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📝 docs(auth): document Better Auth typing improvements

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Add comprehensive documentation for Better Auth improvements:
- Centralized types package usage guide
- Frontend type inference examples
- Zod validation implementation
- Rate limiting configuration
- Integration test documentation
- Migration guide for developers

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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32
services/mana-core-auth/CLAUDE.md
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@ -117,8 +117,10 @@ Key points:
| ------------------------------------------ | ------------------------------------------------ |
| `src/auth/better-auth.config.ts` | Better Auth configuration with JWT + Org plugins |
| `src/auth/services/better-auth.service.ts` | Main auth service - ALL auth logic here |
| `src/auth/types/better-auth.types.ts` | Type definitions (inferred + manual) |
| `src/db/schema/auth.schema.ts` | User, session, account, jwks tables |
| `docs/AUTHENTICATION_ARCHITECTURE.md` | Comprehensive auth documentation |
| `docs/BETTER_AUTH_TYPING_IMPROVEMENTS.md` | TypeScript typing decisions and limitations |
## Environment Variables
@ -157,6 +159,36 @@ Other services call `POST /api/v1/auth/validate` with the JWT. The validation us
For dynamic data (credits, org info), create API endpoints instead.
### Better Auth TypeScript Types
**READ FIRST:** `docs/BETTER_AUTH_TYPING_IMPROVEMENTS.md`
**Prefer inferred types:**
```typescript
import type { AuthUser, AuthSession } from '../better-auth.config';
```
**Known limitation:** `$Infer` doesn't expose plugin API methods. The manual `BetterAuthAPI` interface is required:
```typescript
// This is necessary - Better Auth's $Infer doesn't work for API methods
private get api(): BetterAuthAPI {
return this.auth.api as unknown as BetterAuthAPI;
}
```
**Adding user fields:**
```typescript
// In better-auth.config.ts
user: {
additionalFields: {
myField: {
type: 'string',
input: false, // SECURITY: prevents client from setting
},
},
},
```
## Debugging
### Token not validating?

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services/mana-core-auth/docs/BETTER_AUTH_TYPING_IMPROVEMENTS.md Normal file
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@ -0,0 +1,803 @@
# Better Auth Typing Improvements
**Date:** December 2024
**Status:** Implemented
**Version:** 2.0
---
## Table of Contents
1. [Executive Summary](#executive-summary)
2. [Centralized Types Package](#centralized-types-package)
3. [Frontend Type Inference](#frontend-type-inference)
4. [Zod Validation for Role Enum](#zod-validation-for-role-enum)
5. [Rate Limiting on Sensitive Endpoints](#rate-limiting-on-sensitive-endpoints)
6. [Package Migrations](#package-migrations)
7. [Integration Tests](#integration-tests)
8. [Test Infrastructure](#test-infrastructure)
9. [Known Limitations](#known-limitations)
10. [Migration Guide](#migration-guide)
11. [References](#references)
---
## Executive Summary
This document describes the Better Auth typing improvements implemented in December 2024. The changes establish a robust, type-safe authentication system with:
| Improvement | Description |
|-------------|-------------|
| **Centralized Types** | Single source of truth via `@manacore/better-auth-types` |
| **Frontend Inference** | `userAdditionalFields` export for Better Auth client plugins |
| **Runtime Validation** | Zod schema validates role enum server-side |
| **Rate Limiting** | `@Throttle` decorators protect sensitive auth endpoints |
| **Integration Tests** | 8 comprehensive tests for role security |
| **ESM Compatibility** | `jose` mock for Jest in ESM environment |
### Key Files Modified
| File | Purpose |
|------|---------|
| `packages/better-auth-types/src/index.ts` | Centralized type definitions |
| `services/mana-core-auth/src/auth/better-auth.config.ts` | Zod validation, role field config |
| `services/mana-core-auth/src/auth/auth.controller.ts` | Rate limiting decorators |
| `packages/shared-auth/src/better-auth-fields.ts` | Frontend type inference exports |
| `packages/shared-nestjs-auth/src/types/index.ts` | NestJS guard types |
| `services/mana-core-auth/test/__mocks__/jose.ts` | ESM-compatible JWT mock |
| `services/mana-core-auth/test/integration/role-security.e2e-spec.ts` | Role security tests |
---
## Centralized Types Package
### Overview
A new package `@manacore/better-auth-types` provides all shared Better Auth types for the monorepo. This eliminates type duplication and ensures consistency across all services.
