✨ 좋아요 및 좋아요 취소 API

src/app/mocks/consts/error.ts

@@ -1,4 +1,5 @@
 export const errorMessage = Object.freeze({
+  '0000': 'Unknown error',
   '4003': 'Malformed request body',
   '4040': 'Requested resource not found',
   '4220': 'Unprocessable Content',

src/app/mocks/handler/like.ts

@@ -41,13 +41,16 @@ export const likeHandlers = [
       return createHttpErrorResponse('4040');
     }
 
-    if (!likeInfo.isLiked) {
-      likeInfo.isLiked = true;
-      likeInfo.totalCount += 1;
-      feeds[formattedFeedId].isLiked = true;
-      feeds[formattedFeedId].likeCount += 1;
+    // 이미 좋아요 누른 경우
+    if (likeInfo.isLiked) {
+      return createHttpErrorResponse('0000');
     }
 
+    likeInfo.isLiked = true;
+    likeInfo.totalCount += 1;
+    feeds[formattedFeedId].isLiked = true;
+    feeds[formattedFeedId].likeCount += 1;
+
     return createHttpSuccessResponse({ isLiked: true });
   }),
 
@@ -66,13 +69,16 @@ export const likeHandlers = [
       return createHttpErrorResponse('4040');
     }
 
-    if (likeInfo.isLiked) {
-      likeInfo.isLiked = false;
-      likeInfo.totalCount -= 1;
-      feeds[formattedFeedId].isLiked = false;
-      feeds[formattedFeedId].likeCount -= 1;
+    // 이미 좋아요 취소를 누른 경우
+    if (!likeInfo.isLiked) {
+      return createHttpErrorResponse('0000');
     }
 
+    likeInfo.isLiked = false;
+    likeInfo.totalCount -= 1;
+    feeds[formattedFeedId].isLiked = false;
+    feeds[formattedFeedId].likeCount -= 1;
+
     return createHttpSuccessResponse({ isLiked: false });
   }),
 ];

src/features/feed-main-like/api/index.ts

@@ -0,0 +1 @@
+export { useLikes } from './useLikes';

src/features/feed-main-like/api/useLikes.tsx

@@ -0,0 +1,60 @@
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+
+import { requestLikeFeed, requestUnlikeFeed } from '@/shared/axios';
+import { QUERY_KEYS } from '@/shared/consts';
+import { isErrorResponse } from '@/shared/utils';
+
+import { FeedsQueryData } from '../consts';
+import { updateLikeStatusInFeeds } from '../lib';
+
+export const useLikes = (feedId: number, isLiked: boolean) => {
+  const queryClient = useQueryClient();
+
+  const { mutate: handleLikeFeed, isPending } = useMutation({
+    mutationFn: () =>
+      isLiked ? requestUnlikeFeed(feedId) : requestLikeFeed(feedId),
+    // mutate가 호출되면 ✨낙관적 업데이트를 위해 onMutate를 실행
+    onMutate: async () => {
+      // 진행중인 refetch가 있다면 취소시킨다.
+      await queryClient.cancelQueries({
+        queryKey: [QUERY_KEYS.feeds],
+      });
+
+      // 이전 쿼리값의 스냅샷
+      const previousQueryData = queryClient.getQueryData<FeedsQueryData>([
+        QUERY_KEYS.feeds,
+      ]);
+
+      if (!previousQueryData) return;
+
+      // 업데이트 될 쿼리값
+      const updatedQueryData = updateLikeStatusInFeeds(
+        previousQueryData,
+        feedId,
+      );
+
+      // setQueryData 함수를 사용해 newTodo로 Optimistic Update를 실시한다.
+      await queryClient.setQueryData([QUERY_KEYS.feeds], updatedQueryData);
+
+      return { previousQueryData };
+    },
+    onError: (_, __, context) => {
+      // Network Error일 경우 이전 쿼리값으로 롤백
+      queryClient.setQueryData([QUERY_KEYS.feeds], context?.previousQueryData);
+    },
+    onSuccess: (response, _, context) => {
+      // Nextwork Success일 경우 실행
+
+      if (isErrorResponse(response)) {
+        // 실패 시 이전 쿼리값으로 롤백
+        queryClient.setQueryData([QUERY_KEYS.feeds], context.previousQueryData);
+        return;
+      }
+
+      // 성공 시 피드 아이디에 해당하는 피드를 무효화한다.
+      queryClient.invalidateQueries({ queryKey: [QUERY_KEYS.feed, feedId] });
+    },
+  });
+
+  return { handleLikeFeed, isPending };
+};

