Add support for the @FilterRegistration annotation with @WebMvcTest

Signed-off-by: Dmytro Nosan <[email protected]>

Author: nosan

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/web/servlet/SpringBootMockMvcBuilderCustomizer.java

@@ -20,17 +20,21 @@
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
+import java.util.EnumSet;
 import java.util.List;
 
 import jakarta.servlet.Filter;
+import jakarta.servlet.annotation.WebInitParam;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.boot.web.servlet.AbstractFilterRegistrationBean;
 import org.springframework.boot.web.servlet.DelegatingFilterProxyRegistrationBean;
+import org.springframework.boot.web.servlet.FilterRegistration;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.boot.web.servlet.RegistrationBean;
 import org.springframework.boot.web.servlet.ServletContextInitializerBeans;
@@ -330,15 +334,36 @@ private static class FilterRegistrationBeans extends ServletContextInitializerBe
 
 		@Override
 		protected void addAdaptableBeans(ListableBeanFactory beanFactory) {
-			addAsRegistrationBean(beanFactory, Filter.class, new FilterRegistrationBeanAdapter());
+			addAsRegistrationBean(beanFactory, Filter.class, new FilterRegistrationBeanAdapter(beanFactory));
 		}
 
 		private static final class FilterRegistrationBeanAdapter implements RegistrationBeanAdapter<Filter> {
 
+			private final ListableBeanFactory beanFactory;
+
+			private FilterRegistrationBeanAdapter(ListableBeanFactory beanFactory) {
+				this.beanFactory = beanFactory;
+			}
+
 			@Override
 			public RegistrationBean createRegistrationBean(String name, Filter source, int totalNumberOfSourceBeans) {
 				FilterRegistrationBean<Filter> bean = new FilterRegistrationBean<>(source);
 				bean.setName(name);
+				FilterRegistration annotation = this.beanFactory.findAnnotationOnBean(name, FilterRegistration.class);
+				if (annotation != null) {
+					bean.setEnabled(annotation.enabled());
+					bean.setOrder(annotation.order());
+					if (StringUtils.hasText(annotation.name())) {
+						bean.setName(annotation.name());
+					}
+					if (annotation.dispatcherTypes().length > 0) {
+						bean.setDispatcherTypes(EnumSet.copyOf(Arrays.asList(annotation.dispatcherTypes())));
+					}
+					for (WebInitParam param : annotation.initParameters()) {
+						bean.addInitParameter(param.name(), param.value());
+					}
+					bean.setUrlPatterns(Arrays.asList(annotation.urlPatterns()));
+				}
 				return bean;
 			}
 

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/mockmvc/WebMvcTestServletFilterRegistrationIntegrationTests.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright 2012-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.test.autoconfigure.web.servlet.mockmvc;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Map;
+
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.FilterConfig;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.annotation.WebInitParam;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.security.SecurityProperties;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.boot.web.servlet.FilterRegistration;
+import org.springframework.boot.web.servlet.FilterRegistrationBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.test.web.servlet.assertj.MockMvcTester;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link FilterRegistration} and {@link FilterRegistrationBean} with
+ * {@link WebMvcTest @WebMvcTest}.
+ *
+ * @author Dmytro Nosan
+ */
+@WebMvcTest
+class WebMvcTestServletFilterRegistrationIntegrationTests {
+
+	@Autowired
+	private MockMvcTester mvc;
+
+	@Test
+	void annotation() {
+		assertThat(this.mvc.get().uri("/test-filter-annotation")).headers()
+			.hasValue("test-filter-name", "testFilterAnnotation")
+			.hasValue("test-filter-param1", "value1")
+			.hasValue("test-filter-param2", "value2");
+	}
+
+	@Test
+	void registration() {
+		assertThat(this.mvc.get().uri("/test-filter-registration")).headers()
+			.hasValue("test-filter-name", "testFilterRegistration")
+			.hasValue("test-filter-param3", "value3")
+			.hasValue("test-filter-param4", "value4");
+	}
+
+	@TestConfiguration(proxyBeanMethods = false)
+	static class FilterRegistrationConfiguration {
+
+		@Bean
+		@FilterRegistration(name = "testFilterAnnotation", urlPatterns = "/test-filter-annotation",
+				initParameters = { @WebInitParam(name = "param1", value = "value1"),
+						@WebInitParam(name = "param2", value = "value2") },
+				order = SecurityProperties.DEFAULT_FILTER_ORDER - 1)
+		TestFilter testFilterAnnotationBean() {
+			return new TestFilter();
+		}
+
+		@Bean
+		FilterRegistrationBean<TestFilter> testFilterRegistrationBean() {
+			FilterRegistrationBean<TestFilter> registration = new FilterRegistrationBean<>(new TestFilter());
+			registration.setName("testFilterRegistration");
+			registration.addUrlPatterns("/test-filter-registration");
+			registration.setInitParameters(Map.of("param3", "value3", "param4", "value4"));
+			registration.setOrder(SecurityProperties.DEFAULT_FILTER_ORDER - 1);
+			return registration;
+		}
+
+	}
+
+	private static final class TestFilter extends OncePerRequestFilter {
+
+		@Override
+		protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
+				FilterChain filterChain) throws ServletException, IOException {
+			response.addHeader("test-filter-name", getFilterName());
+			FilterConfig config = getFilterConfig();
+			if (config != null) {
+				Collections.list(config.getInitParameterNames())
+					.forEach((name) -> response.addHeader("test-filter-" + name, config.getInitParameter(name)));
+			}
+			filterChain.doFilter(request, response);
+		}
+
+	}
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/ServletContextInitializerBeans.java

@@ -330,7 +330,13 @@ private void configureFromAnnotation(ServletRegistrationBean<Servlet> bean, Serv
 	}
 
 	/**
-	 * {@link RegistrationBeanAdapter} for {@link Filter} beans.
+	 * {@link RegistrationBeanAdapter} implementation for {@link Filter} beans.
+	 * <p>
+	 * <b>NOTE:</b> A similar implementation is used in
+	 * {@code SpringBootMockMvcBuilderCustomizer} for registering
+	 * {@code @FilterRegistration} beans with {@code @MockMvc}. If you modify this class,
+	 * please also update {@code SpringBootMockMvcBuilderCustomizer} if needed.
+	 * </p>
 	 */
 	private static class FilterRegistrationBeanAdapter implements RegistrationBeanAdapter<Filter> {