#140 [FEAT] 결제하기 api: 결제 금액 검증 로직 추가

server/src/main/java/org/tattour/server/domain/order/facade/impl/OrderFacadeImpl.java

@@ -14,6 +14,7 @@
 import org.tattour.server.domain.order.facade.dto.request.UpdateOrderStatusReq;
 import org.tattour.server.domain.order.facade.dto.response.ReadOrderHistoryListRes;
 import org.tattour.server.domain.order.facade.dto.response.ReadUserOrderHistoryListRes;
+import org.tattour.server.domain.order.model.OrderAmount;
 import org.tattour.server.domain.order.model.OrderHistory;
 import org.tattour.server.domain.order.model.OrderStatus;
 import org.tattour.server.domain.order.model.OrderedProduct;
@@ -88,13 +89,18 @@ private StickerOrderInfo getCartStickersOrderInfo(List<Cart> carts) {
     @Override
     @Transactional
     public void order(PurchaseRequest purchaseRequest, CreateOrderReq orderReq) {
-        // todo: totalAmount 비교하고 다름 감지 로직 추가하기 (vo OrderAmount)
         User user = userProvider.readUserById(orderReq.getUserId());
+        StickerOrderInfo stickerOrderInfo = getStickerOrderInfo(user, purchaseRequest);
+        OrderAmount orderAmount = OrderAmount.calculate(
+                stickerOrderInfo,
+                orderReq.getTotalAmount(),
+                orderReq.getShippingFee());
+
         OrderHistory orderHistory = orderService.saveOrder(
                 OrderHistory.builder()
-                        .productAmount(orderReq.getProductAmount())
-                        .shippingFee(orderReq.getShippingFee())
-                        .totalAmount(orderReq.getTotalAmount())
+                        .productAmount(orderAmount.getProductAmount())
+                        .shippingFee(orderAmount.getShippingFee())
+                        .totalAmount(orderAmount.getTotalAmount())
                         .recipientName(orderReq.getRecipientName())
                         .contact(orderReq.getContact())
                         .mailingAddress(orderReq.getMailingAddress())
@@ -103,7 +109,6 @@ public void order(PurchaseRequest purchaseRequest, CreateOrderReq orderReq) {
                         .user(user)
                         .build());
 
-        StickerOrderInfo stickerOrderInfo = getStickerOrderInfo(user, purchaseRequest);
         List<OrderedProduct> orderedProducts = orderService.saveOrderedProducts(orderHistory,
                 stickerOrderInfo);
 

server/src/main/java/org/tattour/server/domain/order/model/OrderAmount.java

@@ -0,0 +1,39 @@
+package org.tattour.server.domain.order.model;
+
+import lombok.Getter;
+import org.tattour.server.domain.sticker.provider.vo.StickerOrderInfo;
+import org.tattour.server.global.exception.BusinessException;
+import org.tattour.server.global.exception.ErrorType;
+
+@Getter
+public class OrderAmount {
+
+    private final int productAmount;
+    private final int shippingFee;
+    private final int totalAmount;
+
+    private OrderAmount(StickerOrderInfo stickerOrderInfo, int requestTotalAmount,
+            int shippingFee) {
+        int totalAmount = stickerOrderInfo.calculateTotalAmount(shippingFee);
+        validate(requestTotalAmount, totalAmount);
+
+        this.productAmount = stickerOrderInfo.calculateProductAmount();
+        this.shippingFee = shippingFee;
+        this.totalAmount = totalAmount;
+    }
+
+    public static OrderAmount calculate(StickerOrderInfo stickerOrderInfo, int requestTotalAmount,
+            int shippingFee) {
+        return new OrderAmount(stickerOrderInfo, requestTotalAmount, shippingFee);
+    }
+
+    private void validate(int requestTotalAmount, int totalAmount) {
+        if (isTotalAmountNotMatch(requestTotalAmount, totalAmount)) {
+            throw new BusinessException(ErrorType.ORDER_AMOUNT_NOT_MATCH_EXCEPTION);
+        }
+    }
+
+    private boolean isTotalAmountNotMatch(int requestTotalAmount, int totalAmount) {
+        return requestTotalAmount != totalAmount;
+    }
+}

server/src/main/java/org/tattour/server/domain/sticker/provider/vo/StickerOrderInfo.java

@@ -1,6 +1,7 @@
 package org.tattour.server.domain.sticker.provider.vo;
 
 import java.util.Map;
+import java.util.Objects;
 import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -9,9 +10,27 @@
 @Getter
 @AllArgsConstructor(access = AccessLevel.PRIVATE)
 public class StickerOrderInfo {
+
     private Map<Sticker, Integer> stickerOrderInfos;
 
     public static StickerOrderInfo of(Map<Sticker, Integer> stickerOrderInfo) {
         return new StickerOrderInfo(stickerOrderInfo);
     }
+
+    public int calculateProductAmount() {
+        return stickerOrderInfos
+                .entrySet()
+                .stream()
+                .mapToInt(entry -> getFinalProductPrice(entry.getKey()) * entry.getValue())
+                .sum();
+    }
+
+    private int getFinalProductPrice(Sticker sticker) {
+        return Objects.isNull(sticker.getDiscountPrice())
+                ? sticker.getPrice() : sticker.getDiscountPrice();
+    }
+
+    public int calculateTotalAmount(int shippingFee) {
+        return calculateProductAmount() + shippingFee;
+    }
 }

