아이계정 아이디 중복 체크 기능 추가

src/main/java/com/project/growfit/domain/auth/controller/AuthChildController.java

@@ -1,8 +1,9 @@
 package com.project.growfit.domain.auth.controller;
 
+import com.project.growfit.domain.User.dto.response.ChildInfoResponseDto;
+import com.project.growfit.domain.auth.dto.request.AuthChildRegisterRequestDto;
 import com.project.growfit.domain.auth.dto.request.AuthChildRequestDto;
 import com.project.growfit.domain.auth.dto.request.FindChildPasswordRequestDto;
-import com.project.growfit.domain.User.dto.response.ChildInfoResponseDto;
 import com.project.growfit.domain.auth.dto.response.ChildResponseDto;
 import com.project.growfit.domain.auth.service.AuthChildService;
 import com.project.growfit.global.response.ResultCode;
@@ -36,7 +37,7 @@ public ResultResponse<ChildResponseDto> registerChildByCode(@NotBlank @RequestPa
     @Operation(summary = "아이 회원가입 시 아이디 & 비밀번호 & 닉네임 등록")
     @PostMapping("/register/{child_id}/credentials")
     public ResultResponse<ChildInfoResponseDto> registerChildCredentials(@PathVariable Long child_id,
-                                                                         @Valid @RequestBody AuthChildRequestDto request) {
+                                                                         @Valid @RequestBody AuthChildRegisterRequestDto request) {
         ChildInfoResponseDto dto = authChildService.registerChildCredentials(child_id, request);
 
         return ResultResponse.of(ResultCode.INFO_REGISTRATION_SUCCESS, dto);
@@ -58,6 +59,12 @@ public ResultResponse<ChildResponseDto> logoutChild(HttpServletResponse response
         return ResultResponse.of(ResultCode.LOGOUT_SUCCESS, dto);
     }
 
+    @GetMapping("/check-id")
+    public ResultResponse<String> checkDuplicateLoginId(@RequestParam String loginId) {
+        String result = authChildService.isLoginIdDuplicate(loginId);
+        return ResultResponse.of(ResultCode.DUPLICATE_SUCCESS, result);
+    }
+
     @Operation(summary = "아이 인증코드로 ID 찾기")
     @GetMapping("/find/id")
     public ResultResponse<ChildResponseDto> findChildIdByCode(

src/main/java/com/project/growfit/domain/auth/dto/request/AuthChildRegisterRequestDto.java

@@ -0,0 +1,25 @@
+package com.project.growfit.domain.auth.dto.request;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.*;
+
+public record AuthChildRegisterRequestDto(
+        @Schema(description = "아이 로그인 ID", example = "child123")
+        @NotBlank(message = "아이디를 입력해주세요.")
+        @Size(min = 4, max = 20, message = "아이디는 4자 이상 20자 이하로 입력해주세요.")
+        String childId,
+
+        @Schema(description = "아이 로그인 비밀번호", example = "password123")
+        @NotBlank(message = "비밀번호를 입력해주세요.")
+        @Pattern(
+                regexp = "^(?=.*[a-z])(?=.*\\d)[a-z\\d@$!%*?&]{8,}$",
+                message = "비밀번호는 소문자와 숫자를 포함하여 8자 이상이어야 합니다."
+        )
+        String childPassword,
+
+        @Schema(description = "닉네임 입력", example = "민준콩")
+        @NotBlank(message = "닉네임을 입력해주세요.")
+        @Size(min = 2, message = "닉네임은 2자 이상이어야 합니다.")
+        String nickname
+) {
+}

src/main/java/com/project/growfit/domain/auth/dto/request/AuthChildRequestDto.java

