family update

2026-06-24 23:17:24 +03:00
parent 9727cf3f35
commit f2366a69a0
18 changed files with 1374 additions and 103 deletions
--- a/apps/sso-core/prisma/schema.prisma
+++ b/apps/sso-core/prisma/schema.prisma
@@ -384,8 +384,10 @@ model ChatRoomMember {
  id                 String   @id @default(uuid())
  roomId             String
  userId             String
-  notificationsMuted Boolean  @default(false)
-  joinedAt           DateTime @default(now())
+  notificationsMuted Boolean   @default(false)
+  lastReadAt         DateTime?
+  lastReadMessageId  String?
+  joinedAt           DateTime  @default(now())
  room               ChatRoom @relation(fields: [roomId], references: [id], onDelete: Cascade)
  user               User     @relation(fields: [userId], references: [id], onDelete: Cascade)

@@ -404,6 +406,7 @@ model ChatMessage {
  mimeType   String?
  createdAt  DateTime   @default(now())
  editedAt   DateTime?
+  deletedAt  DateTime?
  room       ChatRoom   @relation(fields: [roomId], references: [id], onDelete: Cascade)
  sender     User       @relation(fields: [senderId], references: [id], onDelete: Cascade)
  poll       ChatPoll?
--- a/apps/sso-core/src/app.module.ts
+++ b/apps/sso-core/src/app.module.ts
@@ -26,6 +26,7 @@ import { FamilyService } from './domain/family.service';
 import { MediaService } from './domain/media.service';
 import { NotificationsService } from './domain/notifications.service';
 import { ChatService } from './domain/chat.service';
+import { PresenceService } from './domain/presence.service';
 import { NotificationPublisherService } from './infra/notification-publisher.service';
 import { MinioService } from './infra/minio.service';
 import { LdapClientService } from './infra/ldap-client.service';
@@ -63,6 +64,7 @@ import { TotpService } from './domain/totp.service';
    MediaService,
    NotificationsService,
    ChatService,
+    PresenceService,
    NotificationPublisherService,
    MinioService,
    LdapClientService,
--- a/apps/sso-core/src/domain/auth-grpc.controller.ts
+++ b/apps/sso-core/src/domain/auth-grpc.controller.ts
@@ -20,6 +20,7 @@ import { FamilyService } from './family.service';
 import { MediaService } from './media.service';
 import { NotificationsService } from './notifications.service';
 import { ChatService } from './chat.service';
+import { PresenceService } from './presence.service';
 import { TotpService } from './totp.service';
 import { MessagingService } from '../infra/messaging.service';

@@ -44,6 +45,7 @@ export class AuthGrpcController {
    private readonly media: MediaService,
    private readonly notifications: NotificationsService,
    private readonly chat: ChatService,
+    private readonly presence: PresenceService,
    private readonly messaging: MessagingService,
    private readonly totp: TotpService
  ) {}
@@ -624,6 +626,21 @@ export class AuthGrpcController {
    return this.media.getChatMediaAccessUrl(command.requesterId, command.roomId, command.storageKey, command.fileName);
  }

+  @GrpcMethod('MediaService', 'CreateChatRoomAvatarUploadUrl')
+  createChatRoomAvatarUploadUrl(command: { requesterId: string; roomId: string; contentType: string }) {
+    return this.media.createChatRoomAvatarUploadUrl(command.requesterId, command.roomId, command.contentType);
+  }
+
+  @GrpcMethod('MediaService', 'ConfirmChatRoomAvatar')
+  confirmChatRoomAvatar(command: { requesterId: string; roomId: string; storageKey: string }) {
+    return this.media.confirmChatRoomAvatar(command.requesterId, command.roomId, command.storageKey);
+  }
+
+  @GrpcMethod('MediaService', 'GetChatRoomAvatarAccessUrl')
+  getChatRoomAvatarAccessUrl(command: { requesterId: string; roomId: string }) {
+    return this.media.getChatRoomAvatarAccessUrl(command.requesterId, command.roomId);
+  }
+
  @GrpcMethod('OAuthCoreService', 'Authorize')
  authorize(command: { userId: string; clientId: string; redirectUri: string; scope: string; state?: string }) {
    return this.oauthCore.authorize(command);
@@ -738,6 +755,11 @@ export class AuthGrpcController {
    return this.family.listInvites(command.userId, command.groupId);
  }

