n8n-MCP
by czlonkowski
- n8n-mcp
- dist
http-server.js•20.8 kB
#!/usr/bin/env node
"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.loadAuthToken = loadAuthToken;
exports.startFixedHTTPServer = startFixedHTTPServer;
const express_1 = __importDefault(require("express"));
const tools_1 = require("./mcp/tools");
const tools_n8n_manager_1 = require("./mcp/tools-n8n-manager");
const server_1 = require("./mcp/server");
const logger_1 = require("./utils/logger");
const auth_1 = require("./utils/auth");
const version_1 = require("./utils/version");
const n8n_api_1 = require("./config/n8n-api");
const dotenv_1 = __importDefault(require("dotenv"));
const fs_1 = require("fs");
const url_detector_1 = require("./utils/url-detector");
const protocol_version_1 = require("./utils/protocol-version");
dotenv_1.default.config();
let expressServer;
let authToken = null;
function loadAuthToken() {
if (process.env.AUTH_TOKEN) {
logger_1.logger.info('Using AUTH_TOKEN from environment variable');
return process.env.AUTH_TOKEN;
}
if (process.env.AUTH_TOKEN_FILE) {
try {
const token = (0, fs_1.readFileSync)(process.env.AUTH_TOKEN_FILE, 'utf-8').trim();
logger_1.logger.info(`Loaded AUTH_TOKEN from file: ${process.env.AUTH_TOKEN_FILE}`);
return token;
}
catch (error) {
logger_1.logger.error(`Failed to read AUTH_TOKEN_FILE: ${process.env.AUTH_TOKEN_FILE}`, error);
console.error(`ERROR: Failed to read AUTH_TOKEN_FILE: ${process.env.AUTH_TOKEN_FILE}`);
console.error(error instanceof Error ? error.message : 'Unknown error');
return null;
}
}
return null;
}
function validateEnvironment() {
authToken = loadAuthToken();
if (!authToken || authToken.trim() === '') {
logger_1.logger.error('No authentication token found or token is empty');
console.error('ERROR: AUTH_TOKEN is required for HTTP mode and cannot be empty');
console.error('Set AUTH_TOKEN environment variable or AUTH_TOKEN_FILE pointing to a file containing the token');
console.error('Generate AUTH_TOKEN with: openssl rand -base64 32');
process.exit(1);
}
authToken = authToken.trim();
if (authToken.length < 32) {
logger_1.logger.warn('AUTH_TOKEN should be at least 32 characters for security');
console.warn('WARNING: AUTH_TOKEN should be at least 32 characters for security');
}
if (authToken === 'REPLACE_THIS_AUTH_TOKEN_32_CHARS_MIN_abcdefgh') {
logger_1.logger.warn('⚠️ SECURITY WARNING: Using default AUTH_TOKEN - CHANGE IMMEDIATELY!');
logger_1.logger.warn('Generate secure token with: openssl rand -base64 32');
if (process.env.MCP_MODE === 'http') {
console.warn('\n⚠️ SECURITY WARNING ⚠️');
console.warn('Using default AUTH_TOKEN - CHANGE IMMEDIATELY!');
console.warn('Generate secure token: openssl rand -base64 32');
console.warn('Update via Railway dashboard environment variables\n');
}
}
}
async function shutdown() {
logger_1.logger.info('Shutting down HTTP server...');
console.log('Shutting down HTTP server...');
if (expressServer) {
expressServer.close(() => {
logger_1.logger.info('HTTP server closed');
console.log('HTTP server closed');
process.exit(0);
});
setTimeout(() => {
logger_1.logger.error('Forced shutdown after timeout');
process.exit(1);
}, 10000);
}
else {
process.exit(0);
}
}
async function startFixedHTTPServer() {
validateEnvironment();
const app = (0, express_1.default)();
const trustProxy = process.env.TRUST_PROXY ? Number(process.env.TRUST_PROXY) : 0;
if (trustProxy > 0) {
app.set('trust proxy', trustProxy);
logger_1.logger.info(`Trust proxy enabled with ${trustProxy} hop(s)`);
}
app.use((req, res, next) => {
res.setHeader('X-Content-Type-Options', 'nosniff');
res.setHeader('X-Frame-Options', 'DENY');
res.setHeader('X-XSS-Protection', '1; mode=block');
res.setHeader('Strict-Transport-Security', 'max-age=31536000; includeSubDomains');
next();
});
