From: Kai Moritz <kai@juplo.de>
Date: Fri, 7 Apr 2023 11:20:11 +0000 (+0200)
Subject: Demo: Send Status-Code in InterceptorHandler
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=9639c89ecb4d10ffd9cfd6f4889247ae1881fc3a;p=demos%2Fspring-boot

Demo: Send Status-Code in InterceptorHandler
---

diff --git a/pom.xml b/pom.xml
index 3a71f8c..b6262c5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,10 +9,11 @@
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>de.juplo.demos</groupId>
-	<artifactId>TEMPLATE</artifactId>
+	<artifactId>interceptor</artifactId>
 	<version>0.0.1-SNAPSHOT</version>
-	<name>Demo: TEMPLATE</name>
-	<description>TEMPLATE for a Demo project for Spring Boot</description>
+	<name>Status-Code-HandlerInterceptor</name>
+	<description>Demo: Send Status-Code in HandlerInterceptor</description>
+
 	<properties>
 		<java.version>17</java.version>
 	</properties>
@@ -25,6 +26,10 @@
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+		</dependency>
 
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
diff --git a/src/main/java/de/juplo/demo/BackendVersionInterceptor.java b/src/main/java/de/juplo/demo/BackendVersionInterceptor.java
new file mode 100644
index 0000000..f8a046b
--- /dev/null
+++ b/src/main/java/de/juplo/demo/BackendVersionInterceptor.java
@@ -0,0 +1,38 @@
+package de.juplo.demo;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.servlet.HandlerInterceptor;
+
+import java.io.IOException;
+
+
+@RequiredArgsConstructor
+public class BackendVersionInterceptor implements HandlerInterceptor
+{
+  public final static String BACKEND_VERSION = "X-Backend-Version";
+
+
+  private final String backendVersion;
+
+
+  @Override
+  public boolean preHandle(
+      HttpServletRequest request,
+      HttpServletResponse response,
+      Object handler) throws IOException
+  {
+    String requstedVersion = request.getHeader(BACKEND_VERSION);
+    if (requstedVersion != null && !requstedVersion.equals(backendVersion))
+    {
+      response.sendError(HttpStatus.GONE.value());
+      return false;
+    }
+    else
+    {
+      return true;
+    }
+  }
+}
diff --git a/src/main/java/de/juplo/demo/DemoApplication.java b/src/main/java/de/juplo/demo/DemoApplication.java
index 76f6fe4..2917409 100644
--- a/src/main/java/de/juplo/demo/DemoApplication.java
+++ b/src/main/java/de/juplo/demo/DemoApplication.java
@@ -1,12 +1,27 @@
 package de.juplo.demo;
 
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
 
 @SpringBootApplication
-public class DemoApplication {
+public class DemoApplication
+{
+	@Value("${build.version}")
+	String projectVersion;
+
+
+	@Bean
+	public BackendVersionInterceptor backendVersionInterceptor()
+	{
+		return new BackendVersionInterceptor(projectVersion);
+	}
+
 
-	public static void main(String[] args) {
+	public static void main(String[] args)
+	{
 		SpringApplication.run(DemoApplication.class, args);
 	}
 
diff --git a/src/main/java/de/juplo/demo/DemoWebMvcConfigurer.java b/src/main/java/de/juplo/demo/DemoWebMvcConfigurer.java
new file mode 100644
index 0000000..35fa5aa
--- /dev/null
+++ b/src/main/java/de/juplo/demo/DemoWebMvcConfigurer.java
@@ -0,0 +1,21 @@
+package de.juplo.demo;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+
+@Configuration
+public class DemoWebMvcConfigurer implements WebMvcConfigurer
+{
+  @Autowired
+  BackendVersionInterceptor backendVersionInterceptor;
+
+
+  @Override
+  public void addInterceptors(InterceptorRegistry registry)
+  {
+    registry.addInterceptor(backendVersionInterceptor);
+  }
+}
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index 8b13789..5c35098 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -1 +1,3 @@
-
+application.name=@project.artifactId@
+build.version=@project.version@
+build.timestamp=@timestamp@
diff --git a/src/test/java/de/juplo/demo/DemoApplicationTests.java b/src/test/java/de/juplo/demo/DemoApplicationTests.java
index 850debd..f2981dc 100644
--- a/src/test/java/de/juplo/demo/DemoApplicationTests.java
+++ b/src/test/java/de/juplo/demo/DemoApplicationTests.java
@@ -2,26 +2,52 @@ package de.juplo.demo;
 
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.web.servlet.MockMvc;
 
+import static de.juplo.demo.BackendVersionInterceptor.BACKEND_VERSION;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
 
 @SpringBootTest
 @AutoConfigureMockMvc
-class DemoApplicationTests {
+class DemoApplicationTests
+{
+
+	@Value("${build.version}")
+	String projectVersion;
+
 
 	@Test
-	void contextLoads() {
+	void contextLoads()
+	{
 	}
 
 
 	@Test
-	void getWelcomeResponseIsOk(@Autowired MockMvc mvc) throws Exception
+	void getWelcomeResponseIsOkIfBackendHeaderIsNotSet(@Autowired MockMvc mvc) throws Exception
 	{
 		mvc.perform(get("/")).andExpect(status().isOk());
 	}
+
+	@Test
+	void getWelcomeResponseIsOkIfBackendHeaderDoesMatch(@Autowired MockMvc mvc) throws Exception
+	{
+		mvc
+				.perform(get("/")
+						.header(BACKEND_VERSION, projectVersion))
+				.andExpect(status().isOk());
+	}
+
+	@Test
+	void getWelcomeResponseIsGoneIfBackendHeaderDoesNotMatch(@Autowired MockMvc mvc) throws Exception
+	{
+		mvc
+				.perform(get("/")
+						.header(BACKEND_VERSION, "FOO"))
+				.andExpect(status().isGone());
+	}
 }