Feature/#60 backend chatting

backend/src/main/java/com/hjjang/backend/domain/chat/controller/ChatMessageController.java

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+package com.hjjang.backend.domain.chat.controller;
+
+
+import com.hjjang.backend.domain.chat.dto.MessageRequest;
+import com.hjjang.backend.domain.chat.service.ChatMessageService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.messaging.handler.annotation.MessageMapping;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequiredArgsConstructor
+public class ChatMessageController {
+
+    private final ChatMessageService chatMessageService;
+
+    // 일반 채팅 보내기
+    @MessageMapping("/text/{roomId}")
+    public void chatByText(@PathVariable("roomId") Long roomId, @RequestBody MessageRequest messageRequest) {
+        chatMessageService.chatByText(roomId, messageRequest);
+    }
+
+    // 사진 채팅 보내기
+    @MessageMapping("/image")
+    public void chatByImage() {
+
+    }
+
+    // 이모티콘 채팅 보내기
+    @MessageMapping("/emoji")
+    public void chatByEmoji() {
+
+    }
+
+
+    // 메시지 숨기기
+    @DeleteMapping
+    public void hideMessage() {
+
+    }
+
+    // 메시지 조회 / 페이징
+    @GetMapping("/{chatRoomId}")
+    public void readMessageByChatRoom() {
+
+    }
+
+
+}

backend/src/main/java/com/hjjang/backend/domain/chat/controller/ChatRoomController.java

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+package com.hjjang.backend.domain.chat.controller;
+
+
+import com.hjjang.backend.domain.chat.dto.CreateTradeChatRoomResponse;
+import com.hjjang.backend.domain.chat.service.ChatRoomService;
+import com.hjjang.backend.global.response.response.SuccessResponse;
+import com.hjjang.backend.global.util.UserUtil;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import static com.hjjang.backend.global.response.code.SuccessCode.CREATE_CHAT_ROOM_SUCCESS;
+
+@RequestMapping("/api/chatroom")
+@RestController
+@RequiredArgsConstructor
+public class ChatRoomController {
+
+    private final ChatRoomService chatRoomService;
+    private final UserUtil userUtil;
+
+    // 채팅방 생성 test를 위한 api
+    // 채팅방은 거래 시작 혹은 경매 시작과 동시에 생성되기 때문
+    @PostMapping("/trade/{sellerId}")
+    public ResponseEntity<SuccessResponse> createChatRoom(@PathVariable Long sellerId) {
+        CreateTradeChatRoomResponse createTradeChatRoomResponse
+                = chatRoomService.createChatTradeRoomBySellerId(sellerId);
+        return ResponseEntity.ok(SuccessResponse.of(CREATE_CHAT_ROOM_SUCCESS, createTradeChatRoomResponse));
+    }
+
+    // 채팅 방 리스트 조회 / 페이징
+    @GetMapping
+    public void readPagingChatRoomList() {
+
+    }
+
+    // 채팅 방 신고하기
+    @PostMapping("/report")
+    public void reportChatRoom() {
+
+    }
+
+
+    // 규정을 어길 시 채팅 방 삭제하기
+    @DeleteMapping("/{chatRoomId}")
+    public void hideChatRoom() {
+
+    }
+
+
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/entity/ChatMessage.java

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+package com.hjjang.backend.domain.chat.domain.entity;
+
+import com.hjjang.backend.domain.user.entity.User;
+import com.hjjang.backend.global.domain.BaseCreatedTimeEntity;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+import static javax.persistence.FetchType.LAZY;
+import static javax.persistence.GenerationType.IDENTITY;
+import static lombok.AccessLevel.PROTECTED;
+
+@Getter
+@AllArgsConstructor
+@Entity
+@NoArgsConstructor(access = PROTECTED)
+@DiscriminatorColumn
+@Inheritance(strategy = InheritanceType.JOINED)
+@Table(name = "chat_message")
+public class ChatMessage extends BaseCreatedTimeEntity {
+
+    @Id
+    @GeneratedValue(strategy = IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = LAZY)
+    @JoinColumn(name = "sender_user_id")
+    private User senderUser;
+
+    @ManyToOne(fetch = LAZY)
+    @JoinColumn(name = "chat_room_id")
+    private ChatRoom chatRoom;
+
+    // chatting 할 때 이미지 메세지, 이모티콘, 이미지를 구별할 수 있는 dtype
+    // 없어도 되지만 명시적으로 선언
+    @Column(updatable = false)
+    private String dtype;
+
+    public ChatMessage(User senderUser, ChatRoom chatRoom) {
+        this.senderUser = senderUser;
+        this.chatRoom = chatRoom;
+
+    }
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/entity/ChatMessageEmoji.java

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+package com.hjjang.backend.domain.chat.domain.entity;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Column;
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+import javax.persistence.Table;
+
+@Getter
+@Entity
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@DiscriminatorValue("emoji")
+@Table(name = "chat_message_emoji")
+public class ChatMessageEmoji extends ChatMessage {
+
+    @Column(name = "chat_message_emoji_content")
+    private Emoji emoji;
+
+
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/entity/ChatMessageImage.java