**Package Location:** `packages/better-auth-types/`
### Package Structure
```
packages/better-auth-types/
├── src/
│ └── index.ts # All type exports
├── dist/ # Built output
├── package.json
└── tsconfig.json
```
### Available Types
#### User Role Types
```typescript
import type { UserRole } from '@manacore/better-auth-types';
import { isValidUserRole } from '@manacore/better-auth-types';
// UserRole = 'user' | 'admin' | 'service'
const role: UserRole = 'admin';
// Runtime validation
if (isValidUserRole(unknownValue)) {
// unknownValue is now typed as UserRole
}
```
#### JWT Payload Types
```typescript
import type { JWTPayload, StrictJWTPayload } from '@manacore/better-auth-types';
// JWTPayload - role as string (flexible)
interface JWTPayload {
sub: string;
email: string;
role: string; // Any string
sid: string;
exp?: number;
iat?: number;
iss?: string;
aud?: string;
}
// StrictJWTPayload - role as UserRole (strict)
interface StrictJWTPayload {
sub: string;
email: string;
role: UserRole; // 'user' | 'admin' | 'service'
sid: string;
// ...
}
```
#### NestJS Guard Types
```typescript
import type { CurrentUserData, StrictCurrentUserData } from '@manacore/better-auth-types';
import { jwtPayloadToCurrentUser, jwtPayloadToStrictCurrentUser } from '@manacore/better-auth-types';
// Use in controller
@Get('profile')
@UseGuards(JwtAuthGuard)
getProfile(@CurrentUser() user: CurrentUserData) {
return { userId: user.userId, email: user.email, role: user.role };
}
```
#### Utility Functions
```typescript
import {
isValidUserRole,
isValidOrganizationRole,
jwtPayloadToCurrentUser,
jwtPayloadToStrictCurrentUser,
} from '@manacore/better-auth-types';
// Convert JWT payload to current user data
const currentUser = jwtPayloadToCurrentUser(payload);
// Strict conversion (returns null if role invalid)
const strictUser = jwtPayloadToStrictCurrentUser(payload);
if (strictUser === null) {
throw new Error('Invalid role in JWT');
}
```
### Full Type Export List
| Type/Function | Purpose |
|---------------|---------|
| `UserRole` | `'user' \| 'admin' \| 'service'` |
| `OrganizationRole` | `'owner' \| 'admin' \| 'member'` |
| `InvitationStatus` | `'pending' \| 'accepted' \| 'rejected' \| 'expired'` |
| `JWTPayload` | Standard JWT payload interface |
| `StrictJWTPayload` | JWT payload with strict UserRole |
| `UserData` | User data for client apps |
| `StrictUserData` | User data with strict UserRole |
| `CurrentUserData` | NestJS guard user data |
| `StrictCurrentUserData` | NestJS guard user data with strict UserRole |
| `AuthResult` | Auth operation result |
| `TokenRefreshResult` | Token refresh operation result |
| `TokenValidationResponse` | Token validation response |
| `Organization` | Organization data structure |
| `OrganizationMember` | Organization member data |
| `OrganizationInvitation` | Invitation data |
| `CreditBalance` | Credit balance info |
| `B2BInfo` | B2B information from JWT |
| `userAdditionalFields` | Client type inference config |
| `isValidUserRole()` | Runtime role validation |
| `isValidOrganizationRole()` | Runtime org role validation |
| `jwtPayloadToCurrentUser()` | Convert JWT to CurrentUserData |
| `jwtPayloadToStrictCurrentUser()` | Convert JWT to StrictCurrentUserData |
---
## Frontend Type Inference
### Overview
Better Auth's `inferAdditionalFields` plugin allows frontend clients to have proper TypeScript inference for custom user fields like `role`. The `userAdditionalFields` export provides the configuration for this.
