[FEAT] 챗봇 /chat 채팅방 조회 API 구현

Author: simhyunmin

src/main/java/fitfit/domain/chat/controller/ChatRestController.java

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+package fitfit.domain.chat.controller;
+
+import fitfit.domain.chat.dto.ChatResponseDTO;
+import fitfit.domain.chat.service.ChatQueryService;
+import fitfit.global.apiPayload.ApiResponse;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.Parameters;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/chat")
+@RequiredArgsConstructor
+@Tag(name = "Chat", description = "챗봇 관련 API")
+public class ChatRestController {
+
+    private final ChatQueryService chatQueryService;
+
+    @GetMapping("")
+    @Operation(summary = "챗봇 대화 내용 조회 API", description = "챗봇과 사용자의 대화 내용을 조회하는 API입니다.")
+    @Parameters({
+            @Parameter(name = "Authorization", description = "Bearer 액세스 토큰", required = true, in = io.swagger.v3.oas.annotations.enums.ParameterIn.HEADER)
+    })
+    @ApiResponses({
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "OK, 성공"),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "401", description = "인증이 필요합니다.", content = @Content(schema = @Schema(implementation = ApiResponse.class))),
+            @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "404", description = "존재하지 않는 회원입니다.", content = @Content(schema = @Schema(implementation = ApiResponse.class)))
+    })
+    public ApiResponse<ChatResponseDTO.ChatHistoryDTO> getChatHistory(@RequestHeader("Authorization") String authorization) {
+        return ApiResponse.onSuccess(chatQueryService.getChatHistory(authorization));
+    }
+}

src/main/java/fitfit/domain/chat/converter/ChatConverter.java

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+package fitfit.domain.chat.converter;
+
+import fitfit.domain.chat.dto.ChatResponseDTO;
+import fitfit.domain.chat.entity.BotChat;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class ChatConverter {
+
+    public static ChatResponseDTO.ChatMessageDTO toChatMessageDTO(BotChat chat) {
+        return ChatResponseDTO.ChatMessageDTO.builder()
+                .sender(chat.getIsMember() ? "user" : "bot")
+                .content(chat.getContent())
+                .createdAt(chat.getCreatedAt())
+                .build();
+    }
+
+    public static ChatResponseDTO.ChatHistoryDTO toChatHistoryDTO(List<BotChat> chats) {
+        List<ChatResponseDTO.ChatMessageDTO> messages = chats.stream()
+                .map(ChatConverter::toChatMessageDTO)
+                .collect(Collectors.toList());
+        return ChatResponseDTO.ChatHistoryDTO.builder()
+                .messages(messages)
+                .build();
+    }
+}

src/main/java/fitfit/domain/chat/dto/ChatResponseDTO.java

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+package fitfit.domain.chat.dto;
+
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+public class ChatResponseDTO {
+
+    @Getter
+    @Builder
+    public static class ChatHistoryDTO {
+        private List<ChatMessageDTO> messages;
+    }
+
+    @Getter
+    @Builder
+    public static class ChatMessageDTO {
+        private String sender; // "user" or "bot"
+        private String content;
+        private LocalDateTime createdAt;
+    }
+}

src/main/java/fitfit/domain/chat/repository/BotChatRepository.java

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+package fitfit.domain.chat.repository;
+
+import fitfit.domain.chat.entity.BotChat;
+import org.springframework.data.jpa.repository.JpaRepository;
+import java.util.List;
+
+public interface BotChatRepository extends JpaRepository<BotChat, Long> {
+    List<BotChat> findAllByMemberIdOrderByCreatedAtAsc(Long memberId);
+}

src/main/java/fitfit/domain/chat/service/ChatQueryService.java

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+package fitfit.domain.chat.service;
+
+import fitfit.domain.chat.dto.ChatResponseDTO;
+
+public interface ChatQueryService {
+    ChatResponseDTO.ChatHistoryDTO getChatHistory(String authorization);
+}

src/main/java/fitfit/domain/chat/service/ChatQueryServiceImpl.java

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+package fitfit.domain.chat.service;
+
+import fitfit.domain.chat.converter.ChatConverter;
+import fitfit.domain.chat.dto.ChatResponseDTO;
+import fitfit.domain.chat.entity.BotChat;
+import fitfit.domain.chat.repository.BotChatRepository;
+import fitfit.domain.member.repository.MemberRepository;
+import fitfit.domain.token.provider.JwtProvider;
+import fitfit.global.apiPayload.code.status.ErrorStatus;
+import fitfit.global.apiPayload.exception.handler.MemberHandler;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class ChatQueryServiceImpl implements ChatQueryService {
+
+    private final BotChatRepository botChatRepository;
+    private final MemberRepository memberRepository;
+    private final JwtProvider jwtProvider;
+
+    @Override
+    public ChatResponseDTO.ChatHistoryDTO getChatHistory(String authorization) {
+        Long memberId = jwtProvider.getMemberIdAndValidateToken(authorization);
+        memberRepository.findById(memberId).orElseThrow(() -> new MemberHandler(ErrorStatus.MEMBER_NOT_FOUND));
+        List<BotChat> chats = botChatRepository.findAllByMemberIdOrderByCreatedAtAsc(memberId);
+        return ChatConverter.toChatHistoryDTO(chats);
+    }
+}