+  @GrpcMethod('FamilyService', 'GetFamilyPresence')
+  getFamilyPresence(command: { requesterId: string; groupId: string }) {
+    return this.presence.getFamilyPresence(command.requesterId, command.groupId);
+  }
+
  @GrpcMethod('NotificationsService', 'ListNotifications')
  listNotifications(command: { userId: string; limit?: number; unreadOnly?: boolean }) {
    return this.notifications.list(command.userId, command.limit, command.unreadOnly);
@@ -783,6 +805,16 @@ export class AuthGrpcController {
    return this.chat.updateRoomSettings(command.userId, command.roomId, command.name, command.notificationsMuted);
  }

+  @GrpcMethod('ChatService', 'AddRoomMember')
+  addChatRoomMember(command: { userId: string; roomId: string; memberUserId: string }) {
+    return this.chat.addRoomMember(command.userId, command.roomId, command.memberUserId);
+  }
+
+  @GrpcMethod('ChatService', 'RemoveRoomMember')
+  removeChatRoomMember(command: { userId: string; roomId: string; memberUserId: string }) {
+    return this.chat.removeRoomMember(command.userId, command.roomId, command.memberUserId);
+  }
+
  @GrpcMethod('ChatService', 'ListMessages')
  listChatMessages(command: { userId: string; roomId: string; beforeMessageId?: string; limit?: number }) {
    return this.chat.listMessages(command.userId, command.roomId, command.beforeMessageId, command.limit);
@@ -823,6 +855,21 @@ export class AuthGrpcController {
    return this.chat.setRoomNotificationsMuted(command.userId, command.roomId, command.muted);
  }

+  @GrpcMethod('ChatService', 'EditMessage')
+  editChatMessage(command: { userId: string; messageId: string; content: string }) {
+    return this.chat.editMessage(command.userId, command.messageId, command.content);
+  }
+
+  @GrpcMethod('ChatService', 'DeleteMessage')
+  deleteChatMessage(command: { userId: string; messageId: string }) {
+    return this.chat.deleteMessage(command.userId, command.messageId);
+  }
+
+  @GrpcMethod('ChatService', 'MarkRoomRead')
+  markChatRoomRead(command: { userId: string; roomId: string; lastMessageId?: string }) {
+    return this.chat.markRoomRead(command.userId, command.roomId, command.lastMessageId);
+  }
+
  private toSessionResponse(session: { id: string; userId: string; deviceId: string | null; pinVerified: boolean; status: string; ipAddress: string | null; userAgent: string | null; expiresAt: Date; createdAt: Date; updatedAt: Date }) {
    return {
      id: session.id,
--- a/apps/sso-core/src/domain/chat.service.ts
+++ b/apps/sso-core/src/domain/chat.service.ts
@@ -10,6 +10,11 @@ interface PollPayload {
  isAnonymous?: boolean;
 }

+interface ReadContextMember {
+  userId: string;
+  lastReadAt: Date | null;
+}
+
@Injectable()
 export class ChatService {
  constructor(
@@ -51,27 +56,18 @@ export class ChatService {
      orderBy: [{ type: 'asc' }, { updatedAt: 'desc' }]
    });

+    const familyMembers = await this.prisma.familyMember.findMany({ where: { groupId } });
+    const familyRoleByUserId = new Map(familyMembers.map((member) => [member.userId, member.role]));
+
    return {
      rooms: await Promise.all(
        rooms.map(async (room) => {
-          const membership = room.members.find((member) => member.userId === userId);
          const lastMessage = room.messages[0];
-          return {
-            id: room.id,
-            groupId: room.groupId,
-            type: room.type,
-            name: room.name,
-            hasAvatar: room.hasAvatar,
-            updatedAt: room.updatedAt.toISOString(),
-            members: room.members.map((member) => ({
-              id: member.id,
-              userId: member.userId,
-              displayName: member.user.displayName,
-              hasAvatar: Boolean(member.user.avatarStorageKey),
-              notificationsMuted: member.notificationsMuted
-            })),
-            lastMessage: lastMessage ? await this.toMessage(lastMessage, userId) : undefined
-          };
+          return this.formatRoom(
+            room,
+            familyRoleByUserId,
+            lastMessage ? await this.toMessage(lastMessage, userId, await this.getRoomReadContext(room.id)) : undefined
+          );
        })
      )
    };
@@ -107,21 +103,61 @@ export class ChatService {
      }
    });

