리다이렉트 경로 상수화 및 중복 제거

- "redirect:/", "redirect:/login?reason=auth" 상수로 치환
- 중복된 문자열 정의 제거 및 가독성 개선

src/main/java/com/eactive/apim/portal/common/exception/PortalGlobalExceptionHandler.java

@@ -37,23 +37,27 @@ import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 @RequiredArgsConstructor
 public class PortalGlobalExceptionHandler {
 
+    private static final String REDIRECT_PREFIX = "redirect:";
+    private static final String REDIRECT_HOME = REDIRECT_PREFIX + "/";
+    private static final String REDIRECT_LOGIN_AUTH = REDIRECT_PREFIX + "/login?reason=auth";
+
     private final Logger log = LoggerFactory.getLogger(getClass());
     private final PortalProperties portalProperties;
     private final Environment environment;
 
     @ExceptionHandler(value = NotFoundException.class)
     public ModelAndView handleINotFoundException(HttpServletRequest request, NotFoundException ex) {
-        return new ModelAndView("redirect:/");
+        return new ModelAndView(REDIRECT_HOME);
     }
 
     @ExceptionHandler(value = MethodArgumentTypeMismatchException.class)
     public ModelAndView handleMethodArgumentTypeMismatchException(HttpServletRequest request, MethodArgumentTypeMismatchException ex) {
-        return new ModelAndView("redirect:/");
+        return new ModelAndView(REDIRECT_HOME);
     }
 
     @ExceptionHandler(value = UserNotLoginException.class)
     public ModelAndView handleUserNotLoginException(HttpServletRequest request, UserNotLoginException ex) {
-        return new ModelAndView("redirect:/login?reason=auth");
+        return new ModelAndView(REDIRECT_LOGIN_AUTH);
     }
 
     @ExceptionHandler(value = AccessDeniedException.class)
@@ -62,7 +66,7 @@ public class PortalGlobalExceptionHandler {
         if (!SecurityUtil.isAuthenticated()) {
             // 원래 요청 페이지를 세션에 저장 → 로그인+2FA 완료 후 LoginFinalizer 가 복귀시킨다.
             savePostLoginRedirect(request);
-            return new ModelAndView("redirect:/login?reason=auth");
+            return new ModelAndView(REDIRECT_LOGIN_AUTH);
         }
         log.warn("접근 권한 없음: loginId={}, uri={}", StringMaskingUtil.maskLoginId(SecurityUtil.getCurrentLoginId()), request.getRequestURI());
         ModelAndView modelAndView = new ModelAndView("error");
@@ -137,7 +141,7 @@ public class PortalGlobalExceptionHandler {
         String target = ex.getRedirectPage();
         if (!isSafeRedirectTarget(target)) {
             log.warn("허용되지 않은 리다이렉트 대상 - uri={}, target={}", request.getRequestURI(), target);
-            return new ModelAndView("redirect:/");
+            return new ModelAndView(REDIRECT_HOME);
         }
         return new ModelAndView(target);
     }
@@ -148,8 +152,8 @@ public class PortalGlobalExceptionHandler {
             return false;
         }
         String path = target;
-        if (path.startsWith("redirect:")) {
-            path = path.substring("redirect:".length());
+        if (path.startsWith(REDIRECT_PREFIX)) {
+            path = path.substring(REDIRECT_PREFIX.length());
         } else if (path.startsWith("forward:")) {
             path = path.substring("forward:".length());
         }
@@ -172,7 +176,7 @@ public class PortalGlobalExceptionHandler {
     public ModelAndView handleHttpRequestMethodNotSupportedException(HttpServletRequest request, HttpRequestMethodNotSupportedException ex) {
         log.error(ex.getMessage());
         ModelAndView modelAndView = new ModelAndView();
-        modelAndView.setViewName("redirect:/");
+        modelAndView.setViewName(REDIRECT_HOME);
         return modelAndView;
     }
 
@@ -216,7 +220,7 @@ public class PortalGlobalExceptionHandler {
     public ModelAndView handleInvalidFileException(HttpServletRequest request, RedirectAttributes redirectAttributes, InvalidFileException ex) {
         ModelAndView modelAndView = new ModelAndView();
         redirectAttributes.addFlashAttribute("error", ex.getMessage());
-        modelAndView.setViewName("redirect:" + request.getRequestURI());
+        modelAndView.setViewName(REDIRECT_PREFIX + request.getRequestURI());
         return modelAndView;
     }
 
@@ -227,7 +231,7 @@ public class PortalGlobalExceptionHandler {
         String errorMessage = "파일 크기가 허용된 최대 용량(" + maxSize + ")을 초과했습니다.";
         redirectAttributes.addFlashAttribute("error", errorMessage);
         ModelAndView modelAndView = new ModelAndView();
-        modelAndView.setViewName("redirect:" + request.getRequestURI());
+        modelAndView.setViewName(REDIRECT_PREFIX + request.getRequestURI());
         return modelAndView;
     }
 }