Provide links for actuators at / when using a separate management port

See gh-17418

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/jersey/JerseyWebEndpointManagementContextConfiguration.java

@@ -26,6 +26,7 @@ import org.glassfish.jersey.server.ResourceConfig;
 
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointProperties;
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration;
+import org.springframework.boot.actuate.autoconfigure.web.server.ManagementPortType;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.web.EndpointLinksResolver;
@@ -42,6 +43,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
 import org.springframework.boot.autoconfigure.jersey.ResourceConfigCustomizer;
 import org.springframework.context.annotation.Bean;
+import org.springframework.core.env.Environment;
 
 /**
  * {@link ManagementContextConfiguration @ManagementContextConfiguration} for Jersey
@@ -62,14 +64,16 @@ class JerseyWebEndpointManagementContextConfiguration {
 	@Bean
 	ResourceConfigCustomizer webEndpointRegistrar(WebEndpointsSupplier webEndpointsSupplier,
 			ServletEndpointsSupplier servletEndpointsSupplier, EndpointMediaTypes endpointMediaTypes,
-			WebEndpointProperties webEndpointProperties) {
+			WebEndpointProperties webEndpointProperties, Environment environment) {
 		List<ExposableEndpoint<?>> allEndpoints = new ArrayList<>();
 		allEndpoints.addAll(webEndpointsSupplier.getEndpoints());
 		allEndpoints.addAll(servletEndpointsSupplier.getEndpoints());
 		return (resourceConfig) -> {
 			JerseyEndpointResourceFactory resourceFactory = new JerseyEndpointResourceFactory();
 			String basePath = webEndpointProperties.getBasePath();
-			EndpointMapping endpointMapping = new EndpointMapping(basePath);
+			ManagementPortType type = ManagementPortType.get(environment);
+			Boolean samePort = type == ManagementPortType.SAME;
+			EndpointMapping endpointMapping = new EndpointMapping(basePath, samePort);
 			Collection<ExposableWebEndpoint> webEndpoints = Collections
 					.unmodifiableCollection(webEndpointsSupplier.getEndpoints());
 			resourceConfig.registerResources(new HashSet<>(resourceFactory.createEndpointResources(endpointMapping,

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/reactive/WebFluxEndpointManagementContextConfiguration.java

@@ -23,6 +23,7 @@ import java.util.List;
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.CorsEndpointProperties;
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointProperties;
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration;
+import org.springframework.boot.actuate.autoconfigure.web.server.ManagementPortType;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.web.EndpointLinksResolver;
@@ -40,6 +41,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
+import org.springframework.core.env.Environment;
 import org.springframework.http.server.reactive.HttpHandler;
 import org.springframework.web.reactive.DispatcherHandler;
 
@@ -62,8 +64,11 @@ public class WebFluxEndpointManagementContextConfiguration {
 	@ConditionalOnMissingBean
 	public WebFluxEndpointHandlerMapping webEndpointReactiveHandlerMapping(WebEndpointsSupplier webEndpointsSupplier,
 			ControllerEndpointsSupplier controllerEndpointsSupplier, EndpointMediaTypes endpointMediaTypes,
-			CorsEndpointProperties corsProperties, WebEndpointProperties webEndpointProperties) {
-		EndpointMapping endpointMapping = new EndpointMapping(webEndpointProperties.getBasePath());
+			CorsEndpointProperties corsProperties, WebEndpointProperties webEndpointProperties,
+			Environment environment) {
+		ManagementPortType type = ManagementPortType.get(environment);
+		Boolean samePort = type == ManagementPortType.SAME;
+		EndpointMapping endpointMapping = new EndpointMapping(webEndpointProperties.getBasePath(), samePort);
 		Collection<ExposableWebEndpoint> endpoints = webEndpointsSupplier.getEndpoints();
 		List<ExposableEndpoint<?>> allEndpoints = new ArrayList<>();
 		allEndpoints.addAll(endpoints);

