BAEL-7115 implementation (#15101)

* implementing BAEL-6833

* implementation for BAEL-7115

* feedback fixes

* Moving code folder as per feedback

* renaming logic class folder name

* adding more methods

---------

Co-authored-by: technoddy <mail.technoddy@gmail.com>

web-modules/javax-servlets-2/pom.xml

@@ -68,6 +68,17 @@
                 </exclusion>
             </exclusions>
         </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>${mockito.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.github.ua-parser</groupId>
+            <artifactId>uap-java</artifactId>
+            <version>${uap.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -101,6 +112,8 @@
         <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
         <jetty-maven-plugin.version>10.0.4</jetty-maven-plugin.version>
         <commons-text.version>1.10.0</commons-text.version>
+        <mockito.version>5.6.0</mockito.version>
+        <uap.version>1.5.4</uap.version>
     </properties>
 
 </project>

web-modules/javax-servlets-2/src/main/java/com/baeldung/servlets/AccountServlet.java

@@ -0,0 +1,26 @@
+package com.baeldung.servlets;
+
+import java.io.IOException;
+import java.util.Map;
+
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.*;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.baeldung.servlets.clientinfo.AccountLogic;
+
+@WebServlet(name = "AccountServlet", urlPatterns = "/account")
+public class AccountServlet extends HttpServlet {
+    public static final Logger log = LoggerFactory.getLogger(AccountServlet.class);
+
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
+        AccountLogic accountLogic = new AccountLogic();
+        Map<String, String> clientInfo = accountLogic.getClientInfo(request);
+        log.info("Request client info: {}, " + clientInfo);
+
+        response.setStatus(HttpServletResponse.SC_OK);
+    }
+}

web-modules/javax-servlets-2/src/main/java/com/baeldung/servlets/clientinfo/AccountLogic.java

@@ -0,0 +1,32 @@
+package com.baeldung.servlets.clientinfo;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.servlet.http.HttpServletRequest;
+
+import ua_parser.Client;
+import ua_parser.Parser;
+
+public class AccountLogic {
+    public Map<String, String> getClientInfo(HttpServletRequest request) {
+        String remoteAddr = request.getRemoteAddr();
+        String remoteHost = request.getRemoteHost();
+        String remoteUser = request.getRemoteUser();
+        String contentType = request.getHeader("content-type");
+        String userAgent = request.getHeader("user-agent");
+
+        Parser uaParser = new Parser();
+        Client client = uaParser.parse(userAgent);
+
+        Map<String, String> clientInfo = new HashMap<>();
+        clientInfo.put("os_family", client.os.family);
+        clientInfo.put("device_family", client.device.family);
+        clientInfo.put("userAgent_family", client.userAgent.family);
+        clientInfo.put("remote_address", remoteAddr);
+        clientInfo.put("remote_host", remoteHost);
+        clientInfo.put("remote_user", remoteUser);
+        clientInfo.put("content_type", contentType);
+        return clientInfo;
+    }
+}

web-modules/javax-servlets-2/src/test/java/com/baeldung/servlets/clientinfo/ClientInformationUnitTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.servlets.clientinfo;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.mockito.Mockito.when;
+
+import java.util.Map;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+public class ClientInformationUnitTest {
+
+    @Test
+    void givenMockHttpServletRequestWithHeaders_whenGetClientInfo_thenReturnsUserAGentInfo() {
+        HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+
+        when(request.getHeader("user-agent")).thenReturn("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.36, acceptLanguage:en-US,en;q=0.9");
+        when(request.getHeader("content-type")).thenReturn("application/json");
+        when(request.getRemoteAddr()).thenReturn("198.167.0.1");
+        when(request.getRemoteHost()).thenReturn("baeldung.com");
+        when(request.getRemoteUser()).thenReturn("baeldung");
+
+        AccountLogic accountLogic = new AccountLogic();
+        Map<String, String> clientInfo = accountLogic.getClientInfo(request);
+        assertThat(clientInfo.get("os_family")).isEqualTo("Mac OS X");
+        assertThat(clientInfo.get("device_family")).isEqualTo("Mac");
+        assertThat(clientInfo.get("userAgent_family")).isEqualTo("Chrome");
+        assertThat(clientInfo.get("content_type")).isEqualTo("application/json");
+        assertThat(clientInfo.get("remote_user")).isEqualTo("baeldung");
+        assertThat(clientInfo.get("remote_address")).isEqualTo("198.167.0.1");
+        assertThat(clientInfo.get("remote_host")).isEqualTo("baeldung.com");
+    }
+}