Disable DevTools property defaults in production

Update `DevToolsPropertyDefaultsPostProcessor` so that property defaults
are only added at development time. Properties are now added only when
`Restarter` is initialize or remote devtools is enabled.

Fixes spring-projectsgh-7014

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/env/DevToolsPropertyDefaultsPostProcessor.java

@@ -21,10 +21,13 @@
 import java.util.Map;
 
 import org.springframework.boot.SpringApplication;
+import org.springframework.boot.bind.RelaxedPropertyResolver;
+import org.springframework.boot.devtools.restart.Restarter;
 import org.springframework.boot.env.EnvironmentPostProcessor;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
 import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.Environment;
 import org.springframework.core.env.MapPropertySource;
 import org.springframework.core.env.PropertySource;
 
@@ -59,7 +62,7 @@ public class DevToolsPropertyDefaultsPostProcessor implements EnvironmentPostPro
 	@Override
 	public void postProcessEnvironment(ConfigurableEnvironment environment,
 			SpringApplication application) {
-		if (isLocalApplication(environment)) {
+		if (isLocalApplication(environment) && canAddProperties(environment)) {
 			PropertySource<?> propertySource = new MapPropertySource("refresh",
 					PROPERTIES);
 			environment.getPropertySources().addLast(propertySource);
@@ -70,4 +73,24 @@ private boolean isLocalApplication(ConfigurableEnvironment environment) {
 		return environment.getPropertySources().get("remoteUrl") == null;
 	}
 
+	private boolean canAddProperties(Environment environment) {
+		return isRestarterInitialized() || isRemoteRestartEnabled(environment);
+	}
+
+	private boolean isRestarterInitialized() {
+		try {
+			Restarter restarter = Restarter.getInstance();
+			return (restarter != null && restarter.getInitialUrls() != null);
+		}
+		catch (Exception ex) {
+			return false;
+		}
+	}
+
+	private boolean isRemoteRestartEnabled(Environment environment) {
+		RelaxedPropertyResolver resolver = new RelaxedPropertyResolver(environment,
+				"spring.devtools.remote.");
+		return resolver.containsProperty("secret");
+	}
+
 }

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/env/DevToolPropertiesIntegrationTests.java

@@ -16,11 +16,20 @@
 
 package org.springframework.boot.devtools.env;
 
+import java.net.URL;
+import java.util.Collections;
+
 import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
 
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.devtools.restart.RestartInitializer;
+import org.springframework.boot.devtools.restart.Restarter;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -32,13 +41,22 @@
  */
 public class DevToolPropertiesIntegrationTests {
 
+	@Rule
+	public ExpectedException thrown = ExpectedException.none();
+
 	private ConfigurableApplicationContext context;
 
+	@Before
+	public void setup() {
+		Restarter.initialize(new String[] {}, false, new MockInitializer(), false);
+	}
+
 	@After
 	public void cleanup() {
 		if (this.context != null) {
 			this.context.close();
 		}
+		Restarter.clearInstance();
 	}
 
 	@Test
@@ -59,6 +77,33 @@ public void beanMethodPropertyConditionIsAffectedByDevToolProperties() {
 		this.context.getBean(MyBean.class);
 	}
 
+	@Test
+	public void postProcessWhenRestarterDisabledAndRemoteSecretNotSetShouldNotAddPropertySource()
+			throws Exception {
+		Restarter.clearInstance();
+		Restarter.disable();
+		SpringApplication application = new SpringApplication(
+				BeanConditionConfiguration.class);
+		application.setWebEnvironment(false);
+		this.context = application.run();
+		this.thrown.expect(NoSuchBeanDefinitionException.class);
+		this.context.getBean(MyBean.class);
+	}
+
+	@Test
+	public void postProcessWhenRestarterDisabledAndRemoteSecretSetShouldAddPropertySource()
+			throws Exception {
+		Restarter.clearInstance();
+		Restarter.disable();
+		SpringApplication application = new SpringApplication(
+				BeanConditionConfiguration.class);
+		application.setWebEnvironment(false);
+		application.setDefaultProperties(Collections.<String, Object>singletonMap(
+				"spring.devtools.remote.secret", "donttell"));
+		this.context = application.run();
+		this.context.getBean(MyBean.class);
+	}
+
 	@Configuration
 	@ConditionalOnProperty("spring.h2.console.enabled")
 	static class ClassConditionConfiguration {
@@ -79,4 +124,12 @@ static class MyBean {
 
 	}
 
+	static class MockInitializer implements RestartInitializer {
+
+		@Override
+		public URL[] getInitialUrls(Thread thread) {
+			return new URL[] {};
+		}
+
+	}
 }