mirror of
https://github.com/czlonkowski/n8n-mcp.git
synced 2026-02-06 05:23:08 +00:00
feat: implement session persistence for v2.19.0 (Phase 1 + Phase 2)
Phase 1 - Lazy Session Restoration (REQ-1, REQ-2, REQ-8): - Add onSessionNotFound hook for restoring sessions from external storage - Implement idempotent session creation to prevent race conditions - Add session ID validation for security (prevent injection attacks) - Comprehensive error handling (400/408/500 status codes) - 13 integration tests covering all scenarios Phase 2 - Session Management API (REQ-5): - getActiveSessions(): Get all active session IDs - getSessionState(sessionId): Get session state for persistence - getAllSessionStates(): Bulk session state retrieval - restoreSession(sessionId, context): Manual session restoration - deleteSession(sessionId): Manual session termination - 21 unit tests covering all API methods Benefits: - Sessions survive container restarts - Horizontal scaling support (no session stickiness needed) - Zero-downtime deployments - 100% backwards compatible Implementation Details: - Backend methods in http-server-single-session.ts - Public API methods in mcp-engine.ts - SessionState type exported from index.ts - Synchronous session creation and deletion for reliable testing - Version updated from 2.18.10 to 2.19.0 Tests: 34 passing (13 integration + 21 unit) Coverage: Full API coverage with edge cases Security: Session ID validation prevents SQL/NoSQL injection and path traversal 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
czlonkowski
545
tests/unit/session-restoration.test.ts
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545
tests/unit/session-restoration.test.ts
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@@ -0,0 +1,545 @@
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import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
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import { SingleSessionHTTPServer } from '../../src/http-server-single-session';
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import { InstanceContext } from '../../src/types/instance-context';
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import { SessionRestoreHook } from '../../src/types/session-restoration';
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// Mock dependencies
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vi.mock('../../src/utils/logger', () => ({
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logger: {
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info: vi.fn(),
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error: vi.fn(),
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warn: vi.fn(),
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debug: vi.fn()
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}
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}));
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vi.mock('dotenv');
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// Mock UUID generation to make tests predictable
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vi.mock('uuid', () => ({
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v4: vi.fn(() => 'test-session-id-1234-5678-9012-345678901234')
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}));
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// Mock transport
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vi.mock('@modelcontextprotocol/sdk/server/streamableHttp.js', () => ({
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StreamableHTTPServerTransport: vi.fn().mockImplementation((options: any) => {
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const mockTransport = {
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handleRequest: vi.fn().mockImplementation(async (req: any, res: any, body?: any) => {
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if (body && body.method === 'initialize') {
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res.setHeader('Mcp-Session-Id', mockTransport.sessionId || 'test-session-id');
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}
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res.status(200).json({
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jsonrpc: '2.0',
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result: { success: true },
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id: body?.id || 1
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});
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}),
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close: vi.fn().mockResolvedValue(undefined),
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sessionId: null as string | null,
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onclose: null as (() => void) | null
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};
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if (options?.sessionIdGenerator) {
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const sessionId = options.sessionIdGenerator();
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mockTransport.sessionId = sessionId;
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if (options.onsessioninitialized) {
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setTimeout(() => {
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options.onsessioninitialized(sessionId);
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}, 0);
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}
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}
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return mockTransport;
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})
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}));
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vi.mock('@modelcontextprotocol/sdk/server/sse.js', () => ({
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SSEServerTransport: vi.fn().mockImplementation(() => ({
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close: vi.fn().mockResolvedValue(undefined)
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}))
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}));
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vi.mock('../../src/mcp/server', () => ({
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N8NDocumentationMCPServer: vi.fn().mockImplementation(() => ({
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connect: vi.fn().mockResolvedValue(undefined)
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}))
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}));
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const mockConsoleManager = {
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wrapOperation: vi.fn().mockImplementation(async (fn: () => Promise<any>) => {
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return await fn();
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})
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};
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vi.mock('../../src/utils/console-manager', () => ({
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ConsoleManager: vi.fn(() => mockConsoleManager)
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}));
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vi.mock('../../src/utils/url-detector', () => ({
