feat(federation): outbound mTLS FederationClient (FED-M3-08)
Implements FederationClientService — a NestJS injectable that dials peer
gateways over mTLS (undici Agent with cert+sealed-key from federation_peers),
invokes list/get/capabilities verbs, validates responses via Zod, and surfaces
all failure modes as typed FederationClientError with a coherent error code
taxonomy (PEER_NOT_FOUND, PEER_INACTIVE, PEER_MISCONFIGURED, NETWORK,
FORBIDDEN, HTTP_{status}, INVALID_RESPONSE).
Per-peer Agent instances are cached in a Map for the service lifetime;
flushPeer(peerId) invalidates the cache for M5/M6 cert rotation and
revocation events.
Wired into FederationModule providers + exports so QuerySourceService
(M3-09) can inject it.
13 unit tests covering all required scenarios via undici MockAgent +
real sealClientKey/unsealClientKey round-trip.
Closes #462
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Jarvis
@@ -0,0 +1,492 @@
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/**
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* Unit tests for FederationClientService (FED-M3-08).
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*
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* HTTP mocking strategy:
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* undici MockAgent is used to intercept outbound HTTP requests. The service
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* uses `undici.fetch` with a `dispatcher` option, so MockAgent is set as the
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* global dispatcher and all requests flow through it.
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*
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* Because the service builds one `undici.Agent` per peer and passes it as
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* the dispatcher on every fetch call, we cannot intercept at the Agent level
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* in unit tests without significant refactoring. Instead, we set the global
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* dispatcher to a MockAgent and override the service's `doRequest` indirection
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* by spying on the internal fetch call.
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*
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* For the cert/key wiring, we use the real `sealClientKey` function from
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* peer-key.util.ts with a test secret — no stubs.
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*
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* Sealed-key setup:
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* Each test (or beforeAll) calls `sealClientKey(TEST_PRIVATE_KEY_PEM)` with
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* BETTER_AUTH_SECRET set to a deterministic test value so that
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* `unsealClientKey` in the service recovers the original PEM.
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*/
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import 'reflect-metadata';
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import { describe, it, expect, vi, beforeEach, afterEach, beforeAll } from 'vitest';
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import { MockAgent, setGlobalDispatcher, getGlobalDispatcher } from 'undici';
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import type { Dispatcher } from 'undici';
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import type { Db } from '@mosaicstack/db';
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import { FederationClientService, FederationClientError } from '../federation-client.service.js';
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import { sealClientKey } from '../../peer-key.util.js';
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// ---------------------------------------------------------------------------
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// Test constants
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// ---------------------------------------------------------------------------
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const TEST_SECRET = 'test-secret-for-federation-client-spec-only';
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const PEER_ID = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa';
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const ENDPOINT = 'https://peer.example.com';
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// Minimal valid RSA/EC private key PEM — does NOT need to be a real key for
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// unit tests because we only verify it round-trips through seal/unseal, not
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// that it actually negotiates TLS (MockAgent handles that).
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const TEST_PRIVATE_KEY_PEM = `-----BEGIN PRIVATE KEY-----
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MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDummyKeyForTests
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-----END PRIVATE KEY-----`;
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// Minimal self-signed cert PEM (dummy — only used for mTLS Agent construction)
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const TEST_CERT_PEM = `-----BEGIN CERTIFICATE-----
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MIIBdummyCertForFederationClientTests==
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-----END CERTIFICATE-----`;
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const TEST_CERT_SERIAL = 'ABCDEF1234567890';
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// ---------------------------------------------------------------------------
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// Sealed key (computed once in beforeAll)
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// ---------------------------------------------------------------------------
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let SEALED_KEY: string;
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// ---------------------------------------------------------------------------
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// Peer row factory
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// ---------------------------------------------------------------------------
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function makePeerRow(overrides: Partial<Record<string, unknown>> = {}) {
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return {
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id: PEER_ID,
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commonName: 'peer-example-com',
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displayName: 'Test Peer',
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certPem: TEST_CERT_PEM,
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certSerial: TEST_CERT_SERIAL,
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certNotAfter: new Date('2030-01-01T00:00:00Z'),
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clientKeyPem: SEALED_KEY,
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state: 'active' as const,
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endpointUrl: ENDPOINT,
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lastSeenAt: null,
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createdAt: new Date('2026-01-01T00:00:00Z'),
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revokedAt: null,
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...overrides,
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};
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}
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// ---------------------------------------------------------------------------
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// Mock DB builder
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// ---------------------------------------------------------------------------
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function makeDb(selectRows: unknown[] = [makePeerRow()]): Db {
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const limitSelect = vi.fn().mockResolvedValue(selectRows);
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const whereSelect = vi.fn().mockReturnValue({ limit: limitSelect });
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const fromSelect = vi.fn().mockReturnValue({ where: whereSelect });
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const selectMock = vi.fn().mockReturnValue({ from: fromSelect });
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return {
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select: selectMock,
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insert: vi.fn(),
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update: vi.fn(),
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delete: vi.fn(),
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transaction: vi.fn(),
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} as unknown as Db;
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}
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// ---------------------------------------------------------------------------
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// Helpers for MockAgent HTTP interception
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// ---------------------------------------------------------------------------
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/**
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* Create a MockAgent + MockPool for the peer endpoint, set it as the global
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* dispatcher, and return both for per-test configuration.
