[FEAT] 장바구니 api 구현

server/src/main/java/org/tattour/server/domain/cart/controller/CartController.java

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+package org.tattour.server.domain.cart.controller;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import io.swagger.v3.oas.annotations.security.SecurityRequirement;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import javax.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.tattour.server.domain.cart.controller.dto.request.SaveCartReq;
+import org.tattour.server.domain.cart.controller.dto.response.CartItemsRes;
+import org.tattour.server.domain.cart.facade.CartFacade;
+import org.tattour.server.global.config.annotations.UserId;
+import org.tattour.server.global.dto.BaseResponse;
+import org.tattour.server.global.dto.FailResponse;
+import org.tattour.server.global.dto.SuccessResponse;
+import org.tattour.server.global.dto.SuccessType;
+
+@RestController
+@RequestMapping("/api/v1/cart")
+@SecurityRequirement(name = "JWT Auth")
+@Tag(name = "Cart(장바구니)", description = "Cart API Document")
+@RequiredArgsConstructor
+@Validated
+public class CartController {
+    private final CartFacade cartFacade;
+
+    @Operation(summary = "장바구니 아이템 추가")
+    @ApiResponses(value = {
+            @ApiResponse(
+                    responseCode = "201",
+                    description = "생성에 성공했습니다.",
+                    content = @Content(schema = @Schema(implementation = SuccessResponse.class))),
+            @ApiResponse(
+                    responseCode = "400",
+                    description = "잘못된 요청입니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class))),
+            @ApiResponse(
+                    responseCode = "404",
+                    description = "존재하지 않는 유저입니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class))),
+            @ApiResponse(
+                    responseCode = "404",
+                    description = "존재하지 않는 스티커입니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class))),
+            @ApiResponse(
+                    responseCode = "500",
+                    description = "알 수 없는 서버 에러가 발생했습니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class)))
+    })
+    @PostMapping("/items")
+    public ResponseEntity<?> saveCartItem(
+            @Parameter(hidden = true) @UserId Integer userId,
+            @RequestBody @Valid SaveCartReq saveCartReq
+    ) {
+        cartFacade.saveCartItem(userId, saveCartReq);
+        return BaseResponse.success(SuccessType.CREATE_SUCCESS);
+    }
+
+    @Operation(summary = "유저 장바구니 목록 조회")
+    @ApiResponses(value = {
+            @ApiResponse(
+                    responseCode = "200",
+                    description = "조회에 성공했습니다.",
+                    content = @Content(schema = @Schema(implementation = CartItemsRes.class))),
+            @ApiResponse(
+                    responseCode = "400",
+                    description = "잘못된 요청입니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class))),
+            @ApiResponse(
+                    responseCode = "500",
+                    description = "알 수 없는 서버 에러가 발생했습니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class)))
+    })
+    @GetMapping("/items")
+    public ResponseEntity<?> getUserCartItem(
+            @Parameter(hidden = true) @UserId Integer userId
+    ) {
+        return BaseResponse.success(SuccessType.GET_SUCCESS, cartFacade.getUserCartItems(userId));
+    }
+
+    @Operation(summary = "장바구니 수량 1개 더하기")
+    @ApiResponses(value = {
+            @ApiResponse(
+                    responseCode = "200",
+                    description = "갱신에 성공했습니다.",
+                    content = @Content(schema = @Schema(implementation = SuccessResponse.class))),
+            @ApiResponse(
+                    responseCode = "400",
+                    description = "잘못된 요청입니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class))),
+            @ApiResponse(
+                    responseCode = "404",
+                    description = "존재하지 않는 장바구니입니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class))),
+            @ApiResponse(
+                    responseCode = "500",
+                    description = "알 수 없는 서버 에러가 발생했습니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class)))
+    })
+    @PatchMapping("/items/{cartId}")
+    public ResponseEntity<?> addCartCount(
+            @Parameter(hidden = true) @UserId Integer userId,
+            @PathVariable Integer cartId) {
+        cartFacade.increaseCartCount(userId, cartId);
+        return BaseResponse.success(SuccessType.UPDATE_SUCCESS);
+    }
+
+    @Operation(summary = "장바구니 삭제")
+    @ApiResponses(value = {
+            @ApiResponse(
+                    responseCode = "200",
+                    description = "삭제에 성공했습니다.",
+                    content = @Content(schema = @Schema(implementation = SuccessResponse.class))),
+            @ApiResponse(
+                    responseCode = "400",
+                    description = "잘못된 요청입니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class))),
+            @ApiResponse(
+                    responseCode = "404",
+                    description = "존재하지 않는 장바구니입니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class))),
+            @ApiResponse(
+                    responseCode = "500",
+                    description = "알 수 없는 서버 에러가 발생했습니다.",
+                    content = @Content(schema = @Schema(implementation = FailResponse.class)))
+    })
+    @DeleteMapping("/items/{cartId}")
+    public ResponseEntity<?> deleteCartCount(
+            @Parameter(hidden = true) @UserId Integer userId,
+            @PathVariable Integer cartId) {
+        cartFacade.deleteCartItem(userId, cartId);
+        return BaseResponse.success(SuccessType.DELETE_SUCCESS);
+    }
+}
+
+

