refactor(server): make user core singleton (#4607)

server/src/domain/auth/auth.service.ts

@@ -75,7 +75,7 @@ export class AuthService {
     @Inject(IKeyRepository) private keyRepository: IKeyRepository,
   ) {
     this.configCore = SystemConfigCore.create(configRepository);
-    this.userCore = new UserCore(userRepository, libraryRepository, cryptoRepository);
+    this.userCore = UserCore.create(cryptoRepository, libraryRepository, userRepository);
 
     custom.setHttpOptionsDefaults({ timeout: 30000 });
   }

server/src/domain/user/user.core.ts

@@ -15,13 +15,31 @@ import { ICryptoRepository, ILibraryRepository, IUserRepository, UserListFilter
 
 const SALT_ROUNDS = 10;
 
+let instance: UserCore | null;
+
 export class UserCore {
-  constructor(
-    private userRepository: IUserRepository,
-    private libraryRepository: ILibraryRepository,
+  private constructor(
     private cryptoRepository: ICryptoRepository,
+    private libraryRepository: ILibraryRepository,
+    private userRepository: IUserRepository,
   ) {}
 
+  static create(
+    cryptoRepository: ICryptoRepository,
+    libraryRepository: ILibraryRepository,
+    userRepository: IUserRepository,
+  ) {
+    if (!instance) {
+      instance = new UserCore(cryptoRepository, libraryRepository, userRepository);
+    }
+
+    return instance;
+  }
+
+  static reset() {
+    instance = null;
+  }
+
   async updateUser(authUser: AuthUserDto, id: string, dto: Partial<UserEntity>): Promise<UserEntity> {
     if (!authUser.isAdmin && authUser.id !== id) {
       throw new ForbiddenException('You are not allowed to update this user');

server/src/domain/user/user.service.ts

@@ -45,7 +45,7 @@ export class UserService {
     @Inject(IUserRepository) private userRepository: IUserRepository,
   ) {
     this.storageCore = new StorageCore(storageRepository, assetRepository, moveRepository, personRepository);
-    this.userCore = new UserCore(userRepository, libraryRepository, cryptoRepository);
+    this.userCore = UserCore.create(cryptoRepository, libraryRepository, userRepository);
   }
 
   async getAll(authUser: AuthUserDto, isAll: boolean): Promise<UserResponseDto[]> {