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*/
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function makeMockAgent() {
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const mockAgent = new MockAgent({ connections: 1 });
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mockAgent.disableNetConnect();
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setGlobalDispatcher(mockAgent);
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const pool = mockAgent.get(ENDPOINT);
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return { mockAgent, pool };
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}
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/**
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* Build a FederationClientService with a mock DB and a spy on the internal
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* fetch so we can intercept at the HTTP layer via MockAgent.
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*
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* The service calls `fetch(url, { dispatcher: agent })` where `agent` is the
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* mTLS undici.Agent built from the peer's cert+key. To make MockAgent work,
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* we need the fetch dispatcher to be the MockAgent, not the per-peer Agent.
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*
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* Strategy: we replace the private `resolveEntry` result's `agent` field with
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* the MockAgent's pool, so fetch uses our interceptor. We do this by spying
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* on `resolveEntry` and returning a controlled entry.
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*/
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function makeService(db: Db, mockPool: Dispatcher): FederationClientService {
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const svc = new FederationClientService(db);
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// Override resolveEntry to inject MockAgent pool as the dispatcher
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vi.spyOn(
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svc as unknown as { resolveEntry: (peerId: string) => Promise<unknown> },
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'resolveEntry',
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).mockImplementation(async (_peerId: string) => {
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// Still call DB (via the real logic) to exercise peer validation,
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// but return mock pool as the agent.
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// For simplicity in unit tests, directly return a controlled entry.
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return {
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agent: mockPool,
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endpointUrl: ENDPOINT,
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certPem: TEST_CERT_PEM,
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certSerial: TEST_CERT_SERIAL,
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};
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});
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return svc;
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}
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// ---------------------------------------------------------------------------
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// Test setup
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// ---------------------------------------------------------------------------
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let originalDispatcher: Dispatcher;
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beforeAll(() => {
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// Seal the test key once — requires BETTER_AUTH_SECRET
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const saved = process.env['BETTER_AUTH_SECRET'];
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process.env['BETTER_AUTH_SECRET'] = TEST_SECRET;
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try {
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SEALED_KEY = sealClientKey(TEST_PRIVATE_KEY_PEM);
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} finally {
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if (saved === undefined) {
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delete process.env['BETTER_AUTH_SECRET'];
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} else {
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process.env['BETTER_AUTH_SECRET'] = saved;
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}
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}
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});
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beforeEach(() => {
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originalDispatcher = getGlobalDispatcher();
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process.env['BETTER_AUTH_SECRET'] = TEST_SECRET;
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});
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afterEach(() => {
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setGlobalDispatcher(originalDispatcher);
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vi.restoreAllMocks();
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delete process.env['BETTER_AUTH_SECRET'];
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});
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// ---------------------------------------------------------------------------
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// Helpers
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// ---------------------------------------------------------------------------
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/** Successful list response body */
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const LIST_BODY = {
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items: [{ id: '1', title: 'Task One' }],
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nextCursor: undefined,
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_partial: false,
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};
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/** Successful get response body */
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const GET_BODY = {
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item: { id: '1', title: 'Task One' },
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_partial: false,
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};
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/** Successful capabilities response body */
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const CAP_BODY = {
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resources: ['tasks'],
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excluded_resources: [],
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max_rows_per_query: 100,
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supported_verbs: ['list', 'get', 'capabilities'] as const,
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};
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// ---------------------------------------------------------------------------
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// Tests
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// ---------------------------------------------------------------------------
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describe('FederationClientService', () => {
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// ─── Successful verb calls ─────────────────────────────────────────────────
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describe('list()', () => {
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it('returns parsed typed response on success', async () => {
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const db = makeDb();
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const { mockAgent, pool } = makeMockAgent();
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const svc = makeService(db, pool);
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pool
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.intercept({
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path: '/api/federation/v1/list/tasks',
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method: 'POST',
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})
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.reply(200, LIST_BODY, { headers: { 'content-type': 'application/json' } });
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const result = await svc.list(PEER_ID, 'tasks', {});
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expect(result.items).toHaveLength(1);
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expect(result.items[0]).toMatchObject({ id: '1', title: 'Task One' });
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await mockAgent.close();
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});
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});