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+package com.hjjang.backend.domain.chat.domain.entity;
+
+import com.hjjang.backend.domain.image.domain.entity.Image;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Getter
+@Entity
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@DiscriminatorValue("image")
+@Table(name = "chat_message_image")
+public class ChatMessageImage extends ChatMessage {
+
+    @OneToOne
+    @JoinColumn(name = "image_id")
+    private Image image;
+
+
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/entity/ChatMessageText.java

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+package com.hjjang.backend.domain.chat.domain.entity;
+
+import com.hjjang.backend.domain.user.entity.User;
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Column;
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+import javax.persistence.Table;
+
+@Getter
+@Entity
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@DiscriminatorValue("text")
+@Table(name = "chat_message_text")
+public class ChatMessageText extends ChatMessage {
+
+    @Column(name = "chat_message_text_content")
+    private String chatMessageContent;
+
+    public ChatMessageText(User senderUser, ChatRoom chatRoom, String chatMessageContent) {
+        super(senderUser, chatRoom);
+        this.chatMessageContent = chatMessageContent;
+    }
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/entity/ChatRoom.java

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+package com.hjjang.backend.domain.chat.domain.entity;
+
+import com.hjjang.backend.domain.user.entity.User;
+import com.hjjang.backend.global.domain.BaseTimeEntity;
+import lombok.*;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
+import static javax.persistence.FetchType.LAZY;
+
+@Getter
+@Entity
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(name = "chat_room")
+public class ChatRoom extends BaseTimeEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    // 경매 상황을 대비하여 생성 유저를 알 수 있는 컬럼을 만들었다.
+    @ManyToOne(fetch = LAZY)
+    @JoinColumn(name = "created_by_user_id")
+    private User createdByUser;
+
+    @OneToMany(mappedBy = "chatRoom")
+    private List<ChatRoomUser> chatRoomUsers = new ArrayList<>();
+
+    // 채팅방 삭제 관련 컬럼
+    @Column(name = "is_hidden")
+    private Boolean isHidden;
+
+    @Builder
+    public ChatRoom(User createdByUser, List<ChatRoomUser> chatRoomUsers) {
+        this.createdByUser = createdByUser;
+        this.chatRoomUsers = chatRoomUsers;
+        this.isHidden = false;
+    }
+
+    public void hideChatRoom() {
+        this.isHidden = true;
+    }
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/entity/ChatRoomUser.java

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+package com.hjjang.backend.domain.chat.domain.entity;
+
+import com.hjjang.backend.domain.user.entity.User;
+import lombok.*;
+
+import javax.persistence.*;
+
+import static javax.persistence.FetchType.LAZY;
+
+@Getter
+@Entity
+@AllArgsConstructor
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(name = "chat_room_user")
+public class ChatRoomUser {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = LAZY)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "chat_room_id")
+    private ChatRoom chatRoom;
+
+    @Builder
+    public ChatRoomUser(User user, ChatRoom chatRoom) {
+        this.user = user;
+        this.chatRoom = chatRoom;
+    }
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/entity/Emoji.java

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+package com.hjjang.backend.domain.chat.domain.entity;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public enum Emoji {
+    SMILE("스마일", "스마일 이모지 url 입니다."),
+    CRY("울음", "울음 이모지 url 입니다."),
+    MAD("화남", "화남 이모지 url 입니다.");
+
+    private final String name;
+    private final String url;
+
+
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/entity/EntranceChatRoom.java

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+package com.hjjang.backend.domain.chat.domain.entity;
+
+import com.hjjang.backend.domain.user.entity.User;
+import com.hjjang.backend.global.domain.BaseCreatedTimeEntity;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Getter
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Table(name = "chat_room_entrance")
+public class EntranceChatRoom extends BaseCreatedTimeEntity {
+    // 채팅 방 목록을 조회할 때 사용하는 조회용 테이블
+    // 장점
+    // 1. 마지막 보낸 메시지 join 없이 찾기 가능
+    // 2. 별도의 join 없이 사용자 id로 바로 찾을 수 있음
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "id")
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "chat_room_id")
+    private ChatRoom chatRoom;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "last_chat_message_id")
+    private ChatMessage lastChatMessage;
+
+    @Builder
+    public EntranceChatRoom(ChatRoom chatRoom, User user, ChatMessage lastChatMessage) {
+        this.chatRoom = chatRoom;
+        this.user = user;
+        this.lastChatMessage = lastChatMessage;
+    }
+
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/repository/ChatMessageEmojiRepository.java

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+package com.hjjang.backend.domain.chat.domain.repository;
+
+import com.hjjang.backend.domain.chat.domain.entity.ChatMessageEmoji;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ChatMessageEmojiRepository extends JpaRepository<ChatMessageEmoji, Long> {
+
+}

backend/src/main/java/com/hjjang/backend/domain/chat/domain/repository/ChatMessageImageRepository.java

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+package com.hjjang.backend.domain.chat.domain.repository;
+
+import com.hjjang.backend.domain.chat.domain.entity.ChatMessageImage;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ChatMessageImageRepository extends JpaRepository<ChatMessageImage, Long> {
+
+
+}