Api: ✨ Implementing Chatroom Join API: A Bounded Context Approach

pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/chat/api/ChatMemberApi.java

@@ -0,0 +1,45 @@
+package kr.co.pennyway.api.apis.chat.api;
+
+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.enums.ParameterIn;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
+import io.swagger.v3.oas.annotations.media.SchemaProperty;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import kr.co.pennyway.api.apis.chat.dto.ChatMemberReq;
+import kr.co.pennyway.api.apis.chat.dto.ChatRoomRes;
+import kr.co.pennyway.api.common.annotation.ApiExceptionExplanation;
+import kr.co.pennyway.api.common.annotation.ApiResponseExplanations;
+import kr.co.pennyway.api.common.security.authentication.SecurityUserDetails;
+import kr.co.pennyway.domain.domains.chatroom.exception.ChatRoomErrorCode;
+import kr.co.pennyway.domain.domains.member.exception.ChatMemberErrorCode;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+
+@Tag(name = "[채팅방 멤버 API]")
+public interface ChatMemberApi {
+    @Operation(summary = "채팅방 멤버 가입", method = "POST", description = "채팅방에 멤버로 가입한다.")
+    @Parameters({
+            @Parameter(name = "chatRoomId", description = "채팅방 ID", required = true, in = ParameterIn.PATH),
+            @Parameter(name = "payload", description = "채팅방 멤버 가입 요청 DTO", required = true, in = ParameterIn.DEFAULT, schema = @Schema(implementation = ChatMemberReq.Join.class))
+    })
+    @ApiResponse(responseCode = "200", description = "채팅방 멤버 가입 성공", content = @Content(schemaProperties = @SchemaProperty(name = "chatRoom", schema = @Schema(implementation = ChatRoomRes.Detail.class))))
+    @ApiResponseExplanations(errors = {
+            @ApiExceptionExplanation(value = ChatRoomErrorCode.class, constant = "INVALID_PASSWORD", summary = "비밀번호가 일치하지 않음", description = "비밀번호가 일치하지 않아 채팅방 멤버 가입에 실패했습니다."),
+            @ApiExceptionExplanation(value = ChatRoomErrorCode.class, constant = "NOT_FOUND_CHAT_ROOM", summary = "채팅방을 찾을 수 없음", description = "채팅방을 찾을 수 없어 채팅방 멤버 가입에 실패했습니다."),
+            @ApiExceptionExplanation(value = ChatRoomErrorCode.class, constant = "FULL_CHAT_ROOM", summary = "채팅방이 가득 참", description = "채팅방이 가득 차서 채팅방 멤버 가입에 실패했습니다."),
+            @ApiExceptionExplanation(value = ChatMemberErrorCode.class, constant = "BANNED", summary = "차단된 사용자", description = "차단된 사용자로 채팅방 멤버 가입에 실패했습니다."),
+            @ApiExceptionExplanation(value = ChatMemberErrorCode.class, constant = "ALREADY_JOINED", summary = "이미 가입한 사용자", description = "이미 가입한 사용자로 채팅방 멤버 가입에 실패했습니다.")
+    })
+    ResponseEntity<?> joinChatRoom(
+            @PathVariable("chatRoomId") Long chatRoomId,
+            @Validated @RequestBody ChatMemberReq.Join payload,
+            @AuthenticationPrincipal SecurityUserDetails user
+    );
+}

pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/chat/controller/ChatMemberController.java

@@ -0,0 +1,37 @@
+package kr.co.pennyway.api.apis.chat.controller;
+
+import kr.co.pennyway.api.apis.chat.api.ChatMemberApi;
+import kr.co.pennyway.api.apis.chat.dto.ChatMemberReq;
+import kr.co.pennyway.api.apis.chat.dto.ChatRoomRes;
+import kr.co.pennyway.api.apis.chat.usecase.ChatMemberUseCase;
+import kr.co.pennyway.api.common.response.SuccessResponse;
+import kr.co.pennyway.api.common.security.authentication.SecurityUserDetails;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.*;
+
+@Slf4j
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/v2/chat-rooms/{chatRoomId}/chat-members")
+public class ChatMemberController implements ChatMemberApi {
+    private static final String CHAT_ROOM = "chatRoom";
+    private final ChatMemberUseCase chatMemberUseCase;
+
+    @Override
+    @PostMapping("")
+    @PreAuthorize("isAuthenticated()")
+    public ResponseEntity<?> joinChatRoom(
+            @PathVariable("chatRoomId") Long chatRoomId,
+            @Validated @RequestBody ChatMemberReq.Join payload,
+            @AuthenticationPrincipal SecurityUserDetails user
+    ) {
+        ChatRoomRes.Detail detail = chatMemberUseCase.joinChatRoom(user.getUserId(), chatRoomId, payload.password());
+
+        return ResponseEntity.ok(SuccessResponse.from(CHAT_ROOM, detail));
+    }
+}

pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/chat/dto/ChatMemberReq.java