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/servlet/WebMvcEndpointManagementContextConfiguration.java

@@ -23,6 +23,7 @@ import java.util.List;
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.CorsEndpointProperties;
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointProperties;
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration;
+import org.springframework.boot.actuate.autoconfigure.web.server.ManagementPortType;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.web.EndpointLinksResolver;
@@ -41,6 +42,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
+import org.springframework.core.env.Environment;
 import org.springframework.web.servlet.DispatcherServlet;
 
 /**
@@ -63,13 +65,15 @@ public class WebMvcEndpointManagementContextConfiguration {
 	public WebMvcEndpointHandlerMapping webEndpointServletHandlerMapping(WebEndpointsSupplier webEndpointsSupplier,
 			ServletEndpointsSupplier servletEndpointsSupplier, ControllerEndpointsSupplier controllerEndpointsSupplier,
 			EndpointMediaTypes endpointMediaTypes, CorsEndpointProperties corsProperties,
-			WebEndpointProperties webEndpointProperties) {
+			WebEndpointProperties webEndpointProperties, Environment environment) {
 		List<ExposableEndpoint<?>> allEndpoints = new ArrayList<>();
 		Collection<ExposableWebEndpoint> webEndpoints = webEndpointsSupplier.getEndpoints();
 		allEndpoints.addAll(webEndpoints);
 		allEndpoints.addAll(servletEndpointsSupplier.getEndpoints());
 		allEndpoints.addAll(controllerEndpointsSupplier.getEndpoints());
-		EndpointMapping endpointMapping = new EndpointMapping(webEndpointProperties.getBasePath());
+		ManagementPortType type = ManagementPortType.get(environment);
+		Boolean samePort = type == ManagementPortType.SAME;
+		EndpointMapping endpointMapping = new EndpointMapping(webEndpointProperties.getBasePath(), samePort);
 		return new WebMvcEndpointHandlerMapping(endpointMapping, webEndpoints, endpointMediaTypes,
 				corsProperties.toCorsConfiguration(),
 				new EndpointLinksResolver(allEndpoints, webEndpointProperties.getBasePath()));

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/EndpointMapping.java

@@ -28,12 +28,20 @@ public class EndpointMapping {
 
 	private final String path;
 
+	private final Boolean samePort;
+
 	/**
 	 * Creates a new {@code EndpointMapping} using the given {@code path}.
 	 * @param path the path
+	 * @param samePort states true or false for same port as server
 	 */
-	public EndpointMapping(String path) {
+	public EndpointMapping(String path, Boolean samePort) {
 		this.path = normalizePath(path);
+		this.samePort = samePort;
+	}
+
+	public EndpointMapping(String path) {
+		this(path, true);
 	}
 
 	/**
@@ -44,6 +52,10 @@ public class EndpointMapping {
 		return this.path;
 	}
 
+	public boolean isSamePort() {
+		return this.samePort;
+	}
+
 	public String createSubPath(String path) {
 		return this.path + normalizePath(path);
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/jersey/JerseyEndpointResourceFactory.java

@@ -79,7 +79,7 @@ public class JerseyEndpointResourceFactory {
 		List<Resource> resources = new ArrayList<>();
 		endpoints.stream().flatMap((endpoint) -> endpoint.getOperations().stream())
 				.map((operation) -> createResource(endpointMapping, operation)).forEach(resources::add);
-		if (StringUtils.hasText(endpointMapping.getPath())) {
+		if (StringUtils.hasText(endpointMapping.getPath()) || !endpointMapping.isSamePort()) {
 			Resource resource = createEndpointLinksResource(endpointMapping.getPath(), endpointMediaTypes,
 					linksResolver);
 			resources.add(resource);

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/reactive/AbstractWebFluxEndpointHandlerMapping.java

