auth.py

from datetime import datetime, timedelta, timezone
from jose import JWTError, jwt
from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from sqlalchemy.orm import Session
from . import crud, schemas, models, database
from .config import settings

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

def authenticate_user(db: Session, email: str, password: str):
    user = crud.get_user_by_email(db, email)
    if not user:
        return False
    if not crud.pwd_context.verify(password, user.hashed_password):
        return False
    return user

def create_access_token(data: dict, expires_delta: timedelta | None = None):
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.now(timezone.utc) + expires_delta
    else:
        expire = datetime.now(timezone.utc) + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, settings.JWT_SECRET_KEY, algorithm=settings.JWT_ALGORITHM)
    return encoded_jwt

def get_current_user(db: Session = Depends(database.get_db), token: str = Depends(oauth2_scheme)):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = jwt.decode(token, settings.JWT_SECRET_KEY, algorithms=[settings.JWT_ALGORITHM])
        email: str = payload.get("sub")
        if email is None:
            raise credentials_exception
        token_data = schemas.TokenData(email=email)
    except JWTError:
        raise credentials_exception
    user = crud.get_user_by_email(db, email=token_data.email)
    if user is None:
        raise credentials_exception
    return user

def get_current_active_user(current_user: models.User = Depends(get_current_user)):
    if current_user.role=='ADMIN':
        return current_user
    raise HTTPException(status_code=400, detail="Inactive user")

def get_current_admin(current_user: models.User = Depends(get_current_active_user)):
    if current_user.role=='ADMIN':
        return current_user
    raise HTTPException(status_code=400, detail="User does not have sufficient privileges")