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package com.example.apigateway.config;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.authority.mapping.GrantedAuthoritiesMapper;
import org.springframework.security.oauth2.client.oidc.userinfo.OidcReactiveOAuth2UserService;
import org.springframework.security.oauth2.client.oidc.userinfo.OidcUserRequest;
import org.springframework.security.oauth2.client.registration.ClientRegistration.ProviderDetails;
import org.springframework.security.oauth2.client.userinfo.ReactiveOAuth2UserService;
import org.springframework.security.oauth2.core.OAuth2AccessToken;
import org.springframework.security.oauth2.core.oidc.OidcIdToken;
import org.springframework.security.oauth2.core.oidc.OidcUserInfo;
import org.springframework.security.oauth2.core.oidc.user.DefaultOidcUser;
import org.springframework.security.oauth2.core.oidc.user.OidcUser;
import org.springframework.security.oauth2.core.oidc.user.OidcUserAuthority;
import org.springframework.security.oauth2.core.user.DefaultOAuth2User;
import org.springframework.security.oauth2.core.user.OAuth2UserAuthority;
import org.springframework.util.StringUtils;
import org.springframework.web.reactive.function.client.WebClient;
import com.example.apigateway.security.dto.UserResonseDto;
import reactor.core.publisher.Mono;
/**
* Ref:
* https://docs.spring.io/spring-security/reference/reactive/oauth2/login/advanced.html
*/
@Configuration
@EnableWebFluxSecurity
public class SecurityConfig {
private final WebClient webClient = WebClient.create(); // WebClient configured to point to your backend service
@Value("${app.userRolesUrl}")
private String userRolesUrl;
@Bean
public ReactiveOAuth2UserService<OidcUserRequest, OidcUser> oidcUserService() {
final OidcReactiveOAuth2UserService delegate = new OidcReactiveOAuth2UserService();
return (userRequest) -> {
// Delegate to the default implementation for loading a user
return delegate.loadUser(userRequest)
.flatMap((oidcUser) -> {
String username = oidcUser.getAttribute("sub");
return fetchRolesFromBackend(username)
.map(roles -> {
Set<GrantedAuthority> authorities = roles.stream()
.map(role -> new SimpleGrantedAuthority("ROLE_" + role.toUpperCase()))
.collect(Collectors.toSet());
// Keep original identity scopes if needed
authorities.addAll(oidcUser.getAuthorities());
ProviderDetails providerDetails = userRequest.getClientRegistration()
.getProviderDetails();
String userNameAttributeName = providerDetails.getUserInfoEndpoint()
.getUserNameAttributeName();
if (StringUtils.hasText(userNameAttributeName)) {
return new DefaultOidcUser(authorities, oidcUser.getIdToken(),
oidcUser.getUserInfo(), userNameAttributeName);
} else {
return new DefaultOidcUser(authorities, oidcUser.getIdToken(),
oidcUser.getUserInfo());
}
});
});
};
}
private Mono<List<String>> fetchRolesFromBackend(String username) {
Mono<List<String>> response = this.webClient.get()
.uri(userRolesUrl, username)
.retrieve()
.bodyToMono(UserResonseDto.class)
.map(UserResonseDto::getRoles)
.onErrorReturn(List.of("")); // Can return a String indicating a fallback role on backend failure
return response;
}
}
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