const CryptoJS = require('crypto')

class Tik {
  // 创建签名
  createSignature (secretKey, data) {
    const hmac = CryptoJS.createHmac('sha256', secretKey)
    hmac.update(this.toQueryString(data))
    return hmac.digest('hex')
  }
  // 将map转换为queryString
  toQueryString (data) {
    let queryString = ''
    for (let key in data) {
      queryString = queryString + `${key}=${data[key]}&`
    }
    return queryString.substring(0, queryString.length - 1)
  }
  // 获取最终QueryURL
  toFinalQueryURL (url, data, signature) {
    return url + '?' + this.toQueryString(data) + '&signature=' + signature
  }
}

module.exports = Tik