src/features/feed-main-like/consts/index.ts

@@ -0,0 +1,6 @@
+import { FetchFeeds } from '@/shared/consts';
+
+export interface FeedsQueryData {
+  queryParams: number[];
+  pages: FetchFeeds[];
+}

src/features/feed-main-like/index.ts

@@ -0,0 +1 @@
+export { LikeButton } from './ui';

src/features/feed-main-like/lib/index.ts

@@ -0,0 +1,27 @@
+import { FeedsQueryData } from '../consts';
+
+export function updateLikeStatusInFeeds(
+  previousQueryData: FeedsQueryData,
+  feedId: number,
+) {
+  const { pages: previousPages } = previousQueryData;
+
+  return {
+    ...previousQueryData,
+    pages: previousPages.map((pageData) => {
+      const { data } = pageData;
+      const updateFeeds = data.feeds.map((feed) =>
+        feed.id === feedId
+          ? {
+              ...feed,
+              likeCount: feed.isLiked ? feed.likeCount - 1 : feed.likeCount + 1,
+              isLiked: !feed.isLiked,
+            }
+          : feed,
+      );
+      const updatedData = { ...data, feeds: updateFeeds };
+
+      return { ...pageData, data: updatedData };
+    }),
+  };
+}

src/features/feed-main-like/test/useLikes.test.tsx

@@ -0,0 +1,43 @@
+import { renderHook, act, waitFor } from '@testing-library/react';
+import { expect, test, vi } from 'vitest';
+
+import * as likeModule from '@/shared/axios/like';
+import { createQueryClientWrapper } from '@/shared/tests/setup';
+
+import { useLikes } from '../api';
+
+test('좋아요 상태가 아닐 때, 좋아요 버튼을 클릭하면 좋아요 요청이 발생한다.', async () => {
+  // given
+  // requestLikeFeed 함수를 스파이한다.
+  const spy = vi.spyOn(likeModule, 'requestLikeFeed');
+  const { result } = renderHook(() => useLikes(1, false), {
+    wrapper: createQueryClientWrapper(),
+  });
+
+  // requestLikeFeed가 호출되지 않았는지 확인
+  await waitFor(() => expect(spy).not.toHaveBeenCalled());
+
+  // when
+  // 좋아요 버튼 클릭
+  await act(async () => result.current.handleLikeFeed());
+
+  // then
+  // requestLikeFeed가 호출되었는지 확인
+  await waitFor(() => expect(spy).toHaveBeenCalled());
+});
+
+test('좋아요 상태일 때, 좋아요 버튼을 클릭하면 좋아요 취소 요청이 발생한다.', async () => {
+  // given
+  const spy = vi.spyOn(likeModule, 'requestUnlikeFeed');
+  const { result } = renderHook(() => useLikes(1, true), {
+    wrapper: createQueryClientWrapper(),
+  });
+
+  await waitFor(() => expect(spy).not.toHaveBeenCalled());
+
+  // when
+  await act(async () => result.current.handleLikeFeed());
+
+  // then
+  await waitFor(() => expect(spy).toHaveBeenCalled());
+});

src/features/feed-main-like/ui/LikeButton.tsx

@@ -0,0 +1,28 @@
+import { ICON_ACTIVE_COLOR } from '@/shared/consts';
+import { Icon } from '@/shared/ui';
+
+import { useLikes } from '../api';
+
+interface LikeButtonProps {
+  feedId: number;
+  isLiked: boolean;
+}
+
+export const LikeButton: React.FC<LikeButtonProps> = ({ feedId, isLiked }) => {
+  const { handleLikeFeed, isPending } = useLikes(feedId, isLiked);
+
+  return (
+    <button
+      className='icon icon-btn'
+      onClick={() => handleLikeFeed()}
+      disabled={isPending}
+    >
+      <Icon
+        name='like'
+        width='20'
+        height='20'
+        color={isLiked ? ICON_ACTIVE_COLOR : 'none'}
+      />
+    </button>
+  );
+};

src/features/feed-main-like/ui/index.ts

@@ -0,0 +1 @@
+export { LikeButton } from './LikeButton';

src/features/index.ts

@@ -0,0 +1 @@
+export { LikeButton } from './feed-main-like';

src/shared/axios/index.ts

@@ -1 +1,2 @@
 export { axiosInstance } from './config/instance';
+export * from './like';

src/shared/axios/like/index.ts

@@ -0,0 +1,23 @@
+import { axiosInstance } from '../config/instance';
+
+/**
+ * 좋아요 API
+ * @param feedId 피드 아이디
+ * @returns 좋아요 상태
+ */
+export async function requestLikeFeed(feedId: number) {
+  const { data } = await axiosInstance.put(`/feeds/${feedId}/likes`);
+
+  return data;
+}
+
+/**
+ * 좋아요 취소 API
+ * @param feedId 피드 아이디
+ * @returns 좋아요 상태
+ */
+export async function requestUnlikeFeed(feedId: number) {
+  const { data } = await axiosInstance.delete(`/feeds/${feedId}/likes`);
+
+  return data;
+}

