[Refactor] JWT auth filter

auto/clean

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+
+export SPRING_PROFILES_ACTIVE=test
+./gradlew clean

auto/test

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+
+export SPRING_PROFILES_ACTIVE=test
+./gradlew test

build.gradle.kts

@@ -17,7 +17,9 @@ group = "org.nkcoder"
 version = "0.1.0"
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_21
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
 }
 
 repositories {
@@ -174,6 +176,14 @@ sourceSets {
     }
 }
 
+tasks.test {
+    maxParallelForks = Runtime.getRuntime().availableProcessors()
+    failFast = true
+
+    // Cache and incremental test execution
+    outputs.cacheIf { true }
+}
+
 // Test coverage: jacoco
 jacoco {
     toolVersion = "0.8.14"

gradle.properties

@@ -0,0 +1,12 @@
+# gradle.properties
+org.gradle.daemon=true
+org.gradle.parallel=true
+org.gradle.configureondemand=true
+org.gradle.caching=true
+# Configuration cache (ensure plugins/tasks support it)
+org.gradle.configuration-cache=true
+# Better memory for large projects
+org.gradle.jvmargs=-Xmx2g -XX:+UseG1GC -Dfile.encoding=UTF-8
+# Kotlin incremental compilation
+kotlin.incremental=true
+kotlin.compiler.execution.strategy=daemon

src/main/java/org/nkcoder/security/JwtAuthenticationEntryPoint.java

@@ -1,10 +1,11 @@
 package org.nkcoder.security;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
-import jakarta.servlet.ServletException;
+import io.jsonwebtoken.ExpiredJwtException;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
+import org.apache.logging.log4j.util.Strings;
 import org.nkcoder.dto.common.ApiResponse;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -18,6 +19,8 @@ public class JwtAuthenticationEntryPoint implements AuthenticationEntryPoint {
 
   private static final Logger logger = LoggerFactory.getLogger(JwtAuthenticationEntryPoint.class);
 
+  private static final String CONTENT_TYPE_JSON = "application/json";
+
   private final ObjectMapper objectMapper;
 
   @Autowired
@@ -30,18 +33,30 @@ public void commence(
       HttpServletRequest request,
       HttpServletResponse response,
       AuthenticationException authException)
-      throws IOException, ServletException {
+      throws IOException {
 
-    logger.error("Unauthorized error: {}", authException.getMessage());
+    logger.debug("Unauthorized access attempt to: {}", request.getRequestURI());
 
-    response.setContentType("application/json");
+    response.setContentType(CONTENT_TYPE_JSON);
     response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
 
-    ApiResponse<Object> apiResponse =
-        ApiResponse.error("Unauthorized: " + authException.getMessage());
+    String errorMessage = determineErrorMessage(authException);
+    ApiResponse<Void> apiResponse = ApiResponse.error(errorMessage);
 
     objectMapper.writeValue(response.getOutputStream(), apiResponse);
     response.getOutputStream().flush();
-    response.getOutputStream().close();
+    // Do NOT close the stream - let the servlet container manage it
+  }
+
+  private String determineErrorMessage(AuthenticationException authException) {
+    if (authException.getCause() instanceof ExpiredJwtException) {
+      return "Token has expired";
+    }
+
+    if (Strings.isNotBlank(authException.getMessage())) {
+      return "Authentication required: " + authException.getMessage();
+    }
+
+    return "Authentication required";
   }
 }

src/main/java/org/nkcoder/security/JwtAuthenticationFilter.java

@@ -1,13 +1,16 @@
 package org.nkcoder.security;
 
 import io.jsonwebtoken.Claims;
-import io.jsonwebtoken.JwtException;
+import io.jsonwebtoken.ExpiredJwtException;
+import io.jsonwebtoken.MalformedJwtException;
+import io.jsonwebtoken.UnsupportedJwtException;
 import jakarta.servlet.FilterChain;
 import jakarta.servlet.ServletException;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.util.List;
+import java.util.Optional;
 import java.util.UUID;
 import org.jetbrains.annotations.NotNull;
 import org.nkcoder.enums.Role;
@@ -29,6 +32,12 @@
 @Component
 public class JwtAuthenticationFilter extends OncePerRequestFilter {
 
