined) {
+      return undefined;
+    }
+    return parseInt(value, 10);
+  }
+
+  public getDeviceName(): string | undefined {
+    return this.storage.get('device_name');
+  }
+
+  public async setDeviceNameEncrypted(): Promise<void> {
+    return this.storage.put('deviceNameEncrypted', true);
+  }
+
+  public getDeviceNameEncrypted(): boolean | undefined {
+    return this.storage.get('deviceNameEncrypted');
+  }
+
+  public getSignalingKey(): ArrayBuffer | undefined {
+    return this.storage.get('signaling_key');
+  }
+
+  private _getDeviceIdFromUuid(): string | undefined {
+    const uuid = this.storage.get('uuid_id');
+    if (uuid === undefined) return undefined;
+    return Helpers.unencodeNumber(uuid)[1];
+  }
+
+  private _getDeviceIdFromNumber(): string | undefined {
+    const numberId = this.storage.get('number_id');
+    if (numberId === undefined) return undefined;
+    return Helpers.unencodeNumber(numberId)[1];
+  }
+}