Merge pull request #41278 from Chu3laMan

* pr/41278:
  Polish "Publish an AuditEvent on logout"
  Publish an AuditEvent on logout

Closes gh-41278

Author: mhalbritter

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/security/AuthenticationAuditListener.java

@@ -24,6 +24,7 @@
 import org.springframework.security.authentication.event.AbstractAuthenticationEvent;
 import org.springframework.security.authentication.event.AbstractAuthenticationFailureEvent;
 import org.springframework.security.authentication.event.AuthenticationSuccessEvent;
+import org.springframework.security.authentication.event.LogoutSuccessEvent;
 import org.springframework.security.web.authentication.switchuser.AuthenticationSwitchUserEvent;
 import org.springframework.util.ClassUtils;
 
@@ -51,6 +52,13 @@ public class AuthenticationAuditListener extends AbstractAuthenticationAuditList
 	 */
 	public static final String AUTHENTICATION_SWITCH = "AUTHENTICATION_SWITCH";
 
+	/**
+	 * Logout success event type.
+	 *
+	 * @since 3.4.0
+	 */
+	public static final String LOGOUT_SUCCESS = "LOGOUT_SUCCESS";
+
 	private static final String WEB_LISTENER_CHECK_CLASS = "org.springframework.security.web.authentication.switchuser.AuthenticationSwitchUserEvent";
 
 	private final WebAuditListener webListener = maybeCreateWebListener();
@@ -73,6 +81,9 @@ else if (this.webListener != null && this.webListener.accepts(event)) {
 		else if (event instanceof AuthenticationSuccessEvent successEvent) {
 			onAuthenticationSuccessEvent(successEvent);
 		}
+		else if (event instanceof LogoutSuccessEvent logoutSuccessEvent) {
+			onLogoutSuccessEvent(logoutSuccessEvent);
+		}
 	}
 
 	private void onAuthenticationFailureEvent(AbstractAuthenticationFailureEvent event) {
@@ -93,6 +104,14 @@ private void onAuthenticationSuccessEvent(AuthenticationSuccessEvent event) {
 		publish(new AuditEvent(event.getAuthentication().getName(), AUTHENTICATION_SUCCESS, data));
 	}
 
+	private void onLogoutSuccessEvent(LogoutSuccessEvent event) {
+		Map<String, Object> data = new LinkedHashMap<>();
+		if (event.getAuthentication().getDetails() != null) {
+			data.put("details", event.getAuthentication().getDetails());
+		}
+		publish(new AuditEvent(event.getAuthentication().getName(), LOGOUT_SUCCESS, data));
+	}
+
 	private static final class WebAuditListener {
 
 		void process(AuthenticationAuditListener listener, AbstractAuthenticationEvent input) {

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/security/AuthenticationAuditListenerTests.java

@@ -29,6 +29,7 @@
 import org.springframework.security.authentication.event.AuthenticationFailureExpiredEvent;
 import org.springframework.security.authentication.event.AuthenticationSuccessEvent;
 import org.springframework.security.authentication.event.InteractiveAuthenticationSuccessEvent;
+import org.springframework.security.authentication.event.LogoutSuccessEvent;
 import org.springframework.security.core.authority.AuthorityUtils;
 import org.springframework.security.core.userdetails.User;
 import org.springframework.security.web.authentication.switchuser.AuthenticationSwitchUserEvent;
@@ -60,6 +61,13 @@ void testAuthenticationSuccess() {
 		assertThat(event.getAuditEvent().getType()).isEqualTo(AuthenticationAuditListener.AUTHENTICATION_SUCCESS);
 	}
 
+	@Test
+	void testLogoutSuccess() {
+		AuditApplicationEvent event = handleAuthenticationEvent(
+				new LogoutSuccessEvent(new UsernamePasswordAuthenticationToken("user", "password")));
+		assertThat(event.getAuditEvent().getType()).isEqualTo(AuthenticationAuditListener.LOGOUT_SUCCESS);
+	}
+
 	@Test
 	void testOtherAuthenticationSuccess() {
 		this.listener.onApplicationEvent(new InteractiveAuthenticationSuccessEvent(