-    return {
-      id: room.id,
-      groupId: room.groupId,
-      type: room.type,
-      name: room.name,
-      hasAvatar: room.hasAvatar,
-      updatedAt: room.updatedAt.toISOString(),
-      members: room.members.map((member) => ({
-        id: member.id,
-        userId: member.userId,
-        displayName: member.user.displayName,
-        hasAvatar: Boolean(member.user.avatarStorageKey),
-        notificationsMuted: member.notificationsMuted
-      }))
-    };
+    const familyMembers = await this.prisma.familyMember.findMany({ where: { groupId } });
+    const familyRoleByUserId = new Map(familyMembers.map((member) => [member.userId, member.role]));
+
+    return this.formatRoom(room, familyRoleByUserId);
+  }
+
+  async addRoomMember(userId: string, roomId: string, memberUserId: string) {
+    const room = await this.getRoomForMember(roomId, userId);
+    if (room.type === 'GENERAL') {
+      throw new BadRequestException('В общий чат нельзя добавлять участников вручную');
+    }
+    if (room.members.some((member) => member.userId === memberUserId)) {
+      throw new BadRequestException('Пользователь уже состоит в чате');
+    }
+    if (!room.group.members.some((member) => member.userId === memberUserId)) {
+      throw new BadRequestException('Пользователь должен состоять в семье');
+    }
+
+    await this.prisma.chatRoomMember.create({
+      data: { roomId, userId: memberUserId }
+    });
+
+    return this.getRoomResponse(roomId, userId);
+  }
+
+  async removeRoomMember(userId: string, roomId: string, memberUserId: string) {
+    const room = await this.getRoomForMember(roomId, userId);
+    if (room.type === 'GENERAL') {
+      throw new BadRequestException('Нельзя удалить участника из общего чата');
+    }
+
+    const isFamilyOwner = room.group.ownerId === userId;
+    const isChatCreator = room.createdById === userId;
+    if (!isFamilyOwner && !isChatCreator) {
+      throw new ForbiddenException('Недостаточно прав для удаления участника из чата');
+    }
+
+    if (memberUserId === room.createdById && !isFamilyOwner) {
+      throw new BadRequestException('Создателя чата может удалить только создатель семьи');
+    }
+
+    if (memberUserId === userId && room.members.length <= 1) {
+      throw new BadRequestException('В чате должен остаться хотя бы один участник');
+    }
+
+    const membership = room.members.find((member) => member.userId === memberUserId);
+    if (!membership) {
+      throw new NotFoundException('Участник не найден в этом чате');
+    }
+
+    await this.prisma.chatRoomMember.delete({
+      where: { roomId_userId: { roomId, userId: memberUserId } }
+    });
+
+    return this.getRoomResponse(roomId, userId);
  }

  async updateRoomSettings(userId: string, roomId: string, name?: string, notificationsMuted?: boolean) {
@@ -148,6 +184,7 @@ export class ChatService {
  async listMessages(userId: string, roomId: string, beforeMessageId?: string, limit = 50) {
    await this.getRoomForMember(roomId, userId);
    const take = Math.min(Math.max(limit, 1), 100);
+    const readContext = await this.getRoomReadContext(roomId);

    let cursorDate: Date | undefined;
    if (beforeMessageId) {
@@ -170,7 +207,7 @@ export class ChatService {

    const ordered = messages.reverse();
    return {
-      messages: await Promise.all(ordered.map((message) => this.toMessage(message, userId)))
+      messages: await Promise.all(ordered.map((message) => this.toMessage(message, userId, readContext)))
    };
  }

@@ -255,11 +292,93 @@ export class ChatService {
      }
    });

-    const response = await this.toMessage(fullMessage!, userId);
+    const readContext = await this.getRoomReadContext(roomId);
+    const response = await this.toMessage(fullMessage!, userId, readContext);
    await this.notifyRoomMembers(room, userId, response);
    return response;
  }

