c# - 通过 Postman 进行 HMAC 身份验证

Question

我正在使用一个示例来为 Web API 项目设置 HMAC 身份验证。原始示例源代码/项目可在此处获得:

http://bitoftech.net/2014/12/15/secure-asp-net-web-api-using-api-key-authentication-hmac-authentication/

我正在尝试让 Postman 在其预请求脚本中构建并发送 GET 请求。然而，请求总是失败并显示 401，我不知道为什么。
postman 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

这是我在我的 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; //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);

var hmacKey = hmacPrefix + " " + AppId + ":" + requestSignatureBase64String + ":" + nonce + ":" + requestTimeStamp;
postman.setEnvironmentVariable("hmacKey", hmacKey);