app.use((req, res, next) => {
const allowedOrigin = process.env.CORS_ORIGIN || '*';
res.setHeader('Access-Control-Allow-Origin', allowedOrigin);
res.setHeader('Access-Control-Allow-Methods', 'POST, GET, OPTIONS');
res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization, Accept');
res.setHeader('Access-Control-Max-Age', '86400');
if (req.method === 'OPTIONS') {
res.sendStatus(204);
return;
}
next();
});
app.use((req, res, next) => {
logger_1.logger.info(`${req.method} ${req.path}`, {
ip: req.ip,
userAgent: req.get('user-agent'),
contentLength: req.get('content-length')
});
next();
});
const mcpServer = new server_1.N8NDocumentationMCPServer();
logger_1.logger.info('Created persistent MCP server instance');
app.get('/', (req, res) => {
const port = parseInt(process.env.PORT || '3000');
const host = process.env.HOST || '0.0.0.0';
const baseUrl = (0, url_detector_1.detectBaseUrl)(req, host, port);
const endpoints = (0, url_detector_1.formatEndpointUrls)(baseUrl);
res.json({
name: 'n8n Documentation MCP Server',
version: version_1.PROJECT_VERSION,
description: 'Model Context Protocol server providing comprehensive n8n node documentation and workflow management',
endpoints: {
health: {
url: endpoints.health,
method: 'GET',
description: 'Health check and status information'
},
mcp: {
url: endpoints.mcp,
method: 'GET/POST',
description: 'MCP endpoint - GET for info, POST for JSON-RPC'
}
},
authentication: {
type: 'Bearer Token',
header: 'Authorization: Bearer <token>',
required_for: ['POST /mcp']
},
documentation: 'https://github.com/czlonkowski/n8n-mcp'
});
});
app.get('/health', (req, res) => {
res.json({
status: 'ok',
mode: 'http-fixed',
version: version_1.PROJECT_VERSION,
uptime: Math.floor(process.uptime()),
memory: {
used: Math.round(process.memoryUsage().heapUsed / 1024 / 1024),
total: Math.round(process.memoryUsage().heapTotal / 1024 / 1024),
unit: 'MB'
},
timestamp: new Date().toISOString()
});
});
app.get('/version', (req, res) => {
res.json({
version: version_1.PROJECT_VERSION,
buildTime: new Date().toISOString(),
tools: tools_1.n8nDocumentationToolsFinal.map(t => t.name),
commit: process.env.GIT_COMMIT || 'unknown'
});
});
app.get('/test-tools', async (req, res) => {
try {
const result = await mcpServer.executeTool('get_node_essentials', { nodeType: 'nodes-base.httpRequest' });
res.json({ status: 'ok', hasData: !!result, toolCount: tools_1.n8nDocumentationToolsFinal.length });
}
catch (error) {
res.json({ status: 'error', message: error instanceof Error ? error.message : 'Unknown error' });
}
});
app.get('/mcp', (req, res) => {
res.json({
description: 'n8n Documentation MCP Server',
version: version_1.PROJECT_VERSION,
endpoints: {
mcp: {
method: 'POST',
path: '/mcp',
description: 'Main MCP JSON-RPC endpoint',
authentication: 'Bearer token required'
},
health: {
method: 'GET',
path: '/health',
description: 'Health check endpoint',
authentication: 'None'
},
root: {
method: 'GET',
path: '/',
description: 'API information',
authentication: 'None'
}
},
documentation: 'https://github.com/czlonkowski/n8n-mcp'
});
});
app.post('/mcp', async (req, res) => {
const startTime = Date.now();
const authHeader = req.headers.authorization;
if (!authHeader) {
logger_1.logger.warn('Authentication failed: Missing Authorization header', {
ip: req.ip,
userAgent: req.get('user-agent'),
reason: 'no_auth_header'
});
res.status(401).json({
jsonrpc: '2.0',
error: {
code: -32001,
message: 'Unauthorized'
},
id: null
});
return;
}
if (!authHeader.startsWith('Bearer ')) {
logger_1.logger.warn('Authentication failed: Invalid Authorization header format (expected Bearer token)', {
ip: req.ip,
userAgent: req.get('user-agent'),
reason: 'invalid_auth_format',
headerPrefix: authHeader.substring(0, Math.min(authHeader.length, 10)) + '...'
