通过 Postman 进行 HMAC 身份验证

Question

我正在使用一个示例为 Web API 项目设置 HMAC 身份验证。

我试图让 Postman 在它的预请求脚本中构建和发送 GET 请求。但是请求总是以 401 失败，我不知道为什么。

邮递员预请求脚本：

var AppId = "4d53bce03ec34c0a911182d4c228ee6c";

var APIKey = "A93reRTUJHsCuQSHR+L3GxqOJyDmQpCgps102ciuabc=";

var requestURI = "http%3a%2f%2flocalhost%3a55441%2fapi%2fv1%2fdata";

var requestMethod = "GET";

var requestTimeStamp = "{{$timestamp}}";

var nonce = "1";

var requestContentBase64String = "";

var signatureRawData  = AppId + requestMethod + requestURI + requestTimeStamp +  nonce + requestContentBase64String; //check

var signature = CryptoJS.enc.Utf8.parse(signatureRawData);

var secretByteArray = CryptoJS.enc.Base64.parse(APIKey);

var signatureBytes = CryptoJS.HmacSHA256(signature,secretByteArray)

var requestSignatureBase64String = CryptoJS.enc.Base64.stringify(signatureBytes);

postman.setGlobalVariable("key", "amx " + AppId + ":" + requestSignatureBase64String + ":" + nonce + ":" + requestTimeStamp);

Answer 1

这是我在 Pre-Script 中使用的代码。它适用于任何查询 GET、PUT、POST、DELETE。您需要更改 AppId 和 APIKey 值，并在最后一行调整环境变量“hmacKey”的名称。function interpolate (value) {    const {Property} = require('postman-collection');    return Property.replaceSubstitutions(value, pm.variables.toObject());}var uuid = require('uuid');var moment = require("moment")var hmacPrefix = "hmac";var AppId = "4d53bce03ec34c0a911182d4c228ee6c";var APIKey = "A93reRTUJHsCuQSHR+L3GxqOJyDmQpCgps102ciuabc=";var requestURI = encodeURIComponent(pm.environment.values.substitute(pm.request.url, null, false).toString().toLowerCase());var requestMethod = pm.request.method;var requestTimeStamp = moment(new Date().toUTCString()).valueOf() / 1000;var nonce = uuid.v4();var requestContentBase64String = "";var bodyString = interpolate(pm.request.body.toString());if (bodyString) {    var md5 = CryptoJS.MD5(bodyString);    requestContentBase64String = CryptoJS.enc.Base64.stringify(md5);}var signatureRawData  = AppId + requestMethod + requestURI + requestTimeStamp +  nonce + requestContentBase64String; //checkvar signature = CryptoJS.enc.Utf8.parse(signatureRawData);var secretByteArray = CryptoJS.enc.Base64.parse(APIKey);var signatureBytes = CryptoJS.HmacSHA256(signature,secretByteArray);var requestSignatureBase64String = CryptoJS.enc.Base64.stringify(signatureBytes);var hmacKey = hmacPrefix + " " + AppId + ":" + requestSignatureBase64String + ":" + nonce + ":" + requestTimeStamp;postman.setEnvironmentVariable("hmacKey", hmacKey);

Answer 2

它实际上与 Postman 提供的所有事物的可变占位符有关。在测试占位符 {{$timestamp}} 的面值时传递了一个有效值。当我剥离签名以仅从一个段开始时，我成功地进行了身份验证。当然，直到我把时间戳占位符放回去。当我将占位符换成标题中传递的实际值时，它工作正常。我只能得出结论，一定有一些我看不到的额外字符。也许在邮递员方面创建签名时。该问题扩展到其他占位符，例如 {{$guid}}。