You are developing a Spring Boot application where you have to integrate OAuth2 for securing REST APIs. How would you design the OAuth2 implementation to ensure that it is modular and doesn’t impact the existing codebase significantly?

  • Implement OAuth2 directly in the existing codebase, ensuring tight coupling for security.
  • Create a separate module or library for OAuth2 integration and follow OAuth2 best practices.
  • Implement OAuth2 as a set of API gateway filters to decouple security from the application.
  • Use a third-party OAuth2 service to handle security, reducing the need for in-house integration.
To ensure modularity and minimal impact on the existing codebase, it's best to create a separate module or library for OAuth2 integration. This allows you to follow best practices for OAuth2 implementation while keeping it decoupled from the application. Tight coupling (option 1) would make the codebase harder to maintain, and using an API gateway (option 3) might not be necessary if a modular approach is preferred. Using a third-party service (option 4) might not provide the same level of control as in-house integration.
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