Update HandlerMappingIntrospector Usage in CORS support

Closes spring-projectsgh-16501

Signed-off-by: Evgeniy Cheban <[email protected]>

Author: evgeniycheban

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

@@ -24,6 +24,7 @@
 import org.springframework.util.ClassUtils;
 import org.springframework.web.cors.CorsConfiguration;
 import org.springframework.web.cors.CorsConfigurationSource;
+import org.springframework.web.cors.PreFlightRequestHandler;
 import org.springframework.web.filter.CorsFilter;
 import org.springframework.web.servlet.handler.HandlerMappingIntrospector;
 
@@ -107,15 +108,14 @@ static class MvcCorsFilter {
 		 * @return
 		 */
 		private static CorsFilter getMvcCorsFilter(ApplicationContext context) {
-			if (!context.containsBean(HANDLER_MAPPING_INTROSPECTOR_BEAN_NAME)) {
-				throw new NoSuchBeanDefinitionException(HANDLER_MAPPING_INTROSPECTOR_BEAN_NAME, "A Bean named "
-						+ HANDLER_MAPPING_INTROSPECTOR_BEAN_NAME + " of type "
-						+ HandlerMappingIntrospector.class.getName()
-						+ " is required to use MvcRequestMatcher. Please ensure Spring Security & Spring MVC are configured in a shared ApplicationContext.");
+			if (context.getBeanNamesForType(CorsConfigurationSource.class).length > 0) {
+				CorsConfigurationSource corsConfigurationSource = context
+					.getBean(HANDLER_MAPPING_INTROSPECTOR_BEAN_NAME, CorsConfigurationSource.class);
+				return new CorsFilter(corsConfigurationSource);
 			}
-			HandlerMappingIntrospector mappingIntrospector = context.getBean(HANDLER_MAPPING_INTROSPECTOR_BEAN_NAME,
-					HandlerMappingIntrospector.class);
-			return new CorsFilter(mappingIntrospector);
+			throw new NoSuchBeanDefinitionException(CorsConfigurationSource.class,
+					"Failed to find a bean that implements `CorsConfigurationSource`. Please ensure that you are using "
+							+ "`@EnableWebMvc`, are publishing a `WebMvcConfigurer`, or are publishing a `CorsConfigurationSource` bean.");
 		}
 
 	}

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

@@ -70,7 +70,8 @@ public void configureWhenNoMvcThenException() {
 		assertThatExceptionOfType(BeanCreationException.class)
 			.isThrownBy(() -> this.spring.register(DefaultCorsConfig.class).autowire())
 			.withMessageContaining(
-					"Please ensure Spring Security & Spring MVC are configured in a shared ApplicationContext");
+					"Please ensure that you are using `@EnableWebMvc`, are publishing a `WebMvcConfigurer`, "
+							+ "or are publishing a `CorsConfigurationSource` bean.");
 	}
 
 	@Test