server/src/main/java/org/tattour/server/global/exception/ErrorType.java

@@ -13,7 +13,8 @@ public enum ErrorType {
     VALIDATION_INPUT_EXCEPTION(HttpStatus.BAD_REQUEST, "잘못된 요청입니다."),
     VALIDATION_WRONG_TYPE_EXCEPTION(HttpStatus.BAD_REQUEST, "잘못된 타입이 입력되었습니다."),
     INVALID_ARGUMENT_EXCEPTION(HttpStatus.BAD_REQUEST, "잘못된 인자가 입력되었습니다."),
-    INVALID_ORDERSHEET_ARGUMENT_EXCEPTION(HttpStatus.BAD_REQUEST, "stickerId와 count를 둘 다 제공하거나 제공하지 말아야 합니다."),
+    INVALID_ORDERSHEET_ARGUMENT_EXCEPTION(HttpStatus.BAD_REQUEST,
+            "stickerId와 count를 둘 다 제공하거나 제공하지 말아야 합니다."),
     INVALID_IMAGE_EXCEPTION(HttpStatus.BAD_REQUEST, "잘못된 이미지 파일입니다."),
     INVALID_CUSTOM_IMAGE_COUNT(HttpStatus.BAD_REQUEST, "이미지 파일이 1개 이상이어야합니다."),
     INVALID_MULTIPART_EXTENSION_EXCEPTION(HttpStatus.BAD_REQUEST, "잘못된 파일 확장자입니다."),
@@ -66,6 +67,7 @@ public enum ErrorType {
     ALREADY_EXIST_USER_EXCEPTION(HttpStatus.CONFLICT, "이미 존재하는 유저 이름입니다."),
     ALREADY_EXIST_PRODUCTLIKED_EXCEPTION(HttpStatus.CONFLICT, "이미 존재하는 좋아요한 상품입니다."),
     ALREADY_CANCELED_ORDER_HISTORY_EXCEPTION(HttpStatus.CONFLICT, "이미 취소 처리된 결제 내역입니다."),
+    ORDER_AMOUNT_NOT_MATCH_EXCEPTION(HttpStatus.CONFLICT, "주문 요청의 금액과 실제 결제 금액이 일치하지 않습니다."),
 
     /**
      * 500 INTERNAL SERVER ERROR

server/src/main/java/org/tattour/server/global/util/EntityDtoMapper.java

@@ -1,7 +1,6 @@
 package org.tattour.server.global.util;
 
 import java.util.List;
-import java.util.Objects;
 import java.util.stream.Collectors;
 import org.mapstruct.IterableMapping;
 import org.mapstruct.Mapping;
@@ -17,7 +16,6 @@
 import org.tattour.server.domain.order.provider.vo.OrderAmountDetailRes;
 import org.tattour.server.domain.order.provider.vo.OrderHistoryInfo;
 import org.tattour.server.domain.order.provider.vo.UserOrderHistoryInfo;
-import org.tattour.server.domain.sticker.model.Sticker;
 import org.tattour.server.domain.sticker.provider.vo.StickerLikedInfo;
 import org.tattour.server.domain.sticker.provider.vo.StickerOrderInfo;
 import org.tattour.server.domain.user.model.ProductLiked;
@@ -82,26 +80,14 @@ default List<OrderSheetStickerRes> toOrderSheetStickerRes(StickerOrderInfo stick
                 .collect(Collectors.toList());
     }
 
-    default OrderAmountDetailRes toOrderAmountRes(StickerOrderInfo stickerOrderInfo, int shippingFee) {
-        int productAmount = stickerOrderInfo.getStickerOrderInfos()
-                .entrySet()
-                .stream()
-                .mapToInt(entry -> calculateProductAmount(entry.getKey(), entry.getValue()))
-                .sum();
-        int totalAmount = calculateTotalAmount(productAmount, shippingFee);
+    default OrderAmountDetailRes toOrderAmountRes(StickerOrderInfo stickerOrderInfo,
+            int shippingFee) {
+        int productAmount = stickerOrderInfo.calculateProductAmount();
+        int totalAmount = stickerOrderInfo.calculateTotalAmount(shippingFee);
 
         return OrderAmountDetailRes.of(totalAmount, productAmount, shippingFee);
     }
 
-    private int calculateProductAmount(Sticker sticker, int count) {
-        int price = Objects.isNull(sticker.getDiscountPrice()) ? sticker.getPrice() : sticker.getDiscountPrice();
-        return price * count;
-    }
-
-    private int calculateTotalAmount(int productAmount, int shippingFee) {
-        return productAmount + shippingFee;
-    }
-
 
     // Custom
     CreateCustomSummaryRes toCustomApplySummaryInfo(Custom custom);