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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, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from jose import JWTError, jwt
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import bcrypt
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from .schemas import TokenData
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from .settings import settings
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from .models import User
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from .two_factor import verify_totp_code # Import verify_totp_code
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
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def verify_password(plain_password, hashed_password):
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password_bytes = plain_password[:72].encode("utf-8")
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hashed_bytes = (
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hashed_password.encode("utf-8")
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if isinstance(hashed_password, str)
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else hashed_password
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)
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return bcrypt.checkpw(password_bytes, hashed_bytes)
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def get_password_hash(password):
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password_bytes = password[:72].encode("utf-8")
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return bcrypt.hashpw(password_bytes, bcrypt.gensalt()).decode("utf-8")
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async def authenticate_user(
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username: str, password: str, two_factor_code: Optional[str] = None
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):
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user = await User.get_or_none(username=username)
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if not user:
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return None
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if not verify_password(password, user.hashed_password):
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return None
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if user.is_2fa_enabled:
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if not two_factor_code:
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return {"user": user, "2fa_required": True}
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if not verify_totp_code(user.two_factor_secret, two_factor_code):
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return None # 2FA code is incorrect
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return {"user": user, "2fa_required": False}
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def create_access_token(
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data: dict,
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expires_delta: Optional[timedelta] = None,
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two_factor_verified: bool = False,
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):
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.now(timezone.utc) + expires_delta
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else:
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expire = datetime.now(timezone.utc) + timedelta(
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minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
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)
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to_encode.update({"exp": expire, "2fa_verified": two_factor_verified})
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encoded_jwt = jwt.encode(
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to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM
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)
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return encoded_jwt
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async def get_current_user(token: str = Depends(oauth2_scheme)):
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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(
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token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
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)
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username: str = payload.get("sub")
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two_factor_verified: bool = payload.get("2fa_verified", False)
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if username is None:
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raise credentials_exception
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token_data = TokenData(
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username=username, two_factor_verified=two_factor_verified
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)
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except JWTError:
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raise credentials_exception
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user = await User.get_or_none(username=token_data.username)
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if user is None:
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raise credentials_exception
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user.token_data = token_data # Attach token_data to user for easy access
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return user
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async def get_current_active_user(current_user: User = Depends(get_current_user)):
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if not current_user.is_active:
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raise HTTPException(status_code=400, detail="Inactive user")
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return current_user
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async def get_current_verified_user(current_user: User = Depends(get_current_user)):
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if current_user.is_2fa_enabled and not current_user.token_data.two_factor_verified:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="2FA required and not verified",
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)
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return current_user
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async def get_current_admin_user(
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current_user: User = Depends(get_current_verified_user),
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):
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if not current_user.is_superuser:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN, detail="Not enough permissions"
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)
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return current_user
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