How We Create API Tokens Using Spring Boot

The text provides a comprehensive guide on implementing JWT authentication and authorization in a Spring Boot application, using a demo project available on GitHub. The guide explains the structure of a JSON Web Token (JWT), which is composed of a header, payload, and signature, and outlines how these tokens are used to authenticate and authorize users by storing claims such as username, roles, and token expiration. It describes the use of Spring Security's abstract classes to configure endpoint security and the creation of a JwtRequestFilter to manage authentication by checking the presence of a JWT in request headers. The document also introduces the concept of an API Token at the organization level, offering persistent access without the need for repeated JWT generation, and discusses how to generate, hash, and validate these tokens while ensuring they can be revoked if necessary. The implementation details include using SecureRandom for generating random strings, CRC32 for integrity checks, and hashing functions for secure storage of tokens. The guide highlights the advantages of using JWTs and API Tokens for application security and provides testing instructions to verify the setup, emphasizing the simplicity and security benefits of this approach.