Add auto-configuration for Jetty’s GzipFilter

Jetty’s GzipFilter is a container-agnostic Filter that can be used to
provide gzip and deflate encoding of HTTP responses. This commit adds
auto-configuration for GzipFilter that is enabled when
org.eclipse.jetty:jetty-servlets is on the classpath. The filter can
be configured using spring.http.gzip.*

See gh-2031

spring-boot-autoconfigure/pom.xml

@@ -160,6 +160,11 @@
 			<artifactId>HikariCP-java6</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.eclipse.jetty</groupId>
+			<artifactId>jetty-servlets</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.eclipse.jetty</groupId>
 			<artifactId>jetty-webapp</artifactId>

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/GzipFilterAutoConfiguration.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2012-2015 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
+ *
+ *      http://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.autoconfigure.web;
+
+import org.eclipse.jetty.servlets.GzipFilter;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.context.embedded.FilterRegistrationBean;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for {@link GzipFilter}.
+ *
+ * @author Andy Wilkinson
+ * @since 1.2.2
+ */
+@Configuration
+@ConditionalOnClass(GzipFilter.class)
+@EnableConfigurationProperties(GzipFilterProperties.class)
+public class GzipFilterAutoConfiguration {
+
+	@Autowired
+	private GzipFilterProperties properties;
+
+	@Bean
+	public FilterRegistrationBean gzipFilter() {
+		FilterRegistrationBean registration = new FilterRegistrationBean(new GzipFilter());
+		registration.addUrlPatterns("/*");
+		registration.setInitParameters(this.properties.getAsInitParameters());
+
+		return registration;
+	}
+
+}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/GzipFilterProperties.java

