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JwtAuthentication  authentication = (JwtAuthentication) SecurityContextHolder.getContext().getAuthentication().getPrincipal()


@RestController
@RequestMapping("/api")
public class UserRestController {

  private final UserService userService;

  private final AuthenticationManager authenticationManager;

  public UserRestController(UserService userService, AuthenticationManager authenticationManager) {
    this.userService = userService;
    this.authenticationManager = authenticationManager;
  }

  @GetMapping(path = "/user/me")
  public UserDto me(@AuthenticationPrincipal JwtAuthentication authentication) {
    return userService.findByLoginId(authentication.username)
      .map(user ->
        new UserDto(authentication.token, authentication.username, user.getGroup().getName())
      )
      .orElseThrow(() -> new IllegalArgumentException("Could not found user for " + authentication.username));
  }

  @PostMapping(path = "/user/login")
  public UserDto login(@RequestBody LoginRequest request) {
    JwtAuthenticationToken authToken = new JwtAuthenticationToken(request.getPrincipal(), request.getCredentials());
    Authentication resultToken = authenticationManager.authenticate(authToken);
    JwtAuthentication authentication = (JwtAuthentication) resultToken.getPrincipal();
    User user = (User) resultToken.getDetails();
    return new UserDto(authentication.token, authentication.username, user.getGroup().getName());
  }

}

JwtAuthenticationProvider 구현 일부 발췌