server/src/main/java/org/tattour/server/domain/cart/controller/dto/request/SaveCartReq.java

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+package org.tattour.server.domain.cart.controller.dto.request;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+public class SaveCartReq {
+    @NotNull
+    private int stickerId;
+
+    @NotNull
+    @Min(1)
+    private int count;
+}

server/src/main/java/org/tattour/server/domain/cart/controller/dto/response/CartItemRes.java

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+package org.tattour.server.domain.cart.controller.dto.response;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class CartItemRes {
+    private int stickerId;
+    private String mainImageUrl;
+    private String name;
+    private int price;
+    private int discountPrice;
+    private int count;
+}

server/src/main/java/org/tattour/server/domain/cart/controller/dto/response/CartItemsRes.java

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+package org.tattour.server.domain.cart.controller.dto.response;
+
+import java.util.List;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+import org.tattour.server.domain.order.provider.vo.OrderAmountDetailRes;
+
+@Getter
+@Setter
+@AllArgsConstructor
+public class CartItemsRes {
+    private List<CartItemRes> cartItemsRes;
+
+    private OrderAmountDetailRes orderAmountDetailRes;
+
+    public static CartItemsRes of(List<CartItemRes> cartItemsRes, OrderAmountDetailRes orderAmountDetailRes) {
+        return new CartItemsRes(cartItemsRes, orderAmountDetailRes);
+    }
+}

server/src/main/java/org/tattour/server/domain/cart/domain/Cart.java

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+package org.tattour.server.domain.cart.domain;
+
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import org.tattour.server.domain.sticker.domain.Sticker;
+import org.tattour.server.domain.user.domain.User;
+
+@Entity
+@Builder
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor(access = AccessLevel.PROTECTED)
+public class Cart {
+    private final static int COUNT_INCREMENT = 1;
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;
+    private Integer count;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "sticker_id")
+    private Sticker sticker;
+
+    public void addCount(int count) {
+        this.count += count;
+    }
+
+    public void increaseCount() {
+        this.count += COUNT_INCREMENT;
+    }
+}

server/src/main/java/org/tattour/server/domain/cart/facade/CartFacade.java

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+package org.tattour.server.domain.cart.facade;
+
+import org.tattour.server.domain.cart.controller.dto.request.SaveCartReq;
+import org.tattour.server.domain.cart.controller.dto.response.CartItemsRes;
+
+public interface CartFacade {
+    void saveCartItem(int userId, SaveCartReq req);
+
+    CartItemsRes getUserCartItems(int userId);
+
+    void increaseCartCount(int userId, int cartId);
+
+    void deleteCartItem(int userId, int cartId);
+}

server/src/main/java/org/tattour/server/domain/cart/facade/impl/CartFacadeImpl.java

