Implementing Spring Boot Security OAuth2 with Keycloak and Swagger UI

Learn how to implement Spring Boot Security OAuth2 with Keycloak and enable login via Swagger UI, complete with detailed code snippets and configuration steps.
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Implementing Spring Boot Security OAuth2 with Keycloak and Swagger UI: A Comprehensive Guide

In modern web application development, securing APIs is essential for safeguarding sensitive data. One way to achieve this is through the integration of Spring Boot Security with OAuth2, particularly when using popular identity management solutions like Keycloak. In this guide, we will delve into how to implement Spring Boot Security OAuth2 with Keycloak and also configure Swagger UI for user credential logins—an important feature for developers who want to explore their APIs effortlessly.

Understanding the Problem

You want to enable user authentication via Swagger UI using Keycloak and Spring Boot Security. Even though you've succeeded in generating bearer tokens through tools like Postman, the challenge lies in configuring user credentials to allow logging in directly from Swagger UI.

Solution Overview

To accomplish this, we need to adjust our Spring Boot configuration, specifically our security settings in the application, and modify the Swagger UI settings. Below, we provide a step-by-step breakdown of the necessary code and configurations.

Step 1: Setting Up Security Configuration

Let's start by reviewing and enhancing the security configuration. Update your SecurityConfig class as follows:

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Step 2: Define the JwtAuthConverter

The JwtAuthConverter enables the mapping of JWT tokens to spring security’s authentication objects. Here’s the configuration:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Configure Swagger for OAuth2

Next, we need to enhance our Swagger configuration to support OAuth2 authentication. Here’s how to do that:

[[See Video to Reveal this Text or Code Snippet]]

[[See Video to Reveal this Text or Code Snippet]]

Step 5: Testing the Configuration

Once all configurations are in place, you can start your Spring Boot application and navigate to the Swagger UI. You should see your OAuth2 security setup in action. The application will redirect you to the Keycloak login page, allowing you to authenticate using your defined client ID and secret.

Conclusion

Integrating Spring Boot Security with Keycloak and enabling OAuth2 login through Swagger UI can significantly enhance both the security and usability of your APIs. Following the steps outlined above, you should now have a functional setup that allows for proper authentication through a robust identity provider.

Feel free to share your experiences or any questions you might have regarding this implementation!