feat(browser): sign-in session storage

packages/browser/jest.config.js

@@ -2,7 +2,7 @@ module.exports = {
   collectCoverageFrom: ['src/**/*.{js,jsx,ts,tsx}', '!<rootDir>/node_modules/'],
   coverageReporters: ['text-summary', 'lcov'],
   moduleFileExtensions: ['ts', 'js'],
-  setupFilesAfterEnv: ['./jest.setup.js'],
+  setupFilesAfterEnv: ['./jest.setup.js', 'jest-matcher-specific-error'],
   testEnvironment: 'jsdom',
   testPathIgnorePatterns: ['lib'],
   testRegex: '(/__tests__/.*|\\.(test|spec))\\.(ts|js)$',

packages/browser/package.json

@@ -20,15 +20,19 @@
   },
   "dependencies": {
     "@logto/js": "^0.0.1",
-    "@silverhand/essentials": "^1.1.5"
+    "@silverhand/essentials": "^1.1.5",
+    "lodash.get": "^4.4.2",
+    "superstruct": "^0.15.3"
   },
   "devDependencies": {
     "@silverhand/eslint-config": "^0.7.0",
     "@silverhand/ts-config": "^0.7.0",
+    "@types/lodash.get": "^4.4.6",
     "codecov": "^3.8.3",
     "eslint": "^8.8.0",
     "jest": "^27.0.6",
     "jest-location-mock": "^1.0.9",
+    "jest-matcher-specific-error": "^1.0.0",
     "lint-staged": "^12.3.3",
     "prettier": "^2.3.2",
     "text-encoder": "^0.0.4",

packages/browser/src/errors.ts

@@ -0,0 +1,33 @@
+import { NormalizeKeyPaths } from '@silverhand/essentials';
+import get from 'lodash.get';
+
+const logtoClientErrorCodes = Object.freeze({
+  sign_in_session: {
+    not_found: 'Sign-in session not found.',
+  },
+});
+
+export type LogtoClientErrorCode = NormalizeKeyPaths<typeof logtoClientErrorCodes>;
+
+const getMessageByErrorCode = (errorCode: LogtoClientErrorCode): string => {
+  // TODO: linear issue LOG-1419
+  // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+  const message = get(logtoClientErrorCodes, errorCode);
+
+  if (typeof message === 'string') {
+    return message;
+  }
+
+  return errorCode;
+};
+
+export class LogtoClientError extends Error {
+  code: LogtoClientErrorCode;
+  data: unknown;
+
+  constructor(code: LogtoClientErrorCode, data?: unknown) {
+    super(getMessageByErrorCode(code));
+    this.code = code;
+    this.data = data;
+  }
+}

packages/browser/src/index.test.ts

@@ -1,30 +1,95 @@
-import LogtoClient from './index';
+import LogtoClient, { LogtoClientError, LogtoSignInSessionItem } from '.';
 
 const clientId = 'client_id_value';
 const endpoint = 'https://logto.dev';
 const authorizationEndpoint = `${endpoint}/oidc/auth`;
+const mockedCodeVerifier = 'code_verifier_value';
+const mockedState = 'state_value';
+const mockedSignInUri = `${authorizationEndpoint}?foo=bar`;
 const redirectUri = 'http://localhost:3000/callback';
 const requester = jest.fn();
-const signInUri = `${authorizationEndpoint}?foo=bar`;
-
-jest.mock('@logto/js', () => {
-  return {
-    ...jest.requireActual('@logto/js'),
-    fetchOidcConfig: async () => ({ authorizationEndpoint }),
-    generateSignInUri: () => signInUri,
-  };
-});
+
+jest.mock('@logto/js', () => ({
+  ...jest.requireActual('@logto/js'),
+  fetchOidcConfig: async () => ({ authorizationEndpoint }),
+  generateCodeChallenge: jest.fn().mockResolvedValue('code_challenge_value'),
+  generateCodeVerifier: jest.fn(() => mockedCodeVerifier),
+  generateSignInUri: jest.fn(() => mockedSignInUri),
+  generateState: jest.fn(() => mockedState),
+}));
+
+/**
+ * Make LogtoClient.signInSession accessible for test
+ */
+class LogtoClientSignInSessionAccessor extends LogtoClient {
+  public getSignInSessionItem(): LogtoSignInSessionItem {
+    return this.signInSession;
+  }
+
+  public setSignInSessionItem(item: LogtoSignInSessionItem) {
+    this.signInSession = item;
+  }
+}
 
 describe('LogtoClient', () => {
   test('constructor', () => {
     expect(() => new LogtoClient({ endpoint, clientId, requester })).not.toThrow();
   });
 
