JHipster authentication using Postman and JWT

Question

I\'d been using the Postman in-tab extension to tests calls to call JHipster resource API\'s and found that it worked great (JHipster setup to use OAuth2). I authenticated

Answer 1

If you have deployed a single microservice and you want to test it in isolation you can configure Postman to build a JWT token using a pre-request script.

1. Go to the application-dev.yml file generated by JHipster and grab the base64-secret value:

security:
    authentication:
        jwt:
            # This token must be encoded using Base64 and be at least 256 bits long (you can type `openssl rand -base64 64` on your command line to generate a 512 bits one)
            base64-secret: N2Y2MmFkNzg2ZTI4NTZiZGEwMTZhYTAzOTBhMjgwMzlkMzU2MzRlZjJjZDA2MzQ0NGMxOGFlZThjOWY0MjkzNGVlOGE3ZjkxZGI5ZTQxOGY3MjEwNWUwYTUxMTUxODYxY2U4ZWMzZjVhMjg0NTZkNzlhNWUyMmEyNjQ5NzkxZmI=

2. Put the value in a variable named jhipster_jwt_secret inside the Postman Environment.

3. Configure your pre-request script (this is largely copied from a Gist):

function base64url(source) {
    // Encode in classical base64
    encodedSource = CryptoJS.enc.Base64.stringify(source);

    // Remove padding equal characters
    encodedSource = encodedSource.replace(/=+$/, '');

    // Replace characters according to base64url specifications
    encodedSource = encodedSource.replace(/\+/g, '-');
    encodedSource = encodedSource.replace(/\//g, '_');

    return encodedSource;
}

var header = {
    "typ": "JWT",
    "alg": "HS256"
};

var payload = {
  "sub": "user",
  "auth": "role"
};

var secret = CryptoJS.enc.Base64.parse(postman.getEnvironmentVariable("jhipster_jwt_secret"));

// encode header
var stringifiedHeader = CryptoJS.enc.Utf8.parse(JSON.stringify(header));
var encodedHeader = base64url(stringifiedHeader);

// encode data
var stringifiedPayload = CryptoJS.enc.Utf8.parse(JSON.stringify(payload));
var encodedPayload = base64url(stringifiedPayload);

// build token
var token = encodedHeader + "." + encodedPayload;

// sign token
var signature = CryptoJS.HmacSHA256(token, secret);
signature = base64url(signature);
var signedToken = token + "." + signature;

postman.setEnvironmentVariable("jwt_token", signedToken);

4. Inside the Authorization tab select "Bearer token" and write {{jwt_token}} in the Token input field.