MCP Server for Lychee Redmine

/** * Logger Service * Provides structured logging with sensitive data masking */ export type LogLevel = 'DEBUG' | 'INFO' | 'WARN' | 'ERROR'; interface LogEntry { timestamp: string; level: LogLevel; message: string; meta?: Record<string, unknown>; error?: { name: string; message: string; stack?: string; }; duration?: number; } const LOG_LEVELS: Record<LogLevel, number> = { DEBUG: 0, INFO: 1, WARN: 2, ERROR: 3, }; const SENSITIVE_FIELDS = ['apiKey', 'api_key', 'password', 'token', 'secret']; /** * Masks sensitive data in metadata */ function maskSensitiveData( meta: Record<string, unknown> ): Record<string, unknown> { const masked: Record<string, unknown> = {}; for (const [key, value] of Object.entries(meta)) { if (SENSITIVE_FIELDS.includes(key)) { masked[key] = '***MASKED***'; } else { masked[key] = value; } } return masked; } /** * Gets current log level from environment or defaults to INFO */ function getCurrentLogLevel(): LogLevel { const envLevel = process.env['LOG_LEVEL']?.toUpperCase(); if ( envLevel === 'DEBUG' || envLevel === 'INFO' || envLevel === 'WARN' || envLevel === 'ERROR' ) { return envLevel; } return 'INFO'; } /** * Checks if a log level should be output based on current configuration */ function shouldLog(level: LogLevel): boolean { const currentLevel = getCurrentLogLevel(); return LOG_LEVELS[level] >= LOG_LEVELS[currentLevel]; } /** * Outputs a log entry to console */ function outputLog(entry: LogEntry): void { const output = JSON.stringify(entry); if (entry.level === 'ERROR') { console.error(output); } else { console.log(output); } } /** * Creates a log entry with timestamp */ function createLogEntry( level: LogLevel, message: string, meta?: Record<string, unknown> ): LogEntry { const entry: LogEntry = { timestamp: new Date().toISOString(), level, message, }; if (meta) { entry.meta = maskSensitiveData(meta); } return entry; } export const logger = { debug(message: string, meta?: Record<string, unknown>): void { if (!shouldLog('DEBUG')) return; const entry = createLogEntry('DEBUG', message, meta); outputLog(entry); }, info(message: string, meta?: Record<string, unknown>): void { if (!shouldLog('INFO')) return; const entry = createLogEntry('INFO', message, meta); outputLog(entry); }, warn(message: string, meta?: Record<string, unknown>): void { if (!shouldLog('WARN')) return; const entry = createLogEntry('WARN', message, meta); outputLog(entry); }, error(message: string, error: Error, meta?: Record<string, unknown>): void { if (!shouldLog('ERROR')) return; const entry = createLogEntry('ERROR', message, meta); entry.error = { name: error.name, message: error.message, stack: error.stack, }; outputLog(entry); }, async measureTime<T>(label: string, fn: () => Promise<T>): Promise<T> { const start = Date.now(); try { const result = await fn(); const duration = Date.now() - start; if (shouldLog('INFO')) { const entry = createLogEntry('INFO', `${label} completed`); entry.duration = duration; outputLog(entry); } return result; } catch (error) { const duration = Date.now() - start; if (shouldLog('ERROR') && error instanceof Error) { const entry = createLogEntry('ERROR', `${label} failed`); entry.duration = duration; entry.error = { name: error.name, message: error.message, stack: error.stack, }; outputLog(entry); } throw error; } }, };