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SMART COSMOS Authorization Server handles authentication throughout the microservice fleet

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package net.smartcosmos.cluster.auth;

import lombok.extern.slf4j.Slf4j;

import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpMethod;
import org.springframework.security.oauth2.provider.ClientDetails;
import org.springframework.security.oauth2.provider.ClientDetailsService;
import org.springframework.security.oauth2.provider.ClientRegistrationException;
import org.springframework.security.oauth2.provider.client.BaseClientDetails;
import org.springframework.web.client.RestTemplate;

/**
 * @author voor
 */
@Slf4j
public class SmartCosmosClientDetailsService implements ClientDetailsService {

    final private RestTemplate restTemplate;

    public SmartCosmosClientDetailsService(final RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    @Override
    public ClientDetails loadClientByClientId(String clientId)
            throws ClientRegistrationException {
        ParameterizedTypeReference responseType = new ParameterizedTypeReference() {
        };

        // Utilizing Ribbon load balancing client and Eureka service discovery to retrieve
        // the client (authorized application) from a micro-service running out of
        // process.
        BaseClientDetails details = this.restTemplate
                .exchange("http://smartcosmos-auth-client-service/{clientId}",
                        HttpMethod.GET, null, responseType, (Object) clientId)
                .getBody();

        log.info("Received response: {}", details);

        return details;
    }
}