Oura MCP Server

import { Request, Response, NextFunction } from 'express'; import { logger } from '../utils/logger.js'; /** * Error handling middleware for Express */ export function errorHandler( err: Error, req: Request, res: Response, _next: NextFunction ): void { logger.error('Request error:', err); // Determine error type and status code let statusCode = 500; let errorCode = -32603; // Internal error let message = 'Internal server error'; let details = err.message; // Parse error message for specific cases if (err.message.includes('Validation error')) { statusCode = 400; errorCode = -32602; // Invalid params message = 'Invalid parameters'; } else if (err.message.includes('authenticate') || err.message.includes('OAuth')) { statusCode = 403; errorCode = -32000; // Server error (OAuth not authenticated) message = 'Authentication required'; } else if (err.message.includes('Rate limit')) { statusCode = 429; errorCode = -32001; // Server error (Rate limit exceeded) message = 'Rate limit exceeded'; } else if (err.message.includes('Oura API')) { statusCode = 502; errorCode = -32002; // Server error (Oura API error) message = 'Oura API error'; } else if (err.message.includes('Not found')) { statusCode = 404; errorCode = -32601; // Method not found message = 'Not found'; } // Sanitize error details in production to prevent information leakage if (process.env.NODE_ENV === 'production') { // In production, only send generic error messages if (statusCode === 500) { details = 'An internal error occurred. Please try again later.'; } else if (statusCode === 502) { details = 'External service temporarily unavailable. Please try again later.'; } else { // For client errors, sanitize but keep useful info details = details.split('\n')[0]; // Only first line // Remove any file paths or stack traces details = details.replace(/\/[^\s]+/g, '').replace(/at .+/g, '').trim(); } } // Send JSON-RPC error response res.status(statusCode).json({ jsonrpc: '2.0', id: (req.body as any)?.id || null, error: { code: errorCode, message, data: { details, }, }, }); } /** * 404 handler for unknown routes */ export function notFoundHandler(req: Request, res: Response): void { res.status(404).json({ jsonrpc: '2.0', id: null, error: { code: -32601, message: 'Not found', data: { details: `Route ${req.method} ${req.path} not found`, }, }, }); } /** * Async handler wrapper to catch errors in async route handlers */ export function asyncHandler( fn: (req: Request, res: Response, next: NextFunction) => Promise<any> ) { return (req: Request, res: Response, next: NextFunction) => { Promise.resolve(fn(req, res, next)).catch(next); }; }