80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
import os
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from datetime import datetime, timedelta, timezone
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from typing import Optional, Callable, Iterable
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from fastapi import Depends, 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 sqlalchemy.orm import Session
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from . import models
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from .database import get_db
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SECRET_KEY = os.getenv("SECRET_KEY", "dev-secret-change-me")
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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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# Use pbkdf2_sha256 to avoid external bcrypt backend issues
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pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/token")
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def verify_password(plain_password: str, password_hash: str) -> bool:
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return pwd_context.verify(plain_password, password_hash)
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def get_password_hash(password: str) -> str:
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return pwd_context.hash(password)
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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.update({"exp": expire})
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return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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def get_user_by_username(db: Session, username: str) -> Optional[models.User]:
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return db.query(models.User).filter(models.User.username == username).first()
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def authenticate_user(db: Session, username: str, password: str) -> Optional[models.User]:
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user = get_user_by_username(db, username)
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if not user:
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return None
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if not verify_password(password, user.password_hash):
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return None
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return user
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async def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)) -> models.User:
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credentials_exception = 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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username: str = payload.get("sub")
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if username is None:
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raise credentials_exception
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except JWTError:
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raise credentials_exception
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user = get_user_by_username(db, username=username)
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if user is None:
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raise credentials_exception
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return user
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def require_roles(allowed_roles: Iterable[str]) -> Callable[[models.User], models.User]:
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allowed = set(allowed_roles)
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def _dependency(user: models.User = Depends(get_current_user)) -> models.User:
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if user.role not in allowed:
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raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Insufficient permissions")
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return user
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return _dependency
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