+  async editMessage(userId: string, messageId: string, content: string) {
+    const message = await this.prisma.chatMessage.findUnique({
+      where: { id: messageId },
+      include: { room: { include: { members: true } } }
+    });
+    if (!message || message.deletedAt) {
+      throw new NotFoundException('Сообщение не найдено');
+    }
+    if (message.senderId !== userId) {
+      throw new ForbiddenException('Можно редактировать только свои сообщения');
+    }
+    if (!['TEXT', 'EMOJI'].includes(message.type)) {
+      throw new BadRequestException('Этот тип сообщения нельзя редактировать');
+    }
+
+    const trimmed = content.trim();
+    if (!trimmed) {
+      throw new BadRequestException('Сообщение не может быть пустым');
+    }
+
+    await this.prisma.chatMessage.update({
+      where: { id: messageId },
+      data: { content: trimmed, editedAt: new Date() }
+    });
+
+    const response = await this.loadMessageResponse(messageId, userId);
+    await this.publishRoomEvent(message.room, 'chat_message_updated', response);
+    return response;
+  }
+
+  async deleteMessage(userId: string, messageId: string) {
+    const message = await this.prisma.chatMessage.findUnique({
+      where: { id: messageId },
+      include: { room: { include: { members: true } } }
+    });
+    if (!message || message.deletedAt) {
+      throw new NotFoundException('Сообщение не найдено');
+    }
+    if (message.senderId !== userId) {
+      throw new ForbiddenException('Можно удалять только свои сообщения');
+    }
+
+    await this.prisma.chatMessage.update({
+      where: { id: messageId },
+      data: { deletedAt: new Date(), content: null, storageKey: null, mimeType: null, metadata: undefined }
+    });
+
+    const response = await this.loadMessageResponse(messageId, userId);
+    await this.publishRoomEvent(message.room, 'chat_message_deleted', response);
+    return response;
+  }
+
+  async markRoomRead(userId: string, roomId: string, lastMessageId?: string) {
+    const room = await this.getRoomForMember(roomId, userId);
+    let readAt = new Date();
+
+    if (lastMessageId) {
+      const message = await this.prisma.chatMessage.findFirst({ where: { id: lastMessageId, roomId } });
+      if (message) {
+        readAt = message.createdAt;
+      }
+    }
+
+    await this.prisma.chatRoomMember.update({
+      where: { roomId_userId: { roomId, userId } },
+      data: { lastReadAt: readAt, lastReadMessageId: lastMessageId ?? null }
+    });
+
+    for (const member of room.members) {
+      if (member.userId === userId) continue;
+      await this.notifications.publishRealtime(member.userId, 'chat_read_receipt', room.name, '', {
+        roomId,
+        userId,
+        lastReadAt: readAt.toISOString(),
+        lastReadMessageId: lastMessageId
+      });
+    }
+
+    return { count: 1 };
+  }
+
  async votePoll(userId: string, messageId: string, optionIds: string[]) {
    const message = await this.prisma.chatMessage.findUnique({
      where: { id: messageId },
@@ -302,7 +421,7 @@ export class ChatService {
        poll: { include: { options: { include: { votes: true } } } }
      }
    });
-    return this.toMessage(updated!, userId);
+    return this.toMessage(updated!, userId, await this.getRoomReadContext(updated!.roomId));
  }

  async setRoomNotificationsMuted(userId: string, roomId: string, muted: boolean) {
@@ -335,27 +454,88 @@ export class ChatService {
    return room;
  }

+  private formatRoom(
+    room: {
+      id: string;
+      groupId: string;
+      type: string;
+      name: string;
+      hasAvatar: boolean;
+      updatedAt: Date;
+      createdById: string | null;
+      members: Array<{
+        id: string;
+        userId: string;
+        notificationsMuted: boolean;
+        user: { displayName: string; avatarStorageKey: string | null };
+      }>;
+    },
+    familyRoleByUserId: Map<string, string>,
+    lastMessage?: Awaited<ReturnType<ChatService['toMessage']>>
+  ) {
+    return {
+      id: room.id,
+      groupId: room.groupId,
+      type: room.type,
+      name: room.name,
+      hasAvatar: room.hasAvatar,
+      createdById: room.createdById ?? undefined,
+      updatedAt: room.updatedAt.toISOString(),
+      members: room.members.map((member) => ({
+        id: member.id,
+        userId: member.userId,
+        displayName: member.user.displayName,
+        hasAvatar: Boolean(member.user.avatarStorageKey),
+        notificationsMuted: member.notificationsMuted,
+        familyRole: familyRoleByUserId.get(member.userId) ?? 'member',
+        isChatCreator: room.createdById === member.userId
+      })),
+      lastMessage
+    };
+  }
+
  private async getRoomResponse(roomId: string, userId: string) {
    const room = await this.getRoomForMember(roomId, userId);
    const full = await this.prisma.chatRoom.findUnique({
      where: { id: roomId },
      include: { members: { include: { user: true } } }
    });
-    return {
-      id: full!.id,
-      groupId: full!.groupId,
-      type: full!.type,
-      name: full!.name,
-      hasAvatar: full!.hasAvatar,
-      updatedAt: full!.updatedAt.toISOString(),
-      members: full!.members.map((member) => ({
-        id: member.id,
-        userId: member.userId,
-        displayName: member.user.displayName,
-        hasAvatar: Boolean(member.user.avatarStorageKey),
-        notificationsMuted: member.notificationsMuted
-      }))
-    };
+    const familyMembers = await this.prisma.familyMember.findMany({ where: { groupId: full!.groupId } });
+    const familyRoleByUserId = new Map(familyMembers.map((member) => [member.userId, member.role]));
+    return this.formatRoom(full!, familyRoleByUserId);
+  }
+
+  private async getRoomReadContext(roomId: string): Promise<ReadContextMember[]> {
+    const members = await this.prisma.chatRoomMember.findMany({ where: { roomId } });
+    return members.map((member) => ({ userId: member.userId, lastReadAt: member.lastReadAt }));
+  }
+
+  private async loadMessageResponse(messageId: string, viewerId: string) {
+    const message = await this.prisma.chatMessage.findUnique({
+      where: { id: messageId },
+      include: {
+        sender: true,
+        poll: { include: { options: { include: { votes: true } } } }
+      }
+    });
+    if (!message) {
+      throw new NotFoundException('Сообщение не найдено');
+    }
+    const readContext = await this.getRoomReadContext(message.roomId);
+    return this.toMessage(message, viewerId, readContext);
+  }
+
+  private async publishRoomEvent(
+    room: { id: string; name: string; members: Array<{ userId: string }> },
+    eventType: string,
+    message: Awaited<ReturnType<ChatService['toMessage']>>
+  ) {
+    for (const member of room.members) {
+      await this.notifications.publishRealtime(member.userId, eventType, room.name, '', {
+        roomId: room.id,
+        message
+      });
+    }
  }

