feat: 게스트 로그인 클라측에서 지정받은 id를 기반으로 생성할수 있게 수정

packages/backend/gameserver/src/auth/auth.controller.ts

@@ -1,12 +1,15 @@
-import { Controller, Get } from '@nestjs/common';
+import { Controller, Get, Query } from '@nestjs/common';
 import { AuthService } from './auth.service';
 
 @Controller('auth')
 export class AuthController {
   constructor(private readonly authService: AuthService) {}
 
   @Get('guest-login')
-  guestLogin(): { userId: string; password: string } {
-    return this.authService.guestLogin();
+  guestLogin(@Query('userId') userId: string): {
+    userId: string;
+    password: string;
+  } {
+    return this.authService.guestLogin(userId || '게스트');
   }
 }

packages/backend/gameserver/src/auth/auth.service.ts

@@ -1,20 +1,22 @@
 import { Injectable } from '@nestjs/common';
 import { v4 as uuidv4 } from 'uuid';
 
-interface GuestCredentials {
-  userId: string;
-  password: string;
-}
-
 @Injectable()
 export class AuthService {
   private guestSessions: Map<string, string> = new Map();
-  private guestCounter: number = 1;
+  private userCounters: Map<string, number> = new Map();
 
-  guestLogin(): GuestCredentials {
-    const userId = `게스트_${this.guestCounter++}`;
-    const password = uuidv4();
+  guestLogin(requestedUserId: string): { userId: string; password: string } {
+    let userId = requestedUserId;
 
+    // 이미 존재하는 userId인 경우 카운터를 증가시켜 새로운 userId 생성
+    if (this.guestSessions.has(userId)) {
+      const counter = (this.userCounters.get(requestedUserId) || 1) + 1;
+      this.userCounters.set(requestedUserId, counter);
+      userId = `${requestedUserId}_${counter}`;
+    }
+
+    const password = uuidv4();
     this.guestSessions.set(userId, password);
     return { userId, password };
   }