/
ReactiveResourceServerApplication.java
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/
ReactiveResourceServerApplication.java
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package com.baeldung;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.security.authentication.AbstractAuthenticationToken;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.AuthenticationCredentialsNotFoundException;
import org.springframework.security.config.annotation.method.configuration.EnableReactiveMethodSecurity;
import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
import org.springframework.security.config.web.server.ServerHttpSecurity;
import org.springframework.security.config.web.server.ServerHttpSecurity.CsrfSpec;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.ReactiveSecurityContextHolder;
import org.springframework.security.oauth2.core.oidc.StandardClaimNames;
import org.springframework.security.oauth2.jwt.Jwt;
import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationToken;
import org.springframework.security.oauth2.server.resource.authentication.ReactiveJwtAuthenticationConverter;
import org.springframework.security.web.server.SecurityWebFilterChain;
import org.springframework.security.web.server.context.NoOpServerSecurityContextRepository;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import lombok.RequiredArgsConstructor;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
@SpringBootApplication
public class ReactiveResourceServerApplication {
public static void main(String[] args) {
SpringApplication.run(ReactiveResourceServerApplication.class, args);
}
@Configuration
@EnableWebFluxSecurity
@EnableReactiveMethodSecurity
static class SecurityConfig {
@Bean
SecurityWebFilterChain springSecurityFilterChain(ServerHttpSecurity http, Converter<Jwt, Mono<AbstractAuthenticationToken>> authenticationConverter) {
http.oauth2ResourceServer(resourceServer -> resourceServer.jwt(jwtResourceServer -> jwtResourceServer.jwtAuthenticationConverter(authenticationConverter)));
http.securityContextRepository(NoOpServerSecurityContextRepository.getInstance());
http.csrf(CsrfSpec::disable);
http.exceptionHandling(eh -> eh.accessDeniedHandler((var exchange, var ex) -> exchange.getPrincipal()
.flatMap(principal -> {
final var response = exchange.getResponse();
response.setStatusCode(principal instanceof AnonymousAuthenticationToken ? HttpStatus.UNAUTHORIZED : HttpStatus.FORBIDDEN);
response.getHeaders()
.setContentType(MediaType.TEXT_PLAIN);
final var dataBufferFactory = response.bufferFactory();
final var buffer = dataBufferFactory.wrap(ex.getMessage()
.getBytes(Charset.defaultCharset()));
return response.writeWith(Mono.just(buffer))
.doOnError(error -> DataBufferUtils.release(buffer));
})));
// @formatter:off
http.authorizeExchange(req -> req
.pathMatchers("/secured-route").hasRole("AUTHORIZED_PERSONNEL").anyExchange()
.authenticated());
// @formatter:on
return http.build();
}
static interface ReactiveJwtAuthoritiesConverter extends Converter<Jwt, Flux<GrantedAuthority>> {
}
@Bean
ReactiveJwtAuthoritiesConverter realmRoles2AuthoritiesConverter() {
return (Jwt jwt) -> {
final var realmRoles = Optional.of(jwt.getClaimAsMap("realm_access"))
.orElse(Map.of());
@SuppressWarnings("unchecked")
final var roles = (List<String>) realmRoles.getOrDefault("roles", List.of());
return Flux.fromStream(roles.stream())
.map(SimpleGrantedAuthority::new)
.map(GrantedAuthority.class::cast);
};
}
@Bean
ReactiveJwtAuthenticationConverter authenticationConverter(Converter<Jwt, Flux<GrantedAuthority>> authoritiesConverter) {
final var authenticationConverter = new ReactiveJwtAuthenticationConverter();
authenticationConverter.setPrincipalClaimName(StandardClaimNames.PREFERRED_USERNAME);
authenticationConverter.setJwtGrantedAuthoritiesConverter(authoritiesConverter);
return authenticationConverter;
}
}
@Service
public static class MessageService {
public Mono<String> greet() {
return ReactiveSecurityContextHolder.getContext()
.map(ctx -> {
final var who = (JwtAuthenticationToken) ctx.getAuthentication();
return "Hello %s! You are granted with %s.".formatted(who.getName(), who.getAuthorities());
})
.switchIfEmpty(Mono.error(new AuthenticationCredentialsNotFoundException("Security context is empty")));
}
@PreAuthorize("hasRole('AUTHORIZED_PERSONNEL')")
public Mono<String> getSecret() {
return Mono.just("Only authorized personnel can read that");
}
}
@RestController
@RequiredArgsConstructor
public static class GreetingController {
private final MessageService messageService;
@GetMapping("/greet")
public Mono<ResponseEntity<String>> greet() {
return messageService.greet()
.map(ResponseEntity::ok);
}
@GetMapping("/secured-route")
public Mono<ResponseEntity<String>> securedRoute() {
return messageService.getSecret()
.map(ResponseEntity::ok);
}
@GetMapping("/secured-method")
@PreAuthorize("hasRole('AUTHORIZED_PERSONNEL')")
public Mono<ResponseEntity<String>> securedMethod() {
return messageService.getSecret()
.map(ResponseEntity::ok);
}
}
}