### Location
**Primary:** `packages/better-auth-types/src/index.ts`
**Re-export:** `packages/shared-auth/src/better-auth-fields.ts`
### Usage in Frontend Apps
#### SvelteKit Example
```typescript
// src/lib/auth.ts
import { createAuthClient } from "better-auth/client";
import { inferAdditionalFields } from "better-auth/client/plugins";
import { userAdditionalFields } from "@manacore/shared-auth";
export const authClient = createAuthClient({
baseURL: "http://localhost:3001",
plugins: [inferAdditionalFields(userAdditionalFields)],
});
// Now user.role is properly typed!
const session = await authClient.getSession();
if (session?.user) {
console.log(session.user.role); // TypeScript knows this is string
}
```
#### React/React Native Example
```typescript
// src/auth/client.ts
import { createAuthClient } from "better-auth/client";
import { inferAdditionalFields } from "better-auth/client/plugins";
import { userAdditionalFields } from "@manacore/shared-auth";
export const auth = createAuthClient({
baseURL: process.env.EXPO_PUBLIC_AUTH_URL,
plugins: [inferAdditionalFields(userAdditionalFields)],
});
```
### Field Definition Structure
The `userAdditionalFields` object must match the server-side configuration:
```typescript
// packages/better-auth-types/src/index.ts
export const userAdditionalFields = {
user: {
role: {
type: 'string' as const,
},
},
} as const;
```
**IMPORTANT:** Keep this in sync with the server config in `services/mana-core-auth/src/auth/better-auth.config.ts`.
---
## Zod Validation for Role Enum
### Overview
Runtime validation ensures only valid role values can be assigned to users. This provides defense-in-depth alongside `input: false`.
### Location
**File:** `services/mana-core-auth/src/auth/better-auth.config.ts` (lines 27-51)
### Implementation
```typescript
import { z } from 'zod';
/**
* User role schema with Zod runtime validation
*/
export const userRoleSchema = z.enum(['user', 'admin', 'service'], {
errorMap: () => ({ message: 'Invalid user role. Must be one of: user, admin, service' }),
});
/**
* Inferred TypeScript type from Zod schema
*/
export type UserRole = z.infer<typeof userRoleSchema>;
/**
* Type guard using Zod
*/
export function isValidUserRole(role: unknown): role is UserRole {
return userRoleSchema.safeParse(role).success;
}
```
### Better Auth Integration
The Zod schema is used in the `user.additionalFields` configuration:
```typescript
// services/mana-core-auth/src/auth/better-auth.config.ts
user: {
additionalFields: {
role: {
type: 'string',
required: false,
defaultValue: 'user',
input: false, // Security: clients cannot set role
validator: {
input: userRoleSchema, // Runtime validation with Zod
},
},
},
},
```
### Security Layers
| Layer | Protection |
|-------|------------|
| `input: false` | Prevents clients from setting role during registration |
| `defaultValue: 'user'` | New users always start with 'user' role |
| `validator.input` | Rejects invalid role values server-side |
| Database constraint | PostgreSQL enum ensures data integrity |
---
## Rate Limiting on Sensitive Endpoints
### Overview
Rate limiting protects against brute force attacks, credential stuffing, and enumeration attacks on authentication endpoints.
