Autenticar em apiClient o usuário token JWT de outra apiServer

Já resolvi. Criei uma classe implementando AuthenticationProvider, efetuando dentro do method authenticate a autenticação na apiServer. E também criei outra Class implementando Principal para guardar o token do usuario.

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

@Component
public class AuthenticationProviderService implements AuthenticationProvider {

    @Value("${climatempo.url.LoginAuth}") // buscando url de auteticação na apiServer salva no application.properties
    private String urlLogin;

    private UserInfo login;

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        String name = authentication.getName();
        String password = authentication.getCredentials().toString();
        this.login = new UserInfo(name, password);
        System.out.println(this.login.toString());
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<UserInfo> response = restTemplate.postForEntity(urlLogin, this.login, UserInfo.class);
        if (response.getStatusCode().equals(HttpStatus.OK)) {
            this.login.setToken(response.getBody().getToken());
            this.login.setTipo(response.getBody().getTipo());
            System.out.println(this.login.toString());

            // use the credentials
            // and authenticate against the third-party system

            return new UsernamePasswordAuthenticationToken(this.login.getName(), authentication.getCredentials(), getAuthority());
        } else {
            System.err.println("Login e/ou Senha inválidos.");
            throw new UsernameNotFoundException("Login e/ou Senha inválidos.");
        }
    }

    @Override
    public boolean supports(Class<?> authentication) {
        return authentication.equals(UsernamePasswordAuthenticationToken.class);
    }

    private List<SimpleGrantedAuthority> getAuthority() {
        SimpleGrantedAuthority authority = new SimpleGrantedAuthority("ROLE_USER");
        List<SimpleGrantedAuthority> authorities = new ArrayList<SimpleGrantedAuthority>();
        authorities.add(authority);

        return authorities;
    }
}