如何使用Apps Script生成NetSuite请求签名？

错误返回内容：

{"error" : {"code" : "INVALID_LOGIN_ATTEMPT", "message" : "Invalid login attempt."}}

我用Apps Script发送GET请求调用NetSuite接口时，卡在签名生成环节，查阅官方文档后仍无法解决，每次都返回上面的登录失败错误。

我怀疑问题出在text和key参数的编码及构造逻辑上，具体疑问点：

• 不确定哪些参数需要UTF-8编码，哪些需要Base64编码；
• 已知key由consumer secret和token secret拼接而成，但不清楚编码操作是在拼接前还是拼接后执行；
• 已按照文档示例格式构造text参数（示例格式：POST&https%3A%2F%2F1234567.restlets.api.netsuite.com%2Frest%2Frequesttoken&oauth_callback%3Dhttps%253A%252F%252Fmy.example.com%252FTBA%252F%253FcallbackRequest%26oauth_consumer_key%3D60712990bc09623786e7047c226bcb3f86d49dca0b04efc21001dc76d97a81f5%26oauth_nonce%3DbUvpxBX93OWo0FLswq5M%26oauth_signature_method%3DHMAC-SHA256%26oauth_timestamp%3D1575998103%26oauth_version%3D1.0%26role%3D45678），但不确定是否还需要额外编码。

当前使用的Apps Script代码 #

function getRequest(){
  
  let url = "";
  let marcaDeTiempo = timeEstampd(); //this is the timestamp
  let text = "";
  let consumerSecret = "";
  let tokenSecret = "";
  let key = consumerSecret + "&" + tokenSecret;
  
  let signature = crypto(text, key);
  
  var formData = {
    'Authorization':  `OAuth realm=\"\",oauth_consumer_key=\"\",oauth_token=\"\",oauth_signature_method=\"HMAC-SHA256\",oauth_timestamp=\"${marcaDeTiempo}\",oauth_nonce=\"\",oauth_version=\"1.0\",oauth_signature=\"${signature}\"`,
    'Cookie': '',
    'Content-type': 'application/json'
  };

  var options = {
    method : 'get',
    headers : formData,
    "muteHttpExceptions": true
  };

  let response = UrlFetchApp.fetch(url, options); 

  Logger.log(response);
}

//function to create the signature
function crypto(message, secret){
  var byteSignature = Utilities.computeHmacSha256Signature(message, secret);
  // convert byte array to hex string Charset.UTF_8
  var signature = byteSignature.reduce(function(str,chr){
    chr = (chr < 0 ? chr + 256 : chr).toString(16);
    return str + (chr.length==1?'0':'') + chr;
  },'' 
  );

  //Logger.log(typeof signature);
  return Utilities.base64EncodeWebSafe(byteSignature);
}

//function to generate timestamp
function timeEstampd(){
  const currentTime = new Date();
  return currentTime.getTime();
}

内容的提问来源于stack exchange，提问作者P CP