@@ -1,10 +1,11 @@
 package com.project.growfit.domain.auth.dto.request;
 
 import io.swagger.v3.oas.annotations.media.Schema;
-import jakarta.validation.constraints.*;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
 
 public record AuthChildRequestDto(
-
         @Schema(description = "아이 로그인 ID", example = "child123")
         @NotBlank(message = "아이디를 입력해주세요.")
         @Size(min = 4, max = 20, message = "아이디는 4자 이상 20자 이하로 입력해주세요.")
@@ -14,13 +15,7 @@ public record AuthChildRequestDto(
         @NotBlank(message = "비밀번호를 입력해주세요.")
         @Pattern(
                 regexp = "^(?=.*[a-z])(?=.*\\d)[a-z\\d@$!%*?&]{8,}$",
-                message = "비밀번호는 소문자와 숫자를 포함하여 8자 이상이어야 합니다."
-        )
-        String childPassword,
-
-        @Schema(description = "닉네임 입력", example = "민준콩")
-        @NotBlank(message = "닉네임을 입력해주세요.")
-        @Size(min = 2, message = "닉네임은 2자 이상이어야 합니다.")
-        String nickname
+                message = "비밀번호는 소문자와 숫자를 포함하여 8자 이상이어야 합니다.")
+        String childPassword
 ) {
-}
+}

src/main/java/com/project/growfit/domain/auth/service/AuthChildService.java

@@ -1,5 +1,6 @@
 package com.project.growfit.domain.auth.service;
 
+import com.project.growfit.domain.auth.dto.request.AuthChildRegisterRequestDto;
 import com.project.growfit.domain.auth.dto.request.AuthChildRequestDto;
 import com.project.growfit.domain.auth.dto.request.FindChildPasswordRequestDto;
 import com.project.growfit.domain.User.dto.response.ChildInfoResponseDto;
@@ -8,9 +9,10 @@
 
 public interface AuthChildService {
     ChildResponseDto findByCode(String code);
-    ChildInfoResponseDto registerChildCredentials(Long child_id, AuthChildRequestDto request);
+    ChildInfoResponseDto registerChildCredentials(Long child_id, AuthChildRegisterRequestDto request);
     ChildResponseDto login(AuthChildRequestDto request, HttpServletResponse response);
     ChildResponseDto logout(HttpServletResponse response);
     ChildResponseDto findChildID(String code);
     ChildInfoResponseDto findChildPassword(FindChildPasswordRequestDto request);
+    String isLoginIdDuplicate(String loginId);
 }

src/main/java/com/project/growfit/domain/auth/service/impl/AuthChildServiceImpl.java

@@ -1,5 +1,6 @@
 package com.project.growfit.domain.auth.service.impl;
 
+import com.project.growfit.domain.auth.dto.request.AuthChildRegisterRequestDto;
 import com.project.growfit.domain.auth.dto.request.AuthChildRequestDto;
 import com.project.growfit.domain.auth.dto.request.FindChildPasswordRequestDto;
 import com.project.growfit.domain.User.dto.response.ChildInfoResponseDto;
@@ -46,11 +47,9 @@ public ChildResponseDto findByCode(String code) {
 
     @Override
     @Transactional
-    public ChildInfoResponseDto registerChildCredentials(Long child_id, AuthChildRequestDto request) {
+    public ChildInfoResponseDto registerChildCredentials(Long child_id, AuthChildRegisterRequestDto request) {
         log.debug("[registerChildCredentials] 아이 계정 정보 등록 요청: child_id={}, child_login_id={}", child_id, request.childId());
-        if (childRepository.existsByLoginId(request.childId())) {
-            throw new BusinessException(ErrorCode.CHILD_ALREADY_EXISTS);
-        }
+        if (childRepository.existsByLoginId(request.childId())) throw new BusinessException(ErrorCode.DUPLICATED_ID);
         validatePasswordStrength(request.childPassword());
         Child child = getChild(child_id);
 
@@ -134,6 +133,13 @@ public ChildInfoResponseDto findChildPassword(FindChildPasswordRequestDto reques
         return ChildInfoResponseDto.toDto(child);
     }
 
