Postman pre-request script for Joyent Signature Authentication Scheme

prerequest.js

// Postman pre-request script for Joyent Signature Authentication
// (https://github.com/joyent/node-http-signature/blob/master/http_signing.md)
//
// Set the following vars in your Postman environment:
//   apiHost
//   apiKey
//   apiSecret
//
// Set the following headers in Postman (copy/paste):
//   Authorization: Signature keyId="{{apiKey}}",algorithm="hmac-sha256",headers="host date",signature="{{signature}}"
//   Date: {{date}}
//
// Add the following pre-request script (copy/paste):
const apiSecret = postman.getEnvironmentVariable('apiSecret');
const host = postman.getEnvironmentVariable('apiHost');
const date = new Date().toUTCString();

var signStr = [
    'host: ' + host,
    'date: ' + date
].join("\n");

var signature = CryptoJS.HmacSHA256(signStr, apiSecret).toString(CryptoJS.enc.Base64);

postman.setGlobalVariable("date", date);
postman.setGlobalVariable("signature", signature);