### Location
**File:** `services/mana-core-auth/src/auth/auth.controller.ts` (lines 26-44)
### Rate Limit Configuration
```typescript
const RATE_LIMITS = {
/** 5 login attempts per 60 seconds */
LOGIN: { limit: 5, ttl: 60000 },
/** 10 registrations per hour */
REGISTER: { limit: 10, ttl: 3600000 },
/** 3 password reset requests per 5 minutes */
PASSWORD_RESET: { limit: 3, ttl: 300000 },
/** 5 B2B registrations per hour */
B2B_REGISTER: { limit: 5, ttl: 3600000 },
} as const;
```
### Endpoint Rate Limits
| Endpoint | Limit | TTL | Purpose |
|----------|-------|-----|---------|
| `POST /auth/login` | 5/min | 60s | Brute force protection |
| `POST /auth/register` | 10/hr | 1hr | Spam prevention |
| `POST /auth/forgot-password` | 3/5min | 5min | Email enumeration protection |
| `POST /auth/register/b2b` | 5/hr | 1hr | B2B spam prevention |
| `POST /auth/validate` | No limit | - | High-frequency internal operation |
| `GET /auth/jwks` | No limit | - | Cacheable public keys |
### Usage in Controller
```typescript
import { Throttle, SkipThrottle } from '@nestjs/throttler';
@Controller('auth')
export class AuthController {
/**
* Rate limit: 5 attempts per minute per IP
*/
@Post('login')
@Throttle({ default: RATE_LIMITS.LOGIN })
@HttpCode(HttpStatus.OK)
async login(@Body() loginDto: LoginDto) {
return this.betterAuthService.signIn(loginDto);
}
/**
* Skip rate limiting for high-frequency internal operations
*/
@Post('validate')
@SkipThrottle()
@HttpCode(HttpStatus.OK)
async validate(@Body() body: { token: string }) {
return this.betterAuthService.validateToken(body.token);
}
}
```
### Rate Limit Response
When rate limit is exceeded, the API returns:
```json
{
"statusCode": 429,
"message": "ThrottlerException: Too Many Requests"
}
```
---
## Package Migrations
### @manacore/shared-auth
**Purpose:** Client-side auth utilities for web/mobile apps
**Migration:** Now re-exports types from `@manacore/better-auth-types`
**File:** `packages/shared-auth/src/better-auth-fields.ts`
```typescript
// Re-export from centralized package
export {
userAdditionalFields,
type UserRole,
type OrganizationRole,
type UserWithAdditionalFields,
isValidUserRole,
isValidOrganizationRole,
} from '@manacore/better-auth-types';
```
**File:** `packages/shared-auth/src/index.ts`
```typescript
// Better Auth field definitions for client type inference
export {
userAdditionalFields,
type UserRole,
type OrganizationRole,
type UserWithAdditionalFields,
isValidUserRole,
isValidOrganizationRole,
} from './better-auth-fields';
```
### @manacore/shared-nestjs-auth
**Purpose:** NestJS guards and decorators for JWT validation
**Migration:** Now uses `@manacore/better-auth-types` as a dependency
**File:** `packages/shared-nestjs-auth/package.json`
```json
{
"dependencies": {
"@manacore/better-auth-types": "workspace:*"
}
}
```
**File:** `packages/shared-nestjs-auth/src/types/index.ts`
```typescript
// Re-export centralized types
export type {
CurrentUserData,
StrictCurrentUserData,
JWTPayload,
StrictJWTPayload,
UserRole,
OrganizationRole,
TokenValidationResponse,
} from '@manacore/better-auth-types';
export {
isValidUserRole,
isValidOrganizationRole,
jwtPayloadToCurrentUser,
jwtPayloadToStrictCurrentUser,
} from '@manacore/better-auth-types';
```
---
## Integration Tests
### Overview
Comprehensive integration tests verify the security of the role field implementation.
### Location
**File:** `services/mana-core-auth/test/integration/role-security.e2e-spec.ts`
### Test Categories
#### 1. Role Field Security (`input: false`)
| Test | Description |
|------|-------------|
| Default role assignment | New users get `'user'` role |
| Input security | Role field in registration body is ignored |
| JWT payload role | JWT contains correct role after login |
#### 2. Role Validation
| Test | Description |
|------|-------------|
| Valid enum values | Role is one of `['user', 'admin', 'service']` |
| Token refresh preservation | Role persists across token refresh (skipped in mock env) |
#### 3. Session and Role Consistency
| Test | Description |
|------|-------------|
| Multiple sessions | Same user has same role across sessions |
| JWT claims completeness | JWT contains `sub`, `email`, `role`, `sid` |
#### 4. JWT Payload Minimalism
| Test | Description |
|------|-------------|
| No sensitive data | JWT does not contain `password`, `creditBalance`, etc. |
### Running Tests
```bash
# From mana-core-auth directory
pnpm test:e2e
# Run specific test file
pnpm test:e2e -- --testPathPattern=role-security
```
### Sample Test
```typescript
it('should ignore role field in registration body (input: false security)', async () => {
const uniqueEmail = `role-escalation-attempt-${Date.now()}@example.com`;
// Attempt to register with admin role (should be ignored)
await betterAuthService.registerB2C({
email: uniqueEmail,
password: 'SecurePassword123!',
name: 'Escalation Attempt User',
// Note: If someone tries to add role: 'admin' to the request body,
// Better Auth's input: false should ignore it
});
// Login to verify the role
const loginResult = await betterAuthService.signIn({
email: uniqueEmail,
password: 'SecurePassword123!',
});
// Role should always be 'user' (the default), not 'admin'
expect(loginResult.user.role).toBe('user');
});
```
---
## Test Infrastructure
### Jose Mock for ESM Compatibility
Jest has issues with ESM modules like `jose`. A mock implementation provides test compatibility.
