97 lines
3.2 KiB
Python
97 lines
3.2 KiB
Python
import hashlib
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import os
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import uuid
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from datetime import datetime, timedelta, timezone
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from typing import Optional
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from fastapi import Depends, Header, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from bd import make_engine
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SECRET_KEY: str = os.getenv("SECRET_KEY", "")
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if not SECRET_KEY:
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import secrets
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SECRET_KEY = secrets.token_hex(32)
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print("WARNING: SECRET_KEY not set in environment. Using a random key — tokens will be invalidated on restart!")
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "60"))
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/login")
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def _prehash(password: str) -> str:
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"""SHA-256 пред-хеш чтобы обойти 72-байтовый лимит bcrypt."""
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return hashlib.sha256(password.encode()).hexdigest()
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def hash_password(password: str) -> str:
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return pwd_context.hash(_prehash(password))
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def verify_password(plain: str, hashed: str) -> bool:
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return pwd_context.verify(_prehash(plain), hashed)
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def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
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to_encode = data.copy()
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expire = datetime.now(timezone.utc) + (expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
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to_encode["exp"] = expire
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return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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def get_session():
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from sqlalchemy.orm import sessionmaker
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return sessionmaker(bind=make_engine(), future=True)
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def get_current_user(token: str = Depends(oauth2_scheme)):
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"""FastAPI dependency: валидирует Bearer-токен и возвращает объект User."""
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credentials_exc = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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user_id: str = payload.get("sub")
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if user_id is None:
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raise credentials_exc
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except JWTError:
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raise credentials_exc
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from bd.tables.users import User
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try:
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uid = uuid.UUID(user_id)
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except Exception:
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raise credentials_exc
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Session = get_session()
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with Session() as session:
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user = session.get(User, uid)
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if user is None:
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raise credentials_exc
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# detach from session so object can be used outside
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session.expunge(user)
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return user
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def require_admin_key(x_admin_key: Optional[str] = Header(default=None)):
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"""FastAPI dependency: проверяет секретный ключ администратора (заголовок X-Admin-Key)."""
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admin_key = os.getenv("ADMIN_KEY", "")
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if not admin_key:
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raise HTTPException(
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status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
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detail="Admin access is disabled: ADMIN_KEY not configured",
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)
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if x_admin_key != admin_key:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Invalid admin key",
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)
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