[Feat/#7] 공통 API 응답 포맷 추가

api/common-api/src/main/java/kr/ac/kookmin/stream/ApiResponse.java

@@ -0,0 +1,41 @@
+package kr.ac.kookmin.stream;
+
+import kr.ac.kookmin.stream.common.BusinessException;
+import kr.ac.kookmin.stream.common.ErrorCode;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
+public final class ApiResponse<T> {
+
+    private static final String SUCCESS_CODE = "SUCCESS";
+    private static final String SUCCESS_MESSAGE = "요청에 성공했습니다.";
+
+    private final boolean success;
+    private final String code;
+    private final String message;
+    private final T data;
+
+    public static <T> ApiResponse<T> success(T data) {
+        return new ApiResponse<>(true, SUCCESS_CODE, SUCCESS_MESSAGE, data);
+    }
+
+    public static <T> ApiResponse<T> success() {
+        return success(null);
+    }
+
+    public static <T> ApiResponse<T> error(BusinessException exception) {
+        ErrorCode errorCode = exception.getErrorCode();
+        return new ApiResponse<>(false, errorCode.name(), exception.getMessage(), null);
+    }
+
+    public static <T> ApiResponse<T> error(ErrorCode errorCode) {
+        return new ApiResponse<>(false, errorCode.name(), errorCode.message(), null);
+    }
+
+    public static <T> ApiResponse<T> error(String code, String message) {
+        return new ApiResponse<>(false, code, message, null);
+    }
+}

api/common-api/src/main/java/kr/ac/kookmin/stream/CursorSliceResponse.java

@@ -0,0 +1,15 @@
+package kr.ac.kookmin.stream;
+
+import java.util.List;
+import kr.ac.kookmin.stream.common.CursorSliceResult;
+
+public record CursorSliceResponse<T>(List<T> content, boolean hasNext, Long nextCursor) {
+
+    public static <T> CursorSliceResponse<T> from(CursorSliceResult<T> result) {
+        return new CursorSliceResponse<>(
+            result.content(),
+            result.hasNext(),
+            result.nextCursor()
+        );
+    }
+}

core/common/src/main/java/kr/ac/kookmin/stream/common/CursorSliceResult.java

@@ -0,0 +1,5 @@
+package kr.ac.kookmin.stream.common;
+
+import java.util.List;
+
+public record CursorSliceResult<T>(List<T> content, boolean hasNext, Long nextCursor) {}