### Location
**File:** `services/mana-core-auth/test/__mocks__/jose.ts`
### Mock Implementation
```typescript
// Mock JWT payload interface
export interface JWTPayload {
sub?: string;
email?: string;
role?: string;
sessionId?: string;
sid?: string;
iat?: number;
exp?: number;
iss?: string;
aud?: string | string[];
[key: string]: unknown;
}
// Mock jwtVerify function
export const jwtVerify = jest.fn(
async (token: string, _keySet: MockKeySet, _options?: unknown): Promise<JWTVerifyResult> => {
// For tests, decode the token if it's a valid JWT format
try {
const parts = token.split('.');
if (parts.length === 3) {
const payload = JSON.parse(Buffer.from(parts[1], 'base64url').toString());
return {
payload,
protectedHeader: { alg: 'EdDSA', typ: 'JWT' },
};
}
} catch {
// If decoding fails, return mock data
}
// Return mock payload for invalid/test tokens
return {
payload: {
sub: 'test-user-id',
email: 'test@example.com',
role: 'user',
sessionId: 'test-session-id',
sid: 'test-session-id',
iat: Math.floor(Date.now() / 1000),
exp: Math.floor(Date.now() / 1000) + 3600,
iss: 'manacore',
aud: 'manacore',
},
protectedHeader: { alg: 'EdDSA', typ: 'JWT' },
};
}
);
// Mock createRemoteJWKSet function
export const createRemoteJWKSet = jest.fn((url: URL) => {
return new MockKeySet(url);
});
// Mock error classes
export class JOSEError extends Error { /* ... */ }
export class JWTExpired extends JOSEError { /* ... */ }
export class JWTInvalid extends JOSEError { /* ... */ }
export const errors = { JOSEError, JWTExpired, JWTInvalid };
```
### Jest Configuration
Add to Jest config to use the mock:
```javascript
// jest.config.js
module.exports = {
moduleNameMapper: {
'^jose$': '<rootDir>/test/__mocks__/jose.ts',
},
};
```
---
## Known Limitations
### 1. Better Auth $Infer for API Methods
Better Auth's `$Infer` pattern does not expose plugin API methods. The inferred `AuthAPI` type is incomplete.
**Impact:** Manual `BetterAuthAPI` interface is still required in `better-auth.types.ts`.
**Workaround:**
```typescript
// Must cast to manual interface
private get api(): BetterAuthAPI {
return this.auth.api as unknown as BetterAuthAPI;
}
```
### 2. Client Type Inference vs Server Config
The `userAdditionalFields` export must be kept in sync with the server configuration manually.
**Mitigation:** Documentation and code comments reference the server config file.
### 3. Token Refresh Test in Mock Environment
The token refresh test is skipped because it requires a real database connection.
```typescript
it.skip('should preserve role across token refresh', async () => {
// Requires real database for session validation
});
```
### 4. Email Service Not Implemented
Password reset sends to console log, not actual email.
