feat: 친구 수락하기 API

api-module/src/main/java/com/foodgo/apimodule/community/application/FriendFindUseCase.java

@@ -10,13 +10,15 @@
 import com.foodgo.coremodule.user.service.UserQueryService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.stream.Collectors;
 
 @Service
 @RequiredArgsConstructor
+@Transactional(readOnly = true)
 public class FriendFindUseCase {
 
     private final UserQueryService userQueryService;

api-module/src/main/java/com/foodgo/apimodule/community/application/FriendSaveUseCase.java

@@ -1,9 +1,22 @@
 package com.foodgo.apimodule.community.application;
 
+import com.foodgo.coremodule.community.domain.Friendship;
+import com.foodgo.coremodule.community.service.FriendQueryService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 @Service
 @RequiredArgsConstructor
+@Transactional
 public class FriendSaveUseCase {
+
+    private final FriendQueryService friendQueryService;
+
+    public void acceptFriendRequest(Long userId, Long friendId) {
+
+        Friendship friendship = friendQueryService.findByUserIdAndFriendId(userId, friendId);
+        friendship.markAsMutual();
+        friendQueryService.save(friendship);
+    }
 }

api-module/src/main/java/com/foodgo/apimodule/community/presentation/CommunityController.java

@@ -13,10 +13,7 @@
 import io.swagger.v3.oas.annotations.tags.Tag;
 import lombok.RequiredArgsConstructor;
 import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.PathVariable;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
 
@@ -96,5 +93,24 @@ public ApplicationResponse<List<FriendRequestList>> findFriendRequestList(
     }
 
     // 친구 수락하기
+    @PatchMapping("/friend/accept/{friendId}")
+    @ApiResponses(
+            value = {
+                    @ApiResponse(
+                            responseCode = "200",
+                            description = "친구 수락하기",
+                            useReturnTypeSchema = true
+                    )
+            }
+    )
+    @Operation(summary = "친구 수락 API", description = "친구 수락 API 입니다.")
+    public ApplicationResponse<String> acceptFriend(
+            @UserResolver User user,
+            @PathVariable Long friendId
+    ) {
+
+        friendSaveUseCase.acceptFriendRequest(user.getId(), friendId);
+        return ApplicationResponse.onSuccess("친구 수락하였습니다.");
+    }
 
 }

core-module/src/main/java/com/foodgo/coremodule/community/service/FriendQueryService.java

@@ -32,4 +32,8 @@ public List<User> findFriendRequestList(Long userId) {
         return friendShipRepository.findFriendshipsByUserId(userId)
                 .stream().map(Friendship::getFriend).toList();
     }
+
+    public void save(Friendship friendship) {
+        friendShipRepository.save(friendship);
+    }
 }