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getStartupBaseUrl: vi.fn((host: string, port: number) => `http://localhost:${port || 3000}`),
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formatEndpointUrls: vi.fn((baseUrl: string) => ({
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health: `${baseUrl}/health`,
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mcp: `${baseUrl}/mcp`
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})),
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detectBaseUrl: vi.fn((req: any, host: string, port: number) => `http://localhost:${port || 3000}`)
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}));
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vi.mock('../../src/utils/version', () => ({
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PROJECT_VERSION: '2.19.0'
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}));
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vi.mock('@modelcontextprotocol/sdk/types.js', () => ({
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isInitializeRequest: vi.fn((request: any) => {
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return request && request.method === 'initialize';
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})
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}));
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// Create handlers storage for Express mock
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const mockHandlers: { [key: string]: any[] } = {
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get: [],
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post: [],
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delete: [],
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use: []
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};
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// Mock Express
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vi.mock('express', () => {
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const mockExpressApp = {
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get: vi.fn((path: string, ...handlers: any[]) => {
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mockHandlers.get.push({ path, handlers });
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return mockExpressApp;
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}),
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post: vi.fn((path: string, ...handlers: any[]) => {
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mockHandlers.post.push({ path, handlers });
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return mockExpressApp;
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}),
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delete: vi.fn((path: string, ...handlers: any[]) => {
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mockHandlers.delete.push({ path, handlers });
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return mockExpressApp;
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}),
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use: vi.fn((handler: any) => {
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mockHandlers.use.push(handler);
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return mockExpressApp;
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}),
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set: vi.fn(),
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listen: vi.fn((port: number, host: string, callback?: () => void) => {
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if (callback) callback();
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return {
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on: vi.fn(),
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close: vi.fn((cb: () => void) => cb()),
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address: () => ({ port: 3000 })
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};
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})
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};
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interface ExpressMock {
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(): typeof mockExpressApp;
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json(): (req: any, res: any, next: any) => void;
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}
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const expressMock = vi.fn(() => mockExpressApp) as unknown as ExpressMock;
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expressMock.json = vi.fn(() => (req: any, res: any, next: any) => {
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req.body = req.body || {};
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next();
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});
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return {
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default: expressMock,
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Request: {},
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Response: {},
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NextFunction: {}
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};
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});
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describe('Session Restoration (Phase 1 - REQ-1, REQ-2, REQ-8)', () => {
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const originalEnv = process.env;
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const TEST_AUTH_TOKEN = 'test-auth-token-with-more-than-32-characters';
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let server: SingleSessionHTTPServer;
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let consoleLogSpy: any;
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let consoleWarnSpy: any;
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let consoleErrorSpy: any;
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beforeEach(() => {
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// Reset environment
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process.env = { ...originalEnv };
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process.env.AUTH_TOKEN = TEST_AUTH_TOKEN;
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process.env.PORT = '0';
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process.env.NODE_ENV = 'test';
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// Mock console methods
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consoleLogSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
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consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
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consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
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// Clear all mocks and handlers
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vi.clearAllMocks();
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mockHandlers.get = [];
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mockHandlers.post = [];
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mockHandlers.delete = [];
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mockHandlers.use = [];
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});
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afterEach(async () => {
