Allow devtools properties in `user.home`

Support loading a `.spring-boot-devtools.properties` file from the
users home folder. The property file can be used to customize settings
that make sense on a per-user basis, but might not want to be checked
into the project.

Fixes gh-3151

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/DevToolHomePropertiesPostProcessor.java

@@ -0,0 +1,85 @@
+/*
+ * 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.devtools.autoconfigure;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Properties;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.context.EnvironmentAware;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.Environment;
+import org.springframework.core.env.PropertiesPropertySource;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.core.io.support.PropertiesLoaderUtils;
+import org.springframework.util.StringUtils;
+
+/**
+ * {@link BeanFactoryPostProcessor} to add devtools properties from the users home folder.
+ *
+ * @author Phillip Webb
+ * @since 1.3.0
+ */
+public class DevToolHomePropertiesPostProcessor implements BeanFactoryPostProcessor,
+		EnvironmentAware {
+
+	private static final String FILE_NAME = ".spring-boot-devtools.properties";
+
+	private Environment environment;
+
+	@Override
+	public void setEnvironment(Environment environment) {
+		this.environment = environment;
+	}
+
+	@Override
+	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
+			throws BeansException {
+		if (this.environment instanceof ConfigurableEnvironment) {
+			try {
+				postProcessEnvironment((ConfigurableEnvironment) this.environment);
+			}
+			catch (IOException ex) {
+				throw new IllegalStateException("Unable to load " + FILE_NAME, ex);
+			}
+		}
+	}
+
+	private void postProcessEnvironment(ConfigurableEnvironment environment)
+			throws IOException {
+		File home = getHomeFolder();
+		File propertyFile = (home == null ? null : new File(home, FILE_NAME));
+		if (propertyFile != null && propertyFile.exists() && propertyFile.isFile()) {
+			FileSystemResource resource = new FileSystemResource(propertyFile);
+			Properties properties = PropertiesLoaderUtils.loadProperties(resource);
+			environment.getPropertySources().addFirst(
+					new PropertiesPropertySource("devtools-local", properties));
+		}
+	}
+
+	protected File getHomeFolder() {
+		String home = System.getProperty("user.home");
+		if (StringUtils.hasLength(home)) {
+			return new File(home);
+		}
+		return null;
+	}
+
+}

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/LocalDevToolsAutoConfiguration.java

@@ -58,6 +58,11 @@ public class LocalDevToolsAutoConfiguration {
 		return new DevToolsPropertyDefaultsPostProcessor();
 	}
 
+	@Bean
+	public static DevToolHomePropertiesPostProcessor devToolHomePropertiesPostProcessor() {
+		return new DevToolHomePropertiesPostProcessor();
+	}
+
 	/**
 	 * Local LiveReload configuration.
 	 */

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/remote/client/RemoteClientConfiguration.java

@@ -33,6 +33,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.devtools.autoconfigure.DevToolHomePropertiesPostProcessor;
 import org.springframework.boot.devtools.autoconfigure.DevToolsProperties;
 import org.springframework.boot.devtools.autoconfigure.DevToolsProperties.Restart;
 import org.springframework.boot.devtools.autoconfigure.OptionalLiveReloadServer;
@@ -86,6 +87,11 @@ public class RemoteClientConfiguration {
 		return new PropertySourcesPlaceholderConfigurer();
 	}
 
+	@Bean
+	public static DevToolHomePropertiesPostProcessor devToolHomePropertiesPostProcessor() {
+		return new DevToolHomePropertiesPostProcessor();
+	}
+
 	@Bean
 	public ClientHttpRequestFactory clientHttpRequestFactory() {
 		List<ClientHttpRequestInterceptor> interceptors = Arrays

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/DevToolHomePropertiesPostProcessorTests.java

@@ -0,0 +1,88 @@
+/*
+ * 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.devtools.autoconfigure;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Properties;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.core.env.Environment;
+import org.springframework.mock.env.MockEnvironment;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.nullValue;
+import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link DevToolHomePropertiesPostProcessor}.
+ *
+ * @author Phillip Webb
+ */
+public class DevToolHomePropertiesPostProcessorTests {
+
+	@Rule
+	public TemporaryFolder temp = new TemporaryFolder();
+
+	private File home;
+
+	@Before
+	public void setup() throws IOException {
+		this.home = this.temp.newFolder();
+	}
+
+	@Test
+	public void loadsHomeProperties() throws Exception {
+		Properties properties = new Properties();
+		properties.put("abc", "def");
+		OutputStream out = new FileOutputStream(new File(this.home,
+				".spring-boot-devtools.properties"));
+		properties.store(out, null);
+		out.close();
+		Environment environment = new MockEnvironment();
+		MockDevToolHomePropertiesPostProcessor postProcessor = new MockDevToolHomePropertiesPostProcessor();
+		postProcessor.setEnvironment(environment);
+		postProcessor.postProcessBeanFactory(mock(ConfigurableListableBeanFactory.class));
+		assertThat(environment.getProperty("abc"), equalTo("def"));
+	}
+
+	@Test
+	public void ignoresMissingHomeProperties() throws Exception {
+		Environment environment = new MockEnvironment();
+		MockDevToolHomePropertiesPostProcessor postProcessor = new MockDevToolHomePropertiesPostProcessor();
+		postProcessor.setEnvironment(environment);
+		postProcessor.postProcessBeanFactory(mock(ConfigurableListableBeanFactory.class));
+		assertThat(environment.getProperty("abc"), nullValue());
+	}
+
+	private class MockDevToolHomePropertiesPostProcessor extends
+			DevToolHomePropertiesPostProcessor {
+
+		@Override
+		protected File getHomeFolder() {
+			return DevToolHomePropertiesPostProcessorTests.this.home;
+		}
+	}
+
+}

spring-boot-samples/spring-boot-sample-devtools/src/main/java/demo/SampleDevToolsApplication.java

@@ -26,4 +26,5 @@ public class SampleDevToolsApplication extends WebMvcAutoConfigurationAdapter {
 	public static void main(String[] args) {
 		SpringApplication.run(SampleDevToolsApplication.class, args);
 	}
+
 }