Make RequestMatcherDelegatingAuthorizationManager Post-Processable

Closes gh-15978

config/src/main/java/org/springframework/security/config/annotation/web/configurers/AuthorizeHttpRequestsConfigurer.java

@@ -170,7 +170,8 @@ private AuthorizationManager<HttpServletRequest> createAuthorizationManager() {
 							+ ". Try completing it with something like requestUrls().<something>.hasRole('USER')");
 			Assert.state(this.mappingCount > 0,
 					"At least one mapping is required (for example, authorizeHttpRequests().anyRequest().authenticated())");
-			RequestMatcherDelegatingAuthorizationManager manager = postProcess(this.managerBuilder.build());
+			AuthorizationManager<HttpServletRequest> manager = postProcess(
+					(AuthorizationManager<HttpServletRequest>) this.managerBuilder.build());
 			return AuthorizeHttpRequestsConfigurer.this.postProcessor.postProcess(manager);
 		}
 

config/src/test/java/org/springframework/security/config/annotation/web/configurers/AuthorizeHttpRequestsConfigurerTests.java

@@ -172,6 +172,7 @@ public void configureWhenObjectPostProcessorRegisteredThenInvokedOnAuthorization
 		ObjectPostProcessor<Object> objectPostProcessor = this.spring.getContext()
 			.getBean(ObjectPostProcessorConfig.class).objectPostProcessor;
 		verify(objectPostProcessor).postProcess(any(RequestMatcherDelegatingAuthorizationManager.class));
+		verify(objectPostProcessor).postProcess(any(AuthorizationManager.class));
 		verify(objectPostProcessor).postProcess(any(AuthorizationFilter.class));
 	}