feat(be): add userChat DTO layer

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/controller/ChatMessageController.kt

@@ -1,6 +1,8 @@
 package com.back.koreaTravelGuide.domain.userChat.chatmessage.controller
 
 import com.back.koreaTravelGuide.common.ApiResponse
+import com.back.koreaTravelGuide.domain.userChat.chatmessage.dto.ChatMessageResponse
+import com.back.koreaTravelGuide.domain.userChat.chatmessage.dto.ChatMessageSendRequest
 import com.back.koreaTravelGuide.domain.userChat.chatmessage.service.ChatMessageService
 import org.springframework.http.ResponseEntity
 import org.springframework.messaging.simp.SimpMessagingTemplate
@@ -23,26 +25,28 @@ class ChatMessageController(
         @PathVariable roomId: Long,
         @RequestParam(required = false) after: Long?,
         @RequestParam(defaultValue = "50") limit: Int,
-    ): ResponseEntity<ApiResponse<Any>> {
+    ): ResponseEntity<ApiResponse<List<ChatMessageResponse>>> {
         val messages =
             if (after == null) {
                 messageService.getlistbefore(roomId, limit)
             } else {
                 messageService.getlistafter(roomId, after)
             }
-        return ResponseEntity.ok(ApiResponse(msg = "메시지 조회", data = messages))
+        val responseMessages = messages.map(ChatMessageResponse::from)
+        return ResponseEntity.ok(ApiResponse(msg = "메시지 조회", data = responseMessages))
     }
 
     @PostMapping("/{roomId}/messages")
     fun sendMessage(
         @PathVariable roomId: Long,
-        @RequestBody req: ChatMessageService.SendMessageReq,
-    ): ResponseEntity<ApiResponse<Any>> {
-        val saved = messageService.send(roomId, req)
+        @RequestBody req: ChatMessageSendRequest,
+    ): ResponseEntity<ApiResponse<ChatMessageResponse>> {
+        val saved = messageService.send(roomId, req.senderId, req.content)
+        val response = ChatMessageResponse.from(saved)
         messagingTemplate.convertAndSend(
             "/topic/userchat/$roomId",
-            ApiResponse(msg = "메시지 전송", data = saved),
+            ApiResponse(msg = "메시지 전송", data = response),
         )
-        return ResponseEntity.status(201).body(ApiResponse(msg = "메시지 전송", data = saved))
+        return ResponseEntity.status(201).body(ApiResponse(msg = "메시지 전송", data = response))
     }
 }

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/controller/ChatMessageSocketController.kt

@@ -1,6 +1,8 @@
 package com.back.koreaTravelGuide.domain.userChat.chatmessage.controller
 
 import com.back.koreaTravelGuide.common.ApiResponse
+import com.back.koreaTravelGuide.domain.userChat.chatmessage.dto.ChatMessageResponse
+import com.back.koreaTravelGuide.domain.userChat.chatmessage.dto.ChatMessageSendRequest
 import com.back.koreaTravelGuide.domain.userChat.chatmessage.service.ChatMessageService
 import org.springframework.messaging.handler.annotation.DestinationVariable
 import org.springframework.messaging.handler.annotation.MessageMapping
@@ -16,12 +18,13 @@ class ChatMessageSocketController(
     @MessageMapping("/userchat/{roomId}/messages")
     fun handleMessage(
         @DestinationVariable roomId: Long,
-        @Payload req: ChatMessageService.SendMessageReq,
+        @Payload req: ChatMessageSendRequest,
     ) {
-        val saved = chatMessageService.send(roomId, req)
+        val saved = chatMessageService.send(roomId, req.senderId, req.content)
+        val response = ChatMessageResponse.from(saved)
         messagingTemplate.convertAndSend(
             "/topic/userchat/$roomId",
-            ApiResponse(msg = "메시지 전송", data = saved),
+            ApiResponse(msg = "메시지 전송", data = response),
         )
     }
 }

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/dto/ChatMessageResponse.kt

@@ -0,0 +1,24 @@
+package com.back.koreaTravelGuide.domain.userChat.chatmessage.dto
+
+import com.back.koreaTravelGuide.domain.userChat.chatmessage.entity.ChatMessage
+import java.time.Instant
+
+data class ChatMessageResponse(
+    val id: Long?,
+    val roomId: Long,
+    val senderId: Long,
+    val content: String,
+    val createdAt: Instant,
+) {
+    companion object {
+        fun from(message: ChatMessage): ChatMessageResponse {
+            return ChatMessageResponse(
+                id = message.id,
+                roomId = message.roomId,
+                senderId = message.senderId,
+                content = message.content,
+                createdAt = message.createdAt,
+            )
+        }
+    }
+}

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/dto/ChatMessageSendRequest.kt

@@ -0,0 +1,6 @@
+package com.back.koreaTravelGuide.domain.userChat.chatmessage.dto
+
+data class ChatMessageSendRequest(
+    val senderId: Long,
+    val content: String,
+)

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatmessage/service/ChatMessageService.kt