src/shared/consts/color/color.ts

@@ -0,0 +1 @@
+export const ICON_ACTIVE_COLOR = '#00D5E1';

src/shared/consts/color/index.ts

@@ -0,0 +1 @@
+export * from './color';

src/shared/consts/index.ts

@@ -1,2 +1,3 @@
 export { QUERY_KEYS } from './query-key/queryKeys';
 export type * from './types';
+export * from './color';

src/shared/consts/types/feed.ts

@@ -1,5 +1,16 @@
 import { User } from '.';
 
+export interface FetchFeeds {
+  code: string;
+  data: {
+    currentPageNumber: number;
+    feeds: Feed[];
+    hasNextPage: boolean;
+    numberOfElements: number;
+    pageSize: number;
+  };
+}
+
 export interface Feed {
   id: number;
   user: Pick<User, 'id' | 'profileImage' | 'name'>;

src/shared/consts/types/index.ts

@@ -1,4 +1,4 @@
-export type { Feed, Image } from './feed';
+export type * from './feed';
 export type { Comment } from './comment';
 export type { Like } from './like';
 export type { User, RelationshipStatus } from './user';

src/shared/tests/setup.tsx

@@ -1,23 +1,40 @@
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { render as testRender } from '@testing-library/react';
-import { ReactElement } from 'react';
+import { PropsWithChildren, ReactElement } from 'react';
 import { MemoryRouter } from 'react-router-dom';
 
-function customRender(children: ReactElement, baseEntries?: string[]) {
-  const queryClient = new QueryClient({
+const generateQueryClient = () => {
+  const queryClientOptions = {
     defaultOptions: {
       queries: {
         retry: false,
       },
     },
-  });
+  };
+
+  return new QueryClient(queryClientOptions);
+};
+
+// hooks를 사용하는 컴포넌트를 테스트할 때 필요한 wrapper를 생성하는 함수
+// from https://tkdodo.eu/blog/testing-react-query#for-custom-hooks
+export const createQueryClientWrapper = () => {
+  const queryClient = generateQueryClient();
+  return ({ children }: PropsWithChildren) => (
+    <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
+  );
+};
+
+// custom render 함수
+// reference: https://testing-library.com/docs/react-testing-library/setup#custom-render
+const customRender = (children: ReactElement, baseEntries?: string[]) => {
+  const queryClient = generateQueryClient();
 
   return testRender(
     <QueryClientProvider client={queryClient}>
       <MemoryRouter initialEntries={baseEntries}>{children}</MemoryRouter>
     </QueryClientProvider>,
   );
-}
+};
 
 // eslint-disable-next-line react-refresh/only-export-components
 export * from '@testing-library/react';

src/shared/ui/icon/ui/Icon.tsx

@@ -10,7 +10,10 @@ interface IconProps {
 export const Icon: React.FC<IconProps> = ({ name, width, height, color }) => {
   return (
     <svg width={width} height={height} fill={color || 'none'}>
-      <use xlinkHref={`assets/sprites/common.svg#${name}-icon`} />
+      <use
+        xlinkHref={`assets/sprites/common.svg#${name}-icon`}
+        color={color || 'none'}
+      />
     </svg>
   );
 };

src/shared/utils/date/index.ts

@@ -0,0 +1 @@
+export * from './date';

src/shared/utils/index.ts

@@ -1 +1,2 @@
-export * from './date/date';
+export * from './date';
+export * from './response';

src/shared/utils/response/index.ts

@@ -0,0 +1 @@
+export * from './response';

src/shared/utils/response/response.ts

@@ -0,0 +1,8 @@
+interface Response {
+  code: string;
+  data: unknown;
+}
+
+export function isErrorResponse(response: Response) {
+  return response.code !== '2000';
+}

src/widgets/feed-main-list/api/useInfinityFeeds.tsx

@@ -1,18 +1,7 @@
 import { useInfiniteQuery } from '@tanstack/react-query';
 
 import { axiosInstance } from '@/shared/axios';
-import { Feed, QUERY_KEYS } from '@/shared/consts';
-
-interface FetchFeeds {
-  code: string;
-  data: {
-    currentPageNumber: number;
-    feeds: Feed[];
-    hasNextPage: boolean;
-    numberOfElements: number;
-    pageSize: number;
-  };
-}
+import { FetchFeeds, QUERY_KEYS } from '@/shared/consts';
 
 async function fetchFeeds(
   page: number,