});
res.status(401).json({
jsonrpc: '2.0',
error: {
code: -32001,
message: 'Unauthorized'
},
id: null
});
return;
}
const token = authHeader.slice(7).trim();
const isValidToken = authToken &&
auth_1.AuthManager.timingSafeCompare(token, authToken);
if (!isValidToken) {
logger_1.logger.warn('Authentication failed: Invalid token', {
ip: req.ip,
userAgent: req.get('user-agent'),
reason: 'invalid_token'
});
res.status(401).json({
jsonrpc: '2.0',
error: {
code: -32001,
message: 'Unauthorized'
},
id: null
});
return;
}
try {
let body = '';
req.on('data', chunk => {
body += chunk.toString();
});
req.on('end', async () => {
try {
const jsonRpcRequest = JSON.parse(body);
logger_1.logger.debug('Received JSON-RPC request:', { method: jsonRpcRequest.method });
let response;
switch (jsonRpcRequest.method) {
case 'initialize':
const negotiationResult = (0, protocol_version_1.negotiateProtocolVersion)(jsonRpcRequest.params?.protocolVersion, jsonRpcRequest.params?.clientInfo, req.get('user-agent'), req.headers);
(0, protocol_version_1.logProtocolNegotiation)(negotiationResult, logger_1.logger, 'HTTP_SERVER_INITIALIZE');
response = {
jsonrpc: '2.0',
result: {
protocolVersion: negotiationResult.version,
capabilities: {
tools: {},
resources: {}
},
serverInfo: {
name: 'n8n-documentation-mcp',
version: version_1.PROJECT_VERSION
}
},
id: jsonRpcRequest.id
};
break;
case 'tools/list':
const tools = [...tools_1.n8nDocumentationToolsFinal];
if ((0, n8n_api_1.isN8nApiConfigured)()) {
tools.push(...tools_n8n_manager_1.n8nManagementTools);
}
response = {
jsonrpc: '2.0',
result: {
tools
},
id: jsonRpcRequest.id
};
break;
case 'tools/call':
const toolName = jsonRpcRequest.params?.name;
const toolArgs = jsonRpcRequest.params?.arguments || {};
try {
const result = await mcpServer.executeTool(toolName, toolArgs);
let responseText = JSON.stringify(result, null, 2);
const mcpResult = {
content: [
{
type: 'text',
text: responseText
}
]
};
if (toolName.startsWith('validate_')) {
const resultSize = responseText.length;
if (resultSize > 1000000) {
logger_1.logger.warn(`Validation tool ${toolName} response is very large (${resultSize} chars). ` +
`Truncating for HTTP transport safety.`);
mcpResult.content[0].text = responseText.substring(0, 999000) +
'\n\n[Response truncated due to size limits]';
}
else {
mcpResult.structuredContent = result;
}
}
response = {
jsonrpc: '2.0',
result: mcpResult,
id: jsonRpcRequest.id
};
}
catch (error) {
response = {
jsonrpc: '2.0',
error: {
code: -32603,
message: `Error executing tool ${toolName}: ${error instanceof Error ? error.message : 'Unknown error'}`
},
id: jsonRpcRequest.id
};
}
break;
default:
response = {
jsonrpc: '2.0',
error: {
code: -32601,
message: `Method not found: ${jsonRpcRequest.method}`
},
id: jsonRpcRequest.id
};
}
res.setHeader('Content-Type', 'application/json');
res.json(response);
const duration = Date.now() - startTime;
logger_1.logger.info('MCP request completed', {
duration,
method: jsonRpcRequest.method
});
}
catch (error) {
logger_1.logger.error('Error processing request:', error);
res.status(400).json({
jsonrpc: '2.0',
