108 lines
3.6 KiB
TypeScript
108 lines
3.6 KiB
TypeScript
import { AbstractEncryptService } from "@bitwarden/common/abstractions/abstractEncrypt.service";
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import { AbstractStorageService } from "@bitwarden/common/abstractions/storage.service";
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import { EncString } from "@bitwarden/common/models/domain/encString";
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import { SymmetricCryptoKey } from "@bitwarden/common/models/domain/symmetricCryptoKey";
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import { AbstractKeyGenerationService } from "./abstractions/abstractKeyGeneration.service";
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import BrowserLocalStorageService from "./browserLocalStorage.service";
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import BrowserMemoryStorageService from "./browserMemoryStorage.service";
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const keys = {
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encKey: "localEncryptionKey",
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sessionKey: "session",
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};
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export class LocalBackedSessionStorageService extends AbstractStorageService {
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private cache = new Map<string, any>();
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private localStorage = new BrowserLocalStorageService();
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private sessionStorage = new BrowserMemoryStorageService();
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constructor(
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private encryptService: AbstractEncryptService,
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private keyGenerationService: AbstractKeyGenerationService
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) {
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super();
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}
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async get<T>(key: string): Promise<T> {
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if (this.cache.has(key)) {
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return this.cache.get(key);
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}
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const session = await this.getLocalSession(await this.getSessionEncKey());
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if (session == null || !Object.keys(session).includes(key)) {
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return null;
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}
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this.cache.set(key, session[key]);
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return this.cache.get(key);
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}
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async has(key: string): Promise<boolean> {
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return (await this.get(key)) != null;
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}
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async save(key: string, obj: any): Promise<void> {
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if (obj == null) {
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this.cache.delete(key);
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} else {
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this.cache.set(key, obj);
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}
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const sessionEncKey = await this.getSessionEncKey();
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const localSession = (await this.getLocalSession(sessionEncKey)) ?? {};
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localSession[key] = obj;
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await this.setLocalSession(localSession, sessionEncKey);
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}
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async remove(key: string): Promise<void> {
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await this.save(key, null);
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}
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async getLocalSession(encKey: SymmetricCryptoKey): Promise<any> {
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const local = await this.localStorage.get<string>(keys.sessionKey);
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if (local == null) {
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return null;
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}
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const sessionJson = await this.encryptService.decryptToUtf8(new EncString(local), encKey);
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if (sessionJson == null) {
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// Error with decryption -- session is lost, delete state and key and start over
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await this.setSessionEncKey(null);
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await this.localStorage.remove(keys.sessionKey);
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return null;
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}
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return JSON.parse(sessionJson);
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}
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async setLocalSession(session: any, key: SymmetricCryptoKey) {
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const jsonSession = JSON.stringify(session);
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const encSession = await this.encryptService.encrypt(jsonSession, key);
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if (encSession == null) {
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return await this.localStorage.remove(keys.sessionKey);
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}
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await this.localStorage.save(keys.sessionKey, encSession.encryptedString);
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}
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async getSessionEncKey(): Promise<SymmetricCryptoKey> {
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let storedKey = (await this.sessionStorage.get(keys.encKey)) as SymmetricCryptoKey;
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if (storedKey == null || Object.keys(storedKey).length == 0) {
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storedKey = await this.keyGenerationService.makeEphemeralKey();
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await this.setSessionEncKey(storedKey);
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}
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return SymmetricCryptoKey.initFromJson(
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Object.create(SymmetricCryptoKey.prototype, Object.getOwnPropertyDescriptors(storedKey))
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);
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}
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async setSessionEncKey(input: SymmetricCryptoKey): Promise<void> {
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if (input == null) {
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await this.sessionStorage.remove(keys.encKey);
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} else {
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await this.sessionStorage.save(keys.encKey, input);
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}
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}
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}
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