@@ -120,7 +120,7 @@ public abstract class AbstractWebFluxEndpointHandlerMapping extends RequestMappi
 				registerMappingForOperation(endpoint, operation);
 			}
 		}
-		if (StringUtils.hasText(this.endpointMapping.getPath())) {
+		if (StringUtils.hasText(this.endpointMapping.getPath()) || !this.endpointMapping.isSamePort()) {
 			registerLinksMapping();
 		}
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/servlet/AbstractWebMvcEndpointHandlerMapping.java

@@ -123,7 +123,7 @@ public abstract class AbstractWebMvcEndpointHandlerMapping extends RequestMappin
 				registerMappingForOperation(endpoint, operation);
 			}
 		}
-		if (StringUtils.hasText(this.endpointMapping.getPath())) {
+		if (StringUtils.hasText(this.endpointMapping.getPath()) || !this.endpointMapping.isSamePort()) {
 			registerLinksMapping();
 		}
 	}

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/EndpointMappingTests.java

@@ -77,4 +77,9 @@ class EndpointMappingTests {
 		assertThat(new EndpointMapping("/test").createSubPath("one/")).isEqualTo("/test/one");
 	}
 
+	@Test
+	void setDifferentPort() {
+		assertThat(new EndpointMapping("/test", false).isSamePort()).isFalse();
+	}
+
 }

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-actuator/src/test/java/smoketest/actuator/ManagementDifferentPortSampleActuatorApplicationTests.java

@@ -0,0 +1,37 @@
+package smoketest.actuator;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
+		properties = { "management.endpoints.web.base-path=/","management.server.port=0"})
+public class ManagementDifferentPortSampleActuatorApplicationTests {
+
+	@LocalServerPort
+	private int port;
+
+	@LocalManagementPort
+	private int managementPort;
+
+	@Test
+	void testDifferentServerPort(){
+		if(this.managementPort != this.port) {
+			ResponseEntity<String> entity = new TestRestTemplate("user", getPassword())
+					.getForEntity("http://localhost:" + this.managementPort + "/", String.class);
+			assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+			assertThat(entity.getBody()).contains("\"_links\"");
+		}
+	}
+
+	private String getPassword(){
+		return "password";
+	}
+
+}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-jersey/src/test/java/smoketest/jersey/JerseyDifferentPortSampleActuatorApplicationTests.java

@@ -0,0 +1,35 @@
+package smoketest.jersey;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, properties = {"management.server.port=0","management.endpoints.web.base-path=/"})
+public class JerseyDifferentPortSampleActuatorApplicationTests {
+
+	@LocalManagementPort
+	private int managementPort;
+
+	@LocalServerPort
+	private int port;
+
+	@Test
+	void testDifferentServerPort(){
+		if(this.managementPort != this.port) {
+			ResponseEntity<String> entity = new TestRestTemplate("user", getPassword())
+					.getForEntity("http://localhost:" + this.managementPort + "/", String.class);
+			assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+			assertThat(entity.getBody()).contains("\"_links\"");
+		}
+	}
+
+	private String getPassword(){
+		return "password";
+	}
+}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-webflux/src/test/java/smoketest/webflux/WebFluxDifferentPortSampleActuatorApplicationTests.java

@@ -0,0 +1,35 @@
+package smoketest.webflux;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, properties = {"management.server.port=0","management.endpoints.web.base-path=/"})
+public class WebFluxDifferentPortSampleActuatorApplicationTests {
+
+	@LocalManagementPort
+	private int managementPort;
+
+	@LocalServerPort
+	private int port;
+
+	@Test
+	void testDifferentServerPort(){
+		if(this.managementPort != this.port) {
+			ResponseEntity<String> entity = new TestRestTemplate("user", getPassword())
+					.getForEntity("http://localhost:" + this.managementPort + "/", String.class);
+			assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+			assertThat(entity.getBody()).contains("\"_links\"");
+		}
+	}
+
+	private String getPassword(){
+		return "password";
+	}
+}