error: {
code: -32700,
message: 'Parse error',
data: error instanceof Error ? error.message : 'Unknown error'
},
id: null
});
}
});
}
catch (error) {
logger_1.logger.error('MCP request error:', error);
if (!res.headersSent) {
res.status(500).json({
jsonrpc: '2.0',
error: {
code: -32603,
message: 'Internal server error',
data: process.env.NODE_ENV === 'development'
? error.message
: undefined
},
id: null
});
}
}
});
app.use((req, res) => {
res.status(404).json({
error: 'Not found',
message: `Cannot ${req.method} ${req.path}`
});
});
app.use((err, req, res, next) => {
logger_1.logger.error('Express error handler:', err);
if (!res.headersSent) {
res.status(500).json({
jsonrpc: '2.0',
error: {
code: -32603,
message: 'Internal server error',
data: process.env.NODE_ENV === 'development' ? err.message : undefined
},
id: null
});
}
});
const port = parseInt(process.env.PORT || '3000');
const host = process.env.HOST || '0.0.0.0';
expressServer = app.listen(port, host, () => {
logger_1.logger.info(`n8n MCP Fixed HTTP Server started`, { port, host });
const baseUrl = (0, url_detector_1.getStartupBaseUrl)(host, port);
const endpoints = (0, url_detector_1.formatEndpointUrls)(baseUrl);
console.log(`n8n MCP Fixed HTTP Server running on ${host}:${port}`);
console.log(`Health check: ${endpoints.health}`);
console.log(`MCP endpoint: ${endpoints.mcp}`);
console.log('\nPress Ctrl+C to stop the server');
if (authToken === 'REPLACE_THIS_AUTH_TOKEN_32_CHARS_MIN_abcdefgh') {
setInterval(() => {
logger_1.logger.warn('⚠️ Still using default AUTH_TOKEN - security risk!');
if (process.env.MCP_MODE === 'http') {
console.warn('⚠️ REMINDER: Still using default AUTH_TOKEN - please change it!');
}
}, 300000);
}
if (process.env.BASE_URL || process.env.PUBLIC_URL) {
console.log(`\nPublic URL configured: ${baseUrl}`);
}
else if (process.env.TRUST_PROXY && Number(process.env.TRUST_PROXY) > 0) {
console.log(`\nNote: TRUST_PROXY is enabled. URLs will be auto-detected from proxy headers.`);
}
});
expressServer.on('error', (error) => {
if (error.code === 'EADDRINUSE') {
logger_1.logger.error(`Port ${port} is already in use`);
console.error(`ERROR: Port ${port} is already in use`);
process.exit(1);
}
else {
logger_1.logger.error('Server error:', error);
console.error('Server error:', error);
process.exit(1);
}
});
process.on('SIGTERM', shutdown);
process.on('SIGINT', shutdown);
process.on('uncaughtException', (error) => {
logger_1.logger.error('Uncaught exception:', error);
console.error('Uncaught exception:', error);
shutdown();
});
process.on('unhandledRejection', (reason, promise) => {
logger_1.logger.error('Unhandled rejection:', reason);
console.error('Unhandled rejection at:', promise, 'reason:', reason);
shutdown();
});
}
if (typeof require !== 'undefined' && require.main === module) {
startFixedHTTPServer().catch(error => {
logger_1.logger.error('Failed to start Fixed HTTP server:', error);
console.error('Failed to start Fixed HTTP server:', error);
process.exit(1);
});
}
//# sourceMappingURL=http-server.js.map
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