  private async notifyRoomMembers(
@@ -412,6 +592,8 @@ export class ChatService {
      mimeType: string | null;
      metadata: unknown;
      createdAt: Date;
+      editedAt?: Date | null;
+      deletedAt?: Date | null;
      sender: { displayName: string; avatarStorageKey: string | null };
      poll?: {
        id: string;
@@ -422,8 +604,17 @@ export class ChatService {
        options: Array<{ id: string; text: string; votes: Array<{ userId: string }> }>;
      } | null;
    },
-    viewerId: string
+    viewerId: string,
+    readContext?: ReadContextMember[]
  ) {
+    const isDeleted = Boolean(message.deletedAt);
+    let readByAll = false;
+    if (readContext && message.senderId === viewerId && !isDeleted) {
+      const others = readContext.filter((member) => member.userId !== message.senderId);
+      readByAll =
+        others.length > 0 && others.every((member) => member.lastReadAt && member.lastReadAt >= message.createdAt);
+    }
+
    return {
      id: message.id,
      roomId: message.roomId,
@@ -431,13 +622,16 @@ export class ChatService {
      senderName: message.sender.displayName,
      senderHasAvatar: Boolean(message.sender.avatarStorageKey),
      type: message.type,
-      content: message.content ?? undefined,
+      content: isDeleted ? undefined : message.content ?? undefined,
      replyToId: message.replyToId ?? undefined,
-      storageKey: message.storageKey ?? undefined,
-      mimeType: message.mimeType ?? undefined,
-      metadataJson: message.metadata ? JSON.stringify(message.metadata) : undefined,
+      storageKey: isDeleted ? undefined : message.storageKey ?? undefined,
+      mimeType: isDeleted ? undefined : message.mimeType ?? undefined,
+      metadataJson: isDeleted ? undefined : message.metadata ? JSON.stringify(message.metadata) : undefined,
      createdAt: message.createdAt.toISOString(),
-      poll: message.poll
+      editedAt: message.editedAt?.toISOString(),
+      isDeleted,
+      readByAll: message.senderId === viewerId ? readByAll : undefined,
+      poll: !isDeleted && message.poll
        ? {
            id: message.poll.id,
            question: message.poll.question,
--- a/apps/sso-core/src/domain/media.service.ts
+++ b/apps/sso-core/src/domain/media.service.ts
@@ -128,11 +128,11 @@ export class MediaService {
      throw new ForbiddenException('Ссылка недействительна');
    }

