AI BriefingBuilding a Spring-based OAuth 2.1 Authorization Server
Key point
Kakao Pay introduces the process of building an authorization server based on the **OAuth 2.1** spec using **Spring Authorization Server**.
Details
To strengthen API communication security between partner companies and servers, they adopted OAuth 2.1. For this, they used the Spring Authorization Server framework to build an authorization server.
OAuth 2.1 is a version that improves upon the security vulnerabilities of the existing OAuth 2.0. Authorization is performed through the protocol flow between Client, Resource Owner, Authorization Server, and Resource Server.
In particular, they implemented the Client Credentials Grant method to fit environments that require server-to-server communication. This method obtains an Access Token using a Client ID and Client Secret in a trusted section.
Spring Authorization Server operates based on Spring Security's SecurityFilterChain, and provides the following flexibility.
- Faithful implementation of the OAuth 2.1 spec
- Support for customizing various components such as AccessTokenRequestConverter
- Provides In-Memory and JDBC-based RegisteredClientRepository
- Ability to issue tokens in JWT form using JwtGenerator
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