+    @Override
+    @Transactional
+    public String isLoginIdDuplicate(String loginId) {
+        boolean isLoginDuplicate = childRepository.existsByLoginId(loginId);
+        return isLoginDuplicate ? "이미 사용 중인 아이디입니다." : "사용 가능한 아이디입니다.";
+    }
+
     private Child getChild(Long child_id) {
         return childRepository.findById(child_id)
                 .orElseThrow(() -> new BusinessException(ErrorCode.CHILD_NOT_FOUND));

src/main/java/com/project/growfit/global/response/ResultCode.java

@@ -20,6 +20,7 @@ public enum ResultCode {
 
     INFO_SUCCESS(HttpStatus.OK,  "성공적으로 정보가 조회되었습니다."),
     UPDATE_SUCCESS(HttpStatus.OK,  "성공적으로 정보가 수정되었습니다."),
+    DUPLICATE_SUCCESS(HttpStatus.OK, "성공적으로 중복여부를 조회하였습니다."),
 
     //Diet
     STICKER_MARK_SUCCESS(HttpStatus.OK, "스티커가 성공적으로 등록되었습니다."),

src/test/java/com/project/growfit/domain/auth/service/impl/AuthChildServiceImplTest.java

@@ -1,12 +1,13 @@
 package com.project.growfit.domain.auth.service.impl;
 
-import com.project.growfit.domain.auth.dto.request.AuthChildRequestDto;
-import com.project.growfit.domain.auth.dto.request.FindChildPasswordRequestDto;
 import com.project.growfit.domain.User.dto.response.ChildInfoResponseDto;
-import com.project.growfit.domain.auth.dto.response.ChildResponseDto;
 import com.project.growfit.domain.User.entity.Child;
 import com.project.growfit.domain.User.entity.ROLE;
 import com.project.growfit.domain.User.repository.ChildRepository;
+import com.project.growfit.domain.auth.dto.request.AuthChildRegisterRequestDto;
+import com.project.growfit.domain.auth.dto.request.AuthChildRequestDto;
+import com.project.growfit.domain.auth.dto.request.FindChildPasswordRequestDto;
+import com.project.growfit.domain.auth.dto.response.ChildResponseDto;
 import com.project.growfit.global.auth.cookie.CookieService;
 import com.project.growfit.global.auth.jwt.JwtProvider;
 import com.project.growfit.global.auth.service.AuthenticatedUserProvider;
@@ -109,7 +110,7 @@ void setUp() {
     void 아이_계졍을_성공적으로_등록한다() {
         // Given
         Long childId = 1L;
-        AuthChildRequestDto request = new AuthChildRequestDto(loginId, password, nickname);
+        AuthChildRegisterRequestDto request = new AuthChildRegisterRequestDto(loginId, password, nickname);
         when(childRepository.findById(childId)).thenReturn(Optional.of(mockChild));
         when(passwordEncoder.encode(request.childPassword())).thenReturn("encodedPassword");
 
@@ -126,7 +127,7 @@ void setUp() {
     void 아이_정보가_없는_경우_아이_등록에_실패한다() {
         // Given
         Long childId = 999L;
-        AuthChildRequestDto request = new AuthChildRequestDto(loginId, password, nickname);
+        AuthChildRegisterRequestDto  request = new  AuthChildRegisterRequestDto (loginId, password,  nickname);
         when(childRepository.findById(childId)).thenReturn(Optional.empty());
 
         // When & Then
@@ -175,7 +176,7 @@ void setUp() {
     @DisplayName("[login 성공 테스트] 아이 로그인 성공")
     void 아이_로그인에_성공한다() {
         // Given
-        AuthChildRequestDto request = new AuthChildRequestDto(loginId, password, nickname);
+        AuthChildRequestDto request = new AuthChildRequestDto(loginId, password);
         Child mockChild = new Child(loginId, nickname, password, ROLE.ROLE_CHILD);
 
         Authentication mockAuthentication = mock(Authentication.class);