from typing import Optional
from pydantic import BaseModel


class LoginRequest(BaseModel):
    """登录请求模型"""
    username: str
    password: str


class LoginResponse(BaseModel):
    """登录响应模型"""
    access_token: str
    refresh_token: str
    token_type: str = "bearer"
    expires_in: int


class RefreshTokenRequest(BaseModel):
    """刷新Token请求模型"""
    refresh_token: str


class TokenData(BaseModel):
    """Token数据模型"""
    username: Optional[str] = None