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// Restore environment
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process.env = originalEnv;
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// Restore console methods
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consoleLogSpy.mockRestore();
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consoleWarnSpy.mockRestore();
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consoleErrorSpy.mockRestore();
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// Shutdown server if running
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if (server) {
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await server.shutdown();
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server = null as any;
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}
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});
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// Helper functions
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function findHandler(method: 'get' | 'post' | 'delete', path: string) {
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const routes = mockHandlers[method];
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const route = routes.find(r => r.path === path);
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return route ? route.handlers[route.handlers.length - 1] : null;
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}
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function createMockReqRes() {
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const headers: { [key: string]: string } = {};
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const res = {
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status: vi.fn().mockReturnThis(),
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json: vi.fn().mockReturnThis(),
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send: vi.fn().mockReturnThis(),
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setHeader: vi.fn((key: string, value: string) => {
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headers[key.toLowerCase()] = value;
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}),
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sendStatus: vi.fn().mockReturnThis(),
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headersSent: false,
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finished: false,
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statusCode: 200,
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getHeader: (key: string) => headers[key.toLowerCase()],
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headers
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};
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const req = {
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method: 'POST',
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path: '/mcp',
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url: '/mcp',
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originalUrl: '/mcp',
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headers: {} as Record<string, string>,
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body: {},
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ip: '127.0.0.1',
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readable: true,
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readableEnded: false,
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complete: true,
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get: vi.fn((header: string) => (req.headers as Record<string, string>)[header.toLowerCase()])
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};
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return { req, res };
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}
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describe('REQ-8: Security-Hardened Session ID Validation', () => {
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it('should accept valid UUIDv4 session IDs', () => {
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server = new SingleSessionHTTPServer();
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const validUUIDs = [
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'550e8400-e29b-41d4-a716-446655440000',
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'f47ac10b-58cc-4372-a567-0e02b2c3d479',
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'a1b2c3d4-e5f6-4789-abcd-1234567890ab'
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];
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for (const sessionId of validUUIDs) {
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expect((server as any).isValidSessionId(sessionId)).toBe(true);
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}
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});
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it('should accept multi-tenant instance session IDs', () => {
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server = new SingleSessionHTTPServer();
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const multiTenantIds = [
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'instance-user123-abc-550e8400-e29b-41d4-a716-446655440000',
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'instance-tenant456-xyz-f47ac10b-58cc-4372-a567-0e02b2c3d479'
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];
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for (const sessionId of multiTenantIds) {
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expect((server as any).isValidSessionId(sessionId)).toBe(true);
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}
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});
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it('should reject session IDs with SQL injection patterns', () => {
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server = new SingleSessionHTTPServer();
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const sqlInjectionIds = [
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"'; DROP TABLE sessions; --",
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"1' OR '1'='1",
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"admin'--",
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"1'; DELETE FROM sessions WHERE '1'='1"
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];
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for (const sessionId of sqlInjectionIds) {
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expect((server as any).isValidSessionId(sessionId)).toBe(false);
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}
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});
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it('should reject session IDs with NoSQL injection patterns', () => {
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server = new SingleSessionHTTPServer();
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const nosqlInjectionIds = [
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'{"$ne": null}',
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'{"$gt": ""}',
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'{$where: "1==1"}',
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'[$regex]'
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];
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for (const sessionId of nosqlInjectionIds) {
