family update

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
+    };
+  }
+}