Merge pull request #132 from NMNB-Team/v1/refactor/#131-video-like-response

[refactor] 영상 랜덤 조회 응답에 좋아요 값 추가

Author: 88dldl

nmnb-application/src/main/kotlin/nmnb/application/domain/like/service/LikeService.kt

@@ -6,4 +6,5 @@ import nmnb.domain.user.User
 interface LikeService {
     fun likeOrUnlike(user: User, request: PostLikeServiceRequest)
     fun deleteByPostId(postId: Long)
+    fun isLikedByUser(userId: String, postId: Long): Boolean
 }

nmnb-application/src/main/kotlin/nmnb/application/domain/like/service/LikeServiceImpl.kt

@@ -33,6 +33,11 @@ class LikeServiceImpl(
         likeRepository.deleteAllByPostId(postId)
     }
 
+    override fun isLikedByUser(userId: String, postId: Long): Boolean {
+        val likeCacheKey = LikeCacheKey(userId, postId)
+        return redisTemplate.hasKey(likeCacheKey.key)
+    }
+
     private fun setLikeCache(likeCacheKey: LikeCacheKey) {
         redisTemplate.opsForValue().set(likeCacheKey.key, "1")
     }

nmnb-application/src/main/kotlin/nmnb/application/domain/post/service/PostServiceImpl.kt

@@ -34,7 +34,7 @@ class PostServiceImpl(
         val startIndex = request.cursor + 1
         val extractedIds = RandomSelector.extractPageIds(shuffledPostIds, startIndex, request.size)
 
-        return toPostPageResponse(extractedIds, shuffledPostIds, startIndex)
+        return toPostPageResponse(extractedIds, shuffledPostIds, startIndex, userId)
     }
 
     @Transactional
@@ -85,7 +85,7 @@ class PostServiceImpl(
         val content = if (hasNext) posts.dropLast(1) else posts
         val nextCursorId = if (hasNext) content.lastOrNull()?.id else -1
 
-        val postsResponse = content.map { post -> PostInfoResponse.of(post) }
+        val postsResponse = content.map { post -> PostInfoResponse.of(post, false) }
         return MyPostPageResponse.of(postsResponse, hasNext, nextCursorId)
     }
 
@@ -126,18 +126,21 @@ class PostServiceImpl(
         pageIds: List<Long>,
         shuffledPostIds: List<Long>,
         startIndex: Int,
+        userId: String?,
     ): PostPageResponse {
-        val postsInfoResponse = mapPostsToResponse(pageIds)
+        val postsInfoResponse = mapPostsToResponse(pageIds, userId)
         val hasNext = shuffledPostIds.size > (startIndex + pageIds.size)
         val nextCursor = if (!hasNext) INITIAL_CURSOR else startIndex + pageIds.size - 1
 
         return PostPageResponse.of(postsInfoResponse, hasNext, nextCursor)
     }
 
-    private fun mapPostsToResponse(pageIds: List<Long>): List<PostInfoResponse> {
+    private fun mapPostsToResponse(pageIds: List<Long>, userId: String?): List<PostInfoResponse> {
         val postsMap = fetchPostsByIds(pageIds)
         return pageIds.map { id ->
-            PostInfoResponse.of(postsMap[id]!!)
+            val post = postsMap[id]!!
+            val isLiked = userId?.let { likeService.isLikedByUser(it, id) } ?: false
+            PostInfoResponse.of(post, isLiked)
         }
     }
 

nmnb-application/src/main/kotlin/nmnb/application/domain/post/service/dto/response/PostPageResponse.kt

@@ -46,16 +46,18 @@ data class PostInfoResponse(
     val thumbnailUrl: String,
     val description: String?,
     val userInfo: UserInfoResponse,
+    val isLiked: Boolean,
 ) {
     companion object {
-        fun of(post: Post): PostInfoResponse {
+        fun of(post: Post, isLiked: Boolean = false): PostInfoResponse {
             return PostInfoResponse(
                 userId = post.user.id,
                 postId = post.id,
                 url = post.url,
                 thumbnailUrl = post.thumbnailUrl,
                 description = post.description,
                 userInfo = UserInfoResponse.of(post.user),
+                isLiked = isLiked,
             )
         }
     }