felicity-lims/backend/felicity_lims/felicity/api/deps.py

from typing import AsyncGenerator, Generator

from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from jose import jwt
from pydantic import ValidationError
from sqlalchemy.orm import Session

from felicity.apps.user import crud, models, schemas
from felicity.core import security
from felicity.core.config import settings
from felicity.database.session import async_session_factory

reusable_oauth2 = OAuth2PasswordBearer(
    tokenUrl=f"{settings.API_V1_STR}/login/access-token"
)


async def get_db() -> AsyncGenerator:
    session = async_session_factory()
    try:
        yield session
        await session.commit()
    except async_session_factory as ex:
        await session.rollback()
        raise ex
    finally:
        await session.close()


def get_current_user(
    db: Session = Depends(get_db), token: str = Depends(reusable_oauth2)
) -> models.User:
    try:
        payload = jwt.decode(
            token, settings.SECRET_KEY, algorithms=[security.ALGORITHM]
        )
        token_data = schemas.TokenPayload(**payload)
    except (jwt.JWTError, ValidationError):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Could not validate credentials",
        )
    user = crud.user.get(db, id=token_data.sub)
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    return user


def get_current_active_user(
    current_user: models.User = Depends(get_current_user),
) -> models.User:
    if not crud.user.is_active(current_user):
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user


def get_current_active_superuser(
    current_user: models.User = Depends(get_current_user),
) -> models.User:
    if not crud.user.is_superuser(current_user):
        raise HTTPException(
            status_code=400, detail="The user doesn't have enough privileges"
        )
    return current_user