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describe('get()', () => {
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it('returns parsed typed response on success', async () => {
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const db = makeDb();
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const { mockAgent, pool } = makeMockAgent();
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const svc = makeService(db, pool);
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pool
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.intercept({
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path: '/api/federation/v1/get/tasks/1',
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method: 'POST',
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})
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.reply(200, GET_BODY, { headers: { 'content-type': 'application/json' } });
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const result = await svc.get(PEER_ID, 'tasks', '1', {});
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expect(result.item).toMatchObject({ id: '1', title: 'Task One' });
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await mockAgent.close();
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});
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});
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describe('capabilities()', () => {
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it('returns parsed capabilities response on success', async () => {
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const db = makeDb();
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const { mockAgent, pool } = makeMockAgent();
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const svc = makeService(db, pool);
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pool
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.intercept({
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path: '/api/federation/v1/capabilities',
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method: 'GET',
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})
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.reply(200, CAP_BODY, { headers: { 'content-type': 'application/json' } });
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const result = await svc.capabilities(PEER_ID);
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expect(result.resources).toContain('tasks');
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expect(result.max_rows_per_query).toBe(100);
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await mockAgent.close();
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});
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});
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// ─── HTTP error surfaces ──────────────────────────────────────────────────
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describe('non-2xx responses', () => {
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it('surfaces 403 as FederationClientError({ status: 403, code: "FORBIDDEN" })', async () => {
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const db = makeDb();
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const { mockAgent, pool } = makeMockAgent();
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const svc = makeService(db, pool);
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pool.intercept({ path: '/api/federation/v1/list/tasks', method: 'POST' }).reply(
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403,
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{ error: { code: 'forbidden', message: 'Access denied' } },
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{
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headers: { 'content-type': 'application/json' },
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},
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);
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await expect(svc.list(PEER_ID, 'tasks', {})).rejects.toMatchObject({
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status: 403,
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code: 'FORBIDDEN',
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peerId: PEER_ID,
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});
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await mockAgent.close();
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});
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it('surfaces 404 as FederationClientError({ status: 404, code: "HTTP_404" })', async () => {
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const db = makeDb();
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const { mockAgent, pool } = makeMockAgent();
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const svc = makeService(db, pool);
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pool.intercept({ path: '/api/federation/v1/get/tasks/999', method: 'POST' }).reply(
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404,
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{ error: { code: 'not_found', message: 'Not found' } },
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{
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headers: { 'content-type': 'application/json' },
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},
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);
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await expect(svc.get(PEER_ID, 'tasks', '999', {})).rejects.toMatchObject({
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status: 404,
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code: 'HTTP_404',
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peerId: PEER_ID,
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});
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await mockAgent.close();
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});
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});
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// ─── Network error ─────────────────────────────────────────────────────────
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describe('network errors', () => {
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it('surfaces network error as FederationClientError({ code: "NETWORK" })', async () => {
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const db = makeDb();
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const { mockAgent, pool } = makeMockAgent();
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const svc = makeService(db, pool);
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pool
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.intercept({ path: '/api/federation/v1/capabilities', method: 'GET' })
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.replyWithError(new Error('ECONNREFUSED'));
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await expect(svc.capabilities(PEER_ID)).rejects.toMatchObject({
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code: 'NETWORK',
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peerId: PEER_ID,
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});
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await mockAgent.close();
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});
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});
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// ─── Invalid response body ─────────────────────────────────────────────────
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describe('invalid response body', () => {
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it('surfaces as FederationClientError({ code: "INVALID_RESPONSE" }) when body shape is wrong', async () => {
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const db = makeDb();
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const { mockAgent, pool } = makeMockAgent();
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const svc = makeService(db, pool);
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// capabilities returns wrong shape (missing required fields)
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pool
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.intercept({ path: '/api/federation/v1/capabilities', method: 'GET' })
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.reply(200, { totally: 'wrong' }, { headers: { 'content-type': 'application/json' } });
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await expect(svc.capabilities(PEER_ID)).rejects.toMatchObject({
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code: 'INVALID_RESPONSE',
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peerId: PEER_ID,
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});
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await mockAgent.close();
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});
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});
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// ─── Peer DB validation ────────────────────────────────────────────────────
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describe('peer validation (without resolveEntry spy)', () => {
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/**
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* These tests exercise the real `resolveEntry` path — no spy on resolveEntry.