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expect((server as any).isValidSessionId(sessionId)).toBe(false);
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}
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});
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it('should reject session IDs with path traversal attempts', () => {
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server = new SingleSessionHTTPServer();
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const pathTraversalIds = [
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'../../../etc/passwd',
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'..\\..\\..\\windows\\system32',
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'session/../admin',
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'session/./../../config'
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];
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for (const sessionId of pathTraversalIds) {
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expect((server as any).isValidSessionId(sessionId)).toBe(false);
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}
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});
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it('should reject session IDs that are too short (DoS protection)', () => {
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server = new SingleSessionHTTPServer();
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const tooShortIds = [
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'a',
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'ab',
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'123',
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'12345678901234567' // 17 chars (minimum is 20)
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];
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for (const sessionId of tooShortIds) {
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expect((server as any).isValidSessionId(sessionId)).toBe(false);
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}
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});
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it('should reject session IDs that are too long (DoS protection)', () => {
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server = new SingleSessionHTTPServer();
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const tooLongId = 'a'.repeat(101); // Maximum is 100 chars
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expect((server as any).isValidSessionId(tooLongId)).toBe(false);
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});
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it('should reject empty or null session IDs', () => {
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server = new SingleSessionHTTPServer();
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expect((server as any).isValidSessionId('')).toBe(false);
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expect((server as any).isValidSessionId(null)).toBe(false);
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expect((server as any).isValidSessionId(undefined)).toBe(false);
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});
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it('should reject session IDs with special characters', () => {
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server = new SingleSessionHTTPServer();
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const specialCharIds = [
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'session<script>alert(1)</script>',
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'session!@#$%^&*()',
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'session\x00null-byte',
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'session\r\nnewline'
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];
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for (const sessionId of specialCharIds) {
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expect((server as any).isValidSessionId(sessionId)).toBe(false);
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}
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});
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});
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describe('REQ-2: Idempotent Session Creation', () => {
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it('should return same session ID for multiple concurrent createSession calls', async () => {
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const mockContext: InstanceContext = {
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n8nApiUrl: 'https://test.n8n.cloud',
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n8nApiKey: 'test-api-key',
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instanceId: 'tenant-123'
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};
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server = new SingleSessionHTTPServer();
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const sessionId = 'instance-tenant123-abc-550e8400-e29b-41d4-a716-446655440000';
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// Call createSession multiple times with same session ID
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const id1 = (server as any).createSession(mockContext, sessionId);
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const id2 = (server as any).createSession(mockContext, sessionId);
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const id3 = (server as any).createSession(mockContext, sessionId);
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// All calls should return the same session ID (idempotent)
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expect(id1).toBe(sessionId);
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expect(id2).toBe(sessionId);
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expect(id3).toBe(sessionId);
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// NOTE: Transport creation is async via callback - tested in integration tests
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});
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it('should skip session creation if session already exists', async () => {
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const mockContext: InstanceContext = {
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n8nApiUrl: 'https://test.n8n.cloud',
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n8nApiKey: 'test-api-key',
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instanceId: 'tenant-123'
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};
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server = new SingleSessionHTTPServer();
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const sessionId = '550e8400-e29b-41d4-a716-446655440000';
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// Create session first time
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(server as any).createSession(mockContext, sessionId);
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const transport1 = (server as any).transports[sessionId];
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// Try to create again
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(server as any).createSession(mockContext, sessionId);
