service

type GroupService interface {
	Index(ctx context.Context, u *domain.User) ([]*domain.Group, error)
	Show(ctx context.Context, groupID string) (*domain.Group, error)
	Create(ctx context.Context, u *domain.User, g *domain.Group) (*domain.Group, error)
	Update(ctx context.Context, g *domain.Group) error
	InviteUsers(ctx context.Context, g *domain.Group) error
	Join(ctx context.Context, g *domain.Group) error
	IsContainInUserIDs(ctx context.Context, userID string, g *domain.Group) bool
	IsContainInInvitedEmails(ctx context.Context, email string, g *domain.Group) bool
}

type UserService interface {
	Authentication(ctx context.Context) (*domain.User, error)
}