플레이 리스트 상세 API 추가

src/main/kotlin/kr/co/vividnext/sodalive/content/playlist/AudioContentPlaylistController.kt

@@ -55,4 +55,14 @@ class AudioContentPlaylistController(private val service: AudioContentPlaylistSe
 
         ApiResponse.ok(service.getPlaylists(member))
     }
+
+    @GetMapping("/{id}")
+    fun getPlaylistDetail(
+        @PathVariable id: Long,
+        @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?
+    ) = run {
+        if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
+
+        ApiResponse.ok(service.getPlaylistDetail(playlistId = id, member = member))
+    }
 }

src/main/kotlin/kr/co/vividnext/sodalive/content/playlist/AudioContentPlaylistService.kt

@@ -7,6 +7,8 @@ import kr.co.vividnext.sodalive.live.roulette.RedisIdGenerator
 import kr.co.vividnext.sodalive.member.Member
 import org.springframework.data.repository.findByIdOrNull
 import org.springframework.stereotype.Service
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
 
 @Service
 class AudioContentPlaylistService(
@@ -113,6 +115,33 @@ class AudioContentPlaylistService(
         redisRepository.delete(playlist)
     }
 
+    fun getPlaylistDetail(playlistId: Long, member: Member): GetPlaylistDetailResponse {
+        val playlist = redisRepository.findByIdOrNull(id = playlistId)
+            ?: throw SodaException("잘못된 요청입니다.")
+
+        if (playlist.memberId != member.id) {
+            throw SodaException("잘못된 요청입니다.")
+        }
+
+        val dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd")
+        val createdDate = playlist.createdAt
+            .atZone(ZoneId.of("UTC"))
+            .withZoneSameInstant(ZoneId.of("Asia/Seoul"))
+            .format(dateTimeFormatter)
+
+        val contentList = audioContentRepository.fetchContentForPlaylist(contentIdList = playlist.contentIdList)
+
+        return GetPlaylistDetailResponse(
+            playlistId = playlist.id,
+            title = playlist.title,
+            desc = playlist.desc ?: "",
+            createdDate = createdDate,
+            contentCount = contentList.size,
+            playlistCoverImageList = contentList.take(4).map { it.coverUrl },
+            contentList = contentList
+        )
+    }
+
     companion object {
         const val SEQUENCE_NAME = "AudioContentPlaylist:sequence"
     }

src/main/kotlin/kr/co/vividnext/sodalive/content/playlist/GetPlaylistDetailResponse.kt

@@ -0,0 +1,11 @@
+package kr.co.vividnext.sodalive.content.playlist
+
+data class GetPlaylistDetailResponse(
+    val playlistId: Long,
+    val title: String,
+    val desc: String,
+    val createdDate: String,
+    val contentCount: Int,
+    val playlistCoverImageList: List<String>,
+    val contentList: List<AudioContentPlaylistContent>
+)