@@ -0,0 +1,30 @@
+package kr.co.pennyway.api.apis.chat.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.Pattern;
+
+public final class ChatMemberReq {
+    @Schema(title = "채팅방 멤버 가입 요청 DTO")
+    public static class Join {
+        @Schema(description = "채팅방 비밀번호. NULL을 허용한다. 비밀번호는 6자리 정수만 허용", example = "123456")
+        @Pattern(regexp = "^[0-9]{6}$", message = "채팅방 비밀번호는 6자리 정수여야 합니다.")
+        private String password;
+
+        protected Join() {
+        }
+
+        public Join(String password) {
+            this.password = password;
+        }
+
+        // 메서드 표현 일관성을 유지하고, password를 Integer로 변환하여 반환하는 getter
+        public Integer password() {
+            return password != null ? Integer.valueOf(password) : null;
+        }
+
+        // Swagger UI에서 표현하기 위한 getter
+        public String getPassword() {
+            return password;
+        }
+    }
+}

pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/chat/service/ChatMemberJoinService.java

@@ -0,0 +1,68 @@
+package kr.co.pennyway.api.apis.chat.service;
+
+import kr.co.pennyway.domain.common.redisson.DistributedLock;
+import kr.co.pennyway.domain.domains.chatroom.domain.ChatRoom;
+import kr.co.pennyway.domain.domains.chatroom.exception.ChatRoomErrorCode;
+import kr.co.pennyway.domain.domains.chatroom.exception.ChatRoomErrorException;
+import kr.co.pennyway.domain.domains.chatroom.service.ChatRoomService;
+import kr.co.pennyway.domain.domains.member.domain.ChatMember;
+import kr.co.pennyway.domain.domains.member.service.ChatMemberService;
+import kr.co.pennyway.domain.domains.user.domain.User;
+import kr.co.pennyway.domain.domains.user.exception.UserErrorCode;
+import kr.co.pennyway.domain.domains.user.exception.UserErrorException;
+import kr.co.pennyway.domain.domains.user.service.UserService;
+import kr.co.pennyway.infra.common.event.ChatRoomJoinEvent;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.tuple.Pair;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.stereotype.Service;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class ChatMemberJoinService {
+    private static final long MAX_MEMBER_COUNT = 300;
+
+    private final UserService userService;
+    private final ChatRoomService chatRoomService;
+    private final ChatMemberService chatMemberService;
+
+    private final ApplicationEventPublisher eventPublisher;
+
+    /**
+     * 사용자가 채팅방에 참여하는 도메인 비즈니스 로직을 처리한다.
+     * 채팅방 가입 가능 여부 확인을 위해 현재 가입한 회원 수를 조회하는데, 이 때 분산 락을 걸어 동시성 문제를 해결한다.
+     *
+     * @param userId     Long : 가입하려는 사용자의 ID
+     * @param chatRoomId Long : 가입하려는 채팅방의 ID
+     * @param password   Integer : 비공개 채팅방의 경우 비밀번호 정보를 입력받으며, 채팅방에 비밀번호가 없을 경우 null
+     * @return Pair<ChatRoom, Integer> - 채팅방 정보와 현재 가입한 회원 수
+     */
+    @DistributedLock(key = "'chat-room-join-' + #chatRoomId")
+    public Pair<ChatRoom, Integer> execute(Long userId, Long chatRoomId, Integer password) {
+        ChatRoom chatRoom = chatRoomService.readChatRoom(chatRoomId).orElseThrow(() -> new ChatRoomErrorException(ChatRoomErrorCode.NOT_FOUND_CHAT_ROOM));
+
+        Long currentMemberCount = chatMemberService.countActiveMembers(chatRoomId);
+        if (isFullRoom(currentMemberCount)) {
+            log.warn("채팅방이 가득 찼습니다. chatRoomId: {}", chatRoomId);
+            throw new ChatRoomErrorException(ChatRoomErrorCode.FULL_CHAT_ROOM);
+        }
+
+        if (chatRoom.isPrivateRoom() && !chatRoom.matchPassword(password)) {
+            log.warn("채팅방 비밀번호가 일치하지 않습니다. chatRoomId: {}", chatRoomId);
+            throw new ChatRoomErrorException(ChatRoomErrorCode.INVALID_PASSWORD);
+        }
+
+        User user = userService.readUser(userId).orElseThrow(() -> new UserErrorException(UserErrorCode.NOT_FOUND));
+        ChatMember member = chatMemberService.createMember(user, chatRoom);
+
+        eventPublisher.publishEvent(ChatRoomJoinEvent.of(chatRoomId, member.getName()));
+
+        return Pair.of(chatRoom, currentMemberCount.intValue() + 1);
+    }
+
+    private boolean isFullRoom(Long currentMemberCount) {
+        return currentMemberCount >= MAX_MEMBER_COUNT;
+    }
+}

pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/chat/service/ChatRoomSaveService.java

