[feat/5] 아이디 중복확인 API 구현

src/main/java/com/umc/dream/controller/UserController.java

@@ -33,4 +33,11 @@ public ApiResponse<UserResponseDTO.LoginResultDTO> login(@RequestBody UserReques
         User user = userService.login(request);
         return ApiResponse.onSuccess(UserConverter.toLoginResultDTO(user));
     }
+
+    @Operation(summary = "아이디 중복확인 API", description = "중복이면 true, 중복이 아니면 false를 반환합니다.")
+    @PostMapping("/check-account")
+    public ApiResponse<UserResponseDTO.CheckAccountResultDTO> checkAccount(@RequestBody UserRequestDTO.CheckAccountRequestDto request){
+        boolean isDuplicated = userService.CheckAccount(request);
+        return ApiResponse.onSuccess(UserConverter.toCheckAccountResultDTO(isDuplicated));
+    }
 }

src/main/java/com/umc/dream/converter/UserConverter.java

@@ -21,6 +21,10 @@ public static UserResponseDTO.LoginResultDTO toLoginResultDTO(User user) {
                 .build();
     }
 
+    public static UserResponseDTO.CheckAccountResultDTO toCheckAccountResultDTO(boolean isDuplicated) {
+        return new UserResponseDTO.CheckAccountResultDTO(isDuplicated);
+    }
+
     public static User toUser(UserRequestDTO.JoinDto joinDto) {
         return User.builder()
                 .name(joinDto.getName())

src/main/java/com/umc/dream/dto/UserRequestDTO.java

@@ -25,4 +25,10 @@ public static class LoginDto {
         @NotNull
         String password;
     }
+
+    @Getter
+    public static class CheckAccountRequestDto {
+        @NotNull
+        String account;
+    }
 }

src/main/java/com/umc/dream/dto/UserResponseDTO.java

@@ -25,4 +25,12 @@ public static class JoinResultDTO{
     public static class LoginResultDTO {
         Long userId;
     }
+
+    @Builder
+    @Getter
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class CheckAccountResultDTO {
+        boolean isDuplicated;
+    }
 }

src/main/java/com/umc/dream/service/UserService/UserService.java

@@ -7,4 +7,6 @@ public interface UserService {
     User join(UserRequestDTO.JoinDto request);
 
     User login(UserRequestDTO.LoginDto request);
+
+    boolean CheckAccount(UserRequestDTO.CheckAccountRequestDto request);
 }

src/main/java/com/umc/dream/service/UserService/UserServiceImpl.java

@@ -9,6 +9,8 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
+import java.util.Optional;
+
 @Service
 @RequiredArgsConstructor
 public class UserServiceImpl implements UserService {
@@ -37,4 +39,15 @@ public User login(UserRequestDTO.LoginDto request) {
         }
     }
 
+    @Override
+    public boolean CheckAccount(UserRequestDTO.CheckAccountRequestDto request) {
+        Optional<User> user = userRepository.findByAccount(request.getAccount());
+
+        if (user.isPresent()) {    // 아이디 중복
+            return true;
+        } else {  // 아이디 중복x
+            return false;
+        }
+    }
+
 }