94 lines
2.9 KiB
Python
94 lines
2.9 KiB
Python
from datetime import datetime, timedelta, timezone
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import jwt
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from fastapi.security import OAuth2PasswordBearer
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from models import AccessTokenBase, RefreshTokenBase
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oauth2_scheme = OAuth2PasswordBearer(
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scheme_name='获取 JWT Bearer 令牌',
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description='用于获取 JWT Bearer 令牌，需要以表单的形式提交',
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tokenUrl="/api/v1/user/session",
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refreshUrl="/api/v1/user/session/refresh",
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)
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SECRET_KEY = ''
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async def load_secret_key() -> None:
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"""
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从数据库读取 JWT 的密钥。
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"""
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# 延迟导入以避免循环依赖
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from models.database import get_session
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from models.setting import Setting
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global SECRET_KEY
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async for session in get_session():
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setting = await Setting.get(
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session,
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(Setting.type == "auth") & (Setting.name == "secret_key")
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)
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if setting:
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SECRET_KEY = setting.value
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def build_token_payload(
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data: dict,
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is_refresh: bool,
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algorithm: str,
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expires_delta: timedelta | None = None,
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) -> tuple[str, datetime]:
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"""构建令牌"""
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to_encode = data.copy()
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if is_refresh:
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to_encode.update({"token_type": "refresh"})
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if expires_delta:
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expire = datetime.now(timezone.utc) + expires_delta
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elif is_refresh:
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expire = datetime.now(timezone.utc) + timedelta(days=30)
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else:
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expire = datetime.now(timezone.utc) + timedelta(hours=3)
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to_encode.update({
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"iat": int(datetime.now(timezone.utc).timestamp()),
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"exp": int(expire.timestamp())
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})
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return jwt.encode(to_encode, SECRET_KEY, algorithm=algorithm), expire
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# 访问令牌
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def create_access_token(data: dict, expires_delta: timedelta | None = None, algorithm: str = "HS256") -> AccessTokenBase:
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"""
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生成访问令牌，默认有效期 3 小时。
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:param data: 需要放进 JWT Payload 的字段。
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:param expires_delta: 过期时间, 缺省时为 3 小时。
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:param algorithm: JWT 密钥强度，缺省时为 HS256
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:return: 包含密钥本身和过期时间的 `AccessTokenBase`
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"""
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access_token, expire_at = build_token_payload(data, False, algorithm, expires_delta)
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return AccessTokenBase(
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access_token=access_token,
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access_expires=expire_at,
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)
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# 刷新令牌
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def create_refresh_token(data: dict, expires_delta: timedelta | None = None, algorithm: str = "HS256") -> RefreshTokenBase:
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"""
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生成刷新令牌，默认有效期 30 天。
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:param data: 需要放进 JWT Payload 的字段。
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:param expires_delta: 过期时间, 缺省时为 30 天。
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:param algorithm: JWT 密钥强度，缺省时为 HS256
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:return: 包含密钥本身和过期时间的 `RefreshTokenBase`
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"""
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refresh_token, expire_at = build_token_payload(data, True, algorithm, expires_delta)
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return RefreshTokenBase(
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refresh_token=refresh_token,
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refresh_expires=expire_at,
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) |