/**
* Structured JSON logger for the MCP server
*/
type LogLevel = 'debug' | 'info' | 'warn' | 'error';
const LOG_LEVELS: Record<LogLevel, number> = {
debug: 0,
info: 1,
warn: 2,
error: 3,
};
let currentLevel: LogLevel = 'info';
// ANSI color codes
const colors = {
reset: '\x1b[0m',
bold: '\x1b[1m',
dim: '\x1b[2m',
cyan: '\x1b[36m',
green: '\x1b[32m',
yellow: '\x1b[33m',
blue: '\x1b[34m',
magenta: '\x1b[35m',
gray: '\x1b[90m',
white: '\x1b[37m',
};
/**
* Set the minimum log level
*/
export function setLogLevel(level: LogLevel): void {
currentLevel = level;
}
interface LogEntry {
timestamp: string;
level: LogLevel;
message: string;
[key: string]: unknown;
}
function shouldLog(level: LogLevel): boolean {
return LOG_LEVELS[level] >= LOG_LEVELS[currentLevel];
}
function log(level: LogLevel, message: string, data?: Record<string, unknown>): void {
if (!shouldLog(level)) {
return;
}
const entry: LogEntry = {
timestamp: new Date().toISOString(),
level,
message,
...data,
};
const output = JSON.stringify(entry);
if (level === 'error') {
console.error(output);
} else if (level === 'warn') {
console.warn(output);
} else {
console.log(output);
}
}
export interface StartupConfig {
version: string;
host: string;
port: number;
logLevel: string;
enabledTools: string[];
disabledTools: string[];
totalTools: number;
rateLimitRequests: number;
rateLimitWindowMs: number;
allowedTenants: string | number;
readOnlyMode: boolean;
useTonl: boolean;
}
/**
* Print a pretty startup banner
*/
export function printStartupBanner(config: StartupConfig): void {
const { cyan, green, yellow, blue, magenta, gray, white, bold, dim, reset } = colors;
const baseUrl = `http://${config.host === '0.0.0.0' ? 'localhost' : config.host}:${config.port}`;
console.log();
console.log(`${cyan}${bold} ╔═══════════════════════════════════════════════════════════╗${reset}`);
console.log(`${cyan}${bold} ║${reset} ${cyan}${bold}║${reset}`);
console.log(`${cyan}${bold} ║${reset} ${blue}${bold}📧 Outlook OAuth MCP Server${reset} ${cyan}${bold}║${reset}`);
console.log(`${cyan}${bold} ║${reset} ${cyan}${bold}║${reset}`);
console.log(`${cyan}${bold} ╚═══════════════════════════════════════════════════════════╝${reset}`);
console.log();
// Server info
console.log(`${white}${bold} Server${reset}`);
console.log(`${gray} ├─${reset} Version: ${green}${config.version}${reset}`);
console.log(`${gray} ├─${reset} Host: ${white}${config.host}${reset}`);
console.log(`${gray} ├─${reset} Port: ${white}${config.port}${reset}`);
console.log(`${gray} └─${reset} Log level: ${white}${config.logLevel}${reset}`);
console.log();
// Tools info
console.log(`${white}${bold} Tools${reset}`);
console.log(`${gray} ├─${reset} Mode: ${config.readOnlyMode ? `${yellow}read-only${reset}` : `${green}read-write${reset}`}`);
console.log(`${gray} ├─${reset} Output: ${config.useTonl ? `${magenta}TONL${reset} ${dim}(token-optimized)${reset}` : `${white}JSON${reset}`}`);
console.log(`${gray} ├─${reset} Count: ${green}${config.enabledTools.length}${reset}${dim}/${config.totalTools}${reset}`);
console.log(`${gray} └─${reset} Enabled: ${dim}${config.enabledTools.join(', ')}${reset}`);
console.log();
// Rate limiting
console.log(`${white}${bold} Rate Limiting${reset}`);
console.log(`${gray} ├─${reset} Requests: ${white}${config.rateLimitRequests}${reset} ${dim}per window${reset}`);
console.log(`${gray} └─${reset} Window: ${white}${config.rateLimitWindowMs / 1000}s${reset}`);
console.log();
// Security
console.log(`${white}${bold} Security${reset}`);
console.log(`${gray} └─${reset} Tenants: ${typeof config.allowedTenants === 'number' ? `${white}${config.allowedTenants}${reset} ${dim}allowed${reset}` : `${magenta}all${reset}`}`);
console.log();
// Endpoints
console.log(`${white}${bold} Endpoints${reset}`);
console.log(`${gray} ├─${reset} MCP: ${cyan}${baseUrl}/mcp${reset}`);
console.log(`${gray} ├─${reset} Health: ${cyan}${baseUrl}/health${reset}`);
console.log(`${gray} └─${reset} OAuth: ${cyan}${baseUrl}/.well-known/oauth-protected-resource${reset}`);
console.log();
console.log(`${green}${bold} ✓ Server ready${reset}`);
console.log();
}
export const logger = {
debug: (message: string, data?: Record<string, unknown>) => log('debug', message, data),
info: (message: string, data?: Record<string, unknown>) => log('info', message, data),
warn: (message: string, data?: Record<string, unknown>) => log('warn', message, data),
error: (message: string, data?: Record<string, unknown>) => log('error', message, data),
};
export default logger;
