import crypto from 'crypto'
import { nanoid } from 'nanoid'

// 生成签名字段
// paramStr 为key1=val1&key2=val2, key1, key2按字母升序

export function createSign(secretKey: string, paramStr: string, timestamp: number) {
  paramStr = `${paramStr}:${timestamp}${secretKey}`;
  return crypto.createHash('md5').update(paramStr, 'utf8').digest('hex');
}

export function generateId(length: number = 21) {
  return nanoid(length);
}