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+package org.tattour.server.domain.cart.facade.impl;
+
+import static org.tattour.server.domain.order.facade.impl.OrderFacadeImpl.SHIPPING_FEE;
+
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.tattour.server.domain.cart.controller.dto.request.SaveCartReq;
+import org.tattour.server.domain.cart.controller.dto.response.CartItemsRes;
+import org.tattour.server.domain.cart.domain.Cart;
+import org.tattour.server.domain.cart.facade.CartFacade;
+import org.tattour.server.domain.cart.service.CartService;
+import org.tattour.server.domain.sticker.domain.Sticker;
+import org.tattour.server.domain.sticker.provider.StickerProvider;
+import org.tattour.server.domain.sticker.provider.vo.StickerOrderInfo;
+import org.tattour.server.domain.user.domain.User;
+import org.tattour.server.domain.user.service.UserService;
+import org.tattour.server.global.util.EntityDtoMapper;
+
+@Service
+@RequiredArgsConstructor
+public class CartFacadeImpl implements CartFacade {
+    private final CartService cartService;
+    private final UserService userService;
+    private final StickerProvider stickerProvider;
+
+    @Override
+    @Transactional
+    public void saveCartItem(int userId, SaveCartReq req) {
+        User user = userService.readUserById(userId);
+        Sticker sticker = stickerProvider.getById(req.getStickerId());
+
+        cartService.mergeOrAddToCart(user, sticker, req.getCount());
+    }
+
+    //todo : 배송 지역별 배송비 책정
+    @Override
+    public CartItemsRes getUserCartItems(int userId) {
+        List<Cart> carts = cartService.findByUserId(userId);
+        StickerOrderInfo stickerOrderInfo = stickerProvider.getStickerOrderInfoFromCart(carts);
+
+        return CartItemsRes.of(
+                EntityDtoMapper.INSTANCE.toCartItemsRes(carts),
+                EntityDtoMapper.INSTANCE.toOrderAmountRes(stickerOrderInfo, SHIPPING_FEE));
+    }
+
+    @Override
+    public void increaseCartCount(int userId, int cartId) {
+        Cart cart = cartService.findByIdAndUserId(userId, cartId);
+        cartService.increaseCartCount(cart);
+    }
+
+    @Override
+    public void deleteCartItem(int userId, int cartId) {
+        Cart cart = cartService.findByIdAndUserId(userId, cartId);
+        cartService.delete(cart);
+    }
+}

server/src/main/java/org/tattour/server/domain/cart/repository/CartRepository.java

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+package org.tattour.server.domain.cart.repository;
+
+import java.util.List;
+import java.util.Optional;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+import org.tattour.server.domain.cart.domain.Cart;
+import org.tattour.server.domain.sticker.domain.Sticker;
+import org.tattour.server.domain.user.domain.User;
+
+@Repository
+public interface CartRepository extends JpaRepository<Cart, Integer> {
+    List<Cart> findByUser_Id(int userId);
+
+    Optional<Cart> findByIdAndUser_Id(int id, int userId);
+
+    Optional<Cart> findCartByUserAndSticker(User user, Sticker sticker);
+}

server/src/main/java/org/tattour/server/domain/cart/service/CartService.java

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+package org.tattour.server.domain.cart.service;
+
+import java.util.List;
+import java.util.Optional;
+import org.tattour.server.domain.cart.domain.Cart;
+import org.tattour.server.domain.sticker.domain.Sticker;
+import org.tattour.server.domain.user.domain.User;
+
+public interface CartService {
+    List<Cart> findByUserId(int userId);
+
+    Optional<Cart> findByUserAndSticker(User user, Sticker sticker);
+
+    Cart findByIdAndUserId(int userId, int cartId);
+
+    void mergeOrAddToCart(User user, Sticker sticker, int count);
+
+    Cart createNewCart(User user, Sticker sticker, int count);
+
+    void increaseCartCount(Cart cart);
+
+    void delete(Cart cart);
+}