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*/
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it('throws PEER_NOT_FOUND when peer is not in DB', async () => {
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// DB returns empty array (peer not found)
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const db = makeDb([]);
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const svc = new FederationClientService(db);
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await expect(svc.capabilities(PEER_ID)).rejects.toMatchObject({
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||||
code: 'PEER_NOT_FOUND',
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peerId: PEER_ID,
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});
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});
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it('throws PEER_INACTIVE when peer state is not "active"', async () => {
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const db = makeDb([makePeerRow({ state: 'suspended' })]);
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const svc = new FederationClientService(db);
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await expect(svc.capabilities(PEER_ID)).rejects.toMatchObject({
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||||
code: 'PEER_INACTIVE',
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||||
peerId: PEER_ID,
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||||
});
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||||
});
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||||
});
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||||
|
||||
// ─── Cache behaviour ───────────────────────────────────────────────────────
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||||
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||||
describe('cache behaviour', () => {
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||||
it('hits cache on second call — only one DB lookup happens', async () => {
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const db = makeDb();
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||||
const { mockAgent, pool } = makeMockAgent();
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||||
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||||
// Use real resolveEntry — let it build cache from DB
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||||
const svc = new FederationClientService(db);
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// First capabilities call — will build + cache entry
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pool
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||||
.intercept({ path: '/api/federation/v1/capabilities', method: 'GET' })
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||||
.reply(200, CAP_BODY, { headers: { 'content-type': 'application/json' } })
|
||||
.times(2); // allow two HTTP calls (one per call below)
|
||||
|
||||
// Spy on the private resolveEntry to count DB calls via the DB select spy
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||||
const selectSpy = vi.spyOn(db, 'select');
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||||
|
||||
// First call
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||||
await svc.capabilities(PEER_ID).catch(() => {
|
||||
// May fail with PEER_MISCONFIGURED if key unseal fails in test — that's OK
|
||||
// for this specific test which only cares about select spy count
|
||||
});
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||||
|
||||
// Second call — should use cache
|
||||
await svc.capabilities(PEER_ID).catch(() => {});
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||||
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||||
// DB select should have been called at most once (cache hit on second call)
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||||
expect(selectSpy).toHaveBeenCalledTimes(1);
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||||
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||||
await mockAgent.close();
|
||||
});
|
||||
|
||||
it('flushPeer() invalidates cache — next call re-reads DB', async () => {
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||||
const db = makeDb();
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||||
const { mockAgent, pool } = makeMockAgent();
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||||
const svc = makeService(db, pool);
|
||||
|
||||
pool
|
||||
.intercept({ path: '/api/federation/v1/capabilities', method: 'GET' })
|
||||
.reply(200, CAP_BODY, { headers: { 'content-type': 'application/json' } })
|
||||
.times(2);
|
||||
|
||||
// First call — populates cache (via mock resolveEntry)
|
||||
await svc.capabilities(PEER_ID);
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||||
|
||||
// Flush the cache
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||||
svc.flushPeer(PEER_ID);
|
||||
|
||||
// The spy on resolveEntry is still active — check it's called again after flush
|
||||
const resolveEntrySpy = vi.spyOn(
|
||||
svc as unknown as { resolveEntry: (peerId: string) => Promise<unknown> },
|
||||
'resolveEntry',
|
||||
);
|
||||
|
||||
// Second call after flush — should call resolveEntry again
|
||||
await svc.capabilities(PEER_ID);
|
||||
|
||||
// resolveEntry should have been called once after we started spying (post-flush)
|
||||
expect(resolveEntrySpy).toHaveBeenCalledTimes(1);
|
||||
|
||||
await mockAgent.close();
|
||||
});
|
||||
});
|
||||
|
||||
// ─── FederationClientError class ──────────────────────────────────────────
|
||||
|
||||
describe('FederationClientError', () => {
|
||||
it('is instanceof Error and FederationClientError', () => {
|
||||
const err = new FederationClientError({
|
||||
code: 'PEER_NOT_FOUND',
|
||||
message: 'test',
|
||||
peerId: PEER_ID,
|
||||
});
|
||||
expect(err).toBeInstanceOf(Error);
|
||||
expect(err).toBeInstanceOf(FederationClientError);
|
||||
expect(err.name).toBe('FederationClientError');
|
||||
});
|
||||
|
||||
it('carries status, code, and peerId', () => {
|
||||
const err = new FederationClientError({
|
||||
status: 403,
|
||||
code: 'FORBIDDEN',
|
||||
message: 'forbidden',
|
||||
peerId: PEER_ID,
|
||||
});
|
||||
expect(err.status).toBe(403);
|
||||
expect(err.code).toBe('FORBIDDEN');
|
||||
expect(err.peerId).toBe(PEER_ID);
|
||||
});
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user