-    if (payload.objectKey.startsWith('chat/')) {
+    if (payload.objectKey.startsWith('chat/') || payload.objectKey.startsWith('chat-rooms/')) {
      if (!requesterId) {
        throw new ForbiddenException('Для доступа к файлу чата требуется авторизация');
      }
-      const roomId = payload.roomId ?? this.extractChatRoomId(payload.objectKey);
+      const roomId = payload.roomId ?? this.extractChatRoomId(payload.objectKey) ?? this.extractChatRoomAvatarRoomId(payload.objectKey);
      if (!roomId) {
        throw new ForbiddenException('Некорректный ключ файла чата');
      }
@@ -238,6 +238,39 @@ export class MediaService {
    return this.createStreamAccessUrl(storageKey, requesterId, { roomId, fileName });
  }

+  async createChatRoomAvatarUploadUrl(requesterId: string, roomId: string, contentType: string) {
+    await this.assertChatMember(roomId, requesterId);
+    try {
+      this.minio.assertImageContentType(contentType);
+    } catch (error) {
+      throw new BadRequestException(error instanceof Error ? error.message : 'Некорректный тип файла');
+    }
+    const extension = this.minio.extensionForContentType(contentType);
+    const storageKey = `chat-rooms/${roomId}/${crypto.randomUUID()}.${extension}`;
+    return this.createUploadTarget(requesterId, storageKey, contentType);
+  }
+
+  async confirmChatRoomAvatar(requesterId: string, roomId: string, storageKey: string) {
+    await this.assertChatMember(roomId, requesterId);
+    if (!storageKey.startsWith(`chat-rooms/${roomId}/`)) {
+      throw new BadRequestException('Некорректный ключ аватара чата');
+    }
+    await this.prisma.chatRoom.update({
+      where: { id: roomId },
+      data: { avatarStorageKey: storageKey, hasAvatar: true }
+    });
+    return { roomId, hasAvatar: true };
+  }
+
+  async getChatRoomAvatarAccessUrl(requesterId: string, roomId: string) {
+    await this.assertChatMember(roomId, requesterId);
+    const room = await this.prisma.chatRoom.findUnique({ where: { id: roomId } });
+    if (!room?.avatarStorageKey) {
+      throw new NotFoundException('Аватар чата не найден');
+    }
+    return this.createStreamAccessUrl(room.avatarStorageKey, requesterId, { roomId });
+  }
+
  private extractChatRoomId(storageKey: string) {
    const [prefix, roomId] = storageKey.split('/');
    if (prefix !== 'chat' || !roomId) {
@@ -246,6 +279,14 @@ export class MediaService {
    return roomId;
  }

+  private extractChatRoomAvatarRoomId(storageKey: string) {
+    const [prefix, roomId] = storageKey.split('/');
+    if (prefix !== 'chat-rooms' || !roomId) {
+      return null;
+    }
+    return roomId;
+  }
+
  private async createUploadTarget(userId: string, storageKey: string, contentType: string) {
    const viaApi = this.config.get<string>('MINIO_UPLOAD_VIA_API', 'true') !== 'false';
    const expiresAt = new Date(Date.now() + UPLOAD_TTL_SECONDS * 1000).toISOString();
--- a/apps/sso-core/src/domain/presence.service.ts
+++ b/apps/sso-core/src/domain/presence.service.ts
@@ -0,0 +1,44 @@
+import { Injectable } from '@nestjs/common';
+import { RedisService } from '../infra/redis.service';
+import { FamilyService } from './family.service';
+
+const ONLINE_KEY_PREFIX = 'ws:user:';
+const LAST_SEEN_KEY_PREFIX = 'ws:last_seen:';
+
+@Injectable()
+export class PresenceService {
+  constructor(
+    private readonly redis: RedisService,
+    private readonly family: FamilyService
+  ) {}
+
+  async isUserOnline(userId: string) {
+    const value = await this.redis.client.get(`${ONLINE_KEY_PREFIX}${userId}`);
+    return value === 'online';
+  }
+
+  async getUserLastSeen(userId: string) {
+    return this.redis.client.get(`${LAST_SEEN_KEY_PREFIX}${userId}`);
+  }
+
+  async getFamilyPresence(requesterId: string, groupId: string) {
+    const group = await this.family.assertFamilyMember(groupId, requesterId);
+    const members = await Promise.all(
+      group.members.map(async (member) => {
+        const online = await this.isUserOnline(member.userId);
+        const lastSeenRaw = online ? null : await this.getUserLastSeen(member.userId);
+        return {
+          userId: member.userId,
+          displayName: member.user.displayName,
+          online,
+          lastSeenAt: online ? new Date().toISOString() : lastSeenRaw ?? undefined
+        };
+      })
+    );
+
+    return {
+      members,
+      onlineCount: members.filter((member) => member.online).length
+    };
+  }
+}