86 lines
2.9 KiB
Python
86 lines
2.9 KiB
Python
import hashlib
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import secrets
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from datetime import UTC, datetime, timedelta
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from argon2 import PasswordHasher
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from argon2.exceptions import InvalidHashError, VerificationError
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from fastapi import Cookie, Depends, HTTPException, Request, Response, status
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from .config import get_settings
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from .db import get_db
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from .models import Session, User
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password_hasher = PasswordHasher()
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COOKIE_NAME = "dodo_session"
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CSRF_COOKIE_NAME = "dodo_csrf"
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def hash_token(token: str) -> str:
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return hashlib.sha256(token.encode()).hexdigest()
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def hash_password(password: str) -> str:
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return password_hasher.hash(password)
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def verify_password(password_hash: str, password: str) -> bool:
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try:
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return password_hasher.verify(password_hash, password)
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except (InvalidHashError, VerificationError):
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return False
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async def issue_session(db: AsyncSession, response: Response, user: User, request: Request | None = None) -> None:
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token = secrets.token_urlsafe(32)
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csrf = secrets.token_urlsafe(24)
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expires = datetime.now(UTC) + timedelta(days=get_settings().session_days)
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db.add(Session(
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token_hash=hash_token(token), user_id=user.id, expires_at=expires,
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ip_address=request.client.host if request and request.client else None,
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user_agent=request.headers.get("user-agent", "")[:500] if request else None,
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))
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await db.commit()
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response.set_cookie(
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COOKIE_NAME, token, max_age=get_settings().session_days * 86400,
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httponly=True, secure=get_settings().cookie_secure, samesite="lax", path="/",
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)
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response.set_cookie(
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CSRF_COOKIE_NAME, csrf, max_age=get_settings().session_days * 86400,
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httponly=False, secure=get_settings().cookie_secure, samesite="lax", path="/",
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)
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async def session_token(
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token: str | None = Cookie(default=None, alias=COOKIE_NAME),
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) -> str:
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if not token:
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raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="请先登录")
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return token
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async def current_user(
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token: str = Depends(session_token),
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db: AsyncSession = Depends(get_db),
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) -> User:
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result = await db.execute(
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select(User).join(Session).where(
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Session.token_hash == hash_token(token), Session.expires_at > datetime.now(UTC)
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)
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)
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user = result.scalar_one_or_none()
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if user is None:
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raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="会话已失效，请重新登录")
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return user
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async def current_session(
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token: str = Depends(session_token),
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db: AsyncSession = Depends(get_db),
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) -> Session:
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row = await db.scalar(select(Session).where(Session.token_hash == hash_token(token), Session.expires_at > datetime.now(UTC)))
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if row is None:
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raise HTTPException(status_code=401, detail="会话已失效，请重新登录")
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return row
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