@@ -11,8 +11,6 @@ class ChatMessageService(
     private val messageRepository: ChatMessageRepository,
     private val roomRepository: ChatRoomRepository,
 ) {
-    data class SendMessageReq(val senderId: Long, val content: String)
-
     @Transactional(readOnly = true)
     fun getlistbefore(
         roomId: Long,
@@ -28,9 +26,10 @@ class ChatMessageService(
     @Transactional
     fun send(
         roomId: Long,
-        req: SendMessageReq,
+        senderId: Long,
+        content: String,
     ): ChatMessage {
-        val saved = messageRepository.save(ChatMessage(roomId = roomId, senderId = req.senderId, content = req.content))
+        val saved = messageRepository.save(ChatMessage(roomId = roomId, senderId = senderId, content = content))
         roomRepository.findById(roomId).ifPresent {
             roomRepository.save(it.copy(updatedAt = saved.createdAt, lastMessageId = saved.id))
         }

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatroom/controller/ChatRoomController.kt

@@ -1,6 +1,9 @@
 package com.back.koreaTravelGuide.domain.userChat.chatroom.controller
 
 import com.back.koreaTravelGuide.common.ApiResponse
+import com.back.koreaTravelGuide.domain.userChat.chatroom.dto.ChatRoomDeleteRequest
+import com.back.koreaTravelGuide.domain.userChat.chatroom.dto.ChatRoomResponse
+import com.back.koreaTravelGuide.domain.userChat.chatroom.dto.ChatRoomStartRequest
 import com.back.koreaTravelGuide.domain.userChat.chatroom.service.ChatRoomService
 import org.springframework.http.ResponseEntity
 import org.springframework.web.bind.annotation.DeleteMapping
@@ -16,23 +19,19 @@ import org.springframework.web.bind.annotation.RestController
 class ChatRoomController(
     private val roomService: ChatRoomService,
 ) {
-    data class StartChatReq(val guideId: Long, val userId: Long)
-
-    data class DeleteChatReq(val userId: Long)
-
     // 같은 페어는 방 재사용
     @PostMapping("/start")
     fun startChat(
-        @RequestBody req: StartChatReq,
-    ): ResponseEntity<ApiResponse<Map<String, Long>>> {
-        val roomId = roomService.exceptOneToOneRoom(req.guideId, req.userId).id!!
-        return ResponseEntity.ok(ApiResponse(msg = "채팅방 시작", data = mapOf("roomId" to roomId)))
+        @RequestBody req: ChatRoomStartRequest,
+    ): ResponseEntity<ApiResponse<ChatRoomResponse>> {
+        val room = roomService.exceptOneToOneRoom(req.guideId, req.userId)
+        return ResponseEntity.ok(ApiResponse(msg = "채팅방 시작", data = ChatRoomResponse.from(room)))
     }
 
     @DeleteMapping("/{roomId}")
     fun deleteRoom(
         @PathVariable roomId: Long,
-        @RequestBody req: DeleteChatReq,
+        @RequestBody req: ChatRoomDeleteRequest,
     ): ResponseEntity<ApiResponse<Unit>> {
         roomService.deleteByOwner(roomId, req.userId)
         return ResponseEntity.ok(ApiResponse("채팅방 삭제 완료"))
@@ -41,5 +40,8 @@ class ChatRoomController(
     @GetMapping("/{roomId}")
     fun get(
         @PathVariable roomId: Long,
-    ) = ResponseEntity.ok(ApiResponse(msg = "채팅방 조회", data = roomService.get(roomId)))
+    ): ResponseEntity<ApiResponse<ChatRoomResponse>> {
+        val room = roomService.get(roomId)
+        return ResponseEntity.ok(ApiResponse(msg = "채팅방 조회", data = ChatRoomResponse.from(room)))
+    }
 }

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatroom/dto/ChatRoomDeleteRequest.kt

@@ -0,0 +1,5 @@
+package com.back.koreaTravelGuide.domain.userChat.chatroom.dto
+
+data class ChatRoomDeleteRequest(
+    val userId: Long,
+)

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatroom/dto/ChatRoomResponse.kt

@@ -0,0 +1,26 @@
+package com.back.koreaTravelGuide.domain.userChat.chatroom.dto
+
+import com.back.koreaTravelGuide.domain.userChat.chatroom.entity.ChatRoom
+import java.time.Instant
+
+data class ChatRoomResponse(
+    val id: Long?,
+    val title: String,
+    val guideId: Long,
+    val userId: Long,
+    val updatedAt: Instant,
+    val lastMessageId: Long?,
+) {
+    companion object {
+        fun from(room: ChatRoom): ChatRoomResponse {
+            return ChatRoomResponse(
+                id = room.id,
+                title = room.title,
+                guideId = room.guideId,
+                userId = room.userId,
+                updatedAt = room.updatedAt,
+                lastMessageId = room.lastMessageId,
+            )
+        }
+    }
+}

src/main/kotlin/com/back/koreaTravelGuide/domain/userChat/chatroom/dto/ChatRoomStartRequest.kt

@@ -0,0 +1,6 @@
+package com.back.koreaTravelGuide.domain.userChat.chatroom.dto
+
+data class ChatRoomStartRequest(
+    val guideId: Long,
+    val userId: Long,
+)