@@ -4,9 +4,7 @@
 import kr.co.pennyway.api.common.storage.AwsS3Adapter;
 import kr.co.pennyway.domain.domains.chatroom.domain.ChatRoom;
 import kr.co.pennyway.domain.domains.chatroom.service.ChatRoomService;
-import kr.co.pennyway.domain.domains.member.domain.ChatMember;
 import kr.co.pennyway.domain.domains.member.service.ChatMemberService;
-import kr.co.pennyway.domain.domains.member.type.ChatMemberRole;
 import kr.co.pennyway.domain.domains.user.domain.User;
 import kr.co.pennyway.domain.domains.user.exception.UserErrorCode;
 import kr.co.pennyway.domain.domains.user.exception.UserErrorException;
@@ -40,9 +38,7 @@ public ChatRoom createChatRoom(ChatRoomReq.Create request, Long userId) {
         ChatRoom chatRoom = chatRoomService.create(request.toEntity(chatRoomId, originImageUrl));
 
         User user = userService.readUser(userId).orElseThrow(() -> new UserErrorException(UserErrorCode.NOT_FOUND));
-        ChatMember member = ChatMember.of(user.getName(), user, chatRoom, ChatMemberRole.ADMIN);
-
-        chatMemberService.create(member);
+        chatMemberService.createAdmin(user, chatRoom);
 
         return chatRoom;
     }

pennyway-app-external-api/src/main/java/kr/co/pennyway/api/apis/chat/usecase/ChatMemberUseCase.java

@@ -0,0 +1,23 @@
+package kr.co.pennyway.api.apis.chat.usecase;
+
+import kr.co.pennyway.api.apis.chat.dto.ChatRoomRes;
+import kr.co.pennyway.api.apis.chat.mapper.ChatRoomMapper;
+import kr.co.pennyway.api.apis.chat.service.ChatMemberJoinService;
+import kr.co.pennyway.common.annotation.UseCase;
+import kr.co.pennyway.domain.domains.chatroom.domain.ChatRoom;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.tuple.Pair;
+
+@Slf4j
+@UseCase
+@RequiredArgsConstructor
+public class ChatMemberUseCase {
+    private final ChatMemberJoinService chatMemberJoinService;
+
+    public ChatRoomRes.Detail joinChatRoom(Long userId, Long chatRoomId, Integer password) {
+        Pair<ChatRoom, Integer> chatRoom = chatMemberJoinService.execute(userId, chatRoomId, password);
+
+        return ChatRoomMapper.toChatRoomResDetail(chatRoom.getLeft(), false, chatRoom.getRight());
+    }
+}

pennyway-app-external-api/src/main/java/kr/co/pennyway/api/config/InfraConfig.java

@@ -19,7 +19,8 @@
 @EnablePennywayInfraConfig({
         PennywayInfraConfigGroup.FCM,
         PennywayInfraConfigGroup.DISTRIBUTED_COORDINATION_CONFIG,
-        PennywayInfraConfigGroup.GUID_GENERATOR_CONFIG
+        PennywayInfraConfigGroup.GUID_GENERATOR_CONFIG,
+        PennywayInfraConfigGroup.MESSAGE_BROKER_CONFIG
 })
 public class InfraConfig {
 }

pennyway-app-external-api/src/main/resources/application.yml

@@ -13,6 +13,10 @@ jwt:
     access-token: ${JWT_ACCESS_EXPIRATION_TIME:1800000} # 30m (30 * 60 * 1000)
     refresh-token: ${JWT_REFRESH_EXPIRATION_TIME:604800000} # 7d (7 * 24 * 60 * 60 * 1000)
 
+pennyway:
+  rabbitmq:
+    validate-connection: true
+
 ---
 spring:
   config:

pennyway-app-external-api/src/test/java/kr/co/pennyway/api/apis/chat/controller/ChatRoomSaveControllerUnitTest.java

@@ -50,7 +50,7 @@ void setUp(WebApplicationContext webApplicationContext) {
     @WithSecurityMockUser
     void createChatRoomSuccess() throws Exception {
         // given
-        ChatRoom fixture = ChatRoomFixture.PRIVATE_CHAT_ROOM.toEntity();
+        ChatRoom fixture = ChatRoomFixture.PRIVATE_CHAT_ROOM.toEntity(1L);
         ChatRoomReq.Create request = ChatRoomFixture.PRIVATE_CHAT_ROOM.toCreateRequest();
         given(chatRoomUseCase.createChatRoom(request, 1L)).willReturn(ChatRoomRes.Detail.from(fixture, true, 1));
 
@@ -67,7 +67,7 @@ void createChatRoomSuccess() throws Exception {
     @WithSecurityMockUser
     void createChatRoomSuccessWithNullBackgroundImageUrl() throws Exception {
         // given
-        ChatRoom fixture = ChatRoomFixture.PUBLIC_CHAT_ROOM.toEntity();
+        ChatRoom fixture = ChatRoomFixture.PUBLIC_CHAT_ROOM.toEntity(1L);
         ChatRoomReq.Create request = ChatRoomFixture.PUBLIC_CHAT_ROOM.toCreateRequest();
 
         given(chatRoomUseCase.createChatRoom(request, 1L)).willReturn(ChatRoomRes.Detail.from(fixture, true, 1));