Challenge: Securing APIs

Practice defining an API in Auth0 and collect access control parameters by updating our Credit-Check service.


For this exercise, you’ll define an M2M identity in Auth0 for your credit-check service and then update your code to support access control using OAuth and JWTs. Along the way, you’ll use the security bash scripts to request a valid JWT and then use it to make secured requests of your updated credit-check service.

Defining the API in Auth0 and collecting access control parameters

  1. First, sign into the Auth0 website and define or create a new API called bigco-credit-check. Then collect the five important access control parameters (name, client ID, client secret, domain, and identifier) and update your copy of the auth0.txt file in your security folder.
  2. Next, use the script to request a valid JWT access token for use in HTTP calls to your API. Copy the token value in the response into the curl-auth.txt file.
  3. Finally, use the website to validate the access token you were issued by the script.

Updating the credit-check-secure Node.js project

  1. First, update the project’s package collection by adding the proper OAuth packages using npm.
  2. Next, open the index.js file in the credit-check-secure project folder in the terminal below and update that file to reference the api-auth.js code file from the /darrt/lib folder. Add the security middleware into the Node/Express pipeline by adding the following lines to your index.js file:
//*********************************************** // start of auth support
var secure = require('./darrt/lib/api-auth.js'); app.use(secure.jwtCheck);
// end of auth support
  1. Next, open the /darrt/lib/api-auth.js file and update the auth object values to match the access control parameters you pulled from the Auth0 website in the previous step.

Testing your API security

Now you can try accessing your API to validate your security changes.

  1. First, try using a simple cURL http://localhost:8181/ call (without a security token) to confirm that your API call gets an HTTP 401 status code response.

Note: Don’t forget to run npm run dev in the usercode/onboarding-api/credit-check-secure folder in the second terminal by clicking the “+” sign.

  1. Now use the utility (with the access token from the previous step and other appropriate configuration settings) to make the same call. This time you should get the root response as expected, without any errors.

You now have a fully secured API service using OAuth and JWT.

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