feat: API Response와 Exception 설정

- api 공통 응답 정의
- api response code enum 정의
- Exception 설정

Author: myqewr

src/main/java/com/ftm/server/common/exception/.gitkeep

@@ -0,0 +1,21 @@
+package com.ftm.server.common.exception;
+
+import com.ftm.server.common.response.enums.ErrorResponseCode;
+import lombok.Getter;
+
+@Getter
+public class CustomException extends RuntimeException{
+
+    private final ErrorResponseCode errorResponseCode;
+
+    public CustomException(ErrorResponseCode errorResponseCode) {
+        super(errorResponseCode.getMessage()); // 예외 메시지 설정
+        this.errorResponseCode = errorResponseCode;
+    }
+
+    public static CustomException USER_NOT_FOUND =
+            new CustomException(ErrorResponseCode.USER_NOT_FOUND);
+
+    public static CustomException USER_ALREADY_EXISTS =
+            new CustomException(ErrorResponseCode.USER_ALREADY_EXISTS);
+}

src/main/java/com/ftm/server/common/exception/CustomException.java

@@ -0,0 +1,33 @@
+package com.ftm.server.common.response;
+
+import com.ftm.server.common.response.enums.ErrorResponseCode;
+import com.ftm.server.common.response.enums.SuccessResponseCode;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class ApiResponse<T> {
+
+    private final Integer status;
+    private final String code;
+    private final String message;
+    private final T data;
+
+
+    public static <T> ApiResponse<T> success(SuccessResponseCode responseCode) {
+        return success(responseCode,null);
+    }
+
+    public static <T> ApiResponse<T> success(SuccessResponseCode responseCode, T data) {
+        return new ApiResponse<>(responseCode.getHttpStatus().value(),responseCode.getCode(),responseCode.getMessage(),data);
+    }
+
+    public static <T> ApiResponse<T> fail(ErrorResponseCode responseCode) {
+        return fail(responseCode,null);
+    }
+
+    public static <T> ApiResponse<T> fail(ErrorResponseCode responseCode, T data) {
+        return new ApiResponse<>(responseCode.getHttpStatus().value(),responseCode.getCode(),responseCode.getMessage(),data);
+    }
+}

src/main/java/com/ftm/server/common/response/.gitkeep

@@ -0,0 +1,37 @@
+package com.ftm.server.common.response.enums;
+
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+public enum ErrorResponseCode {
+
+    //400번
+    INVALID_REQUEST_ARGUMENT(HttpStatus.BAD_REQUEST,"E400_001","클라이언트 요청이 잘못된 형식이거나, 필수 데이터가 누락되었습니다."),
+
+    //401번
+    NOT_AUTHENTICATED(HttpStatus.UNAUTHORIZED,"E401_001","인증되지 않은 사용자입니다."),
+
+    //403번
+    NOT_AUTHORIZATION(HttpStatus.FORBIDDEN,"E403_001","인증된 사용자이나 해당 자원에 대한 접근 권한이 없습니다."),
+
+    //404번
+    USER_NOT_FOUND(HttpStatus.NOT_FOUND,"E404_001","요청된 사용자를 찾을 수 없습니다."),
+
+    //409번
+    USER_ALREADY_EXISTS(HttpStatus.CONFLICT, "E409_001","이미 존재하는 사용자입니다."),
+    PASSWORD_NOT_MATCHED(HttpStatus.CONFLICT,"E409_002","비밀번호가 일치하지 않습니다."),
+
+    //500번
+    UNKNOWN_SERVER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR,"E500_001","알 수 없는 서버 에러가 발생했습니다.");
+
+    private final HttpStatus httpStatus;
+    private final String code;
+    private final String message;
+
+    ErrorResponseCode(HttpStatus httpStatus, String code, String message){
+        this.httpStatus = httpStatus;
+        this.code = code;
+        this.message = message;
+    }
+}

src/main/java/com/ftm/server/common/response/ApiResponse.java

@@ -0,0 +1,23 @@
+package com.ftm.server.common.response.enums;
+
+import lombok.Getter;
+import org.springframework.http.HttpStatus;
+
+@Getter
+public enum SuccessResponseCode {
+
+    OK(HttpStatus.OK, "S001", "클라이언트 요청이 정상적으로 처리됨."),
+    CREATED(HttpStatus.CREATED,"S002", "새로운 리소스가 성공적으로 생성됨."),
+    ACCEPTED(HttpStatus.ACCEPTED,"S003","요청은 수락되었지만 아직 처리가 완료되지 않음."),
+    NO_CONTENT(HttpStatus.NO_CONTENT,"S004", "요청이 성공적으로 처리되었지만, 응답 본문이 필요 없음.");
+
+    private final HttpStatus httpStatus;
+    private final String code;
+    private final String message;
+
+    SuccessResponseCode(HttpStatus httpStatus, String code, String message){
+        this.httpStatus = httpStatus;
+        this.code = code;
+        this.message = message;
+    }
+}