// Simplified config for Resend MCP (no OAuth needed)
export type AuthStrategyType = 'bearer' | 'none';
export type UnifiedConfig = {
// Server
HOST: string;
PORT: number;
NODE_ENV: 'development' | 'production' | 'test';
// MCP
MCP_TITLE: string;
MCP_INSTRUCTIONS: string;
MCP_VERSION: string;
MCP_PROTOCOL_VERSION: string;
// Auth (bearer token for client access)
AUTH_ENABLED: boolean;
AUTH_STRATEGY: AuthStrategyType;
BEARER_TOKEN?: string;
// Resend API
RESEND_API_KEY?: string;
RESEND_DEFAULT_FROM?: string;
// Rate limiting
RPS_LIMIT: number;
CONCURRENCY_LIMIT: number;
// Logging
LOG_LEVEL: 'debug' | 'info' | 'warning' | 'error';
};
function parseBoolean(value: unknown): boolean {
return String(value || 'false').toLowerCase() === 'true';
}
function parseNumber(value: unknown, defaultValue: number): number {
const num = Number(value);
return Number.isFinite(num) ? num : defaultValue;
}
/**
* Parse environment variables into a unified config object.
* Works for both process.env (Node.js) and Workers env bindings.
*/
export function parseConfig(env: Record<string, unknown>): UnifiedConfig {
const authEnabled = parseBoolean(env.AUTH_ENABLED);
return {
HOST: String(env.HOST || '127.0.0.1'),
PORT: parseNumber(env.PORT, 3000),
NODE_ENV: (env.NODE_ENV as UnifiedConfig['NODE_ENV']) || 'development',
MCP_TITLE: String(env.MCP_TITLE || 'Resend'),
MCP_INSTRUCTIONS: String(
env.MCP_INSTRUCTIONS ||
'Use these tools to manage email contacts, segments, and send emails via Resend.',
),
MCP_VERSION: String(env.MCP_VERSION || '1.0.0'),
MCP_PROTOCOL_VERSION: String(env.MCP_PROTOCOL_VERSION || '2025-06-18'),
// Auth
AUTH_ENABLED: authEnabled,
AUTH_STRATEGY: authEnabled ? 'bearer' : 'none',
BEARER_TOKEN: env.BEARER_TOKEN as string | undefined,
// Resend
RESEND_API_KEY: (env.RESEND_API_KEY as string | undefined)?.trim(),
RESEND_DEFAULT_FROM: env.RESEND_DEFAULT_FROM as string | undefined,
// Rate limiting
RPS_LIMIT: parseNumber(env.RPS_LIMIT, 2), // Resend default is 2 req/s
CONCURRENCY_LIMIT: parseNumber(env.CONCURRENCY_LIMIT, 2),
LOG_LEVEL: (env.LOG_LEVEL as UnifiedConfig['LOG_LEVEL']) || 'info',
};
}
export function resolveConfig(): UnifiedConfig {
return parseConfig(process.env as Record<string, unknown>);
}