```typescript
sendResetPassword: async ({ user, url, token }) => {
console.log('[Password Reset] User:', user.email);
console.log('[Password Reset] Reset URL:', url);
// TODO: Implement email service
};
```
---
## Migration Guide
### For Backend Developers
1. **Update imports to use centralized types:**
```typescript
// Before
import { JWTPayload } from '../types/jwt.types';
// After
import type { JWTPayload, CurrentUserData } from '@manacore/better-auth-types';
```
2. **Use type guards for runtime validation:**
```typescript
import { isValidUserRole } from '@manacore/better-auth-types';
if (!isValidUserRole(payload.role)) {
throw new UnauthorizedException('Invalid role');
}
```
### For Frontend Developers
1. **Add type inference to auth client:**
```typescript
import { createAuthClient } from "better-auth/client";
import { inferAdditionalFields } from "better-auth/client/plugins";
import { userAdditionalFields } from "@manacore/shared-auth";
export const authClient = createAuthClient({
baseURL: "http://localhost:3001",
plugins: [inferAdditionalFields(userAdditionalFields)],
});
```
2. **Access typed user fields:**
```typescript
const session = await authClient.getSession();
if (session?.user) {
const role = session.user.role; // TypeScript knows this is string
}
```
### For Test Writers
1. **Use the jose mock for JWT tests:**
```typescript
// Jest automatically uses the mock from test/__mocks__/jose.ts
import { jwtVerify } from 'jose';
// The mock returns predictable test data
const result = await jwtVerify(token, jwks);
expect(result.payload.role).toBe('user');
```
2. **Write integration tests for role security:**
```typescript
it('should prevent role escalation', async () => {
// Register user (role cannot be set via API)
await betterAuthService.registerB2C({ email, password, name });
// Login and verify role is 'user'
const result = await betterAuthService.signIn({ email, password });
expect(result.user.role).toBe('user');
});
```
---
## References
### Official Documentation
- [Better Auth TypeScript Guide](https://www.better-auth.com/docs/concepts/typescript)
- [Better Auth Database Guide](https://www.better-auth.com/docs/concepts/database)
- [Better Auth JWT Plugin](https://www.better-auth.com/docs/plugins/jwt)
- [NestJS Throttler](https://docs.nestjs.com/security/rate-limiting)
- [Zod Documentation](https://zod.dev/)
### Internal Files
| File | Purpose |
|------|---------|
| `packages/better-auth-types/src/index.ts` | Centralized type definitions |
| `services/mana-core-auth/src/auth/better-auth.config.ts` | Server-side auth configuration |
| `services/mana-core-auth/src/auth/auth.controller.ts` | Auth endpoints with rate limiting |
| `services/mana-core-auth/src/auth/types/better-auth.types.ts` | Legacy types (deprecated) |
| `packages/shared-auth/src/better-auth-fields.ts` | Client type inference exports |
| `packages/shared-nestjs-auth/src/types/index.ts` | NestJS guard types |
| `services/mana-core-auth/test/__mocks__/jose.ts` | JWT mock for tests |
| `services/mana-core-auth/test/integration/role-security.e2e-spec.ts` | Role security tests |
### GitHub Issues (Better Auth)
- [#3780 - Type issue with auth.api.getSession](https://github.com/better-auth/better-auth/issues/3780)
- [#4875 - $Infer.Session doesn't respect customSession](https://github.com/better-auth/better-auth/issues/4875)
- [#5159 - Plugin fields not in TypeScript types](https://github.com/better-auth/better-auth/issues/5159)
---
## Appendix: File Changes Summary
| File | Changes |
|------|---------|
| `packages/better-auth-types/src/index.ts` | New file - all centralized types |
| `packages/better-auth-types/package.json` | New package configuration |
| `services/mana-core-auth/src/auth/better-auth.config.ts` | Added Zod validation, role field config |
| `services/mana-core-auth/src/auth/auth.controller.ts` | Added rate limiting decorators |
| `packages/shared-auth/src/better-auth-fields.ts` | Re-exports from centralized package |
| `packages/shared-auth/src/index.ts` | Updated exports |
| `packages/shared-nestjs-auth/src/types/index.ts` | Re-exports from centralized package |
| `packages/shared-nestjs-auth/package.json` | Added dependency |
| `services/mana-core-auth/test/__mocks__/jose.ts` | New mock for ESM compatibility |
| `services/mana-core-auth/test/integration/role-security.e2e-spec.ts` | New integration tests |
**Breaking Changes:** None (backward compatible)
**Type Safety:** Significantly improved with centralized types and runtime validation