+  describe('signInSession', () => {
+    test('getter should throw LogtoClientError when signInSession has not been set', () => {
+      const signInSessionAccessor = new LogtoClientSignInSessionAccessor({
+        endpoint,
+        clientId,
+        requester,
+      });
+
+      expect(() => signInSessionAccessor.getSignInSessionItem()).toMatchError(
+        new LogtoClientError('sign_in_session.not_found')
+      );
+    });
+
+    test('getter should throw StructError when signInSession does not contain the required property', () => {
+      const signInSessionAccessor = new LogtoClientSignInSessionAccessor({
+        endpoint,
+        clientId,
+        requester,
+      });
+
+      // @ts-expect-error
+      signInSessionAccessor.setSignInSessionItem({
+        redirectUri,
+        codeVerifier: mockedCodeVerifier,
+      });
+
+      expect(() => signInSessionAccessor.getSignInSessionItem()).toThrow(
+        'At path: state -- Expected a string, but received: undefined'
+      );
+    });
+
+    test('should be able to set and get the correct item', () => {
+      const signInSessionAccessor = new LogtoClientSignInSessionAccessor({
+        endpoint,
+        clientId,
+        requester,
+      });
+
+      const logtoSignInSessionItem: LogtoSignInSessionItem = {
+        redirectUri,
+        codeVerifier: mockedCodeVerifier,
+        state: mockedState,
+      };
+
+      signInSessionAccessor.setSignInSessionItem(logtoSignInSessionItem);
+      expect(signInSessionAccessor.getSignInSessionItem()).toEqual(logtoSignInSessionItem);
+    });
+  });
+
   describe('signIn', () => {
     test('window.location should be correct signInUri', async () => {
       const logtoClient = new LogtoClient({ endpoint, clientId, requester });
       await logtoClient.signIn(redirectUri);
-      expect(window.location.toString()).toEqual(signInUri);
+      expect(window.location.toString()).toEqual(mockedSignInUri);
     });
   });
 });

packages/browser/src/index.ts

@@ -8,6 +8,10 @@ import {
   Requester,
   withReservedScopes,
 } from '@logto/js';
+import { Optional } from '@silverhand/essentials';
+import { create, Infer, string, type } from 'superstruct';
+
+import { LogtoClientError } from './errors';
 
 const discoveryPath = '/oidc/.well-known/openid-configuration';
 const logtoStorageItemKeyPrefix = `logto`;
@@ -29,21 +33,50 @@ export type AccessToken = {
   expiresAt: number; // Unix Timestamp in seconds
 };
 
+export const LogtoSignInSessionItemSchema = type({
+  redirectUri: string(),
+  codeVerifier: string(),
+  state: string(),
+});
+
+export type LogtoSignInSessionItem = Infer<typeof LogtoSignInSessionItemSchema>;
+
 export default class LogtoClient {
   protected accessTokenMap = new Map<string, AccessToken>();
   protected refreshToken?: string;
   protected idToken?: string;
   protected logtoConfig: LogtoConfig;
   protected oidcConfig?: OidcConfigResponse;
+  protected logtoSignInSessionKey: string;
+
+  private readonly _signInSession: Optional<LogtoSignInSessionItem>;
 
   constructor(logtoConfig: LogtoConfig) {
     this.logtoConfig = logtoConfig;
+    this.logtoSignInSessionKey = getLogtoKey(logtoConfig.clientId);
   }
 
   public get isAuthenticated() {
     return Boolean(this.idToken);
   }
 
+  protected get signInSession(): LogtoSignInSessionItem {
+    const jsonItem = sessionStorage.getItem(this.logtoSignInSessionKey);
+
+    if (!jsonItem) {
+      throw new LogtoClientError('sign_in_session.not_found');
+    }
+
+    const item: unknown = JSON.parse(jsonItem);
+
+    return create(item, LogtoSignInSessionItemSchema);
+  }
+
+  protected set signInSession(logtoSignInSessionItem: LogtoSignInSessionItem) {
+    const jsonItem = JSON.stringify(logtoSignInSessionItem);
+    sessionStorage.setItem(this.logtoSignInSessionKey, jsonItem);
+  }
+
   public async signIn(redirectUri: string) {
     const { clientId, resources, scopes: customScopes } = this.logtoConfig;
     const oidcConfig = await this.getOidcConfig();
@@ -64,7 +97,7 @@ export default class LogtoClient {
       resources,
     });
 
-    // TODO: save redirectUri, codeVerifier and state
+    this.signInSession = { redirectUri, codeVerifier, state };
     window.location.assign(signInUri);
   }
 
@@ -77,4 +110,10 @@ export default class LogtoClient {
 
     return this.oidcConfig;
   }
+
+  protected clearSignInSession() {
+    sessionStorage.removeItem(this.logtoSignInSessionKey);
+  }
 }
+
+export * from './errors';

packages/browser/tsconfig.json

@@ -3,6 +3,11 @@
     "compilerOptions": {
         "outDir": "lib",
         "target": "es5",
+        "types": [
+            "node",
+            "jest",
+            "jest-matcher-specific-error"
+        ]
     },
     "include": [
         "src"