OAuth2ClientWebMvcSecurityConfiguration handles multiple OAuth2AuthorizedClientService @Bean

Fixes gh-5321

config/src/main/java/org/springframework/security/config/annotation/web/configuration/OAuth2ClientConfiguration.java

@@ -57,7 +57,6 @@ final class OAuth2ClientConfiguration {
 
 	@Configuration
 	static class OAuth2ClientWebMvcSecurityConfiguration implements WebMvcConfigurer {
-		@Autowired(required = false)
 		private OAuth2AuthorizedClientService authorizedClientService;
 
 		@Override
@@ -68,5 +67,12 @@ final class OAuth2ClientConfiguration {
 				argumentResolvers.add(authorizedClientArgumentResolver);
 			}
 		}
+
+		@Autowired(required = false)
+		public void setAuthorizedClientService(List<OAuth2AuthorizedClientService> authorizedClientServices) {
+			if (authorizedClientServices.size() == 1) {
+				this.authorizedClientService = authorizedClientServices.get(0);
+			}
+		}
 	}
 }

config/src/test/java/org/springframework/security/config/annotation/web/configuration/OAuth2ClientConfigurationTests.java

@@ -17,6 +17,7 @@ package org.springframework.security.config.annotation.web.configuration;
 
 import org.junit.Rule;
 import org.junit.Test;
+import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
@@ -24,12 +25,14 @@ import org.springframework.security.config.test.SpringTestRule;
 import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
 import org.springframework.security.oauth2.client.OAuth2AuthorizedClientService;
 import org.springframework.security.oauth2.client.annotation.RegisteredOAuth2AuthorizedClient;
+import org.springframework.security.oauth2.client.registration.ClientRegistrationRepository;
 import org.springframework.security.oauth2.core.OAuth2AccessToken;
 import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.user;
@@ -92,4 +95,41 @@ public class OAuth2ClientConfigurationTests {
 			return AUTHORIZED_CLIENT_SERVICE;
 		}
 	}
+
+	// gh-5321
+	@Test
+	public void loadContextWhenOAuth2AuthorizedClientServiceRegisteredTwiceThenThrowNoUniqueBeanDefinitionException() {
+		assertThatThrownBy(() -> this.spring.register(OAuth2AuthorizedClientServiceRegisteredTwiceConfig.class).autowire())
+				.hasRootCauseInstanceOf(NoUniqueBeanDefinitionException.class)
+				.hasMessageContaining("Only one matching @Bean of type " + OAuth2AuthorizedClientService.class.getName() + " should be registered.");
+	}
+
+	@EnableWebMvc
+	@EnableWebSecurity
+	static class OAuth2AuthorizedClientServiceRegisteredTwiceConfig extends WebSecurityConfigurerAdapter {
+
+		@Override
+		protected void configure(HttpSecurity http) throws Exception {
+			http
+				.authorizeRequests()
+					.anyRequest().authenticated()
+					.and()
+				.oauth2Login();
+		}
+
+		@Bean
+		public ClientRegistrationRepository clientRegistrationRepository() {
+			return mock(ClientRegistrationRepository.class);
+		}
+
+		@Bean
+		public OAuth2AuthorizedClientService authorizedClientService1() {
+			return mock(OAuth2AuthorizedClientService.class);
+		}
+
+		@Bean
+		public OAuth2AuthorizedClientService authorizedClientService2() {
+			return mock(OAuth2AuthorizedClientService.class);
+		}
+	}
 }