@@ -0,0 +1,226 @@
+/*
+ * Copyright 2012-2015 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
+ *
+ *      http://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.autoconfigure.web;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.jetty.servlets.GzipFilter;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.http.HttpMethod;
+import org.springframework.util.MimeType;
+import org.springframework.util.StringUtils;
+
+/**
+ * Properties for configuring {@link GzipFilter}.
+ *
+ * @author Andy Wilkinson
+ * @since 1.2.2
+ */
+@ConfigurationProperties(prefix = "spring.http.gzip")
+public class GzipFilterProperties {
+
+	private final Map<String, String> initParameters = new HashMap<String, String>();
+
+	/**
+	 * Size of the output buffer in bytes.
+	 */
+	private Integer bufferSize;
+
+	/**
+	 * Minimum content length required for compression to occur.
+	 */
+	private Integer minGzipSize;
+
+	/**
+	 * The level used for deflate compression (0-9).
+	 */
+	private Integer deflateCompressionLevel;
+
+	/**
+	 * noWrap setting for deflate compression.
+	 */
+	private Boolean deflateNoWrap;
+
+	/**
+	 * Comma-separated list of HTTP methods for which compression is enabled.
+	 */
+	private List<HttpMethod> methods;
+
+	/**
+	 * Comma-separated list of MIME types which should be compressed.
+	 */
+	private List<MimeType> mimeTypes;
+
+	/**
+	 * Comma-separated list of user agents to exclude from compression. String.contains is
+	 * used to determine a match against the request's User-Agent header.
+	 */
+	private String excludedAgents;
+
+	/**
+	 * Comma-separated list of regular expression patterns to control user agents excluded
+	 * from compression.
+	 */
+	private String excludedAgentPatterns;
+
+	/**
+	 * Comma-separated list of paths to exclude from compression. Uses String.startsWith
+	 * to determine a match against the request's path.
+	 */
+	private String excludedPaths;
+
+	/**
+	 * Comma-separated list of regular expression patterns to control the paths that are
+	 * excluded from compression.
+	 */
+	private String excludedPathPatterns;
+
+	/**
+	 * Vary header sent on responses that may be compressed.
+	 */
+	private String vary;
+
+	public GzipFilterProperties() {
+		this.addInitParameter("checkGzExists", false);
+	}
+
+	public Integer getBufferSize() {
+		return this.bufferSize;
+	}
+
+	public void setBufferSize(Integer bufferSize) {
+		this.addInitParameter("bufferSize", bufferSize);
+		this.bufferSize = bufferSize;
+	}
+
+	public Integer getMinGzipSize() {
+		return this.minGzipSize;
+	}
+
+	public void setMinGzipSize(Integer minGzipSize) {
+		this.addInitParameter("minGzipSize", minGzipSize);
+		this.minGzipSize = minGzipSize;
+	}
+
+	public Integer getDeflateCompressionLevel() {
+		return this.deflateCompressionLevel;
+	}
+
+	public void setDeflateCompressionLevel(Integer deflateCompressionLevel) {
+		this.addInitParameter("deflateCompressionLevel", deflateCompressionLevel);
+		this.deflateCompressionLevel = deflateCompressionLevel;
+	}
+
+	public Boolean getDeflateNoWrap() {
+		return this.deflateNoWrap;
+	}
+
+	public void setDeflateNoWrap(Boolean deflateNoWrap) {
+		this.addInitParameter("deflateNoWrap", deflateNoWrap);
+		this.deflateNoWrap = deflateNoWrap;
+	}
+
+	public List<HttpMethod> getMethods() {
+		return this.methods;
+	}
+
+	public void setMethods(List<HttpMethod> methods) {
+		this.addInitParameter("methods",
+				StringUtils.collectionToCommaDelimitedString(methods));
+		this.methods = methods;
+	}
+
+	public List<MimeType> getMimeTypes() {
+		return this.mimeTypes;
+	}
+
+	public void setMimeTypes(List<MimeType> mimeTypes) {
+		this.addInitParameter("mimeTypes",
+				StringUtils.collectionToCommaDelimitedString(mimeTypes));
+		this.mimeTypes = mimeTypes;
+	}
+
+	public String getExcludedAgents() {
+		return this.excludedAgents;
+	}
+
+	public void setExcludedAgents(String excludedAgents) {
+		this.addInitParameter("excludedAgents", excludedAgents);
+		this.excludedAgents = excludedAgents;
+	}
+
+	public String getExcludedAgentPatterns() {
+		return this.excludedAgentPatterns;
+	}
+
+	public void setExcludedAgentPatterns(String excludedAgentPatterns) {
+		this.addInitParameter("excludedAgentPatterns", excludedAgentPatterns);
+		this.excludedAgentPatterns = excludedAgentPatterns;
+	}
+
+	public String getExcludedPaths() {
+		return this.excludedPaths;
+	}
+
+	public void setExcludedPaths(String excludedPaths) {
+		this.addInitParameter("excludedPaths", excludedPaths);
+		this.excludedPaths = excludedPaths;
+	}
+
+	public String getExcludedPathPatterns() {
+		return this.excludedPathPatterns;
+	}
+
+	public void setExcludedPathPatterns(String excludedPathPatterns) {
+		this.addInitParameter("excludedPathPatterns", excludedPathPatterns);
+		this.excludedPathPatterns = excludedPathPatterns;
+	}
+
+	public String getVary() {
+		return this.vary;
+	}
+
+	public void setVary(String vary) {
+		this.addInitParameter("vary", vary);
+		this.vary = vary;
+	}
+
+	Map<String, String> getAsInitParameters() {
+		return this.initParameters;
+	}
+
+	private void addInitParameter(String name, Integer value) {
+		if (value != null) {
+			this.initParameters.put(name, value.toString());
+		}
+	}
+
+	private void addInitParameter(String name, Boolean value) {
+		if (value != null) {
+			this.initParameters.put(name, value.toString());
+		}
+	}
+
+	private void addInitParameter(String name, String value) {
+		if (value != null) {
+			this.initParameters.put(name, value.toString());
+		}
+	}
+
+}

spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -57,14 +57,15 @@ org.springframework.boot.autoconfigure.social.TwitterAutoConfiguration,\
 org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\
 org.springframework.boot.autoconfigure.velocity.VelocityAutoConfiguration,\
 org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
-org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration,\
 org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration,\
-org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration,\
-org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration,\
+org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration,\
+org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration,\
+org.springframework.boot.autoconfigure.web.GzipFilterAutoConfiguration,\
 org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration,\
 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration,\
+org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration,\
+org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration,\
 org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration,\
-org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration,\
 org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration
 
 # Template availability providers

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/GzipFilterAutoConfigurationTests.java

