Google Cloud IoT authentication for Postman

cloud-iot-pre-request-auth.js

// Keep jsrsasign libs assume they are working in a browser; fake these out..
var navigator = {
    appName: "Cloud IoT test script"
};
var window = {};

// Make sure that jsrsasign is in scope
eval(postman.getEnvironmentVariable('jsrsasign'));

// Cloud IoT HTTP URL is of form: https://cloudiotdevice.googleapis.com/v1/projects/{project-id}/locations/{location}}/registries/{registry}/devices/{device-id}/...
var audience = request.url.match(/.*\/v1\/projects\/([^\/]+)\/locations\/.*/)[1];
if (audience == "{{projectId}}") {
    audience = postman.getEnvironmentVariable("projectId");
}
var iat = Math.floor(Date.now() / 1000);
var ttl = parseInt(postman.getEnvironmentVariable("jwtTTL") || "60");

var privKey = postman.getEnvironmentVariable("rsaPrivKey");
var authToken = KJUR.jws.JWS.sign(null, { 'alg': 'RS256', 'typ': 'JWT' }, { 'iat': iat, 'exp': iat + ttl, 'aud': audience}, privKey);
postman.setEnvironmentVariable("authToken", authToken);

load-jsrsasign-test.js

// Add this as test script for GET https://cdnjs.cloudflare.com/ajax/libs/jsrsasign/8.0.4/jsrsasign-all-min.js
// to retrieve and add jsrsasign library to postman requests
postman.setEnvironmentVariable('jsrsasign', responseBody);