Refactor ReactiveOAuth2ClientAutoConfiguration for non webapps

Non web applications might want to leverage
`ReactiveClientRegistrationRepository` and
`ServerOAuth2AuthorizedClientRepository` to configure `WebClient`.

Closes gh-14350

Author: mbhave

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/client/reactive/ReactiveOAuth2ClientAutoConfiguration.java

@@ -15,15 +15,32 @@
  */
 package org.springframework.boot.autoconfigure.security.oauth2.client.reactive;
 
+import java.util.ArrayList;
+import java.util.List;
+
+import reactor.core.publisher.Flux;
+
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.security.oauth2.client.ClientsConfiguredCondition;
+import org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientProperties;
+import org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2ClientPropertiesRegistrationAdapter;
 import org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.Import;
 import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
+import org.springframework.security.oauth2.client.InMemoryReactiveOAuth2AuthorizedClientService;
+import org.springframework.security.oauth2.client.ReactiveOAuth2AuthorizedClientService;
 import org.springframework.security.oauth2.client.registration.ClientRegistration;
+import org.springframework.security.oauth2.client.registration.InMemoryReactiveClientRegistrationRepository;
+import org.springframework.security.oauth2.client.registration.ReactiveClientRegistrationRepository;
+import org.springframework.security.oauth2.client.web.server.AuthenticatedPrincipalServerOAuth2AuthorizedClientRepository;
+import org.springframework.security.oauth2.client.web.server.ServerOAuth2AuthorizedClientRepository;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for Spring Security's Reactive
@@ -34,10 +51,42 @@
  */
 @Configuration
 @AutoConfigureBefore(ReactiveSecurityAutoConfiguration.class)
-@ConditionalOnClass({ EnableWebFluxSecurity.class, ClientRegistration.class })
-@ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.REACTIVE)
-@Import({ ReactiveOAuth2ClientRegistrationRepositoryConfiguration.class,
-		ReactiveOAuth2WebSecurityConfiguration.class })
+@EnableConfigurationProperties(OAuth2ClientProperties.class)
+@ConditionalOnClass({ Flux.class, EnableWebFluxSecurity.class, ClientRegistration.class })
 public class ReactiveOAuth2ClientAutoConfiguration {
 
+	private final OAuth2ClientProperties properties;
+
+	public ReactiveOAuth2ClientAutoConfiguration(OAuth2ClientProperties properties) {
+		this.properties = properties;
+	}
+
+	@Bean
+	@Conditional(ClientsConfiguredCondition.class)
+	@ConditionalOnMissingBean(ReactiveClientRegistrationRepository.class)
+	public InMemoryReactiveClientRegistrationRepository clientRegistrationRepository() {
+		List<ClientRegistration> registrations = new ArrayList<>(
+				OAuth2ClientPropertiesRegistrationAdapter
+						.getClientRegistrations(this.properties).values());
+		return new InMemoryReactiveClientRegistrationRepository(registrations);
+	}
+
+	@Bean
+	@ConditionalOnBean(ReactiveClientRegistrationRepository.class)
+	@ConditionalOnMissingBean
+	public ReactiveOAuth2AuthorizedClientService authorizedClientService(
+			ReactiveClientRegistrationRepository clientRegistrationRepository) {
+		return new InMemoryReactiveOAuth2AuthorizedClientService(
+				clientRegistrationRepository);
+	}
+
+	@Bean
+	@ConditionalOnBean(ReactiveOAuth2AuthorizedClientService.class)
+	@ConditionalOnMissingBean
+	public ServerOAuth2AuthorizedClientRepository authorizedClientRepository(
+			ReactiveOAuth2AuthorizedClientService authorizedClientService) {
+		return new AuthenticatedPrincipalServerOAuth2AuthorizedClientRepository(
+				authorizedClientService);
+	}
+
 }