@@ -0,0 +1,112 @@
+/*
+ * Copyright 2012-2015 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
+ *
+ *      http://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.autoconfigure.web;
+
+import org.junit.After;
+import org.junit.Test;
+import org.springframework.boot.context.embedded.FilterRegistrationBean;
+import org.springframework.boot.test.EnvironmentTestUtils;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Tests for {@link GzipFilterAutoConfiguration}
+ *
+ * @author Andy Wilkinson
+ */
+public class GzipFilterAutoConfigurationTests {
+
+	private AnnotationConfigApplicationContext context;
+
+	@After
+	public void close() {
+		if (this.context != null) {
+			this.context.close();
+		}
+	}
+
+	@Test
+	public void filterIsMappedToSlashStar() {
+		createAndRefreshContext();
+		FilterRegistrationBean registrationBean = this.context.getBean("gzipFilter",
+				FilterRegistrationBean.class);
+		assertThat(registrationBean.getUrlPatterns(), contains("/*"));
+	}
+
+	@Test
+	public void byDefaultCheckGzExistsIsTheOnlyInitParameter() {
+		createAndRefreshContext();
+		FilterRegistrationBean registrationBean = this.context.getBean("gzipFilter",
+				FilterRegistrationBean.class);
+		assertThat(registrationBean.getInitParameters().size(), equalTo(1));
+		assertThat(registrationBean.getInitParameters().get("checkGzExists"),
+				equalTo("false"));
+	}
+
+	@Test
+	public void customInitParameterConfiguration() {
+		createAndRefreshContext("spring.http.gzip.bufferSize:1234",
+				"spring.http.gzip.minGzipSize:2345",
+				"spring.http.gzip.deflateCompressionLevel:5",
+				"spring.http.gzip.deflateNoWrap:false",
+				"spring.http.gzip.methods:GET,POST",
+				"spring.http.gzip.mimeTypes:application/foo,application/bar",
+				"spring.http.gzip.excludedAgents:excluded-agent-1,excluded-agent-2",
+				"spring.http.gzip.excludedAgentPatterns:agent-pattern-1,agent-pattern-2",
+				"spring.http.gzip.excludedPaths:/static/",
+				"spring.http.gzip.excludedPathPatterns:path-pattern",
+				"spring.http.gzip.vary:vary-header-value");
+		FilterRegistrationBean registrationBean = this.context.getBean("gzipFilter",
+				FilterRegistrationBean.class);
+		assertThat(registrationBean.getInitParameters().size(), equalTo(12));
+		assertThat(registrationBean.getInitParameters().get("checkGzExists"),
+				equalTo("false"));
+		assertThat(registrationBean.getInitParameters().get("bufferSize"),
+				equalTo("1234"));
+		assertThat(registrationBean.getInitParameters().get("minGzipSize"),
+				equalTo("2345"));
+		assertThat(registrationBean.getInitParameters().get("deflateCompressionLevel"),
+				equalTo("5"));
+		assertThat(registrationBean.getInitParameters().get("deflateNoWrap"),
+				equalTo("false"));
+		assertThat(registrationBean.getInitParameters().get("methods"),
+				equalTo("GET,POST"));
+		assertThat(registrationBean.getInitParameters().get("mimeTypes"),
+				equalTo("application/foo,application/bar"));
+		assertThat(registrationBean.getInitParameters().get("excludedAgents"),
+				equalTo("excluded-agent-1,excluded-agent-2"));
+		assertThat(registrationBean.getInitParameters().get("excludedAgentPatterns"),
+				equalTo("agent-pattern-1,agent-pattern-2"));
+		assertThat(registrationBean.getInitParameters().get("excludedPaths"),
+				equalTo("/static/"));
+		assertThat(registrationBean.getInitParameters().get("excludedPathPatterns"),
+				equalTo("path-pattern"));
+		assertThat(registrationBean.getInitParameters().get("vary"),
+				equalTo("vary-header-value"));
+	}
+
+	private void createAndRefreshContext(String... pairs) {
+		this.context = new AnnotationConfigApplicationContext();
+		EnvironmentTestUtils.addEnvironment(this.context, pairs);
+		this.context.register(GzipFilterAutoConfiguration.class);
+		this.context.refresh();
+	}
+
+}

spring-boot-dependencies/pom.xml

@@ -983,6 +983,11 @@
 				<artifactId>jetty-security</artifactId>
 				<version>${jetty.version}</version>
 			</dependency>
+			<dependency>
+				<groupId>org.eclipse.jetty</groupId>
+				<artifactId>jetty-server</artifactId>
+				<version>${jetty.version}</version>
+			</dependency>
 			<dependency>
 				<groupId>org.eclipse.jetty</groupId>
 				<artifactId>jetty-servlet</artifactId>
@@ -990,7 +995,7 @@
 			</dependency>
 			<dependency>
 				<groupId>org.eclipse.jetty</groupId>
-				<artifactId>jetty-server</artifactId>
+				<artifactId>jetty-servlets</artifactId>
 				<version>${jetty.version}</version>
 			</dependency>
 			<dependency>