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const transport2 = (server as any).transports[sessionId];
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// Should be the same transport instance
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expect(transport1).toBe(transport2);
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});
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it('should validate session ID format when provided externally', async () => {
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const mockContext: InstanceContext = {
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n8nApiUrl: 'https://test.n8n.cloud',
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n8nApiKey: 'test-api-key',
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instanceId: 'tenant-123'
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};
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server = new SingleSessionHTTPServer();
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const invalidSessionId = "'; DROP TABLE sessions; --";
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expect(() => {
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(server as any).createSession(mockContext, invalidSessionId);
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}).toThrow('Invalid session ID format');
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});
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});
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describe('REQ-1: Session Restoration Hook Configuration', () => {
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it('should store restoration hook when provided', () => {
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const mockHook: SessionRestoreHook = vi.fn().mockResolvedValue({
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n8nApiUrl: 'https://test.n8n.cloud',
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n8nApiKey: 'test-api-key',
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instanceId: 'tenant-123'
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});
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|
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server = new SingleSessionHTTPServer({
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onSessionNotFound: mockHook,
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sessionRestorationTimeout: 5000
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});
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|
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// Verify hook is stored
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expect((server as any).onSessionNotFound).toBe(mockHook);
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expect((server as any).sessionRestorationTimeout).toBe(5000);
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});
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it('should work without restoration hook (backward compatible)', () => {
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server = new SingleSessionHTTPServer();
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// Verify hook is not configured
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expect((server as any).onSessionNotFound).toBeUndefined();
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});
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|
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// NOTE: Full restoration flow tests (success, failure, timeout, validation)
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// are in tests/integration/session-persistence.test.ts which tests the complete
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// end-to-end flow with real HTTP requests
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});
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||||
|
||||
describe('Backwards Compatibility', () => {
|
||||
it('should use default timeout when not specified', () => {
|
||||
server = new SingleSessionHTTPServer({
|
||||
onSessionNotFound: vi.fn()
|
||||
});
|
||||
|
||||
expect((server as any).sessionRestorationTimeout).toBe(5000);
|
||||
});
|
||||
|
||||
it('should use custom timeout when specified', () => {
|
||||
server = new SingleSessionHTTPServer({
|
||||
onSessionNotFound: vi.fn(),
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||||
sessionRestorationTimeout: 10000
|
||||
});
|
||||
|
||||
expect((server as any).sessionRestorationTimeout).toBe(10000);
|
||||
});
|
||||
|
||||
it('should work without any restoration options', () => {
|
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server = new SingleSessionHTTPServer();
|
||||
|
||||
expect((server as any).onSessionNotFound).toBeUndefined();
|
||||
expect((server as any).sessionRestorationTimeout).toBe(5000);
|
||||
});
|
||||
});
|
||||
|
||||
describe('Timeout Utility Method', () => {
|
||||
it('should reject after specified timeout', async () => {
|
||||
server = new SingleSessionHTTPServer();
|
||||
|
||||
const timeoutPromise = (server as any).timeout(100);
|
||||
|
||||
await expect(timeoutPromise).rejects.toThrow('Operation timed out after 100ms');
|
||||
});
|
||||
|
||||
it('should create TimeoutError', async () => {
|
||||
server = new SingleSessionHTTPServer();
|
||||
|
||||
try {
|
||||
await (server as any).timeout(50);
|
||||
expect.fail('Should have thrown TimeoutError');
|
||||
} catch (error: any) {
|
||||
expect(error.name).toBe('TimeoutError');
|
||||
expect(error.message).toContain('timed out');
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
describe('Session ID Generation', () => {
|
||||
it('should generate valid session IDs', () => {
|
||||
// Set environment for multi-tenant mode
|
||||
process.env.ENABLE_MULTI_TENANT = 'true';
|
||||
process.env.MULTI_TENANT_SESSION_STRATEGY = 'instance';
|
||||
|
||||
server = new SingleSessionHTTPServer();
|
||||
|
||||
const context: InstanceContext = {
|
||||
n8nApiUrl: 'https://test.n8n.cloud',
|
||||
n8nApiKey: 'test-api-key',
|
||||
instanceId: 'tenant-123'
|
||||
};
|
||||
|
||||
const sessionId = (server as any).generateSessionId(context);
|
||||
|
||||
// Should generate instance-prefixed ID in multi-tenant mode
|
||||
expect(sessionId).toContain('instance-');
|
||||
expect((server as any).isValidSessionId(sessionId)).toBe(true);
|
||||
|
||||
// Clean up env
|
||||
delete process.env.ENABLE_MULTI_TENANT;
|
||||
delete process.env.MULTI_TENANT_SESSION_STRATEGY;
|
||||
});
|
||||
|
||||
it('should generate standard UUIDs when not in multi-tenant mode', () => {
|
||||
// Ensure multi-tenant mode is disabled
|
||||
delete process.env.ENABLE_MULTI_TENANT;
|
||||
|
||||
server = new SingleSessionHTTPServer();
|
||||
|
||||
const sessionId = (server as any).generateSessionId();
|
||||
|
||||
// Should be a UUID format (mocked in tests but should be non-empty string with hyphens)
|
||||
expect(sessionId).toBeTruthy();
|
||||
expect(typeof sessionId).toBe('string');
|
||||
expect(sessionId.length).toBeGreaterThan(20); // At minimum should be longer than minimum session ID length
|
||||
expect(sessionId).toContain('-');
|
||||
|
||||
// NOTE: In tests, UUID is mocked so it may not pass strict validation
|
||||
// In production, generateSessionId uses real uuid.v4() which generates valid UUIDs
|
||||
});
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user