Remove FederatedIdentityConfigurer from demo sample

Issue gh-1208

Author: jgrandja

Diff for: docs/src/docs/asciidoc/guides/how-to-social-login.adoc

@@ -123,7 +123,6 @@ Select from the following use cases to see an example of each:
 
 * I want to <<advanced-use-cases-capture-users>>
 * I want to <<advanced-use-cases-map-claims>>
-* I want to <<advanced-use-cases-configurer>>
 
 [[advanced-use-cases-capture-users]]
 === Capture Users in a Database
@@ -166,37 +165,3 @@ public OAuth2TokenCustomizer<JwtEncodingContext> idTokenCustomizer() {
     return new FederatedIdentityIdTokenCustomizer();
 }
 ----
-
-[[advanced-use-cases-configurer]]
-=== Create My Own Configurer
-
-The following example `SecurityConfigurer` combines configuration for all of the above examples into a single reusable component:
-
-.`FederatedIdentityConfigurer`
-[source,java]
-----
-include::{samples-dir}/demo-authorizationserver/src/main/java/sample/federation/FederatedIdentityConfigurer.java[tags=imports;class]
-----
-
-The configurer can be applied using the Spring Security DSL as in the following example:
-
-.Apply Configurer
-[source,java]
-----
-http.apply(new FederatedIdentityConfigurer());
-----
-
-The configurer also has its own DSL to customize the defaults.
-Here's a full example:
-
-.Customize using Configurer
-[source,java]
-----
-http.apply(new FederatedIdentityConfigurer())
-	.oauth2UserHandler((oauth2User) -> {
-		// TODO: Handle login of an OAuth2 user...
-	})
-	.oidcUserHandler((oidcUser) -> {
-		// TODO: Handle login of an OIDC user...
-	});
-----

Diff for: samples/demo-authorizationserver/src/main/java/sample/config/AuthorizationServerConfig.java

@@ -22,9 +22,8 @@
 import com.nimbusds.jose.jwk.source.JWKSource;
 import com.nimbusds.jose.proc.SecurityContext;
 import sample.authentication.DeviceClientAuthenticationProvider;
-import sample.jose.Jwks;
-import sample.federation.FederatedIdentityConfigurer;
 import sample.federation.FederatedIdentityIdTokenCustomizer;
+import sample.jose.Jwks;
 import sample.web.authentication.DeviceClientAuthenticationConverter;
 
 import org.springframework.context.annotation.Bean;
@@ -121,8 +120,7 @@ public SecurityFilterChain authorizationServerSecurityFilterChain(
 				exceptions.authenticationEntryPoint(new LoginUrlAuthenticationEntryPoint("/login"))
 			)
 			.oauth2ResourceServer(oauth2ResourceServer ->
-				oauth2ResourceServer.jwt(Customizer.withDefaults()))
-			.apply(new FederatedIdentityConfigurer());
+				oauth2ResourceServer.jwt(Customizer.withDefaults()));
 		// @formatter:on
 		return http.build();
 	}

Diff for: samples/demo-authorizationserver/src/main/java/sample/config/DefaultSecurityConfig.java

@@ -15,6 +15,8 @@
  */
 package sample.config;
 
+import sample.federation.FederatedIdentityAuthenticationSuccessHandler;
+
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
@@ -26,6 +28,7 @@
 import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.provisioning.InMemoryUserDetailsManager;
 import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
 import org.springframework.security.web.session.HttpSessionEventPublisher;
 
 /**
@@ -47,13 +50,23 @@ public SecurityFilterChain defaultSecurityFilterChain(HttpSecurity http) throws
 					.anyRequest().authenticated()
 			)
 			.formLogin(formLogin ->
-				formLogin.loginPage("/login")
+				formLogin
+					.loginPage("/login")
+			)
+			.oauth2Login(oauth2Login ->
+				oauth2Login
+					.loginPage("/login")
+					.successHandler(authenticationSuccessHandler())
 			);
 
 		return http.build();
 	}
 	// @formatter:on
 
+	private AuthenticationSuccessHandler authenticationSuccessHandler() {
+		return new FederatedIdentityAuthenticationSuccessHandler();
+	}
+
 	// @formatter:off
 	@Bean
 	public UserDetailsService users() {