+  private static final String AUTHORIZATION_HEADER = "Authorization";
+  private static final String BEARER_PREFIX = "Bearer ";
+  private static final String ATTRIBUTE_USER_ID = "userId";
+  private static final String ATTRIBUTE_ROLE = "role";
+  private static final String ATTRIBUTE_EMAIL = "email";
+
   private static final Logger logger = LoggerFactory.getLogger(JwtAuthenticationFilter.class);
 
   private final JwtUtil jwtUtil;
@@ -46,48 +55,56 @@ protected void doFilterInternal(
       throws ServletException, IOException {
     logger.debug("Processing authentication for request: {}", request.getRequestURI());
 
-    try {
-      String jwt = getJwtFromRequest(request);
-
-      if (StringUtils.hasText(jwt) && !jwtUtil.isTokenExpired(jwt)) {
-        Claims claims = jwtUtil.validateAccessToken(jwt);
-
-        UUID userId = UUID.fromString(claims.getSubject());
-        String email = claims.get("email", String.class);
-        String roleString = claims.get("role", String.class);
-        Role role = Role.valueOf(roleString);
-
-        // Create authorities
-        List<GrantedAuthority> authorities =
-            List.of(new SimpleGrantedAuthority("ROLE_" + role.name()));
-
-        UserDetails userDetails = new User(email, "", authorities);
-        UsernamePasswordAuthenticationToken authentication =
-            new UsernamePasswordAuthenticationToken(userDetails, null, authorities);
-
-        authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
-
-        // Set custom attributes
-        request.setAttribute("userId", userId);
-        request.setAttribute("email", email);
-        request.setAttribute("role", role);
-
-        SecurityContextHolder.getContext().setAuthentication(authentication);
-
-        logger.debug("Set authentication for user: {}", email);
-      }
-    } catch (JwtException e) {
-      logger.error("Cannot set user authentication: {}", e.getMessage());
-    }
+    extractTokenFromRequest(request)
+        .ifPresent(
+            token -> {
+              try {
+                Claims claims = jwtUtil.validateAccessToken(token);
+
+                UUID userId = UUID.fromString(claims.getSubject());
+                String email = claims.get("email", String.class);
+                String roleString = claims.get("role", String.class);
+                Role role = Role.valueOf(roleString);
+
+                // Create authorities
+                List<GrantedAuthority> authorities =
+                    List.of(new SimpleGrantedAuthority("ROLE_" + role.name()));
+
+                UserDetails userDetails = new User(email, "", authorities);
+                UsernamePasswordAuthenticationToken authentication =
+                    new UsernamePasswordAuthenticationToken(userDetails, null, authorities);
+
+                authentication.setDetails(
+                    new WebAuthenticationDetailsSource().buildDetails(request));
+
+                // Set custom attributes
+                request.setAttribute(ATTRIBUTE_USER_ID, userId);
+                request.setAttribute(ATTRIBUTE_EMAIL, email);
+                request.setAttribute(ATTRIBUTE_ROLE, role);
+
+                SecurityContextHolder.getContext().setAuthentication(authentication);
+
+                logger.debug("Set authentication for userId: {}", userId);
+              } catch (ExpiredJwtException e) {
+                logger.error("JWT token expired: {}", e.getMessage());
+              } catch (MalformedJwtException e) {
+                logger.error("Malformed JWT token: {}", e.getMessage());
+              } catch (UnsupportedJwtException e) {
+                logger.error("Unsupported JWT token: {}", e.getMessage());
+              } catch (SecurityException e) {
+                logger.error("JWT signature validation failed: {}", e.getMessage());
+              } catch (IllegalArgumentException e) {
+                logger.error("JWT token compact of handler are invalid: {}", e.getMessage());
+              }
+            });
 
     filterChain.doFilter(request, response);
   }
 
-  private String getJwtFromRequest(HttpServletRequest request) {
-    String bearerToken = request.getHeader("Authorization");
-    if (StringUtils.hasText(bearerToken) && bearerToken.startsWith("Bearer ")) {
-      return bearerToken.substring(7);
-    }
-    return null;
+  private Optional<String> extractTokenFromRequest(HttpServletRequest request) {
+    return Optional.ofNullable(request.getHeader(AUTHORIZATION_HEADER))
+        .filter(StringUtils::hasText)
+        .filter(token -> token.startsWith(BEARER_PREFIX))
+        .map(token -> token.substring(BEARER_PREFIX.length()));
   }
 }